libreoffice/libreofficekit/source/gtk/lokdocview.cxx

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#include <sal/types.h>
#include <math.h>
#include <string.h>
#include <vector>
#include <string>
#include <boost/property_tree/json_parser.hpp>

#include <com/sun/star/awt/Key.hpp>
#define LOK_USE_UNSTABLE_API
#include <LibreOfficeKit/LibreOfficeKit.h>
#include <LibreOfficeKit/LibreOfficeKitInit.h>
#include <LibreOfficeKit/LibreOfficeKitEnums.h>
#include <LibreOfficeKit/LibreOfficeKitGtk.h>
#include <rsc/rsc-vcl-shared-types.hxx>
#include <vcl/event.hxx>

#include "tilebuffer.hxx"

#if !GLIB_CHECK_VERSION(2,32,0)
#define G_SOURCE_REMOVE FALSE
#define G_SOURCE_CONTINUE TRUE
#endif
#if !GLIB_CHECK_VERSION(2,40,0)
#define g_info(...) g_log(G_LOG_DOMAIN, G_LOG_LEVEL_INFO, __VA_ARGS__)
#endif

// Cursor bitmaps from the Android app.
#define CURSOR_HANDLE_DIR "/android/source/res/drawable/"
// Number of handles around a graphic selection.
#define GRAPHIC_HANDLE_COUNT 8

/// Private struct used by this GObject type
struct _LOKDocViewPrivate
{
    const gchar* m_aLOPath;
    const gchar* m_aDocPath;
    gdouble m_nLoadProgress;
    gboolean m_bIsLoading;
    gboolean m_bCanZoomIn;
    gboolean m_bCanZoomOut;
    LibreOfficeKit* m_pOffice;
    LibreOfficeKitDocument* m_pDocument;

    TileBuffer m_aTileBuffer;
    GThreadPool* lokThreadPool;

    gfloat m_fZoom;
    glong m_nDocumentWidthTwips;
    glong m_nDocumentHeightTwips;
    /// View or edit mode.
    gboolean m_bEdit;
    /// Position and size of the visible cursor.
    GdkRectangle m_aVisibleCursor;
    /// Cursor overlay is visible or hidden (for blinking).
    gboolean m_bCursorOverlayVisible;
    /// Cursor is visible or hidden (e.g. for graphic selection).
    gboolean m_bCursorVisible;
    /// Time of the last button press.
    guint32 m_nLastButtonPressTime;
    /// Time of the last button release.
    guint32 m_nLastButtonReleaseTime;
    /// Last pressed button (left, right, middle)
    guint32 m_nLastButtonPressed;
    /// Key modifier (ctrl, atl, shift)
    guint32 m_nKeyModifier;
    /// Rectangles of the current text selection.
    std::vector<GdkRectangle> m_aTextSelectionRectangles;
    /// Position and size of the selection start (as if there would be a cursor caret there).
    GdkRectangle m_aTextSelectionStart;
    /// Position and size of the selection end.
    GdkRectangle m_aTextSelectionEnd;
    GdkRectangle m_aGraphicSelection;
    gboolean m_bInDragGraphicSelection;

    /// @name Start/middle/end handle.
    ///@{
    /// Bitmap of the text selection start handle.
    cairo_surface_t* m_pHandleStart;
    /// Rectangle of the text selection start handle, to know if the user clicked on it or not
    GdkRectangle m_aHandleStartRect;
    /// If we are in the middle of a drag of the text selection end handle.
    gboolean m_bInDragStartHandle;
    /// Bitmap of the text selection middle handle.
    cairo_surface_t* m_pHandleMiddle;
    /// Rectangle of the text selection middle handle, to know if the user clicked on it or not
    GdkRectangle m_aHandleMiddleRect;
    /// If we are in the middle of a drag of the text selection middle handle.
    gboolean m_bInDragMiddleHandle;
    /// Bitmap of the text selection end handle.
    cairo_surface_t* m_pHandleEnd;
    /// Rectangle of the text selection end handle, to know if the user clicked on it or not
    GdkRectangle m_aHandleEndRect;
    /// If we are in the middle of a drag of the text selection end handle.
    gboolean m_bInDragEndHandle;
    ///@}

    /// @name Graphic handles.
    ///@{
    /// Bitmap of a graphic selection handle.
    cairo_surface_t* m_pGraphicHandle;
    /// Rectangle of a graphic selection handle, to know if the user clicked on it or not.
    GdkRectangle m_aGraphicHandleRects[8];
    /// If we are in the middle of a drag of a graphic selection handle.
    gboolean m_bInDragGraphicHandles[8];
    ///@}

    /// View ID, returned by createView() or 0 by default.
    int m_nViewId;
};

enum
{
    LOAD_CHANGED,
    EDIT_CHANGED,
    COMMAND_CHANGED,
    SEARCH_NOT_FOUND,
    PART_CHANGED,
    SIZE_CHANGED,
    HYPERLINK_CLICKED,
    CURSOR_CHANGED,
    SEARCH_RESULT_COUNT,

    LAST_SIGNAL
};

enum
{
    PROP_0,

    PROP_LO_PATH,
    PROP_LO_POINTER,
    PROP_DOC_PATH,
    PROP_DOC_POINTER,
    PROP_EDITABLE,
    PROP_LOAD_PROGRESS,
    PROP_ZOOM,
    PROP_IS_LOADING,
    PROP_DOC_WIDTH,
    PROP_DOC_HEIGHT,
    PROP_CAN_ZOOM_IN,
    PROP_CAN_ZOOM_OUT
};

static guint doc_view_signals[LAST_SIGNAL] = { 0 };

static void lok_doc_view_initable_iface_init (GInitableIface *iface);
static void callbackWorker (int nType, const char* pPayload, void* pData);

SAL_DLLPUBLIC_EXPORT GType lok_doc_view_get_type();
#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#endif
G_DEFINE_TYPE_WITH_CODE (LOKDocView, lok_doc_view, GTK_TYPE_DRAWING_AREA,
                         G_ADD_PRIVATE (LOKDocView)
                         G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, lok_doc_view_initable_iface_init));
#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif

/// Helper struct used to pass the data from soffice thread -> main thread.
struct CallbackData
{
    int m_nType;
    std::string m_aPayload;
    LOKDocView* m_pDocView;

    CallbackData(int nType, const std::string& rPayload, LOKDocView* pDocView)
        : m_nType(nType),
          m_aPayload(rPayload),
          m_pDocView(pDocView) {}
};

static void
payloadToSize(const char* pPayload, long& rWidth, long& rHeight)
{
    rWidth = rHeight = 0;
    gchar** ppCoordinates = g_strsplit(pPayload, ", ", 2);
    gchar** ppCoordinate = ppCoordinates;
    if (!*ppCoordinate)
        return;
    rWidth = atoi(*ppCoordinate);
    ++ppCoordinate;
    if (!*ppCoordinate)
        return;
    rHeight = atoi(*ppCoordinate);
    g_strfreev(ppCoordinates);
}

/// Returns the string representation of a LibreOfficeKitCallbackType enumeration element.
static const char*
callbackTypeToString (int nType)
{
    switch (nType)
    {
    case LOK_CALLBACK_INVALIDATE_TILES:
        return "LOK_CALLBACK_INVALIDATE_TILES";
    case LOK_CALLBACK_INVALIDATE_VISIBLE_CURSOR:
        return "LOK_CALLBACK_INVALIDATE_VISIBLE_CURSOR";
    case LOK_CALLBACK_TEXT_SELECTION:
        return "LOK_CALLBACK_TEXT_SELECTION";
    case LOK_CALLBACK_TEXT_SELECTION_START:
        return "LOK_CALLBACK_TEXT_SELECTION_START";
    case LOK_CALLBACK_TEXT_SELECTION_END:
        return "LOK_CALLBACK_TEXT_SELECTION_END";
    case LOK_CALLBACK_CURSOR_VISIBLE:
        return "LOK_CALLBACK_CURSOR_VISIBLE";
    case LOK_CALLBACK_GRAPHIC_SELECTION:
        return "LOK_CALLBACK_GRAPHIC_SELECTION";
    case LOK_CALLBACK_HYPERLINK_CLICKED:
        return "LOK_CALLBACK_HYPERLINK_CLICKED";
    case LOK_CALLBACK_STATE_CHANGED:
        return "LOK_CALLBACK_STATE_CHANGED";
    case LOK_CALLBACK_STATUS_INDICATOR_START:
        return "LOK_CALLBACK_STATUS_INDICATOR_START";
    case LOK_CALLBACK_STATUS_INDICATOR_SET_VALUE:
        return "LOK_CALLBACK_STATUS_INDICATOR_SET_VALUE";
    case LOK_CALLBACK_STATUS_INDICATOR_FINISH:
        return "LOK_CALLBACK_STATUS_INDICATOR_FINISH";
    case LOK_CALLBACK_SEARCH_NOT_FOUND:
        return "LOK_CALLBACK_SEARCH_NOT_FOUND";
    case LOK_CALLBACK_DOCUMENT_SIZE_CHANGED:
        return "LOK_CALLBACK_DOCUMENT_SIZE_CHANGED";
    case LOK_CALLBACK_SET_PART:
        return "LOK_CALLBACK_SET_PART";
    case LOK_CALLBACK_SEARCH_RESULT_SELECTION:
        return "LOK_CALLBACK_SEARCH_RESULT_SELECTION";
    }
    return 0;
}

static bool
isEmptyRectangle(const GdkRectangle& rRectangle)
{
    return rRectangle.x == 0 && rRectangle.y == 0 && rRectangle.width == 0 && rRectangle.height == 0;
}

static void
postKeyEventInThread(gpointer data)
{
    GTask* task = G_TASK(data);
    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));

    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
    priv->m_pDocument->pClass->postKeyEvent(priv->m_pDocument,
                                            pLOEvent->m_nKeyEvent,
                                            pLOEvent->m_nCharCode,
                                            pLOEvent->m_nKeyCode);
}

static gboolean
signalKey (GtkWidget* pWidget, GdkEventKey* pEvent)
{
    LOKDocView* pDocView = LOK_DOC_VIEW(pWidget);
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    int nCharCode = 0;
    int nKeyCode = 0;

    if (!priv->m_bEdit)
    {
        g_info("signalKey: not in edit mode, ignore");
        return FALSE;
    }

    priv->m_nKeyModifier = 0;
    switch (pEvent->keyval)
    {
    case GDK_KEY_BackSpace:
        nKeyCode = com::sun::star::awt::Key::BACKSPACE;
        break;
    case GDK_KEY_Delete:
        nKeyCode = com::sun::star::awt::Key::DELETE;
        break;
    case GDK_KEY_Return:
        nKeyCode = com::sun::star::awt::Key::RETURN;
        break;
    case GDK_KEY_Escape:
        nKeyCode = com::sun::star::awt::Key::ESCAPE;
        break;
    case GDK_KEY_Tab:
        nKeyCode = com::sun::star::awt::Key::TAB;
        break;
    case GDK_KEY_Down:
        nKeyCode = com::sun::star::awt::Key::DOWN;
        break;
    case GDK_KEY_Up:
        nKeyCode = com::sun::star::awt::Key::UP;
        break;
    case GDK_KEY_Left:
        nKeyCode = com::sun::star::awt::Key::LEFT;
        break;
    case GDK_KEY_Right:
        nKeyCode = com::sun::star::awt::Key::RIGHT;
        break;
    case GDK_KEY_Shift_L:
    case GDK_KEY_Shift_R:
        if (pEvent->type == GDK_KEY_PRESS)
            priv->m_nKeyModifier |= KEY_SHIFT;
        break;
    case GDK_KEY_Control_L:
    case GDK_KEY_Control_R:
        if (pEvent->type == GDK_KEY_PRESS)
            priv->m_nKeyModifier |= KEY_MOD1;
        break;
    case GDK_KEY_Alt_L:
    case GDK_KEY_Alt_R:
        if (pEvent->type == GDK_KEY_PRESS)
            priv->m_nKeyModifier |= KEY_MOD2;
        break;
    default:
        if (pEvent->keyval >= GDK_KEY_F1 && pEvent->keyval <= GDK_KEY_F26)
            nKeyCode = com::sun::star::awt::Key::F1 + (pEvent->keyval - GDK_KEY_F1);
        else
            nCharCode = gdk_keyval_to_unicode(pEvent->keyval);
    }

    // rsc is not public API, but should be good enough for debugging purposes.
    // If this is needed for real, then probably a new param of type
    // css::awt::KeyModifier is needed in postKeyEvent().
    if (pEvent->state & GDK_SHIFT_MASK)
        nKeyCode |= KEY_SHIFT;

    if (pEvent->type == GDK_KEY_RELEASE)
    {
        GTask* task = g_task_new(pDocView, NULL, NULL, NULL);
        LOEvent* pLOEvent = new LOEvent(LOK_POST_KEY);
        pLOEvent->m_nKeyEvent = LOK_KEYEVENT_KEYUP;
        pLOEvent->m_nCharCode = nCharCode;
        pLOEvent->m_nKeyCode  = nKeyCode;
        g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
        g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), NULL);
        g_object_unref(task);
    }
    else
    {
        GTask* task = g_task_new(pDocView, NULL, NULL, NULL);
        LOEvent* pLOEvent = new LOEvent(LOK_POST_KEY);
        pLOEvent->m_nKeyEvent = LOK_KEYEVENT_KEYINPUT;
        pLOEvent->m_nCharCode = nCharCode;
        pLOEvent->m_nKeyCode  = nKeyCode;
        g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
        g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), NULL);
        g_object_unref(task);
    }

    return FALSE;
}

static gboolean
handleTimeout (gpointer pData)
{
    LOKDocView* pDocView = LOK_DOC_VIEW (pData);
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));

    if (priv->m_bEdit)
    {
        if (priv->m_bCursorOverlayVisible)
            priv->m_bCursorOverlayVisible = false;
        else
            priv->m_bCursorOverlayVisible = true;
        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
    }

    return G_SOURCE_CONTINUE;
}

static void
commandChanged(LOKDocView* pDocView, const std::string& rString)
{
    g_signal_emit(pDocView, doc_view_signals[COMMAND_CHANGED], 0, rString.c_str());
}

static void
searchNotFound(LOKDocView* pDocView, const std::string& rString)
{
    g_signal_emit(pDocView, doc_view_signals[SEARCH_NOT_FOUND], 0, rString.c_str());
}

static void searchResultCount(LOKDocView* pDocView, const std::string& rString)
{
    g_signal_emit(pDocView, doc_view_signals[SEARCH_RESULT_COUNT], 0, rString.c_str());
}

static void
setPart(LOKDocView* pDocView, const std::string& rString)
{
    g_signal_emit(pDocView, doc_view_signals[PART_CHANGED], 0, std::stoi(rString));
}

static void
hyperlinkClicked(LOKDocView* pDocView, const std::string& rString)
{
    g_signal_emit(pDocView, doc_view_signals[HYPERLINK_CLICKED], 0, rString.c_str());
}

/// Trigger a redraw, invoked on the main thread by other functions running in a thread.
static gboolean queueDraw(gpointer pData)
{
    GtkWidget* pWidget = static_cast<GtkWidget*>(pData);

    gtk_widget_queue_draw(pWidget);

    return G_SOURCE_REMOVE;
}

/// Set up LOKDocView after the document is loaded, invoked on the main thread by openDocumentInThread() running in a thread.
static gboolean postDocumentLoad(gpointer pData)
{
    LOKDocView* pLOKDocView = static_cast<LOKDocView*>(pData);
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private(pLOKDocView));

    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
    priv->m_pDocument->pClass->initializeForRendering(priv->m_pDocument);
    priv->m_pDocument->pClass->registerCallback(priv->m_pDocument, callbackWorker, pLOKDocView);
    priv->m_pDocument->pClass->getDocumentSize(priv->m_pDocument, &priv->m_nDocumentWidthTwips, &priv->m_nDocumentHeightTwips);
    g_timeout_add(600, handleTimeout, pLOKDocView);

    float zoom = priv->m_fZoom;
    long nDocumentWidthTwips = priv->m_nDocumentWidthTwips;
    long nDocumentHeightTwips = priv->m_nDocumentHeightTwips;
    long nDocumentWidthPixels = twipToPixel(nDocumentWidthTwips, zoom);
    long nDocumentHeightPixels = twipToPixel(nDocumentHeightTwips, zoom);
    // Total number of columns in this document.
    guint nColumns = ceil((double)nDocumentWidthPixels / nTileSizePixels);


    priv->m_aTileBuffer = TileBuffer(priv->m_pDocument,
                                     nColumns);
    gtk_widget_set_size_request(GTK_WIDGET(pLOKDocView),
                                nDocumentWidthPixels,
                                nDocumentHeightPixels);
    gtk_widget_set_can_focus(GTK_WIDGET(pLOKDocView), TRUE);
    gtk_widget_grab_focus(GTK_WIDGET(pLOKDocView));

    return G_SOURCE_REMOVE;
}

/// Implementation of the global callback handler, invoked by globalCallback();
static gboolean
globalCallback (gpointer pData)
{
    CallbackData* pCallback = static_cast<CallbackData*>(pData);
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pCallback->m_pDocView));

    switch (pCallback->m_nType)
    {
    case LOK_CALLBACK_STATUS_INDICATOR_START:
    {
        priv->m_nLoadProgress = 0.0;
        g_signal_emit (pCallback->m_pDocView, doc_view_signals[LOAD_CHANGED], 0, 0.0);
    }
    break;
    case LOK_CALLBACK_STATUS_INDICATOR_SET_VALUE:
    {
        priv->m_nLoadProgress = static_cast<gdouble>(std::stoi(pCallback->m_aPayload)/100.0);
        g_signal_emit (pCallback->m_pDocView, doc_view_signals[LOAD_CHANGED], 0, priv->m_nLoadProgress);
    }
    break;
    case LOK_CALLBACK_STATUS_INDICATOR_FINISH:
    {
        priv->m_nLoadProgress = 1.0;
        g_signal_emit (pCallback->m_pDocView, doc_view_signals[LOAD_CHANGED], 0, 1.0);
    }
    break;
    default:
        g_assert(false);
        break;
    }
    delete pCallback;

    return G_SOURCE_REMOVE;
}

static void
globalCallbackWorker(int nType, const char* pPayload, void* pData)
{
    LOKDocView* pDocView = LOK_DOC_VIEW (pData);

    CallbackData* pCallback = new CallbackData(nType, pPayload ? pPayload : "(nil)", pDocView);
    g_info("LOKDocView_Impl::globalCallbackWorkerImpl: %s, '%s'", callbackTypeToString(nType), pPayload);
    gdk_threads_add_idle(globalCallback, pCallback);
}

static GdkRectangle
payloadToRectangle (LOKDocView* pDocView, const char* pPayload)
{
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    GdkRectangle aRet;
    gchar** ppCoordinates = g_strsplit(pPayload, ", ", 4);
    gchar** ppCoordinate = ppCoordinates;

    aRet.width = aRet.height = aRet.x = aRet.y = 0;

    if (!*ppCoordinate)
        return aRet;
    aRet.x = atoi(*ppCoordinate);
    if (aRet.x < 0)
        aRet.x = 0;
    ++ppCoordinate;
    if (!*ppCoordinate)
        return aRet;
    aRet.y = atoi(*ppCoordinate);
    if (aRet.y < 0)
        aRet.y = 0;
    ++ppCoordinate;
    if (!*ppCoordinate)
        return aRet;
    aRet.width = atoi(*ppCoordinate);
    if (aRet.x + aRet.width > priv->m_nDocumentWidthTwips)
        aRet.width = priv->m_nDocumentWidthTwips - aRet.x;
    ++ppCoordinate;
    if (!*ppCoordinate)
        return aRet;
    aRet.height = atoi(*ppCoordinate);
    if (aRet.y + aRet.height > priv->m_nDocumentHeightTwips)
        aRet.height = priv->m_nDocumentHeightTwips - aRet.y;
    g_strfreev(ppCoordinates);

    return aRet;
}

static const std::vector<GdkRectangle>
payloadToRectangles(LOKDocView* pDocView, const char* pPayload)
{
    std::vector<GdkRectangle> aRet;

    gchar** ppRectangles = g_strsplit(pPayload, "; ", 0);
    for (gchar** ppRectangle = ppRectangles; *ppRectangle; ++ppRectangle)
        aRet.push_back(payloadToRectangle(pDocView, *ppRectangle));
    g_strfreev(ppRectangles);

    return aRet;
}


static void
setTilesInvalid (LOKDocView* pDocView, const GdkRectangle& rRectangle)
{
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    GdkRectangle aRectanglePixels;
    GdkPoint aStart, aEnd;

    aRectanglePixels.x = twipToPixel(rRectangle.x, priv->m_fZoom);
    aRectanglePixels.y = twipToPixel(rRectangle.y, priv->m_fZoom);
    aRectanglePixels.width = twipToPixel(rRectangle.width, priv->m_fZoom);
    aRectanglePixels.height = twipToPixel(rRectangle.height, priv->m_fZoom);

    aStart.x = aRectanglePixels.y / nTileSizePixels;
    aStart.y = aRectanglePixels.x / nTileSizePixels;
    aEnd.x = (aRectanglePixels.y + aRectanglePixels.height + nTileSizePixels) / nTileSizePixels;
    aEnd.y = (aRectanglePixels.x + aRectanglePixels.width + nTileSizePixels) / nTileSizePixels;
    for (int i = aStart.x; i < aEnd.x; i++)
    {
        for (int j = aStart.y; j < aEnd.y; j++)
        {
            GTask* task = g_task_new(pDocView, NULL, NULL, NULL);
            priv->m_aTileBuffer.setInvalid(i, j, priv->m_fZoom, task, priv->lokThreadPool);
            g_object_unref(task);
        }
    }
}

static gboolean
callback (gpointer pData)
{
    CallbackData* pCallback = static_cast<CallbackData*>(pData);
    LOKDocView* pDocView = LOK_DOC_VIEW (pCallback->m_pDocView);
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));

    switch (pCallback->m_nType)
    {
    case LOK_CALLBACK_INVALIDATE_TILES:
    {
        if (pCallback->m_aPayload != "EMPTY")
        {
            GdkRectangle aRectangle = payloadToRectangle(pDocView, pCallback->m_aPayload.c_str());
            setTilesInvalid(pDocView, aRectangle);
        }
        else
            priv->m_aTileBuffer.resetAllTiles();

        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
    }
    break;
    case LOK_CALLBACK_INVALIDATE_VISIBLE_CURSOR:
    {
        priv->m_aVisibleCursor = payloadToRectangle(pDocView, pCallback->m_aPayload.c_str());
        priv->m_bCursorOverlayVisible = true;
        g_signal_emit(pDocView, doc_view_signals[CURSOR_CHANGED], 0,
                      priv->m_aVisibleCursor.x,
                      priv->m_aVisibleCursor.y,
                      priv->m_aVisibleCursor.width,
                      priv->m_aVisibleCursor.height);
        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
    }
    break;
    case LOK_CALLBACK_TEXT_SELECTION:
    {
        priv->m_aTextSelectionRectangles = payloadToRectangles(pDocView, pCallback->m_aPayload.c_str());
        // In case the selection is empty, then we get no LOK_CALLBACK_TEXT_SELECTION_START/END events.
        if (priv->m_aTextSelectionRectangles.empty())
        {
            memset(&priv->m_aTextSelectionStart, 0, sizeof(priv->m_aTextSelectionStart));
            memset(&priv->m_aHandleStartRect, 0, sizeof(priv->m_aHandleStartRect));
            memset(&priv->m_aTextSelectionEnd, 0, sizeof(priv->m_aTextSelectionEnd));
            memset(&priv->m_aHandleEndRect, 0, sizeof(priv->m_aHandleEndRect));
        }
        else
            memset(&priv->m_aHandleMiddleRect, 0, sizeof(priv->m_aHandleMiddleRect));
        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
    }
    break;
    case LOK_CALLBACK_TEXT_SELECTION_START:
    {
        priv->m_aTextSelectionStart = payloadToRectangle(pDocView, pCallback->m_aPayload.c_str());
    }
    break;
    case LOK_CALLBACK_TEXT_SELECTION_END:
    {
        priv->m_aTextSelectionEnd = payloadToRectangle(pDocView, pCallback->m_aPayload.c_str());
    }
    break;
    case LOK_CALLBACK_CURSOR_VISIBLE:
    {
        priv->m_bCursorVisible = pCallback->m_aPayload == "true";
    }
    break;
    case LOK_CALLBACK_GRAPHIC_SELECTION:
    {
        if (pCallback->m_aPayload != "EMPTY")
            priv->m_aGraphicSelection = payloadToRectangle(pDocView, pCallback->m_aPayload.c_str());
        else
            memset(&priv->m_aGraphicSelection, 0, sizeof(priv->m_aGraphicSelection));
        gtk_widget_queue_draw(GTK_WIDGET(pDocView));
    }
    break;
    case LOK_CALLBACK_HYPERLINK_CLICKED:
    {
        hyperlinkClicked(pDocView, pCallback->m_aPayload);
    }
    break;
    case LOK_CALLBACK_STATE_CHANGED:
    {
        commandChanged(pDocView, pCallback->m_aPayload);
    }
    break;
    case LOK_CALLBACK_SEARCH_NOT_FOUND:
    {
        searchNotFound(pDocView, pCallback->m_aPayload);
    }
    break;
    case LOK_CALLBACK_DOCUMENT_SIZE_CHANGED:
    {
        payloadToSize(pCallback->m_aPayload.c_str(), priv->m_nDocumentWidthTwips, priv->m_nDocumentHeightTwips);
        gtk_widget_set_size_request(GTK_WIDGET(pDocView),
                                    twipToPixel(priv->m_nDocumentWidthTwips, priv->m_fZoom),
                                    twipToPixel(priv->m_nDocumentHeightTwips, priv->m_fZoom));

        g_signal_emit(pDocView, doc_view_signals[SIZE_CHANGED], 0, NULL);
    }
    break;
    case LOK_CALLBACK_SET_PART:
    {
        setPart(pDocView, pCallback->m_aPayload);
    }
    break;
    case LOK_CALLBACK_SEARCH_RESULT_SELECTION:
    {
        boost::property_tree::ptree aTree;
        std::stringstream aStream(pCallback->m_aPayload);
        boost::property_tree::read_json(aStream, aTree);
        int nCount = aTree.get_child("searchResultSelection").size();
        searchResultCount(pDocView, std::to_string(nCount));
    }
    break;
    default:
        g_assert(false);
        break;
    }
    delete pCallback;

    return G_SOURCE_REMOVE;
}

static void callbackWorker (int nType, const char* pPayload, void* pData)
{
    LOKDocView* pDocView = LOK_DOC_VIEW (pData);

    CallbackData* pCallback = new CallbackData(nType, pPayload ? pPayload : "(nil)", pDocView);
    g_info("callbackWorker: %s, '%s'", callbackTypeToString(nType), pPayload);
    gdk_threads_add_idle(callback, pCallback);
}

static void
renderHandle(LOKDocView* pDocView,
             cairo_t* pCairo,
             const GdkRectangle& rCursor,
             cairo_surface_t* pHandle,
             GdkRectangle& rRectangle)
{
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    GdkPoint aCursorBottom;
    int nHandleWidth, nHandleHeight;
    double fHandleScale;

    nHandleWidth = cairo_image_surface_get_width(pHandle);
    nHandleHeight = cairo_image_surface_get_height(pHandle);
    // We want to scale down the handle, so that its height is the same as the cursor caret.
    fHandleScale = twipToPixel(rCursor.height, priv->m_fZoom) / nHandleHeight;
    // We want the top center of the handle bitmap to be at the bottom center of the cursor rectangle.
    aCursorBottom.x = twipToPixel(rCursor.x, priv->m_fZoom) + twipToPixel(rCursor.width, priv->m_fZoom) / 2 - (nHandleWidth * fHandleScale) / 2;
    aCursorBottom.y = twipToPixel(rCursor.y, priv->m_fZoom) + twipToPixel(rCursor.height, priv->m_fZoom);

    cairo_save (pCairo);
    cairo_translate(pCairo, aCursorBottom.x, aCursorBottom.y);
    cairo_scale(pCairo, fHandleScale, fHandleScale);
    cairo_set_source_surface(pCairo, pHandle, 0, 0);
    cairo_paint(pCairo);
    cairo_restore (pCairo);

    rRectangle.x = aCursorBottom.x;
    rRectangle.y = aCursorBottom.y;
    rRectangle.width = nHandleWidth * fHandleScale;
    rRectangle.height = nHandleHeight * fHandleScale;
}

/// Renders pHandle around an rSelection rectangle on pCairo.
static void
renderGraphicHandle(LOKDocView* pDocView,
                    cairo_t* pCairo,
                    const GdkRectangle& rSelection,
                    cairo_surface_t* pHandle)
{
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    int nHandleWidth, nHandleHeight;
    GdkRectangle aSelection;

    nHandleWidth = cairo_image_surface_get_width(pHandle);
    nHandleHeight = cairo_image_surface_get_height(pHandle);

    aSelection.x = twipToPixel(rSelection.x, priv->m_fZoom);
    aSelection.y = twipToPixel(rSelection.y, priv->m_fZoom);
    aSelection.width = twipToPixel(rSelection.width, priv->m_fZoom);
    aSelection.height = twipToPixel(rSelection.height, priv->m_fZoom);

    for (int i = 0; i < GRAPHIC_HANDLE_COUNT; ++i)
    {
        int x = aSelection.x, y = aSelection.y;

        switch (i)
        {
        case 0: // top-left
            break;
        case 1: // top-middle
            x += aSelection.width / 2;
            break;
        case 2: // top-right
            x += aSelection.width;
            break;
        case 3: // middle-left
            y += aSelection.height / 2;
            break;
        case 4: // middle-right
            x += aSelection.width;
            y += aSelection.height / 2;
            break;
        case 5: // bottom-left
            y += aSelection.height;
            break;
        case 6: // bottom-middle
            x += aSelection.width / 2;
            y += aSelection.height;
            break;
        case 7: // bottom-right
            x += aSelection.width;
            y += aSelection.height;
            break;
        }

        // Center the handle.
        x -= nHandleWidth / 2;
        y -= nHandleHeight / 2;

        priv->m_aGraphicHandleRects[i].x = x;
        priv->m_aGraphicHandleRects[i].y = y;
        priv->m_aGraphicHandleRects[i].width = nHandleWidth;
        priv->m_aGraphicHandleRects[i].height = nHandleHeight;

        cairo_save (pCairo);
        cairo_translate(pCairo, x, y);
        cairo_set_source_surface(pCairo, pHandle, 0, 0);
        cairo_paint(pCairo);
        cairo_restore (pCairo);
    }
}

static gboolean
renderDocument(LOKDocView* pDocView, cairo_t* pCairo)
{
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    GdkRectangle aVisibleArea;
    long nDocumentWidthPixels = twipToPixel(priv->m_nDocumentWidthTwips, priv->m_fZoom);
    long nDocumentHeightPixels = twipToPixel(priv->m_nDocumentHeightTwips, priv->m_fZoom);
    // Total number of rows / columns in this document.
    guint nRows = ceil((double)nDocumentHeightPixels / nTileSizePixels);
    guint nColumns = ceil((double)nDocumentWidthPixels / nTileSizePixels);

    gdk_cairo_get_clip_rectangle (pCairo, &aVisibleArea);
    aVisibleArea.x = pixelToTwip (aVisibleArea.x, priv->m_fZoom);
    aVisibleArea.y = pixelToTwip (aVisibleArea.y, priv->m_fZoom);
    aVisibleArea.width = pixelToTwip (aVisibleArea.width, priv->m_fZoom);
    aVisibleArea.height = pixelToTwip (aVisibleArea.height, priv->m_fZoom);

    // Render the tiles.
    for (guint nRow = 0; nRow < nRows; ++nRow)
    {
        for (guint nColumn = 0; nColumn < nColumns; ++nColumn)
        {
            GdkRectangle aTileRectangleTwips, aTileRectanglePixels;
            bool bPaint = true;

            // Determine size of the tile: the rightmost/bottommost tiles may
            // be smaller, and we need the size to decide if we need to repaint.
            if (nColumn == nColumns - 1)
                aTileRectanglePixels.width = nDocumentWidthPixels - nColumn * nTileSizePixels;
            else
                aTileRectanglePixels.width = nTileSizePixels;
            if (nRow == nRows - 1)
                aTileRectanglePixels.height = nDocumentHeightPixels - nRow * nTileSizePixels;
            else
                aTileRectanglePixels.height = nTileSizePixels;

            // Determine size and position of the tile in document coordinates,
            // so we can decide if we can skip painting for partial rendering.
            aTileRectangleTwips.x = pixelToTwip(nTileSizePixels, priv->m_fZoom) * nColumn;
            aTileRectangleTwips.y = pixelToTwip(nTileSizePixels, priv->m_fZoom) * nRow;
            aTileRectangleTwips.width = pixelToTwip(aTileRectanglePixels.width, priv->m_fZoom);
            aTileRectangleTwips.height = pixelToTwip(aTileRectanglePixels.height, priv->m_fZoom);

            if (!gdk_rectangle_intersect(&aVisibleArea, &aTileRectangleTwips, 0))
                bPaint = false;

            if (bPaint)
            {
                GTask* task = g_task_new(pDocView, NULL, NULL, NULL);
                Tile& currentTile = priv->m_aTileBuffer.getTile(nRow, nColumn, priv->m_fZoom, task, priv->lokThreadPool);
                GdkPixbuf* pPixBuf = currentTile.getBuffer();
                gdk_cairo_set_source_pixbuf (pCairo, pPixBuf,
                                             twipToPixel(aTileRectangleTwips.x, priv->m_fZoom),
                                             twipToPixel(aTileRectangleTwips.y, priv->m_fZoom));
                cairo_paint(pCairo);
                g_object_unref(task);
            }
        }
    }

    return FALSE;
}

static gboolean
renderOverlay(LOKDocView* pDocView, cairo_t* pCairo)
{
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));

    if (priv->m_bEdit && priv->m_bCursorVisible && priv->m_bCursorOverlayVisible && !isEmptyRectangle(priv->m_aVisibleCursor))
    {
        if (priv->m_aVisibleCursor.width < 30)
            // Set a minimal width if it would be 0.
            priv->m_aVisibleCursor.width = 30;

        cairo_set_source_rgb(pCairo, 0, 0, 0);
        cairo_rectangle(pCairo,
                        twipToPixel(priv->m_aVisibleCursor.x, priv->m_fZoom),
                        twipToPixel(priv->m_aVisibleCursor.y, priv->m_fZoom),
                        twipToPixel(priv->m_aVisibleCursor.width, priv->m_fZoom),
                        twipToPixel(priv->m_aVisibleCursor.height, priv->m_fZoom));
        cairo_fill(pCairo);
    }

    if (priv->m_bEdit && priv->m_bCursorVisible && !isEmptyRectangle(priv->m_aVisibleCursor) && priv->m_aTextSelectionRectangles.empty())
    {
        // Have a cursor, but no selection: we need the middle handle.
        gchar* handleMiddlePath = g_strconcat (priv->m_aLOPath, "/../..", CURSOR_HANDLE_DIR, "handle_middle.png", NULL);
        if (!priv->m_pHandleMiddle)
            priv->m_pHandleMiddle = cairo_image_surface_create_from_png(handleMiddlePath);
        g_free (handleMiddlePath);
        renderHandle(pDocView, pCairo, priv->m_aVisibleCursor, priv->m_pHandleMiddle, priv->m_aHandleMiddleRect);
    }

    if (!priv->m_aTextSelectionRectangles.empty())
    {
        for (GdkRectangle& rRectangle : priv->m_aTextSelectionRectangles)
        {
            // Blue with 75% transparency.
            cairo_set_source_rgba(pCairo, ((double)0x43)/255, ((double)0xac)/255, ((double)0xe8)/255, 0.25);
            cairo_rectangle(pCairo,
                            twipToPixel(rRectangle.x, priv->m_fZoom),
                            twipToPixel(rRectangle.y, priv->m_fZoom),
                            twipToPixel(rRectangle.width, priv->m_fZoom),
                            twipToPixel(rRectangle.height, priv->m_fZoom));
            cairo_fill(pCairo);
        }

        // Handles
        if (!isEmptyRectangle(priv->m_aTextSelectionStart))
        {
            // Have a start position: we need a start handle.
            gchar* handleStartPath = g_strconcat (priv->m_aLOPath, "/../..", CURSOR_HANDLE_DIR, "handle_start.png", NULL);
            if (!priv->m_pHandleStart)
                priv->m_pHandleStart = cairo_image_surface_create_from_png(handleStartPath);
            renderHandle(pDocView, pCairo, priv->m_aTextSelectionStart, priv->m_pHandleStart, priv->m_aHandleStartRect);
            g_free (handleStartPath);
        }
        if (!isEmptyRectangle(priv->m_aTextSelectionEnd))
        {
            // Have a start position: we need an end handle.
            gchar* handleEndPath = g_strconcat (priv->m_aLOPath, "/../..", CURSOR_HANDLE_DIR, "handle_end.png", NULL);
            if (!priv->m_pHandleEnd)
                priv->m_pHandleEnd = cairo_image_surface_create_from_png(handleEndPath);
            renderHandle(pDocView, pCairo, priv->m_aTextSelectionEnd, priv->m_pHandleEnd, priv->m_aHandleEndRect);
            g_free (handleEndPath);
        }
    }

    if (!isEmptyRectangle(priv->m_aGraphicSelection))
    {
        gchar* handleGraphicPath = g_strconcat (priv->m_aLOPath, "/../..", CURSOR_HANDLE_DIR, "handle_graphic.png", NULL);
        if (!priv->m_pGraphicHandle)
            priv->m_pGraphicHandle = cairo_image_surface_create_from_png(handleGraphicPath);
        renderGraphicHandle(pDocView, pCairo, priv->m_aGraphicSelection, priv->m_pGraphicHandle);
        g_free (handleGraphicPath);
    }

    return FALSE;
}

static gboolean
lok_doc_view_signal_button(GtkWidget* pWidget, GdkEventButton* pEvent)
{
    LOKDocView* pDocView = LOK_DOC_VIEW (pWidget);
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));

    g_info("LOKDocView_Impl::signalButton: %d, %d (in twips: %d, %d)",
           (int)pEvent->x, (int)pEvent->y,
           (int)pixelToTwip(pEvent->x, priv->m_fZoom),
           (int)pixelToTwip(pEvent->y, priv->m_fZoom));
    gtk_widget_grab_focus(GTK_WIDGET(pDocView));

    if (pEvent->type == GDK_BUTTON_RELEASE)
    {
        if (priv->m_bInDragStartHandle)
        {
            g_info("LOKDocView_Impl::signalButton: end of drag start handle");
            priv->m_bInDragStartHandle = false;
            return FALSE;
        }
        else if (priv->m_bInDragMiddleHandle)
        {
            g_info("LOKDocView_Impl::signalButton: end of drag middle handle");
            priv->m_bInDragMiddleHandle = false;
            return FALSE;
        }
        else if (priv->m_bInDragEndHandle)
        {
            g_info("LOKDocView_Impl::signalButton: end of drag end handle");
            priv->m_bInDragEndHandle = false;
            return FALSE;
        }

        for (int i = 0; i < GRAPHIC_HANDLE_COUNT; ++i)
        {
            if (priv->m_bInDragGraphicHandles[i])
            {
                g_info("LOKDocView_Impl::signalButton: end of drag graphic handle #%d", i);
                priv->m_bInDragGraphicHandles[i] = false;

                GTask* task = g_task_new(pDocView, NULL, NULL, NULL);
                LOEvent* pLOEvent = new LOEvent(LOK_SET_GRAPHIC_SELECTION);
                pLOEvent->m_nSetGraphicSelectionType = LOK_SETGRAPHICSELECTION_END;
                pLOEvent->m_nSetGraphicSelectionX = pixelToTwip(pEvent->x, priv->m_fZoom);
                pLOEvent->m_nSetGraphicSelectionY = pixelToTwip(pEvent->y, priv->m_fZoom);
                g_task_set_task_data(task, pLOEvent, LOEvent::destroy);

                g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), NULL);
                g_object_unref(task);

                return FALSE;
            }
        }

        if (priv->m_bInDragGraphicSelection)
        {
            g_info("LOKDocView_Impl::signalButton: end of drag graphic selection");
            priv->m_bInDragGraphicSelection = false;

            GTask* task = g_task_new(pDocView, NULL, NULL, NULL);
            LOEvent* pLOEvent = new LOEvent(LOK_SET_GRAPHIC_SELECTION);
            pLOEvent->m_nSetGraphicSelectionType = LOK_SETGRAPHICSELECTION_END;
            pLOEvent->m_nSetGraphicSelectionX = pixelToTwip(pEvent->x, priv->m_fZoom);
            pLOEvent->m_nSetGraphicSelectionY = pixelToTwip(pEvent->y, priv->m_fZoom);
            g_task_set_task_data(task, pLOEvent, LOEvent::destroy);

            g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), NULL);
            g_object_unref(task);

            return FALSE;
        }
    }

    if (priv->m_bEdit)
    {
        GdkRectangle aClick;
        aClick.x = pEvent->x;
        aClick.y = pEvent->y;
        aClick.width = 1;
        aClick.height = 1;
        if (pEvent->type == GDK_BUTTON_PRESS)
        {
            if (gdk_rectangle_intersect(&aClick, &priv->m_aHandleStartRect, NULL))
            {
                g_info("LOKDocView_Impl::signalButton: start of drag start handle");
                priv->m_bInDragStartHandle = true;
                return FALSE;
            }
            else if (gdk_rectangle_intersect(&aClick, &priv->m_aHandleMiddleRect, NULL))
            {
                g_info("LOKDocView_Impl::signalButton: start of drag middle handle");
                priv->m_bInDragMiddleHandle = true;
                return FALSE;
            }
            else if (gdk_rectangle_intersect(&aClick, &priv->m_aHandleEndRect, NULL))
            {
                g_info("LOKDocView_Impl::signalButton: start of drag end handle");
                priv->m_bInDragEndHandle = true;
                return FALSE;
            }

            for (int i = 0; i < GRAPHIC_HANDLE_COUNT; ++i)
            {
                if (gdk_rectangle_intersect(&aClick, &priv->m_aGraphicHandleRects[i], NULL))
                {
                    g_info("LOKDocView_Impl::signalButton: start of drag graphic handle #%d", i);
                    priv->m_bInDragGraphicHandles[i] = true;

                    GTask* task = g_task_new(pDocView, NULL, NULL, NULL);
                    LOEvent* pLOEvent = new LOEvent(LOK_SET_GRAPHIC_SELECTION);
                    pLOEvent->m_nSetGraphicSelectionType = LOK_SETGRAPHICSELECTION_START;
                    pLOEvent->m_nSetGraphicSelectionX = pixelToTwip(priv->m_aGraphicHandleRects[i].x + priv->m_aGraphicHandleRects[i].width / 2, priv->m_fZoom);
                    pLOEvent->m_nSetGraphicSelectionY = pixelToTwip(priv->m_aGraphicHandleRects[i].y + priv->m_aGraphicHandleRects[i].height / 2, priv->m_fZoom);
                    g_task_set_task_data(task, pLOEvent, LOEvent::destroy);

                    g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), NULL);
                    g_object_unref(task);

                    return FALSE;
                }
            }
        }
    }

    if (!priv->m_bEdit)
        lok_doc_view_set_edit(pDocView, TRUE);

    switch (pEvent->type)
    {
    case GDK_BUTTON_PRESS:
    {
        int nCount = 1;
        if ((pEvent->time - priv->m_nLastButtonPressTime) < 250)
            nCount++;
        priv->m_nLastButtonPressTime = pEvent->time;
        GTask* task = g_task_new(pDocView, NULL, NULL, NULL);
        LOEvent* pLOEvent = new LOEvent(LOK_POST_MOUSE_EVENT);
        pLOEvent->m_nPostMouseEventType = LOK_MOUSEEVENT_MOUSEBUTTONDOWN;
        pLOEvent->m_nPostMouseEventX = pixelToTwip(pEvent->x, priv->m_fZoom);
        pLOEvent->m_nPostMouseEventY = pixelToTwip(pEvent->y, priv->m_fZoom);
        pLOEvent->m_nPostMouseEventCount = nCount;
        switch (pEvent->button)
        {
        case 1:
            pLOEvent->m_nPostMouseEventButton = MOUSE_LEFT;
            break;
        case 2:
            pLOEvent->m_nPostMouseEventButton = MOUSE_MIDDLE;
            break;
        case 3:
            pLOEvent->m_nPostMouseEventButton = MOUSE_RIGHT;
            break;
        }
        pLOEvent->m_nPostMouseEventModifier = priv->m_nKeyModifier;
        priv->m_nLastButtonPressed = pLOEvent->m_nPostMouseEventButton;
        g_task_set_task_data(task, pLOEvent, LOEvent::destroy);

        g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), NULL);
        g_object_unref(task);
        break;
    }
    case GDK_BUTTON_RELEASE:
    {
        int nCount = 1;
        if ((pEvent->time - priv->m_nLastButtonReleaseTime) < 250)
            nCount++;
        priv->m_nLastButtonReleaseTime = pEvent->time;
        GTask* task = g_task_new(pDocView, NULL, NULL, NULL);
        LOEvent* pLOEvent = new LOEvent(LOK_POST_MOUSE_EVENT);
        pLOEvent->m_nPostMouseEventType = LOK_MOUSEEVENT_MOUSEBUTTONUP;
        pLOEvent->m_nPostMouseEventX = pixelToTwip(pEvent->x, priv->m_fZoom);
        pLOEvent->m_nPostMouseEventY = pixelToTwip(pEvent->y, priv->m_fZoom);
        pLOEvent->m_nPostMouseEventCount = nCount;
        switch (pEvent->button)
        {
        case 1:
            pLOEvent->m_nPostMouseEventButton = MOUSE_LEFT;
            break;
        case 2:
            pLOEvent->m_nPostMouseEventButton = MOUSE_MIDDLE;
            break;
        case 3:
            pLOEvent->m_nPostMouseEventButton = MOUSE_RIGHT;
            break;
        }
        pLOEvent->m_nPostMouseEventModifier = priv->m_nKeyModifier;
        priv->m_nLastButtonPressed = pLOEvent->m_nPostMouseEventButton;
        g_task_set_task_data(task, pLOEvent, LOEvent::destroy);

        g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), NULL);
        g_object_unref(task);
        break;
    }
    default:
        break;
    }
    return FALSE;
}

static void
getDragPoint(GdkRectangle* pHandle,
             GdkEventMotion* pEvent,
             GdkPoint* pPoint)
{
    GdkPoint aCursor, aHandle;

    // Center of the cursor rectangle: we know that it's above the handle.
    aCursor.x = pHandle->x + pHandle->width / 2;
    aCursor.y = pHandle->y - pHandle->height / 2;
    // Center of the handle rectangle.
    aHandle.x = pHandle->x + pHandle->width / 2;
    aHandle.y = pHandle->y + pHandle->height / 2;
    // Our target is the original cursor position + the dragged offset.
    pPoint->x = aCursor.x + (pEvent->x - aHandle.x);
    pPoint->y = aCursor.y + (pEvent->y - aHandle.y);
}

static gboolean
lok_doc_view_signal_motion (GtkWidget* pWidget, GdkEventMotion* pEvent)
{
    LOKDocView* pDocView = LOK_DOC_VIEW (pWidget);
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    GdkPoint aPoint;

    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
    if (priv->m_bInDragMiddleHandle)
    {
        g_info("lcl_signalMotion: dragging the middle handle");
        getDragPoint(&priv->m_aHandleMiddleRect, pEvent, &aPoint);
        priv->m_pDocument->pClass->setTextSelection(priv->m_pDocument, LOK_SETTEXTSELECTION_RESET, pixelToTwip(aPoint.x, priv->m_fZoom), pixelToTwip(aPoint.y, priv->m_fZoom));
        return FALSE;
    }
    if (priv->m_bInDragStartHandle)
    {
        g_info("lcl_signalMotion: dragging the start handle");
        getDragPoint(&priv->m_aHandleStartRect, pEvent, &aPoint);
        priv->m_pDocument->pClass->setTextSelection(priv->m_pDocument, LOK_SETTEXTSELECTION_START, pixelToTwip(aPoint.x, priv->m_fZoom), pixelToTwip(aPoint.y, priv->m_fZoom));
        return FALSE;
    }
    if (priv->m_bInDragEndHandle)
    {
        g_info("lcl_signalMotion: dragging the end handle");
        getDragPoint(&priv->m_aHandleEndRect, pEvent, &aPoint);
        priv->m_pDocument->pClass->setTextSelection(priv->m_pDocument, LOK_SETTEXTSELECTION_END, pixelToTwip(aPoint.x, priv->m_fZoom), pixelToTwip(aPoint.y, priv->m_fZoom));
        return FALSE;
    }
    for (int i = 0; i < GRAPHIC_HANDLE_COUNT; ++i)
    {
        if (priv->m_bInDragGraphicHandles[i])
        {
            g_info("lcl_signalMotion: dragging the graphic handle #%d", i);
            return FALSE;
        }
    }
    if (priv->m_bInDragGraphicSelection)
    {
        g_info("lcl_signalMotion: dragging the graphic selection");
        return FALSE;
    }

    GdkRectangle aMotionInTwipsInTwips;
    aMotionInTwipsInTwips.x = pixelToTwip(pEvent->x, priv->m_fZoom);
    aMotionInTwipsInTwips.y = pixelToTwip(pEvent->y, priv->m_fZoom);
    aMotionInTwipsInTwips.width = 1;
    aMotionInTwipsInTwips.height = 1;
    if (gdk_rectangle_intersect(&aMotionInTwipsInTwips, &priv->m_aGraphicSelection, 0))
    {
        g_info("lcl_signalMotion: start of drag graphic selection");
        priv->m_bInDragGraphicSelection = true;

        GTask* task = g_task_new(pDocView, NULL, NULL, NULL);
        LOEvent* pLOEvent = new LOEvent(LOK_SET_GRAPHIC_SELECTION);
        pLOEvent->m_nSetGraphicSelectionType = LOK_SETGRAPHICSELECTION_START;
        pLOEvent->m_nSetGraphicSelectionX = pixelToTwip(pEvent->x, priv->m_fZoom);
        pLOEvent->m_nSetGraphicSelectionY = pixelToTwip(pEvent->y, priv->m_fZoom);
        g_task_set_task_data(task, pLOEvent, LOEvent::destroy);

        g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), NULL);
        g_object_unref(task);

        return FALSE;
    }

    // Otherwise a mouse move, as on the desktop.

    GTask* task = g_task_new(pDocView, NULL, NULL, NULL);
    LOEvent* pLOEvent = new LOEvent(LOK_POST_MOUSE_EVENT);
    pLOEvent->m_nPostMouseEventType = LOK_MOUSEEVENT_MOUSEMOVE;
    pLOEvent->m_nPostMouseEventX = pixelToTwip(pEvent->x, priv->m_fZoom);
    pLOEvent->m_nPostMouseEventY = pixelToTwip(pEvent->y, priv->m_fZoom);
    pLOEvent->m_nPostMouseEventCount = 1;
    pLOEvent->m_nPostMouseEventButton = priv->m_nLastButtonPressed;
    pLOEvent->m_nPostMouseEventModifier = priv->m_nKeyModifier;

    g_task_set_task_data(task, pLOEvent, LOEvent::destroy);

    g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), NULL);
    g_object_unref(task);

    return FALSE;
}

static void
setGraphicSelectionInThread(gpointer data)
{
    GTask* task = G_TASK(data);
    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));

    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
    priv->m_pDocument->pClass->setGraphicSelection(priv->m_pDocument,
                                                   pLOEvent->m_nSetGraphicSelectionType,
                                                   pLOEvent->m_nSetGraphicSelectionX,
                                                   pLOEvent->m_nSetGraphicSelectionY);
}

static void
postMouseEventInThread(gpointer data)
{
    GTask* task = G_TASK(data);
    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));

    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
    priv->m_pDocument->pClass->postMouseEvent(priv->m_pDocument,
                                              pLOEvent->m_nPostMouseEventType,
                                              pLOEvent->m_nPostMouseEventX,
                                              pLOEvent->m_nPostMouseEventY,
                                              pLOEvent->m_nPostMouseEventCount,
                                              pLOEvent->m_nPostMouseEventButton,
                                              pLOEvent->m_nPostMouseEventModifier);
}

static void
openDocumentInThread (gpointer data)
{
    GTask* task = G_TASK(data);
    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));

    if ( priv->m_pDocument )
    {
        priv->m_pDocument->pClass->destroy( priv->m_pDocument );
        priv->m_pDocument = 0;
    }

    priv->m_pOffice->pClass->registerCallback(priv->m_pOffice, globalCallbackWorker, pDocView);
    priv->m_pDocument = priv->m_pOffice->pClass->documentLoad( priv->m_pOffice, priv->m_aDocPath );
    if ( !priv->m_pDocument )
    {
        char *pError = priv->m_pOffice->pClass->getError( priv->m_pOffice );
        g_task_return_new_error(task, 0, 0, "%s", pError);
    }
    else
    {
        gdk_threads_add_idle(postDocumentLoad, pDocView);
        g_task_return_boolean (task, true);
    }
}

static void
setPartInThread(gpointer data)
{
    GTask* task = G_TASK(data);
    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));
    int nPart = pLOEvent->m_nPart;

    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
    priv->m_pDocument->pClass->setPart( priv->m_pDocument, nPart );
}

static void
setPartmodeInThread(gpointer data)
{
    GTask* task = G_TASK(data);
    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));
    int nPartMode = pLOEvent->m_nPartMode;

    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
    priv->m_pDocument->pClass->setPartMode( priv->m_pDocument, nPartMode );
}

static void
setEditInThread(gpointer data)
{
    GTask* task = G_TASK(data);
    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));
    gboolean bWasEdit = priv->m_bEdit;
    gboolean bEdit = pLOEvent->m_bEdit;

    if (!priv->m_bEdit && bEdit)
        g_info("lok_doc_view_set_edit: entering edit mode");
    else if (priv->m_bEdit && !bEdit)
    {
        g_info("lok_doc_view_set_edit: leaving edit mode");
        priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
        priv->m_pDocument->pClass->resetSelection(priv->m_pDocument);
    }
    priv->m_bEdit = bEdit;
    g_signal_emit(pDocView, doc_view_signals[EDIT_CHANGED], 0, bWasEdit);
    gdk_threads_add_idle(queueDraw, GTK_WIDGET(pDocView));
}

static void
postCommandInThread (gpointer data)
{
    GTask* task = G_TASK(data);
    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));

    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
    std::stringstream ss;
    ss << "lok::Document::postUnoCommand(" << pLOEvent->m_pCommand << ", " << pLOEvent->m_pArguments << ")";
    g_info(ss.str().c_str());
    priv->m_pDocument->pClass->postUnoCommand(priv->m_pDocument, pLOEvent->m_pCommand, pLOEvent->m_pArguments);
}

static void
paintTileInThread (gpointer data)
{
    GTask* task = G_TASK(data);
    LOKDocView* pDocView = LOK_DOC_VIEW(g_task_get_source_object(task));
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));
    TileBuffer& buffer = priv->m_aTileBuffer;
    int index = pLOEvent->m_nPaintTileX * buffer.m_nWidth + pLOEvent->m_nPaintTileY;
    if (buffer.m_mTiles.find(index) != buffer.m_mTiles.end() &&
        buffer.m_mTiles[index].valid)
        return;

    GdkPixbuf* pPixBuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8, nTileSizePixels, nTileSizePixels);
    if (!pPixBuf)
    {
        g_info ("Error allocating memory to pixbuf");
        return;
    }

    unsigned char* pBuffer = gdk_pixbuf_get_pixels(pPixBuf);
    GdkRectangle aTileRectangle;
    aTileRectangle.x = pixelToTwip(nTileSizePixels, pLOEvent->m_fPaintTileZoom) * pLOEvent->m_nPaintTileY;
    aTileRectangle.y = pixelToTwip(nTileSizePixels, pLOEvent->m_fPaintTileZoom) * pLOEvent->m_nPaintTileX;

    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
    std::stringstream ss;
    ss << "lok::Document::paintTile(" << static_cast<void*>(pBuffer) << ", "
        << nTileSizePixels << ", " << nTileSizePixels << ", "
        << aTileRectangle.x << ", " << aTileRectangle.y << ", "
        << pixelToTwip(nTileSizePixels, pLOEvent->m_fPaintTileZoom) << ", "
        << pixelToTwip(nTileSizePixels, pLOEvent->m_fPaintTileZoom) << ")";
    g_info(ss.str().c_str());
    priv->m_pDocument->pClass->paintTile(priv->m_pDocument,
                                         pBuffer,
                                         nTileSizePixels, nTileSizePixels,
                                         aTileRectangle.x, aTileRectangle.y,
                                         pixelToTwip(nTileSizePixels, pLOEvent->m_fPaintTileZoom),
                                         pixelToTwip(nTileSizePixels, pLOEvent->m_fPaintTileZoom));

    //create a mapping for it
    buffer.m_mTiles[index].setPixbuf(pPixBuf);
    buffer.m_mTiles[index].valid = true;
    gdk_threads_add_idle(queueDraw, GTK_WIDGET(pDocView));
}


static void
lokThreadFunc(gpointer data, gpointer /*user_data*/)
{
    GTask* task = G_TASK(data);
    LOEvent* pLOEvent = static_cast<LOEvent*>(g_task_get_task_data(task));

    switch (pLOEvent->m_nType)
    {
    case LOK_LOAD_DOC:
        openDocumentInThread(task);
        break;
    case LOK_POST_COMMAND:
        postCommandInThread(task);
        break;
    case LOK_SET_EDIT:
        setEditInThread(task);
        break;
    case LOK_SET_PART:
        setPartInThread(task);
        break;
    case LOK_SET_PARTMODE:
        setPartmodeInThread(task);
        break;
    case LOK_POST_KEY:
        postKeyEventInThread(task);
        break;
    case LOK_PAINT_TILE:
        paintTileInThread(task);
        break;
    case LOK_POST_MOUSE_EVENT:
        postMouseEventInThread(task);
        break;
    case LOK_SET_GRAPHIC_SELECTION:
        setGraphicSelectionInThread(task);
        break;
    }

    g_object_unref(task);
}

static void lok_doc_view_init (LOKDocView* pDocView)
{
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    priv->m_bCursorVisible = true;

    gtk_widget_add_events(GTK_WIDGET(pDocView),
                          GDK_BUTTON_PRESS_MASK
                          |GDK_BUTTON_RELEASE_MASK
                          |GDK_BUTTON_MOTION_MASK
                          |GDK_KEY_PRESS_MASK
                          |GDK_KEY_RELEASE_MASK);

    priv->lokThreadPool = g_thread_pool_new(lokThreadFunc,
                                            NULL,
                                            1,
                                            FALSE,
                                            NULL);
}

static void lok_doc_view_set_property (GObject* object, guint propId, const GValue *value, GParamSpec *pspec)
{
    LOKDocView* pDocView = LOK_DOC_VIEW (object);
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));

    switch (propId)
    {
    case PROP_LO_PATH:
        priv->m_aLOPath = g_value_dup_string (value);
        break;
    case PROP_LO_POINTER:
        priv->m_pOffice = static_cast<LibreOfficeKit*>(g_value_get_pointer(value));
        break;
    case PROP_DOC_PATH:
        priv->m_aDocPath = g_value_dup_string (value);
        break;
    case PROP_DOC_POINTER:
        priv->m_pDocument = static_cast<LibreOfficeKitDocument*>(g_value_get_pointer(value));
        break;
    case PROP_EDITABLE:
        lok_doc_view_set_edit (pDocView, g_value_get_boolean (value));
        break;
    case PROP_ZOOM:
        lok_doc_view_set_zoom (pDocView, g_value_get_float (value));
        break;
    case PROP_DOC_WIDTH:
        priv->m_nDocumentWidthTwips = g_value_get_long (value);
        break;
    case PROP_DOC_HEIGHT:
        priv->m_nDocumentHeightTwips = g_value_get_long (value);
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, propId, pspec);
    }
}

static void lok_doc_view_get_property (GObject* object, guint propId, GValue *value, GParamSpec *pspec)
{
    LOKDocView* pDocView = LOK_DOC_VIEW (object);
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));

    switch (propId)
    {
    case PROP_LO_PATH:
        g_value_set_string (value, priv->m_aLOPath);
        break;
    case PROP_LO_POINTER:
        g_value_set_pointer(value, priv->m_pOffice);
        break;
    case PROP_DOC_PATH:
        g_value_set_string (value, priv->m_aDocPath);
        break;
    case PROP_DOC_POINTER:
        g_value_set_pointer(value, priv->m_pDocument);
        break;
    case PROP_EDITABLE:
        g_value_set_boolean (value, priv->m_bEdit);
        break;
    case PROP_LOAD_PROGRESS:
        g_value_set_double (value, priv->m_nLoadProgress);
        break;
    case PROP_ZOOM:
        g_value_set_float (value, priv->m_fZoom);
        break;
    case PROP_IS_LOADING:
        g_value_set_boolean (value, priv->m_bIsLoading);
        break;
    case PROP_DOC_WIDTH:
        g_value_set_long (value, priv->m_nDocumentWidthTwips);
        break;
    case PROP_DOC_HEIGHT:
        g_value_set_long (value, priv->m_nDocumentHeightTwips);
        break;
    case PROP_CAN_ZOOM_IN:
        g_value_set_boolean (value, priv->m_bCanZoomIn);
        break;
    case PROP_CAN_ZOOM_OUT:
        g_value_set_boolean (value, priv->m_bCanZoomOut);
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, propId, pspec);
    }
}

static gboolean lok_doc_view_draw (GtkWidget* pWidget, cairo_t* pCairo)
{
    LOKDocView *pDocView = LOK_DOC_VIEW (pWidget);

    renderDocument (pDocView, pCairo);
    renderOverlay (pDocView, pCairo);

    return FALSE;
}

static void lok_doc_view_finalize (GObject* object)
{
    LOKDocView* pDocView = LOK_DOC_VIEW (object);
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));

    if (priv->m_pDocument)
        priv->m_pDocument->pClass->destroy (priv->m_pDocument);
    if (priv->m_pOffice)
        priv->m_pOffice->pClass->destroy (priv->m_pOffice);

    G_OBJECT_CLASS (lok_doc_view_parent_class)->finalize (object);
}

static gboolean lok_doc_view_initable_init (GInitable *initable, GCancellable* /*cancellable*/, GError **error)
{
    LOKDocView *pDocView = LOK_DOC_VIEW (initable);
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));

    if (priv->m_pOffice != NULL)
        return TRUE;

    priv->m_pOffice = lok_init (priv->m_aLOPath);

    if (priv->m_pOffice == NULL)
    {
        g_set_error (error,
                     g_quark_from_static_string ("LOK initialization error"), 0,
                     "Failed to get LibreOfficeKit context. Make sure path (%s) is correct",
                     priv->m_aLOPath);
        return FALSE;
    }

    return TRUE;
}

static void lok_doc_view_initable_iface_init (GInitableIface *iface)
{
    iface->init = lok_doc_view_initable_init;
}

static void lok_doc_view_class_init (LOKDocViewClass* pClass)
{
    GObjectClass *pGObjectClass = G_OBJECT_CLASS(pClass);
    GtkWidgetClass *pWidgetClass = GTK_WIDGET_CLASS(pClass);

    pGObjectClass->get_property = lok_doc_view_get_property;
    pGObjectClass->set_property = lok_doc_view_set_property;
    pGObjectClass->finalize = lok_doc_view_finalize;

    pWidgetClass->draw = lok_doc_view_draw;
    pWidgetClass->button_press_event = lok_doc_view_signal_button;
    pWidgetClass->button_release_event = lok_doc_view_signal_button;
    pWidgetClass->key_press_event = signalKey;
    pWidgetClass->key_release_event = signalKey;
    pWidgetClass->motion_notify_event = lok_doc_view_signal_motion;

    /**
     * LOKDocView:lopath:
     *
     * The absolute path of the LibreOffice install.
     */
    g_object_class_install_property (pGObjectClass,
          PROP_LO_PATH,
          g_param_spec_string("lopath",
                              "LO Path",
                              "LibreOffice Install Path",
                              0,
                              static_cast<GParamFlags>(G_PARAM_READWRITE
                                                       | G_PARAM_CONSTRUCT_ONLY)));

    /**
     * LOKDocView:lopointer:
     *
     * A LibreOfficeKit* in case lok_init() is already called
     * previously.
     */
    g_object_class_install_property (pGObjectClass,
          PROP_LO_POINTER,
          g_param_spec_pointer("lopointer",
                              "LO Pointer",
                              "A LibreOfficeKit* from lok_init()",
                              static_cast<GParamFlags>(G_PARAM_READWRITE
                                                       | G_PARAM_CONSTRUCT_ONLY)));

    /**
     * LOKDocView:docpath:
     *
     * The path of the document that is currently being viewed.
     */
    g_object_class_install_property (pGObjectClass,
          PROP_DOC_PATH,
          g_param_spec_string("docpath",
                              "Document Path",
                              "The URI of the document to open",
                              0,
                              static_cast<GParamFlags>(G_PARAM_READWRITE)));

    /**
     * LOKDocView:docpointer:
     *
     * A LibreOfficeKitDocument* in case documentLoad() is already called
     * previously.
     */
    g_object_class_install_property (pGObjectClass,
          PROP_DOC_POINTER,
          g_param_spec_pointer("docpointer",
                              "Document Pointer",
                              "A LibreOfficeKitDocument* from documentLoad()",
                              static_cast<GParamFlags>(G_PARAM_READWRITE)));

    /**
     * LOKDocView:editable:
     *
     * Whether the document loaded inside of #LOKDocView is editable or not.
     */
    g_object_class_install_property (pGObjectClass,
          PROP_EDITABLE,
          g_param_spec_boolean("editable",
                               "Editable",
                               "Whether the content is in edit mode or not",
                               FALSE,
                               static_cast<GParamFlags>(G_PARAM_READWRITE)));

    /**
     * LOKDocView:load-progress:
     *
     * The percent completion of the current loading operation of the
     * document. This can be used for progress bars. Note that this is not a
     * very accurate progress indicator, and its value might reset it couple of
     * times to 0 and start again. You should not rely on its numbers.
     */
    g_object_class_install_property (pGObjectClass,
          PROP_LOAD_PROGRESS,
          g_param_spec_double("load-progress",
                              "Estimated Load Progress",
                              "Shows the progress of the document load operation",
                              0.0, 1.0, 0.0,
                              G_PARAM_READABLE));

    /**
     * LOKDocView:zoom-level:
     *
     * The current zoom level of the document loaded inside #LOKDocView. The
     * default value is 1.0.
     */
    g_object_class_install_property (pGObjectClass,
          PROP_ZOOM,
          g_param_spec_float("zoom-level",
                             "Zoom Level",
                             "The current zoom level of the content",
                             0, 5.0, 1.0,
                             static_cast<GParamFlags>(G_PARAM_READWRITE |
                                                      G_PARAM_CONSTRUCT)));

    /**
     * LOKDocView:is-loading:
     *
     * Whether the requested document is being loaded or not. %TRUE if it is
     * being loaded, otherwise %FALSE.
     */
    g_object_class_install_property (pGObjectClass,
          PROP_IS_LOADING,
          g_param_spec_boolean("is-loading",
                               "Is Loading",
                               "Whether the view is loading a document",
                               FALSE,
                               static_cast<GParamFlags>(G_PARAM_READABLE)));

    /**
     * LOKDocView:doc-width:
     *
     * The width of the currently loaded document in #LOKDocView in twips.
     */
    g_object_class_install_property (pGObjectClass,
          PROP_DOC_WIDTH,
          g_param_spec_long("doc-width",
                            "Document Width",
                            "Width of the document in twips",
                            0, G_MAXLONG, 0,
                            static_cast<GParamFlags>(G_PARAM_READWRITE)));

    /**
     * LOKDocView:doc-height:
     *
     * The height of the currently loaded document in #LOKDocView in twips.
     */
    g_object_class_install_property (pGObjectClass,
          PROP_DOC_HEIGHT,
          g_param_spec_long("doc-height",
                            "Document Height",
                            "Height of the document in twips",
                            0, G_MAXLONG, 0,
                            static_cast<GParamFlags>(G_PARAM_READWRITE)));

    /**
     * LOKDocView:can-zoom-in:
     *
     * It tells whether the view can further be zoomed in or not.
     */
    g_object_class_install_property (pGObjectClass,
          PROP_CAN_ZOOM_IN,
          g_param_spec_boolean("can-zoom-in",
                               "Can Zoom In",
                               "Whether the view can be zoomed in further",
                               TRUE,
                               static_cast<GParamFlags>(G_PARAM_READABLE
                                                       | G_PARAM_STATIC_STRINGS)));

    /**
     * LOKDocView:can-zoom-out:
     *
     * It tells whether the view can further be zoomed out or not.
     */
    g_object_class_install_property (pGObjectClass,
          PROP_CAN_ZOOM_OUT,
          g_param_spec_boolean("can-zoom-out",
                               "Can Zoom Out",
                               "Whether the view can be zoomed out further",
                               TRUE,
                               static_cast<GParamFlags>(G_PARAM_READABLE
                                                       | G_PARAM_STATIC_STRINGS)));

    /**
     * LOKDocView::load-changed:
     * @pDocView: the #LOKDocView on which the signal is emitted
     * @fLoadProgress: the new progress value
     */
    doc_view_signals[LOAD_CHANGED] =
        g_signal_new("load-changed",
                     G_TYPE_FROM_CLASS (pGObjectClass),
                     G_SIGNAL_RUN_FIRST,
                     0,
                     NULL, NULL,
                     g_cclosure_marshal_VOID__DOUBLE,
                     G_TYPE_NONE, 1,
                     G_TYPE_DOUBLE);

    /**
     * LOKDocView::edit-changed:
     * @pDocView: the #LOKDocView on which the signal is emitted
     * @bEdit: the new edit value of the view
     */
    doc_view_signals[EDIT_CHANGED] =
        g_signal_new("edit-changed",
                     G_TYPE_FROM_CLASS (pGObjectClass),
                     G_SIGNAL_RUN_FIRST,
                     0,
                     NULL, NULL,
                     g_cclosure_marshal_VOID__BOOLEAN,
                     G_TYPE_NONE, 1,
                     G_TYPE_BOOLEAN);

    /**
     * LOKDocView::command-changed:
     * @pDocView: the #LOKDocView on which the signal is emitted
     * @aCommand: the command that was changed
     */
    doc_view_signals[COMMAND_CHANGED] =
        g_signal_new("command-changed",
                     G_TYPE_FROM_CLASS(pGObjectClass),
                     G_SIGNAL_RUN_FIRST,
                     0,
                     NULL, NULL,
                     g_cclosure_marshal_VOID__STRING,
                     G_TYPE_NONE, 1,
                     G_TYPE_STRING);

    /**
     * LOKDocView::search-not-found:
     * @pDocView: the #LOKDocView on which the signal is emitted
     * @aCommand: the string for which the search was not found.
     */
    doc_view_signals[SEARCH_NOT_FOUND] =
        g_signal_new("search-not-found",
                     G_TYPE_FROM_CLASS(pGObjectClass),
                     G_SIGNAL_RUN_FIRST,
                     0,
                     NULL, NULL,
                     g_cclosure_marshal_VOID__STRING,
                     G_TYPE_NONE, 1,
                     G_TYPE_STRING);

    /**
     * LOKDocView::part-changed:
     * @pDocView: the #LOKDocView on which the signal is emitted
     * @aCommand: the part number which the view changed to
     */
    doc_view_signals[PART_CHANGED] =
        g_signal_new("part-changed",
                     G_TYPE_FROM_CLASS(pGObjectClass),
                     G_SIGNAL_RUN_FIRST,
                     0,
                     NULL, NULL,
                     g_cclosure_marshal_VOID__INT,
                     G_TYPE_NONE, 1,
                     G_TYPE_INT);

    /**
     * LOKDocView::size-changed:
     * @pDocView: the #LOKDocView on which the signal is emitted
     * @aCommand: NULL, we just notify that want to notify the UI elements that are interested.
     */
    doc_view_signals[SIZE_CHANGED] =
        g_signal_new("size-changed",
                     G_TYPE_FROM_CLASS(pGObjectClass),
                     G_SIGNAL_RUN_FIRST,
                     0,
                     NULL, NULL,
                     g_cclosure_marshal_VOID__VOID,
                     G_TYPE_NONE, 1,
                     G_TYPE_INT);

    /**
     * LOKDocView::hyperlinked-clicked:
     * @pDocView: the #LOKDocView on which the signal is emitted
     * @aHyperlink: the URI which the application should handle
     */
    doc_view_signals[HYPERLINK_CLICKED] =
        g_signal_new("hyperlink-clicked",
                     G_TYPE_FROM_CLASS(pGObjectClass),
                     G_SIGNAL_RUN_FIRST,
                     0,
                     NULL, NULL,
                     g_cclosure_marshal_VOID__STRING,
                     G_TYPE_NONE, 1,
                     G_TYPE_STRING);

    /**
     * LOKDocView::cursor-changed:
     * @pDocView: the #LOKDocView on which the signal is emitted
     * @nX: The new cursor position (X coordinate) in pixels
     * @nY: The new cursor position (Y coordinate) in pixels
     * @nWidth: The width of new cursor
     * @nHeight: The height of new cursor
     */
    doc_view_signals[CURSOR_CHANGED] =
        g_signal_new("cursor-changed",
                     G_TYPE_FROM_CLASS(pGObjectClass),
                     G_SIGNAL_RUN_FIRST,
                     0,
                     NULL, NULL,
                     g_cclosure_marshal_generic,
                     G_TYPE_NONE, 4,
                     G_TYPE_INT, G_TYPE_INT,
                     G_TYPE_INT, G_TYPE_INT);
    /**
     * LOKDocView::search-result-count:
     * @pDocView: the #LOKDocView on which the signal is emitted
     * @aCommand: number of matches.
     */
    doc_view_signals[SEARCH_RESULT_COUNT] =
        g_signal_new("search-result_count",
                     G_TYPE_FROM_CLASS(pGObjectClass),
                     G_SIGNAL_RUN_FIRST,
                     0,
                     NULL, NULL,
                     g_cclosure_marshal_VOID__STRING,
                     G_TYPE_NONE, 1,
                     G_TYPE_STRING);

}

SAL_DLLPUBLIC_EXPORT GtkWidget*
lok_doc_view_new (const gchar* pPath, GCancellable *cancellable, GError **error)
{
    return GTK_WIDGET (g_initable_new (LOK_TYPE_DOC_VIEW, cancellable, error, "lopath", pPath, NULL));
}

SAL_DLLPUBLIC_EXPORT GtkWidget* lok_doc_view_new_from_widget(LOKDocView* pOldLOKDocView)
{
    LOKDocViewPrivate* pOldPriv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private(pOldLOKDocView));
    GtkWidget* pNewDocView = GTK_WIDGET(g_initable_new(LOK_TYPE_DOC_VIEW, /*cancellable=*/0, /*error=*/0,
                                                       "lopath", pOldPriv->m_aLOPath, "lopointer", pOldPriv->m_pOffice, "docpointer", pOldPriv->m_pDocument, NULL));

    // No documentLoad(), just a createView().
    LibreOfficeKitDocument* pDocument = lok_doc_view_get_document(LOK_DOC_VIEW(pNewDocView));
    LOKDocViewPrivate* pNewPriv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private(LOK_DOC_VIEW(pNewDocView)));
    pNewPriv->m_nViewId = pDocument->pClass->createView(pDocument);

    postDocumentLoad(pNewDocView);
    return pNewDocView;
}

SAL_DLLPUBLIC_EXPORT gboolean
lok_doc_view_open_document_finish (LOKDocView* pDocView, GAsyncResult* res, GError** error)
{
    GTask* task = G_TASK(res);

    g_return_val_if_fail(g_task_is_valid(res, pDocView), false);
    //FIXME: make source_tag work
    //g_return_val_if_fail(g_task_get_source_tag(task) == lok_doc_view_open_document, NULL);
    g_return_val_if_fail(error == NULL || *error == NULL, false);

    return g_task_propagate_boolean(task, error);
}

SAL_DLLPUBLIC_EXPORT void
lok_doc_view_open_document (LOKDocView* pDocView,
                            const gchar* pPath,
                            GCancellable* cancellable,
                            GAsyncReadyCallback callback,
                            gpointer userdata)
{
    GTask* task = g_task_new(pDocView, cancellable, callback, userdata);
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));

    LOEvent* pLOEvent = new LOEvent(LOK_LOAD_DOC);
    pLOEvent->m_pPath = pPath;

    priv->m_aDocPath = pPath;
    g_task_set_task_data(task, pLOEvent, LOEvent::destroy);

    g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), NULL);
    g_object_unref(task);
}

SAL_DLLPUBLIC_EXPORT LibreOfficeKitDocument*
lok_doc_view_get_document (LOKDocView* pDocView)
{
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    return priv->m_pDocument;
}

SAL_DLLPUBLIC_EXPORT void
lok_doc_view_set_zoom (LOKDocView* pDocView, float fZoom)
{
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));

    priv->m_fZoom = fZoom;
    long nDocumentWidthPixels = twipToPixel(priv->m_nDocumentWidthTwips, fZoom);
    long nDocumentHeightPixels = twipToPixel(priv->m_nDocumentHeightTwips, fZoom);
    // Total number of columns in this document.
    guint nColumns = ceil((double)nDocumentWidthPixels / nTileSizePixels);

    priv->m_aTileBuffer = TileBuffer(priv->m_pDocument,
                                     nColumns);
    gtk_widget_set_size_request(GTK_WIDGET(pDocView),
                                nDocumentWidthPixels,
                                nDocumentHeightPixels);
}

SAL_DLLPUBLIC_EXPORT float
lok_doc_view_get_zoom (LOKDocView* pDocView)
{
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    return priv->m_fZoom;
}

SAL_DLLPUBLIC_EXPORT int
lok_doc_view_get_parts (LOKDocView* pDocView)
{
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
    return priv->m_pDocument->pClass->getParts( priv->m_pDocument );
}

SAL_DLLPUBLIC_EXPORT int
lok_doc_view_get_part (LOKDocView* pDocView)
{
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
    return priv->m_pDocument->pClass->getPart( priv->m_pDocument );
}

SAL_DLLPUBLIC_EXPORT void
lok_doc_view_set_part (LOKDocView* pDocView, int nPart)
{
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    GTask* task = g_task_new(pDocView, NULL, NULL, NULL);
    LOEvent* pLOEvent = new LOEvent(LOK_SET_PART);

    pLOEvent->m_nPart = nPart;
    g_task_set_task_data(task, pLOEvent, LOEvent::destroy);

    g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), NULL);
    g_object_unref(task);
}

SAL_DLLPUBLIC_EXPORT char*
lok_doc_view_get_part_name (LOKDocView* pDocView, int nPart)
{
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    priv->m_pDocument->pClass->setView(priv->m_pDocument, priv->m_nViewId);
    return priv->m_pDocument->pClass->getPartName( priv->m_pDocument, nPart );
}

SAL_DLLPUBLIC_EXPORT void
lok_doc_view_set_partmode(LOKDocView* pDocView,
                          int nPartMode)
{
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    GTask* task = g_task_new(pDocView, NULL, NULL, NULL);
    LOEvent* pLOEvent = new LOEvent(LOK_SET_PARTMODE);
    pLOEvent->m_nPartMode = nPartMode;
    g_task_set_task_data(task, pLOEvent, LOEvent::destroy);

    g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), NULL);
    g_object_unref(task);
}

SAL_DLLPUBLIC_EXPORT void
lok_doc_view_reset_view(LOKDocView* pDocView)
{
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    priv->m_aTileBuffer.resetAllTiles();
    priv->m_nLoadProgress = 0.0;

    memset(&priv->m_aVisibleCursor, 0, sizeof(priv->m_aVisibleCursor));
    priv->m_bCursorOverlayVisible = false;
    priv->m_bCursorVisible = false;

    priv->m_nLastButtonPressTime = 0;
    priv->m_nLastButtonReleaseTime = 0;
    priv->m_aTextSelectionRectangles.clear();

    memset(&priv->m_aTextSelectionStart, 0, sizeof(priv->m_aTextSelectionStart));
    memset(&priv->m_aTextSelectionEnd, 0, sizeof(priv->m_aTextSelectionEnd));
    memset(&priv->m_aGraphicSelection, 0, sizeof(priv->m_aGraphicSelection));
    priv->m_bInDragGraphicSelection = false;

    cairo_surface_destroy(priv->m_pHandleStart);
    priv->m_pHandleStart = 0;
    memset(&priv->m_aHandleStartRect, 0, sizeof(priv->m_aHandleStartRect));
    priv->m_bInDragStartHandle = false;

    cairo_surface_destroy(priv->m_pHandleMiddle);
    priv->m_pHandleMiddle = 0;
    memset(&priv->m_aHandleMiddleRect, 0, sizeof(priv->m_aHandleMiddleRect));
    priv->m_bInDragMiddleHandle = false;

    cairo_surface_destroy(priv->m_pHandleEnd);
    priv->m_pHandleEnd = 0;
    memset(&priv->m_aHandleEndRect, 0, sizeof(priv->m_aHandleEndRect));
    priv->m_bInDragEndHandle = false;

    cairo_surface_destroy(priv->m_pGraphicHandle);
    priv->m_pGraphicHandle = 0;
    memset(&priv->m_aGraphicHandleRects, 0, sizeof(priv->m_aGraphicHandleRects));
    memset(&priv->m_bInDragGraphicHandles, 0, sizeof(priv->m_bInDragGraphicHandles));

    priv->m_nViewId = 0;

    gtk_widget_queue_draw(GTK_WIDGET(pDocView));
}

SAL_DLLPUBLIC_EXPORT void
lok_doc_view_set_edit(LOKDocView* pDocView,
                      gboolean bEdit)
{
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    GTask* task = g_task_new(pDocView, NULL, NULL, NULL);
    LOEvent* pLOEvent = new LOEvent(LOK_SET_EDIT);
    pLOEvent->m_bEdit = bEdit;
    g_task_set_task_data(task, pLOEvent, LOEvent::destroy);

    g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), NULL);
    g_object_unref(task);
}

SAL_DLLPUBLIC_EXPORT gboolean
lok_doc_view_get_edit (LOKDocView* pDocView)
{
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    return priv->m_bEdit;
}


SAL_DLLPUBLIC_EXPORT void
lok_doc_view_post_command (LOKDocView* pDocView,
                           const gchar* pCommand,
                           const gchar* pArguments)
{
    LOKDocViewPrivate* priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    GTask* task = g_task_new(pDocView, NULL, NULL, NULL);
    LOEvent* pLOEvent = new LOEvent(LOK_POST_COMMAND);
    pLOEvent->m_pCommand = pCommand;
    pLOEvent->m_pArguments  = g_strdup(pArguments);

    g_task_set_task_data(task, pLOEvent, LOEvent::destroy);
    g_thread_pool_push(priv->lokThreadPool, g_object_ref(task), NULL);
    g_object_unref(task);
}

SAL_DLLPUBLIC_EXPORT float
lok_doc_view_pixel_to_twip (LOKDocView* pDocView, float fInput)
{
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    return pixelToTwip(fInput, priv->m_fZoom);
}

SAL_DLLPUBLIC_EXPORT float
lok_doc_view_twip_to_pixel (LOKDocView* pDocView, float fInput)
{
    LOKDocViewPrivate *priv = static_cast<LOKDocViewPrivate*>(lok_doc_view_get_instance_private (pDocView));
    return twipToPixel(fInput, priv->m_fZoom);
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */