libreoffice/include/vcl/controllayout.hxx

/* -*- 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/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#ifndef INCLUDED_VCL_CONTROLLAYOUT_HXX
#define INCLUDED_VCL_CONTROLLAYOUT_HXX

#include <rtl/ustring.hxx>
#include <tools/gen.hxx>
#include <vector>
#include <vcl/dllapi.h>
#include <vcl/ctrl.hxx>

namespace vcl
{

struct VCL_DLLPUBLIC ControlLayoutData
{
    // contains the string really displayed
    // there must be exactly one bounding rectangle in m_aUnicodeBoundRects
    // for every character in m_aDisplayText
    OUString                            m_aDisplayText;
    // the bounding rectangle of every character
    // where one character may consist of many glyphs
    std::vector< Rectangle >            m_aUnicodeBoundRects;
    // start indices of lines
    std::vector< long >                 m_aLineIndices;
    // notify parent control on destruction
    VclPtr<const Control>               m_pParent;

    ControlLayoutData();
    ~ControlLayoutData();

    Rectangle GetCharacterBounds( long nIndex ) const;
    // returns the character index for corresponding to rPoint (in control coordinates)
    // -1 is returned if no character is at that point
    long GetIndexForPoint( const Point& rPoint ) const;
    // returns the number of lines in the result of GetDisplayText()
    long GetLineCount() const;
    // returns the interval [start,end] of line nLine
    // returns [-1,-1] for an invalid line
    ::Pair GetLineStartEnd( long nLine ) const;
    /** ToRelativeLineIndex changes a layout data index to a count relative to its line.

    This is equivalent to getting the line start/end pairs with
    GetLineStartEnd until the index lies within [start,end] of a line

    @param nIndex
    the absolute index inside the display text to be changed to a relative index

    @returns
    the relative index inside the displayed line or -1 if the absolute index does
    not match any line
    */
    long ToRelativeLineIndex( long nIndex ) const;
};

} // namespace vcl

#endif // INCLUDED_VCL_CONTROLLAYOUT_HXX

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