Remove history_item and layout from pch.

Also move some code to separate modules.
Also create history item views by Window::Controller.

Telegram/SourceFiles/window/notifications_manager_default.cpp

@@ -20,6 +20,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "styles/style_window.h"
 #include "storage/file_download.h"
 #include "auth_session.h"
+#include "history/history_item.h"
 #include "platform/platform_specific.h"
 
 namespace Window {
@@ -63,6 +64,16 @@ Manager::Manager(System *system) : Notifications::Manager(system) {
 	_inputCheckTimer.setTimeoutHandler([this] { checkLastInput(); });
 }
 
+Manager::QueuedNotification::QueuedNotification(
+	not_null<HistoryItem*> item
+	, int forwardedCount)
+: history(item->history())
+, peer(history->peer)
+, author((!peer->isUser() && !item->isPost()) ? item->author() : nullptr)
+, item((forwardedCount < 2) ? item.get() : nullptr)
+, forwardedCount(forwardedCount) {
+}
+
 QPixmap Manager::hiddenUserpicPlaceholder() const {
 	if (_hiddenUserpicPlaceholder.isNull()) {
 		_hiddenUserpicPlaceholder = App::pixmapFromImageInPlace(Messenger::Instance().logoNoMargin().scaled(st::notifyPhotoSize, st::notifyPhotoSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation));

Telegram/SourceFiles/window/notifications_manager_default.h

@@ -82,16 +82,10 @@ private:
 	SingleTimer _inputCheckTimer;
 
 	struct QueuedNotification {
-		QueuedNotification(HistoryItem *item, int forwardedCount)
-		: history(item->history())
-		, peer(history->peer)
-		, author((!peer->isUser() && !item->isPost()) ? item->author() : nullptr)
-		, item((forwardedCount > 1) ? nullptr : item)
-		, forwardedCount(forwardedCount) {
-		}
+		QueuedNotification(not_null<HistoryItem*> item, int forwardedCount);
 
-		History *history;
-		PeerData *peer;
+		not_null<History*> history;
+		not_null<PeerData*> peer;
 		PeerData *author;
 		HistoryItem *item;
 		int forwardedCount;

Telegram/SourceFiles/window/themes/window_theme_editor.cpp

@@ -10,6 +10,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "window/themes/window_theme.h"
 #include "window/themes/window_theme_editor_block.h"
 #include "mainwindow.h"
+#include "layout.h"
 #include "storage/localstorage.h"
 #include "boxes/confirm_box.h"
 #include "styles/style_window.h"

Telegram/SourceFiles/window/window_controller.cpp

@@ -9,7 +9,10 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "window/main_window.h"
 #include "info/info_memento.h"
+#include "history/view/history_view_element.h"
 #include "history/view/history_view_message.h"
+#include "history/view/history_view_service_message.h"
+#include "history/history_item.h"
 #include "mainwidget.h"
 #include "mainwindow.h"
 #include "styles/style_window.h"
@@ -403,4 +406,16 @@ not_null<MainWidget*> Controller::chats() const {
 	return App::wnd()->chatsWidget();
 }
 
+std::unique_ptr<HistoryView::Element> Controller::createMessageView(
+		not_null<HistoryMessage*> message,
+		HistoryView::Context context) {
+	return std::make_unique<HistoryView::Message>(message, context);
+}
+
+std::unique_ptr<HistoryView::Element> Controller::createMessageView(
+		not_null<HistoryService*> message,
+		HistoryView::Context context) {
+	return std::make_unique<HistoryView::Service>(message, context);
+}
+
 } // namespace Window

Telegram/SourceFiles/window/window_controller.h

@@ -11,6 +11,12 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "base/flags.h"
 
 class MainWidget;
+class HistoryMessage;
+class HistoryService;
+
+namespace HistoryView {
+enum class Context : char;
+} // namespace HistoryView
 
 namespace Window {
 
@@ -195,6 +201,13 @@ public:
 		return this;
 	}
 
+	std::unique_ptr<HistoryView::Element> createMessageView(
+		not_null<HistoryMessage*> message,
+		HistoryView::Context context);
+	std::unique_ptr<HistoryView::Element> createMessageView(
+		not_null<HistoryService*> message,
+		HistoryView::Context context);
+
 private:
 	int minimalThreeColumnWidth() const;
 	not_null<MainWidget*> chats() const;