Dragging text from FlatLabel is supported.

Started drag-n-drop support for chat photo updating.

Telegram/Resources/langs/lang.strings

@@ -457,6 +457,8 @@ Copyright (c) 2014-2016 John Preston, https://desktop.telegram.org
 "lng_profile_shared_links_header" = "Shared links overview";
 "lng_profile_copy_phone" = "Copy phone number";
 "lng_profile_copy_fullname" = "Copy name";
+"lng_profile_drop_area_title" = "Drop your image here";
+"lng_profile_drop_area_subtitle" = "to set it as a group photo";
 
 "lng_channel_add_admins" = "New administrator";
 "lng_channel_add_members" = "Add members";

Telegram/SourceFiles/profile/profile.style

@@ -76,6 +76,16 @@ profileSecondaryButton: BoxButton(profilePrimaryButton) {
 	textBgOver: #f2f7fa;
 }
 
+profileDropAreaBg: profileBg;
+profileDropAreaFg: #3fb0e4;
+profileDropAreaPadding: margins(30px, 20px, 30px, 20px);
+profileDropAreaTitleFont: font(24px);
+profileDropAreaTitleTop: 36px;
+profileDropAreaSubtitleFont: font(16px);
+profileDropAreaSubtitleTop: 72px;
+profileDropAreaBorderFg: profileDropAreaFg;
+profileDropAreaBorderWidth: 3px;
+
 profileDividerFg: black;
 profileDividerLeft: icon {
 	{ "profile_divider_left", profileDividerFg },

Telegram/SourceFiles/profile/profile_cover.cpp

@@ -123,6 +123,50 @@ private:
 
 };
 
+class DropArea : public TWidget {
+public:
+	DropArea(QWidget *parent) : TWidget(parent) {
+	}
+
+	void showAnimated() {
+		show();
+	}
+
+protected:
+	void paintEvent(QPaintEvent *e) override {
+		Painter p(this);
+		p.fillRect(e->rect(), st::profileDropAreaBg);
+
+		if (width() < st::profileDropAreaPadding.left() + st::profileDropAreaPadding.right()) return;
+		if (height() < st::profileDropAreaPadding.top() + st::profileDropAreaPadding.bottom()) return;
+
+		auto border = st::profileDropAreaBorderWidth;
+		auto &borderFg = st::profileDropAreaBorderFg;
+		auto inner = rect().marginsRemoved(st::profileDropAreaPadding);
+		p.fillRect(inner.x(), inner.y(), inner.width(), border, borderFg);
+		p.fillRect(inner.x(), inner.y() + inner.height() - border, inner.width(), border, borderFg);
+		p.fillRect(inner.x(), inner.y() + border, border, inner.height() - 2 * border, borderFg);
+		p.fillRect(inner.x() + inner.width() - border, inner.y() + border, border, inner.height() - 2 * border, borderFg);
+
+		auto title = lang(lng_profile_drop_area_title);
+		int titleWidth = st::profileDropAreaTitleFont->width(title);
+		int titleLeft = inner.x() + (inner.width() - titleWidth) / 2;
+		int titleTop = inner.y() + st::profileDropAreaTitleTop + st::profileDropAreaTitleFont->ascent;
+		p.setFont(st::profileDropAreaTitleFont);
+		p.setPen(st::profileDropAreaFg);
+		p.drawText(titleLeft, titleTop, title);
+
+		auto subtitle = lang(lng_profile_drop_area_subtitle);
+		int subtitleWidth = st::profileDropAreaSubtitleFont->width(subtitle);
+		int subtitleLeft = inner.x() + (inner.width() - subtitleWidth) / 2;
+		int subtitleTop = inner.y() + st::profileDropAreaSubtitleTop + st::profileDropAreaSubtitleFont->ascent;
+		p.setFont(st::profileDropAreaSubtitleFont);
+		p.setPen(st::profileDropAreaFg);
+		p.drawText(subtitleLeft, subtitleTop, subtitle);
+	}
+
+};
+
 CoverWidget::CoverWidget(QWidget *parent, PeerData *peer) : TWidget(parent)
 , _peer(peer)
 , _peerUser(peer->asUser())
@@ -132,6 +176,7 @@ CoverWidget::CoverWidget(QWidget *parent, PeerData *peer) : TWidget(parent)
 , _photoButton(this, peer)
 , _name(this, QString(), st::profileNameLabel) {
 	setAttribute(Qt::WA_OpaquePaintEvent);
+	setAcceptDrops(true);
 
 	_name.setSelectable(true);
 	_name.setContextCopyText(lang(lng_profile_copy_fullname));
@@ -204,6 +249,23 @@ void CoverWidget::paintEvent(QPaintEvent *e) {
 	paintDivider(p);
 }
 
+void CoverWidget::dragEnterEvent(QDragEnterEvent *e) {
+	_dropArea = new DropArea(this);
+	_dropArea->setGeometry(0, 0, width(), _dividerTop);
+	_dropArea->showAnimated();
+	e->accept();
+}
+
+void CoverWidget::dragLeaveEvent(QDragLeaveEvent *e) {
+	delete _dropArea;
+	_dropArea = nullptr;
+}
+
+void CoverWidget::dropEvent(QDropEvent *e) {
+	delete _dropArea;
+	_dropArea = nullptr;
+}
+
 void CoverWidget::paintDivider(Painter &p) {
 	st::profileDividerLeft.paint(p, QPoint(st::lineWidth, _dividerTop), width());
 

Telegram/SourceFiles/profile/profile_cover.h

@@ -36,6 +36,7 @@ namespace Profile {
 
 class BackButton;
 class PhotoButton;
+class DropArea;
 
 class CoverWidget final : public TWidget, public Notify::Observer {
 	Q_OBJECT
@@ -58,6 +59,9 @@ private slots:
 
 protected:
 	void paintEvent(QPaintEvent *e) override;
+	void dragEnterEvent(QDragEnterEvent *e) override;
+	void dragLeaveEvent(QDragLeaveEvent *e) override;
+	void dropEvent(QDropEvent *e) override;
 
 private:
 	// Observed notifications.
@@ -85,8 +89,8 @@ private:
 	ChannelData *_peerChannel;
 	ChannelData *_peerMegagroup;
 
-	// Cover content
 	ChildWidget<PhotoButton> _photoButton;
+	ChildWidget<DropArea> _dropArea = { nullptr };
 
 	FlatLabel _name;
 

Telegram/SourceFiles/ui/flatlabel.cpp

@@ -120,6 +120,7 @@ Text::StateResult FlatLabel::dragActionStart(const QPoint &p, Qt::MouseButton bu
 	if (_dragWasInactive) App::wnd()->inactivePress(false);
 
 	if (ClickHandler::getPressed()) {
+		_dragStartPosition = mapFromGlobal(_lastMousePos);
 		_dragAction = PrepareDrag;
 	}
 	if (!_selectable || _dragAction != NoDrag) {
@@ -147,6 +148,7 @@ Text::StateResult FlatLabel::dragActionStart(const QPoint &p, Qt::MouseButton bu
 			}
 		}
 		if (uponSelected) {
+			_dragStartPosition = mapFromGlobal(_lastMousePos);
 			_dragAction = PrepareDrag; // start text drag
 		} else if (!_dragWasInactive) {
 			if (state.afterSymbol) ++_dragSymbol;
@@ -391,6 +393,33 @@ void FlatLabel::onContextMenuDestroy(QObject *obj) {
 	}
 }
 
+void FlatLabel::onExecuteDrag() {
+	if (_dragAction != Dragging) return;
+
+	auto state = getTextState(_dragStartPosition);
+	bool uponSelected = state.uponSymbol && _selection.from <= state.symbol;
+	if (uponSelected) {
+		if (_dragSymbol < _selection.from || _dragSymbol >= _selection.to) {
+			uponSelected = false;
+		}
+	}
+
+	ClickHandlerPtr pressedHandler = ClickHandler::getPressed();
+	QString selectedText;
+	if (uponSelected) {
+		selectedText = _text.originalText(_selection, ExpandLinksAll);
+	} else if (pressedHandler) {
+		selectedText = pressedHandler->dragText();
+	}
+	if (!selectedText.isEmpty()) {
+		auto mimeData = new QMimeData();
+		mimeData->setText(selectedText);
+		auto drag = new QDrag(App::wnd());
+		drag->setMimeData(mimeData);
+		drag->exec(Qt::CopyAction);
+	}
+}
+
 void FlatLabel::clickHandlerActiveChanged(const ClickHandlerPtr &action, bool active) {
 	update();
 }
@@ -400,10 +429,15 @@ void FlatLabel::clickHandlerPressedChanged(const ClickHandlerPtr &action, bool a
 }
 
 Text::StateResult FlatLabel::dragActionUpdate() {
-	QPoint m(mapFromGlobal(_lastMousePos));
+	auto m = mapFromGlobal(_lastMousePos);
-	LOG(("DRAG ACTION UPDATE: %1 %2").arg(m.x()).arg(m.y()));
 	auto state = getTextState(m);
 	updateHover(state);
+
+	if (_dragAction == PrepareDrag && (m - _dragStartPosition).manhattanLength() >= QApplication::startDragDistance()) {
+		_dragAction = Dragging;
+		QTimer::singleShot(1, this, SLOT(onExecuteDrag()));
+	}
+
 	return state;
 }
 

Telegram/SourceFiles/ui/flatlabel.h

@@ -64,6 +64,8 @@ private slots:
 	void onTouchSelect();
 	void onContextMenuDestroy(QObject *obj);
 
+	void onExecuteDrag();
+
 private:
 	Text::StateResult dragActionUpdate();
 	Text::StateResult dragActionStart(const QPoint &p, Qt::MouseButton button);
@@ -100,10 +102,10 @@ private:
 		NoDrag = 0x00,
 		PrepareDrag = 0x01,
 		Dragging = 0x02,
-		PrepareSelect = 0x03,
 		Selecting = 0x04,
 	};
 	DragAction _dragAction = NoDrag;
+	QPoint _dragStartPosition;
 	uint16 _dragSymbol = 0;
 	bool _dragWasInactive = false;