Open chat on exact clicked message from preview.

Telegram/SourceFiles/dialogs/dialogs_inner_widget.cpp

@@ -2326,10 +2326,34 @@ void InnerWidget::showChatPreview(bool onlyUserpic) {
 	mousePressReleased(QCursor::pos(), Qt::NoButton, Qt::NoModifier);
 
 	_chatPreviewKey = key;
-	_menu = HistoryView::MakeChatPreview(this, key.entry());
-	if (!_menu) {
+	auto preview = HistoryView::MakeChatPreview(this, key.entry());
+	if (!preview.menu) {
 		return;
 	}
+	_menu = std::move(preview.menu);
+	const auto weakMenu = Ui::MakeWeak(_menu.get());
+	const auto weakThread = base::make_weak(key.entry()->asThread());
+	const auto weakController = base::make_weak(_controller);
+	std::move(
+		preview.actions
+	) | rpl::start_with_next([=](HistoryView::ChatPreviewAction action) {
+		if (const auto controller = weakController.get()) {
+			if (const auto thread = weakThread.get()) {
+				const auto itemId = action.openItemId;
+				const auto owner = &thread->owner();
+				if (action.openInfo) {
+					controller->showPeerInfo(thread);
+				} else if (const auto item = owner->message(itemId)) {
+					controller->showMessage(item);
+				} else {
+					controller->showThread(thread);
+				}
+			}
+		}
+		if (const auto strong = weakMenu.data()) {
+			strong->hideMenu();
+		}
+	}, _menu->lifetime());
 	QObject::connect(_menu.get(), &QObject::destroyed, [=] {
 		if (_chatPreviewKey) {
 			updateDialogRow(RowDescriptor(base::take(_chatPreviewKey), {}));

Telegram/SourceFiles/history/view/history_view_chat_preview.cpp

@@ -25,6 +25,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/widgets/menu/menu_item_base.h"
 #include "window/themes/window_theme.h"
 #include "window/section_widget.h"
+#include "window/window_session_controller.h"
 #include "styles/style_chat.h"
 
 namespace HistoryView {
@@ -36,8 +37,12 @@ class Item final
 public:
 	Item(not_null<Ui::RpWidget*> parent, not_null<Data::Thread*> thread);
 
-	not_null<QAction*> action() const override;
-	bool isEnabled() const override;
+	[[nodiscard]] not_null<QAction*> action() const override;
+	[[nodiscard]] bool isEnabled() const override;
+
+	[[nodiscard]] rpl::producer<ChatPreviewAction> actions() {
+		return _actions.events();
+	}
 
 private:
 	int contentHeight() const override;
@@ -146,6 +151,7 @@ private:
 	const std::unique_ptr<Ui::ElasticScroll> _scroll;
 
 	QPointer<HistoryView::ListWidget> _inner;
+	rpl::event_stream<ChatPreviewAction> _actions;
 
 	QImage _bg;
 
@@ -180,6 +186,22 @@ Item::Item(not_null<Ui::RpWidget*> parent, not_null<Data::Thread*> thread)
 	using Type = Ui::ElasticScroll::OverscrollType;
 	_scroll->setOverscrollTypes(Type::Real, Type::Real);
 
+	_scroll->events() | rpl::start_with_next([=](not_null<QEvent*> e) {
+		if (e->type() == QEvent::MouseButtonPress) {
+			const auto relative = Ui::MapFrom(
+				_inner.data(),
+				_scroll.get(),
+				static_cast<QMouseEvent*>(e.get())->pos());
+			if (const auto view = _inner->lookupItemByY(relative.y())) {
+				_actions.fire(ChatPreviewAction{
+					.openItemId = view->data()->fullId(),
+				});
+			} else {
+				_actions.fire(ChatPreviewAction{});
+			}
+		}
+	}, lifetime());
+
 	_inner->resizeToWidth(_scroll->width(), _scroll->height());
 
 	_inner->refreshViewer();
@@ -519,31 +541,36 @@ void Item::listLaunchDrag(
 
 } // namespace
 
-base::unique_qptr<Ui::PopupMenu> MakeChatPreview(
+ChatPreview MakeChatPreview(
 		QWidget *parent,
 		not_null<Dialogs::Entry*> entry) {
 	const auto thread = entry->asThread();
 	if (!thread) {
-		return nullptr;
+		return {};
 	} else if (const auto history = entry->asHistory()) {
 		if (history->peer->isForum()) {
-			return nullptr;
+			return {};
 		}
 	}
 
-	auto result = base::make_unique_q<Ui::PopupMenu>(
-		parent,
-		st::previewMenu);
+	auto result = ChatPreview{
+		.menu = base::make_unique_q<Ui::PopupMenu>(
+			parent,
+			st::previewMenu),
+	};
+	const auto menu = result.menu.get();
 
-	result->addAction(base::make_unique_q<Item>(result.get(), thread));
+	auto action = base::make_unique_q<Item>(menu, thread);
+	result.actions = action->actions();
+	menu->addAction(std::move(action));
 	if (const auto topic = thread->asTopic()) {
-		const auto weak = Ui::MakeWeak(result.get());
+		const auto weak = Ui::MakeWeak(menu);
 		topic->destroyed() | rpl::start_with_next([weak] {
 			if (const auto strong = weak.data()) {
 				LOG(("Preview hidden for a destroyed topic."));
 				strong->hideMenu(true);
 			}
-		}, result->lifetime());
+		}, menu->lifetime());
 	}
 
 	return result;

Telegram/SourceFiles/history/view/history_view_chat_preview.h

@@ -19,7 +19,17 @@ class PopupMenu;
 
 namespace HistoryView {
 
-[[nodiscard]] base::unique_qptr<Ui::PopupMenu> MakeChatPreview(
+struct ChatPreviewAction {
+	FullMsgId openItemId;
+	bool openInfo = false;
+};
+
+struct ChatPreview {
+	base::unique_qptr<Ui::PopupMenu> menu;
+	rpl::producer<ChatPreviewAction> actions;
+};
+
+[[nodiscard]] ChatPreview MakeChatPreview(
 	QWidget *parent,
 	not_null<Dialogs::Entry*> entry);
 

Telegram/SourceFiles/history/view/history_view_list_widget.cpp

@@ -1584,6 +1584,10 @@ bool ListWidget::hasSelectRestriction() const {
 		!= CopyRestrictionType::None;
 }
 
+Element *ListWidget::lookupItemByY(int y) const {
+	return strictFindItemByY(y);
+}
+
 auto ListWidget::findViewForPinnedTracking(int top) const
 -> std::pair<Element*, int> {
 	const auto findScrollTopItem = [&](int top)

Telegram/SourceFiles/history/view/history_view_list_widget.h

@@ -344,6 +344,7 @@ public:
 	[[nodiscard]] bool hasCopyRestrictionForSelected() const;
 	[[nodiscard]] bool showCopyRestrictionForSelected();
 	[[nodiscard]] bool hasSelectRestriction() const;
+	[[nodiscard]] Element *lookupItemByY(int y) const;
 
 	[[nodiscard]] std::pair<Element*, int> findViewForPinnedTracking(
 		int top) const;