Added slide animation for chats filter switching.

Telegram/SourceFiles/dialogs/dialogs_widget.cpp

@@ -41,6 +41,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/wrap/vertical_layout.h"
 #include "ui/effects/radial_animation.h"
 #include "ui/effects/ripple_animation.h"
+#include "ui/effects/slide_animation.h"
 #include "ui/chat/requests_bar.h"
 #include "ui/chat/group_call_bar.h"
 #include "ui/chat/more_chats_bar.h"
@@ -447,6 +448,10 @@ Widget::Widget(
 			_childListPeerId.value(),
 			_childListShown.value(),
 			makeChildListShown)));
+	controller->activeChatsFilter(
+	) | rpl::on_next([=](FilterId id) {
+		switchToChatsFilter(id);
+	}, lifetime());
 	rpl::combine(
 		_scroll->heightValue(),
 		_topBarSuggestionHeightChanged.events_starting_with(0)
@@ -953,7 +958,9 @@ void Widget::setupSwipeBack() {
 			if (CheckAndJumpToNearChatsFilter(controller(), next, false)) {
 				return Ui::Controls::DefaultSwipeBackHandlerFinishData([=] {
 					_swipeBackData = {};
+					_chatsFilterSwipeSwitch = true;
 					CheckAndJumpToNearChatsFilter(controller(), next, true);
+					_chatsFilterSwipeSwitch = false;
 				});
 			}
 		}
@@ -2052,9 +2059,10 @@ void Widget::toggleFiltersMenu(bool enabled) {
 			_chatFilters.get(),
 			&session(),
 			[this](FilterId id) {
-				_scroll->scrollToY(0);
 				if (controller()->activeChatsFilterCurrent() != id) {
 					controller()->setActiveChatsFilter(id);
+				} else {
+					_scroll->scrollToY(0);
 				}
 			},
 			Window::GifPauseReason::Any,
@@ -2246,6 +2254,7 @@ void Widget::changeOpenedSubsection(
 	if (isHidden()) {
 		animated = anim::type::instant;
 	}
+	_chatsFilterSlideCanvas = nullptr;
 	auto oldContentCache = QPixmap();
 	const auto showDirection = fromRight
 		? Window::SlideDirection::FromRight
@@ -2519,6 +2528,84 @@ void Widget::showSearchInTopBar(anim::type animated) {
 	updateForceDisplayWide();
 }
 
+void Widget::switchToChatsFilter(FilterId id) {
+	const auto was = _inner->filterId();
+	const auto animated = (was != id)
+		&& !isHidden()
+		&& !_showAnimation
+		&& (_chatsFilterSwipeSwitch
+			|| (_chatFilters && !_chatFilters->isHidden()));
+	if (!animated) {
+		_inner->switchToFilter(id);
+		return;
+	}
+	const auto &list = session().data().chatsFilters().list();
+	const auto indexOf = [&](FilterId filterId) {
+		return int(ranges::find(list, filterId, &Data::ChatFilter::id)
+			- begin(list));
+	};
+	const auto slideLeft = (indexOf(id) < indexOf(was));
+	const auto duration = _chatsFilterSwipeSwitch
+		? st::dialogsFilterSwipeSlideDuration
+		: st::slideDuration;
+	_chatsFilterSlideCanvas = nullptr;
+	auto wasCache = grabForChatsFilterSlide();
+	_inner->switchToFilter(id);
+	if (_inner->filterId() == was) {
+		return;
+	}
+	startChatsFilterSlide(
+		std::move(wasCache),
+		grabForChatsFilterSlide(),
+		slideLeft,
+		duration);
+}
+
+QPixmap Widget::grabForChatsFilterSlide() {
+	const auto hidden = _scrollToTop->isHidden();
+	if (!hidden) {
+		_scrollToTop->hide();
+	}
+	auto result = Ui::GrabOpaque(
+		_scroll.data(),
+		_scroll->rect(),
+		st::dialogsBg->c);
+	if (!hidden) {
+		_scrollToTop->show();
+	}
+	return result;
+}
+
+void Widget::startChatsFilterSlide(
+		QPixmap wasCache,
+		QPixmap nowCache,
+		bool slideLeft,
+		crl::time duration) {
+	_chatsFilterSlideCanvas = std::make_unique<Ui::RpWidget>(this);
+	const auto canvas = _chatsFilterSlideCanvas.get();
+	canvas->setAttribute(Qt::WA_TransparentForMouseEvents);
+	canvas->setAttribute(Qt::WA_OpaquePaintEvent);
+	canvas->setGeometry(_scroll->geometry());
+	const auto animation
+		= canvas->lifetime().make_state<Ui::SlideAnimation>();
+	animation->setSnapshots(std::move(wasCache), std::move(nowCache));
+	canvas->paintOn([=](QPainter &p) {
+		p.fillRect(canvas->rect(), st::dialogsBg);
+		animation->paintFrame(p, 0, 0, canvas->width());
+	});
+	canvas->show();
+	if (_connecting) {
+		_connecting->raise();
+	}
+	animation->start(slideLeft, [=] {
+		if (animation->animating()) {
+			canvas->update();
+		} else {
+			_chatsFilterSlideCanvas = nullptr;
+		}
+	}, duration);
+}
+
 QPixmap Widget::grabForFolderSlideAnimation() {
 	const auto hidden = _scrollToTop->isHidden();
 	if (!hidden) {
@@ -2832,6 +2919,7 @@ void Widget::showAnimated(
 		Window::SlideDirection direction,
 		const Window::SectionSlideParams &params) {
 	_showAnimation = nullptr;
+	_chatsFilterSlideCanvas = nullptr;
 
 	auto oldContentCache = params.oldContentCache;
 	showFast();
@@ -4607,6 +4695,9 @@ void Widget::updateControlsGeometry() {
 		const auto scrollHeight = height() - scrollTop - bottomSkip;
 		const auto wasScrollHeight = _scroll->height();
 		_scroll->setGeometry(0, scrollTop, scrollWidth, scrollHeight);
+		if (_chatsFilterSlideCanvas) {
+			_chatsFilterSlideCanvas->setGeometry(_scroll->geometry());
+		}
 		if (scrollHeight != wasScrollHeight) {
 			controller()->floatPlayerAreaUpdated();
 		}