Handle click on group thumb item in MediaView.

Telegram/SourceFiles/media/view/media_view_group_thumbs.cpp

@@ -105,7 +105,7 @@ public:
 		Dying,
 	};
 
-	Thumb(Key key, ImagePtr image);
+	Thumb(Key key, ImagePtr image, base::lambda<void()> handler);
 
 	int leftToUpdate() const;
 	int rightToUpdate() const;
@@ -118,6 +118,7 @@ public:
 	bool removed() const;
 
 	void paint(Painter &p, int x, int y, int outerWidth, float64 progress);
+	ClickHandlerPtr getState(QPoint point) const;
 
 private:
 	QSize wantedPixSize() const;
@@ -126,30 +127,33 @@ private:
 	int currentWidth() const;
 	int finalLeft() const;
 	int finalWidth() const;
-	void toggle(bool visible);
 	void animateTo(int left, int width);
 
+	ClickHandlerPtr _link;
 	const Key _key;
 	ImagePtr _image;
 	State _state = State::Alive;
 	QPixmap _full;
 	int _fullWidth = 0;
-	bool _hiding = true;
+	bool _hiding = false;
 
 	anim::value _left = { 0. };
 	anim::value _width = { 0. };
-	anim::value _opacity = { 0. };
+	anim::value _opacity = { 0., 1. };
 
 };
 
-GroupThumbs::Thumb::Thumb(Key key, ImagePtr image)
+GroupThumbs::Thumb::Thumb(
+	Key key,
+	ImagePtr image,
+	base::lambda<void()> handler)
 : _key(key)
 , _image(image) {
+	_link = std::make_shared<LambdaClickHandler>(std::move(handler));
 	_fullWidth = std::min(
 		wantedPixSize().width(),
 		st::mediaviewGroupWidthMax);
 	validateImage();
-	toggle(true);
 }
 
 QSize GroupThumbs::Thumb::wantedPixSize() const {
@@ -229,23 +233,21 @@ void GroupThumbs::Thumb::setState(State state) {
 			_left = anim::value(-_fullWidth / 2);
 			_width = anim::value(_fullWidth);
 		} else {
-			toggle(true);
+			_opacity.start(1.);
 		}
+		_hiding = false;
 		animateTo(-_fullWidth / 2, _fullWidth);
 	} else if (_state == State::Alive) {
-		toggle(true);
+		_opacity.start(0.7);
+		_hiding = false;
 	} else if (_state == State::Dying) {
-		toggle(false);
+		_opacity.start(0.);
+		_hiding = true;
 		_left.restart();
 		_width.restart();
 	}
 }
 
-void GroupThumbs::Thumb::toggle(bool visible) {
-	_hiding = !visible;
-	_opacity.start(_hiding ? 0. : 1.);
-}
-
 void GroupThumbs::Thumb::animateTo(int left, int width) {
 	_left.start(left);
 	_width.start(width);
@@ -324,6 +326,17 @@ void GroupThumbs::Thumb::paint(
 	p.setOpacity(opacity);
 }
 
+ClickHandlerPtr GroupThumbs::Thumb::getState(QPoint point) const {
+	if (_state != State::Alive) {
+		return nullptr;
+	}
+	const auto left = finalLeft();
+	const auto width = finalWidth();
+	return QRect(left, 0, width, st::mediaviewGroupHeight).contains(point)
+		? _link
+		: nullptr;
+}
+
 GroupThumbs::GroupThumbs(Context context)
 : _context(context) {
 }
@@ -486,7 +499,12 @@ auto GroupThumbs::createThumb(Key key) -> std::unique_ptr<Thumb> {
 
 auto GroupThumbs::createThumb(Key key, ImagePtr image)
 -> std::unique_ptr<Thumb> {
-	return std::make_unique<Thumb>(key, image);
+	const auto weak = base::make_weak(this);
+	return std::make_unique<Thumb>(key, image, [=] {
+		if (const auto strong = weak.get()) {
+			strong->_activateStream.fire_copy(key);
+		}
+	});
 }
 
 auto GroupThumbs::validateCacheEntry(Key key) -> not_null<Thumb*> {
@@ -597,6 +615,16 @@ void GroupThumbs::paint(
 	}
 }
 
+ClickHandlerPtr GroupThumbs::getState(QPoint point) const {
+	point -= QPoint((_width / 2), st::mediaviewGroupPadding.top());
+	for (const auto &[key, thumb] : _cache) {
+		if (auto link = thumb->getState(point)) {
+			return link;
+		}
+	}
+	return nullptr;
+}
+
 void GroupThumbs::countUpdatedRect() {
 	if (_cache.empty()) {
 		return;

Telegram/SourceFiles/media/view/media_view_group_thumbs.h

@@ -21,6 +21,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #pragma once
 
 #include "history/history_item_components.h"
+#include "base/weak_ptr.h"
 
 class SharedMediaWithLastSlice;
 class UserPhotosSlice;
@@ -28,8 +29,10 @@ class UserPhotosSlice;
 namespace Media {
 namespace View {
 
-class GroupThumbs {
+class GroupThumbs : public base::has_weak_ptr {
 public:
+	using Key = base::variant<PhotoId, FullMsgId>;
+
 	static void Refresh(
 		std::unique_ptr<GroupThumbs> &instance,
 		const SharedMediaWithLastSlice &slice,
@@ -49,17 +52,21 @@ public:
 	void checkForAnimationStart();
 
 	void paint(Painter &p, int x, int y, int outerWidth, TimeMs ms);
+	ClickHandlerPtr getState(QPoint point) const;
 
 	rpl::producer<QRect> updateRequests() const {
 		return _updateRequests.events();
 	}
 
+	rpl::producer<Key> activateRequests() const {
+		return _activateStream.events();
+	}
+
 	rpl::lifetime &lifetime() {
 		return _lifetime;
 	}
 
 	using Context = base::optional_variant<PeerId, MessageGroupId>;
-	using Key = base::variant<PhotoId, FullMsgId>;
 
 	GroupThumbs(Context context);
 	~GroupThumbs();
@@ -98,11 +105,12 @@ private:
 	base::flat_map<Key, std::unique_ptr<Thumb>> _cache;
 	int _width = 0;
 	int _limit = 0;
-	rpl::event_stream<QRect> _updateRequests;
-	rpl::lifetime _lifetime;
-
 	QRect _updatedRect;
 
+	rpl::event_stream<QRect> _updateRequests;
+	rpl::event_stream<Key> _activateStream;
+	rpl::lifetime _lifetime;
+
 };
 
 } // namespace View

Telegram/SourceFiles/mediaview.cpp

@@ -1288,6 +1288,13 @@ void MediaView::refreshGroupThumbs() {
 		_groupThumbs->resizeToWidth(_groupThumbsAvailableWidth);
 	}
 	if (_groupThumbs && !existed) {
+		initGroupThumbs();
+	}
+}
+
+void MediaView::initGroupThumbs() {
+	Expects(_groupThumbs != nullptr);
+
 	_groupThumbs->updateRequests(
 	) | rpl::start_with_next([this](QRect rect) {
 		const auto shift = (width() / 2);
@@ -1298,12 +1305,22 @@ void MediaView::refreshGroupThumbs() {
 			_groupThumbs->height());
 		update(_groupThumbsRect);
 	}, _groupThumbs->lifetime());
+
+	_groupThumbs->activateRequests(
+	) | rpl::start_with_next([this](Media::View::GroupThumbs::Key key) {
+		if (const auto photoId = base::get_if<PhotoId>(&key)) {
+			const auto photo = App::photo(*photoId);
+			moveToEntity({ photo, nullptr });
+		} else if (const auto itemId = base::get_if<FullMsgId>(&key)) {
+			moveToEntity(entityForItemId(*itemId));
+		}
+	}, _groupThumbs->lifetime());
+
 	_groupThumbsRect = QRect(
 		_groupThumbsLeft,
 		_groupThumbsTop,
 		width() - 2 * _groupThumbsLeft,
 		height() - _groupThumbsTop);
-	}
 }
 
 void MediaView::showPhoto(not_null<PhotoData*> photo, HistoryItem *context) {
@@ -2421,7 +2438,13 @@ MediaView::Entity MediaView::entityForSharedMedia(int index) const {
 		// Last peer photo.
 		return { *photo, nullptr };
 	} else if (const auto itemId = base::get_if<FullMsgId>(&value)) {
-		if (const auto item = App::histItemById(*itemId)) {
+		return entityForItemId(*itemId);
+	}
+	return { base::none, nullptr };
+}
+
+MediaView::Entity MediaView::entityForItemId(const FullMsgId &itemId) const {
+	if (const auto item = App::histItemById(itemId)) {
 		if (const auto media = item->getMedia()) {
 			if (const auto photo = media->getPhoto()) {
 				return { photo, item };
@@ -2431,7 +2454,6 @@ MediaView::Entity MediaView::entityForSharedMedia(int index) const {
 		}
 		return { base::none, item };
 	}
-	}
 	return { base::none, nullptr };
 }
 
@@ -2481,12 +2503,14 @@ bool MediaView::moveToNext(int delta) {
 		return false;
 	}
 	auto newIndex = *_index + delta;
-	auto entity = entityByIndex(newIndex);
+	return moveToEntity(entityByIndex(newIndex));
+}
+
+bool MediaView::moveToEntity(const Entity &entity, int preloadDelta) {
 	if (!entity.data && !entity.item) {
 		return false;
 	}
-	_index = newIndex;
+	if (const auto item = entity.item) {
-	if (auto item = entity.item) {
 		setContext(item);
 	} else if (_peer) {
 		setContext(_peer);
@@ -2501,7 +2525,7 @@ bool MediaView::moveToNext(int delta) {
 	} else {
 		displayDocument(nullptr, entity.item);
 	}
-	preloadData(delta);
+	preloadData(preloadDelta);
 	return true;
 }
 
@@ -2695,8 +2719,13 @@ void MediaView::updateOver(QPoint pos) {
 		auto textState = _caption.getState(pos - _captionRect.topLeft(), _captionRect.width());
 		lnk = textState.link;
 		lnkhost = this;
+	} else if (_groupThumbs && _groupThumbsRect.contains(pos)) {
+		const auto point = pos - QPoint(_groupThumbsLeft, _groupThumbsTop);
+		lnk = _groupThumbs->getState(point);
+		lnkhost = this;
 	}
 
+
 	// retina
 	if (pos.x() == width()) {
 		pos.setX(pos.x() - 1);

Telegram/SourceFiles/mediaview.h

@@ -161,6 +161,8 @@ private:
 	Entity entityForUserPhotos(int index) const;
 	Entity entityForSharedMedia(int index) const;
 	Entity entityByIndex(int index) const;
+	Entity entityForItemId(const FullMsgId &itemId) const;
+	bool moveToEntity(const Entity &entity, int preloadDelta = 0);
 	void setContext(base::optional_variant<
 		not_null<HistoryItem*>,
 		not_null<PeerData*>> context);
@@ -250,8 +252,8 @@ private:
 	bool updateOverState(OverState newState);
 	float64 overLevel(OverState control) const;
 
-	QRect groupThumbsFullRect() const;
 	void checkGroupThumbsAnimation();
+	void initGroupThumbs();
 
 	QBrush _transparentBrush;