Added ability to set custom animation duration for MediaPreviewWidget.

Telegram/SourceFiles/window/window_media_preview.cpp

@@ -243,7 +243,10 @@ void MediaPreviewWidget::startShow() {
 				Window::GifPauseReason::MediaPreview);
 		}
 		_hiding = false;
-		_a_shown.start([=] { update(); }, 0., 1., st::stickerPreviewDuration);
+		const auto duration = _customDuration
+			? _customDuration
+			: st::stickerPreviewDuration;
+		_a_shown.start([=] { update(); }, 0., 1., duration);
 	} else {
 		update();
 	}
@@ -257,7 +260,10 @@ void MediaPreviewWidget::hidePreview() {
 		_cache = currentImage();
 	}
 	_hiding = true;
-	_a_shown.start([=] { update(); }, 1., 0., st::stickerPreviewDuration);
+	const auto duration = _customDuration
+		? _customDuration
+		: st::stickerPreviewDuration;
+	_a_shown.start([=] { update(); }, 1., 0., duration);
 	_photo = nullptr;
 	_photoMedia = nullptr;
 	_document = nullptr;
@@ -309,6 +315,10 @@ void MediaPreviewWidget::setCustomRadius(int radius) {
 	update();
 }
 
+void MediaPreviewWidget::setCustomDuration(crl::time duration) {
+	_customDuration = duration;
+}
+
 QSize MediaPreviewWidget::currentDimensions() const {
 	if (!_cachedSize.isEmpty()) {
 		return _cachedSize;

Telegram/SourceFiles/window/window_media_preview.h

@@ -41,6 +41,7 @@ public:
 	void setCustomPadding(const QMargins &padding = QMargins());
 	void setBackgroundMargins(const QMargins &margins = QMargins());
 	void setCustomRadius(int radius);
+	void setCustomDuration(crl::time duration);
 
 	~MediaPreviewWidget();
 
@@ -93,6 +94,7 @@ private:
 	QMargins _customPadding;
 	QMargins _backgroundMargins;
 	int _customRadius = 0;
+	crl::time _customDuration = 0;
 
 };