Added history view LambdaGenericPart.

Telegram/SourceFiles/history/view/media/history_view_media_generic.cpp

@@ -391,6 +391,35 @@ QSize TextDelimeterPart::countCurrentSize(int newWidth) {
 	return { newWidth, minHeight() };
 }
 
+LambdaGenericPart::LambdaGenericPart(
+	QSize size,
+	Fn<void(
+		Painter &p,
+		not_null<const MediaGeneric*> owner,
+		const PaintContext &context,
+		int outerWidth)> draw)
+: _size(size)
+, _draw(std::move(draw)) {
+}
+
+void LambdaGenericPart::draw(
+		Painter &p,
+		not_null<const MediaGeneric*> owner,
+		const PaintContext &context,
+		int outerWidth) const {
+	if (_draw) {
+		_draw(p, owner, context, outerWidth);
+	}
+}
+
+QSize LambdaGenericPart::countOptimalSize() {
+	return _size;
+}
+
+QSize LambdaGenericPart::countCurrentSize(int newWidth) {
+	return { newWidth, _size.height() };
+}
+
 StickerInBubblePart::StickerInBubblePart(
 	not_null<Element*> parent,
 	Element *replacing,

Telegram/SourceFiles/history/view/media/history_view_media_generic.h

@@ -194,6 +194,35 @@ private:
 
 };
 
+class LambdaGenericPart final : public MediaGenericPart {
+public:
+	LambdaGenericPart(
+		QSize size,
+		Fn<void(
+			Painter &p,
+			not_null<const MediaGeneric*> owner,
+			const PaintContext &context,
+			int outerWidth)> draw);
+
+	void draw(
+		Painter &p,
+		not_null<const MediaGeneric*> owner,
+		const PaintContext &context,
+		int outerWidth) const override;
+
+	QSize countOptimalSize() override;
+	QSize countCurrentSize(int newWidth) override;
+
+private:
+	QSize _size;
+	Fn<void(
+		Painter &p,
+		not_null<const MediaGeneric*> owner,
+		const PaintContext &context,
+		int outerWidth)> _draw;
+
+};
+
 class StickerInBubblePart final : public MediaGenericPart {
 public:
 	struct Data {