Generate album mini previews with up-to-three images.

Telegram/SourceFiles/data/data_groups.cpp

@@ -7,7 +7,9 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "data/data_groups.h"
 
+#include "history/history.h"
 #include "history/history_item.h"
+#include "dialogs/ui/dialogs_message_view.h"
 #include "data/data_media_types.h"
 #include "data/data_session.h"
 
@@ -140,8 +142,13 @@ const Group *Groups::find(not_null<const HistoryItem*> item) const {
 }
 
 void Groups::refreshViews(const HistoryItemsList &items) {
+	if (items.empty()) {
+		return;
+	}
+	const auto history = items.front()->history();
 	for (const auto &item : items) {
 		_data->requestItemViewRefresh(item);
+		history->lastItemDialogsView.itemInvalidated(item);
 	}
 }
 

Telegram/SourceFiles/data/data_groups.h

@@ -15,7 +15,6 @@ class Session;
 
 struct Group {
 	HistoryItemsList items;
-
 };
 
 class Groups {

Telegram/SourceFiles/data/data_media_types.cpp

@@ -60,6 +60,7 @@ namespace Data {
 namespace {
 
 constexpr auto kFastRevokeRestriction = 24 * 60 * TimeId(60);
+constexpr auto kMaxPreviewImages = 3;
 
 using ItemPreview = HistoryView::ItemPreview;
 
@@ -406,6 +407,52 @@ std::unique_ptr<HistoryView::Media> Media::createView(
 	return createView(message, message->data(), replacing);
 }
 
+ItemPreview Media::toGroupPreview(
+		const HistoryItemsList &items,
+		ToPreviewOptions options) const {
+	const auto genericText = textcmdLink(
+		1,
+		TextUtilities::Clean(tr::lng_in_dlg_album(tr::now)));
+	auto result = ItemPreview();
+	auto loadingContext = std::vector<std::any>();
+	for (const auto &item : items) {
+		if (const auto media = item->media()) {
+			auto copy = options;
+			copy.ignoreGroup = true;
+			const auto already = int(result.images.size());
+			const auto left = kMaxPreviewImages - already;
+			auto single = left ? media->toPreview(copy) : ItemPreview();
+			if (!single.images.empty()) {
+				while (single.images.size() > left) {
+					single.images.pop_back();
+				}
+				result.images.insert(
+					end(result.images),
+					std::make_move_iterator(begin(single.images)),
+					std::make_move_iterator(end(single.images)));
+			}
+			if (single.loadingContext.has_value()) {
+				loadingContext.push_back(std::move(single.loadingContext));
+			}
+			const auto original = item->originalText().text;
+			if (!original.isEmpty()) {
+				if (result.text.isEmpty()) {
+					result.text = TextUtilities::Clean(original);
+				} else {
+					result.text = genericText;
+				}
+			}
+		}
+	}
+	if (result.text.isEmpty()) {
+		result.text = genericText;
+	}
+	if (!loadingContext.empty()) {
+		result.loadingContext = std::move(loadingContext);
+	}
+	return result;
+}
+
 MediaPhoto::MediaPhoto(
 	not_null<HistoryItem*> parent,
 	not_null<PhotoData*> photo)
@@ -478,11 +525,17 @@ QString MediaPhoto::notificationText() const {
 }
 
 ItemPreview MediaPhoto::toPreview(ToPreviewOptions options) const {
+	const auto item = parent();
+	if (!options.ignoreGroup && item->groupId()) {
+		if (const auto group = item->history()->owner().groups().find(item)
+			; group && group->items.size() > 1) {
+			return toGroupPreview(group->items, options);
+		}
+	}
 	const auto caption = options.hideCaption
 		? QString()
 		: parent()->originalText().text;
 	auto images = std::vector<QImage>();
-	// #TODO minis support albums
 	const auto media = _photo->createMediaView();
 	const auto radius = _chat
 		? ImageRoundRadius::Ellipse
@@ -666,6 +719,13 @@ bool MediaFile::replyPreviewLoaded() const {
 }
 
 ItemPreview MediaFile::toPreview(ToPreviewOptions options) const {
+	const auto item = parent();
+	if (!options.ignoreGroup && item->groupId()) {
+		if (const auto group = item->history()->owner().groups().find(item)
+			; group && group->items.size() > 1) {
+			return toGroupPreview(group->items, options);
+		}
+	}
 	if (const auto sticker = _document->sticker()) {
 		return Media::toPreview(options);
 	}
@@ -690,7 +750,6 @@ ItemPreview MediaFile::toPreview(ToPreviewOptions options) const {
 	const auto caption = options.hideCaption
 		? QString()
 		: parent()->originalText().text;
-	// #TODO minis support albums
 	auto images = std::vector<QImage>();
 	const auto media = TryFilePreview(_document)
 		? _document->createMediaView()

Telegram/SourceFiles/data/data_media_types.h

@@ -127,6 +127,11 @@ public:
 		not_null<HistoryView::Element*> message,
 		HistoryView::Element *replacing = nullptr);
 
+protected:
+	[[nodiscard]] ItemPreview toGroupPreview(
+		const HistoryItemsList &items,
+		ToPreviewOptions options) const;
+
 private:
 	const not_null<HistoryItem*> _parent;
 

Telegram/SourceFiles/dialogs/ui/dialogs_message_view.cpp

@@ -78,7 +78,8 @@ struct MessageView::LoadingContext {
 };
 
 MessageView::MessageView()
-: _textCache(st::dialogsTextWidthMin) {
+: _senderCache(st::dialogsTextWidthMin)
+, _textCache(st::dialogsTextWidthMin) {
 }
 
 MessageView::~MessageView() = default;
@@ -111,6 +112,8 @@ void MessageView::paint(
 				preview.text.mid(0, preview.imagesInTextPosition).trimmed(),
 				DialogTextOptions());
 			preview.text = preview.text.mid(preview.imagesInTextPosition);
+		} else {
+			_senderCache = { st::dialogsTextWidthMin };
 		}
 		_textCache.setText(
 			st::dialogsTextStyle,

Telegram/SourceFiles/history/history_item.cpp

@@ -205,14 +205,14 @@ void HistoryItem::applyServiceDateEdition(const MTPDmessageService &data) {
 }
 
 void HistoryItem::finishEdition(int oldKeyboardTop) {
-	_history->owner().requestItemViewRefresh(this);
-	invalidateChatListEntry();
 	if (const auto group = _history->owner().groups().find(this)) {
-		const auto leader = group->items.front();
-		if (leader != this) {
-			_history->owner().requestItemViewRefresh(leader);
-			leader->invalidateChatListEntry();
+		for (const auto &item : group->items) {
+			_history->owner().requestItemViewRefresh(item);
+			item->invalidateChatListEntry();
 		}
+	} else {
+		_history->owner().requestItemViewRefresh(this);
+		invalidateChatListEntry();
 	}
 
 	// Should be completely redesigned as the oldTop no longer exists.
@@ -942,14 +942,6 @@ QString HistoryItem::notificationText() const {
 ItemPreview HistoryItem::toPreview(ToPreviewOptions options) const {
 	auto result = [&]() -> ItemPreview {
 		if (_media) {
-			if (_groupId) {
-				// #TODO minis generate albums correctly
-				return {
-					.text = textcmdLink(
-						1,
-						TextUtilities::Clean(tr::lng_in_dlg_album(tr::now))),
-				};
-			}
 			return _media->toPreview(options);
 		} else if (!emptyText()) {
 			return { .text = TextUtilities::Clean(_text.toString()) };

Telegram/SourceFiles/history/history_item.h

@@ -61,6 +61,7 @@ struct ToPreviewOptions {
 	bool hideSender = false;
 	bool hideCaption = false;
 	bool generateImages = true;
+	bool ignoreGroup = false;
 };
 
 struct ItemPreview {