Support single download file thumbnail display.

Telegram/SourceFiles/data/data_download_manager.cpp

@@ -10,9 +10,11 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_session.h"
 #include "data/data_photo.h"
 #include "data/data_document.h"
+#include "data/data_document_media.h"
 #include "data/data_changes.h"
 #include "data/data_user.h"
 #include "data/data_channel.h"
+#include "data/data_file_origin.h"
 #include "base/unixtime.h"
 #include "base/random.h"
 #include "main/main_session.h"
@@ -846,26 +848,99 @@ rpl::producer<Ui::DownloadBarProgress> MakeDownloadBarProgress() {
 }
 
 rpl::producer<Ui::DownloadBarContent> MakeDownloadBarContent() {
+	return [](auto consumer) {
+		auto lifetime = rpl::lifetime();
+
+		struct State {
+			DocumentData *document = nullptr;
+			std::shared_ptr<Data::DocumentMedia> media;
+			rpl::lifetime downloadTaskLifetime;
+			QImage thumbnail;
+			Fn<void()> push;
+		};
+
+		const auto state = lifetime.make_state<State>();
 		auto &manager = Core::App().downloadManager();
-	return rpl::single(
-		rpl::empty_value()
-	) | rpl::then(
-		manager.loadingListChanges() | rpl::to_empty
-	) | rpl::map([=, &manager] {
-		auto result = Ui::DownloadBarContent();
-		for (const auto id : manager.loadingList()) {
-			if (result.singleName.text.isEmpty()) {
-				const auto document = id->object.document;
-				result.singleName = Ui::Text::FormatDownloadsName(document);
-				result.singleThumbnail = QImage();
+
+		const auto resolveThumbnailRecursive = [=](auto &&self) -> bool {
+			if (state->document
+				&& (!state->document->hasThumbnail()
+					|| state->document->thumbnailFailed())) {
+				state->media = nullptr;
 			}
-			++result.count;
-			if (id->done) {
-				++result.done;
+			if (!state->media) {
+				state->downloadTaskLifetime.destroy();
+				if (!state->thumbnail.isNull()) {
+					return false;
 				}
+				state->thumbnail = QImage();
+				return true;
 			}
-		return result;
+			if (const auto image = state->media->thumbnail()) {
+				state->thumbnail = image->original();
+				state->downloadTaskLifetime.destroy();
+				state->media = nullptr;
+				return true;
+			} else if (const auto embed = state->media->thumbnailInline()) {
+				if (!state->thumbnail.isNull()) {
+					return false;
+				}
+				state->thumbnail = Images::Prepare(embed->original(), 0, {
+					.options = Images::Option::Blur,
 				});
+			}
+			state->document->session().downloaderTaskFinished(
+			) | rpl::filter([=] {
+				return self(self);
+			}) | rpl::start_with_next(
+				state->push,
+				state->downloadTaskLifetime);
+			return !state->thumbnail.isNull();
+		};
+		const auto resolveThumbnail = [=] {
+			return resolveThumbnailRecursive(resolveThumbnailRecursive);
+		};
+
+		state->push = [=, &manager] {
+			auto content = Ui::DownloadBarContent();
+			auto single = (const Data::DownloadObject*) nullptr;
+			for (const auto id : manager.loadingList()) {
+				if (!single) {
+					single = &id->object;
+				}
+				++content.count;
+				if (id->done) {
+					++content.done;
+				}
+			}
+			if (content.count == 1) {
+				const auto document = single->document;
+				const auto thumbnailed = (single->item
+					&& document->hasThumbnail())
+					? document
+					: nullptr;
+				if (state->document != thumbnailed) {
+					state->document = thumbnailed;
+					state->media = thumbnailed
+						? thumbnailed->createMediaView()
+						: nullptr;
+					state->media->thumbnailWanted(single->item->fullId());
+					state->thumbnail = QImage();
+					resolveThumbnail();
+				}
+				content.singleName = Ui::Text::FormatDownloadsName(
+					document);
+				content.singleThumbnail = state->thumbnail;
+			}
+			consumer.put_next(std::move(content));
+		};
+
+		manager.loadingListChanges(
+		) | rpl::start_with_next(state->push, lifetime);
+
+		state->push();
+		return lifetime;
+	};
 }
 
 } // namespace Data

Telegram/SourceFiles/dialogs/dialogs_widget.cpp

@@ -1910,6 +1910,9 @@ void Widget::onDialogMoved(int movedFrom, int movedTo) {
 
 Widget::~Widget() {
 	cancelSearchRequest();
+
+	// Destructor may hide the bar and attempt to double-destroy it.
+	base::take(_downloadBar);
 }
 
 } // namespace Dialogs

Telegram/SourceFiles/ui/controls/download_bar.cpp

@@ -10,6 +10,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/widgets/buttons.h"
 #include "ui/text/format_values.h"
 #include "ui/text/text_utilities.h"
+#include "ui/image/image_prepare.h"
 #include "lang/lang_keys.h"
 #include "styles/style_dialogs.h"
 
@@ -18,6 +19,17 @@ namespace {
 
 constexpr auto kFullArcLength = 360 * 16;
 
+[[nodiscard]] QImage Make(const QImage &image, int size) {
+	if (image.isNull()) {
+		return QImage();
+	}
+	auto result = image.scaledToWidth(
+		size * style::DevicePixelRatio(),
+		Qt::SmoothTransformation);
+	result.setDevicePixelRatio(style::DevicePixelRatio());
+	return result;
+}
+
 } // namespace
 
 DownloadBar::DownloadBar(
@@ -71,6 +83,7 @@ void DownloadBar::show(DownloadBarContent &&content) {
 			_finished ? 1. : 0.,
 			st::widgetFadeDuration);
 	}
+	refreshThumbnail();
 	_title.setMarkedText(
 		st::defaultTextStyle,
 		(content.count > 1
@@ -80,19 +93,47 @@ void DownloadBar::show(DownloadBarContent &&content) {
 	refreshInfo(_progress.current());
 }
 
+void DownloadBar::refreshThumbnail() {
+	if (_content.singleThumbnail.isNull()) {
+		_thumbnail = _thumbnailDone = QImage();
+		_thumbnailCacheKey = 0;
+		return;
+	}
+	const auto cacheKey = _content.singleThumbnail.cacheKey();
+	if (_thumbnailCacheKey == cacheKey) {
+		return;
+	}
+	_thumbnailCacheKey = cacheKey;
+	_thumbnailLarge = _content.singleThumbnail;
+	_thumbnailLarge.detach();
+	const auto width = _thumbnailLarge.width();
+	const auto height = _thumbnailLarge.height();
+	if (width != height) {
+		const auto size = std::min(width, height);
+		_thumbnailLarge = _thumbnailLarge.copy(
+			(width - size) / 2,
+			(height - size) / 2,
+			size,
+			size);
+	}
+	const auto size = st::downloadLoadingSize;
+	const auto added = 3 * st::downloadLoadingLine;
+	const auto loadingsize = size;
+	const auto donesize = size + (added - st::downloadLoadingLine) * 2;
+	const auto make = [&](int size) {
+		return Images::Circle(Make(_thumbnailLarge, size));
+	};
+	_thumbnail = make(loadingsize);
+	_thumbnailDone = make(donesize);
+	_thumbnailLarge = Images::Circle(std::move(_thumbnailLarge));
+}
+
 void DownloadBar::refreshIcon() {
-	_documentIconOriginal = st::downloadIconDocument.instance(
+	_documentIconLarge = st::downloadIconDocument.instance(
 		st::windowFgActive->c,
 		style::kScaleMax / style::DevicePixelRatio());
-	const auto make = [&](int size) {
-		auto result = _documentIconOriginal.scaledToWidth(
-			size * style::DevicePixelRatio(),
-			Qt::SmoothTransformation);
-		result.setDevicePixelRatio(style::DevicePixelRatio());
-		return result;
-	};
-	_documentIcon = make(st::downloadIconSize);
-	_documentIconDone = make(st::downloadIconSizeDone);
+	_documentIcon = Make(_documentIconLarge, st::downloadIconSize);
+	_documentIconDone = Make(_documentIconLarge, st::downloadIconSizeDone);
 }
 
 void DownloadBar::refreshInfo(const DownloadBarProgress &progress) {
@@ -156,17 +197,10 @@ void DownloadBar::paint(Painter &p, QRect clip) {
 		size + added * 2,
 		size + added * 2);
 	if (full.intersects(clip)) {
+		const auto done = (finished == 1.);
 		const auto loading = _radial.computeState();
-		{
-			auto hq = PainterHighQualityEnabler(p);
-			p.setPen(Qt::NoPen);
-			p.setBrush(st::windowBgActive);
-			const auto shift = st::downloadLoadingLine
-				+ (1. - finished) * (added - st::downloadLoadingLine);
-			p.drawEllipse(QRectF(full).marginsRemoved(
-				{ shift, shift, shift, shift }));
-
 		if (loading.shown > 0) {
+			auto hq = PainterHighQualityEnabler(p);
 			p.setOpacity(loading.shown);
 			auto pen = st::windowBgActive->p;
 			pen.setWidth(st::downloadLoadingLine);
@@ -181,16 +215,25 @@ void DownloadBar::paint(Painter &p, QRect clip) {
 			}
 			p.setOpacity(1.);
 		}
-		}
+		const auto shift = st::downloadLoadingLine
+			+ (1. - finished) * (added - st::downloadLoadingLine);
+		const auto ellipse = QRectF(full).marginsRemoved(
+			{ shift, shift, shift, shift });
+		if (_thumbnail.isNull()) {
+			auto hq = PainterHighQualityEnabler(p);
+			p.setPen(Qt::NoPen);
+			p.setBrush(st::windowBgActive);
+			p.drawEllipse(ellipse);
 			const auto sizeLoading = st::downloadIconSize;
-		if (finished == 0. || finished == 1.) {
-			const auto size = (finished == 1.)
+			if (finished == 0. || done) {
+				const auto size = done
 					? st::downloadIconSizeDone
 					: sizeLoading;
+				const auto image = done ? _documentIconDone : _documentIcon;
 				p.drawImage(
 					full.x() + (full.width() - size) / 2,
 					full.y() + (full.height() - size) / 2,
-				(finished == 1.) ? _documentIconDone : _documentIcon);
+					image);
 			} else {
 				auto hq = PainterHighQualityEnabler(p);
 				const auto size = sizeLoading
@@ -201,7 +244,16 @@ void DownloadBar::paint(Painter &p, QRect clip) {
 						full.y() + (full.height() - size) / 2.,
 						size,
 						size),
-				_documentIconOriginal);
+					_documentIconLarge);
+			}
+		} else if (finished == 0. || done) {
+			p.drawImage(
+				base::SafeRound(ellipse.x()),
+				base::SafeRound(ellipse.y()),
+				done ? _thumbnailDone : _thumbnail);
+		} else {
+			auto hq = PainterHighQualityEnabler(p);
+			p.drawImage(ellipse, _thumbnailLarge);
 		}
 	}
 

Telegram/SourceFiles/ui/controls/download_bar.h

@@ -50,6 +50,7 @@ public:
 private:
 	void paint(Painter &p, QRect clip);
 	void refreshIcon();
+	void refreshThumbnail();
 	void refreshInfo(const DownloadBarProgress &progress);
 	void radialAnimationCallback(crl::time now);
 	[[nodiscard]] float64 computeProgress() const;
@@ -60,9 +61,13 @@ private:
 	rpl::variable<DownloadBarProgress> _progress;
 	Ui::Animations::Simple _finishedAnimation;
 	bool _finished = false;
-	QImage _documentIconOriginal;
+	QImage _documentIconLarge;
 	QImage _documentIcon;
 	QImage _documentIconDone;
+	qint64 _thumbnailCacheKey = 0;
+	QImage _thumbnailLarge;
+	QImage _thumbnail;
+	QImage _thumbnailDone;
 	Text::String _title;
 	Text::String _info;
 	RadialAnimation _radial;