From 202534575b6855c6d5a033d8d577cb3ecb9c8851 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Fri, 16 Oct 2020 10:52:55 +0300
Subject: [PATCH] Allow many previews in SendFilesBox.

---
 .../SourceFiles/boxes/edit_caption_box.cpp    |   2 +-
 Telegram/SourceFiles/boxes/send_files_box.cpp | 313 ++++++++++--------
 Telegram/SourceFiles/boxes/send_files_box.h   |  17 +-
 .../SourceFiles/history/history_widget.cpp    |   4 +-
 .../view/history_view_replies_section.cpp     |   7 +-
 .../SourceFiles/storage/localimageloader.cpp  |   9 +-
 .../SourceFiles/storage/localimageloader.h    |   2 +-
 .../storage/storage_media_prepare.cpp         |  40 +--
 .../ui/chat/attach/attach_album_preview.cpp   |  10 +-
 .../ui/chat/attach/attach_album_preview.h     |  10 +-
 .../ui/chat/attach/attach_prepare.cpp         |  57 +++-
 .../ui/chat/attach/attach_prepare.h           |  19 +-
 .../attach/attach_single_file_preview.cpp     |  12 +-
 .../chat/attach/attach_single_file_preview.h  |   2 -
 .../attach/attach_single_media_preview.cpp    |   6 +-
 .../chat/attach/attach_single_media_preview.h |   2 -
 16 files changed, 286 insertions(+), 226 deletions(-)

diff --git a/Telegram/SourceFiles/boxes/edit_caption_box.cpp b/Telegram/SourceFiles/boxes/edit_caption_box.cpp
index 1a216e3bd5..659151e98d 100644
--- a/Telegram/SourceFiles/boxes/edit_caption_box.cpp
+++ b/Telegram/SourceFiles/boxes/edit_caption_box.cpp
@@ -689,7 +689,7 @@ bool EditCaptionBox::fileFromClipboard(not_null<const QMimeData*> data) {
 	}
 
 	const auto file = &list.files.front();
-	if (_isAlbum && (file->type == AlbumType::None)) {
+	if (_isAlbum && (file->type == AlbumType::File)) {
 		const auto imageAsDoc = [&] {
 			using Info = Ui::PreparedFileInformation;
 			const auto fileMedia = &file->information->media;
diff --git a/Telegram/SourceFiles/boxes/send_files_box.cpp b/Telegram/SourceFiles/boxes/send_files_box.cpp
index 01d323c818..f0accfe2e2 100644
--- a/Telegram/SourceFiles/boxes/send_files_box.cpp
+++ b/Telegram/SourceFiles/boxes/send_files_box.cpp
@@ -31,6 +31,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/widgets/input_fields.h"
 #include "ui/widgets/scroll_area.h"
 #include "ui/wrap/fade_wrap.h"
+#include "ui/wrap/vertical_layout.h"
 #include "ui/chat/attach/attach_prepare.h"
 #include "ui/chat/attach/attach_send_files_way.h"
 #include "ui/chat/attach/attach_album_preview.h"
@@ -64,12 +65,6 @@ inline bool CanAddUrls(const QList<QUrl> &urls) {
 	return !urls.isEmpty() && ranges::all_of(urls, &QUrl::isLocalFile);
 }
 
-inline bool IsFirstAlbumItem(const Ui::PreparedList &list) {
-	using AlbumType = Ui::PreparedFile::AlbumType;
-	return (list.files.size() > 0)
-		&& (list.files.front().type != AlbumType::None);
-}
-
 inline bool IsSingleItem(const Ui::PreparedList &list) {
 	return list.files.size() == 1;
 }
@@ -98,9 +93,7 @@ void FileDialogCallback(
 rpl::producer<QString> FieldPlaceholder(
 		const Ui::PreparedList &list,
 		SendFilesWay way) {
-	const auto isAlbum = list.singleAlbumIsPossible
-		&& way.groupMediaInAlbums();
-	return list.canAddCaption(isAlbum)
+	return list.canAddCaption(way.groupMediaInAlbums())
 		? tr::lng_photo_caption()
 		: tr::lng_photos_comment();
 }
@@ -125,10 +118,14 @@ SendFilesBox::SendFilesBox(
 	st::confirmCaptionArea,
 	Ui::InputField::Mode::MultiLine,
 	nullptr,
-	caption) {
+	caption)
+, _scroll(this, st::boxScroll)
+, _inner(
+	_scroll->setOwnedWidget(
+		object_ptr<Ui::VerticalLayout>(_scroll.data()))) {
 }
 
-void SendFilesBox::initPreview(rpl::producer<int> desiredPreviewHeight) {
+void SendFilesBox::initPreview() {
 	using namespace rpl::mappers;
 
 	setupControls();
@@ -136,8 +133,10 @@ void SendFilesBox::initPreview(rpl::producer<int> desiredPreviewHeight) {
 	updateBoxSize();
 
 	_dimensionsLifetime.destroy();
+	_inner->resizeToWidth(st::boxWideWidth);
+
 	rpl::combine(
-		std::move(desiredPreviewHeight),
+		_inner->heightValue(),
 		_footerHeight.value(),
 		_titleHeight + _1 + _2
 	) | rpl::start_with_next([=](int height) {
@@ -146,102 +145,83 @@ void SendFilesBox::initPreview(rpl::producer<int> desiredPreviewHeight) {
 			std::min(st::sendMediaPreviewHeightMax, height),
 			true);
 	}, _dimensionsLifetime);
-
-	if (_preview) {
-		_preview->show();
-	}
 }
 
-void SendFilesBox::prepareSingleFilePreview() {
-	Expects(IsSingleItem(_list));
+//void SendFilesBox::prepareSingleFilePreview() {
+//	const auto &file = _list.files[0];
+//	const auto controller = _controller;
+//	const auto media = Ui::SingleMediaPreview::Create(this, [=] {
+//		return controller->isGifPausedAtLeastFor(
+//			Window::GifPauseReason::Layer);
+//	}, file);
+//	if (media) {
+//		_preview = media;
+//		initPreview(media->desiredHeightValue());
+//	} else {
+//		const auto preview = Ui::CreateChild<Ui::SingleFilePreview>(this, file);
+//		_preview = preview;
+//		initPreview(preview->desiredHeightValue());
+//	}
+//}
 
-	const auto &file = _list.files[0];
-	const auto controller = _controller;
-	const auto media = Ui::SingleMediaPreview::Create(this, [=] {
-		return controller->isGifPausedAtLeastFor(
-			Window::GifPauseReason::Layer);
-	}, file);
-	if (media) {
-		_preview = media;
-		initPreview(media->desiredHeightValue());
-	} else {
-		const auto preview = Ui::CreateChild<Ui::SingleFilePreview>(this, file);
-		_preview = preview;
-		initPreview(preview->desiredHeightValue());
-	}
-}
-
-void SendFilesBox::prepareAlbumPreview() {
-	const auto wrap = Ui::CreateChild<Ui::ScrollArea>(
-		this,
-		st::boxScroll);
-	_albumPreview = wrap->setOwnedWidget(object_ptr<Ui::AlbumPreview>(
-		this,
-		_list,
-		_sendWay.current()));
-
-	addThumbButtonHandlers(wrap);
-
-	_preview = wrap;
-	_albumPreview->show();
-	setupShadows(wrap, _albumPreview);
-
-	initPreview(_albumPreview->desiredHeightValue());
-
-	crl::on_main([=] {
-		wrap->scrollToY(_lastScrollTop);
-		_lastScrollTop = 0;
-	});
-}
+//void SendFilesBox::prepareAlbumPreview() {
+//	addThumbButtonHandlers(wrap); // #TODO files
+//
+//	setupShadows(wrap, _albumPreview);
+//
+//	initPreview(_albumPreview->desiredHeightValue());
+//
+//	crl::on_main([=] {
+//		wrap->scrollToY(_lastScrollTop);
+//		_lastScrollTop = 0;
+//	});
+//}
 
 void SendFilesBox::addThumbButtonHandlers(not_null<Ui::ScrollArea*> wrap) {
-	_albumPreview->thumbDeleted(
-	) | rpl::start_with_next([=](auto index) {
-		_lastScrollTop = wrap->scrollTop();
+	// #TODO files
+	//_albumPreview->thumbDeleted(
+	//) | rpl::start_with_next([=](auto index) {
+	//	_lastScrollTop = wrap->scrollTop();
 
-		_list.files.erase(_list.files.begin() + index);
-		applyAlbumOrder();
+	//	_list.files.erase(_list.files.begin() + index);
+	//	applyAlbumOrder();
 
-		if (_preview) {
-			_preview->deleteLater();
-		}
-		_albumPreview = nullptr;
+	//	if (_preview) {
+	//		_preview->deleteLater();
+	//	}
+	//	_albumPreview = nullptr;
 
-		if (IsSingleItem(_list)) {
-			_list.singleAlbumIsPossible = false;
-		}
+	//	refreshAllAfterAlbumChanges();
+	//}, _albumPreview->lifetime());
 
-		refreshAllAfterAlbumChanges();
-	}, _albumPreview->lifetime());
+	//_albumPreview->thumbChanged(
+	//) | rpl::start_with_next([=](auto index) {
+	//	_lastScrollTop = wrap->scrollTop();
 
-	_albumPreview->thumbChanged(
-	) | rpl::start_with_next([=](auto index) {
-		_lastScrollTop = wrap->scrollTop();
+	//	const auto callback = [=](FileDialog::OpenResult &&result) {
+	//		FileDialogCallback(
+	//			std::move(result),
+	//			true,
+	//			[=] (auto list) {
+	//				_list.files[index] = std::move(list.files.front());
+	//				applyAlbumOrder();
 
-		const auto callback = [=](FileDialog::OpenResult &&result) {
-			FileDialogCallback(
-				std::move(result),
-				true,
-				[=] (auto list) {
-					_list.files[index] = std::move(list.files.front());
-					applyAlbumOrder();
+	//				if (_preview) {
+	//					_preview->deleteLater();
+	//				}
+	//				_albumPreview = nullptr;
 
-					if (_preview) {
-						_preview->deleteLater();
-					}
-					_albumPreview = nullptr;
+	//				refreshAllAfterAlbumChanges();
+	//			});
+	//	};
 
-					refreshAllAfterAlbumChanges();
-				});
-		};
+	//	FileDialog::GetOpenPath(
+	//		this,
+	//		tr::lng_choose_file(tr::now),
+	//		FileDialog::AlbumFilesFilter(),
+	//		crl::guard(this, callback));
 
-		FileDialog::GetOpenPath(
-			this,
-			tr::lng_choose_file(tr::now),
-			FileDialog::AlbumFilesFilter(),
-			crl::guard(this, callback));
-
-	}, _albumPreview->lifetime());
+	//}, _albumPreview->lifetime());
 }
 
 void SendFilesBox::setupShadows(
@@ -288,6 +268,10 @@ void SendFilesBox::prepare() {
 	setupCaption();
 	setupSendWayControls();
 	preparePreview();
+	initPreview();
+
+	_scroll->show();
+	_inner->show();
 
 	boxClosing() | rpl::start_with_next([=] {
 		if (!_confirmed && _cancelledCallback) {
@@ -379,10 +363,6 @@ void SendFilesBox::initSendWay() {
 	_sendWay.changes(
 	) | rpl::start_with_next([=](SendFilesWay value) {
 		updateCaptionPlaceholder();
-		applyAlbumOrder();
-		if (_albumPreview) {
-			_albumPreview->setSendWay(value);
-		}
 		updateEmojiPanelGeometry();
 		setInnerFocus();
 	}, lifetime());
@@ -393,9 +373,8 @@ void SendFilesBox::updateCaptionPlaceholder() {
 		return;
 	}
 	const auto sendWay = _sendWay.current();
-	const auto isAlbum = _list.singleAlbumIsPossible
-		&& sendWay.groupMediaInAlbums();
-	if (!_list.canAddCaption(isAlbum) && _sendLimit == SendLimit::One) {
+	if (!_list.canAddCaption(sendWay.groupMediaInAlbums())
+		&& _sendLimit == SendLimit::One) {
 		_caption->hide();
 		if (_emojiToggle) {
 			_emojiToggle->hide();
@@ -410,11 +389,73 @@ void SendFilesBox::updateCaptionPlaceholder() {
 }
 
 void SendFilesBox::preparePreview() {
-	if (IsSingleItem(_list)) {
-		prepareSingleFilePreview();
-	} else {
-		prepareAlbumPreview(); // #TODO files many albums
+	using Type = Ui::PreparedFile::AlbumType;
+
+	_blocks.clear();
+	auto albumStart = -1;
+	const auto finishAlbum = [&](int till) {
+		if (albumStart < 0) {
+			return;
+		}
+		const auto count = (till - albumStart);
+		const auto preview = _inner->add(object_ptr<Ui::AlbumPreview>(
+			this,
+			gsl::make_span(_list.files).subspan(albumStart, count),
+			_sendWay.current()));
+
+		auto &block = _blocks.emplace_back();
+		block.fromIndex = albumStart;
+		block.tillIndex = albumStart + count;
+		block.preview.reset(preview);
+		block.preview->show();
+
+		_sendWay.changes(
+		) | rpl::start_with_next([=](SendFilesWay value) {
+			applyAlbumOrder(preview, albumStart);
+			preview->setSendWay(value);
+		}, preview->lifetime());
+
+		albumStart = -1;
+	};
+	const auto finishSingle = [&](int index) {
+		const auto &file = _list.files[index];
+		const auto controller = _controller;
+		auto &block = _blocks.emplace_back();
+		block.fromIndex = index;
+		block.tillIndex = index + 1;
+		const auto media = Ui::SingleMediaPreview::Create(this, [=] {
+			return controller->isGifPausedAtLeastFor(
+				Window::GifPauseReason::Layer);
+		}, file);
+		if (media) {
+			block.preview.reset(
+				_inner->add(object_ptr<Ui::SingleMediaPreview>::fromRaw(
+					media)));
+		} else {
+			block.preview.reset(
+				_inner->add(object_ptr<Ui::SingleFilePreview>(this, file)));
+		}
+		block.preview->show();
+	};
+	for (auto i = 0, count = int(_list.files.size()); i != count; ++i) {
+		const auto type = _list.files[i].type;
+		if (albumStart >= 0) {
+			const auto albumCount = (i - albumStart);
+			if (type == Type::File || (albumCount == Ui::MaxAlbumItems())) {
+				finishAlbum(i);
+			} else {
+				continue;
+			}
+		}
+		if (type != Type::File) {
+			if (albumStart < 0) {
+				albumStart = i;
+			}
+			continue;
+		}
+		finishSingle(i);
 	}
+	finishAlbum(_list.files.size());
 }
 
 void SendFilesBox::setupControls() {
@@ -479,12 +520,10 @@ void SendFilesBox::updateSendWayControlsVisibility() {
 	_groupFiles->setVisible(!onlyOne);
 }
 
-void SendFilesBox::applyAlbumOrder() {
-	if (!_albumPreview) {
-		return;
-	}
-
-	const auto order = _albumPreview->takeOrder();
+void SendFilesBox::applyAlbumOrder(
+		not_null<Ui::AlbumPreview*> preview,
+		int from) {
+	const auto order = preview->takeOrder();
 	const auto isDefault = [&] {
 		for (auto i = 0, count = int(order.size()); i != count; ++i) {
 			if (order[i] != i) {
@@ -497,7 +536,14 @@ void SendFilesBox::applyAlbumOrder() {
 		return;
 	}
 
-	_list = Ui::PreparedList::Reordered(std::move(_list), order);
+	auto elements = std::vector<Ui::PreparedFile>();
+	elements.reserve(order.size());
+	for (const auto index : order) {
+		elements.push_back(std::move(_list.files[from + index]));
+	}
+	for (auto i = 0, count = int(order.size()); i != count; ++i) {
+		_list.files[from + i] = std::move(elements[i]);
+	}
 }
 
 void SendFilesBox::setupCaption() {
@@ -604,20 +650,21 @@ void SendFilesBox::captionResized() {
 }
 
 bool SendFilesBox::canAddFiles(not_null<const QMimeData*> data) const {
-	const auto urls = data->hasUrls() ? data->urls() : QList<QUrl>();
-	auto filesCount = CanAddUrls(urls) ? urls.size() : 0;
-	if (!filesCount && data->hasImage()) {
-		++filesCount;
-	}
+	return (data->hasUrls() && CanAddUrls(data->urls())) || data->hasImage();
+	//const auto urls = data->hasUrls() ? data->urls() : QList<QUrl>();
+	//auto filesCount = CanAddUrls(urls) ? urls.size() : 0;
+	//if (!filesCount && data->hasImage()) {
+	//	++filesCount;
+	//}
 
-	if (_list.files.size() + filesCount > Ui::MaxAlbumItems()) {
-		return false;
-	} else if (_list.files.size() > 1 && !_albumPreview) {
-		return false;
-	} else if (!IsFirstAlbumItem(_list)) {
-		return false;
-	}
-	return true;
+	//if (_list.files.size() + filesCount > Ui::MaxAlbumItems()) { // #TODO files
+	//	return false;
+	//} else if (_list.files.size() > 1 && !_albumPreview) {
+	//	return false;
+	//} else if (!IsFirstAlbumItem(_list)) {
+	//	return false;
+	//}
+	//return true;
 }
 
 bool SendFilesBox::addFiles(not_null<const QMimeData*> data) {
@@ -661,10 +708,10 @@ bool SendFilesBox::addFiles(Ui::PreparedList list) {
 	//} else if (!IsFirstAlbumItem(_list)) {
 	//	return false;
 	}
-	applyAlbumOrder();
-	delete base::take(_preview);
-	_albumPreview = nullptr;
-
+	//applyAlbumOrder();
+	//delete base::take(_preview);
+	//_albumPreview = nullptr;
+	return false;
 	_list.mergeToEnd(std::move(list), cutToAlbumSize);
 
 	refreshAllAfterAlbumChanges();
@@ -769,10 +816,8 @@ void SendFilesBox::updateControlsGeometry() {
 			bottom -= st::boxPhotoCompressedSkip + pointer->heightNoMargins();
 		}
 	}
-	if (_preview) {
-		_preview->resize(width(), bottom - _titleHeight);
-		_preview->move(0, _titleHeight);
-	}
+	_scroll->resize(width(), bottom - _titleHeight);
+	_scroll->move(0, _titleHeight);
 }
 
 void SendFilesBox::setInnerFocus() {
@@ -809,7 +854,7 @@ void SendFilesBox::send(
 		Core::App().saveSettingsDelayed();
 	}
 
-	applyAlbumOrder();
+	//applyAlbumOrder(); // #TODO files
 	_confirmed = true;
 	if (_confirmedCallback) {
 		auto caption = (_caption && !_caption->isHidden())
diff --git a/Telegram/SourceFiles/boxes/send_files_box.h b/Telegram/SourceFiles/boxes/send_files_box.h
index 46ffe34b53..00f0626e8a 100644
--- a/Telegram/SourceFiles/boxes/send_files_box.h
+++ b/Telegram/SourceFiles/boxes/send_files_box.h
@@ -34,6 +34,7 @@ class InputField;
 struct GroupMediaLayout;
 class EmojiButton;
 class AlbumPreview;
+class VerticalLayout;
 } // namespace Ui
 
 namespace Window {
@@ -83,8 +84,13 @@ protected:
 	void resizeEvent(QResizeEvent *e) override;
 
 private:
+	struct Block {
+		base::unique_qptr<Ui::RpWidget> preview;
+		int fromIndex = 0;
+		int tillIndex = 0;
+	};
 	void initSendWay();
-	void initPreview(rpl::producer<int> desiredPreviewHeight);
+	void initPreview();
 
 	void setupControls();
 	void setupSendWayControls();
@@ -99,9 +105,7 @@ private:
 	void emojiFilterForGeometry(not_null<QEvent*> event);
 
 	void preparePreview();
-	void prepareSingleFilePreview();
-	void prepareAlbumPreview();
-	void applyAlbumOrder();
+	void applyAlbumOrder(not_null<Ui::AlbumPreview*> preview, int from);
 
 	void send(Api::SendOptions options, bool ctrlShiftEnter = false);
 	void sendSilent();
@@ -157,8 +161,9 @@ private:
 	rpl::event_stream<> _albumChanged;
 	rpl::lifetime _dimensionsLifetime;
 
-	QWidget *_preview = nullptr;
-	Ui::AlbumPreview *_albumPreview = nullptr;
+	object_ptr<Ui::ScrollArea> _scroll;
+	QPointer<Ui::VerticalLayout> _inner;
+	std::vector<Block> _blocks;
 
 	int _lastScrollTop = 0;
 
diff --git a/Telegram/SourceFiles/history/history_widget.cpp b/Telegram/SourceFiles/history/history_widget.cpp
index 4a50804bdd..f731557956 100644
--- a/Telegram/SourceFiles/history/history_widget.cpp
+++ b/Telegram/SourceFiles/history/history_widget.cpp
@@ -4097,9 +4097,7 @@ bool HistoryWidget::showSendingFilesError(
 		} else if (!canWriteMessage()) {
 			return tr::lng_forward_send_files_cant(tr::now);
 		}
-		if (list.files.size() > 1
-			&& _peer->slowmodeApplied()
-			&& !list.singleAlbumIsPossible) {
+		if (_peer->slowmodeApplied() && !list.canBeSentInSlowmode()) {
 			return tr::lng_slowmode_no_many(tr::now);
 		} else if (const auto left = _peer->slowmodeSecondsLeft()) {
 			return tr::lng_slowmode_enabled(
diff --git a/Telegram/SourceFiles/history/view/history_view_replies_section.cpp b/Telegram/SourceFiles/history/view/history_view_replies_section.cpp
index 6415cd87aa..46a0ed4f6b 100644
--- a/Telegram/SourceFiles/history/view/history_view_replies_section.cpp
+++ b/Telegram/SourceFiles/history/view/history_view_replies_section.cpp
@@ -800,15 +800,14 @@ void RepliesWidget::uploadFile(
 bool RepliesWidget::showSendingFilesError(
 		const Ui::PreparedList &list) const {
 	const auto text = [&] {
+		const auto peer = _history->peer;
 		const auto error = Data::RestrictionError(
-			_history->peer,
+			peer,
 			ChatRestriction::f_send_media);
 		if (error) {
 			return *error;
 		}
-		if (list.files.size() > 1
-			&& _history->peer->slowmodeApplied()
-			&& !list.singleAlbumIsPossible) {
+		if (peer->slowmodeApplied() && !list.canBeSentInSlowmode()) {
 			return tr::lng_slowmode_no_many(tr::now);
 		} else if (const auto left = _history->peer->slowmodeSecondsLeft()) {
 			return tr::lng_slowmode_enabled(
diff --git a/Telegram/SourceFiles/storage/localimageloader.cpp b/Telegram/SourceFiles/storage/localimageloader.cpp
index e1e67bf845..6865d52002 100644
--- a/Telegram/SourceFiles/storage/localimageloader.cpp
+++ b/Telegram/SourceFiles/storage/localimageloader.cpp
@@ -530,10 +530,11 @@ FileLoadTask::FileLoadTask(
 
 FileLoadTask::~FileLoadTask() = default;
 
-std::unique_ptr<Ui::PreparedFileInformation> FileLoadTask::ReadMediaInformation(
-		const QString &filepath,
-		const QByteArray &content,
-		const QString &filemime) {
+auto FileLoadTask::ReadMediaInformation(
+	const QString &filepath,
+	const QByteArray &content,
+	const QString &filemime)
+-> std::unique_ptr<Ui::PreparedFileInformation> {
 	auto result = std::make_unique<Ui::PreparedFileInformation>();
 	result->filemime = filemime;
 
diff --git a/Telegram/SourceFiles/storage/localimageloader.h b/Telegram/SourceFiles/storage/localimageloader.h
index b550bb0821..02a403d9b5 100644
--- a/Telegram/SourceFiles/storage/localimageloader.h
+++ b/Telegram/SourceFiles/storage/localimageloader.h
@@ -11,7 +11,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "api/api_common.h"
 #include "ui/chat/attach/attach_prepare.h"
 
-constexpr auto kFileSizeLimit = 2000 * 1024 * 1024; // Load files up to 1500mb
+constexpr auto kFileSizeLimit = 2000 * 1024 * 1024; // Load files up to 2000MB
 
 enum class SendMediaType {
 	Photo,
diff --git a/Telegram/SourceFiles/storage/storage_media_prepare.cpp b/Telegram/SourceFiles/storage/storage_media_prepare.cpp
index a7c79875e3..aa9535964f 100644
--- a/Telegram/SourceFiles/storage/storage_media_prepare.cpp
+++ b/Telegram/SourceFiles/storage/storage_media_prepare.cpp
@@ -62,11 +62,10 @@ QSize PrepareShownDimensions(const QImage &preview) {
 		: result;
 }
 
-bool PrepareAlbumMediaIsWaiting(
+bool PrepareDetailsIsWaiting(
 		QSemaphore &semaphore,
 		PreparedFile &file,
 		int previewWidth) {
-	// TODO: Use some special thread queue, like a separate QThreadPool.
 	crl::async([=, &semaphore, &file] {
 		const auto guard = gsl::finally([&] { semaphore.release(); });
 		if (!file.path.isEmpty()) {
@@ -116,29 +115,21 @@ bool PrepareAlbumMediaIsWaiting(
 	return true;
 }
 
-void PrepareAlbum(PreparedList &result, int previewWidth) {
-	const auto count = int(result.files.size());
-	if (count > Ui::MaxAlbumItems()) {
-		return;
-	}
+void PrepareDetailsInParallel(PreparedList &result, int previewWidth) {
+	Expects(result.files.size() <= Ui::MaxAlbumItems());
 
-	//result.albumIsPossible = (count > 1);
 	auto waiting = 0;
 	QSemaphore semaphore;
 	for (auto &file : result.files) {
-		if (PrepareAlbumMediaIsWaiting(semaphore, file, previewWidth)) {
+		if (PrepareDetailsIsWaiting(
+				semaphore,
+				file,
+				previewWidth)) {
 			++waiting;
 		}
 	}
 	if (waiting > 0) {
 		semaphore.acquire(waiting);
-		//if (result.albumIsPossible) {
-		//	const auto badIt = ranges::find(
-		//		result.files,
-		//		PreparedFile::AlbumType::None,
-		//		[](const PreparedFile &file) { return file.type; });
-		//	result.albumIsPossible = (badIt == result.files.end());
-		//}
 	}
 }
 
@@ -250,13 +241,15 @@ PreparedList PrepareMediaList(const QStringList &files, int previewWidth) {
 				file
 			};
 		}
-		const auto toCompress = HasExtensionFrom(file, extensionsToCompress);
-		if (filesize > App::kImageSizeLimit || !toCompress) {
-//			result.allFilesForCompress = false;
+		if (result.files.size() < Ui::MaxAlbumItems()) {
+			result.files.emplace_back(file);
+			result.files.back().size = filesize;
+		} else {
+			result.filesToProcess.emplace_back(file);
+			result.files.back().size = filesize;
 		}
-		result.files.emplace_back(file);
 	}
-	PrepareAlbum(result, previewWidth);
+	PrepareDetailsInParallel(result, previewWidth);
 	return result;
 }
 
@@ -276,7 +269,7 @@ PreparedList PrepareMediaFromImage(
 			file.information);
 	}
 	result.files.push_back(std::move(file));
-	PrepareAlbum(result, previewWidth);
+	PrepareDetailsInParallel(result, previewWidth);
 	return result;
 }
 
@@ -304,7 +297,7 @@ std::optional<PreparedList> PreparedFileFromFilesDialog(
 		if (isAlbum) {
 			const auto file = &list.files.front();
 			if (!Core::IsMimeAcceptedForAlbum(mimeFile)
-				|| file->type == Storage::PreparedFile::AlbumType::None) {
+				|| file->type == Storage::PreparedFile::AlbumType::File) {
 				errorCallback(tr::lng_edit_media_album_error);
 				return std::nullopt;
 			}
@@ -361,7 +354,6 @@ std::optional<PreparedList> PreparedFileFromFilesDialog(
 		}
 
 		auto list = PreparedList(temp.error, temp.errorData);
-		//list.albumIsPossible = isAlbum;
 		list.files = std::move(filteredFiles);
 
 		return list;
diff --git a/Telegram/SourceFiles/ui/chat/attach/attach_album_preview.cpp b/Telegram/SourceFiles/ui/chat/attach/attach_album_preview.cpp
index e57e5ab480..af6b665266 100644
--- a/Telegram/SourceFiles/ui/chat/attach/attach_album_preview.cpp
+++ b/Telegram/SourceFiles/ui/chat/attach/attach_album_preview.cpp
@@ -22,7 +22,7 @@ constexpr auto kDragDuration = crl::time(200);
 
 AlbumPreview::AlbumPreview(
 	QWidget *parent,
-	const PreparedList &list,
+	gsl::span<PreparedFile> list,
 	SendFilesWay way)
 : RpWidget(parent)
 , _list(list)
@@ -69,7 +69,7 @@ auto AlbumPreview::generateOrderedLayout() const
 	auto sizes = ranges::view::all(
 		_order
 	) | ranges::view::transform([&](int index) {
-		return _list.files[index].shownDimensions;
+		return _list[index].shownDimensions;
 	}) | ranges::to_vector;
 
 	auto layout = LayoutMediaGroup(
@@ -82,19 +82,19 @@ auto AlbumPreview::generateOrderedLayout() const
 }
 
 std::vector<int> AlbumPreview::defaultOrder() const {
-	const auto count = int(_list.files.size());
+	const auto count = int(_list.size());
 	return ranges::view::ints(0, count) | ranges::to_vector;
 }
 
 void AlbumPreview::prepareThumbs() {
 	_order = defaultOrder();
 
-	const auto count = int(_list.files.size());
+	const auto count = int(_list.size());
 	const auto layout = generateOrderedLayout();
 	_thumbs.reserve(count);
 	for (auto i = 0; i != count; ++i) {
 		_thumbs.push_back(std::make_unique<AlbumThumbnail>(
-			_list.files[i],
+			_list[i],
 			layout[i],
 			this,
 			[=] { changeThumbByIndex(thumbIndex(thumbUnderCursor())); },
diff --git a/Telegram/SourceFiles/ui/chat/attach/attach_album_preview.h b/Telegram/SourceFiles/ui/chat/attach/attach_album_preview.h
index fe9a2d1603..fad5a80db7 100644
--- a/Telegram/SourceFiles/ui/chat/attach/attach_album_preview.h
+++ b/Telegram/SourceFiles/ui/chat/attach/attach_album_preview.h
@@ -12,7 +12,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 namespace Ui {
 
-struct PreparedList;
+struct PreparedFile;
 struct GroupMediaLayout;
 class AlbumThumbnail;
 
@@ -20,18 +20,18 @@ class AlbumPreview final : public RpWidget {
 public:
 	AlbumPreview(
 		QWidget *parent,
-		const PreparedList &list,
+		gsl::span<PreparedFile> list,
 		SendFilesWay way);
 	~AlbumPreview();
 
 	void setSendWay(SendFilesWay way);
 	std::vector<int> takeOrder();
 
-	auto thumbDeleted() {
+	[[nodiscard]] rpl::producer<int> thumbDeleted() const {
 		return _thumbDeleted.events();
 	}
 
-	auto thumbChanged() {
+	[[nodiscard]] rpl::producer<int> thumbChanged() const {
 		return _thumbChanged.events();
 	}
 
@@ -73,7 +73,7 @@ private:
 	void cancelDrag();
 	void finishDrag();
 
-	const PreparedList &_list;
+	gsl::span<PreparedFile> _list;
 	SendFilesWay _sendWay;
 	style::cursor _cursor = style::cur_default;
 	std::vector<int> _order;
diff --git a/Telegram/SourceFiles/ui/chat/attach/attach_prepare.cpp b/Telegram/SourceFiles/ui/chat/attach/attach_prepare.cpp
index 1698eb5bbb..07d23def10 100644
--- a/Telegram/SourceFiles/ui/chat/attach/attach_prepare.cpp
+++ b/Telegram/SourceFiles/ui/chat/attach/attach_prepare.cpp
@@ -32,7 +32,6 @@ PreparedList PreparedList::Reordered(
 	Expects(list.files.size() == order.size());
 
 	auto result = PreparedList(list.error, list.errorData);
-	result.singleAlbumIsPossible = list.singleAlbumIsPossible;
 	result.files.reserve(list.files.size());
 	for (auto index : order) {
 		result.files.push_back(std::move(list.files[index]));
@@ -58,28 +57,50 @@ void PreparedList::mergeToEnd(PreparedList &&other, bool cutToAlbumSize) {
 		}
 		files.push_back(std::move(file));
 	}
-	if (files.size() > 1 && files.size() <= kMaxAlbumCount) {
-		const auto badIt = ranges::find(
-			files,
-			PreparedFile::AlbumType::None,
-			[](const PreparedFile &file) { return file.type; });
-		singleAlbumIsPossible = (badIt == files.end());
-	} else {
-		singleAlbumIsPossible = false;
-	}
 }
 
-bool PreparedList::canAddCaption(bool isAlbum) const {
-	const auto isSticker = [&] {
-		if (files.empty()) {
-			return false;
-		}
-		return Core::IsMimeSticker(files.front().mime)
+bool PreparedList::canBeSentInSlowmode() const {
+	if (!filesToProcess.empty()) {
+		return false;
+	} else if (files.size() < 2) {
+		return true;
+	} else if (files.size() > kMaxAlbumCount) {
+		return false;
+	}
+
+	const auto hasFiles = ranges::contains(
+		files,
+		PreparedFile::AlbumType::File,
+		&PreparedFile::type);
+	const auto hasVideos = ranges::contains(
+		files,
+		PreparedFile::AlbumType::Video,
+		&PreparedFile::type);
+
+	// File-s and Video-s never can be grouped.
+	return !hasFiles || !hasVideos;
+}
+
+bool PreparedList::canAddCaption(bool groupMediaInAlbums) const {
+	if (!filesToProcess.empty()
+		|| files.empty()
+		|| files.size() > kMaxAlbumCount) {
+		return false;
+	}
+	if (files.size() == 1) {
+		const auto isSticker = Core::IsMimeSticker(files.front().mime)
 			|| files.front().path.endsWith(
 				qstr(".tgs"),
 				Qt::CaseInsensitive);
-	};
-	return isAlbum || (files.size() == 1 && !isSticker());
+		return !isSticker;
+	} else if (!groupMediaInAlbums) {
+		return false;
+	}
+	const auto hasFiles = ranges::contains(
+		files,
+		PreparedFile::AlbumType::File,
+		&PreparedFile::type);
+	return !hasFiles;
 }
 
 int MaxAlbumItems() {
diff --git a/Telegram/SourceFiles/ui/chat/attach/attach_prepare.h b/Telegram/SourceFiles/ui/chat/attach/attach_prepare.h
index 56e9781ecd..a7a64dd51a 100644
--- a/Telegram/SourceFiles/ui/chat/attach/attach_prepare.h
+++ b/Telegram/SourceFiles/ui/chat/attach/attach_prepare.h
@@ -7,6 +7,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #pragma once
 
+#include <QtCore/QSemaphore>
 #include <deque>
 
 namespace Ui {
@@ -34,8 +35,15 @@ struct PreparedFileInformation {
 };
 
 struct PreparedFile {
+	// File-s can be grouped if 'groupFiles'.
+	// File-s + Photo-s can be grouped if 'groupFiles && !sendImagesAsPhotos'.
+	// Photo-s can be grouped if '(groupFiles && !sendImagesAsPhotos)
+	//   || (groupMediaInAlbums && sendImagesAsPhotos)'.
+	// Photo-s + Video-s can be grouped if 'groupMediaInAlbums
+	//   && sendImagesAsPhotos'.
+	// Video-s can be grouped if 'groupMediaInAlbums'.
 	enum class AlbumType {
-		None,
+		File,
 		Photo,
 		Video,
 	};
@@ -48,10 +56,11 @@ struct PreparedFile {
 	QString path;
 	QByteArray content;
 	QString mime;
+	int size = 0;
 	std::unique_ptr<Ui::PreparedFileInformation> information;
 	QImage preview;
 	QSize shownDimensions;
-	AlbumType type = AlbumType::None;
+	AlbumType type = AlbumType::File;
 };
 
 struct PreparedList {
@@ -73,16 +82,14 @@ struct PreparedList {
 		std::vector<int> order);
 	void mergeToEnd(PreparedList &&other, bool cutToAlbumSize = false);
 
-	[[nodiscard]] bool canAddCaption(bool isAlbum) const;
+	[[nodiscard]] bool canAddCaption(bool groupMediaInAlbums) const;
+	[[nodiscard]] bool canBeSentInSlowmode() const;
 
 	Error error = Error::None;
 	QString errorData;
 	std::vector<PreparedFile> files;
 	std::deque<PreparedFile> filesToProcess;
 	std::optional<bool> overrideSendImagesAsPhotos;
-	//bool someFilesForCompress = false;
-	//bool someAlbumIsPossible = false;
-	bool singleAlbumIsPossible = false;
 };
 
 [[nodiscard]] int MaxAlbumItems();
diff --git a/Telegram/SourceFiles/ui/chat/attach/attach_single_file_preview.cpp b/Telegram/SourceFiles/ui/chat/attach/attach_single_file_preview.cpp
index 43f0e0911a..1e837150e6 100644
--- a/Telegram/SourceFiles/ui/chat/attach/attach_single_file_preview.cpp
+++ b/Telegram/SourceFiles/ui/chat/attach/attach_single_file_preview.cpp
@@ -25,6 +25,11 @@ SingleFilePreview::SingleFilePreview(
 	const PreparedFile &file)
 : RpWidget(parent) {
 	preparePreview(file);
+
+	auto h = _fileThumb.isNull()
+		? (st::msgFilePadding.top() + st::msgFileSize + st::msgFilePadding.bottom())
+		: (st::msgFileThumbPadding.top() + st::msgFileThumbSize + st::msgFileThumbPadding.bottom());
+	resize(width(), st::boxPhotoPadding.top() + h + st::msgShadow);
 }
 
 void SingleFilePreview::prepareThumb(const QImage &preview) {
@@ -163,11 +168,4 @@ void SingleFilePreview::paintEvent(QPaintEvent *e) {
 	p.drawTextLeft(x + nameleft, y + statustop, width(), _statusText);
 }
 
-rpl::producer<int> SingleFilePreview::desiredHeightValue() const {
-	auto h = _fileThumb.isNull()
-		? (st::msgFilePadding.top() + st::msgFileSize + st::msgFilePadding.bottom())
-		: (st::msgFileThumbPadding.top() + st::msgFileThumbSize + st::msgFileThumbPadding.bottom());
-	return rpl::single(st::boxPhotoPadding.top() + h + st::msgShadow);
-}
-
 } // namespace Ui
diff --git a/Telegram/SourceFiles/ui/chat/attach/attach_single_file_preview.h b/Telegram/SourceFiles/ui/chat/attach/attach_single_file_preview.h
index 442106148a..bb06249dd2 100644
--- a/Telegram/SourceFiles/ui/chat/attach/attach_single_file_preview.h
+++ b/Telegram/SourceFiles/ui/chat/attach/attach_single_file_preview.h
@@ -19,8 +19,6 @@ public:
 		QWidget *parent,
 		const PreparedFile &file);
 
-	rpl::producer<int> desiredHeightValue() const override;
-
 protected:
 	void paintEvent(QPaintEvent *e) override;
 
diff --git a/Telegram/SourceFiles/ui/chat/attach/attach_single_media_preview.cpp b/Telegram/SourceFiles/ui/chat/attach/attach_single_media_preview.cpp
index 18b41cbb9e..3d88cbb350 100644
--- a/Telegram/SourceFiles/ui/chat/attach/attach_single_media_preview.cpp
+++ b/Telegram/SourceFiles/ui/chat/attach/attach_single_media_preview.cpp
@@ -135,6 +135,8 @@ void SingleMediaPreview::preparePreview(
 	_preview.setDevicePixelRatio(style::DevicePixelRatio());
 
 	prepareAnimatedPreview(animatedPreviewPath);
+
+	resize(width(), st::boxPhotoPadding.top() + _previewHeight);
 }
 
 void SingleMediaPreview::prepareAnimatedPreview(
@@ -228,8 +230,4 @@ void SingleMediaPreview::paintEvent(QPaintEvent *e) {
 	}
 }
 
-rpl::producer<int> SingleMediaPreview::desiredHeightValue() const {
-	return rpl::single(st::boxPhotoPadding.top() + _previewHeight);
-}
-
 } // namespace Ui
diff --git a/Telegram/SourceFiles/ui/chat/attach/attach_single_media_preview.h b/Telegram/SourceFiles/ui/chat/attach/attach_single_media_preview.h
index 17e035e8e8..8f61787d63 100644
--- a/Telegram/SourceFiles/ui/chat/attach/attach_single_media_preview.h
+++ b/Telegram/SourceFiles/ui/chat/attach/attach_single_media_preview.h
@@ -38,8 +38,6 @@ public:
 		return _canSendAsPhoto;
 	}
 
-	rpl::producer<int> desiredHeightValue() const override;
-
 protected:
 	void paintEvent(QPaintEvent *e) override;