feat: simple files reordering in send box

Telegram/SourceFiles/boxes/send_files_box.cpp

@@ -70,13 +70,17 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "base/unixtime.h"
 #include "styles/style_menu_icons.h"
 #include "ayu/utils/telegram_helpers.h"
+#include <QApplication>
 #include <QBuffer>
+#include <QDrag>
 
 
 namespace {
 
 constexpr auto kMaxMessageLength = 4096;
 
+constexpr auto kDragMime = "application/x-tg-sendfile-index";
+
 using Ui::SendFilesWay;
 
 [[nodiscard]] inline bool CanAddUrls(const QList<QUrl> &urls) {
@@ -1123,6 +1127,10 @@ void SendFilesBox::pushBlock(int from, int till) {
 		block.takeWidget(),
 		QMargins(0, _inner->count() ? st::sendMediaRowSkip : 0, 0, 0));
 
+	if ((till - from) == 1 && isFileBlock(from)) {
+		setupDragForBlock(widget, from);
+	}
+
 	block.itemDeleteRequest(
 	) | rpl::filter([=] {
 		return !_removingIndex;
@@ -2010,3 +2018,105 @@ Fn<void(Api::SendOptions)> SendFilesBox::sendCallback() {
 }
 
 SendFilesBox::~SendFilesBox() = default;
+
+// AyuGram files reordering
+
+bool SendFilesBox::isFileBlock(int i) const {
+	using Type = Ui::PreparedFile::Type;
+	const auto &f = _list.files[i];
+	return (f.type == Type::File)
+		|| (f.type == Type::Music)
+		|| (f.type == Type::None)
+		|| (f.type == Type::Photo && !_sendWay.current().sendImagesAsPhotos());
+}
+
+void SendFilesBox::moveFile(int from, int to) {
+	if (from < 0 || to < 0
+		|| from >= _list.files.size()
+		|| to >= _list.files.size())
+		return;
+
+	if (from == to) return;
+
+	std::swap(_list.files[from], _list.files[to]);
+
+	refreshAllAfterChanges(std::min(from, to));
+}
+
+void SendFilesBox::setupDragForBlock(not_null<Ui::RpWidget*> w, int index) {
+	w->setAcceptDrops(true);
+
+	const auto pressed = w->lifetime().make_state<rpl::variable<bool>>(false);
+	const auto pressPos = w->lifetime().make_state<rpl::variable<QPoint>>();
+
+	base::install_event_filter(
+		w,
+		[=](not_null<QEvent*> e)
+		{
+			switch (e->type()) {
+				case QEvent::MouseButtonPress: {
+					const auto ev = static_cast<QMouseEvent*>(e.get());
+					if (ev->button() == Qt::LeftButton) {
+						pressed->force_assign(true);
+						pressPos->force_assign(ev->pos());
+					}
+					break;
+				}
+				case QEvent::MouseMove: {
+					if (pressed->current()) {
+						const auto ev = static_cast<QMouseEvent*>(e.get());
+						if ((ev->pos() - pressPos->current()).manhattanLength()
+							>= QApplication::startDragDistance()) {
+							pressed->force_assign(false);
+
+							const auto drag = std::make_unique<QDrag>(w);
+							auto mime = std::make_unique<QMimeData>();
+							mime->setData(kDragMime, QByteArray::number(index));
+							drag->setMimeData(mime.release());
+							drag->setPixmap(w->grab());
+							drag->setHotSpot(ev->pos());
+							drag->exec(Qt::MoveAction);
+						}
+					}
+					break;
+				}
+				case QEvent::MouseButtonRelease: pressed->force_assign(false);
+					break;
+
+				case QEvent::DragEnter:
+				case QEvent::DragMove: {
+					const auto ev = static_cast<QDragMoveEvent*>(e.get());
+					if (ev->mimeData()->hasFormat(kDragMime)) {
+						const auto from = ev->mimeData()
+							->data(kDragMime).toInt();
+						if (isFileBlock(from) && isFileBlock(index)) {
+							ev->acceptProposedAction();
+						}
+					}
+					break;
+				}
+				case QEvent::Drop: {
+					const auto ev = static_cast<QDropEvent*>(e.get());
+					if (ev->mimeData()->hasFormat(kDragMime)) {
+						const auto from = ev->mimeData()
+							->data(kDragMime).toInt();
+						if (isFileBlock(from) && isFileBlock(index)) {
+							const auto dest = index;
+							QMetaObject::invokeMethod(
+								this,
+								[this, from, dest]
+								{
+									moveFile(from, dest);
+								},
+								Qt::QueuedConnection);
+
+							ev->acceptProposedAction();
+						}
+					}
+					break;
+				}
+				default: break;
+			}
+			return base::EventFilterResult::Continue;
+		});
+}

Telegram/SourceFiles/boxes/send_files_box.h

@@ -310,4 +310,10 @@ private:
 	QPointer<Ui::RoundButton> _send;
 	QPointer<Ui::RoundButton> _addFile;
 
+	// AyuGram files reordering
+
+	[[nodiscard]] bool isFileBlock(int i) const;
+	void moveFile(int from, int to);
+	void setupDragForBlock(not_null<Ui::RpWidget*> w, int index);
+
 };