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Telegram/SourceFiles/history/history_drag_area.h

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+#include "ui/rp_widget.h"
+#include "ui/effects/animations.h"
+
+namespace Storage {
+enum class MimeDataState;
+} // namespace Storage
+
+class DragArea : public Ui::RpWidget {
+public:
+	DragArea(QWidget *parent);
+
+	struct Areas {
+		DragArea *document;
+		DragArea *photo;
+	};
+
+	using CallbackComputeState
+		= Fn<Storage::MimeDataState(const QMimeData *data)>;
+
+	static Areas SetupDragAreaToContainer(
+		not_null<Ui::RpWidget*> container,
+		Fn<bool(not_null<const QMimeData*>)> &&dragEnterFilter = nullptr,
+		Fn<void(bool)> &&setAcceptDropsField = nullptr,
+		Fn<void()> &&updateControlsGeometry = nullptr,
+		CallbackComputeState &&computeState = nullptr,
+		bool hideSubtext = false);
+
+	void setText(const QString &text, const QString &subtext);
+
+	void otherEnter();
+	void otherLeave();
+
+	bool overlaps(const QRect &globalRect);
+
+	void hideFast();
+
+	void setDroppedCallback(Fn<void(const QMimeData *data)> callback) {
+		_droppedCallback = std::move(callback);
+	}
+
+protected:
+	void paintEvent(QPaintEvent *e) override;
+	void mouseMoveEvent(QMouseEvent *e) override;
+	void dragMoveEvent(QDragMoveEvent *e) override;
+	// These events should be filtered by parent!
+	void dragEnterEvent(QDragEnterEvent *e) override;
+	void dragLeaveEvent(QDragLeaveEvent *e) override;
+	void dropEvent(QDropEvent *e) override;
+
+private:
+	void hideStart();
+	void hideFinish();
+
+	void showStart();
+
+	void setIn(bool in);
+	void opacityAnimationCallback();
+
+	bool _hiding = false;
+	bool _in = false;
+	QPixmap _cache;
+	Fn<void(const QMimeData *data)> _droppedCallback;
+
+	Ui::Animations::Simple _a_opacity;
+	Ui::Animations::Simple _a_in;
+
+	QString _text, _subtext;
+
+};