init

Telegram/lib_ui/ui/widgets/inner_dropdown.h

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+#include "styles/style_widgets.h"
+#include "ui/rp_widget.h"
+#include "ui/round_rect.h"
+#include "ui/effects/animations.h"
+#include "ui/effects/panel_animation.h"
+#include "base/object_ptr.h"
+#include "base/timer.h"
+
+namespace Ui {
+
+class ScrollArea;
+
+class InnerDropdown : public RpWidget {
+
+public:
+	InnerDropdown(QWidget *parent, const style::InnerDropdown &st = st::defaultInnerDropdown);
+
+	template <typename Widget>
+	QPointer<Widget> setOwnedWidget(object_ptr<Widget> widget) {
+		auto result = doSetOwnedWidget(std::move(widget));
+		return QPointer<Widget>(static_cast<Widget*>(result.data()));
+	}
+
+	bool overlaps(const QRect &globalRect) {
+		if (isHidden() || _a_show.animating() || _a_opacity.animating()) return false;
+
+		return rect().marginsRemoved(_st.padding).contains(QRect(mapFromGlobal(globalRect.topLeft()), globalRect.size()));
+	}
+
+	void setAutoHiding(bool autoHiding) {
+		_autoHiding = autoHiding;
+	}
+	void setMaxHeight(int newMaxHeight);
+	void resizeToContent();
+
+	void otherEnter();
+	void otherLeave();
+
+	void setShowStartCallback(Fn<void()> callback) {
+		_showStartCallback = std::move(callback);
+	}
+	void setHideStartCallback(Fn<void()> callback) {
+		_hideStartCallback = std::move(callback);
+	}
+	void setHiddenCallback(Fn<void()> callback) {
+		_hiddenCallback = std::move(callback);
+	}
+
+	bool isHiding() const {
+		return _hiding && _a_opacity.animating();
+	}
+
+	enum class HideOption {
+		Default,
+		IgnoreShow,
+	};
+	void showAnimated();
+	void setOrigin(PanelAnimation::Origin origin);
+	void showAnimated(PanelAnimation::Origin origin);
+	void hideAnimated(HideOption option = HideOption::Default);
+	void finishAnimating();
+	void showFast();
+	void hideFast();
+
+protected:
+	void resizeEvent(QResizeEvent *e) override;
+	void paintEvent(QPaintEvent *e) override;
+	void enterEventHook(QEnterEvent *e) override;
+	void leaveEventHook(QEvent *e) override;
+	bool eventFilter(QObject *obj, QEvent *e) override;
+
+	int resizeGetHeight(int newWidth) override;
+
+
+private:
+	QPointer<RpWidget> doSetOwnedWidget(object_ptr<RpWidget> widget);
+	QImage grabForPanelAnimation();
+	void startShowAnimation();
+	void startOpacityAnimation(bool hiding);
+	void prepareCache();
+
+	class Container;
+	void showAnimationCallback();
+	void opacityAnimationCallback();
+
+	void hideFinished();
+	void showStarted();
+
+	void updateHeight();
+
+	void scrolled();
+
+	const style::InnerDropdown &_st;
+
+	RoundRect _roundRect;
+	PanelAnimation::Origin _origin = PanelAnimation::Origin::TopLeft;
+	std::unique_ptr<PanelAnimation> _showAnimation;
+	Animations::Simple _a_show;
+
+	bool _autoHiding = true;
+	bool _hiding = false;
+	QPixmap _cache;
+	Animations::Simple _a_opacity;
+
+	base::Timer _hideTimer;
+	bool _ignoreShowEvents = false;
+	Fn<void()> _showStartCallback;
+	Fn<void()> _hideStartCallback;
+	Fn<void()> _hiddenCallback;
+
+	object_ptr<ScrollArea> _scroll;
+
+	int _maxHeight = 0;
+
+};
+
+class InnerDropdown::Container : public RpWidget {
+public:
+	Container(QWidget *parent, object_ptr<RpWidget> child, const style::InnerDropdown &st);
+
+	void resizeToContent();
+
+protected:
+	int resizeGetHeight(int newWidth) override;
+	void visibleTopBottomUpdated(
+		int visibleTop,
+		int visibleBottom) override;
+
+private:
+	object_ptr<RpWidget> _child;
+
+	const style::InnerDropdown &_st;
+
+};
+
+} // namespace Ui