init

Telegram/lib_ui/ui/wrap/vertical_layout.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 "ui/rp_widget.h"
+#include "base/object_ptr.h"
+
+namespace Ui {
+
+class VerticalLayout : public RpWidget {
+public:
+	using RpWidget::RpWidget;
+
+	[[nodiscard]] int count() const {
+		return _rows.size();
+	}
+	[[nodiscard]] not_null<RpWidget*> widgetAt(int index) const {
+		Expects(index >= 0 && index < count());
+
+		return _rows[index].widget.data();
+	}
+
+	template <
+		typename Widget,
+		typename = std::enable_if_t<
+			std::is_base_of_v<RpWidget, Widget>>>
+	Widget *insert(
+			int atPosition,
+			object_ptr<Widget> &&child,
+			const style::margins &margin = style::margins(),
+			style::align align = style::al_left) {
+		return static_cast<Widget*>(insertChild(
+			atPosition,
+			std::move(child),
+			margin,
+			align));
+	}
+
+	template <
+		typename Widget,
+		typename = std::enable_if_t<
+			std::is_base_of_v<RpWidget, Widget>>>
+	Widget *insert(
+			int atPosition,
+			object_ptr<Widget> &&child,
+			style::align align) {
+		return static_cast<Widget*>(insertChild(
+			atPosition,
+			std::move(child),
+			style::margins(),
+			align));
+	}
+
+	template <
+		typename Widget,
+		typename = std::enable_if_t<
+			std::is_base_of_v<RpWidget, Widget>>>
+	Widget *add(
+			object_ptr<Widget> &&child,
+			const style::margins &margin = style::margins(),
+			style::align align = style::al_left) {
+		return insert(count(), std::move(child), margin, align);
+	}
+
+	template <
+		typename Widget,
+		typename = std::enable_if_t<
+			std::is_base_of_v<RpWidget, Widget>>>
+	Widget *add(object_ptr<Widget> &&child, style::align align) {
+		return insert(count(), std::move(child), align);
+	}
+
+	QMargins getMargins() const override;
+
+	void setVerticalShift(int index, int shift);
+	void reorderRows(int oldIndex, int newIndex);
+
+	void clear();
+
+protected:
+	int resizeGetHeight(int newWidth) override;
+	void visibleTopBottomUpdated(
+		int visibleTop,
+		int visibleBottom) override;
+
+private:
+	static constexpr auto kAlignLeft = 0;
+	static constexpr auto kAlignCenter = 1;
+	static constexpr auto kAlignRight = -1;
+	static constexpr auto kAlignJustify = -2;
+
+	struct Row {
+		object_ptr<RpWidget> widget;
+		style::margins margin;
+		int32 verticalShift : 30 = 0;
+		int32 align : 2 = 0;
+	};
+
+	RpWidget *insertChild(
+		int addPosition,
+		object_ptr<RpWidget> child,
+		const style::margins &margin,
+		style::align align);
+	void subscribeToWidth(
+		not_null<RpWidget*> child,
+		const style::margins &margin);
+	void childWidthUpdated(RpWidget *child);
+	void childHeightUpdated(RpWidget *child);
+	void removeChild(RpWidget *child);
+	int moveChildGetSkip(
+		const Row &row,
+		int top,
+		int outerWidth,
+		const style::margins &margins) const;
+
+	std::vector<Row> _rows;
+	bool _inResize = false;
+
+	rpl::lifetime _rowsLifetime;
+
+};
+
+} // namespace Ui