init

Telegram/SourceFiles/ui/widgets/horizontal_fit_container.cpp

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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
+*/
+#include "ui/widgets/horizontal_fit_container.h"
+
+#include "ui/widgets/buttons.h"
+
+namespace Ui {
+
+HorizontalFitContainer::HorizontalFitContainer(
+	not_null<RpWidget*> parent,
+	int spacing)
+: RpWidget(parent)
+, _spacing(spacing) {
+	sizeValue() | rpl::on_next([=](QSize size) {
+		updateLayout(size);
+	}, lifetime());
+}
+
+int HorizontalFitContainer::add(not_null<AbstractButton*> button) {
+	const auto id = _nextId++;
+	_buttons.emplace(id, base::unique_qptr<AbstractButton>{ button.get() });
+	button->setParent(this);
+	button->show();
+	updateLayout(size());
+	return id;
+}
+
+void HorizontalFitContainer::remove(int id) {
+	if (const auto it = _buttons.find(id); it != _buttons.end()) {
+		_buttons.erase(it);
+		updateLayout(size());
+	}
+}
+
+void HorizontalFitContainer::updateLayout(QSize size) {
+	_layoutLifetime.destroy();
+	if (_buttons.empty()) {
+		return;
+	}
+	const auto count = int(_buttons.size());
+	const auto totalSpacing = _spacing * (count - 1);
+	const auto buttonWidth = (size.width() - totalSpacing) / count;
+	const auto h = size.height();
+	auto x = 0;
+	for (const auto &[id, button] : _buttons) {
+		button->setGeometry(x, 0, buttonWidth, h);
+		x += buttonWidth + _spacing;
+	}
+}
+
+} // namespace Ui