core/menu: add QsMenuAnchor for more control of platform menus

src/core/qsmenuanchor.cpp

@@ -0,0 +1,105 @@
+#include "qsmenuanchor.hpp"
+
+#include <qlogging.h>
+#include <qobject.h>
+#include <qtmetamacros.h>
+
+#include "platformmenu.hpp"
+#include "popupanchor.hpp"
+#include "qsmenu.hpp"
+
+using qs::menu::platform::PlatformMenuEntry;
+
+namespace qs::menu {
+
+QsMenuAnchor::~QsMenuAnchor() { this->onClosed(); }
+
+void QsMenuAnchor::open() {
+	if (this->mOpen) {
+		qCritical() << "Cannot call QsMenuAnchor.open() as it is already open.";
+		return;
+	}
+
+	if (!this->mMenu) {
+		qCritical() << "Cannot open QsMenuAnchor with no menu attached.";
+		return;
+	}
+
+	this->mOpen = true;
+
+	if (this->mMenu->menu()) this->onMenuChanged();
+	QObject::connect(this->mMenu, &QsMenuHandle::menuChanged, this, &QsMenuAnchor::onMenuChanged);
+	this->mMenu->refHandle();
+
+	emit this->visibleChanged();
+}
+
+void QsMenuAnchor::onMenuChanged() {
+	// close menu if the path changes
+	if (this->platformMenu || !this->mMenu->menu()) {
+		this->onClosed();
+		return;
+	}
+
+	this->platformMenu = new PlatformMenuEntry(this->mMenu->menu());
+	QObject::connect(this->platformMenu, &PlatformMenuEntry::closed, this, &QsMenuAnchor::onClosed);
+
+	auto success = this->platformMenu->display(&this->mAnchor);
+	if (!success) this->onClosed();
+	else emit this->opened();
+}
+
+void QsMenuAnchor::close() {
+	if (!this->mOpen) {
+		qCritical() << "Cannot close QsMenuAnchor as it isn't open.";
+		return;
+	}
+
+	this->onClosed();
+}
+
+void QsMenuAnchor::onClosed() {
+	if (!this->mOpen) return;
+
+	this->mOpen = false;
+
+	if (this->platformMenu) {
+		this->platformMenu->deleteLater();
+		this->platformMenu = nullptr;
+	}
+
+	QObject::disconnect(this->mMenu, &QsMenuHandle::menuChanged, this, &QsMenuAnchor::onMenuChanged);
+	this->mMenu->unrefHandle();
+	emit this->closed();
+	emit this->visibleChanged();
+}
+
+PopupAnchor* QsMenuAnchor::anchor() { return &this->mAnchor; }
+
+QsMenuHandle* QsMenuAnchor::menu() const { return this->mMenu; }
+
+void QsMenuAnchor::setMenu(QsMenuHandle* menu) {
+	if (menu == this->mMenu) return;
+
+	if (this->mMenu != nullptr) {
+		if (this->platformMenu != nullptr) this->platformMenu->deleteLater();
+		QObject::disconnect(this->mMenu, nullptr, this, nullptr);
+	}
+
+	this->mMenu = menu;
+
+	if (menu != nullptr) {
+		QObject::connect(menu, &QObject::destroyed, this, &QsMenuAnchor::onMenuDestroyed);
+	}
+
+	emit this->menuChanged();
+}
+
+bool QsMenuAnchor::isVisible() const { return this->mOpen; }
+
+void QsMenuAnchor::onMenuDestroyed() {
+	this->mMenu = nullptr;
+	emit this->menuChanged();
+}
+
+} // namespace qs::menu