feat: 实现显示消息

src/Magpie.App/ToastPage.cpp

@@ -4,6 +4,66 @@
 #include "ToastPage.g.cpp"
 #endif
 
+using namespace winrt;
+using namespace Windows::UI::Xaml::Controls;
+
 namespace winrt::Magpie::App::implementation {
-
+
+IAsyncAction ToastPage::ShowMessage(const hstring& message) {
+	// !!! HACK !!!
+	// 重用 TeachingTip 有一个 bug: 前一个 Toast 正在消失时新的 Toast 不会显示。为了
+	// 规避它，我们每次都创建新的 TeachingTip，但要保留旧对象的引用，因为播放动画时销毁
+	// 会导致崩溃。oldToastTeachingTip 的生存期可确保动画播放完毕。
+	MUXC::TeachingTip oldTeachingTip = MessageTeachingTip();
+	if (oldTeachingTip) {
+		UnloadObject(oldTeachingTip);
+	}
+
+	weak_ref<MUXC::TeachingTip> weakTeachingTip;
+	{
+		// 创建新的 TeachingTip
+		MUXC::TeachingTip newTeachingTip = FindName(L"MessageTeachingTip").as<MUXC::TeachingTip>();
+		MessageTextBlock().Text(message);
+		newTeachingTip.IsOpen(true);
+
+		// !!! HACK !!!
+		// 移除关闭按钮。必须在模板加载完成后做，TeachingTip 没有 Opening 事件，但可以监听 MessageTextBlock 的
+		// LayoutUpdated 事件，它在 TeachingTip 显示前必然会被引发。
+		MessageTextBlock().LayoutUpdated([weak(weak_ref(newTeachingTip))](IInspectable const&, IInspectable const&) {
+			auto teachingTip = weak.get();
+			if (!teachingTip) {
+				return;
+			}
+
+			IControlProtected protectedAccessor = teachingTip.as<IControlProtected>();
+
+			// 隐藏关闭按钮
+			if (DependencyObject closeButton = protectedAccessor.GetTemplateChild(L"AlternateCloseButton")) {
+				closeButton.as<FrameworkElement>().Visibility(Visibility::Collapsed);
+			}
+
+			// 减小 Flyout 尺寸
+			if (DependencyObject container = protectedAccessor.GetTemplateChild(L"TailOcclusionGrid")) {
+				container.as<FrameworkElement>().MinWidth(0.0);
+			}
+		});
+
+		weakTeachingTip = newTeachingTip;
+	}
+
+	auto weakThis = get_weak();
+	CoreDispatcher dispatcher = Dispatcher();
+	// 显示时长固定 2 秒
+	co_await 2s;
+	co_await dispatcher;
+
+	if (weakThis.get()) {
+		MUXC::TeachingTip curTeachingTip = MessageTeachingTip();
+		if (curTeachingTip == weakTeachingTip.get()) {
+			// 如果已经显示新的 Toast 则无需关闭，因为 newTeachingTip 已被卸载（但仍在生存期内）
+			curTeachingTip.IsOpen(false);
+		}
+	}
+}
+
 }

src/Magpie.App/ToastPage.h

@@ -2,12 +2,16 @@
 #include "ToastPage.g.h"
 
 namespace winrt::Magpie::App::implementation {
-    struct ToastPage : ToastPageT<ToastPage> {
-
-    };
+
+struct ToastPage : ToastPageT<ToastPage> {
+    IAsyncAction ShowMessage(const hstring& message);
+};
+
 }
 
 namespace winrt::Magpie::App::factory_implementation {
-    struct ToastPage : ToastPageT<ToastPage, implementation::ToastPage> {
-    };
+
+struct ToastPage : ToastPageT<ToastPage, implementation::ToastPage> {
+};
+
 }

src/Magpie.App/ToastPage.idl

@@ -1,7 +1,8 @@
 namespace Magpie.App {
-    [default_interface]
     runtimeclass ToastPage : Windows.UI.Xaml.Controls.Page {
         ToastPage();
+
+        Windows.Foundation.IAsyncAction ShowMessage(String message);
 
         // https://github.com/microsoft/microsoft-ui-xaml/issues/7579
         void UnloadObject(Windows.UI.Xaml.DependencyObject object);

src/Magpie.App/ToastPage.xaml

@@ -7,9 +7,9 @@
       xmlns:muxc="using:Microsoft.UI.Xaml.Controls"
       mc:Ignorable="d">
 	<muxc:TeachingTip x:Name="MessageTeachingTip"
+	                  x:Load="False"
 	                  PreferredPlacement="Center"
 	                  ShouldConstrainToRootBounds="False">
-		<TextBlock x:Name="MessageTextBlock"
-		           Text="test测试测试测试测试测试测试" />
+		<TextBlock x:Name="MessageTextBlock" />
 	</muxc:TeachingTip>
 </Page>

src/Magpie.App/ToastService.cpp

@@ -36,6 +36,12 @@ void ToastService::Uninitialize() noexcept {
 	_toastThread.join();
 }
 
+void ToastService::ShowMessage(std::wstring_view message) noexcept {
+	_Dispatcher().TryRunAsync(CoreDispatcherPriority::Normal, [this, captured(std::wstring(message))]() {
+		_toastPage.ShowMessage(captured);
+	});
+}
+
 void ToastService::_ToastThreadProc() noexcept {
 #ifdef _DEBUG
 	SetThreadDescription(GetCurrentThread(), L"Toast 线程");
@@ -58,11 +64,11 @@ void ToastService::_ToastThreadProc() noexcept {
 	// 创建窗口失败也应进入消息循环。Win10 中关闭任意线程的 DesktopWindowXamlSource 都会使主线程会崩溃，
 	// 在程序退出前，xamlSource 不能析构。见 https://github.com/microsoft/terminal/pull/15397
 	HWND hwndToast = CreateWindowEx(
-		WS_EX_NOREDIRECTIONBITMAP | WS_EX_TOOLWINDOW,
+		WS_EX_TOPMOST | WS_EX_NOREDIRECTIONBITMAP | WS_EX_TOOLWINDOW,
 		CommonSharedConstants::TOAST_WINDOW_CLASS_NAME,
 		L"Toast",
 		WS_POPUP | WS_VISIBLE,
-		200, 200, 0, 0,
+		0, 0, 0, 0,
 		NULL,
 		NULL,
 		wil::GetModuleInstanceHandle(),
@@ -80,11 +86,13 @@ void ToastService::_ToastThreadProc() noexcept {
 	xamlSourceNative2->get_WindowHandle(&hwndXamlIsland);
 	SetWindowPos(hwndXamlIsland, NULL, 0, 0, 0, 0, SWP_NOACTIVATE | SWP_NOZORDER | SWP_SHOWWINDOW);
 
-	ToastPage toastPage;
-	xamlSource.Content(toastPage);
+	_toastPage = ToastPage();
+	xamlSource.Content(_toastPage);
 
-	auto tt = toastPage.FindName(L"MessageTeachingTip").as<MUXC::TeachingTip>();
-	tt.IsOpen(true);
+	_dispatcher = _toastPage.Dispatcher();
+	// 如果主线程正在等待则唤醒主线程
+	_dispatcherInitialized.store(true, std::memory_order_release);
+	_dispatcherInitialized.notify_one();
 
 	MSG msg;
 	while (GetMessage(&msg, nullptr, 0, 0)) {
@@ -110,4 +118,13 @@ void ToastService::_ToastThreadProc() noexcept {
 	xamlSource.Close();
 }
 
+const CoreDispatcher& ToastService::_Dispatcher() noexcept {
+	if (!_dispatcherInitializedCache) {
+		_dispatcherInitialized.wait(false, std::memory_order_acquire);
+		_dispatcherInitializedCache = true;
+	}
+
+	return _dispatcher;
+}
+
 }

src/Magpie.App/ToastService.h

@@ -17,12 +17,23 @@ class ToastService {
 
 	void Uninitialize() noexcept;
 
+	void ShowMessage(std::wstring_view message) noexcept;
+
 private:
 	ToastService() = default;
 
 	void _ToastThreadProc() noexcept;
 
+	// 确保 _dispatcher 完成初始化
+	const CoreDispatcher& _Dispatcher() noexcept;
+
 	std::thread _toastThread;
+
+	ToastPage _toastPage{ nullptr };
+	CoreDispatcher _dispatcher{ nullptr };
+	std::atomic<bool> _dispatcherInitialized = false;
+	// 只能在主线程访问，省下检查 _dispatcherInitialized 的开销
+	bool _dispatcherInitializedCache = false;
 };
 
 }