feat: 使消息窗口显示在源窗口上方

src/Magpie.App/ScalingService.cpp

@@ -10,6 +10,7 @@
 #include "EffectsService.h"
 #include <Magpie.Core.h>
 #include "TouchHelper.h"
+#include "ToastService.h"
 
 using namespace ::Magpie::Core;
 using namespace winrt;
@@ -223,20 +224,26 @@ fire_and_forget ScalingService::_ScalingRuntime_IsRunningChanged(bool isRunning)
 	IsRunningChanged.Invoke(isRunning);
 }
 
-bool ScalingService::_StartScale(HWND hWnd, const Profile& profile) {
+static void ShowError(HWND hWnd, ScalingError error) noexcept {
+	ToastService::Get().ShowMessageOnWindow(L"缩放模式无效", hWnd);
+	Logger::Get().Error(fmt::format("缩放失败\n\t错误码: {}", (int)error));
+}
+
+void ScalingService::_StartScale(HWND hWnd, const Profile& profile) {
 	if (profile.scalingMode < 0) {
-		return false;
+		ShowError(hWnd, ScalingError::InvalidScalingMode);
+		return;
 	}
 
 	ScalingOptions options;
 	options.effects = ScalingModesService::Get().GetScalingMode(profile.scalingMode).effects;
 	if (options.effects.empty()) {
-		return false;
+		return;
 	} else {
 		for (EffectOption& effect : options.effects) {
 			if (!EffectsService::Get().GetEffect(effect.name)) {
 				// 存在无法解析的效果
-				return false;
+				return;
 			}
 		}
 	}
@@ -245,7 +252,7 @@ bool ScalingService::_StartScale(HWND hWnd, const Profile& profile) {
 	bool isTouchSupportEnabled;
 	if (!TouchHelper::TryLaunchTouchHelper(isTouchSupportEnabled)) {
 		Logger::Get().Error("TryLaunchTouchHelper 失败");
-		return false;
+		return;
 	}
 
 	options.graphicsCard = profile.graphicsCard;
@@ -316,7 +323,6 @@ bool ScalingService::_StartScale(HWND hWnd, const Profile& profile) {
 	_isAutoScaling = profile.isAutoScale;
 	_scalingRuntime->Start(hWnd, std::move(options));
 	_hwndCurSrc = hWnd;
-	return true;
 }
 
 void ScalingService::_ScaleForegroundWindow() {

src/Magpie.App/ScalingService.h

@@ -1,6 +1,7 @@
 #pragma once
 #include <winrt/Magpie.App.h>
 #include "WinRTUtils.h"
+#include "ScalingError.h"
 
 namespace Magpie::Core {
 class ScalingRuntime;
@@ -69,7 +70,7 @@ class ScalingService {
 
 	fire_and_forget _ScalingRuntime_IsRunningChanged(bool isRunning);
 
-	bool _StartScale(HWND hWnd, const Profile& profile);
+	void _StartScale(HWND hWnd, const Profile& profile);
 
 	void _ScaleForegroundWindow();
 

src/Magpie.App/ToastPage.cpp

@@ -9,7 +9,7 @@ using namespace Windows::UI::Xaml::Controls;
 
 namespace winrt::Magpie::App::implementation {
 
-IAsyncAction ToastPage::ShowMessage(const hstring& message) {
+fire_and_forget 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

src/Magpie.App/ToastPage.h

@@ -4,7 +4,7 @@
 namespace winrt::Magpie::App::implementation {
 
 struct ToastPage : ToastPageT<ToastPage> {
-    IAsyncAction ShowMessage(const hstring& message);
+    fire_and_forget ShowMessage(const hstring& message);
 };
 
 }

src/Magpie.App/ToastPage.idl

@@ -2,7 +2,7 @@ namespace Magpie.App {
     runtimeclass ToastPage : Windows.UI.Xaml.Controls.Page {
         ToastPage();
 
-        Windows.Foundation.IAsyncAction ShowMessage(String message);
+        void ShowMessage(String message);
 
         // https://github.com/microsoft/microsoft-ui-xaml/issues/7579
         void UnloadObject(Windows.UI.Xaml.DependencyObject object);

src/Magpie.App/ToastService.cpp

@@ -4,6 +4,7 @@
 #include "Utils.h"
 #include <windows.ui.xaml.hosting.desktopwindowxamlsource.h>
 #include <winrt/Windows.UI.Xaml.Hosting.h>
+#include "Win32Utils.h"
 
 using namespace winrt;
 using namespace Windows::UI::Xaml::Controls;
@@ -36,9 +37,34 @@ 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::ShowMessageOnWindow(std::wstring_view message, HWND hWnd) noexcept {
+	_Dispatcher().TryRunAsync(CoreDispatcherPriority::Normal, [this, capturedMessage(std::wstring(message)), hWnd]() {
+		RECT frameRect;
+		if (!Win32Utils::GetWindowFrameRect(hWnd, frameRect)) {
+			return;
+		}
+
+		// 更改所有者关系使弹窗始终在 hWnd 上方
+		SetWindowLongPtr(_hwndToast, GWLP_HWNDPARENT, (LONG_PTR)hWnd);
+		// _hwndToast 的输入已被附加到了 hWnd 上，这是所有者窗口的默认行为，但我们不需要。
+		// 见 https://devblogs.microsoft.com/oldnewthing/20130412-00/?p=4683
+		AttachThreadInput(
+			GetCurrentThreadId(),
+			GetWindowThreadProcessId(hWnd, nullptr),
+			FALSE
+		);
+
+		SetWindowPos(
+			_hwndToast,
+			NULL,
+			(frameRect.left + frameRect.right) / 2,
+			(frameRect.top + frameRect.bottom * 4) / 5,
+			0,
+			0,
+			SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOCOPYBITS | SWP_NOREDRAW
+		);
+
+		_toastPage.ShowMessage(capturedMessage);
 	});
 }
 
@@ -63,8 +89,8 @@ 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_TOPMOST | WS_EX_NOREDIRECTIONBITMAP | WS_EX_TOOLWINDOW,
+	_hwndToast = CreateWindowEx(
+		WS_EX_NOREDIRECTIONBITMAP | WS_EX_TOOLWINDOW | WS_EX_TRANSPARENT,
 		CommonSharedConstants::TOAST_WINDOW_CLASS_NAME,
 		L"Toast",
 		WS_POPUP | WS_VISIBLE,
@@ -80,7 +106,7 @@ void ToastService::_ToastThreadProc() noexcept {
 	com_ptr<IDesktopWindowXamlSourceNative2> xamlSourceNative2 =
 		xamlSource.try_as<IDesktopWindowXamlSourceNative2>();
 
-	xamlSourceNative2->AttachToWindow(hwndToast);
+	xamlSourceNative2->AttachToWindow(_hwndToast);
 
 	HWND hwndXamlIsland;
 	xamlSourceNative2->get_WindowHandle(&hwndXamlIsland);
@@ -97,7 +123,7 @@ void ToastService::_ToastThreadProc() noexcept {
 	MSG msg;
 	while (GetMessage(&msg, nullptr, 0, 0)) {
 		if (msg.message == CommonSharedConstants::WM_TOAST_QUIT) {
-			DestroyWindow(hwndToast);
+			DestroyWindow(_hwndToast);
 			break;
 		}
 

src/Magpie.App/ToastService.h

@@ -17,7 +17,7 @@ class ToastService {
 
 	void Uninitialize() noexcept;
 
-	void ShowMessage(std::wstring_view message) noexcept;
+	void ShowMessageOnWindow(std::wstring_view message, HWND hWnd) noexcept;
 
 private:
 	ToastService() = default;
@@ -29,11 +29,14 @@ class ToastService {
 
 	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;
+
+	// 只能在 toast 线程访问
+	ToastPage _toastPage{ nullptr };
+	HWND _hwndToast = NULL;
 };
 
 }

src/Shared/ScalingError.h

@@ -0,0 +1,21 @@
+#pragma once
+
+enum class ScalingError {
+	/////////////////////////////////////
+	// 
+	// 先决条件错误
+	// 
+	/////////////////////////////////////
+
+	// 未配置缩放模式或者缩放模式不合法
+	InvalidScalingMode,
+
+	/////////////////////////////////////
+	//
+	// 初始化错误
+	//
+	/////////////////////////////////////
+
+	// 检测到其他缩放窗口。由于不支持多实例，这个错误不应该出现
+	AlreadyScaling
+};

src/Shared/Shared.vcxitems

@@ -18,6 +18,7 @@
     <ClInclude Include="$(MSBuildThisFileDirectory)CommonPch.h" />
     <ClInclude Include="$(MSBuildThisFileDirectory)CommonSharedConstants.h" />
     <ClInclude Include="$(MSBuildThisFileDirectory)Logger.h" />
+    <ClInclude Include="$(MSBuildThisFileDirectory)ScalingError.h" />
     <ClInclude Include="$(MSBuildThisFileDirectory)SmallVector.h" />
     <ClInclude Include="$(MSBuildThisFileDirectory)StrUtils.h" />
     <ClInclude Include="$(MSBuildThisFileDirectory)Utils.h" />