Merge pull request #19605 from hrydgard/imgui-integration-work

ImGui integretion: Implement mousewheel and mouse hover

Common/Input/InputState.h

@@ -180,6 +180,11 @@ struct KeyInput {
 		int unicodeChar;  // for KEY_CHAR
 	};
 	int flags;
+
+	// Used by mousewheel events. The delta is packed in the upper 16 bits of flags.
+	int Delta() const {
+		return flags >> 16;
+	}
 };
 
 struct AxisInput {

Common/UI/View.cpp

@@ -1413,6 +1413,7 @@ bool TriggerButton::Touch(const TouchInput &input) {
 			down_ |= 1 << input.id;
 		}
 	}
+
 	if (input.flags & TOUCH_MOVE) {
 		if (contains)
 			down_ |= 1 << input.id;

SDL/SDLMain.cpp

@@ -195,7 +195,11 @@ static void UpdateScreenDPI(SDL_Window *window) {
 		SDL_GL_GetDrawableSize(window, &drawable_width, NULL);
 	else if (g_Config.iGPUBackend == (int)GPUBackend::VULKAN)
 		SDL_Vulkan_GetDrawableSize(window, &drawable_width, NULL);
-
+	else {
+		// If we add SDL support for more platforms, we'll end up here.
+		g_DesktopDPI = 1.0f;
+		return;
+	}
 	// Round up a little otherwise there would be a gap sometimes
 	// in fractional scaling
 	g_DesktopDPI = ((float) drawable_width + 1.0f) / window_width;
@@ -729,7 +733,7 @@ struct InputStateTracker {
 		}
 	}
 
-	bool mouseDown;
+	int mouseDown;  // bitflags
 	bool mouseCaptured;
 };
 
@@ -943,7 +947,7 @@ static void ProcessSDLEvent(SDL_Window *window, const SDL_Event &event, InputSta
 		switch (event.button.button) {
 		case SDL_BUTTON_LEFT:
 			{
-				inputTracker->mouseDown = true;
+				inputTracker->mouseDown |= 1;
 				TouchInput input{};
 				input.x = mx;
 				input.y = my;
@@ -957,6 +961,7 @@ static void ProcessSDLEvent(SDL_Window *window, const SDL_Event &event, InputSta
 			break;
 		case SDL_BUTTON_RIGHT:
 			{
+				inputTracker->mouseDown |= 2;
 				TouchInput input{};
 				input.x = mx;
 				input.y = my;
@@ -1018,21 +1023,22 @@ static void ProcessSDLEvent(SDL_Window *window, const SDL_Event &event, InputSta
 			break;
 		}
 	case SDL_MOUSEMOTION:
-		if (inputTracker->mouseDown) {
+		{
 			TouchInput input{};
 			input.x = mx;
 			input.y = my;
 			input.flags = TOUCH_MOVE | TOUCH_MOUSE;
+			input.buttons = inputTracker->mouseDown;
 			input.id = 0;
 			NativeTouch(input);
-		}
 			NativeMouseDelta(event.motion.xrel, event.motion.yrel);
 			break;
+		}
 	case SDL_MOUSEBUTTONUP:
 		switch (event.button.button) {
 		case SDL_BUTTON_LEFT:
 			{
-				inputTracker->mouseDown = false;
+				inputTracker->mouseDown &= ~1;
 				TouchInput input{};
 				input.x = mx;
 				input.y = my;
@@ -1045,6 +1051,7 @@ static void ProcessSDLEvent(SDL_Window *window, const SDL_Event &event, InputSta
 			break;
 		case SDL_BUTTON_RIGHT:
 			{
+				inputTracker->mouseDown &= ~2;
 				// Right button only emits mouse move events. This is weird,
 				// but consistent with Windows. Needs cleanup.
 				TouchInput input{};

UI/BackgroundAudio.h

@@ -46,8 +46,6 @@ public:
 	// This can be called on a thread.
 	void LoadSamplesOnThread();
 private:
-	bool samplesLoaded_ = false;
-
 	std::mutex mutex_;
 	std::vector<PlayInstance> queue_;
 	std::vector<PlayInstance> plays_;

UI/DevScreens.cpp

@@ -1149,8 +1149,8 @@ void TouchTestScreen::touch(const TouchInput &touch) {
 				found = true;
 			}
 		}
-		if (!found) {
-			WARN_LOG(Log::System, "Move without touch down: %d", touch.id);
+		if (!found && touch.buttons) {
+			WARN_LOG(Log::System, "Move with buttons %d without touch down: %d", touch.buttons, touch.id);
 		}
 	}
 	if (touch.flags & TOUCH_UP) {

Windows/MainWindow.cpp

@@ -680,7 +680,7 @@ namespace MainWindow
 				float y = (float)cursorY * g_display.dpi_scale_y;
 				WindowsRawInput::SetMousePos(x, y);
 
-				if (wParam & (MK_LBUTTON | MK_RBUTTON)) {
+				// Mouse moves now happen also when no button is pressed.
 				TouchInput touch{};
 				touch.flags = TOUCH_MOVE | TOUCH_MOUSE;
 				if (wParam & MK_LBUTTON) {
@@ -693,7 +693,6 @@ namespace MainWindow
 				touch.y = y;
 				NativeTouch(touch);
 			}
-			}
 			break;
 
 		case WM_LBUTTONUP:

Windows/RawInput.cpp

@@ -156,6 +156,7 @@ namespace WindowsRawInput {
 		{ VK_OEM_5, NKCODE_BACKSLASH },
 		{ VK_OEM_6, NKCODE_RIGHT_BRACKET },
 		{ VK_OEM_7, NKCODE_APOSTROPHE },
+		{ VK_OEM_8, NKCODE_GRAVE }, // Key left of 1 (above Q) on a lot of layouts.
 		{ VK_RETURN, NKCODE_ENTER },
 		{ VK_APPS, NKCODE_MENU }, // Context menu key, let's call this "menu".
 		{ VK_PAUSE, NKCODE_BREAK },

ext/imgui/imgui_impl_platform.cpp

@@ -11,10 +11,25 @@ void ImGui_ImplPlatform_KeyEvent(const KeyInput &key) {
 	ImGuiIO& io = ImGui::GetIO();
 
 	if (key.flags & KEY_DOWN) {
+		// Specially handle scroll events and any other special keys.
+		switch (key.keyCode) {
+		case NKCODE_EXT_MOUSEWHEEL_UP:
+			io.AddMouseWheelEvent(0, key.Delta() * 0.010f);
+			break;
+		case NKCODE_EXT_MOUSEWHEEL_DOWN:
+			io.AddMouseWheelEvent(0, -key.Delta() * 0.010f);
+			break;
+		default:
+		{
 			ImGuiKey keyCode = KeyCodeToImGui(key.keyCode);
-		if (keyCode != ImGuiKey_None) {
+			if (keyCode == ImGuiKey_None) {
+				WARN_LOG(Log::System, "Unmapped ImGui keycode conversion from %d", key.keyCode);
+			} else {
 				io.AddKeyEvent(keyCode, true);
 			}
+			break;
+		}
+		}
 	}
 	if (key.flags & KEY_UP) {
 		ImGuiKey keyCode = KeyCodeToImGui(key.keyCode);