Allow mouse clicks only when focused.

Fixes #6486.

Windows/RawInput.cpp

@@ -58,6 +58,8 @@ namespace WindowsRawInput {
 	static void *rawInputBuffer;
 	static size_t rawInputBufferSize;
 	static bool menuActive;
+	static bool focused = true;
+	static bool mouseRightDown = false;
 
 	void Init() {
 		RAWINPUTDEVICE dev[3];
@@ -171,7 +173,18 @@ namespace WindowsRawInput {
 		return 0;
 	}
 
-	void ProcessMouse(RAWINPUT *raw, bool foreground) {
+	static bool MouseInWindow(HWND hWnd) {
+		POINT pt;
+		if (GetCursorPos(&pt) != 0) {
+			RECT rt;
+			if (GetWindowRect(hWnd, &rt) != 0) {
+				return PtInRect(&rt, pt) != 0;
+			}
+		}
+		return true;
+	}
+
+	void ProcessMouse(HWND hWnd, RAWINPUT *raw, bool foreground) {
 		if (menuActive && UpdateMenuActive()) {
 			// Ignore mouse input while a menu is active, it's probably interacting with the menu.
 			return;
@@ -193,12 +206,27 @@ namespace WindowsRawInput {
 			key.flags = KEY_DOWN;
 			key.keyCode = windowsTransTable[VK_RBUTTON];
 			NativeTouch(touch);
-			NativeKey(key);
+			if (MouseInWindow(hWnd)) {
+				NativeKey(key);
+			}
+			mouseRightDown = true;
 		} else if (raw->data.mouse.usButtonFlags & RI_MOUSE_RIGHT_BUTTON_UP) {
 			key.flags = KEY_UP;
 			key.keyCode = windowsTransTable[VK_RBUTTON];
 			NativeTouch(touch);
-			NativeKey(key);
+			if (MouseInWindow(hWnd)) {
+				if (!mouseRightDown) {
+					// This means they were focused outside, and right clicked inside.
+					// Seems intentional, so send a down first.
+					key.flags = KEY_DOWN;
+					NativeKey(key);
+					key.flags = KEY_UP;
+					NativeKey(key);
+				} else {
+					NativeKey(key);
+				}
+			}
+			mouseRightDown = false;
 		}
 
 		// TODO : Smooth and translate to an axis every frame.
@@ -229,7 +257,7 @@ namespace WindowsRawInput {
 			break;
 
 		case RIM_TYPEMOUSE:
-			ProcessMouse(raw, foreground);
+			ProcessMouse(hWnd, raw, foreground);
 			break;
 
 		case RIM_TYPEHID:
@@ -241,6 +269,10 @@ namespace WindowsRawInput {
 		return DefWindowProc(hWnd, WM_INPUT, wParam, lParam);
 	}
 
+	void GainFocus() {
+		focused = true;
+	}
+
 	void LoseFocus() {
 		// Force-release all held keys on the keyboard to prevent annoying stray inputs.
 		KeyInput key;
@@ -250,6 +282,7 @@ namespace WindowsRawInput {
 			key.keyCode = *i;
 			NativeKey(key);
 		}
+		focused = false;
 	}
 
 	void NotifyMenu() {

Windows/RawInput.h

@@ -22,6 +22,7 @@ namespace WindowsRawInput {
 	LRESULT Process(HWND hWnd, WPARAM wParam, LPARAM lParam);
 	// Not actually RawInput but it kinda belongs here anyway.
 	LRESULT ProcessChar(HWND hWnd, WPARAM wParam, LPARAM lParam);
+	void GainFocus();
 	void LoseFocus();
 	void NotifyMenu();
 	void Shutdown();

Windows/WndMainWindow.cpp

@@ -1083,6 +1083,7 @@ namespace MainWindow
 			{
 				bool pause = true;
 				if (wParam == WA_ACTIVE || wParam == WA_CLICKACTIVE) {
+					WindowsRawInput::GainFocus();
 					InputDevice::GainFocus();
 					g_activeWindow = WINDOW_MAINWINDOW;
 					pause = false;