Colin Watson suggests that Alt-click (or Option-click) could

usefully be equivalent to right-clicking on platforms other than OS
X; in particular, it's useful if you're running Linux on Apple
hardware such as PowerBook which inherently has only one button. So
here's the fix for GTK, and Windows as well (the latter for
completeness and consistency, not because I can actually think of
any reason somebody might be running Windows on one-button
hardware).

[originally from svn r5907]

1 files changed, 22 insertions, 9 deletions

diff --git a/windows.c b/windows.c
index 430fff0..be1f17c 100644
--- a/windows.c
+++ b/windows.c
@@ -1107,6 +1107,19 @@ static void new_game_type(frontend *fe)
     midend_redraw(fe->me);
 }
 
+static int is_alt_pressed(void)
+{
+    BYTE keystate[256];
+    int r = GetKeyboardState(keystate);
+    if (!r)
+	return FALSE;
+    if (keystate[VK_MENU] & 0x80)
+	return TRUE;
+    if (keystate[VK_RMENU] & 0x80)
+	return TRUE;
+    return FALSE;
+}
+
 static LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
 				WPARAM wParam, LPARAM lParam)
 {
@@ -1316,10 +1329,10 @@ static LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
 	     */
 	    if (message == WM_MBUTTONDOWN || (wParam & MK_SHIFT))
 		button = MIDDLE_BUTTON;
-	    else if (message == WM_LBUTTONDOWN)
-		button = LEFT_BUTTON;
-	    else
+	    else if (message == WM_RBUTTONDOWN || is_alt_pressed())
 		button = RIGHT_BUTTON;
+	    else
+		button = LEFT_BUTTON;
 
 	    if (!midend_process_key(fe->me, (signed short)LOWORD(lParam),
 				    (signed short)HIWORD(lParam), button))
@@ -1341,10 +1354,10 @@ static LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
 	     */
 	    if (message == WM_MBUTTONUP || (wParam & MK_SHIFT))
 		button = MIDDLE_RELEASE;
-	    else if (message == WM_LBUTTONUP)
-		button = LEFT_RELEASE;
-	    else
+	    else if (message == WM_RBUTTONUP || is_alt_pressed())
 		button = RIGHT_RELEASE;
+	    else
+		button = LEFT_RELEASE;
 
 	    if (!midend_process_key(fe->me, (signed short)LOWORD(lParam),
 				    (signed short)HIWORD(lParam), button))
@@ -1359,10 +1372,10 @@ static LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
 
 	    if (wParam & (MK_MBUTTON | MK_SHIFT))
 		button = MIDDLE_DRAG;
-	    else if (wParam & MK_LBUTTON)
-		button = LEFT_DRAG;
-	    else
+	    else if (wParam & MK_RBUTTON || is_alt_pressed())
 		button = RIGHT_DRAG;
+	    else
+		button = LEFT_DRAG;
 	    
 	    if (!midend_process_key(fe->me, (signed short)LOWORD(lParam),
 				    (signed short)HIWORD(lParam), button))