Window resizing
Duane Clark
dclark at akamail.com
Sat Feb 8 16:57:12 CST 2003
When resizing a client window, a WM_SYSCOMMAND message is sent with a
value in wParam indicating which border or corner is being sized. All
the MSDN says (as far as I can see) about the value to use is "In
WM_SYSCOMMAND messages, the four low-order bits of the wParam parameter
are used internally by the system."
So at some point it was apparently decided to arbitrarily pick an
encoding. The encoding used was SC_SIZE + wParam - 2. However, Visual
FoxPro handles the generation of WM_SYSCOMMAND messages itself, and uses
a different value. Testing with SPY++ under WinNT shows that when WinNT
sends the message, it encodes wParam as
SC_SIZE+wParam-(HTLEFT-WMSZ_LEFT). And this matches what Visual FoxPro
generates, so that looks like the correct value to use.
Changelog:
Correctly encode wParam for WM_SYSCOMMAND messages.
-------------- next part --------------
Index: dlls/x11drv/winpos.c
===================================================================
RCS file: /home/wine/wine/dlls/x11drv/winpos.c,v
retrieving revision 1.63
diff -u -r1.63 winpos.c
--- dlls/x11drv/winpos.c 8 Jan 2003 21:09:26 -0000 1.63
+++ dlls/x11drv/winpos.c 8 Feb 2003 22:44:11 -0000
@@ -1901,7 +1903,8 @@
else /* SC_SIZE */
{
if (!thickframe) return;
- if ( hittest && hittest != HTSYSMENU ) hittest += 2;
+ if ( hittest && ((wParam & 0xfff0) != SC_MOUSEMENU) )
+ hittest += (HTLEFT - WMSZ_LEFT);
else
{
set_movesize_capture( hwnd );
Index: windows/nonclient.c
===================================================================
RCS file: /home/wine/wine/windows/nonclient.c,v
retrieving revision 1.109
diff -u -r1.109 nonclient.c
--- windows/nonclient.c 14 Jan 2003 23:41:01 -0000 1.109
+++ windows/nonclient.c 8 Feb 2003 22:44:12 -0000
@@ -2071,8 +2071,15 @@
case HTBOTTOM:
case HTBOTTOMLEFT:
case HTBOTTOMRIGHT:
- /* make sure hittest fits into 0xf and doesn't overlap with HTSYSMENU */
- SendMessageW( hwnd, WM_SYSCOMMAND, SC_SIZE + wParam - 2, lParam);
+ /* Old comment:
+ * "make sure hittest fits into 0xf and doesn't overlap with HTSYSMENU"
+ * This was previously done by setting wParam=SC_SIZE + wParam - 2
+ */
+ /* But that is not what WinNT does. Instead it sends this. This
+ * is easy to differentiate from HTSYSMENU, because HTSYSMENU adds
+ * SC_MOUSEMENU into wParam.
+ */
+ SendMessageW( hwnd, WM_SYSCOMMAND, SC_SIZE + wParam - (HTLEFT-WMSZ_LEFT), lParam);
break;
case HTBORDER:
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