paweld/lazarus
1
0
Fork 0
mirror of https://gitlab.com/freepascal.org/lazarus/lazarus.git synced 2025-06-01 16:12:36 +02:00
Code Issues Packages Projects Releases Wiki Activity

LCL/Win32: Fix drawing artefacts of ComboBox in Windows when style is csSimple and static listbox is visible. Issue #37129, patch by Jamie Philbrook.

Browse Source 
git-svn-id: trunk@63251 -
This commit is contained in:
wp 2020-05-30 16:13:11 +00:00
parent 6e4dbe9fd0
commit 102cb0b364
1 changed files with 33 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
lcl/interfaces/win32/win32wsstdctrls.pp
View File

@ -426,6 +426,31 @@ begin
LMessage.Result := 0;
Exit(DeliverMessage(WindowInfo^.WinControl, LMessage));
end;
// WM_SETFONT and WM_SIZE were added due to csSimple issue #37129
WM_SETFONT:
begin
Result := WindowProc(Window, Msg, WParam, LParam);
WindowInfo := GetWin32WIndowInfo(Window);
if TCustomComBoBox(WindowInfo^.WinControl).Style = csSimple then
with WindowInfo^.WinControl do
begin {LCL is blocking the size change so we trick it}
SendMessage(Window,CB_SETDROPPEDWIDTH, WIdth, 0);
MoveWindow(Handle, left, Top, Width, Height-1, False); {Trick the No size lock}
MoveWindow(Handle, Left, Top, Width, Height+1, False);{ Won't change otherwise}
end;
Exit;
end;
WM_SIZE: { Added for csSimple border painting with the list in view}
begin
Result := WindowProc(Window, Msg, WParam, LParam); //call original firt;
WindowInfo := GetWin32WindowInfo(Window);
if TCustomcombobox(WindowInfo^.WinControl).Style = csSimple then
begin
InvalidateRect(WindowInfo^.WinControl.Handle, nil, true); {border does not paint properly otherwise}
end;
Exit;
end;
end;
// normal processing
Result := WindowProc(Window, Msg, WParam, LParam);
@ -975,6 +1000,14 @@ begin
pSubClassName := LCLComboboxClsName;
SubClassWndProc := @ComboBoxWindowProc;
end;
// issue #37129: Fix static listbox of style csSimple when height is changed (like in Delphi)
if (CBS_SIMPLE and Params.flags) <> 0 Then
begin
Params.Flags := Params.Flags or CBS_NOINTEGRALHEIGHT;
Include(TWinControlAccess(AWinControl).FWinControlFlags, wcfEraseBackground);
end;
// create window
FinishCreateWindow(AWinControl, Params, False, True);