[PATCH v2 0/1] MR1878: comctl32/listview: Draw border and background separately in WM_NCPAINT.

[Vladislav Timonin (＠vt)]

Depending on the theme, if there was a header,
the border ends up painted lower than it should be,
and clipped by the header.

7-Zip file manager, the reason why the offset was added in 5f0dcf79185941c4faff35d1cc9c758160f3a27d in the first place, still renders correctly.

Before:

![before](/uploads/8321f45c657469278b2787edfa147b20/before.png)

After:

![after](/uploads/013241f4cd3b893c7f4073b6a9fe8119/after.png)

EDIT1:
Actually compared screenshots of 7-Zip file manager and looks like the headers are now painted consistently after highlighting them.

![7zFM-before-hilite](/uploads/64fe3fb80002c847c2e9270337bab4e8/7zFM-before-hilite.png)

![7zFM-after-hilite](/uploads/4db4778c2ad6d27eddbd4a1202b41881/7zFM-after-hilite.png)

--
  v2: comctl32/listview: Exclude header area in WM_NCPAINT.

https://gitlab.winehq.org/wine/wine/-/merge_requests/1878

[PATCH v2 1/1] comctl32/listview: Exclude header area in WM_NCPAINT.

[Vladislav Timonin]

From: Vladislav Timonin

An improvement of 5f0dcf79185941c4faff35d1cc9c758160f3a27d,
which, depending on theme, had an issue with
drawing the top border clipped inside the header.
---
 dlls/comctl32/listview.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/dlls/comctl32/listview.c b/dlls/comctl32/listview.c
index 7c394d60273..1e9522de012 100644
--- a/dlls/comctl32/listview.c
+++ b/dlls/comctl32/listview.c
@@ -10712,15 +10712,21 @@ static LRESULT LISTVIEW_NCPaint(const LISTVIEW_INFO *infoPtr, HRGN region)
     if (region != (HRGN)1)
         CombineRgn (cliprgn, cliprgn, region, RGN_AND);

-    OffsetRect(&r, -r.left, -r.top);
+    dc = GetDCEx(infoPtr->hwndSelf, region, DCX_WINDOW | DCX_INTERSECTRGN);
     if (infoPtr->hwndHeader && LISTVIEW_IsHeaderEnabled(infoPtr))
     {
+        LONG border_cx, border_cy;
+
         GetWindowRect(infoPtr->hwndHeader, &window_rect);
-        r.top = min(r.bottom, r.top + window_rect.bottom - window_rect.top);
-    }
+        border_cx = window_rect.left - r.left;
+        border_cy = window_rect.top - r.top;

-    dc = GetDCEx(infoPtr->hwndSelf, region, DCX_WINDOW|DCX_INTERSECTRGN);
+        OffsetRect(&window_rect, -window_rect.left, -window_rect.top);
+        OffsetRect(&window_rect, border_cx, border_cy);
+        ExcludeClipRect(dc, window_rect.left, window_rect.top, window_rect.right, window_rect.bottom);
+    }

+    OffsetRect(&r, -r.left, -r.top);
     if (IsThemeBackgroundPartiallyTransparent (theme, 0, 0))
         DrawThemeParentBackground(infoPtr->hwndSelf, dc, &r);
     DrawThemeBackground (theme, dc, 0, 0, &r, 0);

[PATCH v2 0/1] MR1878: comctl32/listview: Exclude header area in WM_NCPAINT.

[Vladislav Timonin (＠vt)]

Was pointed out that the `DTBG_OMITCONTENT`/`DTBG_OMITBORDER` approach wasn't handling `BT_IMAGEFILE` quite right. So clipping it is.

[PATCH v2 0/1] MR1878: comctl32/listview: Exclude header area in WM_NCPAINT.

[Zhiyi Zhang (＠zhiyi)]

Zhiyi Zhang (@zhiyi) commented about dlls/comctl32/listview.c:
> - OffsetRect(&r, -r.left, -r.top);
> - dc = GetDCEx(infoPtr->hwndSelf, region, DCX_WINDOW | DCX_INTERSECTRGN);
> if (infoPtr->hwndHeader && LISTVIEW_IsHeaderEnabled(infoPtr))
> {
> -
>    LONG border_cx, border_cy;
> -
>    GetWindowRect(infoPtr->hwndHeader, &window_rect);
> -
>    r.top = min(r.bottom, r.top + window_rect.bottom - window_rect.top);
> - }
> -
>    border_cx = window_rect.left - r.left;
> -
>    border_cy = window_rect.top - r.top;
>
> - dc = GetDCEx(infoPtr->hwndSelf, region, DCX_WINDOW|DCX_INTERSECTRGN);
> -
>    OffsetRect(&window_rect, -window_rect.left, -window_rect.top);
> -
>    OffsetRect(&window_rect, border_cx, border_cy);

These two lines can be replaced with OffsetRect(&window_rect, -r.left, -r.top); and you can remove border_cx/cy.

Otherwise, the patch looks good to me.