diff options
| -rw-r--r-- | wintable/main.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/wintable/main.c b/wintable/main.c index a17e45b..b469ad6 100644 --- a/wintable/main.c +++ b/wintable/main.c @@ -31,24 +31,36 @@ struct table { intptr_t count; }; -static void drawItems(struct table *t, HDC dc) +static void drawItems(struct table *t, HDC dc, RECT cliprect) { HFONT thisfont, prevfont; TEXTMETRICW tm; LONG y; intptr_t i; RECT r; + intptr_t first, last; + // TODO eliminate the need (only use cliprect) if (GetClientRect(t->hwnd, &r) == 0) abort(); + thisfont = t->font; // in case WM_SETFONT happens before we return prevfont = (HFONT) SelectObject(dc, thisfont); if (prevfont == NULL) abort(); if (GetTextMetricsW(dc, &tm) == 0) abort(); + + // see http://blogs.msdn.com/b/oldnewthing/archive/2003/07/29/54591.aspx and http://blogs.msdn.com/b/oldnewthing/archive/2003/07/30/54600.aspx + first = cliprect.top / tm.tmHeight; + if (first < 0) + first = 0; + last = (cliprect.bottom + tm.tmHeight - 1) / tm.tmHeight; + if (last >= t->count) + last = t->count; + y = 0; - for (i = 0; i < t->count; i++) { + for (i = first; i < last; i++) { RECT rsel; HBRUSH background; @@ -69,6 +81,7 @@ static void drawItems(struct table *t, HDC dc) TextOutW(dc, r.left, y, L"Item", 4); y += tm.tmHeight; } + if (SelectObject(dc, prevfont) != (HGDIOBJ) (thisfont)) abort(); } @@ -99,7 +112,7 @@ t->selected = 5;t->count=100;//TODO dc = BeginPaint(hwnd, &ps); if (dc == NULL) abort(); - drawItems(t, dc); + drawItems(t, dc, ps.rcPaint); EndPaint(hwnd, &ps); return 0; case WM_SETFONT: @@ -128,6 +141,7 @@ void makeTableWindowClass(void) wc.hCursor = LoadCursorW(NULL, IDC_ARROW); wc.hIcon = LoadIconW(NULL, IDI_APPLICATION); wc.hbrBackground = (HBRUSH) (COLOR_WINDOW + 1); // TODO correct? + wc.style = CS_HREDRAW | CS_VREDRAW; wc.hInstance = GetModuleHandle(NULL); if (RegisterClassW(&wc) == 0) abort(); |