add explicit functions for adding native buttons

1 files changed, 43 insertions, 0 deletions

diff --git a/alf/alflayout.cpp b/alf/alflayout.cpp
index 470f728..974cd78 100644
--- a/alf/alflayout.cpp
+++ b/alf/alflayout.cpp
@@ -257,6 +257,46 @@ ALF_Layout_CalcCheckboxSize(HWND hwndWindow, ALFLayout *layout, HWND hwndCheckbo
 }
 
 static void
+ALF_Layout_CalcButtonSize(HWND hwndWindow, ALFLayout *layout, HWND hwndButton, SIZE *pSize)
+{
+    (void)hwndWindow;
+
+    HDC hdc = GetDC(hwndButton);
+    HFONT oldFont = SelectFont(hdc, (HFONT)SendMessage(hwndButton, WM_GETFONT, 0, 0));
+
+    // calc drawtext style
+    UINT format = DT_LEFT | DT_EXPANDTABS | DT_CALCRECT;
+
+    if (!(GetWindowLong(hwndButton, GWL_STYLE) & BS_MULTILINE))
+        format |= DT_SINGLELINE;
+
+    RECT r = { 0, 0, 0x7FFFFFFF, 100 };
+
+    TCHAR *textbuf = ALF_Text(hwndButton);
+    DrawText(hdc, textbuf, -1, &r, format);
+    ALF_Free(textbuf);
+
+    int xpadding = ALF_Compat_GetSystemMetricsForDpi(SM_CXEDGE,
+        (UINT)layout->dpi) * 2 + 6;
+    int ypadding = ALF_Compat_GetSystemMetricsForDpi(SM_CYEDGE,
+        (UINT)layout->dpi) * 2 + 4;
+
+    if (pSize->cx < r.right - r.left + xpadding) {
+        pSize->cx = r.right - r.left + xpadding;
+    }
+    if (pSize->cy < r.bottom - r.top + ypadding) {
+        pSize->cy = r.bottom - r.top + ypadding;
+    }
+    if (pSize->cx < pSize->cy) {
+        pSize->cx = pSize->cy;
+    }
+
+    SelectFont(hdc, oldFont);
+
+    ReleaseDC(hwndButton, hdc);
+}
+
+static void
 ALF_Layout_CalcMinWidgetSize(ALFLayout *layout, ALFWidgetPriv *c, HWND window, SIZE *s)
 {
     if (c->flags & ALF_LAYOUT_SIZE_PX) {
@@ -280,6 +320,9 @@ ALF_Layout_CalcMinWidgetSize(ALFLayout *layout, ALFWidgetPriv *c, HWND window, S
         case ALF_LAYOUT_SIZE_CHECKBOX:
             ALF_Layout_CalcCheckboxSize(window, layout, c->hwnd, s);
             break;
+        case ALF_LAYOUT_SIZE_PUSHBUTTON:
+            ALF_Layout_CalcButtonSize(window, layout, c->hwnd, s);
+            break;
         default:
             // FIXME! unimplemented
             break;