From c72b9f65ecf8cb637381633c347a3768f10dcc01 Mon Sep 17 00:00:00 2001
From: Jonas Kümmerlin <jonas@kuemmerlin.eu>
Date: Fri, 1 May 2020 20:14:26 +0200
Subject: groupbox: uxtheme support

disabled state looks different to original (where it looks the same
as the enabled state), but I like it better that way.
---
 alf/alfgroupbox.cpp | 95 +++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 85 insertions(+), 10 deletions(-)

(limited to 'alf')

diff --git a/alf/alfgroupbox.cpp b/alf/alfgroupbox.cpp
index a2dfb9b..fe49993 100644
--- a/alf/alfgroupbox.cpp
+++ b/alf/alfgroupbox.cpp
@@ -1,5 +1,10 @@
 #include "alfpriv.h"
 
+#define BP_GROUPBOX 4
+#define GBS_NORMAL 1
+#define GBS_DISABLED 2
+#define TMT_TEXTCOLOR 3803
+
 TCHAR *_alf_groupboxClass = NULL;
 
 typedef struct {
@@ -17,6 +22,8 @@ static void ALF_GroupBox_EndCalcSizes(ALFLayout *layout, HWND hwnd, SIZE *contai
 
 static void ALF_GroupBox_PreContainerWidgetApplyPos(ALFLayout *layout, HWND groupbox, HWND child, RECT *r);
 
+static void ALF_GroupBox_HandleThemeChange(ALFGroupBoxPriv *priv, HWND hwnd);
+
 static void
 ALF_GroupBox_IntializePriv(ALFGroupBoxPriv *priv, HWND window, const TCHAR *text)
 {
@@ -28,18 +35,63 @@ ALF_GroupBox_IntializePriv(ALFGroupBoxPriv *priv, HWND window, const TCHAR *text
 
     priv->label = ALF_AddLabel(window, (WORD)-1, -1, -1, text);
     ALF_LabelSetStyle(priv->label, ALF_LABEL_ALIGN_LEFT | ALF_LABEL_ALIGN_TOP);
+
+    ALF_GroupBox_HandleThemeChange(priv, window);
 }
 
 static void
 ALF_GroupBox_ClearPriv(ALFGroupBoxPriv *priv)
 {
     ALF_Layout_Clear(&priv->layout);
+    ALF_Compat_CloseThemeData(priv->theme);
 }
 
 static void
-ALF_GroupBox_PaintFrameClassic(ALFGroupBoxPriv *priv, HWND hwnd, HDC dc)
+ALF_GroupBox_PaintFrameUxtheme(ALFGroupBoxPriv *priv, HWND hwnd, HDC dc, RECT *rcPaint)
 {
-    (void)priv;
+    int state = IsWindowEnabled(hwnd) ? GBS_NORMAL : GBS_DISABLED;
+
+    if (ALF_Compat_IsThemeBackgroundPartiallyTransparent(priv->theme, BP_GROUPBOX, state)) {
+        if (priv->layout.bgcolor == ALF_COLOR_TRANSPARENT) {
+            ALF_Compat_DrawThemeParentBackground(hwnd, dc, rcPaint);
+        } else {
+            ALF_FillRect(dc, rcPaint, priv->layout.bgcolor);
+        }
+    }
+
+    RECT rc;
+    GetClientRect(hwnd, &rc);
+
+    rc.top += priv->calculatedLabelSize.cy / 2;
+
+    HRGN oldClipR = CreateRectRgn(0, 0, 0, 0);
+    if (!GetClipRgn(dc, oldClipR)) {
+        DeleteRgn(oldClipR);
+        oldClipR = NULL;
+    }
+
+    RECT rcLabel;
+    GetWindowRect(priv->label, &rcLabel);
+    MapWindowRect(NULL, hwnd, &rcLabel);
+
+    rcLabel.left -= 2;  // FIXME: is this correct?
+    rcLabel.right += 2;
+
+    ExcludeClipRect(dc, rcLabel.left, rcLabel.top, rcLabel.right, rcLabel.bottom);
+
+    ALF_Compat_DrawThemeBackground(priv->theme, dc, BP_GROUPBOX, state, &rc, rcPaint);
+
+    SelectClipRgn(dc, oldClipR);
+}
+
+static void
+ALF_GroupBox_PaintFrameClassic(ALFGroupBoxPriv *priv, HWND hwnd, HDC dc, RECT *rcPaint)
+{
+    if (priv->layout.bgcolor == ALF_COLOR_TRANSPARENT) {
+        ALF_Compat_DrawThemeParentBackground(hwnd, dc, rcPaint);
+    } else {
+        ALF_FillRect(dc, rcPaint, priv->layout.bgcolor);
+    }
 
     HFONT oldfont = SelectFont(dc, priv->layout.font);
 
@@ -74,14 +126,10 @@ ALF_GroupBox_PaintFrameClassic(ALFGroupBoxPriv *priv, HWND hwnd, HDC dc)
 static void
 ALF_GroupBox_Paint(ALFGroupBoxPriv *priv, HWND hwnd, HDC dc, RECT *r)
 {
-    if (priv->layout.bgcolor == ALF_COLOR_TRANSPARENT) {
-        ALF_Compat_DrawThemeParentBackground(hwnd, dc, r);
-    } else {
-        ALF_FillRect(dc, r, priv->layout.bgcolor);
-    }
-
-    // unthemed paint
-    ALF_GroupBox_PaintFrameClassic(priv, hwnd, dc);
+    if (priv->theme)
+        ALF_GroupBox_PaintFrameUxtheme(priv, hwnd, dc, r);
+    else
+        ALF_GroupBox_PaintFrameClassic(priv, hwnd, dc, r);
 }
 
 static void
@@ -149,6 +197,29 @@ static void ALF_GroupBox_PreContainerWidgetApplyPos(ALFLayout *layout, HWND grou
     }
 }
 
+static void
+ALF_GroupBox_HandleThemeChange(ALFGroupBoxPriv *priv, HWND hwnd)
+{
+    if (priv->theme)
+        ALF_Compat_CloseThemeData(priv->theme);
+
+    priv->theme = NULL;
+
+    if (ALF_Compat_IsAppThemed())
+        priv->theme = ALF_Compat_OpenThemeData(hwnd, L"BUTTON");
+
+    InvalidateRect(hwnd, NULL, TRUE);
+
+    if (priv->theme) {
+        COLORREF textcolor = (COLORREF)ALF_COLOR_SYS(COLOR_BTNTEXT);
+        ALF_Compat_GetThemeColor(priv->theme, BP_GROUPBOX, GBS_NORMAL, TMT_TEXTCOLOR, &textcolor);
+
+        ALF_SetTextColor(priv->label, (ALFColor)textcolor);
+    } else {
+        ALF_SetTextColor(priv->label, ALF_COLOR_SYS(COLOR_BTNTEXT));
+    }
+}
+
 static LRESULT WINAPI
 ALF_GroupBox_WindowProc(HWND window, UINT msg, WPARAM wparam, LPARAM lparam)
 {
@@ -246,6 +317,10 @@ ALF_GroupBox_WindowProc(HWND window, UINT msg, WPARAM wparam, LPARAM lparam)
         ALF_Layout_Apply(&priv->layout, window);
     }
 
+    if (msg == WM_THEMECHANGED) {
+        ALF_GroupBox_HandleThemeChange(priv, window);
+    }
+
     if (msg == WM_ENABLE) {
         EnableWindow(priv->label, (BOOL)wparam);
     }
-- 
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