From 65d9985bdcaed63b52bfe8c35c61d8a4a43a8292 Mon Sep 17 00:00:00 2001
From: Jonas Kümmerlin <jonas@kuemmerlin.eu>
Date: Tue, 28 Apr 2020 10:57:22 +0200
Subject: first try at checkbox

The size calculation is really messy and the background stuff does not
work with comctl v5. Probably need to go full owner-drawn, again.
---
 alf/alfcheckbox.cpp | 118 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 alf/alfcheckbox.cpp

(limited to 'alf/alfcheckbox.cpp')

diff --git a/alf/alfcheckbox.cpp b/alf/alfcheckbox.cpp
new file mode 100644
index 0000000..99a285f
--- /dev/null
+++ b/alf/alfcheckbox.cpp
@@ -0,0 +1,118 @@
+#include "alfpriv.h"
+
+typedef struct {
+    ALFColor bgcolor;
+    WNDPROC  origWndProc;
+} ALFCheckboxPriv;
+
+static ALFCheckboxPriv *
+ALF_Checkbox_InitializePriv(void)
+{
+    return ALF_New(ALFCheckboxPriv, 1);
+}
+
+static void
+ALF_Checkbox_FreePriv(ALFCheckboxPriv *priv)
+{
+    ALF_Free(priv);
+}
+
+static BOOL
+ALF_Checkbox_IsTransparencySupported(void)
+{
+    // FIXME: for safety, check if the control is actually a v6 control
+    return ALF_Compat_IsAppThemed();
+}
+
+static LRESULT
+ALF_Checkbox_PaintBackground(HWND window, ALFCheckboxPriv *priv, HDC hDC)
+{
+    // FIXME: Drawing the (transparent) background in WM_CTLCOLORSTATIC is
+    // only supported in a themed V6 common control
+
+    SetTextColor(hDC, GetSysColor(COLOR_BTNTEXT));
+    if (ALF_Checkbox_IsTransparencySupported()) {
+        RECT r;
+        GetClientRect(window, &r);
+
+        if (priv->bgcolor == ALF_COLOR_TRANSPARENT) {
+            ALF_Compat_DrawThemeParentBackground(window, hDC, &r);
+            SetBkMode(hDC, TRANSPARENT);
+        } else {
+            ALF_FillRect(hDC, &r, priv->bgcolor);
+            SetBkMode(hDC, OPAQUE);
+            SetBkColor(hDC, ALF_ColorToGdi(priv->bgcolor));
+        }
+        return (LRESULT)GetStockObject(HOLLOW_BRUSH);
+    } else {
+        SetBkColor(hDC, GetSysColor(COLOR_BTNFACE));
+        SetBkMode(hDC, OPAQUE);
+        return (LRESULT)GetSysColorBrush(COLOR_BTNFACE);
+    }
+}
+
+static LRESULT CALLBACK
+ALF_Checkbox_WindowProc(HWND window, UINT msg, WPARAM wparam, LPARAM lparam)
+{
+    ALFCheckboxPriv *priv = (ALFCheckboxPriv *)GetWindowLongPtr(window, GWLP_USERDATA);
+
+    if (!priv) // fuck
+        return DefWindowProc(window, msg, wparam, lparam);
+
+    if (msg == ALF_WM_SETBGCOLOR) {
+        ALFColor newColor = (ALFColor)lparam;
+        if (newColor != priv->bgcolor) {
+            priv->bgcolor = newColor;
+            if (ALF_Checkbox_IsTransparencySupported())
+                InvalidateRect(window, NULL, TRUE);
+        }
+        return TRUE;
+    }
+
+    if (msg == 0x2000 + WM_CTLCOLORSTATIC) {
+        return ALF_Checkbox_PaintBackground(window, priv, (HDC)wparam);
+    }
+
+    if (msg == ALF_WM_BACKGROUNDCHANGE) {
+        if (priv->bgcolor == ALF_COLOR_TRANSPARENT && ALF_Checkbox_IsTransparencySupported()) {
+            InvalidateRect(window, NULL, TRUE);
+        }
+        return TRUE;
+    }
+
+    if (msg == WM_THEMECHANGED) {
+        InvalidateRect(window, NULL, TRUE);
+    }
+
+    if (msg == WM_DESTROY) {
+        WNDPROC orig = priv->origWndProc;
+        SetWindowLongPtr(window, GWLP_WNDPROC, (LONG_PTR)orig);
+        SetWindowLongPtr(window, GWLP_USERDATA, 0);
+        ALF_Checkbox_FreePriv(priv);
+        return CallWindowProc(orig, window, msg, wparam, lparam);
+    }
+
+    return CallWindowProc(priv->origWndProc, window, msg, wparam, lparam);
+}
+
+HWND
+ALF_AddCheckbox(HWND parent, WORD id, int x, int y, const TCHAR *text)
+{
+    HWND hwnd  = CreateWindowEx(0,
+                                TEXT("BUTTON"),
+                                text,
+                                WS_CHILD | WS_VISIBLE | WS_TABSTOP | BS_AUTOCHECKBOX,
+                                0, 0, 100, 100,
+                                parent,
+                                (HMENU)(ULONG_PTR)id,
+                                ALF_HINSTANCE,
+                                NULL);
+
+    ALFCheckboxPriv *priv = ALF_Checkbox_InitializePriv();
+    SetWindowLongPtr(hwnd, GWLP_USERDATA, (LONG_PTR)priv);
+    priv->origWndProc = (WNDPROC)SetWindowLongPtr(hwnd, GWLP_WNDPROC, (LONG_PTR)ALF_Checkbox_WindowProc);
+
+    ALF_AddWidget(parent, x, y, hwnd, 0, 0, ALF_LAYOUT_SIZE_CHECKBOX | ALF_LAYOUT_INHERITFONT | ALF_LAYOUT_INHERITBGCOLOR | ALF_LAYOUT_SENDBGCHANGE);
+
+    return hwnd;
+}
-- 
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