From d607540dbaf8a0b2a24dceb27ebddddb420ffd0f Mon Sep 17 00:00:00 2001
From: Jonas Kümmerlin <jonas@kuemmerlin.eu>
Date: Sat, 6 Jun 2020 11:32:19 +0200
Subject: redintroduce update fonts vfunc, hopefully more useful now

---
 alf/alftoplevel.cpp | 57 +++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 42 insertions(+), 15 deletions(-)

(limited to 'alf/alftoplevel.cpp')

diff --git a/alf/alftoplevel.cpp b/alf/alftoplevel.cpp
index 2d2f52d..e2d2f64 100644
--- a/alf/alftoplevel.cpp
+++ b/alf/alftoplevel.cpp
@@ -1,6 +1,7 @@
 #include "alfpriv.h"
 
 #define ALF_TOPLEVEL_FLAG_MODALEND      ((DWORD)1)
+#define ALF_TOPLEVEL_FLAG_OWNS_HFONT    ((DWORD)2)
 
 typedef struct {
     HWND                hwnd;
@@ -13,7 +14,6 @@ typedef struct {
     LPARAM              modalResult;
     ALFLayout           layout;
     HWND                hwndFocus;
-    HFONT               hMessageFont;
 } ALFToplevelPriv;
 
 struct tagALFApplication {
@@ -49,17 +49,19 @@ ALF_DestroyToplevelPriv(ALFToplevelPriv *priv)
     if (priv->app && priv->app->activeToplevel == priv)
         priv->app->activeToplevel = NULL;
 
+    if (priv->flags & ALF_TOPLEVEL_FLAG_OWNS_HFONT) {
+        DeleteFont(priv->layout.font);
+        priv->layout.font = NULL;
+    }
+
     ALF_ListRemove(&priv->toplevelList);
     ALF_Layout_Clear(&priv->layout);
 
-    if (priv->hMessageFont)
-        DeleteObject(priv->hMessageFont);
-
     ALF_Free(priv);
 }
 
 static void
-ALF_UpdateFontsPriv(HWND win, ALFToplevelPriv *priv)
+ALF_Toplevel_SetDefaultFontPriv(HWND win, ALFToplevelPriv *priv)
 {
     // XXX: SystemParametersInfoForDpi is Unicode-only and needs Vista+ NONCLIENTMETRICS,
     ALF_NONCLIENTMETRICSW_VISTA ncm;
@@ -83,13 +85,20 @@ ALF_UpdateFontsPriv(HWND win, ALFToplevelPriv *priv)
         lstrcpy(lfMessageFont.lfFaceName, TEXT("MS Shell Dlg"));
     }
 
-    if (priv->hMessageFont) {
-        DeleteObject(priv->hMessageFont);
-    }
+    HFONT hMessageFont = CreateFontIndirect(&lfMessageFont);
 
-    priv->hMessageFont = CreateFontIndirect(&lfMessageFont);
+    SendMessage(win, WM_SETFONT, (WPARAM)hMessageFont, (LPARAM)1);
+    priv->flags |= ALF_TOPLEVEL_FLAG_OWNS_HFONT;
+}
 
-    SendMessage(win, WM_SETFONT, (WPARAM)priv->hMessageFont, (LPARAM)1);
+static void
+ALF_Toplevel_HandleDpiOrSettingsChange(HWND hwnd, ALFToplevelPriv *priv)
+{
+    if (priv->vtbl && priv->vtbl->updatefontsdpi) {
+        priv->vtbl->updatefontsdpi(priv->closure, hwnd);
+    } else {
+        ALF_Toplevel_SetDefaultFontPriv(hwnd, priv);
+    }
 }
 
 
@@ -218,11 +227,22 @@ ALF_Toplevel_DefWindowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
         return (LRESULT)priv->layout.dpi;
     }
 
-    if (msg == ALF_WM_UPDATEFONTS) {
-        ALF_UpdateFontsPriv(hwnd, priv);
+    if (msg == ALF_WM_TPLVL_SETDEFFONT) {
+        ALF_Toplevel_SetDefaultFontPriv(hwnd, priv);
         return 0;
     }
 
+    if (msg == WM_SETFONT) {
+        // we might need to clean up the existing font
+        if (priv->flags & ALF_TOPLEVEL_FLAG_OWNS_HFONT) {
+            DeleteFont(priv->layout.font);
+            priv->layout.font = NULL;
+            priv->flags &= ~ALF_TOPLEVEL_FLAG_OWNS_HFONT;
+        }
+
+        // fallthrough to layout which sets the new font
+    }
+
     if (msg == WM_ACTIVATE) {
         if (wparam) {
             if (priv->app) {
@@ -378,8 +398,8 @@ ALF_Toplevel_DefWindowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
     }
 
     if (msg == WM_THEMECHANGED || msg == WM_SETTINGCHANGE) {
-        ALF_UpdateFontsPriv(hwnd, priv);
-        ALF_Layout_Invalidate(&priv->layout, hwnd);
+        ALF_Toplevel_HandleDpiOrSettingsChange(hwnd, priv);
+        ALF_InvalidateLayout(hwnd);
         ALF_InvalidateBackground(hwnd);
         InvalidateRect(hwnd, NULL, TRUE);
     }
@@ -402,7 +422,7 @@ ALF_Toplevel_DefWindowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
         }
 
         if (msg == ALF_WM_DPICHANGE) {
-            ALF_UpdateFontsPriv(hwnd, priv);
+            ALF_Toplevel_HandleDpiOrSettingsChange(hwnd, priv);
         }
 
         return ret;
@@ -580,6 +600,13 @@ ALF_Toplevel_Application(HWND toplevel)
     return (ALFApplication *)SendMessage(toplevel, ALF_WM_GETAPPLICATION, 0, 0);
 }
 
+
+void
+ALF_Toplevel_SetDefaultFont(HWND toplevel)
+{
+    SendMessage(toplevel, ALF_WM_TPLVL_SETDEFFONT, 0, 0);
+}
+
 ALFApplication *
 ALF_CreateApplication(void)
 {
-- 
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