From 51daba89072cb66fe5e43015484a554555a40499 Mon Sep 17 00:00:00 2001
From: Jonas Kümmerlin <jonas@kuemmerlin.eu>
Date: Thu, 23 Apr 2020 15:07:21 +0200
Subject: changed DPI handling: dpi is now pushed into every control and saved
 there

---
 alf/alfnotebook.cpp | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

(limited to 'alf/alfnotebook.cpp')

diff --git a/alf/alfnotebook.cpp b/alf/alfnotebook.cpp
index 501b072..6ffbe5d 100644
--- a/alf/alfnotebook.cpp
+++ b/alf/alfnotebook.cpp
@@ -17,6 +17,7 @@ typedef struct {
     HTHEME   hTheme;
     ALFColor themeTabBgColor;
     DWORD    flags;
+    int      dpi;
 } ALFNotebookPriv;
 
 typedef struct {
@@ -136,6 +137,16 @@ ALF_Notebook_PropagateFontToPages(HWND hwndNotebook, ALFNotebookPriv *priv, HFON
     }
 }
 
+static void
+ALF_Notebook_PropagateDpiChange(HWND hwndNotebook, ALFNotebookPriv *priv, WPARAM wparam, LPARAM lparam)
+{
+    int n = ALF_Notebook_InternalTabCount(hwndNotebook, priv->hwndTabCtrl);
+    for (int i = 0; i < n; ++i) {
+        HWND hwndPanel = ALF_NotebookTabPanel(hwndNotebook, i);
+        SendMessage(hwndPanel, ALF_WM_DPICHANGE, wparam, lparam);
+    }
+}
+
 static void
 ALF_Notebook_InternalHandleThemeChange(HWND hwndNotebook, ALFNotebookPriv *priv)
 {
@@ -172,6 +183,7 @@ ALF_Notebook_InternalAddTab(HWND notebook, ALFNotebookPriv *priv, const TCHAR *t
     SetWindowPos(hwndPanel, NULL, r.left, r.top, r.right - r.left, r.bottom - r.top, SWP_HIDEWINDOW|SWP_NOACTIVATE|SWP_NOZORDER|SWP_NOOWNERZORDER);
 
     SendMessage(hwndPanel, WM_SETFONT, (WPARAM)SendMessage(priv->hwndTabCtrl, WM_GETFONT, 0, 0), 0);
+    SendMessage(hwndPanel, ALF_WM_DPICHANGE, 0, (LPARAM)priv->dpi);
 
     ALF_Notebook_SetSingleTabBackground(notebook, priv, hwndPanel);
 
@@ -458,6 +470,10 @@ ALF__NotebookWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
         return (LRESULT)ALF_Notebook_GetWidgetFlags(hwnd, priv, (HWND)wParam);
     } else if (uMsg == ALF_WM_LYT_SETWDGTFLAGS) {
         return (LRESULT)ALF_Notebook_SetWidgetFlags(hwnd, priv, (HWND)wParam, (DWORD)lParam);
+    } else if (uMsg == ALF_WM_DPICHANGE) {
+        priv->dpi = (int)lParam;
+        ALF_Notebook_PropagateDpiChange(hwnd, priv, wParam, lParam);
+        return TRUE;
     }
 
     return DefWindowProc(hwnd, uMsg, wParam, lParam);
@@ -499,7 +515,7 @@ ALF_AddNotebook(HWND parent, WORD id, int x, int y)
                                     ALF_HINSTANCE,
                                     NULL);
 
-    ALF_AddWidget(parent, x, y, hwndNtbk, 0, 0, ALF_LAYOUT_SIZE_QUERY | ALF_LAYOUT_INHERITFONT);
+    ALF_AddWidget(parent, x, y, hwndNtbk, 0, 0, ALF_LAYOUT_SIZE_QUERY | ALF_LAYOUT_INHERITFONT | ALF_LAYOUT_SENDDPICHANGE);
 
     return hwndNtbk;
 }
-- 
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