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/alflabel.cpp | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

(limited to 'alf/alflabel.cpp')

diff --git a/alf/alflabel.cpp b/alf/alflabel.cpp
index 37f1e83..13c86ae 100644
--- a/alf/alflabel.cpp
+++ b/alf/alflabel.cpp
@@ -7,27 +7,32 @@ typedef struct {
     HFONT    font;
     ALFColor bgcolor;
     ALFColor textcolor;
+    int      dpi;
 } ALFLabelPriv;
 
 TCHAR *_alf_labelClass;
 
 static int
-ALF__LabelTopPadding(HWND hwnd)
+ALF__LabelTopPadding(HWND hwnd, ALFLabelPriv *priv)
 {
+    (void)hwnd;
+
     // some pixels on top to align with the edit control
     // see also: alfedit.cpp
     return ALF_Compat_GetSystemMetricsForDpi(
-                SM_CYEDGE, (UINT)ALF_CentipointsToPixels(GetParent(hwnd), 7200))
+                SM_CYEDGE, (UINT)priv->dpi)
             + (!ALF_Compat_IsMinWindowsVersion(4, 0) ? 2 : 1) /* internal padding in edit control */;
 }
 
 static int
-ALF__LabelLeftPadding(HWND hwnd, HDC hdc)
+ALF__LabelLeftPadding(HWND hwnd, HDC hdc, ALFLabelPriv *priv)
 {
+    (void)hwnd;
+
     // some pixels on the left to align with the edit control
     // see also: alfedit.cpp
     int p = ALF_Compat_GetSystemMetricsForDpi(
-                SM_CXEDGE, (UINT)ALF_CentipointsToPixels(GetParent(hwnd), 7200));
+                SM_CXEDGE, (UINT)priv->dpi);
 
     p += 1;
 
@@ -98,9 +103,9 @@ ALF_Label_Paint(HWND hwnd, ALFLabelPriv *priv, HDC hdc, RECT *r)
     }
 
     if ((priv->style & ALF_LABEL_HALIGN_MASK) == ALF_LABEL_ALIGN_LEFT_LIKE_EDIT)
-        rc.left += ALF__LabelLeftPadding(hwnd, hdc);
+        rc.left += ALF__LabelLeftPadding(hwnd, hdc, priv);
     if ((priv->style & ALF_LABEL_VALIGN_MASK) == ALF_LABEL_ALIGN_TOP_LIKE_EDIT)
-        rc.top += ALF__LabelTopPadding(hwnd);
+        rc.top += ALF__LabelTopPadding(hwnd, priv);
 
     TCHAR *text = ALF_Text(hwnd);
 
@@ -160,12 +165,12 @@ ALF_Label_CalculateSize(HWND hwnd, ALFLabelPriv *priv, SIZE *pSize)
         if (pSize->cx == 0) {
             pSize->cx = r.right - r.left;
             if ((priv->style & ALF_LABEL_HALIGN_MASK) == ALF_LABEL_ALIGN_LEFT_LIKE_EDIT)
-                pSize->cx += ALF__LabelLeftPadding(hwnd, hdcLabel);
+                pSize->cx += ALF__LabelLeftPadding(hwnd, hdcLabel, priv);
         }
         if (pSize->cy == 0) {
             pSize->cy = r.bottom - r.top;
             if ((priv->style & ALF_LABEL_VALIGN_MASK) == ALF_LABEL_ALIGN_TOP_LIKE_EDIT)
-                pSize->cy += ALF__LabelTopPadding(hwnd);
+                pSize->cy += ALF__LabelTopPadding(hwnd, priv);
         }
 
         SelectFont(hdcLabel, oldFont);
@@ -275,6 +280,10 @@ ALF__LabelWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
         return TRUE;
     } else if (uMsg == ALF_WM_GETTEXTCOLOR) {
         return (LRESULT)priv->textcolor;
+    } else if (uMsg == ALF_WM_DPICHANGE) {
+        priv->dpi = (int)lParam;
+        ALF_InvalidateLayout(GetParent(hwnd));
+        return TRUE;
     } else if (uMsg == WM_DESTROY) {
         ALF_Free(priv);
         SetWindowLongPtr(hwnd, 0, 0);
@@ -299,9 +308,10 @@ ALF_AddLabel(HWND win, WORD id, int x, int y, const TCHAR *text)
     priv->style = ALF_LABEL_ALIGN_LEFT | ALF_LABEL_ALIGN_TOP_LIKE_EDIT;
     priv->bgcolor = ALF_COLOR_SYS(COLOR_BTNFACE);
     priv->textcolor = ALF_COLOR_SYS(COLOR_BTNTEXT);
+    priv->dpi = 96;
     SetWindowLongPtr(hwndLabel, 0, (LONG_PTR)priv);
 
-    ALF_AddWidget(win, x, y, hwndLabel, 0, 0, ALF_LAYOUT_SIZE_QUERY | ALF_LAYOUT_INHERITFONT | ALF_LAYOUT_INHERITBGCOLOR | ALF_LAYOUT_SENDBGCHANGE);
+    ALF_AddWidget(win, x, y, hwndLabel, 0, 0, ALF_LAYOUT_SIZE_QUERY | ALF_LAYOUT_INHERITFONT | ALF_LAYOUT_INHERITBGCOLOR | ALF_LAYOUT_SENDBGCHANGE | ALF_LAYOUT_SENDDPICHANGE);
 
     return hwndLabel;
 }
-- 
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