From 5cbb664bd49cd2b9c035ccfc3024aa436d28c36c Mon Sep 17 00:00:00 2001
From: Jonas Kümmerlin <jonas@kuemmerlin.eu>
Date: Thu, 16 Apr 2020 13:12:32 +0200
Subject: layout: invalidate and recalculate, automatically

---
 alf/alflabel.cpp | 52 +++++++++++++++++++++++++++-------------------------
 1 file changed, 27 insertions(+), 25 deletions(-)

(limited to 'alf/alflabel.cpp')

diff --git a/alf/alflabel.cpp b/alf/alflabel.cpp
index fd2cab7..f400f4f 100644
--- a/alf/alflabel.cpp
+++ b/alf/alflabel.cpp
@@ -69,6 +69,7 @@ ALF__LabelWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
         return TRUE;
     } else if (uMsg == WM_SETTEXT) {
         InvalidateRect(hwnd, NULL, TRUE);
+        ALF_InvalidateLayout(GetParent(hwnd));
     } else if (uMsg == WM_GETDLGCODE) {
         return DLGC_STATIC;
     } else if (uMsg == WM_SETFONT) {
@@ -76,6 +77,8 @@ ALF__LabelWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
         if (LOWORD(lParam) != 0)
             InvalidateRect(hwnd, NULL, TRUE);
 
+        ALF_InvalidateLayout(GetParent(hwnd));
+
         return 0;
     } else if (uMsg == WM_GETFONT) {
         return (LRESULT)priv->font;
@@ -167,40 +170,39 @@ ALF__LabelWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 
         return TRUE;
     } else if (uMsg == ALF_WM_QUERYSIZE) {
-        HDC hdcLabel = GetDC(hwnd);
-        HFONT oldFont = 0;
-        if (priv->font)
-            oldFont = SelectFont(hdcLabel, priv->font);
+        int textlen = GetWindowTextLength(hwnd);
+        SIZE *pSize = (SIZE*)(void*)lParam;
+        if (textlen) {
+            HDC hdcLabel = GetDC(hwnd);
+            HFONT oldFont = SelectFont(hdcLabel, priv->font);
 
-        // calc drawtext style
-        UINT format = DT_LEFT | DT_EXPANDTABS | DT_CALCRECT;
+            // calc drawtext style
+            UINT format = DT_LEFT | DT_EXPANDTABS | DT_CALCRECT;
 
-        RECT r = { 0, 0, 100, 100 };
+            RECT r = { 0, 0, 100, 100 };
 
-        int textlen = GetWindowTextLength(hwnd);
-        TCHAR *textbuf = ALF_New(TCHAR, textlen + 1);
-        GetWindowText(hwnd, textbuf, textlen+1);
+            TCHAR *textbuf = ALF_New(TCHAR, textlen + 1);
+            GetWindowText(hwnd, textbuf, textlen+1);
 
-        DrawText(hdcLabel, textbuf, -1, &r, format);
+            DrawText(hdcLabel, textbuf, -1, &r, format);
 
-        ALF_Free(textbuf);
+            ALF_Free(textbuf);
 
-        SIZE *pSize = (SIZE*)(void*)lParam;
-        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);
-        }
-        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);
-        }
+            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);
+            }
+            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);
+            }
 
-        if (oldFont)
             SelectFont(hdcLabel, oldFont);
 
-        ReleaseDC(hwnd, hdcLabel);
+            ReleaseDC(hwnd, hdcLabel);
+        }
     } else if (uMsg == WM_DESTROY) {
         ALF_Free(priv);
         SetWindowLongPtr(hwnd, 0, 0);
-- 
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