From 03244d623ddb6104dd0c87487e5222d562632149 Mon Sep 17 00:00:00 2001
From: megacz <megacz@xwt.org>
Date: Fri, 30 Jan 2004 06:59:36 +0000
Subject: [PATCH] 2003/04/30 07:00:50

darcs-hash:20040130065936-2ba56-5ed47173d965c875d8609a2deafe7117a233c996.gz
---
 src/org/xwt/Box.java |   52 +++++++++++++++++++++++++++++++++++---------------
 1 file changed, 37 insertions(+), 15 deletions(-)

diff --git a/src/org/xwt/Box.java b/src/org/xwt/Box.java
index f0645aa..1e55cb8 100644
--- a/src/org/xwt/Box.java
+++ b/src/org/xwt/Box.java
@@ -189,8 +189,11 @@ public final class Box extends JSObject {
     /** If redirect is enabled, this holds the Box redirected to */
     Box redirect = this;
 
-    /** the Box's font -- you must call textupdate() after changing this */
-    String font = Platform.getDefaultFont();
+    /** the Box's font, null inherits from parent -- you must call textupdate() after changing this */
+    String font = null;
+
+    /** if font == null, this might be a cached copy of the inherited ancestor font */
+    String cachedFont = null;
 
     /** The surface for us to render on; null if none; INVARIANT: surface == getParent().surface */
     Surface surface = null;
@@ -373,16 +376,34 @@ public final class Box extends JSObject {
         set(dmin, 1, (image == null ? 0 : image.getHeight()) + (border == null ? 0 : border[0].getHeight()) * 2);
     }
 
+    /** returns the actual font that should be used to render this box */
+    private String font() {
+	if (font != null) return font;
+	if (font == null && cachedFont != null) return cachedFont;
+	if (getParent() != null) return cachedFont = getParent().font();
+	return cachedFont = Platform.getDefaultFont();
+    }
+
+    /** this must be called when a box's font changes */
+    void fontChanged() {
+	textupdate();
+	for(Box b = getChild(0); b != null; b = b.nextSibling())
+	    if (b.font == null) {
+		b.cachedFont = font();
+		b.fontChanged();
+	    }
+    }
+
     /** This must be called when font or text is changed */
     void textupdate() {
         if (text.equals("")) {
             set(textdim, 0, 0);
             set(textdim, 1, 0);
         } else {
-            XWF xwf = XWF.getXWF(font);
+            XWF xwf = XWF.getXWF(font());
             if (xwf == null) {
-                set(textdim, 0, Platform.stringWidth(font, text));
-                set(textdim, 1, (Platform.getMaxAscent(font) + Platform.getMaxDescent(font)));
+                set(textdim, 0, Platform.stringWidth(font(), text));
+                set(textdim, 1, (Platform.getMaxAscent(font()) + Platform.getMaxDescent(font())));
             } else {
                 set(textdim, 0, xwf.stringWidth(text));
                 set(textdim, 1, (xwf.getMaxAscent() + xwf.getMaxDescent()));
@@ -1014,34 +1035,34 @@ public final class Box extends JSObject {
         if ((textcolor & 0xFF000000) == 0x00000000) return;
         buf.setClip(x, y, w + x, h + y);
 
-        XWF xwf = XWF.getXWF(font);
+        XWF xwf = XWF.getXWF(font());
         if (xwf != null) {
             xwf.drawString(buf, text,
                            pos(0) + pad(0),
                            pos(1) + pad(1) + xwf.getMaxAscent() - 1,
                            textcolor);
         } else {
-            buf.drawString(font, text,
+            buf.drawString(font(), text,
                            pos(0) + pad(0),
-                           pos(1) + pad(1) + Platform.getMaxAscent(font) - 1,
+                           pos(1) + pad(1) + Platform.getMaxAscent(font()) - 1,
                            textcolor);
         }
 
         buf.setClip(0, 0, buf.getWidth(), buf.getHeight());
         
-        int i=0; while(i<font.length() && !Character.isDigit(font.charAt(i))) i++;
+        int i=0; while(i<font().length() && !Character.isDigit(font().charAt(i))) i++;
 
-        if (font.lastIndexOf('d') > i) {
+        if (font().lastIndexOf('d') > i) {
             for(int j = pos(0) + pad(0); j < pos(0) + pad(0) + textdim(0); j += 2)
-                buf.fillRect(j, pos(1) + pad(1) + (xwf == null ? Platform.getMaxAscent(font) : xwf.getMaxAscent()) + 2,
-                             j + 1, pos(1) + pad(1) + (xwf == null ? Platform.getMaxAscent(font) : xwf.getMaxAscent()) + 2 + 1,
+                buf.fillRect(j, pos(1) + pad(1) + (xwf == null ? Platform.getMaxAscent(font()) : xwf.getMaxAscent()) + 2,
+                             j + 1, pos(1) + pad(1) + (xwf == null ? Platform.getMaxAscent(font()) : xwf.getMaxAscent()) + 2 + 1,
                              textcolor);
 
-        } else if (font.lastIndexOf('u') > i) {
+        } else if (font().lastIndexOf('u') > i) {
             buf.fillRect(pos(0) + pad(0),
-                        pos(1) + pad(1) + (xwf == null ? Platform.getMaxAscent(font) : xwf.getMaxAscent()) + 2,
+                        pos(1) + pad(1) + (xwf == null ? Platform.getMaxAscent(font()) : xwf.getMaxAscent()) + 2,
                         pos(0) + pad(0) + textdim(0),
-                        pos(1) + pad(1) + (xwf == null ? Platform.getMaxAscent(font) : xwf.getMaxAscent()) + 2 + 1,
+                        pos(1) + pad(1) + (xwf == null ? Platform.getMaxAscent(font()) : xwf.getMaxAscent()) + 2 + 1,
                         textcolor);
         }
 
@@ -1316,6 +1337,7 @@ public final class Box extends JSObject {
     
     /** remove this node from its parent; INVARIANT: whenever the parent of a node is changed, remove() gets called. */
     public void remove() {
+	cachedFont = null;
         if (parent == null) {
             if (surface != null) surface.dispose(true);
             return;
-- 
1.7.10.4