Added custom Maker for page-height and page-width; use fallback values in case value is auto

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@291338 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 70 insertions, 0 deletions

diff --git a/src/java/org/apache/fop/fo/properties/PageDimensionMaker.java b/src/java/org/apache/fop/fo/properties/PageDimensionMaker.java
new file mode 100644
index 000000000..cf50fc41f
--- /dev/null
+++ b/src/java/org/apache/fop/fo/properties/PageDimensionMaker.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2005 The Apache Software Foundation.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* $Id$ */
+
+package org.apache.fop.fo.properties;
+
+import org.apache.fop.fo.Constants;
+import org.apache.fop.fo.FObj;
+import org.apache.fop.fo.PropertyList;
+import org.apache.fop.fo.expr.PropertyException;
+import org.apache.fop.fo.properties.LengthProperty;
+
+/**
+ * Custom Maker for page-height / page-width
+ * 
+ */
+public class PageDimensionMaker extends LengthProperty.Maker {
+    
+    /**
+     * Constructor
+     * 
+     * @param propId    the property Id
+     */
+    public PageDimensionMaker(int propId) {
+        super(propId);
+    }
+    
+    /**
+     * Check the value of the page-width / page-height property. 
+     * Return the default or user-defined fallback in case the value
+     * was specified as "auto"
+     * 
+     * @see org.apache.fop.fo.properties.PropertyMaker#get(int, PropertyList, boolean, boolean)
+     */
+    public Property get(int subpropId, PropertyList propertyList,
+                        boolean tryInherit, boolean tryDefault) 
+            throws PropertyException {
+        
+        Property p = super.get(0, propertyList, tryInherit, tryDefault);    
+        
+        //TODO: add check for both height and width being specified as indefinite
+        //      and use the fallback value (= set to "auto")
+        
+        if (p.isAuto()) {
+            FObj fo = propertyList.getFObj();
+            
+            String fallbackValue = (propId == Constants.PR_PAGE_HEIGHT)
+                ? fo.getFOEventHandler().getUserAgent().getPageHeight()
+                    : fo.getFOEventHandler().getUserAgent().getPageWidth();
+            return make(propertyList, fallbackValue, fo);
+        }
+        
+        return p;
+    }
+    
+}