From 550305c15fce921bf2dc58fcd38c5b63e8c60d71 Mon Sep 17 00:00:00 2001
From: "ho.namkoong" <ho.namkoong@samsung.com>
Date: Mon, 10 Dec 2012 01:47:40 +0900
Subject: [PATCH] [Title] implement makeChildBackgroundTransient method [Type]
 [Module] [Priority] [Jira#] [Redmine#] 7625 [Problem] [Cause] [Solution]
 [TestCase]

Change-Id: I40eb49f4cc105a5c371adf19ffe90bc3ea21c916
---
 .../src/org/tizen/common/util/SWTUtil.java         | 73 ++++++++++++++++++++++
 1 file changed, 73 insertions(+)

diff --git a/org.tizen.common/src/org/tizen/common/util/SWTUtil.java b/org.tizen.common/src/org/tizen/common/util/SWTUtil.java
index 6da335f..4e2f9bb 100755
--- a/org.tizen.common/src/org/tizen/common/util/SWTUtil.java
+++ b/org.tizen.common/src/org/tizen/common/util/SWTUtil.java
@@ -35,6 +35,7 @@ import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Stack;
+import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -50,8 +51,13 @@ import org.eclipse.jface.layout.PixelConverter;
 import org.eclipse.jface.resource.JFaceResources;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.ScrolledComposite;
+import org.eclipse.swt.events.PaintEvent;
+import org.eclipse.swt.events.PaintListener;
 import org.eclipse.swt.events.VerifyEvent;
 import org.eclipse.swt.events.VerifyListener;
+import org.eclipse.swt.graphics.GC;
+import org.eclipse.swt.graphics.Image;
+import org.eclipse.swt.graphics.Point;
 import org.eclipse.swt.graphics.Resource;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
@@ -567,5 +573,72 @@ public class SWTUtil {
         int widthHint= converter.convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH);
         return Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x);
     }
+    
+    /**
+     * make background image of child control transient.
+     * Actually, it just copy parent image and paint it to the child background.
+     * Also, it works only when background of parent is image
+     * 
+     * @param parent parent composite
+     * @param child child control
+     */
+    public static void makeChildBackgroundTransient(final Composite parent) {
+        if(parent != null) {
+            final Object lock = new Object();
+            final AtomicBoolean finished = new AtomicBoolean(false);
+            parent.addPaintListener(new PaintListener() {
+                
+                class PairControl {
+                    
+                    PairControl(Composite parent, Control child) {
+                        this.parent = parent;
+                        this.child = child;
+                    }
+                    Composite parent;
+                    Control child;
+                }
+                
+                @Override
+                public void paintControl(PaintEvent e) {
+                    if(finished.get()) {
+                        return;
+                    }
+                    synchronized (lock) {
+                        finished.set(true);
+                        parent.removePaintListener(this);
+                        if(parent.getBackgroundImage() != null) {
+                            
+                            Stack<PairControl> childStack = new Stack<PairControl>();
+                            
+                            for(Control childControl: parent.getChildren()) {
+                                childStack.add(new PairControl(parent, childControl));
+                            }
+                            
+                            while(!childStack.isEmpty()) {
+                                PairControl pair = childStack.pop();
+                                Control childControl = pair.child;
+                                Composite parentComposite = pair.parent;
+                                Image parentImage = parentComposite.getBackgroundImage();
+                                Point childLoc = childControl.getLocation();
+                                
+                                if(childControl instanceof Composite) {
+                                    Composite childComposite = ((Composite)childControl);
+                                    for(Control grandChildControl: childComposite.getChildren()) {
+                                        childStack.push(new PairControl(childComposite, grandChildControl));
+                                    }
+                                }
+                                Point childSize = childControl.getSize();
+                                Image childImage = new Image(SWTUtil.getDisplay(), childSize.x, childSize.y);
+                                GC gc = new GC(parentImage);
+                                gc.copyArea(childImage, childLoc.x, childLoc.y);
+                                gc.dispose();
+                                childControl.setBackgroundImage(childImage);
+                            }
+                        }
+                    }
+                }
+            });
+        }
+    }
 
 }
-- 
2.7.4