[gwt-contrib] Adding a method to DockLayoutPanel to get the size of a child widget. (issue1705803)

[jlabanca]

Reviewers: rdayal,

Description:
Adding a method to DockLayoutPanel to get the size of a child widget.
Issue: 4613
Author: tuckerpmt
Reviewer: jlabanca


Please review this at http://gwt-code-reviews.appspot.com/1705803/

Affected files:
  M user/src/com/google/gwt/user/client/ui/DockLayoutPanel.java
  M user/test/com/google/gwt/user/client/ui/DockLayoutPanelTest.java


Index: user/src/com/google/gwt/user/client/ui/DockLayoutPanel.java
===================================================================
--- user/src/com/google/gwt/user/client/ui/DockLayoutPanel.java	(revision  
10965)
+++ user/src/com/google/gwt/user/client/ui/DockLayoutPanel.java	(working  
copy)
@@ -283,6 +283,7 @@
    * @param child the widget to be queried
    * @return the widget's layout direction, or <code>null</code> if it is  
not a
    *         child of this panel
+   * @throws AssertionError if the widget is not a child and assertions  
are enabled
    */
   public Direction getWidgetDirection(Widget child) {
     assertIsChild(child);
@@ -290,6 +291,22 @@
       return null;
     }
     return ((LayoutData) child.getLayoutData()).direction;
+  }
+
+  /**
+   * Gets the layout size of the given child widget.
+   *
+   * @param child the widget to be queried
+   * @return the widget's layout size, or <code>null</code> if it is not a  
child of
+   *         this panel
+   * @throws AssertionError if the widget is not a child and assertions  
are enabled
+   */
+  public Double getWidgetSize(Widget child) {
+    assertIsChild(child);
+    if (child.getParent() != this) {
+      return null;
+    }
+    return ((LayoutData) child.getLayoutData()).size;
   }

   /**
Index: user/test/com/google/gwt/user/client/ui/DockLayoutPanelTest.java
===================================================================
--- user/test/com/google/gwt/user/client/ui/DockLayoutPanelTest.java	 
(revision 10965)
+++ user/test/com/google/gwt/user/client/ui/DockLayoutPanelTest.java	 
(working copy)
@@ -160,6 +160,13 @@
     assertPhysicalPaternity(panel, widget);
   }

+  public void testGetWidgetSize() {
+    DockLayoutPanel panel = createDockLayoutPanel();
+    Widget widget = new Label();
+    panel.addEast(widget, 123.4);
+    assertEquals(123.4, panel.getWidgetSize(widget), 0.1);
+  }
+
   public void testInsertLineEnd() {
     DockLayoutPanel panel = createDockLayoutPanel();
     Widget widget = new Label();


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