Add support for changing the default row height in escalator (#12645)

Since this is quite the change, I've taken the opportunity to rewrite smaller
adjoining pieces to make more sense. Move methods from classes, and so on.
These changes are, however, only on the code level, no other functionality will
be introduced by this patch.

Change-Id: I56f19c5af7dc4ccfd2fa4c9098f06e77dbfa12fb

client/src/com/vaadin/client/ui/grid/RowContainer.java

      * @return the number of rows in the current row container
      */
     public int getRowCount();
+
+    /**
+     * The default height of the rows in this RowContainer.
+     * 
+     * @param px
+     *            the default height in pixels of the rows in this RowContainer
+     * @throws IllegalArgumentException
+     *             if <code>px &lt; 1</code>
+     */
+    public void setDefaultRowHeight(int px) throws IllegalArgumentException;
+
+    /**
+     * Returns the default height of the rows in this RowContainer.
+     * 
+     * @return the default height of the rows in this RowContainer, in pixels
+     */
+    public int getDefaultRowHeight();
 }

uitest/src/com/vaadin/tests/components/grid/BasicEscalator.java

                         grid.calculateColumnWidths();
                     }
                 }));
+
+        addComponent(new Button("Randomize row heights",
+                new Button.ClickListener() {
+                    @Override
+                    public void buttonClick(ClickEvent event) {
+                        grid.randomizeDefaultRowHeight();
+                    }
+                }));
     }
 
     @Override

uitest/src/com/vaadin/tests/widgetset/client/grid/TestGridClientRpc.java

     void setColumnWidth(int index, int px);
 
     void calculateColumnWidths();
+
+    void randomRowHeight();
 }

uitest/src/com/vaadin/tests/widgetset/client/grid/TestGridConnector.java

  */
 package com.vaadin.tests.widgetset.client.grid;
 
+import com.google.gwt.user.client.Random;
 import com.vaadin.client.ui.AbstractComponentConnector;
 import com.vaadin.shared.ui.Connect;
 import com.vaadin.shared.ui.grid.ScrollDestination;
             public void calculateColumnWidths() {
                 getWidget().calculateColumnWidths();
             }
+
+            @Override
+            public void randomRowHeight() {
+                getWidget().getHeader().setDefaultRowHeight(
+                        Random.nextInt(20) + 20);
+                getWidget().getBody().setDefaultRowHeight(
+                        Random.nextInt(20) + 20);
+                getWidget().getFooter().setDefaultRowHeight(
+                        Random.nextInt(20) + 20);
+            }
         });
     }
 

uitest/src/com/vaadin/tests/widgetset/client/grid/VTestGrid.java

         return escalator.getHeader();
     }
 
+    public RowContainer getBody() {
+        return escalator.getBody();
+    }
+
     public RowContainer getFooter() {
         return escalator.getFooter();
     }

uitest/src/com/vaadin/tests/widgetset/server/grid/TestGrid.java

     public void calculateColumnWidths() {
         rpc().calculateColumnWidths();
     }
+
+    public void randomizeDefaultRowHeight() {
+        rpc().randomRowHeight();
+    }
 }