com.google.gwt.user.client.ui
Class SplitLayoutPanel

java.lang.Object
  com.google.gwt.user.client.ui.UIObject
      com.google.gwt.user.client.ui.Widget
          com.google.gwt.user.client.ui.Panel
              com.google.gwt.user.client.ui.ComplexPanel
                  com.google.gwt.user.client.ui.DockLayoutPanel
                      com.google.gwt.user.client.ui.SplitLayoutPanel

All Implemented Interfaces:

HasAttachHandlers, HasHandlers, EventListener, AnimatedLayout, HasWidgets, HasWidgets.ForIsWidget, IndexedPanel, IndexedPanel.ForIsWidget, IsWidget, ProvidesResize, RequiresResize, java.lang.Iterable<Widget>

public class SplitLayoutPanel
extends DockLayoutPanel

A panel that adds user-positioned splitters between each of its child widgets.

This panel is used in the same way as DockLayoutPanel, except that its children's sizes are always specified in Style.Unit.PX units, and each pair of child widgets has a splitter between them that the user can drag.

This widget will only work in standards mode, which requires that the HTML page in which it is run have an explicit <!DOCTYPE> declaration.

CSS Style Rules

• .gwt-SplitLayoutPanel { the panel itself }
• .gwt-SplitLayoutPanel .gwt-SplitLayoutPanel-HDragger { horizontal dragger }
• .gwt-SplitLayoutPanel .gwt-SplitLayoutPanel-VDragger { vertical dragger }

Example

public class SplitLayoutPanelExample implements EntryPoint {

  public void onModuleLoad() {
    // Create a three-pane layout with splitters. 
    SplitLayoutPanel p = new SplitLayoutPanel();
    p.addWest(new HTML("navigation"), 128);
    p.addNorth(new HTML("list"), 384);
    p.add(new HTML("details"));

    // Attach the LayoutPanel to the RootLayoutPanel. The latter will listen for
    // resize events on the window to ensure that its children are informed of
    // possible size changes.
    RootLayoutPanel rp = RootLayoutPanel.get();
    rp.add(p);
  }
}

SplitLayoutPanel

public SplitLayoutPanel()

Construct a new SplitLayoutPanel with the default splitter size of 8px.

SplitLayoutPanel

public SplitLayoutPanel(int splitterSize)

Construct a new SplitLayoutPanel with the specified splitter size in pixels.

Parameters:

splitterSize - the size of the splitter in pixels

getSplitterSize

public int getSplitterSize()

Return the size of the splitter in pixels.

Returns:

the splitter size

insert

public void insert(Widget child,
                   DockLayoutPanel.Direction direction,
                   double size,
                   Widget before)

Description copied from class: DockLayoutPanel

Adds a widget to the specified edge of the dock. If the widget is already a child of this panel, this method behaves as though DockLayoutPanel.remove(Widget) had already been called.

Overrides:

insert in class DockLayoutPanel

Parameters:

child - the widget to be added

direction - the widget's direction in the dock

before - the widget before which to insert the new child, or null to append

remove

public boolean remove(Widget child)

Description copied from class: Panel

Removes a child widget.

How to Override this Method

There are several important things that must take place in the correct order to properly remove a Widget from a Panel. Not all of these steps will be relevant to every Panel, but all of the steps must be considered.

1. Validate: Make sure this Panel is actually the parent of the child Widget; return false if it is not.
2. Orphan: Call Panel.orphan(Widget) first while the child Widget is still attached.
3. Physical Detach: Adjust the DOM to account for the removal of the child Widget. The Widget's Element must be physically removed from the DOM.
4. Logical Detach: Update the Panel's state variables to reflect the removal of the child Widget. Example: the Widget is removed from the Panel's WidgetCollection.

Specified by:

remove in interface HasWidgets

Overrides:

remove in class DockLayoutPanel

Parameters:

child - the widget to be removed

Returns:

true if the child was present

setWidgetMinSize

public void setWidgetMinSize(Widget child,
                             int minSize)

Sets the minimum allowable size for the given widget.

Its associated splitter cannot be dragged to a position that would make it smaller than this size. This method has no effect for the DockLayoutPanel.Direction.CENTER widget.

Parameters:

child - the child whose minimum size will be set

minSize - the minimum size for this widget