Having understood this constraint, this article describes placing extension wrappers around SmartGWT canvas widgets to allow them to be used as UIBinder widgets. Also note that certain newer SmartGWT widgets do not work well with UIBinder.
As described in a previous article, any GWT to be used as UIBinder widgets should
be
- an extension class of com.google.gwt.user.client.ui.Widget and
- implement com.google.gwt.user.client.ui.HasWidgets.
The first SmartGWT widget to extend is, of course, com.smartgwt.client.widgets.Canvas, because all SmartGWT has to be placed onto a Canvas.
Notice the HasWidgetsUtil import highlighted in crimson. HasWidgetsUtil contains common static methods which could be used in most wrappers.import org.synthful.smartgwt.client.HasWidgetsUtil;import com.google.gwt.user.client.ui.HasWidgets;
import com.google.gwt.user.client.ui.Widget;
import com.smartgwt.client.widgets.Canvas;
public class UICanvas
extends Canvas
implements HasWidgets
{
@Override
public void add(Widget w) {
super.addChild(w);
}
@Override
public Iterator<Widget> iterator() {
return HasWidgetsUtil.iterator(this);
}
@Override
public boolean remove(Widget w) {
return HasWidgetsUtil.remove(this, w);
}
}
For a Canvas object that does not inherit from com.google.gwt.user.client.ui.Widget, we need to wrap it with a class that extends Widget and expose all the methods of that Canvas object. For example, while com.smartgwt.client.widgets.tab.TabSet inherits Widget, com.smartgwt.client.widgets.tab.Tab does not.
Wrapping Tabset is as simple as wrapping Canvas:
public class UITabsetHowever, to be able to use UIBinder to assign a Tab as a child of a Tabset, we need to wrap the Tab class this way:
extends TabSet
implements HasWidgets
{
@Override
public void add(Widget w){
if (w instanceof UITab)
super.addTab(((UITab)w).tab);
else
super.addChild(w);
}
@Override
public Iterator<Widget> iterator(){
return HasWidgetsUtil.iterator(this);
}
@Override
public boolean remove(Widget w){
return HasWidgetsUtil.remove(this, w);
}
}
package holymoly.smartgwt.ui
import java.util.ArrayList;
import java.util.Iterator;
import org.synthful.smartgwt.client.HasWidgetsUtil;
import com.google.gwt.user.client.ui.HasWidgets;
import com.google.gwt.user.client.ui.Widget;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.tab.Tab;
public class UITab
extends Widget
implements HasWidgets
{
public UITab(){
this.tab = new Tab();
}
public void add(Canvas w){
if (this.canvas==null){
this.canvas = (Canvas)w;
tab.setPane(this.canvas);
}
}
@Override
public void add(Widget w){
try{
this.add((Canvas)w);
}
catch(Exception e){}
}
@Override
public void clear() {
}
@Override
public Iteratoriterator() {
ArrayList<Widget> wx = new ArrayList();
wx.add(this.canvas);
return wx.iterator();
}
@Override
public boolean remove(Widget w){
return HasWidgetsUtil.remove(this, w);
}
public void setCloseable(boolean closeable){
this.tab.setCanClose(closeable);
}
public void setCloseIcon(String closeIcon){
this.tab.setCloseIcon(closeIcon);
}
public void setCloseIconSize(String closeIconSize){
try{
int z = Integer.parseInt(closeIconSize);
this.tab.setCloseIconSize(z);
}
catch (Exception e){}
}
public void setDisabled(boolean disabled){
this.tab.setDisabled(disabled);
}
public void setTitle(String title){
this.tab.setTitle(title);
}
public void setWidth(String width){
try{
int z = Integer.parseInt(width);
this.tab.setWidth(z);
}
catch (Exception e){}
}
final protected Tab tab;
private Canvas canvas;
}
Now we could comfortably use these SmartGWT widgets with UIBinder:
<ui:uibinder
xmlns:ui="urn:ui:com.google.gwt.uibinder"
xmlns:z="urn:import:holymoly.smartgwt.ui"
xmlns:g="urn:import:com.google.gwt.user.client.ui">
<z:UICanvas ui:field="canvas">
<z:UITabset ui:field="tabset">
<z:UITab ui:field="tab1"> closeable="true"
closeIcon="{someResource.someicon}"
<g:Label ui:field="tab1content">
Hello Galaticals!
</g:Label>
</z:UITab>
</z:UITabset>
</z:UICanvas>
</ui:uibinder>
More examples are found at
http://code.google.com/p/synthfuljava/source/browse/#svn/trunk/gwt/smartgwt.
This is solid gold. Thanks!
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