Creating Composite Widgets using GWT

Creating Composite Widgets using GWT

Creating Composite Widgets using GWT

Creating Composite Widgets using GWT

     

This example describes the Basics for creating composite widgets using GWT. The steps involved in Building the Composite widgets are described below:-

final Label label = new Label("Click the Node to view Tree structure")
Here we are declaring label. Label is a widget that contains text.

private TextBox tb = new TextBox();
Declaring a new TextBox as tb.

private CheckBox cb = new CheckBox();
Declaring a new CheckBox as cb.

VerticalPanel panel = new VerticalPanel()
Creating a Vertical panel named as panel.

panel.add(cb)
This is the method of the panel class for adding checkbox to the panel.

RootPanel.get().add(label1)
By this method we are adding label to the rootpanel.Root panel is a panel to which all other widgets must  be added. it is not created directly.

Compositewidgetex.java

package org.yournamehere.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.CheckBox;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

public class Compositewidgetex implements EntryPoint{
private static class OptionalTextBox extends Composite 
  implements ClickListener {
   private TextBox tb = new TextBox();
  private CheckBox cb = new CheckBox();

  public OptionalTextBox(String caption) {

  VerticalPanel panel = new VerticalPanel();
  panel.add(cb);
  panel.add(tb);

  cb.setText(caption);
  cb.setChecked(true);
  cb.addClickListener(this);
  initWidget(panel);
  }

  public void onClick(Widget sender) {
  if (sender == cb) {
  tb.setEnabled(cb.isChecked());
  }
  }
  public void setCaption(String caption) {
  cb.setText(caption);
  }
  public String getCaption() {
  return cb.getText();
  }
  }

  public void onModuleLoad() {
 final Label label = new
   Label("Example to show Composite widgets");
  final Label label1 = new 
  Label("   ");
  OptionalTextBox optionalTextBox = 
   new OptionalTextBox("Check this to enable");
  RootPanel.get().add(label);
  RootPanel.get().add(label1);
  RootPanel.get().add(optionalTextBox);
  
  }
}

Main.gwt.xml

<?xml version="1.0" encoding="UTF-8"?>
<module>
  <inherits name="com.google.gwt.user.User"/>
  <entry-point 
class="org.yournamehere.client.Compositewidgetex"/>
  
</module>

Output of the program :

   

Download sourcecode

     

Tutorials

  1. Calendar Example
  2. Draw Calendar in SWT
  3. SWT TextEditor
  4. Show different types of Cursor
  5. How to create Combo Box in SWT
  6. Temperature Converter in SWT
  7. Rotate Text in Java
  8. Tree Example
  9. Create Tree in SWT
  10. SWT Spinner
  11. Create Scale in SWT
  12. Create Radio Buttons in SWT
  13. Create Progress Bar in SWT
  14. Create Menu Bar in SWT
  15. Create Popup List in SWT
  16. Login Form in SWT
  17. How to create Link in SWT
  18. Use Group Class in SWT
  19. Draw a Flowchart
  20. Drag and Drop Example in SWT
  21. Show Font Dialog and Color Dialog
  22. Creating List in Java using SWT
  23. Create Scroll Bar in Java using SWT
  24. Create ToolTip Text in SWT
  25. Create Tabs in Java using SWT
  26. SWT Browser
  27. Create Expand Bar in SWT
  28. SWT File Browser
  29. Use of ColorRegistry and FontRegistry
  30. Create a Sash in SWT
  31. Create a Sash Form
  32. Demonstrates TableTree
  33. Create a ToolBar
  34. Use of PreferenceStore class
  35. SWT
  36. Demonstrates Wizard
  37. Create Table in SWT
  38. SWT
  39. StyledText in SWT
  40. Creating Composite Widgets using GWT