Eclipse RAP Development Guide (Galileo) - ControlEditor (Eclipse Rich Ajax Platform API Specification)

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Eclipse Rich Ajax Platform
Release 1.2

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org.eclipse.swt.custom
Class ControlEditor


java.lang.Object
  
org.eclipse.swt.custom.ControlEditor

Direct Known Subclasses:: TableEditor, TreeEditor

public class ControlEditor
extends Object

A ControlEditor is a manager for a Control that appears above a composite and tracks with the moving and resizing of that composite. It can be used to display one control above another control. This could be used when editing a control that does not have editing capabilities by using a text editor or for launching a dialog by placing a button above a control.

Here is an example of using a ControlEditor:

 Canvas canvas = new Canvas(shell, SWT.BORDER);
 canvas.setBounds(10, 10, 300, 300);	
 Color color = new Color(null, 255, 0, 0);
 canvas.setBackground(color);
 ControlEditor editor = new ControlEditor (canvas);
 // The editor will be a button in the bottom right corner of the canvas.
 // When selected, it will launch a Color dialog that will change the background 
 // of the canvas.
 Button button = new Button(canvas, SWT.PUSH);
 button.setText("Select Color...");
 button.addSelectionListener (new SelectionAdapter() {
 	public void widgetSelected(SelectionEvent e) {
 		ColorDialog dialog = new ColorDialog(shell);
 		dialog.open();
 		RGB rgb = dialog.getRGB();
 		if (rgb != null) {
 			if (color != null) color.dispose();
 			color = new Color(null, rgb);
 			canvas.setBackground(color);
 		}
 		
 	}
 });
 
 editor.horizontalAlignment = SWT.RIGHT;
 editor.verticalAlignment = SWT.BOTTOM;
 editor.grabHorizontal = false;
 editor.grabVertical = false;
 Point size = button.computeSize(SWT.DEFAULT, SWT.DEFAULT);
 editor.minimumWidth = size.x;
 editor.minimumHeight = size.y;
 editor.setEditor (button);

Since:: 1.0

Field Summary

boolean grabHorizontal
          Specifies whether the editor should be sized to use the entire width of the control.

boolean grabVertical
          Specifies whether the editor should be sized to use the entire height of the control.

int horizontalAlignment
          Specifies how the editor should be aligned relative to the control.

int minimumHeight
          Specifies the minimum height the editor can have.

int minimumWidth
          Specifies the minimum width the editor can have.

int verticalAlignment
          Specifies how the editor should be aligned relative to the control.

Constructor Summary

ControlEditor ( Composite parent)
          Creates a ControlEditor for the specified Composite.

Method Summary

void dispose ()
          Removes all associations between the Editor and the underlying composite.

Control getEditor ()
          Returns the Control that is displayed above the composite being edited.

void layout ()
          Lays out the control within the underlying composite.

void setEditor ( Control editor)
          Specify the Control that is to be displayed.

Methods inherited from class java.lang. Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

horizontalAlignment

public int horizontalAlignment

Specifies how the editor should be aligned relative to the control. Allowed values are SWT.LEFT, SWT.RIGHT and SWT.CENTER. The default value is SWT.CENTER.

grabHorizontal

public boolean grabHorizontal

Specifies whether the editor should be sized to use the entire width of the control. True means resize the editor to the same width as the cell. False means do not adjust the width of the editor. The default value is false.

minimumWidth

public int minimumWidth

Specifies the minimum width the editor can have. This is used in association with a true value of grabHorizontal. If the cell becomes smaller than the minimumWidth, the editor will not made smaller than the minimum width value. The default value is 0.

verticalAlignment

public int verticalAlignment

Specifies how the editor should be aligned relative to the control. Allowed values are SWT.TOP, SWT.BOTTOM and SWT.CENTER. The default value is SWT.CENTER.

grabVertical

public boolean grabVertical

Specifies whether the editor should be sized to use the entire height of the control. True means resize the editor to the same height as the underlying control. False means do not adjust the height of the editor. The default value is false.

minimumHeight

public int minimumHeight

Specifies the minimum height the editor can have. This is used in association with a true value of grabVertical. If the control becomes smaller than the minimumHeight, the editor will not made smaller than the minimum height value. The default value is 0.

Constructor Detail

ControlEditor

public ControlEditor(
Composite parent)

Creates a ControlEditor for the specified Composite.
Parameters:: parent - the Composite above which this editor will be displayed

Method Detail

dispose

public void dispose()

Removes all associations between the Editor and the underlying composite. The composite and the editor Control are not disposed.

getEditor

public 
Control getEditor()

Returns the Control that is displayed above the composite being edited.

Returns:: the Control that is displayed above the composite being edited

layout

public void layout()

Lays out the control within the underlying composite. This method should be called after changing one or more fields to force the Editor to resize.

setEditor

public void setEditor(
Control editor)

Specify the Control that is to be displayed.

Note: The Control provided as the editor must be created with its parent being the Composite specified in the ControlEditor constructor.

Parameters:: editor - the Control that is displayed above the composite being edited