content: /*******************************************************************************
   * Copyright (c) 2000, 2007 IBM Corporation and others.
   * All rights reserved. This program and the accompanying materials
   * are made available under the terms of the Eclipse Public License v1.0
   * which accompanies this distribution, and is available at
   * http://www.eclipse.org/legal/epl-v10.html
   *
   * Contributors:
   *     IBM Corporation - initial API and implementation
   *******************************************************************************/
  package org.eclipse.wst.jsdt.internal.ui.wizards.dialogfields;
  
  import org.eclipse.swt.SWT;
  import org.eclipse.swt.events.SelectionEvent;
  import org.eclipse.swt.events.SelectionListener;
  import org.eclipse.swt.layout.GridData;
  import org.eclipse.swt.widgets.Button;
  import org.eclipse.swt.widgets.Composite;
  import org.eclipse.swt.widgets.Control;
  import org.eclipse.swt.widgets.Label;
  import org.eclipse.swt.widgets.Text;
  import org.eclipse.wst.jsdt.internal.ui.util.SWTUtil;
  
  /**
   * Dialog field containing a label, text control and a button control.
   */
  public class StringButtonDialogField extends StringDialogField {
  		
  	private Button fBrowseButton;
  	private String fBrowseButtonLabel;
  	private IStringButtonAdapter fStringButtonAdapter;
  	
  	private boolean fButtonEnabled;
  	
  	public StringButtonDialogField(IStringButtonAdapter adapter) {
  		super();
  		fStringButtonAdapter= adapter;
  		fBrowseButtonLabel= "!Browse...!"; //$NON-NLS-1$
  		fButtonEnabled= true;
  	}
  
  	/**
  	 * Sets the label of the button.
  	 */
  	public void setButtonLabel(String label) {
  		fBrowseButtonLabel= label;
  	}
  	
  	// ------ adapter communication
  
  	/**
  	 * Programmatical pressing of the button
  	 */	
  	public void changeControlPressed() {
  		fStringButtonAdapter.changeControlPressed(this);
  	}
  	
  	// ------- layout helpers
  
  	/*
  	 * @see DialogField#doFillIntoGrid
  	 */		
  	public Control[] doFillIntoGrid(Composite parent, int nColumns) {
  		assertEnoughColumns(nColumns);
  		
  		Label label= getLabelControl(parent);
  		label.setLayoutData(gridDataForLabel(1));
  		Text text= getTextControl(parent);
  		text.setLayoutData(gridDataForText(nColumns - 2));
  		Button button= getChangeControl(parent);
  		button.setLayoutData(gridDataForButton(button, 1));
  	
  		return new Control[] { label, text, button };
  	}	
  
  	/*
  	 * @see DialogField#getNumberOfControls
  	 */		
  	public int getNumberOfControls() {
  		return 3;	
  	}
  	
  	protected static GridData gridDataForButton(Button button, int span) {
  		GridData gd= new GridData();
  		gd.horizontalAlignment= GridData.FILL;
  		gd.grabExcessHorizontalSpace= false;
  		gd.horizontalSpan= span;
  		gd.widthHint = SWTUtil.getButtonWidthHint(button);		
  		return gd;
  	}		
  	
  	// ------- ui creation	
  
  	/**
  	 * Creates or returns the created buttom widget.
  	 * @param parent The parent composite or <code>null</code> if the widget has
  	 * already been created.
  	 */		
  	public Button getChangeControl(Composite parent) {
  		if (fBrowseButton == null) {
  			assertCompositeNotNull(parent);
  			
  			fBrowseButton= new Button(parent, SWT.PUSH);
  			fBrowseButton.setFont(parent.getFont());
  			fBrowseButton.setText(fBrowseButtonLabel);
  			fBrowseButton.setEnabled(isEnabled() && fButtonEnabled);
  			fBrowseButton.addSelectionListener(new SelectionListener() {
  				public void widgetDefaultSelected(SelectionEvent e) {
  					changeControlPressed();
  				}
  				public void widgetSelected(SelectionEvent e) {
  					changeControlPressed();
  				}
  			});	
  			
  		}
  		return fBrowseButton;
  	}
  	
  	// ------ enable / disable management
  	
  	/**
  	 * Sets the enable state of the button.
  	 */
  	public void enableButton(boolean enable) {
  		if (isOkToUse(fBrowseButton)) {
  			fBrowseButton.setEnabled(isEnabled() && enable);
  		}
  		fButtonEnabled= enable;
  	}
  
  	/*
  	 * @see DialogField#updateEnableState
  	 */	
  	protected void updateEnableState() {
  		super.updateEnableState();
  		if (isOkToUse(fBrowseButton)) {
  			fBrowseButton.setEnabled(isEnabled() && fButtonEnabled);
  		}
  	}	
  }
  