rangetab.java

很好的学习swt的 sample 很好的学习swt的 sample

package org.eclipse.swt.examples.controlexample;

/*
 * (c) Copyright IBM Corp. 2000, 2002.
 * This file is made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 */

import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.events.*;

abstract class RangeTab extends Tab {
	/* Style widgets added to the "Style" group */
	Button horizontalButton, verticalButton;

	/* Scale widgets added to the "Control" group */
	Scale minimumScale, selectionScale, maximumScale;

	/**
	 * Creates the Tab within a given instance of ControlExample.
	 */
	RangeTab(ControlExample instance) {
		super(instance);
	}

	/**
	 * Creates the "Control" widget children.
	 */
	void createControlWidgets () {
		/* Create controls specific to this example */
		createMinimumGroup ();
		createMaximumGroup ();
		createSelectionGroup ();
	}
	
	/**
	 * Create a group of widgets to control the maximum
	 * attribute of the example widget.
	 */
	void createMaximumGroup() {
	
		/* Create the group */
		Group maximumGroup = new Group (controlGroup, SWT.NULL);
		maximumGroup.setLayout (new GridLayout ());
		maximumGroup.setText (ControlExample.getResourceString("Maximum"));
		maximumGroup.setLayoutData (new GridData (GridData.FILL_HORIZONTAL));
	
		/* Create a scale widget */
		maximumScale = new Scale (maximumGroup, SWT.NULL);
		maximumScale.setMaximum (100);
		maximumScale.setSelection (100);
		maximumScale.setPageIncrement (10);
		maximumScale.setIncrement (5);
		
		GridData data = new GridData (GridData.FILL_HORIZONTAL);
		data.widthHint = 100;
		maximumScale.setLayoutData (data);
	
		/* Add the listeners */
		maximumScale.addSelectionListener(new SelectionAdapter () {
			public void widgetSelected (SelectionEvent event) {
				setWidgetMaximum ();
			};
		});
	}
	
	/**
	 * Create a group of widgets to control the minimum
	 * attribute of the example widget.
	 */
	void createMinimumGroup() {
	
		/* Create the group */
		Group minimumGroup = new Group (controlGroup, SWT.NULL);
		minimumGroup.setLayout (new GridLayout ());
		minimumGroup.setText (ControlExample.getResourceString("Minimum"));
		minimumGroup.setLayoutData (new GridData (GridData.FILL_HORIZONTAL));
	
		/* Create a scale widget */
		minimumScale = new Scale (minimumGroup, SWT.NULL);
		minimumScale.setMaximum (100);
		minimumScale.setPageIncrement (10);
		minimumScale.setIncrement (5);
	
		GridData data = new GridData (GridData.FILL_HORIZONTAL);
		data.widthHint = 100;
		minimumScale.setLayoutData (data);

		/* Add the listeners */
		minimumScale.addSelectionListener (new SelectionAdapter () {
			public void widgetSelected (SelectionEvent event) {
				setWidgetMinimum ();
			};
		});
	
	}
	
	/**
	 * Create a group of widgets to control the selection
	 * attribute of the example widget.
	 */
	void createSelectionGroup() {
	
		/* Create the group */
		Group selectionGroup = new Group(controlGroup, SWT.NULL);
		selectionGroup.setLayout(new GridLayout());
		GridData gridData = new GridData(GridData.FILL_HORIZONTAL);
		selectionGroup.setLayoutData(gridData);
		selectionGroup.setText(ControlExample.getResourceString("Selection"));
	
		/* Create a scale widget */
		selectionScale = new Scale (selectionGroup, SWT.NULL);
		selectionScale.setMaximum (100);
		selectionScale.setSelection (50);
		selectionScale.setPageIncrement (10);
		selectionScale.setIncrement (5);
	
		GridData data = new GridData (GridData.FILL_HORIZONTAL);
		data.widthHint = 100;
		selectionScale.setLayoutData (data);

		/* Add the listeners */
		selectionScale.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				setWidgetSelection ();
			};
		});
		
	}
	
	/**
	 * Creates the "Style" group.
	 */
	void createStyleGroup () {
		super.createStyleGroup ();
	
		/* Create the extra widgets */
		horizontalButton = new Button (styleGroup, SWT.RADIO);
		horizontalButton.setText ("SWT.HORIZONTAL");
		verticalButton = new Button (styleGroup, SWT.RADIO);
		verticalButton.setText ("SWT.VERTICAL");
		borderButton = new Button (styleGroup, SWT.CHECK);
		borderButton.setText ("SWT.BORDER");
	}
	
	/**
	 * Sets the state of the "Example" widgets.
	 */
	void setExampleWidgetState () {
		super.setExampleWidgetState ();
		setWidgetMinimum ();
		setWidgetMaximum ();
		setWidgetSelection ();
		Control [] controls = getExampleWidgets ();
		if (controls.length != 0){
			horizontalButton.setSelection ((controls [0].getStyle () & SWT.HORIZONTAL) != 0);
			verticalButton.setSelection ((controls [0].getStyle () & SWT.VERTICAL) != 0);
			borderButton.setSelection ((controls [0].getStyle () & SWT.BORDER) != 0);
		}
	}
	
	/**
	 * Sets the maximum of the "Example" widgets.
	 */
	abstract void setWidgetMaximum ();
	
	/**
	 * Sets the minimim of the "Example" widgets.
	 */
	abstract void setWidgetMinimum ();
	
	/**
	 * Sets the selection of the "Example" widgets.
	 */
	abstract void setWidgetSelection ();
}