examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/graphics/CountDownTab.java - platform/eclipse.platform.swt - Git at Google

 /*******************************************************************************
  * Copyright (c) 2006 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.swt.examples.graphics;

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

 /**
  * This tab presents a count down from 5 to 1, then displays SWT.
  * */
 public class CountDownTab extends AnimatedGraphicsTab {

 	final int startNumber = 5;			// number at which to start the countdown
 	int nextNumber = startNumber;		// next number to be displayed
 	int angle = -90;					// angle used to rotate the bar

 	Spinner lineWidthSpinner;			// spinner for line width
 	Combo aliasCombo, lineCapCombo;		// combo for alias type and line cap
 	int antialias, lineCap;				// antialias and linecap values
 	int[] capValues = { SWT.CAP_FLAT, SWT.CAP_SQUARE, SWT.CAP_ROUND };
 	int[] aliasValues = { SWT.DEFAULT, SWT.OFF, SWT.ON };

 	/**
 	 * Constructor
 	 *
 	 * @param example
 	 *            A GraphicsExample
 	 */
 	public CountDownTab(GraphicsExample example) {
 		super(example);
 	}

 	/**
 	 * This method creates the controls specific to the tab. The call to the
 	 * createControlPanel method in the super class create the controls that are
 	 * defined in the super class.
 	 *
 	 * @param parent
 	 *            The parent composite
 	 */
 	public void createControlPanel(Composite parent) {
 		super.createControlPanel(parent);

 		if (nextNumber < 1)
 			nextNumber = startNumber;

 		// add selection listener to reset nextNumber after
 		// the sequence has completed
 		playItem.addListener(SWT.Selection, new Listener() {
 			public void handleEvent(Event event) {
 				if (nextNumber < 1)
 					nextNumber = startNumber;
 			}
 		});

 		Composite comp;
 		GridLayout gridLayout = new GridLayout(2, false);

 		// create spinner for line width
 		comp = new Composite(parent, SWT.NONE);
 		comp.setLayout(gridLayout);
 		new Label(comp, SWT.CENTER).setText(GraphicsExample
 				.getResourceString("LineWidth")); //$NON-NLS-1$
 		lineWidthSpinner = new Spinner(comp, SWT.BORDER | SWT.WRAP);
 		lineWidthSpinner.setSelection(20);
 		lineWidthSpinner.setMinimum(1);
 		lineWidthSpinner.setMaximum(100);
 		lineWidthSpinner.addListener(SWT.Selection, new Listener() {
 			public void handleEvent(Event event) {
 				if (!pauseItem.isEnabled()) {
 					example.redraw();
 				}
 			}
 		});

 		// create drop down combo for antialiasing
 		comp = new Composite(parent, SWT.NONE);
 		comp.setLayout(gridLayout);
 		new Label(comp, SWT.CENTER).setText(GraphicsExample
 				.getResourceString("Antialiasing")); //$NON-NLS-1$
 		aliasCombo = new Combo(comp, SWT.DROP_DOWN);
 		aliasCombo.add("DEFAULT");
 		aliasCombo.add("OFF");
 		aliasCombo.add("ON");
 		aliasCombo.select(0);
 		antialias = aliasValues[0];
 		aliasCombo.addListener(SWT.Selection, new Listener() {
 			public void handleEvent(Event event) {
 				antialias = aliasValues[aliasCombo.getSelectionIndex()];
 				if (!pauseItem.isEnabled()) {
 					example.redraw();
 				}
 			}
 		});

 		// create drop down combo for line cap
 		comp = new Composite(parent, SWT.NONE);
 		comp.setLayout(gridLayout);
 		new Label(comp, SWT.CENTER).setText(GraphicsExample
 				.getResourceString("LineCap")); //$NON-NLS-1$
 		lineCapCombo = new Combo(comp, SWT.DROP_DOWN);
 		lineCapCombo.add("FLAT");
 		lineCapCombo.add("SQUARE");
 		lineCapCombo.add("ROUND");
 		lineCapCombo.select(0);
 		lineCap = capValues[0];
 		lineCapCombo.addListener(SWT.Selection, new Listener() {
 			public void handleEvent(Event event) {
 				lineCap = capValues[lineCapCombo.getSelectionIndex()];
 				if (!pauseItem.isEnabled()) {
 					example.redraw();
 				}
 			}
 		});
 	}

 	public String getCategory() {
 		return GraphicsExample.getResourceString("Misc"); //$NON-NLS-1$
 	}

 	public String getText() {
 		return GraphicsExample.getResourceString("Countdown"); //$NON-NLS-1$
 	}

 	public String getDescription() {
 		return GraphicsExample.getResourceString("CountdownDescription"); //$NON-NLS-1$
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.swt.examples.graphics.AnimatedGraphicsTab#getAnimationTime()
 	 */
 	public int getInitialAnimationTime() {
 		return 28;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.swt.examples.graphics.AnimatedGraphicsTab#next(int, int)
 	 */
 	public void next(int width, int height) {

 		if (angle == 270) {
 			nextNumber--;
 			if (nextNumber < 1) {
 				// stop animation
 				setAnimation(false);
 			}
 			angle = -90;
 		}
 		angle += 10;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.swt.examples.graphics.GraphicsTab#paint(org.eclipse.swt.graphics.GC,
 	 *      int, int)
 	 */
 	public void paint(GC gc, int width, int height) {
 		if (!example.checkAdvancedGraphics()) return;
 		Device device = gc.getDevice();

 		// diameter of the circle in pixels
 		int diameter = ((width < height) ? width - 25 : height - 25);

 		if (!getAnimation() && nextNumber == 0) {
 			Font font = new Font(device, getPlatformFontFace(1), diameter/2,
 					SWT.NONE);
 			gc.setFont(font);

 			// display "SWT"
 			gc.setForeground(device.getSystemColor(SWT.COLOR_DARK_BLUE));
 			gc.setTextAntialias(SWT.ON);

 			// determine the dimensions of the word
 			String text = GraphicsExample.getResourceString("SWT");
 			Point point = gc.stringExtent(text);
 			int textWidth = point.x;
 			int textHeight = point.y;
 			gc.drawString(text, (width-textWidth)/2,
 					(height-textHeight)/2, true);
 			font.dispose();

 		} else {

 			Font font = new Font(device, getPlatformFontFace(0),
 					6*diameter/10, SWT.NONE);
 			gc.setFont(font);

 			// set attributes from controls
 			gc.setLineWidth(lineWidthSpinner.getSelection());
 			gc.setLineCap(lineCap); // round line ends
 			gc.setAntialias(antialias); // smooth jagged edges
 			gc.setTextAntialias(antialias); // smooth jagged edges

 			// draw the circles
 			Path path = new Path(device);
 			path.addArc((width-diameter)/2, (height-diameter)/2,
 					diameter, diameter, 0, 360);
 			path.addArc((width-diameter+50)/2,
 					(height-diameter+50)/2, diameter-50, diameter-50,
 					0, 360);
 			gc.drawPath(path);
 			gc.setBackground(device.getSystemColor(SWT.COLOR_RED));
 			gc.fillPath(path);
 			path.dispose();

 			Point point = gc.stringExtent(new Integer(nextNumber).toString());
 			int textWidth = point.x;
 			int textHeight = point.y;

 			// draw the number
 			gc.drawString(new Integer(nextNumber).toString(),
 					(width-textWidth)/2, (height-textHeight)/2, true);

 			// draw the rotating arm
 			Transform transform = new Transform(device);
 			transform.translate(width/2, height/2);
 			transform.rotate(angle);
 			gc.setTransform(transform);
 			gc.setForeground(device.getSystemColor(SWT.COLOR_RED));
 			gc.drawLine(0, 0, diameter/2, 0);
 			transform.dispose();

 			font.dispose();
 		}
 	}

 	/**
 	 * Returns the name of a valid font for the resident platform.
 	 *
 	 * @param index
 	 *            index is used to determine the appropriate font face
 	 */
 	static String getPlatformFontFace(int index) {
 		if (SWT.getPlatform() == "win32") {
 			return new String[] { "Courier", "Impact" }[index];
 		} else if (SWT.getPlatform() == "motif") {
 			return new String[] { "Courier", "URW Gothic L" }[index];
 		} else if (SWT.getPlatform() == "gtk") {
 			return new String[] { "Courier", "Baekmuk Headline" }[index];
 		} else if (SWT.getPlatform() == "carbon") {
 			return new String[] { "Courier", "Impact" }[index];
 		} else { // photon, etc ...
 			return new String[] { "Courier", "Verdana" }[index];
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2006 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.swt.examples.graphics;

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

	/**
	* This tab presents a count down from 5 to 1, then displays SWT.
	* */
	public class CountDownTab extends AnimatedGraphicsTab {

	final int startNumber = 5; // number at which to start the countdown
	int nextNumber = startNumber; // next number to be displayed
	int angle = -90; // angle used to rotate the bar

	Spinner lineWidthSpinner; // spinner for line width
	Combo aliasCombo, lineCapCombo; // combo for alias type and line cap
	int antialias, lineCap; // antialias and linecap values
	int[] capValues = { SWT.CAP_FLAT, SWT.CAP_SQUARE, SWT.CAP_ROUND };
	int[] aliasValues = { SWT.DEFAULT, SWT.OFF, SWT.ON };

	/**
	* Constructor
	*
	* @param example
	* A GraphicsExample
	*/
	public CountDownTab(GraphicsExample example) {
	super(example);
	}

	/**
	* This method creates the controls specific to the tab. The call to the
	* createControlPanel method in the super class create the controls that are
	* defined in the super class.
	*
	* @param parent
	* The parent composite
	*/
	public void createControlPanel(Composite parent) {
	super.createControlPanel(parent);

	if (nextNumber < 1)
	nextNumber = startNumber;

	// add selection listener to reset nextNumber after
	// the sequence has completed
	playItem.addListener(SWT.Selection, new Listener() {
	public void handleEvent(Event event) {
	if (nextNumber < 1)
	nextNumber = startNumber;
	}
	});

	Composite comp;
	GridLayout gridLayout = new GridLayout(2, false);

	// create spinner for line width
	comp = new Composite(parent, SWT.NONE);
	comp.setLayout(gridLayout);
	new Label(comp, SWT.CENTER).setText(GraphicsExample
	.getResourceString("LineWidth")); //$NON-NLS-1$
	lineWidthSpinner = new Spinner(comp, SWT.BORDER \| SWT.WRAP);
	lineWidthSpinner.setSelection(20);
	lineWidthSpinner.setMinimum(1);
	lineWidthSpinner.setMaximum(100);
	lineWidthSpinner.addListener(SWT.Selection, new Listener() {
	public void handleEvent(Event event) {
	if (!pauseItem.isEnabled()) {
	example.redraw();
	}
	}
	});

	// create drop down combo for antialiasing
	comp = new Composite(parent, SWT.NONE);
	comp.setLayout(gridLayout);
	new Label(comp, SWT.CENTER).setText(GraphicsExample
	.getResourceString("Antialiasing")); //$NON-NLS-1$
	aliasCombo = new Combo(comp, SWT.DROP_DOWN);
	aliasCombo.add("DEFAULT");
	aliasCombo.add("OFF");
	aliasCombo.add("ON");
	aliasCombo.select(0);
	antialias = aliasValues[0];
	aliasCombo.addListener(SWT.Selection, new Listener() {
	public void handleEvent(Event event) {
	antialias = aliasValues[aliasCombo.getSelectionIndex()];
	if (!pauseItem.isEnabled()) {
	example.redraw();
	}
	}
	});

	// create drop down combo for line cap
	comp = new Composite(parent, SWT.NONE);
	comp.setLayout(gridLayout);
	new Label(comp, SWT.CENTER).setText(GraphicsExample
	.getResourceString("LineCap")); //$NON-NLS-1$
	lineCapCombo = new Combo(comp, SWT.DROP_DOWN);
	lineCapCombo.add("FLAT");
	lineCapCombo.add("SQUARE");
	lineCapCombo.add("ROUND");
	lineCapCombo.select(0);
	lineCap = capValues[0];
	lineCapCombo.addListener(SWT.Selection, new Listener() {
	public void handleEvent(Event event) {
	lineCap = capValues[lineCapCombo.getSelectionIndex()];
	if (!pauseItem.isEnabled()) {
	example.redraw();
	}
	}
	});
	}

	public String getCategory() {
	return GraphicsExample.getResourceString("Misc"); //$NON-NLS-1$
	}

	public String getText() {
	return GraphicsExample.getResourceString("Countdown"); //$NON-NLS-1$
	}

	public String getDescription() {
	return GraphicsExample.getResourceString("CountdownDescription"); //$NON-NLS-1$
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.swt.examples.graphics.AnimatedGraphicsTab#getAnimationTime()
	*/
	public int getInitialAnimationTime() {
	return 28;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.swt.examples.graphics.AnimatedGraphicsTab#next(int, int)
	*/
	public void next(int width, int height) {

	if (angle == 270) {
	nextNumber--;
	if (nextNumber < 1) {
	// stop animation
	setAnimation(false);
	}
	angle = -90;
	}
	angle += 10;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.swt.examples.graphics.GraphicsTab#paint(org.eclipse.swt.graphics.GC,
	* int, int)
	*/
	public void paint(GC gc, int width, int height) {
	if (!example.checkAdvancedGraphics()) return;
	Device device = gc.getDevice();

	// diameter of the circle in pixels
	int diameter = ((width < height) ? width - 25 : height - 25);

	if (!getAnimation() && nextNumber == 0) {
	Font font = new Font(device, getPlatformFontFace(1), diameter/2,
	SWT.NONE);
	gc.setFont(font);

	// display "SWT"
	gc.setForeground(device.getSystemColor(SWT.COLOR_DARK_BLUE));
	gc.setTextAntialias(SWT.ON);

	// determine the dimensions of the word
	String text = GraphicsExample.getResourceString("SWT");
	Point point = gc.stringExtent(text);
	int textWidth = point.x;
	int textHeight = point.y;
	gc.drawString(text, (width-textWidth)/2,
	(height-textHeight)/2, true);
	font.dispose();

	} else {

	Font font = new Font(device, getPlatformFontFace(0),
	6*diameter/10, SWT.NONE);
	gc.setFont(font);

	// set attributes from controls
	gc.setLineWidth(lineWidthSpinner.getSelection());
	gc.setLineCap(lineCap); // round line ends
	gc.setAntialias(antialias); // smooth jagged edges
	gc.setTextAntialias(antialias); // smooth jagged edges

	// draw the circles
	Path path = new Path(device);
	path.addArc((width-diameter)/2, (height-diameter)/2,
	diameter, diameter, 0, 360);
	path.addArc((width-diameter+50)/2,
	(height-diameter+50)/2, diameter-50, diameter-50,
	0, 360);
	gc.drawPath(path);
	gc.setBackground(device.getSystemColor(SWT.COLOR_RED));
	gc.fillPath(path);
	path.dispose();

	Point point = gc.stringExtent(new Integer(nextNumber).toString());
	int textWidth = point.x;
	int textHeight = point.y;

	// draw the number
	gc.drawString(new Integer(nextNumber).toString(),
	(width-textWidth)/2, (height-textHeight)/2, true);

	// draw the rotating arm
	Transform transform = new Transform(device);
	transform.translate(width/2, height/2);
	transform.rotate(angle);
	gc.setTransform(transform);
	gc.setForeground(device.getSystemColor(SWT.COLOR_RED));
	gc.drawLine(0, 0, diameter/2, 0);
	transform.dispose();

	font.dispose();
	}
	}

	/**
	* Returns the name of a valid font for the resident platform.
	*
	* @param index
	* index is used to determine the appropriate font face
	*/
	static String getPlatformFontFace(int index) {
	if (SWT.getPlatform() == "win32") {
	return new String[] { "Courier", "Impact" }[index];
	} else if (SWT.getPlatform() == "motif") {
	return new String[] { "Courier", "URW Gothic L" }[index];
	} else if (SWT.getPlatform() == "gtk") {
	return new String[] { "Courier", "Baekmuk Headline" }[index];
	} else if (SWT.getPlatform() == "carbon") {
	return new String[] { "Courier", "Impact" }[index];
	} else { // photon, etc ...
	return new String[] { "Courier", "Verdana" }[index];
	}
	}
	}