examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/graphics/GradientDialog.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 java.util.*;

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

 /**
  * This dialog is used for prompting the user to select two colors for the
  * creation of a gradient.
  */
 public class GradientDialog extends Dialog {

 	Canvas canvas;

 	Button colorButton1, colorButton2;		// color buttons

 	Button okButton, cancelButton;

 	Menu menu1, menu2;

 	RGB rgb1, rgb2;			// first and second color used in gradient
 	int returnVal; 			// value to be returned by open(), set to SWT.OK
 							// if the ok button has been pressed
 	ArrayList resources;

 	public GradientDialog(Shell parent) {
 		this (parent, SWT.PRIMARY_MODAL);
 	}

 	public GradientDialog(Shell parent, int style) {
 		super(parent, style);
 		rgb1 = rgb2 = null;
 		returnVal = SWT.CANCEL;
 		resources = new ArrayList();
 	}

 	/**
 	 * Sets up the dialog and opens it.
 	 * */
 	public int open() {
 		final Shell dialog = new Shell(getParent(), SWT.DIALOG_TRIM | SWT.RESIZE | getStyle());
 		dialog.setText(GraphicsExample.getResourceString("Gradient")); //$NON-NLS-1$

 		GridLayout gridLayout = new GridLayout();
 	    gridLayout.numColumns = 2;
 	    gridLayout.marginHeight = 10;
 	    gridLayout.marginWidth = 10;
 	    dialog.setLayout(gridLayout);

 	    // create the controls in the dialog
 	    createDialogControls(dialog);

 		dialog.addListener(SWT.Close, new Listener() {
 			public void handleEvent(Event event) {
 				for (int i = 0; i < resources.size(); i++) {
 					Object obj = resources.get(i);
 					if (obj != null && obj instanceof Resource) {
 						((Resource) obj).dispose();
 					}
 				}
 				dialog.dispose();
 			}
 		});

 		dialog.setDefaultButton (okButton);
 		dialog.pack ();
 		Rectangle rect = getParent().getMonitor().getBounds();
 		Rectangle bounds = dialog.getBounds();
 		dialog.setLocation(rect.x + (rect.width - bounds.width) / 2, rect.y + (rect.height - bounds.height) / 2);
 		dialog.setMinimumSize(bounds.width, bounds.height);

 		dialog.open ();

 		Display display = getParent().getDisplay();
 		while (!dialog.isDisposed()) {
 			if (!display.readAndDispatch()) display.sleep();
 		}

 		if (menu1 != null) {
 			menu1.dispose();
 			menu1 = null;
 		}

 		if (menu2 != null) {
 			menu2.dispose();
 			menu2 = null;
 		}

 		return returnVal;
 	}

 	/**
 	 * Creates the controls of the dialog.
 	 * */
 	public void createDialogControls(final Shell parent) {
 		final Display display = parent.getDisplay();

 		// message
 		Label message = new Label(parent, SWT.NONE);
 		message.setText(GraphicsExample.getResourceString("GradientDlgMsg"));
 		GridData gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
 		gridData.horizontalSpan = 2;
 		message.setLayoutData(gridData);

 		// default colors are white and black
 		if (rgb1 == null || rgb2 == null) {
 			rgb1 = display.getSystemColor(SWT.COLOR_WHITE).getRGB();
 			rgb2 = display.getSystemColor(SWT.COLOR_BLACK).getRGB();
 		}

 		// canvas
 		canvas = new Canvas(parent, SWT.NONE);
 		gridData = new GridData(GridData.FILL_BOTH);
 		gridData.widthHint = 200;
 		gridData.heightHint = 100;
 		canvas.setLayoutData(gridData);
 		canvas.addListener (SWT.Paint, new Listener () {
 			public void handleEvent (Event e) {
 				Image preview = null;
 				Point size = canvas.getSize();
 				Color color1 = new Color(display, rgb1);
 				Color color2 = new Color(display, rgb2);
 				preview = GraphicsExample.createImage(display, color1, color2, size.x, size.y);
 				if (preview != null) {
 					e.gc.drawImage (preview, 0, 0);
 				}
 				preview.dispose();
 				color1.dispose();
 				color2.dispose();
 			}
 		});

 		// composite used for both color buttons
 		Composite colorButtonComp = new Composite(parent, SWT.NONE);

 		// layout buttons
 		RowLayout layout = new RowLayout();;
 		layout.type = SWT.VERTICAL;
 		layout.pack = false;
 		colorButtonComp.setLayout(layout);

 		// position composite
 		gridData = new GridData(GridData.VERTICAL_ALIGN_BEGINNING);
 	    colorButtonComp.setLayoutData(gridData);

 		ColorMenu colorMenu = new ColorMenu();

 		// color controls: first color
 		colorButton1 = new Button(colorButtonComp, SWT.PUSH);
 		colorButton1.setText(GraphicsExample.getResourceString("GradientDlgButton1"));
 		Color color1 = new Color(display, rgb1);
 		Image img1 = GraphicsExample.createImage(display, color1);
 		color1.dispose();
 		colorButton1.setImage(img1);
 		resources.add(img1);
 		menu1 = colorMenu.createMenu(parent.getParent(), new ColorListener() {
 			public void setColor(GraphicsBackground gb) {
 				rgb1 = gb.getBgColor1().getRGB();
 				colorButton1.setImage(gb.getThumbNail());
 				if (canvas != null) canvas.redraw();
 			}
 		});
 		colorButton1.addListener(SWT.Selection, new Listener() {
 			public void handleEvent(Event event) {
 				final Button button = (Button) event.widget;
 				final Composite parent = button.getParent();
 				Rectangle bounds = button.getBounds();
 				Point point = parent.toDisplay(new Point(bounds.x, bounds.y));
 				menu1.setLocation(point.x, point.y + bounds.height);
 				menu1.setVisible(true);
 			}
 		});

 		// color controls: second color
 		colorButton2 = new Button(colorButtonComp, SWT.PUSH);
 		colorButton2.setText(GraphicsExample.getResourceString("GradientDlgButton2"));
 		Color color2 = new Color(display, rgb2);
 		Image img2 = GraphicsExample.createImage(display, color2);
 		color2.dispose();
 		colorButton2.setImage(img2);
 		resources.add(img2);
 		menu2 = colorMenu.createMenu(parent.getParent(), new ColorListener() {
 			public void setColor(GraphicsBackground gb) {
 				rgb2 = gb.getBgColor1().getRGB();
 				colorButton2.setImage(gb.getThumbNail());
 				if (canvas != null) canvas.redraw();
 			}
 		});
 		colorButton2.addListener(SWT.Selection, new Listener() {
 			public void handleEvent(Event event) {
 				final Button button = (Button) event.widget;
 				final Composite parent = button.getParent();
 				Rectangle bounds = button.getBounds();
 				Point point = parent.toDisplay(new Point(bounds.x, bounds.y));
 				menu2.setLocation(point.x, point.y + bounds.height);
 				menu2.setVisible(true);
 			}
 		});

 		// composite used for ok and cancel buttons
 		Composite okCancelComp = new Composite(parent, SWT.NONE);

 		// layout buttons
 		RowLayout rowLayout = new RowLayout();
 		rowLayout.pack = false;
 		rowLayout.marginTop = 5;
 		okCancelComp.setLayout(rowLayout);

 		// position composite
 		gridData = new GridData(GridData.HORIZONTAL_ALIGN_END);
 	    gridData.horizontalSpan = 2;
 	    okCancelComp.setLayoutData(gridData);

 	    // OK button
 		okButton = new Button (okCancelComp, SWT.PUSH);
 		okButton.setText("&OK");
 		okButton.addListener(SWT.Selection, new Listener() {
 			public void handleEvent(Event event) {
 				returnVal = SWT.OK;
 				parent.close();
 			}
 		});

 		// cancel button
 		cancelButton = new Button (okCancelComp, SWT.PUSH);
 		cancelButton.setText("&Cancel");
 		cancelButton.addListener(SWT.Selection, new Listener() {
 			public void handleEvent(Event event) {
 				parent.close();
 			}
 		});
 	}

 	/**
 	 * Returns the first RGB selected by the user.
 	 * */
 	public RGB getFirstRGB() {
 		return rgb1;
 	}

 	/**
 	 * Sets the first RGB.
 	 * @param rgb
 	 */
 	public void setFirstRGB(RGB rgb) {
 		this.rgb1 = rgb;
 	}

 	/**
 	 * Returns the second RGB selected by the user.
 	 * */
 	public RGB getSecondRGB() {
 		return rgb2;
 	}

 	/**
 	 * Sets the second RGB.
 	 * @param rgb
 	 */
 	public void setSecondRGB(RGB rgb) {
 		this.rgb2 = rgb;
 	}
 }
	/*******************************************************************************
	* 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 java.util.*;

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

	/**
	* This dialog is used for prompting the user to select two colors for the
	* creation of a gradient.
	*/
	public class GradientDialog extends Dialog {

	Canvas canvas;

	Button colorButton1, colorButton2; // color buttons

	Button okButton, cancelButton;

	Menu menu1, menu2;

	RGB rgb1, rgb2; // first and second color used in gradient
	int returnVal; // value to be returned by open(), set to SWT.OK
	// if the ok button has been pressed
	ArrayList resources;

	public GradientDialog(Shell parent) {
	this (parent, SWT.PRIMARY_MODAL);
	}

	public GradientDialog(Shell parent, int style) {
	super(parent, style);
	rgb1 = rgb2 = null;
	returnVal = SWT.CANCEL;
	resources = new ArrayList();
	}

	/**
	* Sets up the dialog and opens it.
	* */
	public int open() {
	final Shell dialog = new Shell(getParent(), SWT.DIALOG_TRIM \| SWT.RESIZE \| getStyle());
	dialog.setText(GraphicsExample.getResourceString("Gradient")); //$NON-NLS-1$

	GridLayout gridLayout = new GridLayout();
	gridLayout.numColumns = 2;
	gridLayout.marginHeight = 10;
	gridLayout.marginWidth = 10;
	dialog.setLayout(gridLayout);

	// create the controls in the dialog
	createDialogControls(dialog);

	dialog.addListener(SWT.Close, new Listener() {
	public void handleEvent(Event event) {
	for (int i = 0; i < resources.size(); i++) {
	Object obj = resources.get(i);
	if (obj != null && obj instanceof Resource) {
	((Resource) obj).dispose();
	}
	}
	dialog.dispose();
	}
	});

	dialog.setDefaultButton (okButton);
	dialog.pack ();
	Rectangle rect = getParent().getMonitor().getBounds();
	Rectangle bounds = dialog.getBounds();
	dialog.setLocation(rect.x + (rect.width - bounds.width) / 2, rect.y + (rect.height - bounds.height) / 2);
	dialog.setMinimumSize(bounds.width, bounds.height);

	dialog.open ();

	Display display = getParent().getDisplay();
	while (!dialog.isDisposed()) {
	if (!display.readAndDispatch()) display.sleep();
	}

	if (menu1 != null) {
	menu1.dispose();
	menu1 = null;
	}

	if (menu2 != null) {
	menu2.dispose();
	menu2 = null;
	}

	return returnVal;
	}

	/**
	* Creates the controls of the dialog.
	* */
	public void createDialogControls(final Shell parent) {
	final Display display = parent.getDisplay();

	// message
	Label message = new Label(parent, SWT.NONE);
	message.setText(GraphicsExample.getResourceString("GradientDlgMsg"));
	GridData gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
	gridData.horizontalSpan = 2;
	message.setLayoutData(gridData);

	// default colors are white and black
	if (rgb1 == null \|\| rgb2 == null) {
	rgb1 = display.getSystemColor(SWT.COLOR_WHITE).getRGB();
	rgb2 = display.getSystemColor(SWT.COLOR_BLACK).getRGB();
	}

	// canvas
	canvas = new Canvas(parent, SWT.NONE);
	gridData = new GridData(GridData.FILL_BOTH);
	gridData.widthHint = 200;
	gridData.heightHint = 100;
	canvas.setLayoutData(gridData);
	canvas.addListener (SWT.Paint, new Listener () {
	public void handleEvent (Event e) {
	Image preview = null;
	Point size = canvas.getSize();
	Color color1 = new Color(display, rgb1);
	Color color2 = new Color(display, rgb2);
	preview = GraphicsExample.createImage(display, color1, color2, size.x, size.y);
	if (preview != null) {
	e.gc.drawImage (preview, 0, 0);
	}
	preview.dispose();
	color1.dispose();
	color2.dispose();
	}
	});

	// composite used for both color buttons
	Composite colorButtonComp = new Composite(parent, SWT.NONE);

	// layout buttons
	RowLayout layout = new RowLayout();;
	layout.type = SWT.VERTICAL;
	layout.pack = false;
	colorButtonComp.setLayout(layout);

	// position composite
	gridData = new GridData(GridData.VERTICAL_ALIGN_BEGINNING);
	colorButtonComp.setLayoutData(gridData);

	ColorMenu colorMenu = new ColorMenu();

	// color controls: first color
	colorButton1 = new Button(colorButtonComp, SWT.PUSH);
	colorButton1.setText(GraphicsExample.getResourceString("GradientDlgButton1"));
	Color color1 = new Color(display, rgb1);
	Image img1 = GraphicsExample.createImage(display, color1);
	color1.dispose();
	colorButton1.setImage(img1);
	resources.add(img1);
	menu1 = colorMenu.createMenu(parent.getParent(), new ColorListener() {
	public void setColor(GraphicsBackground gb) {
	rgb1 = gb.getBgColor1().getRGB();
	colorButton1.setImage(gb.getThumbNail());
	if (canvas != null) canvas.redraw();
	}
	});
	colorButton1.addListener(SWT.Selection, new Listener() {
	public void handleEvent(Event event) {
	final Button button = (Button) event.widget;
	final Composite parent = button.getParent();
	Rectangle bounds = button.getBounds();
	Point point = parent.toDisplay(new Point(bounds.x, bounds.y));
	menu1.setLocation(point.x, point.y + bounds.height);
	menu1.setVisible(true);
	}
	});

	// color controls: second color
	colorButton2 = new Button(colorButtonComp, SWT.PUSH);
	colorButton2.setText(GraphicsExample.getResourceString("GradientDlgButton2"));
	Color color2 = new Color(display, rgb2);
	Image img2 = GraphicsExample.createImage(display, color2);
	color2.dispose();
	colorButton2.setImage(img2);
	resources.add(img2);
	menu2 = colorMenu.createMenu(parent.getParent(), new ColorListener() {
	public void setColor(GraphicsBackground gb) {
	rgb2 = gb.getBgColor1().getRGB();
	colorButton2.setImage(gb.getThumbNail());
	if (canvas != null) canvas.redraw();
	}
	});
	colorButton2.addListener(SWT.Selection, new Listener() {
	public void handleEvent(Event event) {
	final Button button = (Button) event.widget;
	final Composite parent = button.getParent();
	Rectangle bounds = button.getBounds();
	Point point = parent.toDisplay(new Point(bounds.x, bounds.y));
	menu2.setLocation(point.x, point.y + bounds.height);
	menu2.setVisible(true);
	}
	});

	// composite used for ok and cancel buttons
	Composite okCancelComp = new Composite(parent, SWT.NONE);

	// layout buttons
	RowLayout rowLayout = new RowLayout();
	rowLayout.pack = false;
	rowLayout.marginTop = 5;
	okCancelComp.setLayout(rowLayout);

	// position composite
	gridData = new GridData(GridData.HORIZONTAL_ALIGN_END);
	gridData.horizontalSpan = 2;
	okCancelComp.setLayoutData(gridData);

	// OK button
	okButton = new Button (okCancelComp, SWT.PUSH);
	okButton.setText("&OK");
	okButton.addListener(SWT.Selection, new Listener() {
	public void handleEvent(Event event) {
	returnVal = SWT.OK;
	parent.close();
	}
	});

	// cancel button
	cancelButton = new Button (okCancelComp, SWT.PUSH);
	cancelButton.setText("&Cancel");
	cancelButton.addListener(SWT.Selection, new Listener() {
	public void handleEvent(Event event) {
	parent.close();
	}
	});
	}

	/**
	* Returns the first RGB selected by the user.
	* */
	public RGB getFirstRGB() {
	return rgb1;
	}

	/**
	* Sets the first RGB.
	* @param rgb
	*/
	public void setFirstRGB(RGB rgb) {
	this.rgb1 = rgb;
	}

	/**
	* Returns the second RGB selected by the user.
	* */
	public RGB getSecondRGB() {
	return rgb2;
	}

	/**
	* Sets the second RGB.
	* @param rgb
	*/
	public void setSecondRGB(RGB rgb) {
	this.rgb2 = rgb;
	}
	}