CustomFontTab.java

/*******************************************************************************
 * 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.ArrayList;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Device;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Pattern;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.Spinner;

/**
 * This tab demonstrates various text fonts. It allows the user to specify font parameters such as face, style and size.
 */
public class CustomFontTab extends GraphicsTab {

	Button				colorButton;
	Combo				fontFaceCb, fontStyleCb;
	GraphicsBackground	fontForeground;
	ArrayList			fontNames;
	Spinner				fontPointSpinner;
	String[]			fontStyles;
	Menu				menu;
	int[]				styleValues;
	String				text	= GraphicsExample.getResourceString("SWT");

	public CustomFontTab(GraphicsExample example) {
		super(example);

		// create list of fonts for this platform
		FontData[] fontData = Display.getCurrent().getFontList(null, true);
		fontNames = new ArrayList();
		for (int i = 0; i < fontData.length; i++) {
			// remove duplicates and sort
			String nextName = fontData[i].getName();
			if (!fontNames.contains(nextName)) {
				int j = 0;
				while (j < fontNames.size() && nextName.compareTo((String) fontNames.get(j)) > 0)
					j++;
				fontNames.add(j, nextName);
			}
		}
		fontStyles = new String[] { GraphicsExample.getResourceString("Regular"), //$NON-NLS-1$
				GraphicsExample.getResourceString("Italic"), //$NON-NLS-1$
				GraphicsExample.getResourceString("Bold"), //$NON-NLS-1$
				GraphicsExample.getResourceString("BoldItalic") //$NON-NLS-1$
		};
		styleValues = new int[] { SWT.NORMAL, SWT.ITALIC, SWT.BOLD, SWT.BOLD | SWT.ITALIC };
	}

	public void createControlPanel(Composite parent) {

		Composite mainComp = new Composite(parent, SWT.NONE);
		mainComp.setLayout(new RowLayout());

		// create combo for font face
		Composite comp = new Composite(mainComp, SWT.NONE);
		comp.setLayout(new GridLayout(2, false));

		new Label(comp, SWT.LEFT).setText(GraphicsExample.getResourceString("FontFace")); //$NON-NLS-1$
		fontFaceCb = new Combo(comp, SWT.DROP_DOWN);
		for (int i = 0; i < fontNames.size(); i++) {
			String name = (String) fontNames.get(i);
			fontFaceCb.add(name);
		}
		fontFaceCb.select(0);
		fontFaceCb.addListener(SWT.Selection, new Listener() {
			public void handleEvent(Event event) {
				example.redraw();
			}
		});

		// create combo for font style
		comp = new Composite(mainComp, SWT.NONE);
		comp.setLayout(new GridLayout(2, false));

		new Label(comp, SWT.LEFT).setText(GraphicsExample.getResourceString("FontStyle")); //$NON-NLS-1$
		fontStyleCb = new Combo(comp, SWT.DROP_DOWN);
		for (int i = 0; i < fontStyles.length; i++)
			fontStyleCb.add(fontStyles[i]);
		fontStyleCb.select(0);
		fontStyleCb.addListener(SWT.Selection, new Listener() {
			public void handleEvent(Event event) {
				example.redraw();
			}
		});

		// create spinner for font size (points)
		comp = new Composite(mainComp, SWT.NONE);
		comp.setLayout(new GridLayout(2, false));

		new Label(comp, SWT.LEFT).setText(GraphicsExample.getResourceString("FontSize")); //$NON-NLS-1$
		fontPointSpinner = new Spinner(comp, SWT.BORDER | SWT.WRAP);
		fontPointSpinner.setMinimum(1);
		fontPointSpinner.setMaximum(1000);
		fontPointSpinner.setSelection(200);
		fontPointSpinner.addListener(SWT.Selection, new Listener() {
			public void handleEvent(Event event) {
				example.redraw();
			}
		});

		ColorMenu cm = new ColorMenu();
		cm.setColorItems(true);
		cm.setPatternItems(example.checkAdvancedGraphics());
		menu = cm.createMenu(parent.getParent(), new ColorListener() {
			public void setColor(GraphicsBackground gb) {
				fontForeground = gb;
				colorButton.setImage(gb.getThumbNail());
				example.redraw();
			}
		});

		// initialize the background to the 2nd item in the menu (black)
		fontForeground = (GraphicsBackground) menu.getItem(1).getData();

		// create color button
		comp = new Composite(parent, SWT.NONE);
		comp.setLayout(new GridLayout());

		colorButton = new Button(comp, SWT.PUSH);
		colorButton.setText(GraphicsExample.getResourceString("Color")); //$NON-NLS-1$
		colorButton.setImage(fontForeground.getThumbNail());
		colorButton.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));
				menu.setLocation(point.x, point.y + bounds.height);
				menu.setVisible(true);
			}
		});
	}

	public void dispose() {
		if (menu != null) {
			menu.dispose();
			menu = null;
		}
	}

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

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

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

	/*
	 * (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();

		String fontFace = (String) fontNames.get(fontFaceCb.getSelectionIndex());
		int points = fontPointSpinner.getSelection();
		int style = styleValues[fontStyleCb.getSelectionIndex()];

		Font font = new Font(device, fontFace, points, style);
		gc.setFont(font);
		gc.setTextAntialias(SWT.ON);

		Point size = gc.stringExtent(text);
		int textWidth = size.x;
		int textHeight = size.y;

		Pattern pattern = null;
		if (fontForeground.getBgColor1() != null)
			gc.setForeground(fontForeground.getBgColor1());
		else if (fontForeground.getBgImage() != null) {
			pattern = new Pattern(device, fontForeground.getBgImage());
			gc.setForegroundPattern(pattern);
		}

		gc.drawString(text, (width - textWidth) / 2, (height - textHeight) / 2, true);

		font.dispose();
		if (pattern != null)
			pattern.dispose();
	}

}