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/*******************************************************************************
* Copyright (c) 2008 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.accessibility;
import java.text.MessageFormat;
import java.util.ResourceBundle;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.accessibility.*;
/**
* Instances of this class represent an accessible, focusable, user interface object
* that has a shape and a color. From an accessibility point of view, they imitate a
* "label" or "static text" whose name is its color and shape.
*/
public class Shape extends Canvas {
static ResourceBundle bundle = ResourceBundle.getBundle("examples_accessibility");
int color = SWT.COLOR_BLUE;
String shape = "square";
/**
* Constructs a new instance of this class given its parent
* and a style value describing its behavior and appearance.
*
* @param parent a composite control which will be the parent of the new instance (cannot be null)
* @param style the style of control to construct
*/
public Shape(Composite parent, int style) {
super (parent, style);
addListeners();
}
void addListeners() {
addPaintListener(new PaintListener() {
public void paintControl(PaintEvent e) {
GC gc = e.gc;
Display display = getDisplay();
Color c = display.getSystemColor(color);
gc.setBackground(c);
Rectangle rect = getClientArea();
int length = Math.min(rect.width, rect.height);
if (shape.equals(bundle.getString("circle"))) {
gc.fillOval(0, 0, length, length);
} else {
gc.fillRectangle(0, 0, length, length);
}
if (isFocusControl()) gc.drawFocus(rect.x, rect.y, rect.width, rect.height);
}
});
addFocusListener(new FocusAdapter() {
public void focusGained(FocusEvent e) {
redraw();
}
public void focusLost(FocusEvent e) {
redraw();
}
});
addMouseListener(new MouseAdapter() {
public void mouseDown(MouseEvent e) {
if (getClientArea().contains(e.x, e.y)) {
setFocus();
}
}
});
addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
// key listener enables traversal out
}
});
addTraverseListener(new TraverseListener() {
public void keyTraversed(TraverseEvent e) {
switch (e.detail) {
case SWT.TRAVERSE_TAB_NEXT:
case SWT.TRAVERSE_TAB_PREVIOUS:
e.doit = true;
break;
}
}
});
getAccessible().addAccessibleListener(new AccessibleAdapter() {
public void getName(AccessibleEvent e) {
MessageFormat formatter = new MessageFormat("");
formatter.applyPattern(bundle.getString("name"));
String colorName = bundle.getString("color" + color);
e.result = formatter.format(new String [] {colorName, shape}); //$NON_NLS$
}
});
getAccessible().addAccessibleControlListener(new AccessibleControlAdapter() {
public void getRole(AccessibleControlEvent e) {
e.detail = ACC.ROLE_LABEL;
}
public void getState(AccessibleControlEvent e) {
e.detail = ACC.STATE_FOCUSABLE;
if (isFocusControl()) e.detail |= ACC.STATE_FOCUSED;
}
});
}
/**
* Return the receiver's color.
* The default color is SWT.COLOR_BLUE.
*
* @return the color, which may be any of the SWT.COLOR_ constants
*/
public int getColor () {
return this.color;
}
/**
* Return the receiver's shape.
* The default shape is "square".
*
* @return the shape name string, which may be either "circle" or "square"
*/
public String getShape () {
return this.shape;
}
/**
* Set the receiver's color to the specified color.
* The default color is SWT.COLOR_BLUE.
*
* @param color any of the SWT.COLOR_ constants
*/
public void setColor (int color) {
this.color = color;
}
/**
* Set the receiver's shape to the specified shape name string.
* The default shape is "square".
*
* @param shape a string that can be either "circle" or "square"
*/
public void setShape (String shape) {
this.shape = shape;
}
}
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