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/*******************************************************************************
* Copyright (c) 2008, 2016 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.SWT;
import org.eclipse.swt.accessibility.ACC;
import org.eclipse.swt.accessibility.AccessibleAdapter;
import org.eclipse.swt.accessibility.AccessibleControlAdapter;
import org.eclipse.swt.accessibility.AccessibleControlEvent;
import org.eclipse.swt.accessibility.AccessibleEvent;
import org.eclipse.swt.events.FocusAdapter;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.KeyAdapter;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
/**
* 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 final int SQUARE = 0;
static final int CIRCLE = 1;
static final int TRIANGLE = 2;
static ResourceBundle bundle = ResourceBundle.getBundle("examples_accessibility");
int color = SWT.COLOR_BLUE;
int 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(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 == 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() {
@Override
public void focusGained(FocusEvent e) {
redraw();
}
@Override
public void focusLost(FocusEvent e) {
redraw();
}
});
addMouseListener(new MouseAdapter() {
@Override
public void mouseDown(MouseEvent e) {
if (getClientArea().contains(e.x, e.y)) {
setFocus();
}
}
});
addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
// key listener enables traversal out
}
});
addTraverseListener(e -> {
switch (e.detail) {
case SWT.TRAVERSE_TAB_NEXT:
case SWT.TRAVERSE_TAB_PREVIOUS:
e.doit = true;
break;
}
});
getAccessible().addAccessibleListener(new AccessibleAdapter() {
@Override
public void getName(AccessibleEvent e) {
MessageFormat formatter = new MessageFormat("");
formatter.applyPattern(bundle.getString("name")); //$NON_NLS$
String colorName = bundle.getString("color" + color); //$NON_NLS$
String shapeName = bundle.getString("shape" + shape); //$NON_NLS$
e.result = formatter.format(new String [] {colorName, shapeName}); //$NON_NLS$
}
});
getAccessible().addAccessibleControlListener(new AccessibleControlAdapter() {
@Override
public void getRole(AccessibleControlEvent e) {
e.detail = ACC.ROLE_GRAPHIC;
}
@Override
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 color;
}
/**
* Return the receiver's shape.
* The default shape is SQUARE.
*
* @return the shape, which may be either CIRCLE or SQUARE
*/
public int getShape () {
return 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.
* The default shape is SQUARE.
*
* @param shape an int that can be either CIRCLE or SQUARE
*/
public void setShape (int shape) {
this.shape = shape;
}
}
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