Example usage for org.eclipse.swt.widgets Canvas getAccessible

Introduction

In this page you can find the example usage for org.eclipse.swt.widgets Canvas getAccessible.

Prototype

public Accessible getAccessible() 

Source Link

Document

Returns the accessible object for the receiver.

Usage

From source file:org.eclipse.swt.examples.accessibility.AccessibleValueExample.java

public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    shell.setText("Accessible Value Example");

    final Canvas canvas = new Canvas(shell, SWT.DOUBLE_BUFFERED);
    canvas.addPaintListener(e -> {//from  ww w. j a va 2 s .c o m
        Rectangle rect = canvas.getClientArea();
        String val = String.valueOf(value);
        Point size = e.gc.stringExtent(val);
        e.gc.setBackground(e.display.getSystemColor(SWT.COLOR_LIST_SELECTION));
        e.gc.fillRectangle(0, 0, rect.width * value / (max - min), rect.height);
        e.gc.drawString(val, rect.x + (rect.width - size.x) / 2, rect.y + (rect.height - size.y) / 2, true);
    });

    Accessible accessible = canvas.getAccessible();
    accessible.addAccessibleListener(new AccessibleAdapter() {
        @Override
        public void getName(AccessibleEvent e) {
            e.result = "The value of this canvas is " + value;
        }
    });
    accessible.addAccessibleControlListener(new AccessibleControlAdapter() {
        @Override
        public void getRole(AccessibleControlEvent e) {
            e.detail = ACC.ROLE_PROGRESSBAR;
        }
    });
    accessible.addAccessibleValueListener(new AccessibleValueAdapter() {
        @Override
        public void setCurrentValue(AccessibleValueEvent e) {
            value = e.value.intValue();
            canvas.redraw();
        }

        @Override
        public void getMinimumValue(AccessibleValueEvent e) {
            e.value = Integer.valueOf(min);
        }

        @Override
        public void getMaximumValue(AccessibleValueEvent e) {
            e.value = Integer.valueOf(max);
        }

        @Override
        public void getCurrentValue(AccessibleValueEvent e) {
            e.value = Integer.valueOf(value);
        }
    });

    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

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From source file:org.eclipse.swt.examples.accessibility.AccessibleActionExample.java

public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    shell.setText("Accessible Action Example");

    Button button = new Button(shell, SWT.PUSH);
    button.setText("Button");

    final Canvas customButton = new Canvas(shell, SWT.NONE) {
        @Override/*from  w ww.ja va 2s.c  om*/
        public Point computeSize(int wHint, int hHint, boolean changed) {
            GC gc = new GC(this);
            Point point = gc.stringExtent(buttonText);
            gc.dispose();
            point.x += MARGIN;
            point.y += MARGIN;
            return point;
        }
    };
    customButton.addPaintListener(e -> {
        Rectangle clientArea = customButton.getClientArea();
        Point stringExtent = e.gc.stringExtent(buttonText);
        int x = clientArea.x + (clientArea.width - stringExtent.x) / 2;
        int y = clientArea.y + (clientArea.height - stringExtent.y) / 2;
        e.gc.drawString(buttonText, x, y);
    });
    customButton.addMouseListener(MouseListener.mouseDownAdapter(e -> {
        int actionIndex = (e.button == 1) ? 0 : 1;
        customButtonAction(actionIndex);
    }));
    customButton.addKeyListener(new KeyAdapter() {
        @Override
        public void keyPressed(KeyEvent e) {
            int modifierKeys = e.stateMask & SWT.MODIFIER_MASK;
            if (modifierKeys == SWT.CTRL || modifierKeys == 0) {
                if (e.character == '1')
                    customButtonAction(0);
                else if (e.character == '2')
                    customButtonAction(1);
            }
        }
    });

    Accessible accessible = customButton.getAccessible();
    accessible.addAccessibleListener(new AccessibleAdapter() {
        @Override
        public void getName(AccessibleEvent e) {
            e.result = buttonText;
        }

        @Override
        public void getKeyboardShortcut(AccessibleEvent e) {
            e.result = "CTRL+1"; // default action is 'action 1'
        }
    });
    accessible.addAccessibleControlListener(new AccessibleControlAdapter() {
        @Override
        public void getRole(AccessibleControlEvent e) {
            e.detail = ACC.ROLE_PUSHBUTTON;
        }
    });
    accessible.addAccessibleActionListener(new AccessibleActionAdapter() {
        @Override
        public void getActionCount(AccessibleActionEvent e) {
            e.count = 2;
        }

        @Override
        public void getName(AccessibleActionEvent e) {
            if (0 <= e.index && e.index <= 1) {
                if (e.localized) {
                    e.result = AccessibleActionExample.getResourceString("action" + e.index);
                } else {
                    e.result = "Action" + e.index; //$NON-NLS-1$
                }
            }
        }

        @Override
        public void getDescription(AccessibleActionEvent e) {
            if (0 <= e.index && e.index <= 1) {
                e.result = AccessibleActionExample.getResourceString("action" + e.index + "description");
            }
        }

        @Override
        public void doAction(AccessibleActionEvent e) {
            if (0 <= e.index && e.index <= 1) {
                customButtonAction(e.index);
                e.result = ACC.OK;
            }
        }

        @Override
        public void getKeyBinding(AccessibleActionEvent e) {
            switch (e.index) {
            case 0:
                e.result = "1;CTRL+1";
                break;
            case 1:
                e.result = "2;CTRL+2";
                break;
            default:
                e.result = null;
            }
        }
    });

    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

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