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

List of usage examples for org.eclipse.swt.widgets Canvas redraw

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  6. redraw

Introduction

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

Prototype

public void redraw()

Source Link

Document

Causes the entire bounds of the receiver to be marked as needing to be redrawn.

Usage

From source file:MainClass.java

public static void main(String[] a) {

    final Display d = new Display();
    final Shell shell = new Shell(d);

    shell.setSize(250, 200);/*  w  w w . ja v  a  2s.c o m*/

    shell.setLayout(new FillLayout());

    Canvas drawingCanvas = new Canvas(shell, SWT.NONE);
    drawingCanvas.addPaintListener(new ArcExamplePaintListener());
    drawingCanvas.redraw();

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

From source file:DrawOval.java

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

    Canvas canvas = new Canvas(shell, SWT.NONE);

    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            e.gc.drawOval(200, 100, 500, 400);
        }/*  w  ww.jav  a2 s .c  o m*/
    });

    canvas.redraw();

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

From source file:CanvasRepaint.java

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

    Canvas canvas = new Canvas(shell, SWT.NONE);

    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            e.gc.drawRoundRectangle(10, 10, 200, 200, 30, 30);
        }//w ww .  ja  v a  2  s . c  om
    });

    canvas.redraw();

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

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   w  ww  .  j  a  v  a 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();
}

From source file:FontSizeString.java

public static void main(String[] a) {
    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("Extents");

    final Canvas canvas = new Canvas(shell, SWT.NONE);

    shell.addControlListener(new ControlAdapter() {
        public void controlResized(ControlEvent event) {
            canvas.setBounds(shell.getClientArea());
        }/*from   w w w  .  j a  va  2  s  .c o  m*/
    });
    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent event) {
            event.gc.setFont(font);
            Point pt = event.gc.stringExtent(STRING);

            System.out.println(pt);
        }
    });

    // Create an editor to house the dropdown
    ControlEditor editor = new ControlEditor(canvas);

    // Create the combo and fill it
    final Combo combo = new Combo(canvas, SWT.READ_ONLY);
    for (int i = 0, n = SIZES.length; i < n; i++) {
        combo.add(SIZES[i]);
    }

    // Set up the editor
    editor.horizontalAlignment = SWT.CENTER;
    editor.verticalAlignment = SWT.TOP;
    Point size = combo.computeSize(SWT.DEFAULT, SWT.DEFAULT);
    editor.minimumWidth = size.x;
    editor.minimumHeight = size.y;
    editor.setEditor(combo);

    combo.addSelectionListener(new SelectionAdapter() {
        public void widgetSelected(SelectionEvent event) {
            if (font != null)
                font.dispose();
            font = new Font(shell.getDisplay(), "Helvetica", new Integer(combo.getText()).intValue(), SWT.BOLD);
            canvas.redraw();
        }
    });

    // Select the first item in the combo
    combo.select(0);

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

From source file:org.eclipse.swt.snippets.Snippet338.java

public static void main(String[] args) {
    Display display = new Display();
    Shell parentShell = new Shell(display);
    parentShell.setText("Snippet 338");
    parentShell.setBounds(10, 10, 100, 100);
    parentShell.open();/*from   www  .j  a  v  a  2s.  c  om*/

    Shell childShell = new Shell(parentShell);
    childShell.setLayout(new GridLayout());
    TabFolder folder = new TabFolder(childShell, SWT.NONE);
    folder.setLayout(new FillLayout());
    TabItem tab1 = new TabItem(folder, SWT.NONE);
    tab1.setText("Tab &1");
    new TabItem(folder, SWT.NONE).setText("Tab &2");
    Composite composite = new Composite(folder, SWT.NONE);
    composite.setLayout(new GridLayout());
    tab1.setControl(composite);
    Text text1 = new Text(composite, SWT.SINGLE);

    /* canvas represents a custom control */
    final Canvas canvas = new Canvas(composite, SWT.BORDER);
    canvas.setLayoutData(new GridData(300, 200));
    canvas.addListener(SWT.Paint, event -> {
        if (canvas.isFocusControl()) {
            event.gc.drawText(
                    "focus is here, custom traverse keys:\n\tN: Tab next\n\tP: Tab previous\n\tR: Return\n\tE: Esc\n\tT: Tab Folder next page",
                    0, 0);
        } else {
            event.gc.drawString("focus is not in this control", 0, 0);
        }
    });
    canvas.addListener(SWT.KeyDown, event -> {
        int traversal = SWT.NONE;
        switch (event.keyCode) {
        case 'n':
            traversal = SWT.TRAVERSE_TAB_NEXT;
            break;
        case 'p':
            traversal = SWT.TRAVERSE_TAB_PREVIOUS;
            break;
        case 'r':
            traversal = SWT.TRAVERSE_RETURN;
            break;
        case 'e':
            traversal = SWT.TRAVERSE_ESCAPE;
            break;
        case 't':
            traversal = SWT.TRAVERSE_PAGE_NEXT;
            break;
        }
        if (traversal != SWT.NONE) {
            event.doit = true; /* this will be the Traverse event's initial doit value */
            canvas.traverse(traversal, event);
        }
    });
    canvas.addFocusListener(focusLostAdapter(e -> canvas.redraw()));
    canvas.addFocusListener(focusGainedAdapter(e -> canvas.redraw()));

    Text text2 = new Text(composite, SWT.SINGLE);
    Button button = new Button(childShell, SWT.PUSH);
    button.setText("Default &Button");
    button.addListener(SWT.Selection, event -> System.out.println("Default button selected"));
    childShell.setDefaultButton(button);

    Listener printTraverseListener = event -> {
        StringBuilder buffer = new StringBuilder("Traverse ");
        buffer.append(event.widget);
        buffer.append(" type=");
        switch (event.detail) {
        case SWT.TRAVERSE_ARROW_NEXT:
            buffer.append("TRAVERSE_ARROW_NEXT");
            break;
        case SWT.TRAVERSE_ARROW_PREVIOUS:
            buffer.append("TRAVERSE_ARROW_NEXT");
            break;
        case SWT.TRAVERSE_ESCAPE:
            buffer.append("TRAVERSE_ESCAPE");
            break;
        case SWT.TRAVERSE_MNEMONIC:
            buffer.append("TRAVERSE_MNEMONIC");
            break;
        case SWT.TRAVERSE_PAGE_NEXT:
            buffer.append("TRAVERSE_PAGE_NEXT");
            break;
        case SWT.TRAVERSE_PAGE_PREVIOUS:
            buffer.append("TRAVERSE_PAGE_PREVIOUS");
            break;
        case SWT.TRAVERSE_RETURN:
            buffer.append("TRAVERSE_RETURN");
            break;
        case SWT.TRAVERSE_TAB_NEXT:
            buffer.append("TRAVERSE_TAB_NEXT");
            break;
        case SWT.TRAVERSE_TAB_PREVIOUS:
            buffer.append("TRAVERSE_TAB_PREVIOUS");
            break;
        }
        buffer.append(" doit=" + event.doit);
        buffer.append(" keycode=" + event.keyCode);
        buffer.append(" char=" + event.character);
        buffer.append(" stateMask=" + event.stateMask);
        System.out.println(buffer.toString());
    };
    childShell.addListener(SWT.Traverse, printTraverseListener);
    folder.addListener(SWT.Traverse, printTraverseListener);
    composite.addListener(SWT.Traverse, printTraverseListener);
    canvas.addListener(SWT.Traverse, printTraverseListener);
    button.addListener(SWT.Traverse, printTraverseListener);
    text1.addListener(SWT.Traverse, printTraverseListener);
    text2.addListener(SWT.Traverse, printTraverseListener);

    childShell.pack();
    childShell.open();
    text1.setFocus();
    while (!parentShell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

From source file:org.eclipse.swt.snippets.Snippet48.java

public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Snippet 48");
    shell.setLayout(new FillLayout());
    Image originalImage = null;//from  w w w  . ja  v a  2  s .  co m
    FileDialog dialog = new FileDialog(shell, SWT.OPEN);
    dialog.setText("Open an image file or cancel");
    String string = dialog.open();
    if (string != null) {
        originalImage = new Image(display, string);
    }
    if (originalImage == null) {
        int width = 150, height = 200;
        originalImage = new Image(display, width, height);
        GC gc = new GC(originalImage);
        gc.fillRectangle(0, 0, width, height);
        gc.drawLine(0, 0, width, height);
        gc.drawLine(0, height, width, 0);
        gc.drawText("Default Image", 10, 10);
        gc.dispose();
    }
    final Image image = originalImage;
    final Point origin = new Point(0, 0);
    final Canvas canvas = new Canvas(shell,
            SWT.NO_BACKGROUND | SWT.NO_REDRAW_RESIZE | SWT.V_SCROLL | SWT.H_SCROLL);
    final ScrollBar hBar = canvas.getHorizontalBar();
    hBar.addListener(SWT.Selection, e -> {
        int hSelection = hBar.getSelection();
        int destX = -hSelection - origin.x;
        Rectangle rect = image.getBounds();
        canvas.scroll(destX, 0, 0, 0, rect.width, rect.height, false);
        origin.x = -hSelection;
    });
    final ScrollBar vBar = canvas.getVerticalBar();
    vBar.addListener(SWT.Selection, e -> {
        int vSelection = vBar.getSelection();
        int destY = -vSelection - origin.y;
        Rectangle rect = image.getBounds();
        canvas.scroll(0, destY, 0, 0, rect.width, rect.height, false);
        origin.y = -vSelection;
    });
    canvas.addListener(SWT.Resize, e -> {
        Rectangle rect = image.getBounds();
        Rectangle client = canvas.getClientArea();
        hBar.setMaximum(rect.width);
        vBar.setMaximum(rect.height);
        hBar.setThumb(Math.min(rect.width, client.width));
        vBar.setThumb(Math.min(rect.height, client.height));
        int hPage = rect.width - client.width;
        int vPage = rect.height - client.height;
        int hSelection = hBar.getSelection();
        int vSelection = vBar.getSelection();
        if (hSelection >= hPage) {
            if (hPage <= 0)
                hSelection = 0;
            origin.x = -hSelection;
        }
        if (vSelection >= vPage) {
            if (vPage <= 0)
                vSelection = 0;
            origin.y = -vSelection;
        }
        canvas.redraw();
    });
    canvas.addListener(SWT.Paint, e -> {
        GC gc = e.gc;
        gc.drawImage(image, origin.x, origin.y);
        Rectangle rect = image.getBounds();
        Rectangle client = canvas.getClientArea();
        int marginWidth = client.width - rect.width;
        if (marginWidth > 0) {
            gc.fillRectangle(rect.width, 0, marginWidth, client.height);
        }
        int marginHeight = client.height - rect.height;
        if (marginHeight > 0) {
            gc.fillRectangle(0, rect.height, client.width, marginHeight);
        }
    });
    Rectangle rect = image.getBounds();
    shell.setSize(Math.max(200, rect.width - 100), Math.max(150, rect.height - 100));
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    originalImage.dispose();
    display.dispose();
}

From source file:ImageScrollFlickerFree.java

public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    Image originalImage = null;//from   ww w  .  j  ava 2s  .  c o  m
    FileDialog dialog = new FileDialog(shell, SWT.OPEN);
    dialog.setText("Open an image file or cancel");
    String string = dialog.open();
    if (string != null) {
        originalImage = new Image(display, string);
    }
    if (originalImage == null) {
        int width = 150, height = 200;
        originalImage = new Image(display, width, height);
        GC gc = new GC(originalImage);
        gc.fillRectangle(0, 0, width, height);
        gc.drawLine(0, 0, width, height);
        gc.drawLine(0, height, width, 0);
        gc.drawText("Default Image", 10, 10);
        gc.dispose();
    }
    final Image image = originalImage;
    final Point origin = new Point(0, 0);
    final Canvas canvas = new Canvas(shell,
            SWT.NO_BACKGROUND | SWT.NO_REDRAW_RESIZE | SWT.V_SCROLL | SWT.H_SCROLL);
    final ScrollBar hBar = canvas.getHorizontalBar();
    hBar.addListener(SWT.Selection, new Listener() {
        public void handleEvent(Event e) {
            int hSelection = hBar.getSelection();
            int destX = -hSelection - origin.x;
            Rectangle rect = image.getBounds();
            canvas.scroll(destX, 0, 0, 0, rect.width, rect.height, false);
            origin.x = -hSelection;
        }
    });
    final ScrollBar vBar = canvas.getVerticalBar();
    vBar.addListener(SWT.Selection, new Listener() {
        public void handleEvent(Event e) {
            int vSelection = vBar.getSelection();
            int destY = -vSelection - origin.y;
            Rectangle rect = image.getBounds();
            canvas.scroll(0, destY, 0, 0, rect.width, rect.height, false);
            origin.y = -vSelection;
        }
    });
    canvas.addListener(SWT.Resize, new Listener() {
        public void handleEvent(Event e) {
            Rectangle rect = image.getBounds();
            Rectangle client = canvas.getClientArea();
            hBar.setMaximum(rect.width);
            vBar.setMaximum(rect.height);
            hBar.setThumb(Math.min(rect.width, client.width));
            vBar.setThumb(Math.min(rect.height, client.height));
            int hPage = rect.width - client.width;
            int vPage = rect.height - client.height;
            int hSelection = hBar.getSelection();
            int vSelection = vBar.getSelection();
            if (hSelection >= hPage) {
                if (hPage <= 0)
                    hSelection = 0;
                origin.x = -hSelection;
            }
            if (vSelection >= vPage) {
                if (vPage <= 0)
                    vSelection = 0;
                origin.y = -vSelection;
            }
            canvas.redraw();
        }
    });
    canvas.addListener(SWT.Paint, new Listener() {
        public void handleEvent(Event e) {
            GC gc = e.gc;
            gc.drawImage(image, origin.x, origin.y);
            Rectangle rect = image.getBounds();
            Rectangle client = canvas.getClientArea();
            int marginWidth = client.width - rect.width;
            if (marginWidth > 0) {
                gc.fillRectangle(rect.width, 0, marginWidth, client.height);
            }
            int marginHeight = client.height - rect.height;
            if (marginHeight > 0) {
                gc.fillRectangle(0, rect.height, client.width, marginHeight);
            }
        }
    });
    shell.setSize(200, 150);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    originalImage.dispose();
    display.dispose();
}

From source file:RoundRectangleExample.java

/**
 * Creates the main window's contents// ww w  .ja  v a  2 s  . c o  m
 * 
 * @param shell the main window
 */
private void createContents(Shell shell) {
    shell.setLayout(new FillLayout(SWT.VERTICAL));

    // Create the composite that holds the input fields
    Composite widgetComposite = new Composite(shell, SWT.NONE);
    widgetComposite.setLayout(new GridLayout(2, false));

    // Create the input fields
    new Label(widgetComposite, SWT.NONE).setText("Arc Width:");
    txtArcWidth = new Text(widgetComposite, SWT.BORDER);

    new Label(widgetComposite, SWT.NONE).setText("Arc Height");
    txtArcHeight = new Text(widgetComposite, SWT.BORDER);

    // Create the button that launches the redraw
    Button button = new Button(widgetComposite, SWT.PUSH);
    button.setText("Redraw");
    shell.setDefaultButton(button);

    // Create the canvas to draw the round rectangle on
    final Canvas drawingCanvas = new Canvas(shell, SWT.NONE);
    drawingCanvas.addPaintListener(new RoundRectangleExamplePaintListener());

    // Add a handler to redraw the round rectangle when pressed
    button.addSelectionListener(new SelectionAdapter() {
        public void widgetSelected(SelectionEvent e) {
            drawingCanvas.redraw();
        }
    });
}

From source file:Animations.java

public Animations() {
    shell.setLayout(new FillLayout());

    ImageLoader imageLoader = new ImageLoader();
    final ImageData[] imageDatas = imageLoader.load("java2s.gif");

    final Image image = new Image(display, imageDatas[0].width, imageDatas[0].height);
    final Canvas canvas = new Canvas(shell, SWT.NULL);

    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            e.gc.drawImage(image, 0, 0);
        }/*w w  w .  ja v  a 2s. c  o m*/
    });

    final GC gc = new GC(image);

    final Thread thread = new Thread() {
        int frameIndex = 0;

        public void run() {
            while (!isInterrupted()) {
                frameIndex %= imageDatas.length;

                final ImageData frameData = imageDatas[frameIndex];
                display.asyncExec(new Runnable() {
                    public void run() {
                        Image frame = new Image(display, frameData);
                        gc.drawImage(frame, frameData.x, frameData.y);
                        frame.dispose();
                        canvas.redraw();
                    }
                });

                try {
                    // delay
                    Thread.sleep(imageDatas[frameIndex].delayTime * 10);
                } catch (InterruptedException e) {
                    return;
                }

                frameIndex += 1;
            }

        }
    };

    shell.addShellListener(new ShellAdapter() {
        public void shellClosed(ShellEvent e) {
            thread.interrupt();
        }
    });

    shell.setSize(400, 200);
    shell.open();

    thread.start();

    // Set up the event loop.
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) {
            // If no more entries in event queue
            display.sleep();
        }
    }

    display.dispose();
}