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

Introduction

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

Prototype

public Canvas(Composite parent, int style) 

Source Link

Document

Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.

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 -> {/* w  ww. j  a  v a  2  s .  c  om*/
        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:org.eclipse.swt.snippets.Snippet95.java

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

    final Table table = new Table(shell, SWT.MULTI);
    table.setLinesVisible(true);//from www  .  j a  va  2  s.  c om
    table.setBounds(10, 10, 100, 100);
    for (int i = 0; i < 9; i++) {
        new TableItem(table, SWT.NONE).setText("item" + i);
    }

    Button button = new Button(shell, SWT.PUSH);
    button.setText("Capture");
    button.pack();
    button.setLocation(10, 140);
    button.addListener(SWT.Selection, event -> {
        Point tableSize = table.getSize();
        GC gc = new GC(table);
        final Image image = new Image(display, tableSize.x, tableSize.y);
        gc.copyArea(image, 0, 0);
        gc.dispose();

        Shell popup = new Shell(shell);
        popup.setText("Image");
        popup.addListener(SWT.Close, e -> image.dispose());

        Canvas canvas = new Canvas(popup, SWT.NONE);
        canvas.setBounds(10, 10, tableSize.x + 10, tableSize.y + 10);
        canvas.addPaintListener(e -> e.gc.drawImage(image, 0, 0));
        popup.pack();
        popup.open();
    });
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

---

From source file:org.eclipse.swt.snippets.Snippet334.java

public static void main(String[] arg) {
    display = new Display();
    shell = new Shell(display);
    shell.setText("Snippet 334");
    shell.setLayout(new GridLayout(2, false));
    Label label = new Label(shell, SWT.NONE);
    label.setText("Test:");
    canvas = new Canvas(shell, SWT.MULTI | SWT.BORDER);
    final Caret caret = new Caret(canvas, SWT.NONE);
    canvas.addPaintListener(e -> {/*from  www .  j  av  a  2 s.  c  om*/
        GC gc = e.gc;
        gc.drawText(text, 10, 10);
        caret.setBounds(10, 10, 2, gc.getFontMetrics().getHeight());
        Rectangle rect = canvas.getClientArea();
        if (canvas.isFocusControl()) {
            gc.drawFocus(rect.x, rect.y, rect.width, rect.height);
        }
    });
    canvas.addTraverseListener(e -> {
        switch (e.detail) {
        case SWT.TRAVERSE_TAB_NEXT:
        case SWT.TRAVERSE_TAB_PREVIOUS:
            e.doit = true; // enable traversal
            break;
        }
    });

    // key listener enables traversal out)
    canvas.addKeyListener(keyPressedAdapter(e -> {
    }));

    canvas.addFocusListener(focusGainedAdapter(event -> canvas.redraw()));
    canvas.addFocusListener(focusLostAdapter(event -> canvas.redraw()));
    canvas.addMouseListener(mouseDownAdapter(e -> canvas.setFocus()));
    Accessible acc = canvas.getAccessible();
    acc.addRelation(ACC.RELATION_LABELLED_BY, label.getAccessible());
    acc.addAccessibleControlListener(new AccessibleControlAdapter() {
        @Override
        public void getRole(AccessibleControlEvent e) {
            e.detail = ACC.ROLE_TEXT;
        }

        @Override
        public void getLocation(AccessibleControlEvent e) {
            Rectangle rect = canvas.getBounds();
            Point pt = shell.toDisplay(rect.x, rect.y);
            e.x = pt.x;
            e.y = pt.y;
            e.width = rect.width;
            e.height = rect.height;
        }

        @Override
        public void getValue(AccessibleControlEvent e) {
            e.result = text;
        }

        @Override
        public void getFocus(AccessibleControlEvent e) {
            e.childID = ACC.CHILDID_SELF;
        }

        @Override
        public void getChildCount(AccessibleControlEvent e) {
            e.detail = 0;
        }

        @Override
        public void getState(AccessibleControlEvent e) {
            e.detail = ACC.STATE_NORMAL | ACC.STATE_FOCUSABLE;
            if (canvas.isFocusControl())
                e.detail |= ACC.STATE_FOCUSED | ACC.STATE_SELECTABLE;
        }
    });
    acc.addAccessibleTextListener(new AccessibleTextExtendedAdapter() {
        @Override
        public void getSelectionRange(AccessibleTextEvent e) {
            // select the first 4 characters for testing
            e.offset = 0;
            e.length = 4;
        }

        @Override
        public void getCaretOffset(AccessibleTextEvent e) {
            e.offset = 0;
        }

        @Override
        public void getTextBounds(AccessibleTextEvent e) {
            // for now, assume that start = 0 and end = text.length
            GC gc = new GC(canvas);
            Point extent = gc.textExtent(text);
            gc.dispose();
            Rectangle rect = display.map(canvas, null, 10, 10, extent.x, extent.y);
            e.x = rect.x;
            e.y = rect.y;
            e.width = rect.width;
            e.height = rect.height;
        }

        @Override
        public void getText(AccessibleTextEvent e) {
            int start = 0, end = text.length();
            switch (e.type) {
            case ACC.TEXT_BOUNDARY_ALL:
                start = e.start;
                end = e.end;
                break;
            case ACC.TEXT_BOUNDARY_CHAR:
                start = e.count >= 0 ? e.start + e.count : e.start - e.count;
                start = Math.max(0, Math.min(end, start));
                end = start;
                e.count = start - e.start;
                e.start = start;
                e.end = start;
                break;
            case ACC.TEXT_BOUNDARY_LINE:
                int offset = e.count <= 0 ? e.start : e.end;
                offset = Math.min(offset, text.length());
                int lineCount = 0;
                int index = 0;
                while (index != -1) {
                    lineCount++;
                    index = text.indexOf("\n", index);
                    if (index != -1)
                        index++;
                }
                e.count = e.count < 0 ? Math.max(e.count, -lineCount) : Math.min(e.count, lineCount);
                index = 0;
                int lastIndex = 0;
                String[] lines = new String[lineCount];
                for (int i = 0; i < lines.length; i++) {
                    index = text.indexOf("\n", index);
                    lines[i] = index != -1 ? text.substring(lastIndex, index) : text.substring(lastIndex);
                    lastIndex = index;
                    index++;
                }
                int len = 0;
                int lineAtOffset = 0;
                for (int i = 0; i < lines.length; i++) {
                    len += lines[i].length();
                    if (len >= e.offset) {
                        lineAtOffset = i;
                        break;
                    }
                }
                int result = Math.max(0, Math.min(lineCount - 1, lineAtOffset + e.count));
                e.count = result - lineAtOffset;
                e.result = lines[result];
                break;
            }
            e.result = text.substring(start, end);
        }

        @Override
        public void getSelectionCount(AccessibleTextEvent e) {
            e.count = 1;
        }

        @Override
        public void getSelection(AccessibleTextEvent e) {
            // there is only 1 selection, so index = 0
            getSelectionRange(e);
            e.start = e.offset;
            e.end = e.offset + e.length;
        }

        @Override
        public void getRanges(AccessibleTextEvent e) {
            // for now, ignore bounding box
            e.start = 0;
            e.end = text.length() - 1;
        }

        @Override
        public void getCharacterCount(AccessibleTextEvent e) {
            e.count = text.length();
        }

        @Override
        public void getVisibleRanges(AccessibleTextEvent e) {
            e.start = 0;
            e.end = text.length() - 1;
        }
    });
    Button button = new Button(shell, SWT.PUSH);
    button.setText("Button");
    button.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 2, 1));
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    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  ww  w  .ja va  2 s  .  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.com
    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:ScreenshotCaptureGC.java

public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);

    Button button = new Button(shell, SWT.PUSH);
    button.setText("Capture");
    button.pack();//from   w w  w  .  j  a  v a  2  s  . c  om
    button.setLocation(10, 140);
    button.addListener(SWT.Selection, new Listener() {
        public void handleEvent(Event event) {
            GC gc = new GC(display);
            final Image image = new Image(display, 400, 400);
            gc.copyArea(image, 0, 0);
            gc.dispose();

            Shell popup = new Shell(shell);
            popup.setText("Image");
            popup.addListener(SWT.Close, new Listener() {
                public void handleEvent(Event e) {
                    image.dispose();
                }
            });

            Canvas canvas = new Canvas(popup, SWT.NONE);
            canvas.setBounds(10, 10, 400 + 10, 400 + 10);
            canvas.addPaintListener(new PaintListener() {
                public void paintControl(PaintEvent e) {
                    e.gc.drawImage(image, 0, 0);
                }
            });
            popup.pack();
            popup.open();
        }
    });
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

---

From source file:Snippet95.java

public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("Widget");
    shell.setBounds(10, 10, 200, 200);//from  w w  w.  ja va 2s .  co  m

    final Table table = new Table(shell, SWT.MULTI);
    table.setLinesVisible(true);
    table.setBounds(10, 10, 100, 100);
    for (int i = 0; i < 9; i++) {
        new TableItem(table, SWT.NONE).setText("item" + i);
    }

    Button button = new Button(shell, SWT.PUSH);
    button.setText("Capture");
    button.setBounds(10, 140, 50, 20);
    button.addListener(SWT.Selection, new Listener() {
        public void handleEvent(Event event) {
            Point tableSize = table.getSize();
            GC gc = new GC(table);
            final Image image = new Image(display, tableSize.x, tableSize.y);
            gc.copyArea(image, 0, 0);
            gc.dispose();

            Shell popup = new Shell(shell);
            popup.setText("Image");
            popup.setBounds(50, 50, 200, 200);
            popup.addListener(SWT.Close, new Listener() {
                public void handleEvent(Event e) {
                    image.dispose();
                }
            });

            Canvas canvas = new Canvas(popup, SWT.NONE);
            canvas.setBounds(10, 10, 150, 150);
            canvas.addPaintListener(new PaintListener() {
                public void paintControl(PaintEvent e) {
                    e.gc.drawImage(image, 0, 0);
                }
            });
            popup.open();
        }
    });

    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    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 w w w  .jav a 2s.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, 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:ScreenShotWithGC.java

public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    Button button = new Button(shell, SWT.PUSH);
    button.setText("Capture");
    button.addListener(SWT.Selection, new Listener() {
        public void handleEvent(Event event) {

            /* Take the screen shot */
            GC gc = new GC(display);
            final Image image = new Image(display, display.getBounds());
            gc.copyArea(image, 0, 0);/*  w  w w. j  a  v a  2 s . c o m*/
            gc.dispose();

            Shell popup = new Shell(shell, SWT.SHELL_TRIM);
            popup.setLayout(new FillLayout());
            popup.setText("Image");
            popup.setBounds(50, 50, 200, 200);
            popup.addListener(SWT.Close, new Listener() {
                public void handleEvent(Event e) {
                    image.dispose();
                }
            });

            ScrolledComposite sc = new ScrolledComposite(popup, SWT.V_SCROLL | SWT.H_SCROLL);
            Canvas canvas = new Canvas(sc, SWT.NONE);
            sc.setContent(canvas);
            canvas.setBounds(display.getBounds());
            canvas.addPaintListener(new PaintListener() {
                public void paintControl(PaintEvent e) {
                    e.gc.drawImage(image, 0, 0);
                }
            });
            popup.open();
        }
    });
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

---

From source file:CaptureWidgetImageGC.java

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

    final Table table = new Table(shell, SWT.MULTI);
    table.setLinesVisible(true);//from w  ww . jav  a  2s.  c om
    table.setBounds(10, 10, 100, 100);
    for (int i = 0; i < 9; i++) {
        new TableItem(table, SWT.NONE).setText("item" + i);
    }

    Button button = new Button(shell, SWT.PUSH);
    button.setText("Capture");
    button.pack();
    button.setLocation(10, 140);
    button.addListener(SWT.Selection, new Listener() {
        public void handleEvent(Event event) {
            Point tableSize = table.getSize();
            GC gc = new GC(table);
            final Image image = new Image(display, tableSize.x, tableSize.y);
            gc.copyArea(image, 0, 0);
            gc.dispose();

            Shell popup = new Shell(shell);
            popup.setText("Image");
            popup.addListener(SWT.Close, new Listener() {
                public void handleEvent(Event e) {
                    image.dispose();
                }
            });

            Canvas canvas = new Canvas(popup, SWT.NONE);
            canvas.setBounds(10, 10, tableSize.x + 10, tableSize.y + 10);
            canvas.addPaintListener(new PaintListener() {
                public void paintControl(PaintEvent e) {
                    e.gc.drawImage(image, 0, 0);
                }
            });
            popup.pack();
            popup.open();
        }
    });
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• »