Examples with Canvas org.eclipse.swt.widgets.Canvas used on opensource projects

Example 16 with Canvas

use of org.eclipse.swt.widgets.Canvas in project linuxtools by eclipse.

the class CallgraphView method initializeView.

/**
 * Initializes the view by creating composites (if necessary) and canvases
 * Calls loadData(), and calls finishLoad() if not in realTime mode (otherwise
 * it is up to the user-defined update methods to finish loading).
 *
 * @return status
 */
@Override
public IStatus initializeView(Display targetDisplay, IProgressMonitor monitor) {
    if (targetDisplay == null && Display.getCurrent() == null) {
        Display.getDefault();
    }
    makeTreeComp();
    makeGraphComp();
    graphComp.setBackgroundMode(SWT.INHERIT_FORCE);
    // Create papa canvas
    Canvas papaCanvas = new Canvas(graphComp, SWT.BORDER);
    GridLayout papaLayout = new GridLayout(1, true);
    papaLayout.horizontalSpacing = 0;
    papaLayout.verticalSpacing = 0;
    papaLayout.marginHeight = 0;
    papaLayout.marginWidth = 0;
    papaCanvas.setLayout(papaLayout);
    GridData papaGD = new GridData(SWT.BEGINNING, SWT.BEGINNING, false, false);
    papaGD.widthHint = 160;
    papaCanvas.setLayoutData(papaGD);
    // Add first button
    // $NON-NLS-1$
    Image image = getImageDescriptor("icons/up.gif").createImage();
    Button up = new Button(papaCanvas, SWT.PUSH);
    GridData buttonData = new GridData(SWT.CENTER, SWT.CENTER, true, false);
    buttonData.widthHint = 150;
    buttonData.heightHint = 20;
    up.setData(buttonData);
    up.setImage(image);
    // $NON-NLS-1$
    up.setToolTipText(Messages.getString("CallgraphView.ThumbNailUp"));
    // Add thumb canvas
    Canvas thumbCanvas = new Canvas(papaCanvas, SWT.NONE);
    // Add second button
    // $NON-NLS-1$
    image = getImageDescriptor("icons/down.gif").createImage();
    Button down = new Button(papaCanvas, SWT.PUSH);
    buttonData = new GridData(SWT.CENTER, SWT.CENTER, true, false);
    buttonData.widthHint = 150;
    buttonData.heightHint = 0;
    down.setData(buttonData);
    down.setImage(image);
    // $NON-NLS-1$
    down.setToolTipText(Messages.getString("CallgraphView.ThumbNailDown"));
    // Initialize graph
    g = new StapGraph(graphComp, SWT.BORDER, treeComp, papaCanvas, this);
    g.setLayoutData(new GridData(masterComposite.getBounds().width, Display.getCurrent().getBounds().height - TREE_SIZE));
    up.addSelectionListener(new AutoScrollSelectionListener(AutoScrollSelectionListener.AUTO_SCROLL_UP, g));
    down.addSelectionListener(new AutoScrollSelectionListener(AutoScrollSelectionListener.AUTO_SCROLL_DOWN, g));
    // Initialize thumbnail
    GridData thumbGD = new GridData(SWT.BEGINNING, SWT.BEGINNING, false, false);
    thumbGD.widthHint = 160;
    thumbCanvas.setLayoutData(thumbGD);
    LightweightSystem lws = new LightweightSystem(thumbCanvas);
    ScrollableThumbnail thumb = new ScrollableThumbnail(g.getViewport());
    thumb.setSource(g.getContents());
    lws.setContents(thumb);
    loadData(monitor);
    return finishLoad(monitor);
}

Example 17 with Canvas

use of org.eclipse.swt.widgets.Canvas in project knime-core by knime.

the class NewOverviewOutlinePage method createControl.

/**
 * {@inheritDoc}
 */
@Override
public void createControl(final Composite parent) {
    // create canvas and lws
    m_overview = new Canvas(parent, SWT.NONE);
    LightweightSystem lws = new LightweightSystem(m_overview);
    // create thumbnail
    m_thumbnail = new ScrollableThumbnail((Viewport) m_rootEditPart.getFigure());
    m_thumbnail.setBorder(new MarginBorder(3));
    m_thumbnail.setSource(m_rootEditPart.getLayer(LayerConstants.PRINTABLE_LAYERS));
    lws.setContents(m_thumbnail);
}

Example 18 with Canvas

use of org.eclipse.swt.widgets.Canvas in project eclipse.platform.swt by eclipse.

the class ImageAnalyzer method createWidgets.

void createWidgets() {
    // Add the widgets to the shell in a grid layout.
    GridLayout layout = new GridLayout();
    layout.marginHeight = 0;
    layout.numColumns = 2;
    shell.setLayout(layout);
    // Add a composite to contain some control widgets across the top.
    Composite controls = new Composite(shell, SWT.NONE);
    RowLayout rowLayout = new RowLayout();
    rowLayout.marginTop = 5;
    rowLayout.marginBottom = 5;
    rowLayout.spacing = 8;
    controls.setLayout(rowLayout);
    GridData gridData = new GridData();
    gridData.horizontalSpan = 2;
    controls.setLayoutData(gridData);
    // Combo to change the background.
    Group group = new Group(controls, SWT.NONE);
    group.setLayout(new RowLayout());
    group.setText(bundle.getString("Background"));
    backgroundCombo = new Combo(group, SWT.DROP_DOWN | SWT.READ_ONLY);
    backgroundCombo.setItems(bundle.getString("None"), bundle.getString("White"), bundle.getString("Black"), bundle.getString("Red"), bundle.getString("Green"), bundle.getString("Blue"));
    backgroundCombo.select(backgroundCombo.indexOf(bundle.getString("White")));
    backgroundCombo.addSelectionListener(widgetSelectedAdapter(event -> changeBackground()));
    // Combo to change the compression ratio.
    group = new Group(controls, SWT.NONE);
    group.setLayout(new GridLayout(3, true));
    group.setText(bundle.getString("Save_group"));
    imageTypeCombo = new Combo(group, SWT.DROP_DOWN | SWT.READ_ONLY);
    String[] types = { "JPEG", "PNG", "GIF", "ICO", "TIFF", "BMP" };
    for (String type : types) {
        imageTypeCombo.add(type);
    }
    imageTypeCombo.select(imageTypeCombo.indexOf("JPEG"));
    imageTypeCombo.addSelectionListener(widgetSelectedAdapter(event -> {
        int index = imageTypeCombo.getSelectionIndex();
        switch(index) {
            case 0:
                compressionCombo.setEnabled(true);
                compressionRatioLabel.setEnabled(true);
                if (compressionCombo.getItemCount() == 100)
                    break;
                compressionCombo.removeAll();
                for (int i = 0; i < 100; i++) {
                    compressionCombo.add(String.valueOf(i + 1));
                }
                compressionCombo.select(compressionCombo.indexOf("75"));
                break;
            case 1:
                compressionCombo.setEnabled(true);
                compressionRatioLabel.setEnabled(true);
                if (compressionCombo.getItemCount() == 10)
                    break;
                compressionCombo.removeAll();
                for (int i = 0; i < 4; i++) {
                    compressionCombo.add(String.valueOf(i));
                }
                compressionCombo.select(0);
                break;
            case 2:
            case 3:
            case 4:
            case 5:
                compressionCombo.setEnabled(false);
                compressionRatioLabel.setEnabled(false);
                break;
        }
    }));
    imageTypeCombo.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
    compressionRatioLabel = new Label(group, SWT.NONE);
    compressionRatioLabel.setText(bundle.getString("Compression"));
    compressionRatioLabel.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, false, false));
    compressionCombo = new Combo(group, SWT.DROP_DOWN | SWT.READ_ONLY);
    for (int i = 0; i < 100; i++) {
        compressionCombo.add(String.valueOf(i + 1));
    }
    compressionCombo.select(compressionCombo.indexOf("75"));
    compressionCombo.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
    // Combo to change the x scale.
    String[] values = { "0.1", "0.2", "0.3", "0.4", "0.5", "0.6", "0.7", "0.8", "0.9", "1", "1.1", "1.2", "1.3", "1.4", "1.5", "1.6", "1.7", "1.8", "1.9", "2", "3", "4", "5", "6", "7", "8", "9", "10" };
    group = new Group(controls, SWT.NONE);
    group.setLayout(new RowLayout());
    group.setText(bundle.getString("X_scale"));
    scaleXCombo = new Combo(group, SWT.DROP_DOWN);
    for (String value : values) {
        scaleXCombo.add(value);
    }
    scaleXCombo.select(scaleXCombo.indexOf("1"));
    scaleXCombo.addSelectionListener(widgetSelectedAdapter(event -> scaleX()));
    // Combo to change the y scale.
    group = new Group(controls, SWT.NONE);
    group.setLayout(new RowLayout());
    group.setText(bundle.getString("Y_scale"));
    scaleYCombo = new Combo(group, SWT.DROP_DOWN);
    for (String value : values) {
        scaleYCombo.add(value);
    }
    scaleYCombo.select(scaleYCombo.indexOf("1"));
    scaleYCombo.addSelectionListener(widgetSelectedAdapter(event -> scaleY()));
    // Combo to change the alpha value.
    group = new Group(controls, SWT.NONE);
    group.setLayout(new RowLayout());
    group.setText(bundle.getString("Alpha_K"));
    alphaCombo = new Combo(group, SWT.DROP_DOWN | SWT.READ_ONLY);
    for (int i = 0; i <= 255; i += 5) {
        alphaCombo.add(String.valueOf(i));
    }
    alphaCombo.select(alphaCombo.indexOf("255"));
    alphaCombo.addSelectionListener(widgetSelectedAdapter(event -> alpha()));
    // Check box to request incremental display.
    group = new Group(controls, SWT.NONE);
    group.setLayout(new RowLayout());
    group.setText(bundle.getString("Display"));
    incrementalCheck = new Button(group, SWT.CHECK);
    incrementalCheck.setText(bundle.getString("Incremental"));
    incrementalCheck.setSelection(incremental);
    incrementalCheck.addSelectionListener(widgetSelectedAdapter(event -> incremental = ((Button) event.widget).getSelection()));
    // Check box to request transparent display.
    transparentCheck = new Button(group, SWT.CHECK);
    transparentCheck.setText(bundle.getString("Transparent"));
    transparentCheck.setSelection(transparent);
    transparentCheck.addSelectionListener(widgetSelectedAdapter(event -> {
        transparent = ((Button) event.widget).getSelection();
        if (image != null) {
            imageCanvas.redraw();
        }
    }));
    // Check box to request mask display.
    maskCheck = new Button(group, SWT.CHECK);
    maskCheck.setText(bundle.getString("Mask"));
    maskCheck.setSelection(showMask);
    maskCheck.addSelectionListener(widgetSelectedAdapter(event -> {
        showMask = ((Button) event.widget).getSelection();
        if (image != null) {
            imageCanvas.redraw();
        }
    }));
    // Check box to request background display.
    backgroundCheck = new Button(group, SWT.CHECK);
    backgroundCheck.setText(bundle.getString("Background"));
    backgroundCheck.setSelection(showBackground);
    backgroundCheck.addSelectionListener(widgetSelectedAdapter(event -> showBackground = ((Button) event.widget).getSelection()));
    // Group the animation buttons.
    group = new Group(controls, SWT.NONE);
    group.setLayout(new RowLayout());
    group.setText(bundle.getString("Animation"));
    // Push button to display the previous image in a multi-image file.
    previousButton = new Button(group, SWT.PUSH);
    previousButton.setText(bundle.getString("Previous"));
    previousButton.setEnabled(false);
    previousButton.addSelectionListener(widgetSelectedAdapter(event -> previous()));
    // Push button to display the next image in a multi-image file.
    nextButton = new Button(group, SWT.PUSH);
    nextButton.setText(bundle.getString("Next"));
    nextButton.setEnabled(false);
    nextButton.addSelectionListener(widgetSelectedAdapter(event -> next()));
    // Push button to toggle animation of a multi-image file.
    animateButton = new Button(group, SWT.PUSH);
    animateButton.setText(bundle.getString("Animate"));
    animateButton.setEnabled(false);
    animateButton.addSelectionListener(widgetSelectedAdapter(event -> animate()));
    // Label to show the image file type.
    typeLabel = new Label(shell, SWT.NONE);
    typeLabel.setText(bundle.getString("Type_initial"));
    typeLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    // Canvas to show the image.
    imageCanvas = new Canvas(shell, SWT.V_SCROLL | SWT.H_SCROLL | SWT.NO_REDRAW_RESIZE | SWT.NO_BACKGROUND);
    imageCanvas.setBackground(whiteColor);
    imageCanvas.setCursor(crossCursor);
    gridData = new GridData();
    gridData.verticalSpan = 15;
    gridData.horizontalAlignment = GridData.FILL;
    gridData.verticalAlignment = GridData.FILL;
    gridData.grabExcessHorizontalSpace = true;
    gridData.grabExcessVerticalSpace = true;
    imageCanvas.setLayoutData(gridData);
    imageCanvas.addPaintListener(event -> {
        if (image == null) {
            Rectangle bounds = imageCanvas.getBounds();
            event.gc.fillRectangle(0, 0, bounds.width, bounds.height);
        } else {
            paintImage(event);
        }
    });
    imageCanvas.addMouseMoveListener(event -> {
        if (image != null) {
            showColorAt(event.x, event.y);
        }
    });
    // Set up the image canvas scroll bars.
    ScrollBar horizontal = imageCanvas.getHorizontalBar();
    horizontal.setVisible(true);
    horizontal.setMinimum(0);
    horizontal.setEnabled(false);
    horizontal.addSelectionListener(widgetSelectedAdapter(event -> scrollHorizontally((ScrollBar) event.widget)));
    ScrollBar vertical = imageCanvas.getVerticalBar();
    vertical.setVisible(true);
    vertical.setMinimum(0);
    vertical.setEnabled(false);
    vertical.addSelectionListener(widgetSelectedAdapter(event -> scrollVertically((ScrollBar) event.widget)));
    // Label to show the image size.
    sizeLabel = new Label(shell, SWT.NONE);
    sizeLabel.setText(bundle.getString("Size_initial"));
    sizeLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    // Label to show the image depth.
    depthLabel = new Label(shell, SWT.NONE);
    depthLabel.setText(bundle.getString("Depth_initial"));
    depthLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    // Label to show the transparent pixel.
    transparentPixelLabel = new Label(shell, SWT.NONE);
    transparentPixelLabel.setText(bundle.getString("Transparent_pixel_initial"));
    transparentPixelLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    // Label to show the time to load.
    timeToLoadLabel = new Label(shell, SWT.NONE);
    timeToLoadLabel.setText(bundle.getString("Time_to_load_initial"));
    timeToLoadLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    // Separate the animation fields from the rest of the fields.
    Label separator = new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL);
    separator.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    // Label to show the logical screen size for animation.
    screenSizeLabel = new Label(shell, SWT.NONE);
    screenSizeLabel.setText(bundle.getString("Animation_size_initial"));
    screenSizeLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    // Label to show the background pixel.
    backgroundPixelLabel = new Label(shell, SWT.NONE);
    backgroundPixelLabel.setText(bundle.getString("Background_pixel_initial"));
    backgroundPixelLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    // Label to show the image location (x, y).
    locationLabel = new Label(shell, SWT.NONE);
    locationLabel.setText(bundle.getString("Image_location_initial"));
    locationLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    // Label to show the image disposal method.
    disposalMethodLabel = new Label(shell, SWT.NONE);
    disposalMethodLabel.setText(bundle.getString("Disposal_initial"));
    disposalMethodLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    // Label to show the image delay time.
    delayTimeLabel = new Label(shell, SWT.NONE);
    delayTimeLabel.setText(bundle.getString("Delay_initial"));
    delayTimeLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    // Label to show the background pixel.
    repeatCountLabel = new Label(shell, SWT.NONE);
    repeatCountLabel.setText(bundle.getString("Repeats_initial"));
    repeatCountLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    // Separate the animation fields from the palette.
    separator = new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL);
    separator.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    // Label to show if the image has a direct or indexed palette.
    paletteLabel = new Label(shell, SWT.NONE);
    paletteLabel.setText(bundle.getString("Palette_initial"));
    paletteLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    // Canvas to show the image's palette.
    paletteCanvas = new Canvas(shell, SWT.BORDER | SWT.V_SCROLL | SWT.NO_REDRAW_RESIZE);
    paletteCanvas.setFont(fixedWidthFont);
    paletteCanvas.getVerticalBar().setVisible(true);
    gridData = new GridData();
    gridData.horizontalAlignment = GridData.FILL;
    gridData.verticalAlignment = GridData.FILL;
    GC gc = new GC(paletteLabel);
    paletteWidth = gc.stringExtent(bundle.getString("Max_length_string")).x;
    gc.dispose();
    gridData.widthHint = paletteWidth;
    // show at least 16 colors
    gridData.heightHint = 16 * 11;
    paletteCanvas.setLayoutData(gridData);
    paletteCanvas.addPaintListener(event -> {
        if (image != null)
            paintPalette(event);
    });
    // Set up the palette canvas scroll bar.
    vertical = paletteCanvas.getVerticalBar();
    vertical.setVisible(true);
    vertical.setMinimum(0);
    vertical.setIncrement(10);
    vertical.setEnabled(false);
    vertical.addSelectionListener(widgetSelectedAdapter(event -> scrollPalette((ScrollBar) event.widget)));
    // Sash to see more of image or image data.
    sash = new Sash(shell, SWT.HORIZONTAL);
    gridData = new GridData();
    gridData.horizontalSpan = 2;
    gridData.horizontalAlignment = GridData.FILL;
    sash.setLayoutData(gridData);
    sash.addSelectionListener(widgetSelectedAdapter(event -> {
        if (event.detail != SWT.DRAG) {
            ((GridData) paletteCanvas.getLayoutData()).heightHint = SWT.DEFAULT;
            Rectangle paletteCanvasBounds = paletteCanvas.getBounds();
            int minY = paletteCanvasBounds.y + 20;
            Rectangle dataLabelBounds = dataLabel.getBounds();
            int maxY = statusLabel.getBounds().y - dataLabelBounds.height - 20;
            if (event.y > minY && event.y < maxY) {
                Rectangle oldSash = sash.getBounds();
                sash.setBounds(event.x, event.y, event.width, event.height);
                int diff = event.y - oldSash.y;
                Rectangle bounds = imageCanvas.getBounds();
                imageCanvas.setBounds(bounds.x, bounds.y, bounds.width, bounds.height + diff);
                bounds = paletteCanvasBounds;
                paletteCanvas.setBounds(bounds.x, bounds.y, bounds.width, bounds.height + diff);
                bounds = dataLabelBounds;
                dataLabel.setBounds(bounds.x, bounds.y + diff, bounds.width, bounds.height);
                bounds = dataText.getBounds();
                dataText.setBounds(bounds.x, bounds.y + diff, bounds.width, bounds.height - diff);
            // shell.layout(true);
            }
        }
    }));
    // Label to show data-specific fields.
    dataLabel = new Label(shell, SWT.NONE);
    dataLabel.setText(bundle.getString("Pixel_data_initial"));
    gridData = new GridData();
    gridData.horizontalSpan = 2;
    gridData.horizontalAlignment = GridData.FILL;
    dataLabel.setLayoutData(gridData);
    // Text to show a dump of the data.
    dataText = new StyledText(shell, SWT.BORDER | SWT.MULTI | SWT.READ_ONLY | SWT.V_SCROLL | SWT.H_SCROLL);
    dataText.setBackground(display.getSystemColor(SWT.COLOR_WIDGET_BACKGROUND));
    dataText.setFont(fixedWidthFont);
    gridData = new GridData();
    gridData.horizontalSpan = 2;
    gridData.horizontalAlignment = GridData.FILL;
    gridData.verticalAlignment = GridData.FILL;
    gridData.heightHint = 128;
    gridData.grabExcessVerticalSpace = true;
    dataText.setLayoutData(gridData);
    dataText.addMouseListener(MouseListener.mouseDownAdapter(event -> {
        if (image != null && event.button == 1) {
            showColorForData();
        }
    }));
    dataText.addKeyListener(new KeyAdapter() {

        @Override
        public void keyPressed(KeyEvent event) {
            if (image != null) {
                showColorForData();
            }
        }
    });
    // Label to show status and cursor location in image.
    statusLabel = new Label(shell, SWT.NONE);
    statusLabel.setText("");
    gridData = new GridData();
    gridData.horizontalSpan = 2;
    gridData.horizontalAlignment = GridData.FILL;
    statusLabel.setLayoutData(gridData);
}

Example 19 with Canvas

use of org.eclipse.swt.widgets.Canvas in project eclipse.platform.swt by eclipse.

the class DNDExample method createDropWidget.

private void createDropWidget(Composite parent) {
    parent.setLayout(new FormLayout());
    Combo combo = new Combo(parent, SWT.READ_ONLY);
    combo.setItems("Toggle Button", "Radio Button", "Checkbox", "Canvas", "Label", "List", "Table", "Tree", "Text", "StyledText", "Combo");
    combo.select(LABEL);
    dropControlType = combo.getSelectionIndex();
    dropControl = createWidget(dropControlType, parent, "Drop Target");
    combo.addSelectionListener(widgetSelectedAdapter(e -> {
        Object data = dropControl.getLayoutData();
        Composite dropParent = dropControl.getParent();
        dropControl.dispose();
        Combo c = (Combo) e.widget;
        dropControlType = c.getSelectionIndex();
        dropControl = createWidget(dropControlType, dropParent, "Drop Target");
        dropControl.setLayoutData(data);
        if (dropEnabled)
            createDropTarget();
        dropParent.layout();
    }));
    Button b = new Button(parent, SWT.CHECK);
    b.setText("DropTarget");
    b.addSelectionListener(widgetSelectedAdapter(e -> {
        Button eb = (Button) e.widget;
        dropEnabled = eb.getSelection();
        if (dropEnabled) {
            createDropTarget();
        } else {
            if (dropTarget != null) {
                dropTarget.dispose();
            }
            dropTarget = null;
        }
    }));
    // initialize state
    b.setSelection(true);
    dropEnabled = true;
    FormData data = new FormData();
    data.top = new FormAttachment(0, 10);
    data.bottom = new FormAttachment(combo, -10);
    data.left = new FormAttachment(0, 10);
    data.right = new FormAttachment(100, -10);
    dropControl.setLayoutData(data);
    data = new FormData();
    data.bottom = new FormAttachment(100, -10);
    data.left = new FormAttachment(0, 10);
    combo.setLayoutData(data);
    data = new FormData();
    data.bottom = new FormAttachment(100, -10);
    data.left = new FormAttachment(combo, 10);
    b.setLayoutData(data);
}

Example 20 with Canvas

use of org.eclipse.swt.widgets.Canvas in project eclipse.platform.swt by eclipse.

the class GraphicsExample method createCanvas.

void createCanvas(Composite parent) {
    int style = SWT.NO_BACKGROUND;
    if (dbItem.getSelection())
        style |= SWT.DOUBLE_BUFFERED;
    canvas = new Canvas(parent, style);
    canvas.addListener(SWT.Paint, event -> {
        GC gc = event.gc;
        Rectangle rect = canvas.getClientArea();
        Device device = gc.getDevice();
        Pattern pattern = null;
        if (background.getBgColor1() != null) {
            if (background.getBgColor2() != null) {
                // gradient
                pattern = new Pattern(device, 0, 0, rect.width, rect.height, background.getBgColor1(), background.getBgColor2());
                gc.setBackgroundPattern(pattern);
            } else {
                // solid color
                gc.setBackground(background.getBgColor1());
            }
        } else if (background.getBgImage() != null) {
            // image
            pattern = new Pattern(device, background.getBgImage());
            gc.setBackgroundPattern(pattern);
        }
        gc.fillRectangle(rect);
        GraphicsTab tab = getTab();
        if (tab != null)
            tab.paint(gc, rect.width, rect.height);
        if (pattern != null)
            pattern.dispose();
    });
}