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

Introduction

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

Prototype

public void setBackground(Color color) 

Source Link

Document

Sets the receiver's background color to the color specified by the argument, or to the default system color for the control if the argument is null.

Usage

From source file:CanvasKeyEvent.java

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

    shell.setLayout(new RowLayout());
    final Canvas canvas = new Canvas(shell, SWT.NULL);
    canvas.setSize(500, 500);//from  w w w.  ja v  a2  s  .  c om
    canvas.setBackground(display.getSystemColor(SWT.COLOR_YELLOW));

    canvas.addKeyListener(new KeyListener() {
        public void keyPressed(KeyEvent e) {
            GC gc = new GC(canvas);
            Rectangle rect = canvas.getClientArea();
            gc.fillRectangle(rect.x, rect.y, rect.width, rect.height);

            Font font = new Font(display, "Arial", 32, SWT.BOLD);
            gc.setFont(font);

            gc.drawString("" + e.character, 15, 10);

            gc.dispose();
            font.dispose();
        }

        public void keyReleased(KeyEvent e) {
        }
    });

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

---

From source file:org.eclipse.swt.snippets.Snippet21.java

public static void main(String[] args) {
    Display display = new Display();
    final Color red = display.getSystemColor(SWT.COLOR_RED);
    final Color blue = display.getSystemColor(SWT.COLOR_BLUE);
    Shell shell = new Shell(display);
    shell.setText("Snippet 21");
    Button b = new Button(shell, SWT.PUSH);
    Rectangle clientArea = shell.getClientArea();
    b.setBounds(clientArea.x + 10, clientArea.y + 10, 100, 32);
    b.setText("Button");
    shell.setDefaultButton(b);//ww w  . j ava 2s .c  o m
    final Canvas c = new Canvas(shell, SWT.BORDER);
    c.setBounds(10, 50, 100, 32);
    c.addListener(SWT.Traverse, e -> {
        switch (e.detail) {
        /* Do tab group traversal */
        case SWT.TRAVERSE_ESCAPE:
        case SWT.TRAVERSE_RETURN:
        case SWT.TRAVERSE_TAB_NEXT:
        case SWT.TRAVERSE_TAB_PREVIOUS:
        case SWT.TRAVERSE_PAGE_NEXT:
        case SWT.TRAVERSE_PAGE_PREVIOUS:
            e.doit = true;
            break;
        }
    });
    c.addListener(SWT.FocusIn, e -> c.setBackground(red));
    c.addListener(SWT.FocusOut, e -> c.setBackground(blue));
    c.addListener(SWT.KeyDown, e -> System.out.println("KEY"));
    Text t = new Text(shell, SWT.SINGLE | SWT.BORDER);
    t.setBounds(10, 85, 100, 32);

    Text r = new Text(shell, SWT.MULTI | SWT.BORDER);
    r.setBounds(10, 120, 100, 32);

    c.setFocus();
    shell.setSize(200, 200);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

---

From source file:Snippet21.java

public static void main(String[] args) {
    Display display = new Display();
    final Color red = display.getSystemColor(SWT.COLOR_RED);
    final Color blue = display.getSystemColor(SWT.COLOR_BLUE);
    Shell shell = new Shell(display);
    Button b = new Button(shell, SWT.PUSH);
    b.setBounds(10, 10, 100, 32);/*  ww  w  .  j a v  a  2s. c om*/
    b.setText("Button");
    shell.setDefaultButton(b);
    final Canvas c = new Canvas(shell, SWT.BORDER);
    c.setBounds(10, 50, 100, 32);
    c.addListener(SWT.Traverse, new Listener() {
        public void handleEvent(Event e) {
            switch (e.detail) {
            /* Do tab group traversal */
            case SWT.TRAVERSE_ESCAPE:
            case SWT.TRAVERSE_RETURN:
            case SWT.TRAVERSE_TAB_NEXT:
            case SWT.TRAVERSE_TAB_PREVIOUS:
            case SWT.TRAVERSE_PAGE_NEXT:
            case SWT.TRAVERSE_PAGE_PREVIOUS:
                e.doit = true;
                break;
            }
        }
    });
    c.addListener(SWT.FocusIn, new Listener() {
        public void handleEvent(Event e) {
            c.setBackground(red);
        }
    });
    c.addListener(SWT.FocusOut, new Listener() {
        public void handleEvent(Event e) {
            c.setBackground(blue);
        }
    });
    c.addListener(SWT.KeyDown, new Listener() {
        public void handleEvent(Event e) {
            System.out.println("KEY");
            for (int i = 0; i < 64; i++) {
                Color c1 = red, c2 = blue;
                if (c.isFocusControl()) {
                    c1 = blue;
                    c2 = red;
                }
                c.setBackground(c1);
                c.update();
                c.setBackground(c2);
            }
        }
    });
    Text t = new Text(shell, SWT.SINGLE | SWT.BORDER);
    t.setBounds(10, 85, 100, 32);

    Text r = new Text(shell, SWT.MULTI | SWT.BORDER);
    r.setBounds(10, 120, 100, 32);

    c.setFocus();
    shell.setSize(200, 200);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

---

From source file:widgetTest3.java

/** * Images ** */

public static void doubleBuffering(Composite composite) {
    //       Create canvas
    final Canvas canvas = new Canvas(composite, SWT.BORDER);
    //       Get white system color
    Color white = canvas.getDisplay().getSystemColor(SWT.COLOR_WHITE);
    //       Set canvas background to white
    canvas.setBackground(white);
    //       Add paint listener
    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            // Get Display instance from the event object
            Display display = e.display;
            // Get black and red system color - don't dispose these
            Color black = display.getSystemColor(SWT.COLOR_BLACK);
            Color red = display.getSystemColor(SWT.COLOR_RED);
            // Get the graphics context from event object
            GC gc = e.gc;//ww w  .  j  a  v  a 2 s  .  c  om
            // Get the widget that caused the event
            Composite source = (Composite) e.widget;
            // Get the size of this widgets client area
            Rectangle rect = source.getClientArea();
            // Create buffer for double buffering
            Image buffer = new Image(display, rect.width, rect.height);
            // Create graphics context for this buffer
            GC bufferGC = new GC(buffer);
            // perform drawing operations
            bufferGC.setBackground(red);
            bufferGC.fillRectangle(5, 5, rect.width - 10, rect.height - 10);
            bufferGC.setForeground(black);
            bufferGC.drawRectangle(5, 5, rect.width - 10, rect.height - 10);
            bufferGC.setBackground(source.getBackground());
            bufferGC.fillRectangle(10, 10, rect.width - 20, rect.height - 20);
            // Now draw the buffered image to the target drawable
            gc.drawImage(buffer, 0, 0);
            // Dispose of the buffer's graphics context
            bufferGC.dispose();
            // Dispose of the buffer
            buffer.dispose();
        }
    });
}

---

From source file:XOR.java

public XOR() {
    shell.setLayout(new FillLayout());
    final Canvas canvas = new Canvas(shell, SWT.NULL);
    canvas.setBackground(display.getSystemColor(SWT.COLOR_WHITE));

    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            e.gc.setXORMode(true);// w ww .  j  av a2s.c o  m

            e.gc.setBackground(display.getSystemColor(SWT.COLOR_GREEN));
            e.gc.fillOval(60, 10, 100, 100); // Top 

            e.gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
            e.gc.fillOval(10, 60, 120, 120); // left bottom      

            e.gc.setBackground(display.getSystemColor(SWT.COLOR_BLUE));
            e.gc.fillOval(110, 60, 100, 100); // right bottom      

        }
    });

    shell.setSize(300, 220);
    shell.open();
    //textUser.forceFocus();

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

    display.dispose();
}

---

From source file:Palettes.java

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

    PaletteData paletteData = new PaletteData(0xFF0000, 0x00FF00, 0x0000FF);
    ImageData imageData = new ImageData(100, 100, 24, paletteData);

    for (int i = 0; i < 100; i++) { // each column.
        for (int j = 0; j < 100; j++) { // each row.
            if (j < 30 || (i > 35 && i < 65))
                imageData.setPixel(i, j, 0xFF);
            else/*from   www.  ja va2s.  c  o m*/
                imageData.setPixel(i, j, 0xFFFF00);
        }
    }

    //      int pixelValue = imageData.getPixel(50, 50);
    //      int redComponent = pixelValue & imageData.palette.redMask;
    //      int greenComponent = pixelValue & imageData.palette.greenMask;
    //      int blueComponent = pixelValue & imageData.palette.blueMask;

    PaletteData paletteData2 = new PaletteData(new RGB[] { new RGB(0, 0, 255), // blue
            new RGB(255, 255, 0) // yellow
    });

    ImageData imageData2 = new ImageData(100, 100, 1, paletteData2);
    for (int i = 0; i < 100; i++) { // each column.
        for (int j = 0; j < 100; j++) { // each row.
            if (j < 30 || (i > 35 && i < 65))
                imageData2.setPixel(i, j, 0);
            else
                imageData2.setPixel(i, j, 1);
        }
    }

    System.out.println(imageData.palette.getRGB(imageData.getPixel(50, 50)));

    final Image image2 = new Image(display, imageData2);

    final Image image = new Image(display, imageData);

    final Canvas canvas = new Canvas(shell, SWT.NULL);
    canvas.setBackground(display.getSystemColor(SWT.COLOR_WHITE));
    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            e.gc.drawImage(image2, 0, 0);
        }
    });

    shell.pack();
    shell.open();
    //textUser.forceFocus();

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

    display.dispose();
}

---

From source file:FocusTraversal.java

private void init() {
    shell.setLayout(new RowLayout());

    Composite composite1 = new Composite(shell, SWT.BORDER);
    composite1.setLayout(new RowLayout());
    composite1.setBackground(display.getSystemColor(SWT.COLOR_WHITE));

    Button button1 = new Button(composite1, SWT.PUSH);
    button1.setText("Button1");

    List list = new List(composite1, SWT.MULTI | SWT.BORDER);
    list.setItems(new String[] { "Item-1", "Item-2", "Item-3" });

    Button radioButton1 = new Button(composite1, SWT.RADIO);
    radioButton1.setText("radio-1");
    Button radioButton2 = new Button(composite1, SWT.RADIO);
    radioButton2.setText("radio-2");

    Composite composite2 = new Composite(shell, SWT.BORDER);
    composite2.setLayout(new RowLayout());
    composite2.setBackground(display.getSystemColor(SWT.COLOR_GREEN));

    Button button2 = new Button(composite2, SWT.PUSH);
    button2.setText("Button2");

    final Canvas canvas = new Canvas(composite2, SWT.NULL);
    canvas.setSize(50, 50);//from w  w w.j  av a  2s .co m
    canvas.setBackground(display.getSystemColor(SWT.COLOR_YELLOW));

    Combo combo = new Combo(composite2, SWT.DROP_DOWN);
    combo.add("combo");
    combo.select(0);

    canvas.addKeyListener(new KeyListener() {
        public void keyPressed(KeyEvent e) {
            GC gc = new GC(canvas);
            // Erase background first. 
            Rectangle rect = canvas.getClientArea();
            gc.fillRectangle(rect.x, rect.y, rect.width, rect.height);

            Font font = new Font(display, "Arial", 32, SWT.BOLD);
            gc.setFont(font);

            gc.drawString("" + e.character, 15, 10);

            gc.dispose();
            font.dispose();
        }

        public void keyReleased(KeyEvent e) {
        }
    });

    canvas.addTraverseListener(new TraverseListener() {
        public void keyTraversed(TraverseEvent e) {
            if (e.detail == SWT.TRAVERSE_TAB_NEXT || e.detail == SWT.TRAVERSE_TAB_PREVIOUS)
                e.doit = true;
        }
    });

    composite1.setTabList(new Control[] { button1, list });
    composite2.setTabList(new Control[] { button2, canvas, combo });

    shell.setTabList(new Control[] { composite2, composite1 });
}

---

From source file:PointExample.java

/**
 * Creates the main window's contents/*w ww. j  av a2  s.  c  om*/
 * 
 * @param shell the main window
 */
private void createContents(Shell shell) {
    shell.setLayout(new FillLayout());

    // Create the canvas for drawing on
    Canvas canvas = new Canvas(shell, SWT.NONE);

    // Add the paint handler to draw the sine wave
    canvas.addPaintListener(new PointExamplePaintListener());

    // Use a white background
    canvas.setBackground(shell.getDisplay().getSystemColor(SWT.COLOR_WHITE));
}

---

From source file:org.eclipse.swt.examples.paint.PaintExample.java

/**
 * Creates the GUI./* ww w . ja  v  a2 s.  c o m*/
 */
public void createGUI(Composite parent) {
    GridLayout gridLayout;
    GridData gridData;

    /*** Create principal GUI layout elements ***/
    Composite displayArea = new Composite(parent, SWT.NONE);
    gridLayout = new GridLayout();
    gridLayout.numColumns = 1;
    displayArea.setLayout(gridLayout);

    // Creating these elements here avoids the need to instantiate the GUI elements
    // in strict layout order.  The natural layout ordering is an artifact of using
    // SWT layouts, but unfortunately it is not the same order as that required to
    // instantiate all of the non-GUI application elements to satisfy referential
    // dependencies.  It is possible to reorder the initialization to some extent, but
    // this can be very tedious.

    // paint canvas
    final Canvas paintCanvas = new Canvas(displayArea,
            SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL | SWT.NO_REDRAW_RESIZE | SWT.NO_BACKGROUND);
    gridData = new GridData(GridData.FILL_HORIZONTAL | GridData.FILL_VERTICAL);
    paintCanvas.setLayoutData(gridData);
    paintCanvas.setBackground(paintColorWhite);

    // color selector frame
    final Composite colorFrame = new Composite(displayArea, SWT.NONE);
    gridData = new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL);
    colorFrame.setLayoutData(gridData);

    // tool settings frame
    final Composite toolSettingsFrame = new Composite(displayArea, SWT.NONE);
    gridData = new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL);
    toolSettingsFrame.setLayoutData(gridData);

    // status text
    final Text statusText = new Text(displayArea, SWT.BORDER | SWT.SINGLE | SWT.READ_ONLY);
    gridData = new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL);
    statusText.setLayoutData(gridData);

    /*** Create the remaining application elements inside the principal GUI layout elements ***/
    // paintSurface
    paintSurface = new PaintSurface(paintCanvas, statusText, paintColorWhite);

    // finish initializing the tool data
    tools[Pencil_tool].data = new PencilTool(toolSettings, paintSurface);
    tools[Airbrush_tool].data = new AirbrushTool(toolSettings, paintSurface);
    tools[Line_tool].data = new LineTool(toolSettings, paintSurface);
    tools[PolyLine_tool].data = new PolyLineTool(toolSettings, paintSurface);
    tools[Rectangle_tool].data = new RectangleTool(toolSettings, paintSurface);
    tools[RoundedRectangle_tool].data = new RoundedRectangleTool(toolSettings, paintSurface);
    tools[Ellipse_tool].data = new EllipseTool(toolSettings, paintSurface);
    tools[Text_tool].data = new TextTool(toolSettings, paintSurface);

    // colorFrame
    gridLayout = new GridLayout();
    gridLayout.numColumns = 3;
    gridLayout.marginHeight = 0;
    gridLayout.marginWidth = 0;
    colorFrame.setLayout(gridLayout);

    // activeForegroundColorCanvas, activeBackgroundColorCanvas
    activeForegroundColorCanvas = new Canvas(colorFrame, SWT.BORDER);
    gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
    gridData.heightHint = 24;
    gridData.widthHint = 24;
    activeForegroundColorCanvas.setLayoutData(gridData);

    activeBackgroundColorCanvas = new Canvas(colorFrame, SWT.BORDER);
    gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
    gridData.heightHint = 24;
    gridData.widthHint = 24;
    activeBackgroundColorCanvas.setLayoutData(gridData);

    // paletteCanvas
    final Canvas paletteCanvas = new Canvas(colorFrame, SWT.BORDER | SWT.NO_BACKGROUND);
    gridData = new GridData(GridData.FILL_HORIZONTAL);
    gridData.heightHint = 24;
    paletteCanvas.setLayoutData(gridData);
    paletteCanvas.addListener(SWT.MouseDown, new Listener() {
        @Override
        public void handleEvent(Event e) {
            Rectangle bounds = paletteCanvas.getClientArea();
            Color color = getColorAt(bounds, e.x, e.y);

            if (e.button == 1)
                setForegroundColor(color);
            else
                setBackgroundColor(color);
        }

        private Color getColorAt(Rectangle bounds, int x, int y) {
            if (bounds.height <= 1 && bounds.width <= 1)
                return paintColorWhite;
            final int row = (y - bounds.y) * numPaletteRows / bounds.height;
            final int col = (x - bounds.x) * numPaletteCols / bounds.width;
            return paintColors[Math.min(Math.max(row * numPaletteCols + col, 0), paintColors.length - 1)];
        }
    });
    Listener refreshListener = e -> {
        if (e.gc == null)
            return;
        Rectangle bounds = paletteCanvas.getClientArea();
        for (int row = 0; row < numPaletteRows; ++row) {
            for (int col = 0; col < numPaletteCols; ++col) {
                final int x = bounds.width * col / numPaletteCols;
                final int y = bounds.height * row / numPaletteRows;
                final int width = Math.max(bounds.width * (col + 1) / numPaletteCols - x, 1);
                final int height = Math.max(bounds.height * (row + 1) / numPaletteRows - y, 1);
                e.gc.setBackground(paintColors[row * numPaletteCols + col]);
                e.gc.fillRectangle(bounds.x + x, bounds.y + y, width, height);
            }
        }
    };
    paletteCanvas.addListener(SWT.Resize, refreshListener);
    paletteCanvas.addListener(SWT.Paint, refreshListener);
    //paletteCanvas.redraw();

    // toolSettingsFrame
    gridLayout = new GridLayout();
    gridLayout.numColumns = 4;
    gridLayout.marginHeight = 0;
    gridLayout.marginWidth = 0;
    toolSettingsFrame.setLayout(gridLayout);

    Label label = new Label(toolSettingsFrame, SWT.NONE);
    label.setText(getResourceString("settings.AirbrushRadius.text"));

    final Scale airbrushRadiusScale = new Scale(toolSettingsFrame, SWT.HORIZONTAL);
    airbrushRadiusScale.setMinimum(5);
    airbrushRadiusScale.setMaximum(50);
    airbrushRadiusScale.setSelection(toolSettings.airbrushRadius);
    airbrushRadiusScale.setLayoutData(new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL));
    airbrushRadiusScale.addSelectionListener(widgetSelectedAdapter(e -> {
        toolSettings.airbrushRadius = airbrushRadiusScale.getSelection();
        updateToolSettings();
    }));

    label = new Label(toolSettingsFrame, SWT.NONE);
    label.setText(getResourceString("settings.AirbrushIntensity.text"));

    final Scale airbrushIntensityScale = new Scale(toolSettingsFrame, SWT.HORIZONTAL);
    airbrushIntensityScale.setMinimum(1);
    airbrushIntensityScale.setMaximum(100);
    airbrushIntensityScale.setSelection(toolSettings.airbrushIntensity);
    airbrushIntensityScale.setLayoutData(new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL));
    airbrushIntensityScale.addSelectionListener(widgetSelectedAdapter(e -> {
        toolSettings.airbrushIntensity = airbrushIntensityScale.getSelection();
        updateToolSettings();
    }));
}

---

From source file:PaintExample.java

/**
 * Creates the GUI.//from  w w  w. j  av a 2s .  c o  m
 */
public void createGUI(Composite parent) {
    GridLayout gridLayout;
    GridData gridData;

    /*** Create principal GUI layout elements ***/
    Composite displayArea = new Composite(parent, SWT.NONE);
    gridLayout = new GridLayout();
    gridLayout.numColumns = 1;
    displayArea.setLayout(gridLayout);

    // Creating these elements here avoids the need to instantiate the GUI elements
    // in strict layout order.  The natural layout ordering is an artifact of using
    // SWT layouts, but unfortunately it is not the same order as that required to
    // instantiate all of the non-GUI application elements to satisfy referential
    // dependencies.  It is possible to reorder the initialization to some extent, but
    // this can be very tedious.

    // paint canvas
    final Canvas paintCanvas = new Canvas(displayArea,
            SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL | SWT.NO_REDRAW_RESIZE | SWT.NO_BACKGROUND);
    gridData = new GridData(GridData.FILL_HORIZONTAL | GridData.FILL_VERTICAL);
    paintCanvas.setLayoutData(gridData);
    paintCanvas.setBackground(paintColorWhite);

    // color selector frame
    final Composite colorFrame = new Composite(displayArea, SWT.NONE);
    gridData = new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL);
    colorFrame.setLayoutData(gridData);

    // tool settings frame
    final Composite toolSettingsFrame = new Composite(displayArea, SWT.NONE);
    gridData = new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL);
    toolSettingsFrame.setLayoutData(gridData);

    // status text
    final Text statusText = new Text(displayArea, SWT.BORDER | SWT.SINGLE | SWT.READ_ONLY);
    gridData = new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL);
    statusText.setLayoutData(gridData);

    /*** Create the remaining application elements inside the principal GUI layout elements ***/
    // paintSurface
    paintSurface = new PaintSurface(paintCanvas, statusText, paintColorWhite);

    // finish initializing the tool data
    tools[Pencil_tool].data = new PencilTool(toolSettings, paintSurface);
    tools[Airbrush_tool].data = new AirbrushTool(toolSettings, paintSurface);
    tools[Line_tool].data = new LineTool(toolSettings, paintSurface);
    tools[PolyLine_tool].data = new PolyLineTool(toolSettings, paintSurface);
    tools[Rectangle_tool].data = new RectangleTool(toolSettings, paintSurface);
    tools[RoundedRectangle_tool].data = new RoundedRectangleTool(toolSettings, paintSurface);
    tools[Ellipse_tool].data = new EllipseTool(toolSettings, paintSurface);
    tools[Text_tool].data = new TextTool(toolSettings, paintSurface);

    // colorFrame      
    gridLayout = new GridLayout();
    gridLayout.numColumns = 3;
    gridLayout.marginHeight = 0;
    gridLayout.marginWidth = 0;
    colorFrame.setLayout(gridLayout);

    // activeForegroundColorCanvas, activeBackgroundColorCanvas
    activeForegroundColorCanvas = new Canvas(colorFrame, SWT.BORDER);
    gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
    gridData.heightHint = 24;
    gridData.widthHint = 24;
    activeForegroundColorCanvas.setLayoutData(gridData);

    activeBackgroundColorCanvas = new Canvas(colorFrame, SWT.BORDER);
    gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
    gridData.heightHint = 24;
    gridData.widthHint = 24;
    activeBackgroundColorCanvas.setLayoutData(gridData);

    // paletteCanvas
    final Canvas paletteCanvas = new Canvas(colorFrame, SWT.BORDER | SWT.NO_BACKGROUND);
    gridData = new GridData(GridData.FILL_HORIZONTAL);
    gridData.heightHint = 24;
    paletteCanvas.setLayoutData(gridData);
    paletteCanvas.addListener(SWT.MouseDown, new Listener() {
        public void handleEvent(Event e) {
            Rectangle bounds = paletteCanvas.getClientArea();
            Color color = getColorAt(bounds, e.x, e.y);

            if (e.button == 1)
                setForegroundColor(color);
            else
                setBackgroundColor(color);
        }

        private Color getColorAt(Rectangle bounds, int x, int y) {
            if (bounds.height <= 1 && bounds.width <= 1)
                return paintColorWhite;
            final int row = (y - bounds.y) * numPaletteRows / bounds.height;
            final int col = (x - bounds.x) * numPaletteCols / bounds.width;
            return paintColors[Math.min(Math.max(row * numPaletteCols + col, 0), paintColors.length - 1)];
        }
    });
    Listener refreshListener = new Listener() {
        public void handleEvent(Event e) {
            if (e.gc == null)
                return;
            Rectangle bounds = paletteCanvas.getClientArea();
            for (int row = 0; row < numPaletteRows; ++row) {
                for (int col = 0; col < numPaletteCols; ++col) {
                    final int x = bounds.width * col / numPaletteCols;
                    final int y = bounds.height * row / numPaletteRows;
                    final int width = Math.max(bounds.width * (col + 1) / numPaletteCols - x, 1);
                    final int height = Math.max(bounds.height * (row + 1) / numPaletteRows - y, 1);
                    e.gc.setBackground(paintColors[row * numPaletteCols + col]);
                    e.gc.fillRectangle(bounds.x + x, bounds.y + y, width, height);
                }
            }
        }
    };
    paletteCanvas.addListener(SWT.Resize, refreshListener);
    paletteCanvas.addListener(SWT.Paint, refreshListener);
    //paletteCanvas.redraw();

    // toolSettingsFrame
    gridLayout = new GridLayout();
    gridLayout.numColumns = 4;
    gridLayout.marginHeight = 0;
    gridLayout.marginWidth = 0;
    toolSettingsFrame.setLayout(gridLayout);

    Label label = new Label(toolSettingsFrame, SWT.NONE);
    label.setText(getResourceString("settings.AirbrushRadius.text"));

    final Scale airbrushRadiusScale = new Scale(toolSettingsFrame, SWT.HORIZONTAL);
    airbrushRadiusScale.setMinimum(5);
    airbrushRadiusScale.setMaximum(50);
    airbrushRadiusScale.setSelection(toolSettings.airbrushRadius);
    airbrushRadiusScale.setLayoutData(new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL));
    airbrushRadiusScale.addSelectionListener(new SelectionAdapter() {
        public void widgetSelected(SelectionEvent e) {
            toolSettings.airbrushRadius = airbrushRadiusScale.getSelection();
            updateToolSettings();
        }
    });

    label = new Label(toolSettingsFrame, SWT.NONE);
    label.setText(getResourceString("settings.AirbrushIntensity.text"));

    final Scale airbrushIntensityScale = new Scale(toolSettingsFrame, SWT.HORIZONTAL);
    airbrushIntensityScale.setMinimum(1);
    airbrushIntensityScale.setMaximum(100);
    airbrushIntensityScale.setSelection(toolSettings.airbrushIntensity);
    airbrushIntensityScale.setLayoutData(new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL));
    airbrushIntensityScale.addSelectionListener(new SelectionAdapter() {
        public void widgetSelected(SelectionEvent e) {
            toolSettings.airbrushIntensity = airbrushIntensityScale.getSelection();
            updateToolSettings();
        }
    });
}

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