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

Example 71 with Canvas

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

the class ClipboardExample method createImageTransfer.

void createImageTransfer(Composite copyParent, Composite pasteParent) {
    final Image[] copyImage = new Image[] { null };
    Label l = new Label(copyParent, SWT.NONE);
    // $NON-NLS-1$
    l.setText("ImageTransfer:");
    GridData data = new GridData();
    data.verticalSpan = 2;
    l.setLayoutData(data);
    final Canvas copyImageCanvas = new Canvas(copyParent, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
    data = new GridData(GridData.FILL_BOTH);
    data.verticalSpan = 2;
    data.widthHint = HSIZE;
    data.heightHint = VSIZE;
    copyImageCanvas.setLayoutData(data);
    final Point copyOrigin = new Point(0, 0);
    final ScrollBar copyHBar = copyImageCanvas.getHorizontalBar();
    copyHBar.setEnabled(false);
    copyHBar.addListener(SWT.Selection, e -> {
        if (copyImage[0] != null) {
            int hSelection = copyHBar.getSelection();
            int destX = -hSelection - copyOrigin.x;
            Rectangle rect = copyImage[0].getBounds();
            copyImageCanvas.scroll(destX, 0, 0, 0, rect.width, rect.height, false);
            copyOrigin.x = -hSelection;
        }
    });
    final ScrollBar copyVBar = copyImageCanvas.getVerticalBar();
    copyVBar.setEnabled(false);
    copyVBar.addListener(SWT.Selection, e -> {
        if (copyImage[0] != null) {
            int vSelection = copyVBar.getSelection();
            int destY = -vSelection - copyOrigin.y;
            Rectangle rect = copyImage[0].getBounds();
            copyImageCanvas.scroll(0, destY, 0, 0, rect.width, rect.height, false);
            copyOrigin.y = -vSelection;
        }
    });
    copyImageCanvas.addListener(SWT.Paint, e -> {
        if (copyImage[0] != null) {
            GC gc = e.gc;
            gc.drawImage(copyImage[0], copyOrigin.x, copyOrigin.y);
            Rectangle rect = copyImage[0].getBounds();
            Rectangle client = copyImageCanvas.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);
            }
            gc.dispose();
        }
    });
    Button openButton = new Button(copyParent, SWT.PUSH);
    openButton.setText("Open Image");
    openButton.addSelectionListener(widgetSelectedAdapter(e -> {
        FileDialog dialog = new FileDialog(shell, SWT.OPEN);
        dialog.setText("Open an image file or cancel");
        String string = dialog.open();
        if (string != null) {
            if (copyImage[0] != null) {
                System.out.println("CopyImage");
                copyImage[0].dispose();
            }
            copyImage[0] = new Image(e.display, string);
            copyVBar.setEnabled(true);
            copyHBar.setEnabled(true);
            copyOrigin.x = 0;
            copyOrigin.y = 0;
            Rectangle rect = copyImage[0].getBounds();
            Rectangle client = copyImageCanvas.getClientArea();
            copyHBar.setMaximum(rect.width);
            copyVBar.setMaximum(rect.height);
            copyHBar.setThumb(Math.min(rect.width, client.width));
            copyVBar.setThumb(Math.min(rect.height, client.height));
            copyImageCanvas.scroll(0, 0, 0, 0, rect.width, rect.height, true);
            copyVBar.setSelection(0);
            copyHBar.setSelection(0);
            copyImageCanvas.redraw();
        }
    }));
    Button b = new Button(copyParent, SWT.PUSH);
    b.setText("Copy");
    b.addSelectionListener(widgetSelectedAdapter(e -> {
        if (copyImage[0] != null) {
            status.setText("");
            // Fetch ImageData at current zoom and save in the clip-board.
            clipboard.setContents(new Object[] { copyImage[0].getImageDataAtCurrentZoom() }, new Transfer[] { ImageTransfer.getInstance() });
        } else {
            status.setText("No image to copy");
        }
    }));
    final Image[] pasteImage = new Image[] { null };
    l = new Label(pasteParent, SWT.NONE);
    l.setText("ImageTransfer:");
    final Canvas pasteImageCanvas = new Canvas(pasteParent, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
    data = new GridData(GridData.FILL_BOTH);
    data.widthHint = HSIZE;
    data.heightHint = VSIZE;
    pasteImageCanvas.setLayoutData(data);
    final Point pasteOrigin = new Point(0, 0);
    final ScrollBar pasteHBar = pasteImageCanvas.getHorizontalBar();
    pasteHBar.setEnabled(false);
    pasteHBar.addListener(SWT.Selection, e -> {
        if (pasteImage[0] != null) {
            int hSelection = pasteHBar.getSelection();
            int destX = -hSelection - pasteOrigin.x;
            Rectangle rect = pasteImage[0].getBounds();
            pasteImageCanvas.scroll(destX, 0, 0, 0, rect.width, rect.height, false);
            pasteOrigin.x = -hSelection;
        }
    });
    final ScrollBar pasteVBar = pasteImageCanvas.getVerticalBar();
    pasteVBar.setEnabled(false);
    pasteVBar.addListener(SWT.Selection, e -> {
        if (pasteImage[0] != null) {
            int vSelection = pasteVBar.getSelection();
            int destY = -vSelection - pasteOrigin.y;
            Rectangle rect = pasteImage[0].getBounds();
            pasteImageCanvas.scroll(0, destY, 0, 0, rect.width, rect.height, false);
            pasteOrigin.y = -vSelection;
        }
    });
    pasteImageCanvas.addListener(SWT.Paint, e -> {
        if (pasteImage[0] != null) {
            GC gc = e.gc;
            gc.drawImage(pasteImage[0], pasteOrigin.x, pasteOrigin.y);
            Rectangle rect = pasteImage[0].getBounds();
            Rectangle client = pasteImageCanvas.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);
            }
        }
    });
    b = new Button(pasteParent, SWT.PUSH);
    b.setText("Paste");
    b.addSelectionListener(widgetSelectedAdapter(e -> {
        ImageData imageData = (ImageData) clipboard.getContents(ImageTransfer.getInstance());
        if (imageData != null) {
            if (pasteImage[0] != null) {
                System.out.println("PasteImage");
                pasteImage[0].dispose();
            }
            status.setText("");
            // Consume the ImageData at current zoom as-is.
            pasteImage[0] = new Image(e.display, new AutoScaleImageDataProvider(imageData));
            pasteVBar.setEnabled(true);
            pasteHBar.setEnabled(true);
            pasteOrigin.x = 0;
            pasteOrigin.y = 0;
            Rectangle rect = pasteImage[0].getBounds();
            Rectangle client = pasteImageCanvas.getClientArea();
            pasteHBar.setMaximum(rect.width);
            pasteVBar.setMaximum(rect.height);
            pasteHBar.setThumb(Math.min(rect.width, client.width));
            pasteVBar.setThumb(Math.min(rect.height, client.height));
            pasteImageCanvas.scroll(0, 0, 0, 0, rect.width, rect.height, true);
            pasteVBar.setSelection(0);
            pasteHBar.setSelection(0);
            pasteImageCanvas.redraw();
        } else {
            status.setText("No image to paste");
        }
    }));
}

Example 72 with Canvas

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

the class AccessibleActionExample method main.

public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    shell.setText("Accessible Action Example");
    Button button = new Button(shell, SWT.PUSH);
    button.setText("Button");
    final Canvas customButton = new Canvas(shell, SWT.NONE) {

        @Override
        public Point computeSize(int wHint, int hHint, boolean changed) {
            GC gc = new GC(this);
            Point point = gc.stringExtent(buttonText);
            gc.dispose();
            point.x += MARGIN;
            point.y += MARGIN;
            return point;
        }
    };
    customButton.addPaintListener(e -> {
        Rectangle clientArea = customButton.getClientArea();
        Point stringExtent = e.gc.stringExtent(buttonText);
        int x = clientArea.x + (clientArea.width - stringExtent.x) / 2;
        int y = clientArea.y + (clientArea.height - stringExtent.y) / 2;
        e.gc.drawString(buttonText, x, y);
    });
    customButton.addMouseListener(MouseListener.mouseDownAdapter(e -> {
        int actionIndex = (e.button == 1) ? 0 : 1;
        customButtonAction(actionIndex);
    }));
    customButton.addKeyListener(new KeyAdapter() {

        @Override
        public void keyPressed(KeyEvent e) {
            int modifierKeys = e.stateMask & SWT.MODIFIER_MASK;
            if (modifierKeys == SWT.CTRL || modifierKeys == 0) {
                if (e.character == '1')
                    customButtonAction(0);
                else if (e.character == '2')
                    customButtonAction(1);
            }
        }
    });
    Accessible accessible = customButton.getAccessible();
    accessible.addAccessibleListener(new AccessibleAdapter() {

        @Override
        public void getName(AccessibleEvent e) {
            e.result = buttonText;
        }

        @Override
        public void getKeyboardShortcut(AccessibleEvent e) {
            // default action is 'action 1'
            e.result = "CTRL+1";
        }
    });
    accessible.addAccessibleControlListener(new AccessibleControlAdapter() {

        @Override
        public void getRole(AccessibleControlEvent e) {
            e.detail = ACC.ROLE_PUSHBUTTON;
        }
    });
    accessible.addAccessibleActionListener(new AccessibleActionAdapter() {

        @Override
        public void getActionCount(AccessibleActionEvent e) {
            e.count = 2;
        }

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

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

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

        @Override
        public void getKeyBinding(AccessibleActionEvent e) {
            switch(e.index) {
                case 0:
                    e.result = "1;CTRL+1";
                    break;
                case 1:
                    e.result = "2;CTRL+2";
                    break;
                default:
                    e.result = null;
            }
        }
    });
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

Example 73 with Canvas

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

the class Test_situational method test_fastStringDrawing.

public void test_fastStringDrawing() {
    PerformanceMeter meter = createMeterWithoutSummary("Draw strings using GC.drawString()");
    int samples;
    for (samples = 0; samples < 10; samples++) {
        int width = 640;
        int height = 480;
        Shell shell = new Shell(display);
        shell.setLayout(new GridLayout());
        Canvas c = new Canvas(shell, SWT.NONE);
        GridData data = new GridData();
        data.widthHint = width;
        data.heightHint = height;
        c.setLayoutData(data);
        shell.pack();
        shell.open();
        while (display.readAndDispatch()) {
        /*empty*/
        }
        try {
            Thread.sleep(2000);
        } catch (Exception e) {
        }
        while (display.readAndDispatch()) {
        /*empty*/
        }
        Color color1 = new Color(display, 0xff, 0, 0xff);
        Color color2 = new Color(display, 0, 0xff, 0xff);
        Font font1 = new Font(display, "Helvetica", 20, SWT.NONE);
        Font font2 = new Font(display, "Helvetica", 10, SWT.BOLD);
        String testString = "The quick brown SWT jumped foxily over the lazy dog.";
        int x1 = 0, y1 = height / 2, x2 = width / 2, y2 = 0;
        meter.start();
        GC gc = new GC(c);
        for (int i = 0; i < 2000; i++) {
            x1 = (x1 + 5) % width;
            y1 = (y1 + 5) % height;
            x2 = (x2 + 5) % width;
            y2 = (y2 + 5) % height;
            gc.setFont((i & 1) == 0 ? font1 : font2);
            gc.setForeground((i & 1) == 0 ? color1 : color2);
            gc.stringExtent(testString);
            gc.drawString(testString, x1, y2);
            gc.drawString(testString, x1, y1, true);
        }
        gc.dispose();
        meter.stop();
        shell.dispose();
        color1.dispose();
        color2.dispose();
        font1.dispose();
        font2.dispose();
        while (display.readAndDispatch()) {
        /*empty*/
        }
    }
    disposeMeter(meter);
}

Example 74 with Canvas

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

the class Test_org_eclipse_swt_widgets_Canvas method setUp.

@Override
@Before
public void setUp() {
    super.setUp();
    canvas = new Canvas(shell, 0);
    super.setWidget(canvas);
}

Example 75 with Canvas

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

the class DNDExample method createDragWidget.

private void createDragWidget(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);
    dragControlType = combo.getSelectionIndex();
    dragControl = createWidget(dragControlType, parent, "Drag Source");
    combo.addSelectionListener(widgetSelectedAdapter(e -> {
        Object data = dragControl.getLayoutData();
        Composite dragParent = dragControl.getParent();
        dragControl.dispose();
        Combo c = (Combo) e.widget;
        dragControlType = c.getSelectionIndex();
        dragControl = createWidget(dragControlType, dragParent, "Drag Source");
        dragControl.setLayoutData(data);
        if (dragEnabled)
            createDragSource();
        dragParent.layout();
    }));
    Button b = new Button(parent, SWT.CHECK);
    b.setText("DragSource");
    b.addSelectionListener(widgetSelectedAdapter(e -> {
        Button b1 = (Button) e.widget;
        dragEnabled = b1.getSelection();
        if (dragEnabled) {
            createDragSource();
        } else {
            if (dragSource != null) {
                dragSource.dispose();
            }
            dragSource = null;
        }
    }));
    b.setSelection(true);
    dragEnabled = 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);
    dragControl.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);
}