public void mouseMove(MouseEvent e) {
   if ((e.stateMask & SWT.BUTTON1) == 0) return;
   GC gc = new GC((Canvas) e.widget);
   gc.drawLine(p.x, p.y, e.x, e.y);
   gc.dispose();
   updatePoint(e);
 }
示例#2
0
 /** Sets or clears the caret in the "Example" widget. */
 void setCaret() {
   Caret oldCaret = canvas.getCaret();
   if (caretButton.getSelection()) {
     Caret newCaret = new Caret(canvas, SWT.NONE);
     Font font = canvas.getFont();
     newCaret.setFont(font);
     GC gc = new GC(canvas);
     gc.setFont(font);
     newCaret.setBounds(1, 1, 1, gc.getFontMetrics().getHeight());
     gc.dispose();
     canvas.setCaret(newCaret);
     canvas.setFocus();
   } else {
     canvas.setCaret(null);
   }
   if (oldCaret != null) oldCaret.dispose();
 }
 public static void main(String[] args) {
   final Display display = new Display();
   final Image image = new Image(display, 16, 16);
   GC gc = new GC(image);
   gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
   gc.fillRectangle(image.getBounds());
   gc.dispose();
   final Shell shell = new Shell(display);
   shell.setText("Lazy Table");
   shell.setLayout(new FillLayout());
   final Table table = new Table(shell, SWT.BORDER | SWT.MULTI);
   table.setSize(200, 200);
   Thread thread =
       new Thread() {
         @Override
         public void run() {
           for (int i = 0; i < 20000; i++) {
             if (table.isDisposed()) return;
             final int[] index = new int[] {i};
             display.syncExec(
                 () -> {
                   if (table.isDisposed()) return;
                   TableItem item = new TableItem(table, SWT.NONE);
                   item.setText("Table Item " + index[0]);
                   item.setImage(image);
                 });
           }
         }
       };
   thread.start();
   shell.setSize(200, 200);
   shell.open();
   while (!shell.isDisposed()) {
     if (!display.readAndDispatch()) display.sleep();
   }
   image.dispose();
   display.dispose();
 }
  public static void main(String[] args) {
    final ImageFileNameProvider filenameProvider =
        new ImageFileNameProvider() {
          @Override
          public String getImagePath(int zoom) {
            switch (zoom) {
              case 150:
                return IMAGE_PATH_150;
              case 200:
                return IMAGE_PATH_200;
              default:
                return IMAGE_PATH_100;
            }
          }
        };
    final ImageDataProvider imageDataProvider =
        new ImageDataProvider() {
          @Override
          public ImageData getImageData(int zoom) {
            switch (zoom) {
              case 150:
                return new ImageData(IMAGE_PATH_150);
              case 200:
                return new ImageData(IMAGE_PATH_200);
              default:
                return new ImageData(IMAGE_PATH_100);
            }
          }
        };

    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setLayout(new GridLayout(2, false));

    new Label(shell, SWT.NONE).setText(IMAGE_200 + ":");
    new Label(shell, SWT.NONE).setImage(new Image(display, IMAGE_PATH_200));

    new Label(shell, SWT.NONE).setText(IMAGE_150 + ":");
    new Label(shell, SWT.NONE).setImage(new Image(display, IMAGE_PATH_150));

    new Label(shell, SWT.NONE).setText(IMAGE_100 + ":");
    new Label(shell, SWT.NONE).setImage(new Image(display, IMAGE_PATH_100));

    new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL)
        .setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));

    new Label(shell, SWT.NONE).setText("ImageFileNameProvider:");
    new Label(shell, SWT.NONE).setImage(new Image(display, filenameProvider));

    new Label(shell, SWT.NONE).setText("ImageDataProvider:");
    new Label(shell, SWT.NONE).setImage(new Image(display, imageDataProvider));

    new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL)
        .setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));

    new Label(shell, SWT.NONE).setText("Canvas\n(PaintListener)");
    final Point size = new Point(550, 35);
    final Canvas canvas = new Canvas(shell, SWT.NONE);
    canvas.addPaintListener(
        new PaintListener() {
          @Override
          public void paintControl(PaintEvent e) {
            Point size = canvas.getSize();
            paintImage(e.gc, size);
          }
        });
    canvas.setLayoutData(new GridData(size.x, size.y));

    new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL)
        .setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));

    new Label(shell, SWT.NONE).setText("Painted image\n (default resolution)");
    Image image = new Image(display, size.x, size.y);
    GC gc = new GC(image);
    try {
      paintImage(gc, size);
    } finally {
      gc.dispose();
    }
    new Label(shell, SWT.NONE).setImage(image);

    new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL)
        .setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));

    new Label(shell, SWT.NONE).setText("Painted image\n(multi-res, unzoomed paint)");
    new Label(shell, SWT.NONE)
        .setImage(
            new Image(
                display,
                new ImageDataProvider() {
                  @Override
                  public ImageData getImageData(int zoom) {
                    Image temp = new Image(display, size.x * zoom / 100, size.y * zoom / 100);
                    GC gc = new GC(temp);
                    try {
                      paintImage(gc, size);
                      return temp.getImageData();
                    } finally {
                      gc.dispose();
                      temp.dispose();
                    }
                  }
                }));

    new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL)
        .setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));

    new Label(shell, SWT.NONE).setText("Painted image\n(multi-res, zoomed paint)");
    new Label(shell, SWT.NONE)
        .setImage(
            new Image(
                display,
                new ImageDataProvider() {
                  @Override
                  public ImageData getImageData(int zoom) {
                    Image temp = new Image(display, size.x * zoom / 100, size.y * zoom / 100);
                    GC gc = new GC(temp);
                    try {
                      paintImage2(
                          gc, new Point(size.x * zoom / 100, size.y * zoom / 100), zoom / 100);
                      return temp.getImageData();
                    } finally {
                      gc.dispose();
                      temp.dispose();
                    }
                  }
                }));

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