Examples of org.eclipse.swt.graphics.GC.dispose()

org.eclipse.swt.graphics.GC.dispose()
Disposes of the operating system resources associated with the graphics context. Applications must dispose of all GCs which they allocate.

            GC gc = new GC(textField);
            try {
                Point extent = gc.textExtent("X");//$NON-NLS-1$
                gd.widthHint = widthInChars * extent.x;
            } finally {
                gc.dispose();
            }
        } else {
            gd.horizontalAlignment = GridData.FILL;
            gd.grabExcessHorizontalSpace = true;
        }

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     */
    protected int convertHorizontalDLUsToPixels(Control control, int dlus) {
        GC gc = new GC(control);
        gc.setFont(control.getFont());
        int averageWidth = gc.getFontMetrics().getAverageCharWidth();
        gc.dispose();


        double horizontalDialogUnitSize = averageWidth * 0.25;


        return (int) Math.round(dlus * horizontalDialogUnitSize);
    }

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     */
    protected int convertVerticalDLUsToPixels(Control control, int dlus) {
        GC gc = new GC(control);
        gc.setFont(control.getFont());
        int height = gc.getFontMetrics().getHeight();
        gc.dispose();


        double verticalDialogUnitSize = height * 0.125;


        return (int) Math.round(dlus * verticalDialogUnitSize);
    }

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        // Compute and store a font metric
        GC gc = new GC(button);
        gc.setFont(button.getFont());
        FontMetrics fontMetrics = gc.getFontMetrics();
        gc.dispose();


        int widthHint = org.eclipse.jface.dialogs.Dialog
                .convertVerticalDLUsToPixels(fontMetrics,
                        IDialogConstants.BUTTON_WIDTH);
        data.widthHint = Math.max(widthHint, button.computeSize(SWT.DEFAULT,

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        fExtent = computeImageSize(parent);
        fImage = new Image(parent.getDisplay(), fExtent.x, fExtent.y);
        GC gc = new GC(fImage);
        gc.setBackground(fButton.getBackground());
        gc.fillRectangle(0, 0, fExtent.x, fExtent.y);
        gc.dispose();
        fButton.setImage(fImage);
        fButton.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent event) {
                open();
            }

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        GC gc = new GC(window);
        Font f = JFaceResources.getFontRegistry().get(
                JFaceResources.DIALOG_FONT);
        gc.setFont(f);
        int height = gc.getFontMetrics().getHeight();
        gc.dispose();
        Point p = new Point(height * 3 - 6, height);
        return p;
    }


    /**

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      fColor.dispose();
    }
        fColor = new Color(display, fColorValue);
        gc.setBackground(fColor);
        gc.fillRectangle(1, 3, fExtent.x - 2, fExtent.y - 5);
        gc.dispose();
        fButton.setImage(fImage);
    }


    /**
   * Activate the editor for this selector. This causes the color selection

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    private ImageData createColorImage(Control w, RGB color) {


        GC gc = new GC(w);
        FontMetrics fm = gc.getFontMetrics();
        int size = fm.getAscent();
        gc.dispose();


        int indent = 6;
        int extent = DEFAULT_EXTENT;
        if (w instanceof Table) {
      extent = ((Table) w).getItemHeight() - 1;

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    GC gc = new GC(item.getParent());


    int maxWidth = item.getImage().getBounds().width * 4;


    if (gc.textExtent(textValue).x < maxWidth) {
      gc.dispose();
      return textValue;
    }


    for (int i = textValue.length(); i > 0; i--) {
      String test = textValue.substring(0, i);

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    for (int i = textValue.length(); i > 0; i--) {
      String test = textValue.substring(0, i);
      test = test + ellipsis;
      if (gc.textExtent(test).x < maxWidth) {
        gc.dispose();
        return test;
      }


    }
    gc.dispose();

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