Window.java 文件源码

/**
 * Given the desired position of the window, this method returns an adjusted
 * position such that the window is no larger than its monitor, and does not
 * extend beyond the edge of the monitor. This is used for computing the
 * initial window position, and subclasses can use this as a utility method
 * if they want to limit the region in which the window may be moved.
 * 
 * @param preferredSize
 *            the preferred position of the window
 * @return a rectangle as close as possible to preferredSize that does not
 *         extend outside the monitor
 * 
 * @since 3.0
 */
protected Rectangle getConstrainedShellBounds(Rectangle preferredSize) {
    Rectangle result = new Rectangle(preferredSize.x, preferredSize.y,
            preferredSize.width, preferredSize.height);

    Monitor mon = getClosestMonitor(getShell().getDisplay(), Geometry
            .centerPoint(result));

    Rectangle bounds = mon.getClientArea();

    if (result.height > bounds.height) {
        result.height = bounds.height;
    }

    if (result.width > bounds.width) {
        result.width = bounds.width;
    }

    result.x = Math.max(bounds.x, Math.min(result.x, bounds.x
            + bounds.width - result.width));
    result.y = Math.max(bounds.y, Math.min(result.y, bounds.y
            + bounds.height - result.height));

    return result;
}