Make sure that a component can be completely seen on the relevant screen, i.e. - Java Swing

Java examples for Swing:JComponent

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Description

Make sure that a component can be completely seen on the relevant screen, i.e.

Demo Code


import java.awt.Component;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Rectangle;
import org.apache.log4j.Logger;

public class Main{
    private static final Logger LOGGER = Logger
            .getLogger(GraphicsDeviceUtil.class);
    /**//w w  w  . jav a 2 s  .c o  m
     * Make sure that a component can be completely seen on the relevant screen,
     * i.e. makes any necessary adjustments to the component's location. The
     * relevant screen is chosen by which one holds the top left corner point of
     * the given component. Note - if this point is not on any screen, then the
     * default screen is chosen.
     * 
     * @param component
     */
    public static void ensureOnScreen(Component component) {
        Rectangle componentBounds = component.getBounds();
        Rectangle graphicsDeviceBounds = getGraphicsDeviceBounds(component);

        if (graphicsDeviceBounds == null) {
            LOGGER.warn(String
                    .format("Odd! The given component %s is not on any screen! Will use the default screen",
                            component));
            graphicsDeviceBounds = GraphicsEnvironment
                    .getLocalGraphicsEnvironment().getDefaultScreenDevice()
                    .getDefaultConfiguration().getBounds();
        }

        int componentXAdjustment = 0;
        int componentYAdjustment = 0;

        if ((componentBounds.x + componentBounds.width) > (graphicsDeviceBounds.x + graphicsDeviceBounds.width)) {
            componentXAdjustment = (componentBounds.x + componentBounds.width)
                    - (graphicsDeviceBounds.x + graphicsDeviceBounds.width);
        }

        if ((componentBounds.y + componentBounds.height) > (graphicsDeviceBounds.y + graphicsDeviceBounds.height)) {
            componentYAdjustment = (componentBounds.y + componentBounds.height)
                    - (graphicsDeviceBounds.y + graphicsDeviceBounds.height);
        }

        component.setBounds(componentBounds.x - componentXAdjustment,
                componentBounds.y - componentYAdjustment,
                componentBounds.width, componentBounds.height);
    }
    /**
     * Get the bounds (x, y, width, height) of the screen where the given
     * component lies or "null" if not on any screen.
     * 
     * @param component
     * @return
     */
    public static Rectangle getGraphicsDeviceBounds(Component component) {
        Rectangle componentBounds = component.getBounds();

        for (GraphicsDevice graphicsDevice : GraphicsEnvironment
                .getLocalGraphicsEnvironment().getScreenDevices()) {
            for (GraphicsConfiguration graphicsConfiguration : graphicsDevice
                    .getConfigurations()) {
                Rectangle graphicsDeviceBounds = graphicsConfiguration
                        .getBounds();

                if (componentBounds.x >= graphicsDeviceBounds.x
                        && componentBounds.x <= graphicsDeviceBounds.x
                                + graphicsDeviceBounds.width
                        && componentBounds.y >= graphicsDeviceBounds.y
                        && componentBounds.y <= graphicsDeviceBounds.y
                                + graphicsDeviceBounds.height) {
                    return graphicsDeviceBounds;
                }
            }
        }

        LOGGER.warn(String.format(
                "The given component %s is not on any screen!", component));
        return null;
    }
}

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