Java Swing Focus centreInFocusedWindow(Window window, int xOffset, int yOffset)

Description

centre In Focused Window

License

Open Source License

Declaration

public static void centreInFocusedWindow(Window window, int xOffset, int yOffset)

Method Source Code


//package com.java2s;
/* Copyright (C) 2000-2003 The Software Conservancy as Trustee.
 * All rights reserved./*  w ww. ja v  a 2 s  .  c o m*/
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * Nothing in this notice shall be deemed to grant any rights to trademarks,
 * copyrights, patents, trade secrets or any other intellectual property of the
 * licensor or any contributor except as expressly stated herein. No patent
 * license is granted separate from the Software, for code that you delete from
 * the Software, or for combinations of the Software with other software or
 * hardware.
 */

import javax.swing.*;

import java.awt.*;
import java.awt.event.*;

public class Main {
    private static final int TASKBAR_HEIGHT = 30;
    private static Rectangle dirtyScreenSizeWithOutAdjustment;

    public static void centreInFocusedWindow(Container containee) {
        Window focusedWindow = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusedWindow();
        if (focusedWindow != null) {
            Point containingFrameTopLeftHandCorner = focusedWindow.getLocation();
            Dimension containingFrameSize = focusedWindow.getSize();
            Dimension thisFrameSize = containee.getSize();

            int x = (int) (containingFrameTopLeftHandCorner.getX() + (containingFrameSize.width / 2)
                    - (thisFrameSize.width / 2));
            int y = (int) (containingFrameTopLeftHandCorner.getY() + (containingFrameSize.height / 2)
                    - (thisFrameSize.height / 2));

            containee.setLocation(x, y);
        }
    }

    public static void centreInFocusedWindow(Window window, int xOffset, int yOffset) {
        Window focusedWindow = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusedWindow();
        centreInContainer(focusedWindow, window, xOffset, yOffset);
    }

    public static void centreInContainer(Component container, Container containee, int xOffSet, int yOffSet) {
        if (container == null)
            return;
        Point containingFrameTopLeftHandCorner = container.getLocation();
        Dimension containingFrameSize = container.getSize();
        Dimension thisFrameSize = containee.getSize();

        int x = (int) (containingFrameTopLeftHandCorner.getX() + (containingFrameSize.width / 2)
                - (thisFrameSize.width / 2) + xOffSet);
        int y = (int) (containingFrameTopLeftHandCorner.getY() + (containingFrameSize.height / 2)
                - (thisFrameSize.height / 2) + yOffSet);

        containee.setLocation(x, y);
        ensureOnScreen(containee);

        // Prevent problem of always on top window starting a modal child completely hidden and centred beneath it
        if (getFrameParent(container) != null && getFrameParent(container).isAlwaysOnTop()) {
            final JFrame frame = getFrameParent(containee);
            if (frame == null)
                return;
            if (frame.isShowing()) {
                runInDispatchThread(new Runnable() {
                    public void run() {
                        frame.setAlwaysOnTop(true);
                    }
                });
            } else {
                frame.addWindowListener(new WindowAdapter() {
                    public void windowOpened(WindowEvent e) {
                        runInDispatchThread(new Runnable() {
                            public void run() {
                                frame.setAlwaysOnTop(true);
                            }
                        });
                    }

                    public void windowClosing(WindowEvent e) {
                        frame.removeWindowListener(this);
                    }
                });
            }
        }
    }

    public static void ensureOnScreen(Container container) {
        if (container == null)
            return;
        Point containerTopLeftHandCorner = container.getLocation();
        Dimension containerSize = container.getSize();

        Rectangle screenSize = getDefaultScreenSizeWithoutAdjustment();

        int x = containerTopLeftHandCorner.x;
        if (x < 0)
            x = 0;
        if ((x + containerSize.width) > screenSize.width)
            x = screenSize.width - containerSize.width;

        int y = containerTopLeftHandCorner.y;
        if (y < 0)
            y = 0;
        if ((y + containerSize.height + TASKBAR_HEIGHT) > screenSize.height)
            y = screenSize.height - containerSize.height - TASKBAR_HEIGHT;

        container.setLocation(x, y);
    }

    public static JFrame getFrameParent(Component component) {
        Window windowAncestor = getWindowParent(component);
        if (windowAncestor instanceof JFrame)
            return (JFrame) windowAncestor;
        return null;
    }

    public static void runInDispatchThread(Runnable addToGui) {
        if (EventQueue.isDispatchThread()) {
            addToGui.run();
        } else {
            EventQueue.invokeLater(addToGui);
        }
    }

    public static Rectangle getDefaultScreenSizeWithoutAdjustment() {
        return getDefaultScreenSizeWithoutAdjustment(false);
    }

    public static Rectangle getDefaultScreenSizeWithoutAdjustment(boolean useDirty) {
        if (useDirty && dirtyScreenSizeWithOutAdjustment != null)
            return dirtyScreenSizeWithOutAdjustment;

        Rectangle totalBounds = new Rectangle(0, 0);

        GraphicsEnvironment graphicsEnvironment = GraphicsEnvironment.getLocalGraphicsEnvironment(); // to work with multiple screens
        GraphicsDevice[] screenDevices = graphicsEnvironment.getScreenDevices();
        for (GraphicsDevice screenDevice : screenDevices) {
            GraphicsConfiguration graphicsConfiguration = screenDevice.getDefaultConfiguration();
            Rectangle singleScreenBounds = graphicsConfiguration.getBounds();
            totalBounds.width += singleScreenBounds.width;
            totalBounds.height = Math.max(totalBounds.height, singleScreenBounds.height);
        }
        dirtyScreenSizeWithOutAdjustment = totalBounds;
        return totalBounds;
    }

    public static Window getWindowParent(Component component) {
        if (component == null)
            return null;

        if (component instanceof Window) {
            return (Window) component;
        }

        for (Container parent = component.getParent(); parent != null; parent = parent.getParent()) {
            if (parent instanceof Window) {
                return (Window) parent;
            } else if (parent instanceof JPopupMenu) {
                parent = (Container) ((JPopupMenu) parent).getInvoker();
            }
        }

        return null;
    }
}

Java Swing Focus centreInFocusedWindow(Window window, int xOffset, int yOffset)

Description

License

Declaration

Method Source Code

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