metaltitlepane.java

Mobile 应用程序使用 Java Micro Edition (Java ME) 平台

/*
 * @(#)MetalTitlePane.java	1.22 06/07/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.swing.plaf.metal;

import sun.swing.SwingUtilities2;
import sun.awt.SunToolkit;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.InternalFrameEvent;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.*;
import java.util.Locale;
import javax.accessibility.*;


/**
 * Class that manages a JLF awt.Window-descendant class's title bar.  
 * <p>
 * This class assumes it will be created with a particular window
 * decoration style, and that if the style changes, a new one will
 * be created.
 *
 * @version 1.22 07/17/06
 * @author Terry Kellerman
 * @since 1.4
 */
class MetalTitlePane extends JComponent {
    private static final Border handyEmptyBorder = new EmptyBorder(0,0,0,0);
    private static final int IMAGE_HEIGHT = 16;
    private static final int IMAGE_WIDTH = 16;

    /**
     * PropertyChangeListener added to the JRootPane.
     */
    private PropertyChangeListener propertyChangeListener;

    /**
     * JMenuBar, typically renders the system menu items.
     */
    private JMenuBar menuBar;
    /**
     * Action used to close the Window.
     */
    private Action closeAction;

    /**
     * Action used to iconify the Frame.
     */
    private Action iconifyAction;

    /**
     * Action to restore the Frame size.
     */
    private Action restoreAction;

    /**
     * Action to restore the Frame size.
     */
    private Action maximizeAction;

    /**
     * Button used to maximize or restore the Frame.
     */
    private JButton toggleButton;

    /**
     * Button used to maximize or restore the Frame.
     */
    private JButton iconifyButton;

    /**
     * Button used to maximize or restore the Frame.
     */
    private JButton closeButton;

    /**
     * Icon used for toggleButton when window is normal size.
     */
    private Icon maximizeIcon;

    /**
     * Icon used for toggleButton when window is maximized.
     */
    private Icon minimizeIcon;

    /**
     * Image used for the system menu icon
     */
    private Image systemIcon;

    /**
     * Listens for changes in the state of the Window listener to update
     * the state of the widgets.
     */
    private WindowListener windowListener;

    /**
     * Window we're currently in.
     */
    private Window window;

    /**
     * JRootPane rendering for.
     */
    private JRootPane rootPane;

    /**
     * Room remaining in title for bumps.
     */
    private int buttonsWidth;

    /**
     * Buffered Frame.state property. As state isn't bound, this is kept
     * to determine when to avoid updating widgets.
     */
    private int state;

    /**
     * MetalRootPaneUI that created us.
     */
    private MetalRootPaneUI rootPaneUI;
    

    // Colors
    private Color inactiveBackground = UIManager.getColor("inactiveCaption");
    private Color inactiveForeground = UIManager.getColor("inactiveCaptionText");
    private Color inactiveShadow = UIManager.getColor("inactiveCaptionBorder");
    private Color activeBumpsHighlight = MetalLookAndFeel.getPrimaryControlHighlight();
    private Color activeBumpsShadow = MetalLookAndFeel.getPrimaryControlDarkShadow();
    private Color activeBackground = null;
    private Color activeForeground = null;
    private Color activeShadow = null;

    // Bumps
    private MetalBumps activeBumps 
        = new MetalBumps( 0, 0,
                          activeBumpsHighlight,
                          activeBumpsShadow,
                          MetalLookAndFeel.getPrimaryControl() );
    private MetalBumps inactiveBumps 
        = new MetalBumps( 0, 0,
                          MetalLookAndFeel.getControlHighlight(),
                          MetalLookAndFeel.getControlDarkShadow(),
                          MetalLookAndFeel.getControl() );


    public MetalTitlePane(JRootPane root, MetalRootPaneUI ui) {
        this.rootPane = root;
        rootPaneUI = ui;

        state = -1;

        installSubcomponents();
        determineColors();
        installDefaults();

        setLayout(createLayout());
    }

    /**
     * Uninstalls the necessary state.
     */
    private void uninstall() {
        uninstallListeners();
        window = null;
        removeAll();
    }

    /**
     * Installs the necessary listeners.
     */
    private void installListeners() {
        if (window != null) {
            windowListener = createWindowListener();
            window.addWindowListener(windowListener);
            propertyChangeListener = createWindowPropertyChangeListener();
            window.addPropertyChangeListener(propertyChangeListener);
        }
    }

    /**
     * Uninstalls the necessary listeners.
     */
    private void uninstallListeners() {
        if (window != null) {
            window.removeWindowListener(windowListener);
            window.removePropertyChangeListener(propertyChangeListener);
        }
    }

    /**
     * Returns the <code>WindowListener</code> to add to the
     * <code>Window</code>.
     */
    private WindowListener createWindowListener() {
        return new WindowHandler();
    }

    /**
     * Returns the <code>PropertyChangeListener</code> to install on
     * the <code>Window</code>.
     */
    private PropertyChangeListener createWindowPropertyChangeListener() {
        return new PropertyChangeHandler();
    }

    /**
     * Returns the <code>JRootPane</code> this was created for.
     */
    public JRootPane getRootPane() {
        return rootPane;
    }

    /**
     * Returns the decoration style of the <code>JRootPane</code>.
     */
    private int getWindowDecorationStyle() {
        return getRootPane().getWindowDecorationStyle();
    }

    public void addNotify() {
        super.addNotify();

        uninstallListeners();

        window = SwingUtilities.getWindowAncestor(this);
        if (window != null) {
            if (window instanceof Frame) {
                setState(((Frame)window).getExtendedState());
            }
            else {
                setState(0);
            }
            setActive(window.isActive());
            installListeners();
            updateSystemIcon();
        }
    }

    public void removeNotify() {
        super.removeNotify();

        uninstallListeners();
        window = null;
    }

    /**
     * Adds any sub-Components contained in the <code>MetalTitlePane</code>.
     */
    private void installSubcomponents() {
        int decorationStyle = getWindowDecorationStyle();
        if (decorationStyle == JRootPane.FRAME) {
            createActions();
            menuBar = createMenuBar();
            add(menuBar);
            createButtons();
            add(iconifyButton);
            add(toggleButton);
            add(closeButton);
        } else if (decorationStyle == JRootPane.PLAIN_DIALOG ||
                decorationStyle == JRootPane.INFORMATION_DIALOG ||
                decorationStyle == JRootPane.ERROR_DIALOG ||
                decorationStyle == JRootPane.COLOR_CHOOSER_DIALOG ||
                decorationStyle == JRootPane.FILE_CHOOSER_DIALOG ||
                decorationStyle == JRootPane.QUESTION_DIALOG ||
                decorationStyle == JRootPane.WARNING_DIALOG) {
            createActions();
            createButtons();
            add(closeButton);
        }
    }

    /**
     * Determines the Colors to draw with.
     */
    private void determineColors() {
        switch (getWindowDecorationStyle()) {
        case JRootPane.FRAME:
            activeBackground = UIManager.getColor("activeCaption");
            activeForeground = UIManager.getColor("activeCaptionText");
            activeShadow = UIManager.getColor("activeCaptionBorder");
            break;
        case JRootPane.ERROR_DIALOG:
            activeBackground = UIManager.getColor(
                "OptionPane.errorDialog.titlePane.background");
            activeForeground = UIManager.getColor(
                "OptionPane.errorDialog.titlePane.foreground");
            activeShadow = UIManager.getColor(
                "OptionPane.errorDialog.titlePane.shadow");
            break;
        case JRootPane.QUESTION_DIALOG:
        case JRootPane.COLOR_CHOOSER_DIALOG:
        case JRootPane.FILE_CHOOSER_DIALOG:
            activeBackground = UIManager.getColor(
                "OptionPane.questionDialog.titlePane.background");
            activeForeground = UIManager.getColor(
                "OptionPane.questionDialog.titlePane.foreground");
            activeShadow = UIManager.getColor(
                "OptionPane.questionDialog.titlePane.shadow");
            break;
        case JRootPane.WARNING_DIALOG:
            activeBackground = UIManager.getColor(
                "OptionPane.warningDialog.titlePane.background");
            activeForeground = UIManager.getColor(
                "OptionPane.warningDialog.titlePane.foreground");
            activeShadow = UIManager.getColor(
                "OptionPane.warningDialog.titlePane.shadow");
            break;
        case JRootPane.PLAIN_DIALOG:
        case JRootPane.INFORMATION_DIALOG:
        default:
            activeBackground = UIManager.getColor("activeCaption");
            activeForeground = UIManager.getColor("activeCaptionText");
            activeShadow = UIManager.getColor("activeCaptionBorder");
            break;
        }
        activeBumps.setBumpColors(activeBumpsHighlight, activeBumpsShadow,
                                  activeBackground);
    }

    /**
     * Installs the fonts and necessary properties on the MetalTitlePane.
     */
    private void installDefaults() {
        setFont(UIManager.getFont("InternalFrame.titleFont", getLocale()));
    }
    
    /**
     * Uninstalls any previously installed UI values.
     */
    private void uninstallDefaults() {
    }

    /**