syntheditorpaneui.java

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

/*
 * @(#)SynthEditorPaneUI.java	1.10 06/01/24
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.swing.plaf.synth;

import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.BasicEditorPaneUI;
import java.beans.PropertyChangeEvent;
import sun.swing.plaf.synth.SynthUI;

/**
 * Provides the look and feel for a JEditorPane in the
 * Synth look and feel.
 *
 * @author  Shannon Hickey
 * @version 1.10 01/24/06
 */
class SynthEditorPaneUI extends BasicEditorPaneUI implements SynthUI {
    private SynthStyle style;
    /* 
     * I would prefer to use UIResource instad of this. 
     * Unfortunately Boolean is a final class
     */
    private Boolean localTrue = new Boolean(true);
    private Boolean localFalse = new Boolean(false);

    /**
     * Creates a UI for the JTextPane.
     *
     * @param c the JTextPane component
     * @return the UI
     */
    public static ComponentUI createUI(JComponent c) {
        return new SynthEditorPaneUI();
    }

    protected void installDefaults() {
        // Installs the text cursor on the component
        super.installDefaults();
        JComponent c = getComponent();
        Object clientProperty = 
            c.getClientProperty(JEditorPane.HONOR_DISPLAY_PROPERTIES);
        if (clientProperty == null 
            || clientProperty == localFalse) {
            c.putClientProperty(JEditorPane.HONOR_DISPLAY_PROPERTIES,
                                localTrue);
        }
        updateStyle((JTextComponent)getComponent());
    }

    protected void uninstallDefaults() {
        SynthContext context = getContext(getComponent(), ENABLED);
        JComponent c = getComponent();
        c.putClientProperty("caretAspectRatio", null);

        style.uninstallDefaults(context);
        context.dispose();
        style = null;

        Object clientProperty = 
            c.getClientProperty(JEditorPane.HONOR_DISPLAY_PROPERTIES);
        if (clientProperty == localTrue) {
            getComponent().putClientProperty(JEditorPane.HONOR_DISPLAY_PROPERTIES,
                                             Boolean.FALSE);
        }
        super.uninstallDefaults();
    }

    /**
     * This method gets called when a bound property is changed
     * on the associated JTextComponent.  This is a hook
     * which UI implementations may change to reflect how the
     * UI displays bound properties of JTextComponent subclasses.
     * This is implemented to rebuild the ActionMap based upon an
     * EditorKit change.
     *
     * @param evt the property change event
     */
    protected void propertyChange(PropertyChangeEvent evt) {
        if (SynthLookAndFeel.shouldUpdateStyle(evt)) {
            updateStyle((JTextComponent)evt.getSource());
        }
        super.propertyChange(evt);
    }

    private void updateStyle(JTextComponent comp) {
        SynthContext context = getContext(comp, ENABLED);
        SynthStyle oldStyle = style;

        style = SynthLookAndFeel.updateStyle(context, this);

        if (style != oldStyle) {
            SynthTextFieldUI.updateStyle(comp, context, getPropertyPrefix());

            if (oldStyle != null) {
                uninstallKeyboardActions();
                installKeyboardActions();
            }
        }
        context.dispose();
    }

    public SynthContext getContext(JComponent c) {
        return getContext(c, getComponentState(c));
    }

    private SynthContext getContext(JComponent c, int state) {
        return SynthContext.getContext(SynthContext.class, c,
                    SynthLookAndFeel.getRegion(c), style, state);
    }

    private int getComponentState(JComponent c) {
        return SynthLookAndFeel.getComponentState(c);
    }

    public void update(Graphics g, JComponent c) {
        SynthContext context = getContext(c);

        SynthLookAndFeel.update(context, g);
        paintBackground(context, g, c);
        paint(context, g);
        context.dispose();
    }

    protected void paint(SynthContext context, Graphics g) {
        super.paint(g, getComponent());
    }

    protected void paintBackground(Graphics g) {
        // Overriden to do nothing, all our painting is done from update/paint.
    }

    void paintBackground(SynthContext context, Graphics g, JComponent c) {
        context.getPainter().paintEditorPaneBackground(context, g, 0, 0,
                                                  c.getWidth(), c.getHeight());
    }

    public void paintBorder(SynthContext context, Graphics g, int x,
                            int y, int w, int h) {
        context.getPainter().paintEditorPaneBorder(context, g, x, y, w, h);
    }
}