synthtabbedpaneui.java

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

/*
 * @(#)SynthTabbedPaneUI.java	1.42 08/01/28
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.swing.plaf.synth;

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.*;
import javax.swing.text.View;

import java.awt.*;
import java.awt.event.*;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeEvent;
import sun.swing.plaf.synth.SynthUI;
import sun.swing.SwingUtilities2;

/**
 * A Synth L&F implementation of TabbedPaneUI.
 *
 * @version 1.42, 01/28/08
 * @author Scott Violet
 */
/**
 * Looks up 'selectedTabPadInsets' from the Style, which will be additional
 * insets for the selected tab.
 */
class SynthTabbedPaneUI extends BasicTabbedPaneUI implements SynthUI, PropertyChangeListener  {
    /**
     * <p>If non-zero, tabOverlap indicates the amount that the tab bounds
     * should be altered such that they would overlap with a tab on either the
     * leading or trailing end of a run (ie: in TOP, this would be on the left
     * or right).</p>
     * 
     * <p>A positive overlap indicates that tabs should overlap right/down,
     * while a negative overlap indicates tha tabs should overlap left/up.</p>
     * 
     * <p>When tabOverlap is specified, it both changes the x position and width
     * of the tab if in TOP or BOTTOM placement, and changes the y position and
     * height if in LEFT or RIGHT placement.</p>
     * 
     * <p>This is done for the following reason. Consider a run of 10 tabs.
     * There are 9 gaps between these tabs. If you specified a tabOverlap of
     * "-1", then each of the tabs "x" values will be shifted left. This leaves
     * 9 pixels of space to the right of the right-most tab unpainted. So, each
     * tab's width is also extended by 1 pixel to make up the difference.</p>
     * 
     * <p>This property respects the RTL component orientation.</p>
     */
    private int tabOverlap = 0;
    
    /**
     * When a tabbed pane has multiple rows of tabs, this indicates whether
     * the tabs in the upper row(s) should extend to the base of the tab area,
     * or whether they should remain at their normal tab height. This does not
     * affect the bounds of the tabs, only the bounds of area painted by the
     * tabs. The text position does not change. The result is that the bottom
     * border of the upper row of tabs becomes fully obscured by the lower tabs,
     * resulting in a cleaner look.
     */
    private boolean extendTabsToBase = false;
    
    private SynthContext tabAreaContext;
    private SynthContext tabContext;
    private SynthContext tabContentContext;

    private SynthStyle style;
    private SynthStyle tabStyle;
    private SynthStyle tabAreaStyle;
    private SynthStyle tabContentStyle;

    private Rectangle textRect;
    private Rectangle iconRect;
    
    private Rectangle tabAreaBounds = new Rectangle();

    //added for the Nimbus look and feel, where the tab area is painted differently depending on the
    //state for the selected tab
    private boolean tabAreaStatesMatchSelectedTab = false;
    //added for the Nimbus LAF to ensure that the labels don't move whether the tab is selected or not
    private boolean nudgeSelectedLabel = true;

    private boolean selectedTabIsPressed = false;

    public static ComponentUI createUI(JComponent c) {
        return new SynthTabbedPaneUI();
    }

    SynthTabbedPaneUI() {
        textRect = new Rectangle();
        iconRect = new Rectangle();
    }

    private boolean scrollableTabLayoutEnabled() {
	return (tabPane.getTabLayoutPolicy() == JTabbedPane.SCROLL_TAB_LAYOUT);
    }

    protected void installDefaults() {
        updateStyle(tabPane);
    }

    private void updateStyle(JTabbedPane c) {
        SynthContext context = getContext(c, ENABLED);
        SynthStyle oldStyle = style;
        style = SynthLookAndFeel.updateStyle(context, this);
        // Add properties other than JComponent colors, Borders and
        // opacity settings here:
        if (style != oldStyle) {
            tabRunOverlay =
                style.getInt(context, "TabbedPane.tabRunOverlay", 0);
            tabOverlap = style.getInt(context, "TabbedPane.tabOverlap", 0);
            extendTabsToBase = style.getBoolean(context,
                    "TabbedPane.extendTabsToBase", false);
            textIconGap = style.getInt(context, "TabbedPane.textIconGap", 0);
            selectedTabPadInsets = (Insets)style.get(context,
                    "TabbedPane.selectedTabPadInsets");
            if (selectedTabPadInsets == null) {
                selectedTabPadInsets = new Insets(0, 0, 0, 0);
            }
            tabAreaStatesMatchSelectedTab = style.getBoolean(context, 
                    "TabbedPane.tabAreaStatesMatchSelectedTab", false);
            nudgeSelectedLabel = style.getBoolean(context,
                    "TabbedPane.nudgeSelectedLabel", true);
            if (oldStyle != null) {
                uninstallKeyboardActions();
                installKeyboardActions();
            }
        }
        context.dispose();

        if (tabContext != null) {
            tabContext.dispose();
        }
        tabContext = getContext(c, Region.TABBED_PANE_TAB, ENABLED);
        this.tabStyle = SynthLookAndFeel.updateStyle(tabContext, this);
        tabInsets = tabStyle.getInsets(tabContext, null);


        if (tabAreaContext != null) {
            tabAreaContext.dispose();
        }
        tabAreaContext = getContext(c, Region.TABBED_PANE_TAB_AREA, ENABLED);
        this.tabAreaStyle = SynthLookAndFeel.updateStyle(tabAreaContext, this);
        tabAreaInsets = tabAreaStyle.getInsets(tabAreaContext, null);


        if (tabContentContext != null) {
            tabContentContext.dispose();
        }
        tabContentContext = getContext(c, Region.TABBED_PANE_CONTENT, ENABLED);
        this.tabContentStyle = SynthLookAndFeel.updateStyle(tabContentContext,
                                                            this);
        contentBorderInsets =
            tabContentStyle.getInsets(tabContentContext, null);
    }

    protected void installListeners() {
        super.installListeners();
        tabPane.addPropertyChangeListener(this);
    }
    
    protected void uninstallListeners() {
        super.uninstallListeners();
        tabPane.removePropertyChangeListener(this);
    }

    protected void uninstallDefaults() {
        SynthContext context = getContext(tabPane, ENABLED);
        style.uninstallDefaults(context);
        context.dispose();
        style = null;

        tabStyle.uninstallDefaults(tabContext);
        tabContext.dispose();
        tabContext = null;
        tabStyle = null;

        tabAreaStyle.uninstallDefaults(tabAreaContext);
        tabAreaContext.dispose();
        tabAreaContext = null;
        tabAreaStyle = null;

        tabContentStyle.uninstallDefaults(tabContentContext);
        tabContentContext.dispose();
        tabContentContext = null;
        tabContentStyle = null;
    }

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

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

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

    private SynthContext getContext(JComponent c, Region subregion, int state){
        SynthStyle style = null;
        Class klass = SynthContext.class;

        if (subregion == Region.TABBED_PANE_TAB) {
            style = tabStyle;
        }
        else if (subregion == Region.TABBED_PANE_TAB_AREA) {
            style = tabAreaStyle;
        }
        else if (subregion == Region.TABBED_PANE_CONTENT) {
            style = tabContentStyle;
        }
        return SynthContext.getContext(klass, c, subregion, style, state);
    }

    private Region getRegion(JComponent c) {
        return SynthLookAndFeel.getRegion(c);
    }

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

    protected JButton createScrollButton(int direction) {
        // added for Nimbus LAF so that it can use the basic arrow buttons
        // UIManager is queried directly here because this is called before
        // updateStyle is called so the style can not be queried directly
        if (UIManager.getBoolean("TabbedPane.useBasicArrows")) {
            JButton btn = super.createScrollButton(direction);
            btn.setBorder(BorderFactory.createEmptyBorder());
            return btn;
        }
        return new SynthScrollableTabButton(direction);
    }

    public void propertyChange(PropertyChangeEvent e) {
        if (SynthLookAndFeel.shouldUpdateStyle(e)) {
            updateStyle(tabPane);
        }
    }

    /**
     * @inheritDoc
     *
     * Overridden to keep track of whether the selected tab is also pressed.
     */
    @Override
    protected MouseListener createMouseListener() {
        final MouseListener delegate = super.createMouseListener();
        final MouseMotionListener delegate2 = (MouseMotionListener)delegate;
        return new MouseListener() {
            public void mouseClicked(MouseEvent e) { delegate.mouseClicked(e); }
            public void mouseEntered(MouseEvent e) { delegate.mouseEntered(e); }
            public void mouseExited(MouseEvent e) { delegate.mouseExited(e); }

            public void mousePressed(MouseEvent e) {
                if (!tabPane.isEnabled()) {
                    return;
                }

                int tabIndex = tabForCoordinate(tabPane, e.getX(), e.getY());
                if (tabIndex >= 0 && tabPane.isEnabledAt(tabIndex)) {
                    if (tabIndex == tabPane.getSelectedIndex()) {
                        // Clicking on selected tab
                        selectedTabIsPressed = true;
                        //TODO need to just repaint the tab area!
                        tabPane.repaint();
                    }
                }