JDK14/Java14源码在线阅读

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 * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package javax.swing.plaf.synth;

import java.awt.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.*;
import javax.swing.plaf.basic.BasicHTML;
import javax.swing.plaf.basic.BasicToolTipUI;
import javax.swing.plaf.ComponentUI;
import javax.swing.text.View;

import sun.swing.SwingUtilities2;

/**
 * Provides the Synth L&F UI delegate for
 * {@link javax.swing.JToolTip}.
 *
 * @author Joshua Outwater
 * @since 1.7
 */
public class SynthToolTipUI extends BasicToolTipUI
                            implements PropertyChangeListener, SynthUI {
    private SynthStyle style;

    /**
     * Creates a new UI object for the given component.
     *
     * @param c component to create UI object for
     * @return the UI object
     */
    public static ComponentUI createUI(JComponent c) {
        return new SynthToolTipUI();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void installDefaults(JComponent c) {
        updateStyle(c);
    }

    private void updateStyle(JComponent c) {
        SynthContext context = getContext(c, ENABLED);
        style = SynthLookAndFeel.updateStyle(context, this);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallDefaults(JComponent c) {
        SynthContext context = getContext(c, ENABLED);
        style.uninstallDefaults(context);
        style = null;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void installListeners(JComponent c) {
        c.addPropertyChangeListener(this);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallListeners(JComponent c) {
        c.removePropertyChangeListener(this);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public SynthContext getContext(JComponent c) {
        return getContext(c, getComponentState(c));
    }

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

    private int getComponentState(JComponent c) {
        JComponent comp = ((JToolTip)c).getComponent();

        if (comp != null && !comp.isEnabled()) {
            return DISABLED;
        }
        return SynthLookAndFeel.getComponentState(c);
    }

    /**
     * Notifies this UI delegate to repaint the specified component.
     * This method paints the component background, then calls
     * the {@link #paint(SynthContext,Graphics)} method.
     *
     * <p>In general, this method does not need to be overridden by subclasses.
     * All Look and Feel rendering code should reside in the {@code paint} method.
     *
     * @param g the {@code Graphics} object used for painting
     * @param c the component being painted
     * @see #paint(SynthContext,Graphics)
     */
    @Override
    public void update(Graphics g, JComponent c) {
        SynthContext context = getContext(c);

        SynthLookAndFeel.update(context, g);
        context.getPainter().paintToolTipBackground(context,
                          g, 0, 0, c.getWidth(), c.getHeight());
        paint(context, g);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void paintBorder(SynthContext context, Graphics g, int x,
                            int y, int w, int h) {
        context.getPainter().paintToolTipBorder(context, g, x, y, w, h);
    }

    /**
     * Paints the specified component according to the Look and Feel.
     * <p>This method is not used by Synth Look and Feel.
     * Painting is handled by the {@link #paint(SynthContext,Graphics)} method.
     *
     * @param g the {@code Graphics} object used for painting
     * @param c the component being painted
     * @see #paint(SynthContext,Graphics)
     */
    @Override
    public void paint(Graphics g, JComponent c) {
        SynthContext context = getContext(c);

        paint(context, g);
    }

    /**
     * Paints the specified component.
     *
     * @param context context for the component being painted
     * @param g the {@code Graphics} object used for painting
     * @see #update(Graphics,JComponent)
     */
    protected void paint(SynthContext context, Graphics g) {
        JToolTip tip = (JToolTip)context.getComponent();

        Insets insets = tip.getInsets();
        View v = (View)tip.getClientProperty(BasicHTML.propertyKey);
        if (v != null) {
            Rectangle paintTextR = new Rectangle(insets.left, insets.top,
                  tip.getWidth() - (insets.left + insets.right),
                  tip.getHeight() - (insets.top + insets.bottom));
            v.paint(g, paintTextR);
        } else {
            g.setColor(context.getStyle().getColor(context,
                                                   ColorType.TEXT_FOREGROUND));
            g.setFont(style.getFont(context));
            context.getStyle().getGraphicsUtils(context).paintText(
                context, g, tip.getTipText(), insets.left, insets.top, -1);
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Dimension getPreferredSize(JComponent c) {
        SynthContext context = getContext(c);
        Insets insets = c.getInsets();
        Dimension prefSize = new Dimension(insets.left+insets.right,
                                           insets.top+insets.bottom);
        String text = ((JToolTip)c).getTipText();

        if (text != null) {
            View v = (c != null) ? (View) c.getClientProperty("html") : null;
            if (v != null) {
                prefSize.width += (int) v.getPreferredSpan(View.X_AXIS);
                prefSize.height += (int) v.getPreferredSpan(View.Y_AXIS);
            } else {
                Font font = context.getStyle().getFont(context);
                FontMetrics fm = c.getFontMetrics(font);
                prefSize.width += context.getStyle().getGraphicsUtils(context).
                                  computeStringWidth(context, font, fm, text);
                prefSize.height += fm.getHeight();

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