mirror of
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277 lines
8.2 KiB
Java
277 lines
8.2 KiB
Java
/* MetalToolTipUI.java
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.swing.plaf.metal;
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import java.awt.Color;
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import java.awt.Dimension;
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import java.awt.Font;
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import java.awt.FontMetrics;
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import java.awt.Graphics;
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import java.awt.event.InputEvent;
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import java.awt.event.KeyEvent;
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import javax.swing.AbstractButton;
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import javax.swing.JComponent;
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import javax.swing.JMenuItem;
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import javax.swing.JToolTip;
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import javax.swing.KeyStroke;
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import javax.swing.UIManager;
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import javax.swing.border.Border;
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import javax.swing.plaf.ComponentUI;
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import javax.swing.plaf.UIResource;
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import javax.swing.plaf.basic.BasicToolTipUI;
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/**
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* A UI delegate for the {@link JToolTip} component.
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*/
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public class MetalToolTipUI
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extends BasicToolTipUI
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{
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/**
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* The amount of space between the tool tip text and the accelerator
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* description (if visible).
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*/
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public static final int padSpaceBetweenStrings = 12;
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/** The shared UI instance. */
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private static MetalToolTipUI instance;
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/** A flag controlling the visibility of the accelerator (if there is one). */
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private boolean isAcceleratorHidden;
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/** A string representing the accelerator key for the component. */
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private String acceleratorString;
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/**
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* The delimiter for the accelerator string.
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*/
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private String acceleratorDelimiter;
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/** The font for the accelerator string. */
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private Font acceleratorFont;
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/** The color for the accelerator string. */
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private Color acceleratorForeground;
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/** The active border. */
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private Border activeBorder;
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/** The inactive border. */
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private Border inactiveBorder;
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/**
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* Constructs a new instance of <code>MetalToolTipUI</code>.
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*/
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public MetalToolTipUI()
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{
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super();
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activeBorder = UIManager.getBorder("ToolTip.border");
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inactiveBorder = UIManager.getBorder("ToolTip.borderInactive");
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isAcceleratorHidden = UIManager.getBoolean("ToolTip.hideAccelerator");
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acceleratorFont = UIManager.getFont("MenuItem.acceleratorFont");
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acceleratorForeground = UIManager.getColor("MenuItem.acceleratorForeground");
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acceleratorDelimiter = UIManager.getString("MenuItem.acceleratorDelimiter");
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}
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/**
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* Returns a shared instance of the <code>MetalToolTipUI</code> class.
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* Although this UI delegate does maintain state information, there is never
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* more than one tool tip visible, so it is OK to use a shared instance.
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*
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* @param component the component (a {@link JToolTip}).
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*
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* @return A shared instance of the <code>MetalToolTipUI</code> class.
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*/
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public static ComponentUI createUI(JComponent component)
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{
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if (instance == null)
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instance = new MetalToolTipUI();
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return instance;
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}
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/**
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* Returns a string representing the accelerator key (if there is one) for
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* the component that the tool tip belongs to.
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*
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* @return A string representing the accelerator key.
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*/
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public String getAcceleratorString()
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{
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return acceleratorString;
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}
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/**
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* Installs the UI for the specified component (a {@link JToolTip}).
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*
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* @param c the {@link JToolTip} component.
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*/
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public void installUI(JComponent c)
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{
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super.installUI(c);
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Border existingBorder = c.getBorder();
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if (existingBorder == null || existingBorder instanceof UIResource)
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{
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if (c.isEnabled())
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c.setBorder(activeBorder);
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else
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c.setBorder(inactiveBorder);
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}
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}
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/**
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* Clears the defaults set in {@link #installUI(JComponent)}.
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*
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* @param c the component.
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*/
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public void uninstallUI(JComponent c)
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{
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super.uninstallUI(c);
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if (c.getBorder() instanceof UIResource)
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c.setBorder(null);
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}
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/**
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* Returns <code>true</code> if the accelerator string is hidden, and
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* <code>false</code> otherwise. This setting is controlled by the
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* <code>ToolTip.hideAccelerator</code> entry in the UI defaults table.
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*
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* @return A boolean.
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*/
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protected boolean isAcceleratorHidden()
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{
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return isAcceleratorHidden;
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}
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/**
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* Returns the preferred size for the {@link JToolTip} component.
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*
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* @param c the component (a {@link JToolTip}).
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*
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* @return The preferred size.
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*/
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public Dimension getPreferredSize(JComponent c)
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{
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Dimension d = super.getPreferredSize(c);
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String acc = getAcceleratorString();
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if (acc != null && ! acc.equals(""))
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{
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FontMetrics fm = c.getFontMetrics(c.getFont());
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d.width += fm.stringWidth(acc);
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}
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return d;
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}
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/**
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* Paints the tool tip.
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*
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* @param g the graphics context.
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* @param c the {@link JToolTip} component.
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*/
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public void paint(Graphics g, JComponent c)
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{
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super.paint(g, c);
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// Somehow paint accelerator. Keep care for possible HTML rendering.
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}
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/**
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* Returns a string representing the accelerator for the component, or
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* <code>null</code> if the component has no accelerator.
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*
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* @param c the component.
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*
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* @return A string representing the accelerator (possibly
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* <code>null</code>).
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*/
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private String fetchAcceleratorString(JComponent c)
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{
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String result = null;
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if (c instanceof JToolTip)
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{
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JToolTip toolTip = (JToolTip) c;
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JComponent component = toolTip.getComponent();
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KeyStroke ks = null;
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int mne = 0;
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if (component instanceof JMenuItem)
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{
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JMenuItem item = (JMenuItem) component;
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ks = item.getAccelerator();
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if (ks == null)
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mne = item.getMnemonic();
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}
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else if (component instanceof AbstractButton)
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{
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AbstractButton button = (AbstractButton) component;
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mne = button.getMnemonic();
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}
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if (mne > 0)
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ks = KeyStroke.getKeyStroke(Character.toUpperCase((char) mne),
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InputEvent.ALT_MASK, false);
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if (ks != null)
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result = acceleratorToString(ks);
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}
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return result;
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}
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/**
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* Returns a string representing an accelerator.
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*
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* @param accelerator the accelerator (<code>null</code> not permitted).
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*
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* @return A string representing an accelerator.
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*/
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private String acceleratorToString(KeyStroke accelerator)
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{
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// convert keystroke into string format
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String modifiersText = "";
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int modifiers = accelerator.getModifiers();
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char keyChar = accelerator.getKeyChar();
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int keyCode = accelerator.getKeyCode();
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if (modifiers != 0)
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modifiersText = KeyEvent.getKeyModifiersText(modifiers)
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+ acceleratorDelimiter;
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if (keyCode == KeyEvent.VK_UNDEFINED)
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return modifiersText + keyChar;
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else
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return modifiersText + KeyEvent.getKeyText(keyCode);
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}
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}
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