statusbar.java

用java 编写的源码开放的文本编辑器。有很多有用的特性

/*
 * StatusBar.java - The status bar displayed at the bottom of views
 * :tabSize=8:indentSize=8:noTabs=false:
 * :folding=explicit:collapseFolds=1:
 *
 * Copyright (C) 2001, 2002 Slava Pestov
 * Portions copyright (C) 2001 mike dillon
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

package org.gjt.sp.jedit.gui;

//{{{ Imports
import javax.swing.border.*;
import javax.swing.text.Segment;
import javax.swing.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.*;
import org.gjt.sp.jedit.io.*;
import org.gjt.sp.jedit.textarea.*;
import org.gjt.sp.jedit.*;
import org.gjt.sp.util.*;
//}}}

/**
 * The status bar used to display various information to the user.<p>
 *
 * Currently, it is used for the following:
 * <ul>
 * <li>Displaying caret position information
 * <li>Displaying {@link InputHandler#readNextChar(String,String)} prompts
 * <li>Displaying {@link #setMessage(String)} messages
 * <li>Displaying I/O progress
 * <li>Displaying various editor settings
 * <li>Displaying memory status
 * </ul>
 *
 * @version $Id: StatusBar.java,v 1.51 2003/02/08 18:53:02 spestov Exp $
 * @author Slava Pestov
 * @since jEdit 3.2pre2
 */
public class StatusBar extends JPanel implements WorkThreadProgressListener
{
	//{{{ StatusBar constructor
	public StatusBar(View view)
	{
		super(new BorderLayout());
		setBorder(new CompoundBorder(new EmptyBorder(4,0,0,
			(OperatingSystem.isMacOS() ? 18 : 0)),
			UIManager.getBorder("TextField.border")));

		this.view = view;

		panel = new JPanel(new BorderLayout());
		box = new Box(BoxLayout.X_AXIS);
		panel.add(BorderLayout.EAST,box);
		add(BorderLayout.CENTER,panel);

		MouseHandler mouseHandler = new MouseHandler();

		caretStatus = new ToolTipLabel();
		caretStatus.setToolTipText(jEdit.getProperty("view.status.caret-tooltip"));
		caretStatus.addMouseListener(mouseHandler);

		message = new JLabel(" ");
		setMessageComponent(message);

		mode = new ToolTipLabel();
		mode.setToolTipText(jEdit.getProperty("view.status.mode-tooltip"));
		mode.addMouseListener(mouseHandler);

		wrap = new ToolTipLabel();
		wrap.setHorizontalAlignment(SwingConstants.CENTER);
		wrap.setToolTipText(jEdit.getProperty("view.status.wrap-tooltip"));
		wrap.addMouseListener(mouseHandler);

		multiSelect = new ToolTipLabel();
		multiSelect.setHorizontalAlignment(SwingConstants.CENTER);
		multiSelect.setToolTipText(jEdit.getProperty("view.status.multi-tooltip"));
		multiSelect.addMouseListener(mouseHandler);

		overwrite = new ToolTipLabel();
		overwrite.setHorizontalAlignment(SwingConstants.CENTER);
		overwrite.setToolTipText(jEdit.getProperty("view.status.overwrite-tooltip"));
		overwrite.addMouseListener(mouseHandler);

		lineSep = new ToolTipLabel();
		lineSep.setHorizontalAlignment(SwingConstants.CENTER);
		lineSep.setToolTipText(jEdit.getProperty("view.status.linesep-tooltip"));
		lineSep.addMouseListener(mouseHandler);

		memory = new MemoryStatus();
		memory.addMouseListener(mouseHandler);
	} //}}}

	//{{{ propertiesChanged() method
	public void propertiesChanged()
	{
		showCaretStatus = jEdit.getBooleanProperty("view.status.show-caret-status");
		showEditMode = jEdit.getBooleanProperty("view.status.show-edit-mode");
		showFoldMode = jEdit.getBooleanProperty("view.status.show-fold-mode");
		showEncoding = jEdit.getBooleanProperty("view.status.show-encoding");
		showWrap = jEdit.getBooleanProperty("view.status.show-wrap");
		showMultiSelect = jEdit.getBooleanProperty("view.status.show-multi-select");
		showOverwrite = jEdit.getBooleanProperty("view.status.show-overwrite");
		showLineSeperator = jEdit.getBooleanProperty("view.status.show-line-seperator");
		showMemory = jEdit.getBooleanProperty("view.status.show-memory");

		TextAreaPainter painter = view.getTextArea().getPainter();
		panel.setBackground(painter.getBackground());
		panel.setForeground(painter.getForeground());
		caretStatus.setBackground(painter.getBackground());
		caretStatus.setForeground(painter.getForeground());
		message.setBackground(painter.getBackground());
		message.setForeground(painter.getForeground());
		mode.setBackground(painter.getBackground());
		mode.setForeground(painter.getForeground());
		wrap.setBackground(painter.getBackground());
		wrap.setForeground(painter.getForeground());
		multiSelect.setBackground(painter.getBackground());
		multiSelect.setForeground(painter.getForeground());
		overwrite.setBackground(painter.getBackground());
		overwrite.setForeground(painter.getForeground());
		lineSep.setBackground(painter.getBackground());
		lineSep.setForeground(painter.getForeground());
		memory.setBackground(painter.getBackground());
		memory.setForeground(painter.getForeground());

		Font font = UIManager.getFont("Label.font");
		FontMetrics fm = getFontMetrics(font);
		Dimension dim = null;

		if (showCaretStatus)
		{
			panel.add(BorderLayout.WEST,caretStatus);

			caretStatus.setFont(font);

			dim = new Dimension(fm.stringWidth(caretTestStr),
				fm.getHeight());
                        caretStatus.setPreferredSize(dim);
		}
		else
			panel.remove(caretStatus);

		box.removeAll();

		if (showEncoding || showEditMode || showFoldMode)
			box.add(mode);

		if (showWrap)
		{
			dim = new Dimension(Math.max(
				Math.max(fm.charWidth('-'),fm.charWidth('H')),
				fm.charWidth('S')) + 1,fm.getHeight());
			wrap.setPreferredSize(dim);
			wrap.setMaximumSize(dim);
			box.add(wrap);
		}

		if (showMultiSelect)
		{
			dim = new Dimension(
				Math.max(fm.charWidth('-'),fm.charWidth('M')) + 1,
				fm.getHeight());
			multiSelect.setPreferredSize(dim);
			multiSelect.setMaximumSize(dim);
			box.add(multiSelect);
		}

		if (showOverwrite)
		{
			dim = new Dimension(
				Math.max(fm.charWidth('-'),fm.charWidth('O')) + 1,
				fm.getHeight());
			overwrite.setPreferredSize(dim);
			overwrite.setMaximumSize(dim);
			box.add(overwrite);
		}

		if (showLineSeperator)
		{
			dim = new Dimension(Math.max(
				Math.max(fm.charWidth('U'),
				fm.charWidth('W')),
				fm.charWidth('M')) + 1,
				fm.getHeight());
			lineSep.setPreferredSize(dim);
			lineSep.setMaximumSize(dim);
			box.add(lineSep);
		}

		if (showMemory)
		{
			box.add(memory);

			// UI hack because BoxLayout does not give all
			// components the same height

			memory.setFont(font);
			FontRenderContext frc = new FontRenderContext(null,false,false);
			Rectangle2D bounds = font.getStringBounds(memoryTestStr,frc);
			dim = new Dimension((int)bounds.getWidth(),
				(int)bounds.getHeight());
			memory.setPreferredSize(dim);
			memory.setMaximumSize(dim);
			memory.lm = font.getLineMetrics(memoryTestStr,frc);

			memory.progressForeground = jEdit.getColorProperty(
				"view.status.memory.foreground");
			memory.progressBackground = jEdit.getColorProperty(
				"view.status.memory.background");
		}

		updateBufferStatus();
		updateMiscStatus();
	} //}}}

	//{{{ addNotify() method
	public void addNotify()
	{
		super.addNotify();
		VFSManager.getIOThreadPool().addProgressListener(this);
	} //}}}

	//{{{ removeNotify() method
	public void removeNotify()
	{
		super.removeNotify();
		VFSManager.getIOThreadPool().removeProgressListener(this);
	} //}}}

	//{{{ WorkThreadListener implementation

	//{{{ statusUpdate() method
	public void statusUpdate(final WorkThreadPool threadPool, int threadIndex)
	{
		SwingUtilities.invokeLater(new Runnable()
		{
			public void run()
			{
				// don't obscure existing message
				if(message != null && !"".equals(message.getText().trim())
					&& !currentMessageIsIO)
					return;

				int requestCount = threadPool.getRequestCount();
				if(requestCount == 0)
				{
					setMessageAndClear(jEdit.getProperty(
						"view.status.io.done"));
					currentMessageIsIO = true;
				}
				else if(requestCount == 1)
				{
					setMessage(jEdit.getProperty(
						"view.status.io-1"));
					currentMessageIsIO = true;
				}
				else
				{
					Object[] args = { new Integer(requestCount) };
					setMessage(jEdit.getProperty(
						"view.status.io",args));
					currentMessageIsIO = true;
				}
			}
		});
	} //}}}

	//{{{ progressUpdate() method
	public void progressUpdate(WorkThreadPool threadPool, int threadIndex)
	{
	} //}}}

	//}}}

	//{{{ setMessageAndClear() method
	/**
	 * Show a message for a short period of time.
	 * @param message The message
	 * @since jEdit 3.2pre5
	 */
	public void setMessageAndClear(String message)
	{
		setMessage(message);

		tempTimer = new Timer(0,new ActionListener()
		{
			public void actionPerformed(ActionEvent evt)
			{
				// so if view is closed in the meantime...
				if(isShowing())
					setMessage(null);
			}
		});

		tempTimer.setInitialDelay(10000);
		tempTimer.setRepeats(false);
		tempTimer.start();
	} //}}}

	//{{{ setMessage() method
	/**
	 * Displays a status message.
	 */
	public void setMessage(String message)
	{
		if(tempTimer != null)
		{
			tempTimer.stop();
			tempTimer = null;
		}

		setMessageComponent(this.message);

		if(message == null)
		{
			InputHandler inputHandler = view.getInputHandler();
			if(inputHandler.isRepeatEnabled())
			{
				int repeatCount = inputHandler.getRepeatCount();

				this.message.setText(jEdit.getProperty("view.status.repeat",
					new Object[] { repeatCount == 1 ? "" : String.valueOf(repeatCount) }));
			}
			else if(view.getMacroRecorder() != null)
				this.message.setText(jEdit.getProperty("view.status.recording"));
			else
				this.message.setText(" ");
		}
		else
			this.message.setText(message);
	} //}}}

	//{{{ setMessageComponent() method
	public void setMessageComponent(Component comp)
	{
		currentMessageIsIO = false;

		if (comp == null || messageComp == comp)
		{