textareapainter.java

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/*
 * TextAreaPainter.java - Paints the text area
 * Copyright (C) 1999 Slava Pestov
 *
 * 08/05/2002	Cursor (caret) rendering fixed for JDK 1.4 (Anonymous)
 *
 * You may use and modify this package for any purpose. Redistribution is
 * permitted, in both source and binary form, provided that this notice
 * remains intact in all source distributions of this package.
 */

package org.syntax.jedit;

import org.syntax.jedit.tokenmarker.*;
import javax.swing.ToolTipManager;
import javax.swing.text.*;
import javax.swing.JComponent;
import java.awt.event.MouseEvent;
import java.awt.*;

/**
 * The text area repaint manager. It performs double buffering and paints
 * lines of text.
 * @author Slava Pestov
 * @version $Id: TextAreaPainter.java,v 1.2 2003/06/17 14:18:04 gt78 Exp $
 */
public class TextAreaPainter extends JComponent implements TabExpander
{
	/**
	 * Creates a new repaint manager. This should be not be called
	 * directly.
	 */
	public TextAreaPainter(JEditTextArea textArea, TextAreaDefaults defaults)
	{
		this.textArea = textArea;

		setAutoscrolls(true);
		setDoubleBuffered(true);
		setOpaque(true);

		ToolTipManager.sharedInstance().registerComponent(this);

		currentLine = new Segment();
		currentLineIndex = -1;

		setCursor(Cursor.getPredefinedCursor(Cursor.TEXT_CURSOR));

		setFont(new Font("Monospaced",Font.PLAIN,14));
		setForeground(Color.black);
		setBackground(Color.white);

		blockCaret = defaults.blockCaret;
		styles = defaults.styles;
		cols = defaults.cols;
		rows = defaults.rows;
		caretColor = defaults.caretColor;
		selectionColor = defaults.selectionColor;
		lineHighlightColor = defaults.lineHighlightColor;
		lineHighlight = defaults.lineHighlight;
		bracketHighlightColor = defaults.bracketHighlightColor;
		bracketHighlight = defaults.bracketHighlight;
		paintInvalid = defaults.paintInvalid;
		eolMarkerColor = defaults.eolMarkerColor;
		eolMarkers = defaults.eolMarkers;
	}

	/**
	 * Returns if this component can be traversed by pressing the
	 * Tab key. This returns false.
	 */
	public final boolean isManagingFocus()
	{
		return false;
	}

	/**
	 * Returns the syntax styles used to paint colorized text. Entry <i>n</i>
	 * will be used to paint tokens with id = <i>n</i>.
	 * @see org.syntax.jedit.Token
	 */
	public final SyntaxStyle[] getStyles()
	{
		return styles;
	}

	/**
	 * Sets the syntax styles used to paint colorized text. Entry <i>n</i>
	 * will be used to paint tokens with id = <i>n</i>.
	 * @param styles The syntax styles
	 * @see org.syntax.jedit.Token
	 */
	public final void setStyles(SyntaxStyle[] styles)
	{
		this.styles = styles;
		repaint();
	}

	/**
	 * Returns the caret color.
	 */
	public final Color getCaretColor()
	{
		return caretColor;
	}

	/**
	 * Sets the caret color.
	 * @param caretColor The caret color
	 */
	public final void setCaretColor(Color caretColor)
	{
		this.caretColor = caretColor;
		invalidateSelectedLines();
	}

	/**
	 * Returns the selection color.
	 */
	public final Color getSelectionColor()
	{
		return selectionColor;
	}

	/**
	 * Sets the selection color.
	 * @param selectionColor The selection color
	 */
	public final void setSelectionColor(Color selectionColor)
	{
		this.selectionColor = selectionColor;
		invalidateSelectedLines();
	}

	/**
	 * Returns the line highlight color.
	 */
	public final Color getLineHighlightColor()
	{
		return lineHighlightColor;
	}

	/**
	 * Sets the line highlight color.
	 * @param lineHighlightColor The line highlight color
	 */
	public final void setLineHighlightColor(Color lineHighlightColor)
	{
		this.lineHighlightColor = lineHighlightColor;
		invalidateSelectedLines();
	}

	/**
	 * Returns true if line highlight is enabled, false otherwise.
	 */
	public final boolean isLineHighlightEnabled()
	{
		return lineHighlight;
	}

	/**
	 * Enables or disables current line highlighting.
	 * @param lineHighlight True if current line highlight should be enabled,
	 * false otherwise
	 */
	public final void setLineHighlightEnabled(boolean lineHighlight)
	{
		this.lineHighlight = lineHighlight;
		invalidateSelectedLines();
	}

	/**
	 * Returns the bracket highlight color.
	 */
	public final Color getBracketHighlightColor()
	{
		return bracketHighlightColor;
	}

	/**
	 * Sets the bracket highlight color.
	 * @param bracketHighlightColor The bracket highlight color
	 */
	public final void setBracketHighlightColor(Color bracketHighlightColor)
	{
		this.bracketHighlightColor = bracketHighlightColor;
		invalidateLine(textArea.getBracketLine());
	}

	/**
	 * Returns true if bracket highlighting is enabled, false otherwise.
	 * When bracket highlighting is enabled, the bracket matching the
	 * one before the caret (if any) is highlighted.
	 */
	public final boolean isBracketHighlightEnabled()
	{
		return bracketHighlight;
	}

	/**
	 * Enables or disables bracket highlighting.
	 * When bracket highlighting is enabled, the bracket matching the
	 * one before the caret (if any) is highlighted.
	 * @param bracketHighlight True if bracket highlighting should be
	 * enabled, false otherwise
	 */
	public final void setBracketHighlightEnabled(boolean bracketHighlight)
	{
		this.bracketHighlight = bracketHighlight;
		invalidateLine(textArea.getBracketLine());
	}

	/**
	 * Returns true if the caret should be drawn as a block, false otherwise.
	 */
	public final boolean isBlockCaretEnabled()
	{
		return blockCaret;
	}

	/**
	 * Sets if the caret should be drawn as a block, false otherwise.
	 * @param blockCaret True if the caret should be drawn as a block,
	 * false otherwise.
	 */
	public final void setBlockCaretEnabled(boolean blockCaret)
	{
		this.blockCaret = blockCaret;
		invalidateSelectedLines();
	}

	/**
	 * Returns the EOL marker color.
	 */
	public final Color getEOLMarkerColor()
	{
		return eolMarkerColor;
	}

	/**
	 * Sets the EOL marker color.
	 * @param eolMarkerColor The EOL marker color
	 */
	public final void setEOLMarkerColor(Color eolMarkerColor)
	{
		this.eolMarkerColor = eolMarkerColor;
		repaint();
	}

	/**
	 * Returns true if EOL markers are drawn, false otherwise.
	 */
	public final boolean getEOLMarkersPainted()
	{
		return eolMarkers;
	}

	/**
	 * Sets if EOL markers are to be drawn.
	 * @param eolMarkers True if EOL markers should be drawn, false otherwise
	 */
	public final void setEOLMarkersPainted(boolean eolMarkers)
	{
		this.eolMarkers = eolMarkers;
		repaint();
	}

	/**
	 * Returns true if invalid lines are painted as red tildes (~),
	 * false otherwise.
	 */
	public boolean getInvalidLinesPainted()
	{
		return paintInvalid;
	}

	/**
	 * Sets if invalid lines are to be painted as red tildes.
	 * @param paintInvalid True if invalid lines should be drawn, false otherwise
	 */
	public void setInvalidLinesPainted(boolean paintInvalid)
	{
		this.paintInvalid = paintInvalid;
	}

	/**
	 * Adds a custom highlight painter.
	 * @param highlight The highlight
	 */
	public void addCustomHighlight(Highlight highlight)
	{
		highlight.init(textArea,highlights);
		highlights = highlight;
	}

	/**
	 * Highlight interface.
	 */
	public interface Highlight
	{
		/**
		 * Called after the highlight painter has been added.
		 * @param textArea The text area
		 * @param next The painter this one should delegate to
		 */
		void init(JEditTextArea textArea, Highlight next);

		/**
		 * This should paint the highlight and delgate to the
		 * next highlight painter.
		 * @param gfx The graphics context
		 * @param line The line number
		 * @param y The y co-ordinate of the line
		 */
		void paintHighlight(Graphics gfx, int line, int y);

		/**
		 * Returns the tool tip to display at the specified
		 * location. If this highlighter doesn't know what to
		 * display, it should delegate to the next highlight
		 * painter.
		 * @param evt The mouse event
		 */
		String getToolTipText(MouseEvent evt);
	}

	/**
	 * Returns the tool tip to display at the specified location.
	 * @param evt The mouse event
	 */
	public String getToolTipText(MouseEvent evt)
	{
		if(highlights != null)
			return highlights.getToolTipText(evt);
		else
			return null;
	}

	/**
	 * Returns the font metrics used by this component.
	 */
	public FontMetrics getFontMetrics()
	{
		return fm;
	}

	/**
	 * Sets the font for this component. This is overridden to update the
	 * cached font metrics and to recalculate which lines are visible.
	 * @param font The font
	 */