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RSyntaxTextArea is the syntax highlighting text editor for Swing applications. Features include syntax highlighting for 40+ languages, code folding, code completion, regex find and replace, macros, code templates, undo/redo, line numbering and bracket matching.
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/*
* 10/08/2011
*
* FoldIndicator.java - Gutter component allowing the user to expand and
* collapse folds.
*
* This library is distributed under a modified BSD license. See the included
* LICENSE file for details.
*/
package org.fife.ui.rtextarea;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.*;
import javax.swing.event.DocumentEvent;
import javax.swing.event.MouseInputAdapter;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.Element;
import javax.swing.text.View;
import org.fife.ui.rsyntaxtextarea.RSyntaxTextArea;
import org.fife.ui.rsyntaxtextarea.Token;
import org.fife.ui.rsyntaxtextarea.focusabletip.TipUtil;
import org.fife.ui.rsyntaxtextarea.folding.Fold;
import org.fife.ui.rsyntaxtextarea.folding.FoldManager;
/**
* Component in the gutter that displays +/- icons to expand and collapse
* fold regions in the editor.
*
* @author Robert Futrell
* @version 1.0
*/
public class FoldIndicator extends AbstractGutterComponent {
/**
* Used in {@link #paintComponent(Graphics)} to prevent reallocation on
* each paint.
*/
private Insets textAreaInsets;
/**
* Used in {@link #paintComponent(Graphics)} to prevent reallocation on
* each paint.
*/
private Rectangle visibleRect;
/**
* The fold to show the outline line for.
*/
private Fold foldWithOutlineShowing;
/**
* The color used for the foreground of armed folds.
*/
private Color armedForeground;
/**
* The color to use for fold icon backgrounds, if the default icons
* are used.
*/
private Color foldIconBackground;
/**
* The color to use for armed fold icon backgrounds, if the default icons
* are used. This may be {@code null}.
*/
private Color foldIconArmedBackground;
/**
* The icon used for collapsed folds.
*/
private FoldIndicatorIcon collapsedFoldIcon;
/**
* The icon used for expanded folds.
*/
private FoldIndicatorIcon expandedFoldIcon;
/**
* Used while painting; global flag to denote whether the mouse is over
* a fold indicator.
*/
private boolean mouseOverFoldIcon;
/**
* Used while painting; global flag to denote whether the
* currently-being-painted fold should be rendered as armed.
*/
private boolean paintFoldArmed;
/**
* Whether tool tips are displayed showing the contents of collapsed
* fold regions.
*/
private boolean showFoldRegionTips;
/**
* Whether the range of lines covered by an expanded, armed fold icon
* should be visually shown.
*/
private boolean showArmedFoldRange;
/**
* Optional additional left margin.
*/
private int additionalLeftMargin;
/**
* The strategy to use when rendering expanded folds.
*/
private ExpandedFoldRenderStrategy expandedFoldRenderStrategy;
/**
* The color used to paint fold outlines.
*/
public static final Color DEFAULT_FOREGROUND = Color.GRAY;
/**
* The default color used to paint the "inside" of fold icons.
*/
public static final Color DEFAULT_FOLD_BACKGROUND = Color.WHITE;
/**
* The alpha used for "collapsed" fold icons.
*/
private float collapsedFoldIconAlpha;
/**
* Used to update the collapsed fold icons' alpha value on a timer.
*/
private AlphaRunnable alphaRunnable;
/**
* The timer used to update collapsed fold icons' alpha.
*/
private Timer timer;
/**
* Listens for events in this component.
*/
private Listener listener;
private static final int COLLAPSED_FOLD_ALPHA_DELAY_MILLIS = 16;
private static final float ALPHA_DELTA = 0.1f;
public FoldIndicator(RTextArea textArea) {
super(textArea);
}
/**
* Overridden to use the editor's background if it's detected that the
* user isn't using white as the editor bg, but the system's tool tip
* background is yellow-ish.
*
* @return The tool tip.
*/
@Override
public JToolTip createToolTip() {
JToolTip tip = super.createToolTip();
tip.setBackground(TipUtil.getToolTipBackground(textArea));
tip.setBorder(TipUtil.getToolTipBorder(textArea));
return tip;
}
/**
* Returns the amount of additional size to give the left margin of this
* component. This can be used to add blank space between this component
* and the line number indicator in the gutter.
*
* @return The additional left margin.
* @see #setAdditionalLeftMargin(int)
*/
public int getAdditionalLeftMargin() {
return additionalLeftMargin;
}
private Fold findOpenFoldClosestTo(Point p) {
Fold fold = null;
mouseOverFoldIcon = false;
RSyntaxTextArea rsta = (RSyntaxTextArea)textArea;
if (rsta.isCodeFoldingEnabled()) { // Should always be true
int offs = rsta.viewToModel(p); // TODO: Optimize me
if (offs>-1) {
try {
int line = rsta.getLineOfOffset(offs);
FoldManager fm = rsta.getFoldManager();
fold = fm.getFoldForLine(line);
if (fold != null) {
// The mouse is directly over the fold indicator
mouseOverFoldIcon = true;
}
else {
fold = fm.getDeepestOpenFoldContaining(offs);
}
} catch (BadLocationException ble) {
ble.printStackTrace(); // Never happens
}
}
}
return fold;
}
/**
* Returns the foreground color used for armed folds.
*
* @return The foreground color used for armed folds.
* @see #setArmedForeground(Color)
*/
public Color getArmedForeground() {
return armedForeground;
}
/**
* Returns the strategy to use for rendering expanded folds.
*
* @return The strategy to use for rendering expanded folds.
* @see #setExpandedFoldRenderStrategy(ExpandedFoldRenderStrategy)
*/
public ExpandedFoldRenderStrategy getExpandedFoldRenderStrategy() {
return expandedFoldRenderStrategy;
}
/**
* Returns the color to use for the "background" of armed fold icons. This
* is ignored if custom icons are used.
*
* @return The background color. If this is {@code null}, there is no
* special color for armed fold icons.
* @see #setFoldIconArmedBackground(Color)
* @see #getFoldIconBackground()
*/
public Color getFoldIconArmedBackground() {
return foldIconArmedBackground;
}
/**
* Returns the color to use for the "background" of fold icons. This
* is ignored if custom icons are used.
*
* @return The background color.
* @see #setFoldIconBackground(Color)
* @see #getFoldIconArmedBackground()
*/
public Color getFoldIconBackground() {
return foldIconBackground;
}
/**
* Returns whether to paint expanded folds.
*
* @return Whether to paint expanded folds.
*/
private boolean getPaintExpandedFolds() {
return expandedFoldRenderStrategy == ExpandedFoldRenderStrategy.ALWAYS || collapsedFoldIconAlpha > 0;
}
@Override
public Dimension getPreferredSize() {
int iconWidth = Math.max(expandedFoldIcon.getIconWidth(), collapsedFoldIcon.getIconWidth());
int h = textArea!=null ? textArea.getHeight() : 100; // Arbitrary
return new Dimension(iconWidth + 4 + additionalLeftMargin, h);
}
/**
* Returns whether a line should be drawn to show the range of lines contained
* in an expanded fold when it is armed (hovered over).
*
* @return Whether to show an armed fold's range.
* @see #setShowArmedFoldRange(boolean)
*/
public boolean getShowArmedFoldRange() {
return showArmedFoldRange;
}
/**
* Returns whether tool tips are displayed showing the contents of
* collapsed fold regions when the mouse hovers over a +/- icon.
*
* @return Whether these tool tips are displayed.
* @see #setShowCollapsedRegionToolTips(boolean)
*/
public boolean getShowCollapsedRegionToolTips() {
return showFoldRegionTips;
}
/**
* Positions tool tips to be aligned in the text component, so that the
* displayed content is shown (almost) exactly where it would be in the
* editor.
*
* @param e The mouse location.
*/
@Override
public Point getToolTipLocation(MouseEvent e) {
// ToolTipManager requires both location and text to be null to hide
// a currently-visible tool tip window. If text is null but location
// has some value, it will show a tool tip with empty content, the size
// of its border (!).
String text = getToolTipText(e);
if (text==null) {
return null;
}
// Try to overlap the tip's text directly over the code
Point p = e.getPoint();
p.y = (p.y/textArea.getLineHeight()) * textArea.getLineHeight();
p.x = getWidth() + textArea.getMargin().left;
Gutter gutter = getGutter();
int gutterMargin = gutter.getInsets().right;
p.x += gutterMargin;
JToolTip tempTip = createToolTip();
p.x -= tempTip.getInsets().left;
p.y += 16;
return p;
}
/**
* Overridden to show the content of a collapsed fold on mouse-overs.
*
* @param e The mouse location.
*/
@Override
public String getToolTipText(MouseEvent e) {
String text = null;
RSyntaxTextArea rsta = (RSyntaxTextArea)textArea;
if (rsta.isCodeFoldingEnabled()) {
FoldManager fm = rsta.getFoldManager();
int pos = rsta.viewToModel(new Point(0, e.getY()));
if (pos>=0) { // Not -1
int line;
try {
line = rsta.getLineOfOffset(pos);
} catch (BadLocationException ble) {
ble.printStackTrace(); // Never happens
return null;
}
Fold fold = fm.getFoldForLine(line);
if (fold!=null && fold.isCollapsed()) {
int endLine = fold.getEndLine();
if (fold.getLineCount()>25) { // Not too big
endLine = fold.getStartLine() + 25;
}
StringBuilder sb = new StringBuilder("");
while (line<=endLine && line");
line++;
}
text = sb.toString();
}
}
}
return text;
}
void gutterArmedUpdate(boolean armed) {
if (expandedFoldRenderStrategy == ExpandedFoldRenderStrategy.ON_HOVER) {
alphaRunnable.delta = armed ? ALPHA_DELTA : -ALPHA_DELTA;
timer.restart();
}
else {
collapsedFoldIconAlpha = 1;
timer.stop();
repaint();
}
}
@Override
void handleDocumentEvent(DocumentEvent e) {
int newLineCount = textArea.getLineCount();
if (newLineCount!=currentLineCount) {
currentLineCount = newLineCount;
repaint();
}
}
@Override
protected void init() {
super.init();
setForeground(DEFAULT_FOREGROUND);
setFoldIconBackground(DEFAULT_FOLD_BACKGROUND);
setStyle(FoldIndicatorStyle.MODERN);
listener = new Listener(this);
visibleRect = new Rectangle();
setShowCollapsedRegionToolTips(true);
alphaRunnable = new AlphaRunnable();
timer = new Timer(COLLAPSED_FOLD_ALPHA_DELAY_MILLIS, alphaRunnable);
timer.setRepeats(true);
}
@Override
void lineHeightsChanged() {
// TODO Auto-generated method stub
}
@Override
protected void paintComponent(Graphics g) {
if (textArea==null) {
return;
}
visibleRect = g.getClipBounds(visibleRect);
if (visibleRect==null) { // ???
visibleRect = getVisibleRect();
}
//System.out.println("FoldIndicator repainting: " + visibleRect);
if (visibleRect==null) {
return;
}
Color bg = getBackground();
if (getGutter()!=null) { // Should always be true
bg = getGutter().getBackground();
}
g.setColor(bg);
g.fillRect(0,visibleRect.y, getWidth(),visibleRect.height);
RSyntaxTextArea rsta = (RSyntaxTextArea)textArea;
if (!rsta.isCodeFoldingEnabled()) {
return; // We should be hidden in this case, but still...
}
if (textArea.getLineWrap()) {
paintComponentWrapped(g);
return;
}
// Get where to start painting (top of the row).
// We need to be "scrolled up" up just enough for the missing part of
// the first line.
textAreaInsets = textArea.getInsets(textAreaInsets);
if (visibleRect.y at least 1 physical line, so it may be that
// y<0. The computed y-value is the y-value of the top of the first
// (possibly) partially-visible view.
Rectangle visibleEditorRect = ui.getVisibleEditorRect();
Rectangle r = LineNumberList.getChildViewBounds(v, topLine,
visibleEditorRect);
int y = r.y;
y += (cellHeight-collapsedFoldIcon.getIconHeight())/2;
int visibleBottom = visibleRect.y + visibleRect.height;
int line = topLine;
boolean paintingOutlineLine = getShowArmedFoldRange() &&
foldWithOutlineShowing!=null &&
foldWithOutlineShowing.containsLine(line);
int lineCount = root.getElementCount();
while (y-1) {
line = textArea.getLineOfOffset(offs);
}
} catch (BadLocationException ble) {
ble.printStackTrace(); // Never happens
}
return line;
}
/**
* Adds to the amount of additional size to give the left margin of this
* component. This can be used to add blank space between this component
* and the line number indicator in the gutter.
*
* @param leftMargin The additional left margin. This should be
* {@code >= 0}.
* @see #getAdditionalLeftMargin()
*/
public void setAdditionalLeftMargin(int leftMargin) {
if (leftMargin < 0) {
throw new IllegalArgumentException("leftMargin must be >= 0");
}
this.additionalLeftMargin = leftMargin;
revalidate();
}
/**
* Sets the foreground color used for armed folds.
*
* @param fg The new armed fold foreground.
* @see #getArmedForeground()
*/
public void setArmedForeground(Color fg) {
if (fg==null) {
fg = FoldIndicator.DEFAULT_FOREGROUND;
}
armedForeground = fg;
}
private void setCollapsedFoldIconAlpha(float collapsedFoldIconAlpha) {
collapsedFoldIconAlpha = Math.max(0, Math.min(collapsedFoldIconAlpha, 1));
if (collapsedFoldIconAlpha != this.collapsedFoldIconAlpha) {
this.collapsedFoldIconAlpha = collapsedFoldIconAlpha;
repaint();
}
}
/**
* Sets the strategy to use for rendering expanded folds.
*
* @param strategy The strategy to use. This cannot be {@code null}.
* @see #getExpandedFoldRenderStrategy()
*/
public void setExpandedFoldRenderStrategy(ExpandedFoldRenderStrategy strategy) {
if (strategy == null) {
throw new NullPointerException("strategy cannot be null");
}
expandedFoldRenderStrategy = strategy;
collapsedFoldIconAlpha = strategy == ExpandedFoldRenderStrategy.ALWAYS ? 1 : 0;
}
/**
* Sets the color to use for the "background" of armed fold icons. This
* will be ignored if custom icons are used.
*
* @param bg The new background color. If {@code null} is passed in,
* there will be no special color for armed fold icons.
* @see #getFoldIconArmedBackground()
* @see #setFoldIconBackground(Color)
*/
public void setFoldIconArmedBackground(Color bg) {
foldIconArmedBackground = bg;
}
/**
* Sets the color to use for the "background" of fold icons. This will
* be ignored if custom icons are used.
*
* @param bg The new background color. This should not be {@code null}.
* @see #getFoldIconBackground()
* @see #setFoldIconArmedBackground(Color)
*/
public void setFoldIconBackground(Color bg) {
foldIconBackground = bg;
repaint();
}
/**
* Sets the icons to use to represent collapsed and expanded folds.
* This method can be used for further customization after setting this
* component's general appearance via {@link #setStyle(FoldIndicatorStyle)}.
*
* @param collapsedIcon The collapsed fold icon. This cannot be
* null.
* @param expandedIcon The expanded fold icon. This cannot be
* null.
* @see #setStyle(FoldIndicatorStyle)
*/
public void setFoldIcons(FoldIndicatorIcon collapsedIcon, FoldIndicatorIcon expandedIcon) {
this.collapsedFoldIcon = collapsedIcon;
this.expandedFoldIcon = expandedIcon;
revalidate(); // Icons may be different sizes.
repaint();
}
/**
* Toggles whether a line should be drawn to show the range of lines contained
* in an expanded fold when it is armed (hovered over).
*
* @param show Whether to show an armed fold's range.
* @see #getShowArmedFoldRange()
*/
public void setShowArmedFoldRange(boolean show) {
if (show != showArmedFoldRange) {
showArmedFoldRange = show;
repaint();
}
}
/**
* Toggles whether tool tips should be displayed showing the contents of
* collapsed fold regions when the mouse hovers over a +/- icon.
*
* @param show Whether to show these tool tips.
* @see #getShowCollapsedRegionToolTips()
*/
public void setShowCollapsedRegionToolTips(boolean show) {
if (show!=showFoldRegionTips) {
if (show) {
ToolTipManager.sharedInstance().registerComponent(this);
}
else {
ToolTipManager.sharedInstance().unregisterComponent(this);
}
showFoldRegionTips = show;
}
}
/**
* Toggles the presentation of this component. This method sets the icons used
* for fold regions to default values, amongst other configuration. To further
* customize these icons, see {@link #setFoldIcons(FoldIndicatorIcon, FoldIndicatorIcon)}.
*
* @param style The new presentation style.
* @see #setFoldIcons(FoldIndicatorIcon, FoldIndicatorIcon)
*/
void setStyle(FoldIndicatorStyle style) {
switch (style) {
case CLASSIC:
setFoldIcons(new PlusMinusFoldIcon(true), new PlusMinusFoldIcon(false));
setShowArmedFoldRange(true);
setExpandedFoldRenderStrategy(ExpandedFoldRenderStrategy.ALWAYS);
break;
case MODERN:
setFoldIcons(new ChevronFoldIcon(true), new ChevronFoldIcon(false));
setShowArmedFoldRange(false);
setExpandedFoldRenderStrategy(ExpandedFoldRenderStrategy.ON_HOVER);
break;
}
}
/**
* Overridden so we can track when code folding is enabled/disabled.
*/
@Override
public void setTextArea(RTextArea textArea) {
if (this.textArea!=null) {
this.textArea.removePropertyChangeListener(
RSyntaxTextArea.CODE_FOLDING_PROPERTY, listener);
}
super.setTextArea(textArea);
if (this.textArea!=null) {
this.textArea.addPropertyChangeListener(
RSyntaxTextArea.CODE_FOLDING_PROPERTY, listener);
}
}
/**
* Updates the alpha used for this component's "collapsed" fold icons, if
* necessary.
*/
private class AlphaRunnable implements ActionListener {
private float delta;
@Override
public void actionPerformed(ActionEvent e) {
setCollapsedFoldIconAlpha(collapsedFoldIconAlpha + delta);
if (collapsedFoldIconAlpha == 0 || collapsedFoldIconAlpha == 1) {
timer.stop();
}
}
}
/**
* Listens for events in this component.
*/
private class Listener extends MouseInputAdapter
implements PropertyChangeListener {
Listener(FoldIndicator fgc) {
fgc.addMouseListener(this);
fgc.addMouseMotionListener(this);
}
@Override
public void mouseClicked(MouseEvent e) {
Point p = e.getPoint();
int line = rowAtPoint(p);
RSyntaxTextArea rsta = (RSyntaxTextArea)textArea;
FoldManager fm = rsta.getFoldManager();
Fold fold = fm.getFoldForLine(line);
if (fold!=null) {
fold.toggleCollapsedState();
getGutter().repaint();
textArea.repaint();
}
}
@Override
public void mouseExited(MouseEvent e) {
if (foldWithOutlineShowing!=null) {
foldWithOutlineShowing = null;
mouseOverFoldIcon = false;
repaint();
}
}
@Override
public void mouseMoved(MouseEvent e) {
boolean oldMouseOverFoldIcon = mouseOverFoldIcon;
Fold newSelectedFold = findOpenFoldClosestTo(e.getPoint());
if (newSelectedFold!=foldWithOutlineShowing &&
newSelectedFold!=null && !newSelectedFold.isOnSingleLine()) {
foldWithOutlineShowing = newSelectedFold;
repaint();
}
else if (mouseOverFoldIcon != oldMouseOverFoldIcon) {
repaint();
}
}
@Override
public void propertyChange(PropertyChangeEvent e) {
// Whether folding is enabled in the editor has changed.
repaint();
}
}
}