Java example source code file (WrappedPlainView.java)
The WrappedPlainView.java Java example source code
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*
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* 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
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package javax.swing.text;
import java.awt.*;
import java.lang.ref.SoftReference;
import javax.swing.event.*;
/**
* View of plain text (text with only one font and color)
* that does line-wrapping. This view expects that its
* associated element has child elements that represent
* the lines it should be wrapping. It is implemented
* as a vertical box that contains logical line views.
* The logical line views are nested classes that render
* the logical line as multiple physical line if the logical
* line is too wide to fit within the allocation. The
* line views draw upon the outer class for its state
* to reduce their memory requirements.
* <p>
* The line views do all of their rendering through the
* <code>drawLine method which in turn does all of
* its rendering through the <code>drawSelectedText
* and <code>drawUnselectedText methods. This
* enables subclasses to easily specialize the rendering
* without concern for the layout aspects.
*
* @author Timothy Prinzing
* @see View
*/
public class WrappedPlainView extends BoxView implements TabExpander {
/**
* Creates a new WrappedPlainView. Lines will be wrapped
* on character boundaries.
*
* @param elem the element underlying the view
*/
public WrappedPlainView(Element elem) {
this(elem, false);
}
/**
* Creates a new WrappedPlainView. Lines can be wrapped on
* either character or word boundaries depending upon the
* setting of the wordWrap parameter.
*
* @param elem the element underlying the view
* @param wordWrap should lines be wrapped on word boundaries?
*/
public WrappedPlainView(Element elem, boolean wordWrap) {
super(elem, Y_AXIS);
this.wordWrap = wordWrap;
}
/**
* Returns the tab size set for the document, defaulting to 8.
*
* @return the tab size
*/
protected int getTabSize() {
Integer i = (Integer) getDocument().getProperty(PlainDocument.tabSizeAttribute);
int size = (i != null) ? i.intValue() : 8;
return size;
}
/**
* Renders a line of text, suppressing whitespace at the end
* and expanding any tabs. This is implemented to make calls
* to the methods <code>drawUnselectedText and
* <code>drawSelectedText so that the way selected and
* unselected text are rendered can be customized.
*
* @param p0 the starting document location to use >= 0
* @param p1 the ending document location to use >= p1
* @param g the graphics context
* @param x the starting X position >= 0
* @param y the starting Y position >= 0
* @see #drawUnselectedText
* @see #drawSelectedText
*/
protected void drawLine(int p0, int p1, Graphics g, int x, int y) {
Element lineMap = getElement();
Element line = lineMap.getElement(lineMap.getElementIndex(p0));
Element elem;
try {
if (line.isLeaf()) {
drawText(line, p0, p1, g, x, y);
} else {
// this line contains the composed text.
int idx = line.getElementIndex(p0);
int lastIdx = line.getElementIndex(p1);
for(; idx <= lastIdx; idx++) {
elem = line.getElement(idx);
int start = Math.max(elem.getStartOffset(), p0);
int end = Math.min(elem.getEndOffset(), p1);
x = drawText(elem, start, end, g, x, y);
}
}
} catch (BadLocationException e) {
throw new StateInvariantError("Can't render: " + p0 + "," + p1);
}
}
private int drawText(Element elem, int p0, int p1, Graphics g, int x, int y) throws BadLocationException {
p1 = Math.min(getDocument().getLength(), p1);
AttributeSet attr = elem.getAttributes();
if (Utilities.isComposedTextAttributeDefined(attr)) {
g.setColor(unselected);
x = Utilities.drawComposedText(this, attr, g, x, y,
p0-elem.getStartOffset(),
p1-elem.getStartOffset());
} else {
if (sel0 == sel1 || selected == unselected) {
// no selection, or it is invisible
x = drawUnselectedText(g, x, y, p0, p1);
} else if ((p0 >= sel0 && p0 <= sel1) && (p1 >= sel0 && p1 <= sel1)) {
x = drawSelectedText(g, x, y, p0, p1);
} else if (sel0 >= p0 && sel0 <= p1) {
if (sel1 >= p0 && sel1 <= p1) {
x = drawUnselectedText(g, x, y, p0, sel0);
x = drawSelectedText(g, x, y, sel0, sel1);
x = drawUnselectedText(g, x, y, sel1, p1);
} else {
x = drawUnselectedText(g, x, y, p0, sel0);
x = drawSelectedText(g, x, y, sel0, p1);
}
} else if (sel1 >= p0 && sel1 <= p1) {
x = drawSelectedText(g, x, y, p0, sel1);
x = drawUnselectedText(g, x, y, sel1, p1);
} else {
x = drawUnselectedText(g, x, y, p0, p1);
}
}
return x;
}
/**
* Renders the given range in the model as normal unselected
* text.
*
* @param g the graphics context
* @param x the starting X coordinate >= 0
* @param y the starting Y coordinate >= 0
* @param p0 the beginning position in the model >= 0
* @param p1 the ending position in the model >= p0
* @return the X location of the end of the range >= 0
* @exception BadLocationException if the range is invalid
*/
protected int drawUnselectedText(Graphics g, int x, int y,
int p0, int p1) throws BadLocationException {
g.setColor(unselected);
Document doc = getDocument();
Segment segment = SegmentCache.getSharedSegment();
doc.getText(p0, p1 - p0, segment);
int ret = Utilities.drawTabbedText(this, segment, x, y, g, this, p0);
SegmentCache.releaseSharedSegment(segment);
return ret;
}
/**
* Renders the given range in the model as selected text. This
* is implemented to render the text in the color specified in
* the hosting component. It assumes the highlighter will render
* the selected background.
*
* @param g the graphics context
* @param x the starting X coordinate >= 0
* @param y the starting Y coordinate >= 0
* @param p0 the beginning position in the model >= 0
* @param p1 the ending position in the model >= p0
* @return the location of the end of the range.
* @exception BadLocationException if the range is invalid
*/
protected int drawSelectedText(Graphics g, int x,
int y, int p0, int p1) throws BadLocationException {
g.setColor(selected);
Document doc = getDocument();
Segment segment = SegmentCache.getSharedSegment();
doc.getText(p0, p1 - p0, segment);
int ret = Utilities.drawTabbedText(this, segment, x, y, g, this, p0);
SegmentCache.releaseSharedSegment(segment);
return ret;
}
/**
* Gives access to a buffer that can be used to fetch
* text from the associated document.
*
* @return the buffer
*/
protected final Segment getLineBuffer() {
if (lineBuffer == null) {
lineBuffer = new Segment();
}
return lineBuffer;
}
/**
* This is called by the nested wrapped line
* views to determine the break location. This can
* be reimplemented to alter the breaking behavior.
* It will either break at word or character boundaries
* depending upon the break argument given at
* construction.
*/
protected int calculateBreakPosition(int p0, int p1) {
int p;
Segment segment = SegmentCache.getSharedSegment();
loadText(segment, p0, p1);
int currentWidth = getWidth();
if (wordWrap) {
p = p0 + Utilities.getBreakLocation(segment, metrics,
tabBase, tabBase + currentWidth,
this, p0);
} else {
p = p0 + Utilities.getTabbedTextOffset(segment, metrics,
tabBase, tabBase + currentWidth,
this, p0, false);
}
SegmentCache.releaseSharedSegment(segment);
return p;
}
/**
* Loads all of the children to initialize the view.
* This is called by the <code>setParent method.
* Subclasses can reimplement this to initialize their
* child views in a different manner. The default
* implementation creates a child view for each
* child element.
*
* @param f the view factory
*/
protected void loadChildren(ViewFactory f) {
Element e = getElement();
int n = e.getElementCount();
if (n > 0) {
View[] added = new View[n];
for (int i = 0; i < n; i++) {
added[i] = new WrappedLine(e.getElement(i));
}
replace(0, 0, added);
}
}
/**
* Update the child views in response to a
* document event.
*/
void updateChildren(DocumentEvent e, Shape a) {
Element elem = getElement();
DocumentEvent.ElementChange ec = e.getChange(elem);
if (ec != null) {
// the structure of this element changed.
Element[] removedElems = ec.getChildrenRemoved();
Element[] addedElems = ec.getChildrenAdded();
View[] added = new View[addedElems.length];
for (int i = 0; i < addedElems.length; i++) {
added[i] = new WrappedLine(addedElems[i]);
}
replace(ec.getIndex(), removedElems.length, added);
// should damge a little more intelligently.
if (a != null) {
preferenceChanged(null, true, true);
getContainer().repaint();
}
}
// update font metrics which may be used by the child views
updateMetrics();
}
/**
* Load the text buffer with the given range
* of text. This is used by the fragments
* broken off of this view as well as this
* view itself.
*/
final void loadText(Segment segment, int p0, int p1) {
try {
Document doc = getDocument();
doc.getText(p0, p1 - p0, segment);
} catch (BadLocationException bl) {
throw new StateInvariantError("Can't get line text");
}
}
final void updateMetrics() {
Component host = getContainer();
Font f = host.getFont();
metrics = host.getFontMetrics(f);
tabSize = getTabSize() * metrics.charWidth('m');
}
// --- TabExpander methods ------------------------------------------
/**
* Returns the next tab stop position after a given reference position.
* This implementation does not support things like centering so it
* ignores the tabOffset argument.
*
* @param x the current position >= 0
* @param tabOffset the position within the text stream
* that the tab occurred at >= 0.
* @return the tab stop, measured in points >= 0
*/
public float nextTabStop(float x, int tabOffset) {
if (tabSize == 0)
return x;
int ntabs = ((int) x - tabBase) / tabSize;
return tabBase + ((ntabs + 1) * tabSize);
}
// --- View methods -------------------------------------
/**
* Renders using the given rendering surface and area
* on that surface. This is implemented to stash the
* selection positions, selection colors, and font
* metrics for the nested lines to use.
*
* @param g the rendering surface to use
* @param a the allocated region to render into
*
* @see View#paint
*/
public void paint(Graphics g, Shape a) {
Rectangle alloc = (Rectangle) a;
tabBase = alloc.x;
JTextComponent host = (JTextComponent) getContainer();
sel0 = host.getSelectionStart();
sel1 = host.getSelectionEnd();
unselected = (host.isEnabled()) ?
host.getForeground() : host.getDisabledTextColor();
Caret c = host.getCaret();
selected = c.isSelectionVisible() && host.getHighlighter() != null ?
host.getSelectedTextColor() : unselected;
g.setFont(host.getFont());
// superclass paints the children
super.paint(g, a);
}
/**
* Sets the size of the view. This should cause
* layout of the view along the given axis, if it
* has any layout duties.
*
* @param width the width >= 0
* @param height the height >= 0
*/
public void setSize(float width, float height) {
updateMetrics();
if ((int) width != getWidth()) {
// invalidate the view itself since the desired widths
// of the children will be based upon this views width.
preferenceChanged(null, true, true);
widthChanging = true;
}
super.setSize(width, height);
widthChanging = false;
}
/**
* Determines the preferred span for this view along an
* axis. This is implemented to provide the superclass
* behavior after first making sure that the current font
* metrics are cached (for the nested lines which use
* the metrics to determine the height of the potentially
* wrapped lines).
*
* @param axis may be either View.X_AXIS or View.Y_AXIS
* @return the span the view would like to be rendered into.
* Typically the view is told to render into the span
* that is returned, although there is no guarantee.
* The parent may choose to resize or break the view.
* @see View#getPreferredSpan
*/
public float getPreferredSpan(int axis) {
updateMetrics();
return super.getPreferredSpan(axis);
}
/**
* Determines the minimum span for this view along an
* axis. This is implemented to provide the superclass
* behavior after first making sure that the current font
* metrics are cached (for the nested lines which use
* the metrics to determine the height of the potentially
* wrapped lines).
*
* @param axis may be either View.X_AXIS or View.Y_AXIS
* @return the span the view would like to be rendered into.
* Typically the view is told to render into the span
* that is returned, although there is no guarantee.
* The parent may choose to resize or break the view.
* @see View#getMinimumSpan
*/
public float getMinimumSpan(int axis) {
updateMetrics();
return super.getMinimumSpan(axis);
}
/**
* Determines the maximum span for this view along an
* axis. This is implemented to provide the superclass
* behavior after first making sure that the current font
* metrics are cached (for the nested lines which use
* the metrics to determine the height of the potentially
* wrapped lines).
*
* @param axis may be either View.X_AXIS or View.Y_AXIS
* @return the span the view would like to be rendered into.
* Typically the view is told to render into the span
* that is returned, although there is no guarantee.
* The parent may choose to resize or break the view.
* @see View#getMaximumSpan
*/
public float getMaximumSpan(int axis) {
updateMetrics();
return super.getMaximumSpan(axis);
}
/**
* Gives notification that something was inserted into the
* document in a location that this view is responsible for.
* This is implemented to simply update the children.
*
* @param e the change information from the associated document
* @param a the current allocation of the view
* @param f the factory to use to rebuild if the view has children
* @see View#insertUpdate
*/
public void insertUpdate(DocumentEvent e, Shape a, ViewFactory f) {
updateChildren(e, a);
Rectangle alloc = ((a != null) && isAllocationValid()) ?
getInsideAllocation(a) : null;
int pos = e.getOffset();
View v = getViewAtPosition(pos, alloc);
if (v != null) {
v.insertUpdate(e, alloc, f);
}
}
/**
* Gives notification that something was removed from the
* document in a location that this view is responsible for.
* This is implemented to simply update the children.
*
* @param e the change information from the associated document
* @param a the current allocation of the view
* @param f the factory to use to rebuild if the view has children
* @see View#removeUpdate
*/
public void removeUpdate(DocumentEvent e, Shape a, ViewFactory f) {
updateChildren(e, a);
Rectangle alloc = ((a != null) && isAllocationValid()) ?
getInsideAllocation(a) : null;
int pos = e.getOffset();
View v = getViewAtPosition(pos, alloc);
if (v != null) {
v.removeUpdate(e, alloc, f);
}
}
/**
* Gives notification from the document that attributes were changed
* in a location that this view is responsible for.
*
* @param e the change information from the associated document
* @param a the current allocation of the view
* @param f the factory to use to rebuild if the view has children
* @see View#changedUpdate
*/
public void changedUpdate(DocumentEvent e, Shape a, ViewFactory f) {
updateChildren(e, a);
}
// --- variables -------------------------------------------
FontMetrics metrics;
Segment lineBuffer;
boolean widthChanging;
int tabBase;
int tabSize;
boolean wordWrap;
int sel0;
int sel1;
Color unselected;
Color selected;
/**
* Simple view of a line that wraps if it doesn't
* fit withing the horizontal space allocated.
* This class tries to be lightweight by carrying little
* state of it's own and sharing the state of the outer class
* with it's sibblings.
*/
class WrappedLine extends View {
WrappedLine(Element elem) {
super(elem);
lineCount = -1;
}
/**
* Determines the preferred span for this view along an
* axis.
*
* @param axis may be either X_AXIS or Y_AXIS
* @return the span the view would like to be rendered into.
* Typically the view is told to render into the span
* that is returned, although there is no guarantee.
* The parent may choose to resize or break the view.
* @see View#getPreferredSpan
*/
public float getPreferredSpan(int axis) {
switch (axis) {
case View.X_AXIS:
float width = getWidth();
if (width == Integer.MAX_VALUE) {
// We have been initially set to MAX_VALUE, but we don't
// want this as our preferred.
return 100f;
}
return width;
case View.Y_AXIS:
if (lineCount < 0 || widthChanging) {
breakLines(getStartOffset());
}
return lineCount * metrics.getHeight();
default:
throw new IllegalArgumentException("Invalid axis: " + axis);
}
}
/**
* Renders using the given rendering surface and area on that
* surface. The view may need to do layout and create child
* views to enable itself to render into the given allocation.
*
* @param g the rendering surface to use
* @param a the allocated region to render into
* @see View#paint
*/
public void paint(Graphics g, Shape a) {
Rectangle alloc = (Rectangle) a;
int y = alloc.y + metrics.getAscent();
int x = alloc.x;
JTextComponent host = (JTextComponent)getContainer();
Highlighter h = host.getHighlighter();
LayeredHighlighter dh = (h instanceof LayeredHighlighter) ?
(LayeredHighlighter)h : null;
int start = getStartOffset();
int end = getEndOffset();
int p0 = start;
int[] lineEnds = getLineEnds();
for (int i = 0; i < lineCount; i++) {
int p1 = (lineEnds == null) ? end :
start + lineEnds[i];
if (dh != null) {
int hOffset = (p1 == end)
? (p1 - 1)
: p1;
dh.paintLayeredHighlights(g, p0, hOffset, a, host, this);
}
drawLine(p0, p1, g, x, y);
p0 = p1;
y += metrics.getHeight();
}
}
/**
* Provides a mapping from the document model coordinate space
* to the coordinate space of the view mapped to it.
*
* @param pos the position to convert
* @param a the allocated region to render into
* @return the bounding box of the given position is returned
* @exception BadLocationException if the given position does not represent a
* valid location in the associated document
* @see View#modelToView
*/
public Shape modelToView(int pos, Shape a, Position.Bias b)
throws BadLocationException {
Rectangle alloc = a.getBounds();
alloc.height = metrics.getHeight();
alloc.width = 1;
int p0 = getStartOffset();
if (pos < p0 || pos > getEndOffset()) {
throw new BadLocationException("Position out of range", pos);
}
int testP = (b == Position.Bias.Forward) ? pos :
Math.max(p0, pos - 1);
int line = 0;
int[] lineEnds = getLineEnds();
if (lineEnds != null) {
line = findLine(testP - p0);
if (line > 0) {
p0 += lineEnds[line - 1];
}
alloc.y += alloc.height * line;
}
if (pos > p0) {
Segment segment = SegmentCache.getSharedSegment();
loadText(segment, p0, pos);
alloc.x += Utilities.getTabbedTextWidth(segment, metrics,
alloc.x, WrappedPlainView.this, p0);
SegmentCache.releaseSharedSegment(segment);
}
return alloc;
}
/**
* Provides a mapping from the view coordinate space to the logical
* coordinate space of the model.
*
* @param fx the X coordinate
* @param fy the Y coordinate
* @param a the allocated region to render into
* @return the location within the model that best represents the
* given point in the view
* @see View#viewToModel
*/
public int viewToModel(float fx, float fy, Shape a, Position.Bias[] bias) {
// PENDING(prinz) implement bias properly
bias[0] = Position.Bias.Forward;
Rectangle alloc = (Rectangle) a;
int x = (int) fx;
int y = (int) fy;
if (y < alloc.y) {
// above the area covered by this icon, so the the position
// is assumed to be the start of the coverage for this view.
return getStartOffset();
} else if (y > alloc.y + alloc.height) {
// below the area covered by this icon, so the the position
// is assumed to be the end of the coverage for this view.
return getEndOffset() - 1;
} else {
// positioned within the coverage of this view vertically,
// so we figure out which line the point corresponds to.
// if the line is greater than the number of lines contained, then
// simply use the last line as it represents the last possible place
// we can position to.
alloc.height = metrics.getHeight();
int line = (alloc.height > 0 ?
(y - alloc.y) / alloc.height : lineCount - 1);
if (line >= lineCount) {
return getEndOffset() - 1;
} else {
int p0 = getStartOffset();
int p1;
if (lineCount == 1) {
p1 = getEndOffset();
} else {
int[] lineEnds = getLineEnds();
p1 = p0 + lineEnds[line];
if (line > 0) {
p0 += lineEnds[line - 1];
}
}
if (x < alloc.x) {
// point is to the left of the line
return p0;
} else if (x > alloc.x + alloc.width) {
// point is to the right of the line
return p1 - 1;
} else {
// Determine the offset into the text
Segment segment = SegmentCache.getSharedSegment();
loadText(segment, p0, p1);
int n = Utilities.getTabbedTextOffset(segment, metrics,
alloc.x, x,
WrappedPlainView.this, p0);
SegmentCache.releaseSharedSegment(segment);
return Math.min(p0 + n, p1 - 1);
}
}
}
}
public void insertUpdate(DocumentEvent e, Shape a, ViewFactory f) {
update(e, a);
}
public void removeUpdate(DocumentEvent e, Shape a, ViewFactory f) {
update(e, a);
}
private void update(DocumentEvent ev, Shape a) {
int oldCount = lineCount;
breakLines(ev.getOffset());
if (oldCount != lineCount) {
WrappedPlainView.this.preferenceChanged(this, false, true);
// have to repaint any views after the receiver.
getContainer().repaint();
} else if (a != null) {
Component c = getContainer();
Rectangle alloc = (Rectangle) a;
c.repaint(alloc.x, alloc.y, alloc.width, alloc.height);
}
}
/**
* Returns line cache. If the cache was GC'ed, recreates it.
* If there's no cache, returns null
*/
final int[] getLineEnds() {
if (lineCache == null) {
return null;
} else {
int[] lineEnds = lineCache.get();
if (lineEnds == null) {
// Cache was GC'ed, so rebuild it
return breakLines(getStartOffset());
} else {
return lineEnds;
}
}
}
/**
* Creates line cache if text breaks into more than one physical line.
* @param startPos position to start breaking from
* @return the cache created, ot null if text breaks into one line
*/
final int[] breakLines(int startPos) {
int[] lineEnds = (lineCache == null) ? null : lineCache.get();
int[] oldLineEnds = lineEnds;
int start = getStartOffset();
int lineIndex = 0;
if (lineEnds != null) {
lineIndex = findLine(startPos - start);
if (lineIndex > 0) {
lineIndex--;
}
}
int p0 = (lineIndex == 0) ? start : start + lineEnds[lineIndex - 1];
int p1 = getEndOffset();
while (p0 < p1) {
int p = calculateBreakPosition(p0, p1);
p0 = (p == p0) ? ++p : p; // 4410243
if (lineIndex == 0 && p0 >= p1) {
// do not use cache if there's only one line
lineCache = null;
lineEnds = null;
lineIndex = 1;
break;
} else if (lineEnds == null || lineIndex >= lineEnds.length) {
// we have 2+ lines, and the cache is not big enough
// we try to estimate total number of lines
double growFactor = ((double)(p1 - start) / (p0 - start));
int newSize = (int)Math.ceil((lineIndex + 1) * growFactor);
newSize = Math.max(newSize, lineIndex + 2);
int[] tmp = new int[newSize];
if (lineEnds != null) {
System.arraycopy(lineEnds, 0, tmp, 0, lineIndex);
}
lineEnds = tmp;
}
lineEnds[lineIndex++] = p0 - start;
}
lineCount = lineIndex;
if (lineCount > 1) {
// check if the cache is too big
int maxCapacity = lineCount + lineCount / 3;
if (lineEnds.length > maxCapacity) {
int[] tmp = new int[maxCapacity];
System.arraycopy(lineEnds, 0, tmp, 0, lineCount);
lineEnds = tmp;
}
}
if (lineEnds != null && lineEnds != oldLineEnds) {
lineCache = new SoftReference<int[]>(lineEnds);
}
return lineEnds;
}
/**
* Binary search in the cache for line containing specified offset
* (which is relative to the beginning of the view). This method
* assumes that cache exists.
*/
private int findLine(int offset) {
int[] lineEnds = lineCache.get();
if (offset < lineEnds[0]) {
return 0;
} else if (offset > lineEnds[lineCount - 1]) {
return lineCount;
} else {
return findLine(lineEnds, offset, 0, lineCount - 1);
}
}
private int findLine(int[] array, int offset, int min, int max) {
if (max - min <= 1) {
return max;
} else {
int mid = (max + min) / 2;
return (offset < array[mid]) ?
findLine(array, offset, min, mid) :
findLine(array, offset, mid, max);
}
}
int lineCount;
SoftReference<int[]> lineCache = null;
}
}
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