/**
* Determines the preferred span for this view along an axis.
*
* @param axis may be either View.X_AXIS or View.Y_AXIS
* @return the span the view would like to be rendered into >= 0. 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.
*/
public float getPreferredSpan(int axis) {
switch (axis) {
case View.X_AXIS:
Segment buff = SegmentCache.getSharedSegment();
Document doc = getDocument();
int width;
try {
FontMetrics fm = getFontMetrics();
doc.getText(0, doc.getLength(), buff);
width = Utilities.getTabbedTextWidth(buff, fm, 0, this, 0);
if (buff.count > 0) {
Component c = getContainer();
firstLineOffset =
sun.swing.SwingUtilities2.getLeftSideBearing(
(c instanceof JComponent) ? (JComponent) c : null, fm, buff.array[buff.offset]);
firstLineOffset = Math.max(0, -firstLineOffset);
} else {
firstLineOffset = 0;
}
} catch (BadLocationException bl) {
width = 0;
}
SegmentCache.releaseSharedSegment(buff);
return width + firstLineOffset;
default:
return super.getPreferredSpan(axis);
}
}
/** Paints the glyphs representing the given range. */
public void paint(GlyphView v, Graphics g, Shape a, int p0, int p1) {
sync(v);
Segment text;
TabExpander expander = v.getTabExpander();
Rectangle alloc = (a instanceof Rectangle) ? (Rectangle) a : a.getBounds();
// determine the x coordinate to render the glyphs
int x = alloc.x;
int p = v.getStartOffset();
int[] justificationData = getJustificationData(v);
if (p != p0) {
text = v.getText(p, p0);
int width = Utilities.getTabbedTextWidth(v, text, metrics, x, expander, p, justificationData);
x += width;
SegmentCache.releaseSharedSegment(text);
}
// determine the y coordinate to render the glyphs
int y = alloc.y + metrics.getHeight() - metrics.getDescent();
// render the glyphs
text = v.getText(p0, p1);
g.setFont(metrics.getFont());
Utilities.drawTabbedText(v, text, x, y, g, expander, p0, justificationData);
SegmentCache.releaseSharedSegment(text);
}
public Shape modelToView(GlyphView v, int pos, Position.Bias bias, Shape a)
throws BadLocationException {
sync(v);
Rectangle alloc = (a instanceof Rectangle) ? (Rectangle) a : a.getBounds();
int p0 = v.getStartOffset();
int p1 = v.getEndOffset();
TabExpander expander = v.getTabExpander();
Segment text;
if (pos == p1) {
// The caller of this is left to right and borders a right to
// left view, return our end location.
return new Rectangle(alloc.x + alloc.width, alloc.y, 0, metrics.getHeight());
}
if ((pos >= p0) && (pos <= p1)) {
// determine range to the left of the position
text = v.getText(p0, pos);
int[] justificationData = getJustificationData(v);
int width =
Utilities.getTabbedTextWidth(v, text, metrics, alloc.x, expander, p0, justificationData);
SegmentCache.releaseSharedSegment(text);
return new Rectangle(alloc.x + width, alloc.y, 0, metrics.getHeight());
}
throw new BadLocationException("modelToView - can't convert", p1);
}
/** Determine the span the glyphs given a start location (for tab expansion). */
public float getSpan(GlyphView v, int p0, int p1, TabExpander e, float x) {
sync(v);
Segment text = v.getText(p0, p1);
int[] justificationData = getJustificationData(v);
int width = Utilities.getTabbedTextWidth(v, text, metrics, (int) x, e, p0, justificationData);
SegmentCache.releaseSharedSegment(text);
return width;
}
/**
* Determines the best location (in the model) to break the given view. This method attempts to
* break on a whitespace location. If a whitespace location can't be found, the nearest character
* location is returned.
*
* @param v the view
* @param p0 the location in the model where the fragment should start its representation >= 0
* @param pos the graphic location along the axis that the broken view would occupy >= 0; this may
* be useful for things like tab calculations
* @param len specifies the distance into the view where a potential break is desired >= 0
* @return the model location desired for a break
* @see View#breakView
*/
public int getBoundedPosition(GlyphView v, int p0, float x, float len) {
sync(v);
TabExpander expander = v.getTabExpander();
Segment s = v.getText(p0, v.getEndOffset());
int[] justificationData = getJustificationData(v);
int index =
Utilities.getTabbedTextOffset(
v, s, metrics, (int) x, (int) (x + len), expander, p0, false, justificationData);
SegmentCache.releaseSharedSegment(s);
int p1 = p0 + index;
return p1;
}
/**
* Provides a mapping from the view coordinate space to the logical coordinate space of the model.
*
* @param v the view containing the view coordinates
* @param x the X coordinate
* @param y the Y coordinate
* @param a the allocated region to render into
* @param biasReturn always returns <code>Position.Bias.Forward</code> as the zero-th element of
* this array
* @return the location within the model that best represents the given point in the view
* @see View#viewToModel
*/
public int viewToModel(GlyphView v, float x, float y, Shape a, Position.Bias[] biasReturn) {
sync(v);
Rectangle alloc = (a instanceof Rectangle) ? (Rectangle) a : a.getBounds();
int p0 = v.getStartOffset();
int p1 = v.getEndOffset();
TabExpander expander = v.getTabExpander();
Segment text = v.getText(p0, p1);
int[] justificationData = getJustificationData(v);
int offs =
Utilities.getTabbedTextOffset(
v, text, metrics, alloc.x, (int) x, expander, p0, justificationData);
SegmentCache.releaseSharedSegment(text);
int retValue = p0 + offs;
if (retValue == p1) {
// No need to return backward bias as GlyphPainter1 is used for
// ltr text only.
retValue--;
}
biasReturn[0] = Position.Bias.Forward;
return retValue;
}
/**
* Provides a way to determine the next visually represented model location that one might place a
* caret. Some views may not be visible, they might not be in the same order found in the model,
* or they just might not allow access to some of the locations in the model.
*
* @param v the view to use
* @param pos the position to convert >= 0
* @param a the allocated region to render into
* @param direction the direction from the current position that can be thought of as the arrow
* keys typically found on a keyboard. This may be SwingConstants.WEST, SwingConstants.EAST,
* SwingConstants.NORTH, or SwingConstants.SOUTH.
* @return the location within the model that best represents the next location visual position.
* @exception BadLocationException
* @exception IllegalArgumentException for an invalid direction
*/
public int getNextVisualPositionFrom(
GlyphView v, int pos, Position.Bias b, Shape a, int direction, Position.Bias[] biasRet)
throws BadLocationException {
int startOffset = v.getStartOffset();
int endOffset = v.getEndOffset();
Segment text;
AbstractDocument doc;
boolean viewIsLeftToRight;
TextHitInfo currentHit, nextHit;
switch (direction) {
case View.NORTH:
break;
case View.SOUTH:
break;
case View.EAST:
doc = (AbstractDocument) v.getDocument();
viewIsLeftToRight = doc.isLeftToRight(startOffset, endOffset);
if (startOffset == doc.getLength()) {
if (pos == -1) {
biasRet[0] = Position.Bias.Forward;
return startOffset;
}
// End case for bidi text where newline is at beginning
// of line.
return -1;
}
if (pos == -1) {
// Entering view from the left.
if (viewIsLeftToRight) {
biasRet[0] = Position.Bias.Forward;
return startOffset;
} else {
text = v.getText(endOffset - 1, endOffset);
char c = text.array[text.offset];
SegmentCache.releaseSharedSegment(text);
if (c == '\n') {
biasRet[0] = Position.Bias.Forward;
return endOffset - 1;
}
biasRet[0] = Position.Bias.Backward;
return endOffset;
}
}
if (b == Position.Bias.Forward) currentHit = TextHitInfo.afterOffset(pos - startOffset);
else currentHit = TextHitInfo.beforeOffset(pos - startOffset);
nextHit = layout.getNextRightHit(currentHit);
if (nextHit == null) {
return -1;
}
if (viewIsLeftToRight != layout.isLeftToRight()) {
// If the layout's base direction is different from
// this view's run direction, we need to use the weak
// carrat.
nextHit = layout.getVisualOtherHit(nextHit);
}
pos = nextHit.getInsertionIndex() + startOffset;
if (pos == endOffset) {
// A move to the right from an internal position will
// only take us to the endOffset in a left to right run.
text = v.getText(endOffset - 1, endOffset);
char c = text.array[text.offset];
SegmentCache.releaseSharedSegment(text);
if (c == '\n') {
return -1;
}
biasRet[0] = Position.Bias.Backward;
} else {
biasRet[0] = Position.Bias.Forward;
}
return pos;
case View.WEST:
doc = (AbstractDocument) v.getDocument();
viewIsLeftToRight = doc.isLeftToRight(startOffset, endOffset);
if (startOffset == doc.getLength()) {
if (pos == -1) {
biasRet[0] = Position.Bias.Forward;
return startOffset;
}
// End case for bidi text where newline is at beginning
// of line.
return -1;
}
if (pos == -1) {
// Entering view from the right
if (viewIsLeftToRight) {
text = v.getText(endOffset - 1, endOffset);
char c = text.array[text.offset];
SegmentCache.releaseSharedSegment(text);
if ((c == '\n') || Character.isSpaceChar(c)) {
biasRet[0] = Position.Bias.Forward;
return endOffset - 1;
}
biasRet[0] = Position.Bias.Backward;
return endOffset;
} else {
biasRet[0] = Position.Bias.Forward;
return startOffset;
}
}
if (b == Position.Bias.Forward) currentHit = TextHitInfo.afterOffset(pos - startOffset);
else currentHit = TextHitInfo.beforeOffset(pos - startOffset);
nextHit = layout.getNextLeftHit(currentHit);
if (nextHit == null) {
return -1;
}
if (viewIsLeftToRight != layout.isLeftToRight()) {
// If the layout's base direction is different from
// this view's run direction, we need to use the weak
// carrat.
nextHit = layout.getVisualOtherHit(nextHit);
}
pos = nextHit.getInsertionIndex() + startOffset;
if (pos == endOffset) {
// A move to the left from an internal position will
// only take us to the endOffset in a right to left run.
text = v.getText(endOffset - 1, endOffset);
char c = text.array[text.offset];
SegmentCache.releaseSharedSegment(text);
if (c == '\n') {
return -1;
}
biasRet[0] = Position.Bias.Backward;
} else {
biasRet[0] = Position.Bias.Forward;
}
return pos;
default:
throw new IllegalArgumentException("Bad direction: " + direction);
}
return pos;
}