public Shape modelToView(GlyphView v, int pos, Position.Bias bias, Shape a)
throws BadLocationException {
int offs = pos - v.getStartOffset();
Rectangle2D alloc = a.getBounds2D();
TextHitInfo hit =
(bias == Position.Bias.Forward)
? TextHitInfo.afterOffset(offs)
: TextHitInfo.beforeOffset(offs);
float[] locs = layout.getCaretInfo(hit);
// vertical at the baseline, should use slope and check if glyphs
// are being rendered vertically.
alloc.setRect(alloc.getX() + locs[0], alloc.getY(), 1, alloc.getHeight());
return alloc;
}
/**
* 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 either <code>Position.Bias.Forward</code> or <code>Position.Bias.Backward
* </code> is returned as the zero-th element of this array
* @return the location within the model that best represents the given point of view
* @see View#viewToModel
*/
public int viewToModel(GlyphView v, float x, float y, Shape a, Position.Bias[] biasReturn) {
Rectangle2D alloc = (a instanceof Rectangle2D) ? (Rectangle2D) a : a.getBounds2D();
// Move the y co-ord of the hit onto the baseline. This is because TextLayout supports
// italic carets and we do not.
TextHitInfo hit = layout.hitTestChar(x - (float) alloc.getX(), 0);
int pos = hit.getInsertionIndex();
if (pos == v.getEndOffset()) {
pos--;
}
biasReturn[0] = hit.isLeadingEdge() ? Position.Bias.Forward : Position.Bias.Backward;
return pos + v.getStartOffset();
}
/**
* Paint the glyphs for the given view. This is implemented to only render if the Graphics is of
* type Graphics2D which is required by TextLayout (and this should be the case if running on the
* JDK).
*/
public void paint(GlyphView v, Graphics g, Shape a, int p0, int p1) {
if (g instanceof Graphics2D) {
Rectangle2D alloc = a.getBounds2D();
Graphics2D g2d = (Graphics2D) g;
float y = (float) alloc.getY() + layout.getAscent() + layout.getLeading();
float x = (float) alloc.getX();
if (p0 > v.getStartOffset() || p1 < v.getEndOffset()) {
try {
// TextLayout can't render only part of it's range, so if a
// partial range is required, add a clip region.
Shape s = v.modelToView(p0, Position.Bias.Forward, p1, Position.Bias.Backward, a);
Shape savedClip = g.getClip();
g2d.clip(s);
layout.draw(g2d, x, y);
g.setClip(savedClip);
} catch (BadLocationException e) {
}
} else {
layout.draw(g2d, x, y);
}
}
}