/**
* Provides a mapping, for a given region, from the document model coordinate space to the view
* coordinate space. The specified region is created as a union of the first and last character
* positions.
*
* <p>This is implemented to subtract the width of the second character, as this view's <code>
* modelToView</code> actually returns the width of the character instead of "1" or "0" like the
* View implementations in <code>javax.swing.text</code>. Thus, if we don't override this method,
* the <code>View</code> implementation will return one character's width too much for its
* consumers (implementations of <code>javax.swing.text.Highlighter</code>).
*
* @param p0 the position of the first character (>=0)
* @param b0 The bias of the first character position, toward the previous character or the next
* character represented by the offset, in case the position is a boundary of two views;
* <code>b0</code> will have one of these values:
* <ul>
* <li><code>Position.Bias.Forward</code>
* <li><code>Position.Bias.Backward</code>
* </ul>
*
* @param p1 the position of the last character (>=0)
* @param b1 the bias for the second character position, defined one of the legal values shown
* above
* @param a the area of the view, which encompasses the requested region
* @return the bounding box which is a union of the region specified by the first and last
* character positions
* @exception BadLocationException if the given position does not represent a valid location in
* the associated document
* @exception IllegalArgumentException if <code>b0</code> or <code>b1</code> are not one of the
* legal <code>Position.Bias</code> values listed above
* @see View#viewToModel
*/
@Override
public Shape modelToView(int p0, Position.Bias b0, int p1, Position.Bias b1, Shape a)
throws BadLocationException {
Shape s0 = modelToView(p0, a, b0);
Shape s1;
if (p1 == getEndOffset()) {
try {
s1 = modelToView(p1, a, b1);
} catch (BadLocationException ble) {
s1 = null;
}
if (s1 == null) {
// Assume extends left to right.
Rectangle alloc = (a instanceof Rectangle) ? (Rectangle) a : a.getBounds();
s1 = new Rectangle(alloc.x + alloc.width - 1, alloc.y, 1, alloc.height);
}
} else {
s1 = modelToView(p1, a, b1);
}
Rectangle r0 = s0 instanceof Rectangle ? (Rectangle) s0 : s0.getBounds();
Rectangle r1 = s1 instanceof Rectangle ? (Rectangle) s1 : s1.getBounds();
if (r0.y != r1.y) {
// If it spans lines, force it to be the width of the view.
Rectangle alloc = (a instanceof Rectangle) ? (Rectangle) a : a.getBounds();
r0.x = alloc.x;
r0.width = alloc.width;
}
r0.add(r1);
// The next line is the only difference between this method and
// View's implementation. We're subtracting the width of the second
// character. This is because this method is used by Highlighter
// implementations to get the area to "highlight", and if we don't do
// this, one character too many is highlighted thanks to our
// modelToView() implementation returning the actual width of the
// character requested!
if (p1 > p0) {
r0.width -= r1.width;
}
return r0;
}
