/**
* Paints a highlight.
*
* @param g the graphics context
* @param offs0 the starting model offset >= 0
* @param offs1 the ending model offset >= offs1
* @param bounds the bounding box for the highlight
* @param c the editor
*/
public void paint(Graphics g, int offs0, int offs1, Shape bounds, JTextComponent c) {
Rectangle alloc = bounds.getBounds();
try {
// --- determine locations ---
TextUI mapper = c.getUI();
Rectangle p0 = mapper.modelToView(c, offs0);
Rectangle p1 = mapper.modelToView(c, offs1);
// --- render ---
Color color = getColor();
if (color == null) {
g.setColor(c.getSelectionColor());
} else {
g.setColor(color);
}
if (p0.y == p1.y) {
// same line, render a rectangle
Rectangle r = p0.union(p1);
g.fillRect(r.x, r.y, r.width, r.height);
} else {
// different lines
int p0ToMarginWidth = alloc.x + alloc.width - p0.x;
g.fillRect(p0.x, p0.y, p0ToMarginWidth, p0.height);
if ((p0.y + p0.height) != p1.y) {
g.fillRect(alloc.x, p0.y + p0.height, alloc.width, p1.y - (p0.y + p0.height));
}
g.fillRect(alloc.x, p1.y, (p1.x - alloc.x), p1.height);
}
} catch (BadLocationException e) {
// can't render
}
}
/**
* Paints a portion of a highlight.
*
* @param g the graphics context
* @param offs0 the starting model offset >= 0
* @param offs1 the ending model offset >= offs1
* @param bounds the bounding box of the view, which is not necessarily the region to paint.
* @param c the editor
* @param view View painting for
* @return region drawing occurred in
*/
public Shape paintLayer(
Graphics g, int offs0, int offs1, Shape bounds, JTextComponent c, View view) {
Color color = getColor();
if (color == null) {
g.setColor(c.getSelectionColor());
} else {
g.setColor(color);
}
Rectangle r;
if (offs0 == view.getStartOffset() && offs1 == view.getEndOffset()) {
// Contained in view, can just use bounds.
if (bounds instanceof Rectangle) {
r = (Rectangle) bounds;
} else {
r = bounds.getBounds();
}
} else {
// Should only render part of View.
try {
// --- determine locations ---
Shape shape =
view.modelToView(offs0, Position.Bias.Forward, offs1, Position.Bias.Backward, bounds);
r = (shape instanceof Rectangle) ? (Rectangle) shape : shape.getBounds();
} catch (BadLocationException e) {
// can't render
r = null;
}
}
if (r != null) {
// If we are asked to highlight, we should draw something even
// if the model-to-view projection is of zero width (6340106).
r.width = Math.max(r.width, 1);
g.fillRect(r.x, r.y, r.width, r.height);
}
return r;
}
void union(Shape bounds) {
if (bounds == null) return;
Rectangle alloc;
if (bounds instanceof Rectangle) {
alloc = (Rectangle) bounds;
} else {
alloc = bounds.getBounds();
}
if (width == 0 || height == 0) {
x = alloc.x;
y = alloc.y;
width = alloc.width;
height = alloc.height;
} else {
width = Math.max(x + width, alloc.x + alloc.width);
height = Math.max(y + height, alloc.y + alloc.height);
x = Math.min(x, alloc.x);
width -= x;
y = Math.min(y, alloc.y);
height -= y;
}
}