private static boolean computeIntersection(Rectangle dest, int rx, int ry, int rw, int rh) {
int x1 = Math.max(rx, dest.x);
int x2 = Math.min(rx + rw, dest.x + dest.width);
int y1 = Math.max(ry, dest.y);
int y2 = Math.min(ry + rh, dest.y + dest.height);
dest.x = x1;
dest.y = y1;
dest.width = x2 - x1;
dest.height = y2 - y1;
if (dest.width <= 0 || dest.height <= 0) {
return false;
}
return true;
}
/**
* Paints the border for the specified component with the specified position and size.
*
* @param c the component for which this border is being painted
* @param g the paint graphics
* @param x the x position of the painted border
* @param y the y position of the painted border
* @param width the width of the painted border
* @param height the height of the painted border
*/
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
Border border = getBorder();
if (label == null) {
if (border != null) {
border.paintBorder(c, g, x, y, width, height);
}
return;
}
Rectangle grooveRect =
new Rectangle(
x + EDGE_SPACING,
y + EDGE_SPACING,
width - (EDGE_SPACING * 2),
height - (EDGE_SPACING * 2));
Dimension labelDim = label.getPreferredSize();
int baseline = label.getBaseline(labelDim.width, labelDim.height);
int ascent = Math.max(0, baseline);
int descent = labelDim.height - ascent;
int diff;
Insets insets;
if (border != null) {
insets = border.getBorderInsets(c);
} else {
insets = new Insets(0, 0, 0, 0);
}
diff = Math.max(0, ascent / 2 + TEXT_SPACING - EDGE_SPACING);
grooveRect.y += diff;
grooveRect.height -= diff;
compLoc.y = grooveRect.y + insets.top / 2 - (ascent + descent) / 2 - 1;
int justification;
if (c.getComponentOrientation().isLeftToRight()) {
justification = LEFT;
} else {
justification = RIGHT;
}
switch (justification) {
case LEFT:
compLoc.x = grooveRect.x + TEXT_INSET_H + insets.left;
break;
case RIGHT:
compLoc.x =
(grooveRect.x + grooveRect.width - (labelDim.width + TEXT_INSET_H + insets.right));
break;
}
// If title is positioned in middle of border AND its fontsize
// is greater than the border's thickness, we'll need to paint
// the border in sections to leave space for the component's background
// to show through the title.
//
if (border != null) {
if (grooveRect.y > compLoc.y - ascent) {
Rectangle clipRect = new Rectangle();
// save original clip
Rectangle saveClip = g.getClipBounds();
// paint strip left of text
clipRect.setBounds(saveClip);
if (computeIntersection(clipRect, x, y, compLoc.x - 1 - x, height)) {
g.setClip(clipRect);
border.paintBorder(
c, g, grooveRect.x, grooveRect.y, grooveRect.width, grooveRect.height);
}
// paint strip right of text
clipRect.setBounds(saveClip);
if (computeIntersection(
clipRect,
compLoc.x + labelDim.width + 1,
y,
x + width - (compLoc.x + labelDim.width + 1),
height)) {
g.setClip(clipRect);
border.paintBorder(
c, g, grooveRect.x, grooveRect.y, grooveRect.width, grooveRect.height);
}
// paint strip below text
clipRect.setBounds(saveClip);
if (computeIntersection(
clipRect,
compLoc.x - 1,
compLoc.y + ascent + descent,
labelDim.width + 2,
y + height - compLoc.y - ascent - descent)) {
g.setClip(clipRect);
border.paintBorder(
c, g, grooveRect.x, grooveRect.y, grooveRect.width, grooveRect.height);
}
// restore clip
g.setClip(saveClip);
} else {
border.paintBorder(c, g, grooveRect.x, grooveRect.y, grooveRect.width, grooveRect.height);
}
label.setLocation(compLoc);
label.setSize(labelDim);
}
}