codice:
/**
* 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 (getTitle() == null || getTitle().equals("")) {
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));
Font font = g.getFont();
Color color = g.getColor();
g.setFont(getFont(c));
FontMetrics fm = g.getFontMetrics();
int fontHeight = fm.getHeight();
int descent = fm.getDescent();
int ascent = fm.getAscent();
int diff;
int stringWidth = fm.stringWidth(getTitle());
Insets insets;
if (border != null) {
insets = border.getBorderInsets(c);
} else {
insets = new Insets(0, 0, 0, 0);
}
int titlePos = getTitlePosition();
switch (titlePos) {
case ABOVE_TOP:
diff = ascent + descent + (Math.max(EDGE_SPACING,
TEXT_SPACING*2) - EDGE_SPACING);
grooveRect.y += diff;
grooveRect.height -= diff;
textLoc.y = grooveRect.y - (descent + TEXT_SPACING);
break;
case TOP:
case DEFAULT_POSITION:
diff = Math.max(0, ((ascent/2) + TEXT_SPACING) - EDGE_SPACING);
grooveRect.y += diff;
grooveRect.height -= diff;
textLoc.y = (grooveRect.y - descent) +
(insets.top + ascent + descent)/2;
break;
case BELOW_TOP:
textLoc.y = grooveRect.y + insets.top + ascent + TEXT_SPACING;
break;
case ABOVE_BOTTOM:
textLoc.y = (grooveRect.y + grooveRect.height) -
(insets.bottom + descent + TEXT_SPACING);
break;
case BOTTOM:
grooveRect.height -= fontHeight/2;
textLoc.y = ((grooveRect.y + grooveRect.height) - descent) +
((ascent + descent) - insets.bottom)/2;
break;
case BELOW_BOTTOM:
grooveRect.height -= fontHeight;
textLoc.y = grooveRect.y + grooveRect.height + ascent +
TEXT_SPACING;
break;
}
int justification = getTitleJustification();
if(isLeftToRight(c)) {
if(justification==LEADING ||
justification==DEFAULT_JUSTIFICATION) {
justification = LEFT;
}
else if(justification==TRAILING) {
justification = RIGHT;
}
}
else {
if(justification==LEADING ||
justification==DEFAULT_JUSTIFICATION) {
justification = RIGHT;
}
else if(justification==TRAILING) {
justification = LEFT;
}
}
switch (justification) {
case LEFT:
textLoc.x = grooveRect.x + TEXT_INSET_H + insets.left;
break;
case RIGHT:
textLoc.x = (grooveRect.x + grooveRect.width) -
(stringWidth + TEXT_INSET_H + insets.right);
break;
case CENTER:
textLoc.x = grooveRect.x +
((grooveRect.width - stringWidth) / 2);
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 (((titlePos == TOP || titlePos == DEFAULT_POSITION) &&
(grooveRect.y > textLoc.y - ascent)) ||
(titlePos == BOTTOM &&
(grooveRect.y + grooveRect.height < textLoc.y + descent))) {
Rectangle clipRect = new Rectangle();
// save original clip
Rectangle saveClip = g.getClipBounds();
// paint strip left of text
clipRect.setBounds(saveClip);
if (computeIntersection(clipRect, x, y, textLoc.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, textLoc.x+stringWidth+1, y,
x+width-(textLoc.x+stringWidth+1), height)) {
g.setClip(clipRect);
border.paintBorder(c, g, grooveRect.x, grooveRect.y,
grooveRect.width, grooveRect.height);
}
if (titlePos == TOP || titlePos == DEFAULT_POSITION) {
// paint strip below text
clipRect.setBounds(saveClip);
if (computeIntersection(clipRect, textLoc.x-1, textLoc.y+descent,
stringWidth+2, y+height-textLoc.y-descent)) {
g.setClip(clipRect);
border.paintBorder(c, g, grooveRect.x, grooveRect.y,
grooveRect.width, grooveRect.height);
}
} else { // titlePos == BOTTOM
// paint strip above text
clipRect.setBounds(saveClip);
if (computeIntersection(clipRect, textLoc.x-1, y,
stringWidth+2, textLoc.y - ascent - y)) {
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);
}
}
g.setColor(getTitleColor());
g.drawString(getTitle(), textLoc.x, textLoc.y);
g.setFont(font);
g.setColor(color);
}
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