/**
* Iterate over the lines represented by the child elements of the element this view represents,
* looking for the line that is the longest. The <em>longLine</em> variable is updated to
* represent the longest line contained. The <em>font</em> variable is updated to indicate the
* font used to calculate the longest line.
*/
void calculateLongestLine() {
Component c = getContainer();
font = c.getFont();
metrics = c.getFontMetrics(font);
tabSize = getTabSize() * metrics.charWidth(' ');
Element lines = getElement();
int n = lines.getElementCount();
for (int i = 0; i < n; i++) {
Element line = lines.getElement(i);
float w = getLineWidth(i);
if (w > longLineWidth) {
longLineWidth = w;
longLine = line;
}
}
}
@Override
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
int titleHeight = getTitleHeight(c);
// create image with vertical gradient and then use alpha composite to
// render the image with a horizontal fade
BufferedImage titleImage = Utilities.createTranslucentImage(width, titleHeight);
GradientPaint gradient =
new GradientPaint(
0, 0, titleGradientColors[0], 0, titleHeight, titleGradientColors[1], false);
Graphics2D g2 = (Graphics2D) titleImage.getGraphics();
g2.setPaint(gradient);
g2.fillRoundRect(x, y, width, height, 10, 10);
g2.setColor(Utilities.deriveColorHSB(titleGradientColors[1], 0, 0, -.2f));
g2.drawLine(x + 1, titleHeight - 1, width - 2, titleHeight - 1);
g2.setColor(Utilities.deriveColorHSB(titleGradientColors[1], 0, -.5f, .5f));
g2.drawLine(x + 1, titleHeight, width - 2, titleHeight);
g2.setPaint(
new GradientPaint(
0, 0, new Color(0.0f, 0.0f, 0.0f, 1.0f), width, 0, new Color(0.0f, 0.0f, 0.0f, 0.0f)));
g2.setComposite(AlphaComposite.DstIn);
g2.fillRect(x, y, width, titleHeight);
g2.dispose();
g.drawImage(titleImage, x, y, c);
// draw rounded border
super.paintBorder(c, g, x, y, width, height);
// draw title string
g2 = (Graphics2D) g;
g2.setRenderingHint(
RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
g2.setColor(c.getForeground());
g2.setFont(c.getFont());
FontMetrics metrics = c.getFontMetrics(c.getFont());
g2.drawString(title, x + 8, y + (titleHeight - metrics.getHeight()) / 2 + metrics.getAscent());
}
/**
* Fetches the font metrics associated with the component hosting this view.
*
* @return the metrics
*/
protected FontMetrics getFontMetrics() {
Component c = getContainer();
return c.getFontMetrics(c.getFont());
}
final void updateMetrics() {
Component host = getContainer();
Font f = host.getFont();
metrics = host.getFontMetrics(f); // Metrics for the default font.
tabSize = getTabSize() * metrics.charWidth('m');
}
protected int getTitleHeight(Component c) {
FontMetrics metrics = c.getFontMetrics(c.getFont());
return (int) (metrics.getHeight() * 1.80);
}
