Code
class IsoscelesTrapezoidTabbedPaneUI extends BasicTabbedPaneUI {
private static final int ADJ2 = 3;
private final Color selectedTabColor = UIManager.getColor("TabbedPane.selected");
private final Color tabBackgroundColor = Color.LIGHT_GRAY;
private final Color tabBorderColor = Color.GRAY;
@Override protected void paintTabArea(Graphics g, int tabPlacement, int selectedIndex) {
int tabCount = tabPane.getTabCount();
Rectangle iconRect = new Rectangle(),
textRect = new Rectangle();
Rectangle clipRect = g.getClipBounds();
for (int i = runCount - 1; i >= 0; i--) {
int start = tabRuns[i];
int next = tabRuns[(i == runCount - 1) ? 0 : i + 1];
int end = next != 0 ? next - 1 : tabCount - 1; //NOPMD
// for (int j = start; j <= end; j++) {
// https://stackoverflow.com/questions/41566659/tabs-rendering-order-in-custom-jtabbedpane
for (int j = end; j >= start; j--) {
if (j != selectedIndex && rects[j].intersects(clipRect)) {
paintTab(g, tabPlacement, rects, j, iconRect, textRect);
}
}
}
if (selectedIndex >= 0 && rects[selectedIndex].intersects(clipRect)) {
paintTab(g, tabPlacement, rects, selectedIndex, iconRect, textRect);
}
}
@Override protected void paintTabBorder(Graphics g, int tabPlacement, int tabIndex,
int x, int y, int w, int h, boolean isSelected) {
// Do nothing
}
@Override protected void paintFocusIndicator(
Graphics g, int tabPlacement, Rectangle[] rects, int tabIndex,
Rectangle iconRect, Rectangle textRect, boolean isSelected) {
// Do nothing
}
@Override protected void paintContentBorderTopEdge(
Graphics g, int tabPlacement, int selectedIndex, int x, int y, int w, int h) {
super.paintContentBorderTopEdge(g, tabPlacement, selectedIndex, x, y, w, h);
Rectangle selRect = getTabBounds(selectedIndex, calcRect);
Graphics2D g2 = (Graphics2D) g.create();
g2.setColor(selectedTabColor);
g2.drawLine(selRect.x - ADJ2 + 1, y, selRect.x + selRect.width + ADJ2 - 1, y);
g2.dispose();
}
@Override protected void paintTabBackground(Graphics g, int tabPlacement, int tabIndex,
int x, int y, int w, int h, boolean isSelected) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
int textShiftOffset = isSelected ? 0 : 1;
Rectangle clipRect = g2.getClipBounds();
clipRect.grow(ADJ2 + 1, 0);
g2.setClip(clipRect);
GeneralPath trapezoid = new GeneralPath();
trapezoid.moveTo(x - ADJ2, y + h);
trapezoid.lineTo(x + ADJ2, y + textShiftOffset);
trapezoid.lineTo(x + w - ADJ2, y + textShiftOffset);
trapezoid.lineTo(x + w + ADJ2, y + h);
//trapezoid.closePath();
g2.setColor(isSelected ? selectedTabColor : tabBackgroundColor);
g2.fill(trapezoid);
g2.setColor(tabBorderColor);
g2.draw(trapezoid);
g2.dispose();
}
}
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