您可以通過擴展返回UIManager.getIcon的默認圖標,如果樹的單元格渲染器是一個DefaultTreeCellRenderer,你可以在那裏設置新圖標:
static Icon scale(Icon icon, double scaleFactor, JTree tree) {
int width = icon.getIconWidth();
int height = icon.getIconHeight();
width = (int) Math.ceil(width * scaleFactor);
height = (int) Math.ceil(height * scaleFactor);
BufferedImage image =
new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = image.createGraphics();
g.scale(scaleFactor, scaleFactor);
icon.paintIcon(tree, g, 0, 0);
g.dispose();
return new ImageIcon(image);
}
static void updateIcons(JTree tree) {
Font defaultFont = UIManager.getFont("Tree.font");
Font currentFont = tree.getFont();
double newScale = (double)
currentFont.getSize2D()/defaultFont.getSize2D();
DefaultTreeCellRenderer renderer =
(DefaultTreeCellRenderer) tree.getCellRenderer();
renderer.setOpenIcon(
scale(UIManager.getIcon("Tree.openIcon"), newScale, tree));
renderer.setClosedIcon(
scale(UIManager.getIcon("Tree.closedIcon"), newScale, tree));
renderer.setLeafIcon(
scale(UIManager.getIcon("Tree.leafIcon"), newScale, tree));
Collection<Integer> iconSizes = Arrays.asList(
renderer.getOpenIcon().getIconHeight(),
renderer.getClosedIcon().getIconHeight(),
renderer.getLeafIcon().getIconHeight());
// Convert points to pixels
Point2D p = new Point2D.Float(0, currentFont.getSize2D());
FontRenderContext context =
tree.getFontMetrics(currentFont).getFontRenderContext();
context.getTransform().transform(p, p);
int fontSizeInPixels = (int) Math.ceil(p.getY());
tree.setRowHeight(
Math.max(fontSizeInPixels, Collections.max(iconSizes) + 2));
}
縮放節點手柄的圖標可能會更具挑戰性。您可以調用BasicTreeUI的setCollapsedIcon和setExpandedIcon方法,但在放置節點和線時,它似乎沒有考慮到不同的句柄大小。
來源
2013-09-28 13:56:22
VGR
有可能嵌入到運行時的jar文件中,但是您可以使用UIManager來檢索並設置它們 – MadProgrammer