[英]scale size of icons for jtree as it is scaled
我想給我的應用程序的用戶更改以便隨時更改字體大小...但是我可以做些什么來放大或縮小JTree圖標(即節點打開/節點關閉)?...通常我是談論標准(金屬)L&F ......我不清楚這些圖像實際保存在哪里(我在java目錄上快速搜索.gif,.bmp,.png和.jpg無濟於事)。
如果你有一個64 x 64像素的gif,有沒有Java方法可以向上或向下擴展它? 或者我是否必須擁有一組不同大小的圖標文件(gif或png或其他)? java是否提供了一組不同大小的相同圖標(已關閉/打開的JTree文件夾)...或者它是否只允許您選擇一種尺寸的圖標?
您可以縮放UIManager.getIcon返回的默認圖標,如果樹的單元格渲染器是DefaultTreeCellRenderer,您可以在那里設置新圖標:
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));
}
縮放節點句柄圖標可能更具挑戰性。 您可以調用BasicTreeUI的setCollapsedIcon和setExpandedIcon方法,但在放置節點和線時似乎沒有考慮不同的句柄大小。
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