Question

SWT/JFace 中CheckBoxTreeViewer 子节点部分选中,父节点为半选状态，改用tree+checkox的方式如何实现？

Answer 1

显示图片

Tree tree=new Tree(compA[0],SWT.NONE);//创建树

TreeItem item=new TreeItem(tree,SWT.NONE);

item.setText("音乐");

TreeItem child=new TreeItem(item,SWT.NONE);//在此TreeItem上加入图片

TreeItem child1=new TreeItem(child,SWT.NONE);
TreeItem child2=new TreeItem(child,SWT.NONE);
child1.setText("安静");
child2.setText("简单爱");

TreeEditor editor=new TreeEditor(tree);//创建TreeEditor

editor.horizontalAlignment = SWT.LEFT;

editor.minimumWidth = 50;

CLabel lbl = new CLabel(tree, SWT.SHADOW_OUT);//创建控件，显示图片
lbl.setSize(120, 30);

lbl.setBackground(SWTResourceManager.getImage(TestTree.class, "/images/forward.gif"));
editor.setEditor(lbl, child, 0); //为TreeEditor加在child上，child上加入控件lbl，lbl上显示图片

标签器的几个方法中
getImage 返回的是TreeItem之前的图像
getText 返回的是TreeItem的文本
都不能实现这种要求

充满的话 创建一个Canvas 加上addPaintListener事件 重绘Image

final Canvas lbl = new Canvas(tree, SWT.SHADOW_OUT);

lbl.addPaintListener(new PaintListener()
{
public void paintControl(PaintEvent e) {
Image image=SWTResourceManager.getImage(TestTree.class, "/images/forward.gif");
ImageData data=image.getImageData();
ImageData data1=data.scaledTo(lbl.getSize().x, lbl.getSize().y);
Image im=new Image(e.display,data1);
e.gc.drawImage(im,0,0);
im.dispose();

}
});
editor.setEditor(lbl, child, 0);
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Answer 2

用图片模拟checkbox作为TreeItem的Image
监听鼠标点击事件，更改节点选中更新，并通知重绘~~~