最近發現一個很怪的問題，GEF的PaletteGroup在3.3及以下都有border，而在3.4卻消失了，我覺得好像是GEF 3.4 PaletteViewer的開發者Hudson和Shah認為不可見的邊框更“友好”，可是好多人都不習慣了，覺得是bug了，在給gef newsgroup上一個人回答問題的時候順便把這個hack了一下，效果還不錯，哈哈！下面是步驟：
1 定義一個HackedGroupEditPart:
import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.Graphics;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.MarginBorder;
import org.eclipse.draw2d.geometry.Insets;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.internal.ui.palette.editparts.GroupEditPart;
import org.eclipse.gef.palette.PaletteContainer;
import org.eclipse.jface.action.Separator;
public class HackedGroupEditPart extends GroupEditPart {
public HackedGroupEditPart(PaletteContainer group) {
super(group);
}
@Override
protected void refreshVisuals() {
super.refreshVisuals();
Insets insets = getContentPane().getBorder().getInsets(getContentPane());
getContentPane().setBorder(new MarginBorder(insets){
@Override
public void paint(IFigure figure, Graphics graphics, Insets insets) {
Rectangle r = getPaintRectangle(figure, insets);
r.height--;
graphics.setForegroundColor(ColorConstants.buttonDarker);
graphics.drawLine(r.x, r.bottom(), r.right(), r.bottom());
}
});
}
}
2 使用這個加了邊框的GroupEditPart，在編輯器定義里面重寫 createPaletteViewerProvider 方法，如下：
public class LivingEditor extends GraphicalEditorWithFlyoutPalette {
.
.
@Override
protected PaletteViewerProvider createPaletteViewerProvider() {
return new PaletteViewerProvider(getEditDomain())
{
@Override
public PaletteViewer createPaletteViewer(Composite parent) {
//add border for GroupEditPart
final PaletteEditPartFactory pepf = new PaletteEditPartFactory()
{
@Override
protected EditPart createGroupEditPart(
EditPart parentEditPart, Object model) {
return new HackedGroupEditPart((PaletteContainer)model);
}
};
PaletteViewer pViewer = new PaletteViewer(){
{
setEditPartFactory(pepf);
}
};
pViewer.createControl(parent);
configurePaletteViewer(pViewer);
hookPaletteViewer(pViewer);
return pViewer;
}
};
}
}
我的Palette定義，使用了三個PaletteGroup，但不改一下根本看不出來
group之間的分隔：
public class PaletteProvider {
public static PaletteRoot provide(LivingEditor livingEditor) {
PaletteRoot root = new PaletteRoot();
createStandardTool(root);
createConnectionTool(root);
createModelTool(root);
return root;
}
private static void createModelTool(PaletteRoot root) {
PaletteGroup model_group = new PaletteGroup("model");
CombinedTemplateCreationEntry person_entry = new CombinedTemplateCreationEntry("Person",
"Create a person",
new SimpleFactory(Person.class),
Activator.imageDescriptorFromPlugin(Activator.PLUGIN_ID, "icon/person16.png"),
Activator.imageDescriptorFromPlugin(Activator.PLUGIN_ID, "icon/person24.png")
);
model_group.add(person_entry);
CombinedTemplateCreationEntry dog_entry = new CombinedTemplateCreationEntry("Dog",
"Create a dog",
new SimpleFactory(Dog.class),
Activator.imageDescriptorFromPlugin(Activator.PLUGIN_ID, "icon/dog16.gif"),
Activator.imageDescriptorFromPlugin(Activator.PLUGIN_ID, "icon/dog24.gif"));
model_group.add(dog_entry);
root.add(model_group);
}
private static void createConnectionTool(PaletteRoot root) {
ConnectionCreationToolEntry relation = new ConnectionCreationToolEntry("relation",
"relation between person and dog",
new SimpleFactory(Relation.class),
Activator.imageDescriptorFromPlugin(Activator.PLUGIN_ID, "icon/connection16.gif"),
Activator.imageDescriptorFromPlugin(Activator.PLUGIN_ID, "icon/connection24.gif")
);
PaletteGroup conn_group = new PaletteGroup("relations");
conn_group.add(relation);
root.add(conn_group);
}
private static void createStandardTool(PaletteRoot root) {
PaletteGroup std = new PaletteGroup("Standard");
SelectionToolEntry selection = new SelectionToolEntry();
std.add(selection);
root.add(std);
}
可以看一下修改后的對比：
不過這種方法使用了internal API，不適應版本更新，只適合救急。我已經報告了這個
誤會，3.5應該不會有了。
如果你也有這個困擾，就試試吧。