| [Zest] How to change color and labeltext of an edge(connection)? [message #1728564] |
Tue, 05 April 2016 09:18  |
Eclipse User |
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Hey there, another day another question.
I am stumbling around on the topic of modifying edge visualizations.
Since adaptation of node visualization in zest is quite easy by implementing your oun GraphStyleProvider extending LabelProvider and implementing several interface classes. But I had no success on the adaptation of edge visualizations in exception to decorators (implementing IEdgeDecorationProvider). Therefore my question today is: "Is it possible to change the appearance of edges like coloring and edge labels in some manner?
Thank you. I appreciate your help you are doing a nice job!
[Updated on: Tue, 05 April 2016 09:18] by Moderator |
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| Re: [Zest] How to change color and labeltext of an edge(connection)? [message #1728823 is a reply to message #1728564] |
Thu, 07 April 2016 12:12  |
| Eclipse User |
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Hi Christoph,
yes you can change the appearance of edges via JavaFX CSS. In the context of Zest, the CSS can be provided via ZestProperties (ELEMENT_LABEL_CSS_STYLE, ELEMENT_CSS_ID, ELEMENT_CSS_CLASS, EDGE_CURVE_CSS_STYLE) as well as the label (ELEMENT_LABEL, ELEMENT_EXTERNAL_LABEL, EDGE_SOURCE_LABEL, EDGE_TARGET_LABEL). However, we changed the Zest JFace API so the GraphStyleProvider is no longer available and some of the label properties may not be available to you. Nonetheless, there should be a label provider available that can provide attributes for edges (but I do not know the class name off the top of my head) and at least the CSS properties and the ELEMENT_LABEL property should be available.
The new API consists solely of an IGraphContentProvider and an IGraphAttributesProvider. The latter is queried for edge attributes (and graph and node attributes).
Best regards,
Matthias
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| Re: [Zest] How to change color and labeltext of an edge(connection)? [message #1729448 is a reply to message #1729336] |
Thu, 14 April 2016 05:07 |
| Eclipse User |
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Take, for example, the JFaceEdgeDecorationExample, which can be found within o.e.g4.zest.examples.jface, and change the MyLabelProvider#getEdgeAtttributes(...) method as follows to draw the edges in red instead of green:
@Override
public Map<String, Object> getEdgeAttributes(Object sourceNode,
Object targetNode) {
Map<String, Object> edgeAttributes = new HashMap<>();
edgeAttributes.put(ZestProperties.EDGE_SOURCE_DECORATION,
new CircleHead());
edgeAttributes.put(ZestProperties.EDGE_TARGET_DECORATION,
new DiamondHead());
edgeAttributes.put(ZestProperties.EDGE_CURVE_CSS_STYLE,
"-fx-stroke: red;");
return edgeAttributes;
}
I can also create another example to demonstrate how to add a stylesheet, so that only CSS ids or classes would need to be set within the attributes provider if you want.
Regards,
Matthias
[Updated on: Thu, 14 April 2016 05:08] by Moderator |
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| Re: [Zest] How to change color and labeltext of an edge(connection)? [message #1731856 is a reply to message #1731800] |
Tue, 10 May 2016 09:58 |
| Eclipse User |
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Alexander Nyßen wrote on Tue, 10 May 2016 09:12Hi Christoph,
you can call refreshVisuals() on the EdgePart, which would update the visualization based on the attribute values. To obtain an EdgePart for the given Edge model element, you can use the getContentPartMap() of the FXViewer that is contained by the ZestContentViewer. As edges are implicitly created, you will have to search the ContentModel (adapter on the FXViewer) for the Edge model element that you want to refresh.
Regards,
Alexander
Thank you so much. It kinda works but matching the correct components is quite annoying.
I am also facing an interesting NullPointerException:
java.lang.NullPointerException
at org.eclipse.gef4.zest.fx.parts.EdgeContentPart.getGraphLayoutContext(EdgeContentPart.java:284)
at org.eclipse.gef4.zest.fx.parts.EdgeContentPart.doRefreshVisual(EdgeContentPart.java:183)
at org.eclipse.gef4.zest.fx.parts.EdgeContentPart.doRefreshVisual(EdgeContentPart.java:1)
at org.eclipse.gef4.mvc.parts.AbstractVisualPart.refreshVisual(AbstractVisualPart.java:479)
at com.myproject.zest.controller.styleprovider.layout.listener.NodeSelectionListener.handleLayout(NodeSelectionListener.java:80)
My code looks like:
Map contentPartMap = zestContentViewer.getFXViewer().getContentPartMap();
for (Object part : contentPartMap.values()) {
if (part instanceof EdgeContentPart) {
try {
Map<String, Object> a = ((EdgeContentPart) part).getContent().getAttrs();
a.put(ZestProperties.EDGE_CURVE_CSS_STYLE, "-fx-stroke: lightgray;");
((EdgeContentPart) part).refreshVisual();
} catch (NullPointerException e) {
e.printStackTrace();
}
}
}
The idea behind this implementation is to change the coloring of all edges on the fly
[Updated on: Tue, 10 May 2016 10:00] by Moderator |
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