Add edge without shifting other nodes? about graphview HOT 4 CLOSED

Thanks @waj334

Its an interesting concept, would you be able to give me a working gist so that I can test and correct the implementation

from graphview.

I doubt you'd need the whole implementation of my drag and drop, so you could probably replicate the behavior by just adding a node from the onDragStart function on a Draggable and removing it in onDragCompleted.

I think for my use case though, I want to not have the nodes automatically positioned so that I can allow the user to place them where ever they want. I assume I need a custom Layout that just does nothing?

from graphview.

I called right. Using a Layout that does nothing is exactly what I wanted.

class DumbGraphAlgorithm implements Layout {
DumbGraphAlgorithm({this.renderer}) {
renderer = renderer ?? ArrowEdgeRenderer();
}

@OverRide
EdgeRenderer renderer;

@OverRide
Size run(Graph graph, double shiftX, double shiftY) {
return calculateGraphSize(graph);
}

@OverRide
void setFocusedNode(Node node) {
//Do nothing
}

Size calculateGraphSize(Graph graph) {
var left = double.infinity;
var top = double.infinity;
var right = double.negativeInfinity;
var bottom = double.negativeInfinity;

graph.nodes.forEach((node) {
  left = min(left, node.x);
  top = min(top, node.y);
  right = max(right, node.x + node.width);
  bottom = max(bottom, node.y + node.height);
});

return Size(right - left, bottom - top);

}
}

from graphview.

Nice

from graphview.