Bug 505634

Summary:	Selecting elements in a large graph has a delay
Product:	[Tools] GEF	Reporter:	Christian B. <cmbspam>
Component:	GEF Zest	Assignee:	gef-inbox <gef-inbox>
Status:	NEW ---	QA Contact:
Severity:	normal
Priority:	P3	CC:	m.pohl
Version:	unspecified
Target Milestone:	---
Hardware:	PC
OS:	Windows 10
Whiteboard:

Description Christian B.

2016-10-10 07:32:17 EDT

When selecting nodes or edges in a large graph, certain actions have a delay while others happen instantly. The following could be observed with a graph with 250 nodes and 1000 edges. The GEF version is 5.0 Milestone 2.

Selecting a node with nothing previously selected has a delay.
Selecting a node when another one is already selected has no delay.
Deselecting one or multiple nodes (clicking on an empty spot) has a delay.
When selecting multiple nodes, the selection rectangle appears with a delay but selection after releasing the mouse button is instant.
The same goes for edges. Switching between edges and nodes also has a small delay.

Comment 1 Marc Pohl

2019-02-13 03:11:09 EST

(GEF MVC FX 5.0.2)

I managed to get rid of the selection/deselection delay by modifying the default FocusBehavior (coming from GEF MVC FX).

The methods #addViewerFocusedFeedback() and #removeViewerFocusedFeedback always change the whole style of the underlying viewer's Canvas. After removing the style change the delay was gone and of course the blue focus-border as well.

This is no solution anyways, but it may help to fix this issue or help others who don't need the blue border.