hideroot | Root check bypasser kernel module

To understand the effects you are observing, it needs understanding on how virtual widgets work in qooxdoo.

Virtual widget means that you are able do display huge amounts of data, only having a few widgets rendering the visible content. Imagine a tree with hundreds of nodes and child nodes, but you only have 10 nodes visible at one time. The virtual widget then instantiates as many real widgets as needed and re-uses those widgets to display the visible part of the tree.

The virtual tree widget, which diplays nodes an leaves of a tree, reuses the instantiated widgets by changing the model of the widget and it's appearance. This way it may happen that on user interaction, a virtual tree node is rendered by an item which formely displayed a leafe.

All this is done via the delegates bindItem member function which is called every time a real widget is re-used for a virtual item. So adding an event listener in bindItem adds subsequent more and more event listeners to a single widget tree/leaf instance, showing the effects you described.

To achieve what you want, you have to add your logic into the configureItem delegate member, which is only called once on instantiation of a tree item widget. There you have to differentiate between the item currently displaying a node or a leaf which you can simply accomplish by getting the current appearance of that item via item.getAppearance(). The result will be either virtual-tree-file for a leaf and virtual-tree-folder for a node.

The event listeners which are added for pointerover and pointerout should then add the styles needed depending on the appearance.

Note all this should better be handeled by a custom appearance theme, where you could add most styles you used based on the widgets states like hover, besides the animation for the label child control with the fading in label.

Please paste the following gist into the qooxdoo playground where I've created an example which demonstrates all the speech above:

https://gist.github.com/level420/ba4e25f98618064f91f5aa6cb6bb1124