Hi Jakob,
does the change in Morphic-mt.1441 work for you?
Best, Marcel Am 21.04.2018 13:56:35 schrieb Jakob Reschke forums.jakob@resfarm.de: Hi all,
I wanted to open the yellow button menu on an empty PluggableTreeMorph (the SqueakMap catalog's package list to be precise, but I assume it does not matter) and wanted to do so by pressing the escape key and got the stack trace below.
The scroller of the PluggableTreeMorph is a TransformMorph, but it has no submorphs if the tree is empty. Thus, in numberOfItemsPotentiallyInView the localSubmorphBounds are nil, and even if they were not, the next error would be a division by zero. The TransformMorph does not expect to have no submorphs.
However, the real problem might be (or might not be) that a PluggableTreeMorph behaves differently from a PluggableListMorph in response to pressing Esc. The latter opens the yellow button menu, while the tree morph does not treat Esc specially at all. It uses it for list filtering instead, like any typed character. So effectively, the Esc key in a tree morph is currently the "expand this node and select the first child" key. I like the menu behavior from list morphs better... What is your opinion?
Kind regards, Jakob
UndefinedObject(Object)>>doesNotUnderstand: #height TransformMorph>>numberOfItemsPotentiallyInView PluggableTreeMorph(ScrollPane)>>numSelectionsInView PluggableTreeMorph(SimpleHierarchicalListMorph)>>arrowKey: PluggableTreeMorph(SimpleHierarchicalListMorph)>>specialKeyPressed: PluggableTreeMorph>>specialKeyPressed: PluggableTreeMorph(SimpleHierarchicalListMorph)>>keyStroke: PluggableTreeMorph>>keyStroke: PluggableTreeMorph(Morph)>>handleKeystroke: KeyboardEvent>>sentTo: PluggableTreeMorph(Morph)>>handleEvent: PluggableTreeMorph(Morph)>>handleFocusEvent: MorphicEventDispatcher>>doHandlingForFocusEvent:with: MorphicEventDispatcher>>dispatchFocusEvent:with: PluggableTreeMorph(Morph)>>processFocusEvent:using: PluggableTreeMorph(Morph)>>processFocusEvent: [] in [] in [] in HandMorph>>sendFocusEvent:to:clear: BlockClosure>>ensure: KeyboardEvent(MorphicEvent)>>becomeActiveDuring: [] in [] in HandMorph>>sendFocusEvent:to:clear: