Add more gestures for TreeViewItem

[LinHaoLove]

Is your feature request related to a problem? Please describe.

i need show menu for every treeViewItem on windows and macos，by "onSecondaryTap". i need show menu for every treeViewItem on android and ios，by "onLongPress" or "other gestures"

Describe the solution you'd like

return TreeView( selectionMode: TreeViewSelectionMode.single, items: [...], onSecondaryTap: (TreeViewItem item, TapDownDetails details,){ print('onSecondaryTap'); }, onLongPress: (TreeViewItem item){ print('onLongPress'); }, onOtherGestures: (TreeViewItem item){ print('Other Gestures'); }, );

[LinHaoLove]

i put a DropDownButton to content of TreeViewItem，and put text widget with gestures to buttonBuilder of DropDownButton. that is ok!

[WinXaito]

I keep this one open, I'm also interested to have a secondary tap on TreeViewIteams.

[bdlukaa]

I have designed a concept for this. Each TreeViewItem will have a gestures parameter that will take a <Type, GestureRecognizerFactory> map. In the implementation (_TreeViewItem), a the parameter will be passed into a RawGesturesDetector

To use, it'd be something like:

items: [
  TreeViewItem(
    ...,
    gestures: {
      TapGestureRecognizer: GestureRecognizerFactoryWithHandlers<TapGestureRecognizer>(
        () => TapGestureRecognizer(),
        (TapGestureRecognizer instance) {
          instance
            ..onTapDown = (details) {}
            ..onSecondaryTap = () {};
        },
      ),
    },
  ),
],

The records:

• There is no way to add callbacks to every gesture inside TreeViewItem, so this is a viable solution;
• A gesture recognizer would need to be passed to every TreeViewItem. This means we wouldn't have such thing as TreeView.onSecondaryTap(details, item), that would be invoked for every item;
• This option is very verbose for the developer, but I think the cases for these are minimum, so we would just provide the necessary callbacks by default (onTap, onSecondaryTap, onLongPress) - with no further customization -, or we can provide this option with GestureRecognizerFactory

[robkri]

This would be a nice feature!

From the point of view of a user, when I see some tree-like element in a desktop app GUI, I would try out these gestures:

• click
• double click
• right click (secondary click)

In a mobile application I would try out:

• tap
• long press

Long story short: I think onTap, onDoubleTap, onSecondaryTap and onLongPress should be available by default to cover the most common interactions of a user with a tree view.