Nate Butler
097032327d
Adds the ability to have some effect run when a selection changes in a
picker.
If the `PickerDelegate` implements something other than `None` for
`selected_index_changed` then each time the selection changes it will
run that effect.
For example:
```rs
impl PickerDelegate for PromptManagerDelegate {
//...
fn selected_index_changed(
&self,
ix: usize,
cx: &mut ViewContext<Picker<Self>>,
) -> Option<Box<dyn Fn(&mut WindowContext) + 'static>> {
Some(self.prompt_manager.set_active_prompt(ix, cx))
}
//...
}
```
This isn't currently used in any picker, but I'm adding this to allow
the functionality we intended for the prompt library, we're changing
selections, activates a preview in the right column.
This will be useful for building any sort of UI where there's a picker
on the left and a preview on the right, such as a UI like them
telescope.
Release Notes:
- N/A
Zed
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