Add mouse support to ListView

This commit is contained in:
Alexandre Bury 2017-10-12 16:42:34 -07:00
parent 394e61a328
commit f64ce80a58

View File

@ -195,6 +195,49 @@ impl ListView {
Callback::from_fn(move |s| cb(s, &focused_string))
}))
}
fn labels_width(&self) -> usize {
self.children
.iter()
.map(ListChild::label)
.map(UnicodeWidthStr::width)
.max()
.unwrap_or(0)
}
fn check_focus_grab(&mut self, event: &Event) {
if let &Event::Mouse {
offset,
position,
event,
} = event
{
if !event.grabs_focus() {
return;
}
let position = match position.checked_sub(offset) {
None => return,
Some(pos) => pos,
};
if position.y > self.scrollbase.view_height {
return;
}
// eprintln!("Rel pos: {:?}", position);
// Now that we have a relative position, checks for buttons?
let focus = position.y + self.scrollbase.start_line;
if let &mut ListChild::Row(_, ref mut view) =
&mut self.children[focus]
{
if view.take_focus(direction::Direction::none()) {
self.focus = focus;
}
}
}
}
}
fn try_focus(
@ -216,12 +259,7 @@ impl View for ListView {
return;
}
let offset = self.children
.iter()
.map(ListChild::label)
.map(UnicodeWidthStr::width)
.max()
.unwrap_or(0) + 1;
let offset = self.labels_width() + 1;
debug!("Offset: {}", offset);
self.scrollbase
@ -286,13 +324,21 @@ impl View for ListView {
return EventResult::Ignored;
}
// First: some events can move the focus around.
self.check_focus_grab(&event);
// Send the event to the focused child.
let labels_width = self.labels_width();
if let ListChild::Row(_, ref mut view) = self.children[self.focus] {
let result = view.on_event(event.clone());
let y = self.focus - self.scrollbase.start_line;
let offset = (labels_width + 1, y);
let result = view.on_event(event.relativized(offset));
if result.is_consumed() {
return result;
}
}
// If the child ignored this event, change the focus.
match event {
Event::Key(Key::Up) if self.focus > 0 => {
self.move_focus(1, direction::Direction::down())