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Implement pure version of PaneGrid widget

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This commit is contained in:
Héctor Ramón Jiménez 2022-03-10 19:25:57 +07:00
parent 9f27969d14
commit 6dd187ff08
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GPG key ID: 140CC052C94F138E
13 changed files with 2107 additions and 417 deletions
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17
pure/src/widget/tree.rs
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@ -41,6 +41,19 @@ impl Tree {
pub fn diff_children<Message, Renderer>(
&mut self,
new_children: &[Element<'_, Message, Renderer>],
) {
self.diff_children_custom(
new_children,
|new, child_state| child_state.diff(new),
Self::new,
)
}
pub fn diff_children_custom<T>(
&mut self,
new_children: &[T],
diff: impl Fn(&T, &mut Tree),
new_state: impl Fn(&T) -> Self,
) {
if self.children.len() > new_children.len() {
self.children.truncate(new_children.len());
@ -49,12 +62,12 @@ impl Tree {
for (child_state, new) in
self.children.iter_mut().zip(new_children.iter())
{
child_state.diff(new);
diff(new, child_state);
}
if self.children.len() < new_children.len() {
self.children.extend(
new_children[self.children.len()..].iter().map(Self::new),
new_children[self.children.len()..].iter().map(new_state),
);
}
}