57 lines
1.7 KiB
Rust
57 lines
1.7 KiB
Rust
use std::fmt;
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pub trait ListView<T: fmt::Display + Clone> {
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// get properties of implementations
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fn selection_pointer(&mut self) -> &mut usize;
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fn list(&mut self) -> &mut Vec<T>;
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fn register(&mut self) -> &mut Option<T>;
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// specific input handling
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fn backspace(&mut self);
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fn append_to_current(&mut self, chr: char);
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fn normal_mode(&mut self);
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fn toggle_current(&mut self);
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// selection manipulation
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fn selection_up(&mut self) {
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*self.selection_pointer() = self.selection_pointer().saturating_sub(1);
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}
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fn selection_down(&mut self) {
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*self.selection_pointer() =
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(*self.selection_pointer() + 1).min(self.list().len().saturating_sub(1));
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}
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// adding/removing elements
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fn insert(&mut self, item: T, position: Option<usize>) {
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let pos = position.unwrap_or(*self.selection_pointer());
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if pos == self.list().len().saturating_sub(1) {
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self.list().push(item);
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*self.selection_pointer() = self.list().len() - 1;
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} else {
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self.list().insert(pos + 1, item);
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*self.selection_pointer() = pos + 1;
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}
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}
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fn remove_current(&mut self) {
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if self.list().is_empty() {
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return;
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}
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let index = *self.selection_pointer();
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*self.selection_pointer() = index.min(self.list().len().saturating_sub(2));
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*self.register() = self.list().remove(index).into();
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}
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fn paste(&mut self) {
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if let Some(item) = self.register().clone() {
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self.insert(item, None);
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}
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}
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// printing
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fn printable(&mut self) -> Vec<String> {
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self.list().iter().map(T::to_string).collect()
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}
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}
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