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Fix List lifetime issues

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Add a new lifetime for the items inside the list
This commit is contained in:
Florian Dehau 2017-09-03 13:06:10 +02:00
parent 7749e5ee35
commit d6a91d1865
3 changed files with 72 additions and 68 deletions
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25
examples/demo.rs
View file

@ -363,18 +363,19 @@ fn draw_charts(t: &mut Terminal<MouseBackend>, app: &App, area: &Rect) {
let warning_style = Style::default().fg(Color::Yellow);
let error_style = Style::default().fg(Color::Magenta);
let critical_style = Style::default().fg(Color::Red);
List::new(app.events
.iter()
.map(|&(evt, level)| {
Item::StyledData(format!("{}: {}", level, evt), match level {
"ERROR" => &error_style,
"CRITICAL" => &critical_style,
"WARNING" => &warning_style,
_ => &info_style,
})
}))
.block(Block::default().borders(border::ALL).title("List"))
.render(t, &chunks[1]);
let events = app.events
.iter()
.map(|&(evt, level)| {
Item::StyledData(format!("{}: {}", level, evt), match level {
"ERROR" => &error_style,
"CRITICAL" => &critical_style,
"WARNING" => &warning_style,
_ => &info_style,
})
});
List::new(events)
.block(Block::default().borders(border::ALL).title("List"))
.render(t, &chunks[1]);
});
BarChart::default()
.block(Block::default().borders(border::ALL).title("Bar chart"))

23
examples/list.rs
View file

@ -169,18 +169,21 @@ fn draw(t: &mut Terminal<MouseBackend>, app: &App) {
.highlight_style(Style::default().fg(Color::Yellow).modifier(Modifier::Bold))
.highlight_symbol(">")
.render(t, &chunks[0]);
List::new(app.events
.iter()
.map(|&(evt, level)| {
Item::StyledData(format!("{}: {}", level, evt), match level {
"ERROR" => &app.error_style,
"CRITICAL" => &app.critical_style,
"WARNING" => &app.warning_style,
_ => &app.info_style,
})
}))
{
let events = app.events
.iter()
.map(|&(evt, level)| {
Item::StyledData(format!("{}: {}", level, evt), match level {
"ERROR" => &app.error_style,
"CRITICAL" => &app.critical_style,
"WARNING" => &app.warning_style,
_ => &app.info_style,
})
});
List::new(events)
.block(Block::default().borders(border::ALL).title("List"))
.render(t, &chunks[1]);
}
});
t.draw().unwrap();

92
src/widgets/list.rs
View file

@ -9,23 +9,23 @@ use widgets::{Widget, Block};
use layout::Rect;
use style::Style;
pub enum Item<'a, D: 'a> {
pub enum Item<'i, D: 'i> {
Data(D),
StyledData(D, &'a Style),
StyledData(D, &'i Style),
}
pub struct List<'a, L, D: 'a>
where L: Iterator<Item = Item<'a, D>>
pub struct List<'b, 'i, L, D: 'i>
where L: Iterator<Item = Item<'i, D>>
{
block: Option<Block<'a>>,
block: Option<Block<'b>>,
items: L,
style: Style,
}
impl<'a, L, D> Default for List<'a, L, D>
where L: Iterator<Item = Item<'a, D>> + Default
impl<'b, 'i, L, D> Default for List<'b, 'i, L, D>
where L: Iterator<Item = Item<'i, D>> + Default
{
fn default() -> List<'a, L, D> {
fn default() -> List<'b, 'i, L, D> {
List {
block: None,
items: L::default(),
@ -34,10 +34,10 @@ impl<'a, L, D> Default for List<'a, L, D>
}
}
impl<'a, L, D> List<'a, L, D>
where L: Iterator<Item = Item<'a, D>>
impl<'b, 'i, L, D> List<'b, 'i, L, D>
where L: Iterator<Item = Item<'i, D>>
{
pub fn new(items: L) -> List<'a, L, D> {
pub fn new(items: L) -> List<'b, 'i, L, D> {
List {
block: None,
items: items,
@ -45,26 +45,26 @@ impl<'a, L, D> List<'a, L, D>
}
}
pub fn block(&'a mut self, block: Block<'a>) -> &mut List<'a, L, D> {
pub fn block(&'b mut self, block: Block<'b>) -> &mut List<'b, 'i, L, D> {
self.block = Some(block);
self
}
pub fn items<I: IntoIterator<Item = Item<'a, D>>>(&'a mut self,
items: L)
-> &mut List<'a, L, D> {
self.items = items;
pub fn items<I>(&'b mut self, items: I) -> &mut List<'b, 'i, L, D>
where I: IntoIterator<Item = Item<'i, D>, IntoIter = L>
{
self.items = items.into_iter();
self
}
pub fn style(&'a mut self, style: Style) -> &mut List<'a, L, D> {
pub fn style(&'b mut self, style: Style) -> &mut List<'b, 'i, L, D> {
self.style = style;
self
}
}
impl<'a, L, D> Widget for List<'a, L, D>
where L: Iterator<Item = Item<'a, D>>,
impl<'b, 'i, L, D> Widget for List<'b, 'i, L, D>
where L: Iterator<Item = Item<'i, D>>,
D: Display
{
fn draw(&mut self, area: &Rect, buf: &mut Buffer) {
@ -126,10 +126,10 @@ impl<'a, L, D> Widget for List<'a, L, D>
/// .highlight_symbol(">>");
/// # }
/// ```
pub struct SelectableList<'a> {
block: Option<Block<'a>>,
pub struct SelectableList<'b> {
block: Option<Block<'b>>,
/// Items to be displayed
items: Vec<&'a str>,
items: Vec<&'b str>,
/// Index of the one selected
selected: Option<usize>,
/// Base style of the widget
@ -137,11 +137,11 @@ pub struct SelectableList<'a> {
/// Style used to render selected item
highlight_style: Style,
/// Symbol in front of the selected item (Shift all items to the right)
highlight_symbol: Option<&'a str>,
highlight_symbol: Option<&'b str>,
}
impl<'a> Default for SelectableList<'a> {
fn default() -> SelectableList<'a> {
impl<'b> Default for SelectableList<'b> {
fn default() -> SelectableList<'b> {
SelectableList {
block: None,
items: Vec::new(),
@ -153,41 +153,41 @@ impl<'a> Default for SelectableList<'a> {
}
}
impl<'a> SelectableList<'a> {
pub fn block(&'a mut self, block: Block<'a>) -> &mut SelectableList<'a> {
impl<'b> SelectableList<'b> {
pub fn block(&'b mut self, block: Block<'b>) -> &mut SelectableList<'b> {
self.block = Some(block);
self
}
pub fn items<I>(&'a mut self, items: &'a [I]) -> &mut SelectableList<'a>
where I: AsRef<str> + 'a
pub fn items<I>(&'b mut self, items: &'b [I]) -> &mut SelectableList<'b>
where I: AsRef<str> + 'b
{
self.items = items.iter().map(|i| i.as_ref()).collect::<Vec<&str>>();
self
}
pub fn style(&'a mut self, style: Style) -> &mut SelectableList<'a> {
pub fn style(&'b mut self, style: Style) -> &mut SelectableList<'b> {
self.style = style;
self
}
pub fn highlight_symbol(&'a mut self, highlight_symbol: &'a str) -> &mut SelectableList<'a> {
pub fn highlight_symbol(&'b mut self, highlight_symbol: &'b str) -> &mut SelectableList<'b> {
self.highlight_symbol = Some(highlight_symbol);
self
}
pub fn highlight_style(&'a mut self, highlight_style: Style) -> &mut SelectableList<'a> {
pub fn highlight_style(&'b mut self, highlight_style: Style) -> &mut SelectableList<'b> {
self.highlight_style = highlight_style;
self
}
pub fn select(&'a mut self, index: usize) -> &'a mut SelectableList<'a> {
pub fn select(&'b mut self, index: usize) -> &'b mut SelectableList<'b> {
self.selected = Some(index);
self
}
}
impl<'a> Widget for SelectableList<'a> {
impl<'b> Widget for SelectableList<'b> {
fn draw(&mut self, area: &Rect, buf: &mut Buffer) {
let list_area = match self.block {
@ -214,17 +214,17 @@ impl<'a> Widget for SelectableList<'a> {
};
// Render items
List::new(self.items
.iter()
.enumerate()
.map(|(i, item)| if i == selected {
Item::StyledData(format!("{} {}", highlight_symbol, item),
highlight_style)
} else {
Item::StyledData(format!("{} {}", blank_symbol, item), &self.style)
})
.skip(offset as usize))
.block(self.block.unwrap_or_default())
.draw(area, buf);
let items = self.items
.iter()
.enumerate()
.map(|(i, item)| if i == selected {
Item::StyledData(format!("{} {}", highlight_symbol, item), highlight_style)
} else {
Item::StyledData(format!("{} {}", blank_symbol, item), &self.style)
})
.skip(offset as usize);
List::new(items)
.block(self.block.unwrap_or_default())
.draw(area, buf);
}
}