ae1a83f095
The motivation behind this PR is to make it so a `HistoryCell` is more like a `WidgetRef` that knows how to render itself into a `Rect` so that it can be backed by something other than a `Vec<Line>`. Because a `HistoryCell` is intended to appear in a scrollable list, we want to ensure the stack of cells can be scrolled one `Line` at a time even if the `HistoryCell` is not backed by a `Vec<Line>` itself. To this end, we introduce the `CellWidget` trait whose key method is: ``` fn render_window(&self, first_visible_line: usize, area: Rect, buf: &mut Buffer); ``` The `first_visible_line` param is what differs from `WidgetRef::render_ref()`, as a `CellWidget` needs to know the offset into its "full view" at which it should start rendering. The bookkeeping in `ConversationHistoryWidget` has been updated accordingly to ensure each `CellWidget` in the history is rendered appropriately.
33 lines
1.1 KiB
Rust
33 lines
1.1 KiB
Rust
use crate::cell_widget::CellWidget;
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use ratatui::prelude::*;
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/// A simple widget that just displays a list of `Line`s via a `Paragraph`.
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/// This is the default rendering backend for most `HistoryCell` variants.
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#[derive(Clone)]
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pub(crate) struct TextBlock {
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pub(crate) lines: Vec<Line<'static>>,
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}
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impl TextBlock {
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pub(crate) fn new(lines: Vec<Line<'static>>) -> Self {
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Self { lines }
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}
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}
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impl CellWidget for TextBlock {
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fn height(&self, width: u16) -> usize {
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// Use the same wrapping configuration as ConversationHistoryWidget so
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// measurement stays in sync with rendering.
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ratatui::widgets::Paragraph::new(self.lines.clone())
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.wrap(crate::conversation_history_widget::wrap_cfg())
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.line_count(width)
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}
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fn render_window(&self, first_visible_line: usize, area: Rect, buf: &mut Buffer) {
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ratatui::widgets::Paragraph::new(self.lines.clone())
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.wrap(crate::conversation_history_widget::wrap_cfg())
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.scroll((first_visible_line as u16, 0))
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.render(area, buf);
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}
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}
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