dais_ui/presenter/
next_preview.rs

1//! Next slide preview thumbnail.
2//!
3//! Shows a preview of the next slide/overlay in the presenter's right-top panel.
4
5use crate::widgets::SlideThumbnail;
6use dais_document::page::RenderedPage;
7
8/// Manages the next-slide preview.
9pub struct NextPreviewPanel {
10    thumbnail: SlideThumbnail,
11}
12
13impl NextPreviewPanel {
14    pub fn new() -> Self {
15        Self { thumbnail: SlideThumbnail::new() }
16    }
17
18    /// Update with the next page's rendered data.
19    pub fn update(&mut self, ctx: &egui::Context, page: &RenderedPage, page_index: usize) {
20        self.thumbnail.update(ctx, page, page_index);
21    }
22
23    /// Render the preview in the given area.
24    pub fn show(&self, ui: &mut egui::Ui, area: egui::Rect) {
25        let mut child_ui = ui.new_child(
26            egui::UiBuilder::new()
27                .max_rect(area)
28                .layout(egui::Layout::centered_and_justified(egui::Direction::TopDown)),
29        );
30
31        // Header
32        child_ui.scope_builder(
33            egui::UiBuilder::new()
34                .max_rect(egui::Rect::from_min_size(area.min, egui::vec2(area.width(), 20.0))),
35            |ui| {
36                ui.colored_label(egui::Color32::GRAY, "Next");
37            },
38        );
39
40        let content_area = egui::Rect::from_min_size(
41            area.min + egui::vec2(0.0, 20.0),
42            egui::vec2(area.width(), (area.height() - 20.0).max(1.0)),
43        );
44
45        let padding = egui::vec2(8.0, 4.0);
46        let available = egui::vec2(
47            (content_area.width() - padding.x * 2.0).max(1.0),
48            (content_area.height() - padding.y * 2.0).max(1.0),
49        );
50
51        let mut inner = child_ui.new_child(
52            egui::UiBuilder::new()
53                .max_rect(content_area)
54                .layout(egui::Layout::centered_and_justified(egui::Direction::TopDown)),
55        );
56        self.thumbnail.show(&mut inner, available);
57    }
58
59    /// Show a "no next slide" placeholder.
60    pub fn show_empty(&self, ui: &mut egui::Ui, area: egui::Rect) {
61        let mut child_ui = ui.new_child(
62            egui::UiBuilder::new()
63                .max_rect(area)
64                .layout(egui::Layout::centered_and_justified(egui::Direction::TopDown)),
65        );
66        child_ui.colored_label(egui::Color32::from_gray(100), "End of presentation");
67    }
68}
69
70impl Default for NextPreviewPanel {
71    fn default() -> Self {
72        Self::new()
73    }
74}
dais_ui/presenter/next_preview.rs

dais_ui/presenter/
next_preview.rs
