1182b7b55d
- Implement PDF and PDF thumbnail generation with incremental loading - Add UI refresh mechanism (tick counter + RefreshView message) - Improve fl! macro with named parameters - Clean up code organization (mod.rs: wiring, model.rs: state only)
90 lines
3 KiB
Rust
90 lines
3 KiB
Rust
// SPDX-License-Identifier: GPL-3.0-or-later
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// src/app/view/panel_pages.rs
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//
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// Page thumbnail panel for multi-page documents (PDF, multi-page TIFF).
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use cosmic::iced::{Alignment, Length};
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use cosmic::widget::{button, column, scrollable, text};
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use cosmic::widget::image as cosmic_image;
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use cosmic::Element;
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use crate::app::{AppMessage, AppModel};
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use crate::constant::THUMBNAIL_MAX_WIDTH;
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use crate::fl;
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/// Content for the page navigation panel (COSMIC nav_bar).
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/// Returns None if the current document doesn't support multiple pages.
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pub fn pages_panel(model: &AppModel) -> Option<Element<'static, AppMessage>> {
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let doc = model.document.as_ref()?;
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// Only show for multi-page documents.
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if !doc.is_multi_page() {
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return None;
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}
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let page_count = doc.page_count()?;
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let loaded = doc.thumbnails_loaded();
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let current_page = doc.current_page()?;
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let mut content = column::with_capacity(page_count as usize + 1)
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.spacing(12)
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.padding([12, 8])
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.align_x(Alignment::Center)
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.width(Length::Fill);
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// Show loading progress if not all thumbnails are ready.
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if !doc.thumbnails_ready() {
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let loading_msg = fl!("loading-thumbnails", current: loaded, total: page_count);
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content = content.push(text::caption(loading_msg));
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}
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// Build thumbnail list for pages that are already loaded.
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for page_index in 0..loaded {
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let is_current = page_index == current_page;
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// Get cached thumbnail handle.
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let thumbnail_element: Element<'static, AppMessage> =
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if let Some(handle) = doc.get_thumbnail(page_index) {
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cosmic_image::Image::new(handle)
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.width(Length::Fixed(THUMBNAIL_MAX_WIDTH))
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.into()
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} else {
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// Fallback: show page number if no thumbnail.
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text::body(format!("{}", page_index + 1)).into()
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};
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// Page number label.
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let page_label = text::caption(format!("{}", page_index + 1));
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// Combine thumbnail and label in a column.
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let page_content = column::with_capacity(2)
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.spacing(4)
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.align_x(Alignment::Center)
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.push(thumbnail_element)
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.push(page_label);
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// Wrap in button for navigation.
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let page_button = if is_current {
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// Current page: highlighted style.
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button::custom(page_content)
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.class(cosmic::theme::Button::Suggested)
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.padding(4)
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} else {
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// Other pages: clickable with standard style.
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button::custom(page_content)
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.class(cosmic::theme::Button::Standard)
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.padding(4)
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.on_press(AppMessage::GotoPage(page_index))
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};
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content = content.push(page_button);
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}
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// Wrap in scrollable container.
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Some(
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scrollable(content)
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.width(Length::Shrink)
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.height(Length::Fill)
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.into(),
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)
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}
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