Chapter 4. Reading & Panels

4.1 Opening and progress restore

• Double-click a book card (or select exactly one and press Enter) to open a reader window, maximized automatically.
• Progress is saved automatically on every page/chapter turn and restored on the next open. Semantics per format: text = chapter number, PDF = page number, comic = image index, CHM = always page 1 (position remembered per topic).
• Reading time accrues every 60 seconds while the window is alive; view it via the “Reading Time” sort.
• Re-opening a book focuses its existing window and jumps; clicking a note/mark also focuses an already-open window.

4.2 Text panel (EPUB / MOBI / MD / TXT)

• Content is rendered as typeset HTML: font size, line height, paragraph spacing, alignment, invert and brightness are set in “Settings → Reader” (see 7.2) and apply instantly.
• Paging: arrow keys / PageUp / PageDown switch chapters; scroll within a chapter, and scrolling past the bottom continues into the next chapter.
• Contents sidebar: chapter list (Markdown splits on H1, TXT on 64 KB boundaries); click to jump, current chapter highlighted; the filter box narrows by title.
• Text selection: copy (Ctrl+C), add a note (Ctrl+N), add a mark (Ctrl+B).
• In-content links navigate.

4.3 PDF panel

• Vector rendering with single/two-page views (side-by-side).
• Outline jumps: the sidebar lists the PDF bookmark outline; click to go to that page.
• Zoom: toolbar −/+ or a precise dropdown.
• Per-page text search (sidebar “Search” tab); results jump to pages.
• Text can be selected and copied.

4.4 CHM panel

• Three sidebar tabs: Contents (.hhc tree, expandable/filterable), Index (.hhk keyword list), Search (full-text across topics).
• In-content links navigate; external links (http/mailto) open the system browser.
• The toolbar has no history buttons; navigation relies on the contents/index/search tabs.

4.5 View modes

The toolbar “View Mode” dropdown: Continuous (default, scrolling) / Single page / Two pages. Two-page mode advances in pairs ([1,2]→[3,4]) — ideal for PDF and comics.

4.6 Sidebar search

The sidebar “Search” tab (except comics, see 5.5):

Typing searches live; Enter or the button is an explicit search — an explicit search with no hits shows a centered notice. Click a result to jump.