Implement zoom control functionality for fixed-layout e-books

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This commit adds comprehensive zoom control capabilities for fixed-layout
e-book content, allowing users to zoom in, out, and reset zoom levels for
better readability and content inspection.

Key features added:
- Zoom control UI with +/- buttons and percentage display
- Keyboard shortcuts for zoom operations (Ctrl/Cmd +, -, 0)
- Mouse wheel zoom with Ctrl/Cmd modifier key
- Drag-to-pan functionality when zoomed in
- Smooth zoom transitions and state management
- Zoom constraints (min/max limits) to prevent over-zooming

Changes include:
- FixedLayout: Enhanced with zoom state management, drag handlers,
  and keyboard/mouse event listeners for intuitive zoom control
- Reader UI: Added zoom control toolbar with visual feedback
- FixedLayout renderer integration with reader zoom controls

The zoom controls provide a seamless experience for users who need to
examine fixed-layout content more closely or adjust content size for
their preferred reading experience.

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This commit is contained in:

john-okeefe

2026-04-16 21:37:54 -04:00

parent 76dcd8f0f7

commit 3f9ab7528b

3 changed files with 1306 additions and 621 deletions

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fixed-layout.js

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