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feat(viewer): implement keyboard and button zoom/pan controls

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- Fork cosmic::iced viewer widget to enable external state control
- Add bidirectional state synchronization between viewer and AppModel
- Implement ViewerStateChanged message for mouse interaction feedback
- Fix pixel-perfect rendering at 100% zoom (ActualSize mode)
- Ensure smooth interaction between mouse, keyboard, and button controls

This allows zoom/pan to work via:
- Keyboard shortcuts (+/-, Ctrl+arrows)
- Future toolbar buttons
- Mouse wheel and drag (existing functionality preserved)

The viewer state now properly syncs in both directions:
- External controls (keyboard/buttons) → update viewer state via diff()
- Mouse interactions → update AppModel via ViewerStateChanged message

Closes: Zoom/pan via keyboard and buttons now functional
This commit is contained in:
mow 2026-01-15 18:10:57 +01:00
parent 2905a3f6f1
commit 69f22bafcd
5 changed files with 564 additions and 39 deletions
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src/app/view/mod.rs
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@ -6,6 +6,7 @@
mod canvas;
pub mod footer;
pub mod header;
mod image_viewer;
pub mod panels;
use cosmic::Element;