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labwc/docs/scroll-cycle.md
iamcheyan 856da84f08 cursor: add scroll wheel support for window cycle 
When cycle mode is active (Alt+Tab held), scrolling the mouse wheel
cycles through windows. Scroll down advances to the next window,
scroll up goes to the previous window.

This uses the same LAB_CYCLE_DIR_FORWARD/BACKWARD constants as the
keyboard handler, ensuring consistent navigation behavior.

No configuration needed - always active during cycle mode.
2026-06-13 08:25:22 +09:00

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Scroll Wheel Support for Window Cycle (Alt+Tab)

Summary

Add mouse scroll wheel support to the Alt+Tab window switcher. When cycle mode is active (Alt+Tab held), scrolling the mouse wheel cycles through windows — scroll down for next, scroll up for previous.

Usage

  1. Press and hold Alt+Tab to enter cycle mode
  2. Scroll wheel down → cycle to the next window
  3. Scroll wheel up → cycle to the previous window
  4. Release Alt to focus the selected window

No configuration needed — this behavior is always active during cycle mode.

Technical Details

The patch intercepts WL_POINTER_AXIS_VERTICAL_SCROLL events in handle_axis() when server.input_mode == LAB_INPUT_STATE_CYCLE. It maps:

  • Negative delta (scroll up) → LAB_CYCLE_DIR_BACKWARD
  • Positive delta (scroll down) → LAB_CYCLE_DIR_FORWARD

These are the same direction constants used by the keyboard handler (handle_cycle_view_key() in keyboard.c), ensuring consistent behavior between keyboard and mouse navigation.

The event is consumed (not forwarded to clients or processed as mouse bindings) when cycle mode is active.

Files Changed

  • src/input/cursor.c — Added scroll wheel interception in handle_axis()