Reworked Drag Behavior to be default on shift#25
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carl-andersson-at-westermo
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AndersPantzarWestermo and
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AndersPantzarWestermo
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Jun 12, 2026
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Pull request overview
This PR updates the Avalonia drag/snapping behavior so snapping is driven by a Shift-based default predicate and refactors the ShowcaseApp DynamicGraph example to configure snapping per-vertex instead of via global behavior.
Changes:
- Introduces new snapping helpers (
GridSnap,WidthSnap,HeightSnap) and a Shift-basedDefaultSnapPredicate. - Tracks key modifiers during drag (
CurrentPointerKeyModifiers) and adds/removes a"ChildDragging"class on the drag container. - Updates the Avalonia DynamicGraph showcase to apply snapping predicates/modifiers when creating new vertices.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 11 comments.
| File | Description |
|---|---|
| Westermo.GraphX.Controls.Avalonia/Behaviours/DragBehaviour.cs | Refactors snapping defaults/helpers and drag state handling (Shift-based default snapping, key-modifier tracking, simplified Snap()). |
| Examples/ShowcaseApp.Avalonia/Pages/DynamicGraph.axaml.cs | Removes global snapping setup and applies snapping configuration to newly created vertices in the demo. |
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
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