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[minor] Add SwatchPalette, a selectable, drag-reorderable grid of colour swatches - #571
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…our swatches A wrapping grid of swatches over a caller-owned IList<Color>. Clicking a swatch selects it; dragging one reorders the list in place, with the selection following the swatch it named. Adding, removing and editing colours stays with the host. The layout, hit-testing, drop slot, move and drag tracking live in SwatchPaletteState with no ImGui dependency. The grid and each swatch are probe-marked. Adds a demo section, an isolation suite, a gallery tile and the image and colour docs entries. Closes #530 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LXUsRiHnKs6HCgLAbC1L6D
This was referenced Sep 30, 2026
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01HgjMCJ9MQRmUk6c8KABDYH
SonarCloud's S2184 flags int.MinValue / 2 and int.MaxValue / 2 passed where floats are expected, since an integer division feeding a float usually means a lost fraction. Nothing was lost here, but a named float bound says what the clamp is for: keeping the cast back to int from overflowing. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LXUsRiHnKs6HCgLAbC1L6D
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This was referenced Oct 1, 2026
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Requested by Matt · project thread
Before:
ktsu.ImGui.Widgetshad no palette widget. A host that wanted a pickable, reorderable set of colours had to lay out and hit-test swatches itself.After:
ImGuiWidgets.SwatchPalettedraws a wrapping grid of swatches over a caller-ownedIList<Color>. Clicking a swatch selects it. Dragging one reorders the list in place, and the selection follows the swatch it pointed at. Adding, removing and editing colours stay with the host.How:
SwatchPaletteStateholds the layout, hit-testing, drop slot, move and drag tracking, and has no ImGui dependency. The grid and each swatch are probe-marked. This adds a demo section, an isolation suite, a gallery tile, and entries in the image and colour docs group.Stacked PR. #570 (GradientEditor) has merged, so this now targets
mainand is the next one to merge. Merge order: this → ImageCompare (#572) → CropOverlay (#573) → PixelLoupe (#574).Validation, Release build: the solution builds clean,
ImGuiWidgetsDemo.UITestspasses 44/44,ImGui.Widgets.UITestspasses 900/900, andWidgetGallery --checkpasses.Closes #530
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