Feat/active cell wrapper #27
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* Add initial header drag preview implementation * Add drag column preview * Rename inner preview widgets * REname dropHeaderAtPosition * Add lines preview * Change mouse curson when hover a selected header * Reorder preview clean up * Fix preview using the latest selection * Render drag preview independet of selections * Fix selection tap initiating header drag * Set header index as a range * Add is header selected method to selection controller * Move action dispatch to methods * Fix preview with frozen panes * Set drop action to move the selection around * Add header cancel drag intent * Move dragging property to its own state class * Rename reorder preview to header drag and drop * Blocks a drop action within the header range * Add header drag state test * Move header drag and drop actions to its own files * Add intent docs * Add drag n drop preview theme * Add docs * Fix format * Add a configuration to swayze scope * Fix test * Fix const warning * Fix typos * Fix some selections no being dragged properly * Add a brief doc on why we use basic cursor for drag * Fix header drag and drop with frozen panes * Move drag state to its own class * Add end boundary drop test * Add header gesture detector tests * Fix dragging overlaping selections * Set a single action mock * Typo * Move drag and drop style to its own class * Fix comment
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Context
For rare situations, you may want to render a different background for the active selection and then paint over that with the selected cell content. This wrapper enables that.
I encountered this when trying to have SwayzeTable look like the original VisiCalc which I am preparing as a demo of this great open source engine.
Approach
Introduced a wrapper similar to the header, body and box wrappers. Needed to position the wrapper to simplify the widget tree without having to implement a customer painter.
Focused on activeRect (Active cell Rectangle) for this wrapper, could be expanded to support selectedRect (Selection Rectangle) but wanted to keep the scope small for a pull request/feature.