zng_ext_input::drag_drop

Struct DRAG_DROP

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pub struct DRAG_DROP;
Expand description

Drag & drop service.

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impl DRAG_DROP

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pub fn dragging_data(&self) -> ReadOnlyArcVar<Vec<DragDropData>>

All data current dragging.

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pub fn drag( &self, data: DragDropData, allowed_effects: DragDropEffect, ) -> DragHandle

Start dragging data.

This method will only work if a DRAG_START_EVENT is notifying. Handlers of draggable widgets can provide custom drag data using this method.

Returns a handle that can be dropped to cancel the drag operation. A DRAG_END_EVENT notifies the draggable widget on cancel or drop. Logs an error message and returns a dummy handle on error.

Note that the allowed_effects apply to all data, if a previous handler already set data with an incompatible effect the call is an error and the data ignored.

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