Improvements to make drag-and-drop easier #3882
Comments
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We should take a look at the Dear ImGui API for drag-and-drop |
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I want to mention egui_dnd just as a baseline to compare an egui-builtin solution against. It only seems to support fairly simple layouts. I would like something that supports drag and drop between different uis for maximum flexibility. An example use case of mine would be to drag tree nodes in a tree. For example move |
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@crumblingstatue I think a proper high-level drag-and-drop API in egui is still a little far off due to the difficulty to properly address the general case(s). This issue is more about the little things that would make lower-level implementation easier. As for the tree drag-and-drop, I just built a demo of that in the rerun repository: rerun-io/rerun#4879. I plan on making a proper egui example out of it. |
* Closes #3882 This adds several methods to make drag-and-drop more ergonomic in egui. In particular, egui can now keep track of _what_ is being dragged for you (the _payload_). Low-level: * `egui::DragAndDrop` hold the payload during a drag Mid-level: * `Response::dnd_set_drag_payload` sets it for drag-sources * `Response::dnd_hover_payload` and `Response::dnd_release_payload` reads it for drop-targets High-level: * `ui.dnd_drag_source`: make a widget draggable * `ui.dnd_drop_zone`: a container where things can be dropped The drag-and-drop demo is now a lot simpler: https://github.com/emilk/egui/blob/emilk/drag-and-drop/crates/egui_demo_lib/src/demo/drag_and_drop.rs --------- Co-authored-by: Antoine Beyeler <abeyeler@ab-ware.com>
* Closes emilk#3882 This adds several methods to make drag-and-drop more ergonomic in egui. In particular, egui can now keep track of _what_ is being dragged for you (the _payload_). Low-level: * `egui::DragAndDrop` hold the payload during a drag Mid-level: * `Response::dnd_set_drag_payload` sets it for drag-sources * `Response::dnd_hover_payload` and `Response::dnd_release_payload` reads it for drop-targets High-level: * `ui.dnd_drag_source`: make a widget draggable * `ui.dnd_drop_zone`: a container where things can be dropped The drag-and-drop demo is now a lot simpler: https://github.com/emilk/egui/blob/emilk/drag-and-drop/crates/egui_demo_lib/src/demo/drag_and_drop.rs --------- Co-authored-by: Antoine Beyeler <abeyeler@ab-ware.com>
ResponseandMemory#3876 addedmen.dragged_id(), but there is no way to get the value of to anegui::Id(which could then be converted to an internal Id).ctx().anything_being_decidedly_dragged()(equivalent toui.memory(|mem| mem.is_anything_being_dragged()) && ui.input(|i| i.pointer.is_decidedly_dragging())ctx().drag_stopped()The text was updated successfully, but these errors were encountered: