topic How to create a ListBox with dragable/movable (drag & drop) item? in Archicad C++ API

How to create a ListBox with dragable/movable (drag & drop) item?

ReignBough — Wed, 12 Jul 2023 12:22:21 GMT

I am creating a dialog with list box. The items should me dragable/movable to any row. I am using ListBoxObserver but I am unable to do it.

Re: How to create a ListBox with dragable/movable (drag & drop) item?

Oleg — Mon, 28 May 2018 12:10:40 GMT

There is 2 way

1. Full Drag-Drop

Call the EnableDragAndDropEvent() for panel (dialog)

Implement Drag-Drop handlers of the ListBoxObserver (ListBoxDragSourceObserver, ListBoxDropTargetObserver), at last
ListBoxDragStarting, ListBoxDragStarted, ListBoxDragEntered, ListBoxDragMoved, ListBoxDropped

2. Simple row dragging

Create an "drag" icon column. Fill it the DG::ListBox::DragIcon or any other.

Call list.EnableMouseMoveEvent() for the list box

Implement ListBoxMouseMoved( const DG::ListBoxMouseMoveEvent& ev, short* inArea );
When a mouse will be over the drag icon column, assign *inArea = DG::ListBox::DragArea.

Implement ListBoxItemDragged( const DG::ListBoxDragEvent& ev ) to handle dragging

Re: How to create a ListBox with dragable/movable (drag & drop) item?

ReignBough — Tue, 29 May 2018 03:21:00 GMT

Thank you.

The error in my code was in ListBoxMouseMoved() function since I follow the documentation:

virtual void ListBoxMouseMoved (
    const ListBoxMouseMoveEvent & ev,
    bool *              inDragArea
);

It is now working after I changed it to short.