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;; (ql:quickload :qtools-ui) ;; (in-readtable :qtools) ;;; MIME data containing a Lisp data reference (defvar *mime-data-with-qobject-type* "application/qtools-mime-data-with-qobject") (define-widget mime-data-with-qobject (qmimedata) ((object :accessor object :initarg :object :initform nil))) ;;; Draggable (define-widget draggable (QWidget) ((mime-type :accessor mime-type :initarg :mime-type :initform nil))) (define-override (draggable mouse-press-event) (event) (when (eq (enum-value (q+:button event)) (q+:qt.left-button)) (let ((drag (q+:make-qdrag draggable)) (mime-data (make-instance 'mime-data-with-qobject :object draggable))) (setf (q+:data mime-data *mime-data-with-qobject-type*) "" (q+:mime-data drag) mime-data) (let ((drop-action (q+:exec drag))) drop-action))) (stop-overriding)) ;;; Drop target (define-widget drop-target (QWidget) ((callback :accessor callback :initarg :callback :initform (constantly nil)))) (define-initializer (drop-target initialize-drop-target) (setf (q+:accept-drops drop-target) t)) (define-override (drop-target drag-enter-event) (event) (when (q+:has-format (q+:mime-data event) *mime-data-with-qobject-type*) (q+:accept-proposed-action event))) (define-override (drop-target drop-event) (event) (let ((mime-data (q+:mime-data event))) (when (typep mime-data 'mime-data-with-qobject) (funcall callback drop-target (object mime-data))))) ;;; Test - drag from top half of window to bottom half of window (defun test () (flet ((callback (drop-target object) (declare (ignore drop-target object)) (print "DnD successful!"))) (with-main-window (layout 'qui:flow-layout) (qui:add-widget (make-instance 'draggable) layout) (qui:add-widget (make-instance 'drop-target :callback #'callback) layout))))