Exemplo n.º 1
0
        private static void OnDataObjectChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var attached = DragDropManager.GetIsDragSourceAttached(d);

            if (!attached)
            {
                DragDropManager.SetIsDragSourceAttached(d, true);

                (( UIElement )d).PreviewMouseLeftButtonDown += (s, args) =>
                {
                    var _startPoint = args.GetPosition(null);
                    DragDropManager.SetStartPoint(d, _startPoint);
                };

                /*
                 * We cannot use "MouseLeftButtonDown" because on the
                 * TreeView control is never fired, maybe is handled by
                 * someone else in the processing pipeline.
                 */
                //( ( UIElement )d ).MouseLeftButtonDown += ( s, args ) =>
                //{
                //    var _startPoint = args.GetPosition( null );
                //    DragDropManager.SetStartPoint( d, _startPoint );
                //};

                (( UIElement )d).MouseMove += (s, args) =>
                {
                    var isDragging = DragDropManager.GetIsDragging(d);
                    if (args.LeftButton == MouseButtonState.Pressed && !isDragging)
                    {
                        var position    = args.GetPosition(null);
                        var _startPoint = DragDropManager.GetStartPoint(d);

                        if (Math.Abs(position.X - _startPoint.X) > SystemParameters.MinimumHorizontalDragDistance ||
                            Math.Abs(position.Y - _startPoint.Y) > SystemParameters.MinimumVerticalDragDistance)
                        {
                            StartDrag(d, args);
                        }
                    }
                };
            }
        }
Exemplo n.º 2
0
        static void StartDrag(DependencyObject d, MouseEventArgs e)
        {
            var sourceItem = DragDropManager.FindDragContainer(( DependencyObject )e.OriginalSource);

            DragDropManager.SetIsDragging(d, true);

            var obj     = DragDropManager.GetDataObject(sourceItem);
            var objType = DragDropManager.GetDataObjectType(sourceItem);

            DataObject data = null;

            if (String.IsNullOrEmpty(objType))
            {
                data = new DataObject(obj.GetType(), obj);
            }
            else
            {
                data = new DataObject(objType, obj);
            }

            var de = DragDrop.DoDragDrop(d, data, DragDropEffects.Move);

            DragDropManager.SetIsDragging(d, false);
        }
Exemplo n.º 3
0
        private static void OnOnDropCommandChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var attached = DragDropManager.GetIsDropTargetAttached(d);

            if (!attached)
            {
                DragDropManager.SetIsDropTargetAttached(d, true);

                var ui = ( UIElement )d;

                ui.AllowDrop = true;
                var ctrl = ui as Control;
                if (ctrl != null)
                {
                    var bkg = ctrl.GetValue(ItemsControl.BackgroundProperty);
                    if (bkg == null)
                    {
                        ctrl.SetValue(ItemsControl.BackgroundProperty, Brushes.Transparent);
                    }
                }

                ui.DragEnter += (s, args) =>
                {
                    var os      = ( DependencyObject )args.OriginalSource;
                    var command = DragDropManager.FindDragEnterCommand(os);
                    if (command != null)
                    {
                        var dropTarget = DragDropManager.FindDropTarget(os);
                        var cmdArgs    = new DragEnterArgs(
                            args.Data,
                            args.KeyStates,
                            dropTarget,
                            args.AllowedEffects);

                        if (command.CanExecute(cmdArgs))
                        {
                            command.Execute(cmdArgs);
                        }
                    }
                };

                ui.DragLeave += (s, args) =>
                {
                    var os      = ( DependencyObject )args.OriginalSource;
                    var command = DragDropManager.FindDragLeaveCommand(os);
                    if (command != null)
                    {
                        var dropTarget = DragDropManager.FindDropTarget(os);
                        var cmdArgs    = new DragLeaveArgs(
                            args.Data,
                            args.KeyStates,
                            dropTarget,
                            args.AllowedEffects);

                        if (command.CanExecute(cmdArgs))
                        {
                            command.Execute(cmdArgs);
                        }
                    }
                };

                ui.DragOver += (s, args) =>
                {
                    var os = ( DependencyObject )args.OriginalSource;

                    var command = DragDropManager.FindDropCommand(os);
                    if (command != null)
                    {
                        var dropTarget = DragDropManager.FindDropTarget(os);

                        Point position = new Point(0, 0);
                        if (os is IInputElement)
                        {
                            position = args.GetPosition(( IInputElement )os);
                        }

                        var cmdArgs = new DragOverArgs(
                            args.Data,
                            args.KeyStates,
                            dropTarget,
                            args.AllowedEffects,
                            position);

                        var result = command.CanExecute(cmdArgs);
                        if (!result)
                        {
                            args.Effects = cmdArgs.Effects;
                            args.Handled = true;
                        }
                    }
                    else
                    {
                        args.Effects = args.AllowedEffects;
                        args.Handled = true;
                    }
                };

                ui.Drop += (s, args) =>
                {
                    var os = ( DependencyObject )args.OriginalSource;

                    var command = DragDropManager.FindDropCommand(os);
                    if (command != null)
                    {
                        var dropTarget = DragDropManager.FindDropTarget(os);

                        Point position = new Point(0, 0);
                        if (os is IInputElement)
                        {
                            position = args.GetPosition(( IInputElement )os);
                        }

                        var cmdArgs = new DropArgs(args.Data, args.KeyStates, dropTarget, position);
                        command.Execute(cmdArgs);
                    }
                };
            }
        }