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Hosch250Hosch250
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Drag drop
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4 files changed

+278
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4 files changed

+278
-1
lines changed

‎RetailCoder.VBE/Rubberduck.csproj

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<DependentUpon>RemoveParametersView.xaml</DependentUpon>
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</Compile>
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<Compile Include="UI\Refactorings\RemoveParameters\RemoveParametersViewModel.cs" />
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<Compile Include="UI\Refactorings\ReorderParameters\DragAdorner.cs" />
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<Compile Include="UI\Refactorings\ReorderParameters\IndexIsNotLastConverter.cs" />
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<Compile Include="UI\Refactorings\ReorderParameters\IndexIsNotZeroConverter.cs" />
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<Compile Include="UI\Refactorings\ReorderParameters\ReorderParametersView.xaml.cs">

‎RetailCoder.VBE/UI/Refactorings/ReorderParameters/DragAdorner.cs

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using System.Windows;
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using System.Windows.Documents;
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using System.Windows.Media;
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using System.Windows.Shapes;
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namespace Rubberduck.UI.Refactorings.ReorderParameters
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{
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// borrowed from https://fxmax.wordpress.com/2010/10/05/wpf/
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public class DragAdorner : Adorner
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{
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private readonly Rectangle _child;
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private double _offsetLeft;
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private double _offsetTop;
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/// <summary>
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/// Initializes a new instance of DragVisualAdorner.
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/// </summary>
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/// <param name="adornedElement">The element being adorned.</param>
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/// <param name="size">The size of the adorner.</param>
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/// <param name="brush">A brush to with which to paint the adorner.</param>
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public DragAdorner(UIElement adornedElement, Size size, Brush brush)
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: base(adornedElement)
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{
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var rect = new Rectangle
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{
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Fill = brush,
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Width = size.Width,
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Height = size.Height,
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IsHitTestVisible = false
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};
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_child = rect;
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}
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public override GeneralTransform GetDesiredTransform(GeneralTransform transform)
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{
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var result = new GeneralTransformGroup();
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result.Children.Add(base.GetDesiredTransform(transform));
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result.Children.Add(new TranslateTransform(_offsetLeft, _offsetTop));
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return result;
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}
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/// <summary>
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/// Gets/sets the horizontal offset of the adorner.
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/// </summary>
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public double OffsetLeft
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{
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get { return _offsetLeft; }
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set
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{
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_offsetLeft = value;
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UpdateLocation();
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}
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}
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/// <summary>
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/// Updates the location of the adorner.
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/// </summary>
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/// <param name="left"></param>
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/// <param name="top"></param>
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public void SetOffsets(double left, double top)
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{
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_offsetLeft = left;
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_offsetTop = top;
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UpdateLocation();
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}
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/// <summary>
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/// Gets/sets the vertical offset of the adorner.
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/// </summary>
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public double OffsetTop
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{
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get { return _offsetTop; }
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set
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{
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_offsetTop = value;
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UpdateLocation();
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}
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}
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/// <summary>
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/// Override.
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/// </summary>
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/// <param name="constraint"></param>
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/// <returns></returns>
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protected override Size MeasureOverride(Size constraint)
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{
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_child.Measure(constraint);
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return _child.DesiredSize;
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}
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/// <summary>
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/// Override.
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/// </summary>
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/// <param name="finalSize"></param>
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/// <returns></returns>
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protected override Size ArrangeOverride(Size finalSize)
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{
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_child.Arrange(new Rect(finalSize));
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return finalSize;
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}
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/// <summary>
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/// Override.
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/// </summary>
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/// <param name="index"></param>
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/// <returns></returns>
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protected override Visual GetVisualChild(int index)
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{
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return _child;
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}
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/// <summary>
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/// Override. Always returns 1.
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/// </summary>
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protected override int VisualChildrenCount => 1;
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private void UpdateLocation()
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{
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var adornerLayer = Parent as AdornerLayer;
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adornerLayer?.Update(AdornedElement);
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}
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}
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}

‎RetailCoder.VBE/UI/Refactorings/ReorderParameters/ReorderParametersView.xaml

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ItemsSource="{Binding Parameters, UpdateSourceTrigger=PropertyChanged}"
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SelectedIndex="0"
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Name="ParameterGrid"
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AllowDrop="True"
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Drop="ParameterGrid_Drop"
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DragEnter="ParameterGrid_DragEnter"
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PreviewMouseMove="ParameterGrid_PreviewMouseMove"
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PreviewMouseLeftButtonDown="ParameterGrid_PreviewMouseLeftButtonDown"
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AlternationCount="2">
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<ListView.ItemTemplate>
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<DataTemplate>

‎RetailCoder.VBE/UI/Refactorings/ReorderParameters/ReorderParametersView.xaml.cs

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namespace Rubberduck.UI.Refactorings.ReorderParameters
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using System;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Documents;
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using System.Windows.Input;
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using System.Windows.Media;
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using Rubberduck.Refactorings.ReorderParameters;
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namespace Rubberduck.UI.Refactorings.ReorderParameters
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{
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public partial class ReorderParametersView
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{
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// borrowed the drag/drop from https://fxmax.wordpress.com/2010/10/05/wpf/
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private Point _startPoint;
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private DragAdorner _adorner;
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private AdornerLayer _layer;
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private ReorderParametersViewModel ViewModel => (ReorderParametersViewModel)DataContext;
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public ReorderParametersView()
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{
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InitializeComponent();
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}
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private void ParameterGrid_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
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{
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_startPoint = e.GetPosition(ParameterGrid);
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}
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private void ParameterGrid_PreviewMouseMove(object sender, MouseEventArgs e)
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{
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if (e.LeftButton == MouseButtonState.Pressed)
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{
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var position = e.GetPosition(null);
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if (Math.Abs(position.X - _startPoint.X) > SystemParameters.MinimumHorizontalDragDistance ||
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Math.Abs(position.Y - _startPoint.Y) > SystemParameters.MinimumVerticalDragDistance)
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{
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BeginDrag(e);
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}
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}
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}
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private void BeginDrag(MouseEventArgs e)
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{
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var listViewItem = FindAncestor<ListViewItem>((DependencyObject)e.OriginalSource);
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if (listViewItem == null) { return; }
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// get the data for the ListViewItem
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var parameter = (Parameter)ParameterGrid.ItemContainerGenerator.ItemFromContainer(listViewItem);
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//setup the drag adorner.
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InitialiseAdorner(listViewItem);
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//add handles to update the adorner.
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ParameterGrid.PreviewDragOver += ParameterGrid_DragOver;
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ParameterGrid.DragLeave += ParameterGrid_DragLeave;
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ParameterGrid.DragEnter += ParameterGrid_DragEnter;
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var data = new DataObject(typeof(Parameter), parameter);
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DragDrop.DoDragDrop(ParameterGrid, data, DragDropEffects.Move);
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//cleanup
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ParameterGrid.PreviewDragOver -= ParameterGrid_DragOver;
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ParameterGrid.DragLeave -= ParameterGrid_DragLeave;
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ParameterGrid.DragEnter -= ParameterGrid_DragEnter;
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if (_adorner != null)
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{
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AdornerLayer.GetAdornerLayer(ParameterGrid).Remove(_adorner);
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_adorner = null;
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}
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}
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private void ParameterGrid_DragEnter(object sender, DragEventArgs e)
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{
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if (!e.Data.GetDataPresent(typeof(Parameter)) ||
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sender == e.Source)
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{
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e.Effects = DragDropEffects.None;
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}
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}
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private void ParameterGrid_Drop(object sender, DragEventArgs e)
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{
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if (e.Data.GetDataPresent(typeof(Parameter)))
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{
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var parameter = e.Data.GetData(typeof(Parameter)) as Parameter;
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var listViewItem = FindAncestor<ListViewItem>((DependencyObject)e.OriginalSource);
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if (listViewItem != null)
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{
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var parameterToReplace = (Parameter)ParameterGrid.ItemContainerGenerator.ItemFromContainer(listViewItem);
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var index = ParameterGrid.Items.IndexOf(parameterToReplace);
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if (index >= 0)
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{
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ViewModel.Parameters.Move(ViewModel.Parameters.IndexOf(parameter), index);
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}
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}
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else
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{
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ViewModel.Parameters.Move(ViewModel.Parameters.IndexOf(parameter), ViewModel.Parameters.Count - 1);
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}
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}
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}
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private void InitialiseAdorner(ListViewItem listViewItem)
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{
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var brush = new VisualBrush(listViewItem);
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_adorner = new DragAdorner(listViewItem, listViewItem.RenderSize, brush) {Opacity = 0.5};
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_layer = AdornerLayer.GetAdornerLayer(ParameterGrid);
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_layer.Add(_adorner);
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}
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void ParameterGrid_DragLeave(object sender, DragEventArgs e)
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{
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if (e.OriginalSource == ParameterGrid)
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{
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var p = e.GetPosition(ParameterGrid);
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var r = VisualTreeHelper.GetContentBounds(ParameterGrid);
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if (!r.Contains(p))
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{
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e.Handled = true;
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}
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}
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}
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void ParameterGrid_DragOver(object sender, DragEventArgs args)
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{
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if (_adorner == null) { return; }
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_adorner.OffsetLeft = args.GetPosition(ParameterGrid).X;
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_adorner.OffsetTop = args.GetPosition(ParameterGrid).Y - _startPoint.Y;
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}
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// Helper to search up the VisualTree
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private static T FindAncestor<T>(DependencyObject current)
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where T : DependencyObject
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{
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do
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{
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if (current is T)
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{
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return (T)current;
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}
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current = VisualTreeHelper.GetParent(current);
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}
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while (current != null);
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return null;
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}
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}
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}

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