[Débutant] WPF/Avalonia : Selection par lasso

Bonjour à tous,

Je débute sur avalonia et wpf et je rencontre un problème avec le listbox. En effet, la sélection par lasso n'est pas implémentée de base sur le contrôle. Je m'attache donc à la tache pour la créer. J'ai essayé avec un adornerlayer mais le canvas utilisé pour le dessin masque les items. Je suis donc partis sur un behavior afin d'étendre le control listbox. Ca marche comme plus ou moins comme je veux. Le problème vient que le début de la zone de selection ne suit pas le scroll de la listbox et donc perd les items selectionnés lors du scroll.

Comment puis je faire un behavior qui dessine bien sur le canvas et garde la position initiale pour avoir une sélection complète même après avoir scrollé? En gros il faudrait que le canvas scroll comme la listbox et mette à jour le point de départ.

Ou alors je me plante complètement dans l'approche et il faut faire autrement. La question est donc comment?

Merci pour l'aide et les éclaircissements.

Le code xaml :

Code:

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        <!-- DIRECTORY CONTENT -->
        <Grid Grid.Row="2">
 
            <Canvas x:Name="SelectionCanvas" Grid.Row="2"
                IsHitTestVisible="False"
                Margin="5" Panel.ZIndex="10"
                Width="{Binding Width, ElementName=listBox}"
                Height="{Binding Height, ElementName=listBox}"/>
 
            <ListBox x:Name="listBox"
                ItemsSource="{Binding FiltredContent}"
                SelectionMode="Multiple"
                SelectedItems="{Binding SelectedItems}"
                HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
                Margin="5" >
 
                <interactivity:Interaction.Behaviors>
                    <behaviors:TestBehavior/>
                </interactivity:Interaction.Behaviors>
 
                <ItemsControl.Styles>
                    <Style Selector="ContentPresenter"  x:DataType="vm:DirContentItemViewModel">
                        <Setter Property="Margin" Value="10"/>
                    </Style>
                </ItemsControl.Styles>
 
                <ListBox.ItemsPanel >
                    <ItemsPanelTemplate >
                        <WrapPanel Orientation="Horizontal" />
                        <!-- https://stackoverflow.com/questions/4656717/how-to-set-margin-for-inner-controls-of-wrappanel -->
                    </ItemsPanelTemplate>
                </ListBox.ItemsPanel>
 
            </ListBox>
 
            <TextBlock Text="Pas de fichier à afficher"
                IsVisible="{Binding EmptyContent}"
                Foreground="Red"
                HorizontalAlignment="Center" VerticalAlignment="Center"
                FontSize="15"/>
 
        </Grid>
        <!-- END DIRECTORY CONTENT -->

Et le code du behavior :

Code:

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public class TestBehavior : Behavior<ListBox>
    {
        enum SelectionMode
        {
            None,
            New,
            Add,
            Multi
        }
 
        ListBox? listBox;
        Canvas? _canvas;
        readonly Border _selectionRectangle = new()
        {
            BorderBrush = Brushes.Blue,
            BorderThickness = new Thickness(1),
            Background = new SolidColorBrush(Colors.LightBlue, 0.3),
            IsHitTestVisible = false,
            IsVisible = false
        };
        SelectionMode _mode = SelectionMode.None;
        bool _isSelecting;
        Point _startPoint;
        HashSet<object> _initialSelection = new();
        HashSet<object> newSelection = new();
 
        protected override void OnAttached()
        {
            base.OnAttached();
            if (AssociatedObject is not ListBox) throw new ArgumentException("AssociatedObject is null or is not Type of Listbox");
            listBox = AssociatedObject;
            listBox.PointerPressed += OnPointerPressedEvent;
            listBox.PointerMoved += OnPointerMoved;
            listBox.PointerReleased += OnPointerReleased;
 
            var scrollViewer = listBox.FindAncestorOfType<ScrollViewer>();
            if (scrollViewer != null)
            {
                scrollViewer.ScrollChanged += OnScrollChanged;
            }
 
            Grid? ct = listBox.Parent as Grid ?? throw new ArgumentException("AssociatedObject is not in a Grid");
            _canvas = ct.Children[0] as Canvas ?? throw new ArgumentException("AssociatedObject has not a canvas");
            _canvas.Children.Add(_selectionRectangle);
        }
 
        protected override void OnDetaching()
        {
            if (_canvas is not null) _canvas = null;
            if (listBox is not null)
            {
                var scrollViewer = listBox.FindAncestorOfType<ScrollViewer>();
                if (scrollViewer != null)
                {
                    scrollViewer.ScrollChanged -= OnScrollChanged;
                }
 
                listBox.PointerPressed -= OnPointerPressedEvent;
                listBox.PointerMoved -= OnPointerMoved;
                listBox.PointerReleased -= OnPointerReleased;
            }
            base.OnDetaching();
        }
 
        void OnScrollChanged(object? sender, ScrollChangedEventArgs e)
        {
            if (_canvas is null || listBox is null) return;
 
            var scrollViewer = sender as ScrollViewer;
            if (scrollViewer is null) return;
 
            var offsetY = scrollViewer.Offset.Y;
 
            // Mise à jour de la position du rectangle de sélection
            var currentTop = Canvas.GetTop(_selectionRectangle);
            Canvas.SetTop(_selectionRectangle, _startPoint.Y - offsetY);
        }
 
        void OnPointerPressedEvent(object? sender, PointerPressedEventArgs e)
        {
            if (!e.GetCurrentPoint(listBox).Properties.IsLeftButtonPressed) return;
            if (listBox is null || _canvas is null) return;
            SetMode(e.KeyModifiers);
            _startPoint = e.GetPosition(_canvas);
            _selectionRectangle.Width = 0;
            _selectionRectangle.Height = 0;
            Canvas.SetLeft(_selectionRectangle, _startPoint.X);
            Canvas.SetTop(_selectionRectangle, _startPoint.Y);
        }
 
        void OnPointerMoved(object? sender, PointerEventArgs e)
        {
            if (!_isSelecting || listBox is null || _canvas is null) return;
            if (!e.GetCurrentPoint(listBox).Properties.IsLeftButtonPressed) return;
            var pointerPosition = e.GetPosition(listBox);
            _selectionRectangle.IsVisible = true;
            var endPoint = e.GetPosition(_canvas);
            double x = Math.Min(_startPoint.X, endPoint.X);
            double y = Math.Min(_startPoint.Y, endPoint.Y);
            double width = Math.Abs(endPoint.X - _startPoint.X);
            double height = Math.Abs(endPoint.Y - _startPoint.Y);
            Canvas.SetLeft(_selectionRectangle, x);
            Canvas.SetTop(_selectionRectangle, y);
            _selectionRectangle.Width = width;
            _selectionRectangle.Height = height;
            SelectItems(listBox, new Rect(x, y, width, height));
        }
 
        void OnPointerReleased(object? sender, PointerReleasedEventArgs e)
        {
            _isSelecting = false;
            _selectionRectangle.IsVisible = false;
            _initialSelection.Clear();
            newSelection.Clear();
        }
 
        void SetMode(KeyModifiers key)
        {
            _isSelecting = true;
            if (key.HasFlag(KeyModifiers.Control))
            {
                _mode = SelectionMode.Multi;
            }
            else if (key.HasFlag(KeyModifiers.Shift))
            {
                _mode = SelectionMode.Add;
            }
            else
            {
                _mode = SelectionMode.New;
                listBox?.SelectedItems?.Clear();
            }
        }
 
        private void SelectItems(ListBox listBox, Rect selectionBounds)
        {
            if (listBox is null || _canvas is null) return;
 
            var scrollViewer = listBox.FindAncestorOfType<ScrollViewer>();
            var scrollOffset = scrollViewer?.Offset.Y ?? 0;
 
            foreach (var item in listBox.Items)
            {
                var container = listBox.ContainerFromItem(item) as Control;
                if (container == null) continue;
 
                var itemBounds = new Rect(container.TranslatePoint(new Point(0, 0), _canvas) ?? new Point(), container.Bounds.Size);
                itemBounds = new Rect(itemBounds.X, itemBounds.Y - scrollOffset, itemBounds.Width, itemBounds.Height);
 
                bool isInside = selectionBounds.Intersects(itemBounds);
                switch (_mode)
                {
                    case SelectionMode.New:
                        if (isInside)
                        {
                            if (!listBox.SelectedItems.Contains(item))
                            {
                                listBox.SelectedItems.Add(item);
                            }
                        }
                        else
                        {
                            if (listBox.SelectedItems.Contains(item))
                            {
                                listBox.SelectedItems.Remove(item);
                            }
                        }
                        break;
                    case SelectionMode.Add:
                        if (isInside && !listBox.SelectedItems.Contains(item))
                        {
                            listBox.SelectedItems.Add(item);
                        }
                        break;
                    case SelectionMode.Multi:
                        if (isInside)
                        {
                            if (listBox.SelectedItems.Contains(item))
                            {
                                listBox.SelectedItems.Remove(item);
                            }
                            else
                            {
                                listBox.SelectedItems.Add(item);
                            }
                        }
                        break;
                }
            }
        }
    }

Bon je me répond à moi-même et pour ceux qui passeraient.

Le code initial gérait mal le scroll car il se faisait sur la listbox qui avait une hauteur supérieure à e qui etait visible. J'ai donc adapté le code pour que le scroll se fasse sur le scrollviewer dont ont connais la hauteur visuel. Cette solution permet de savoir si on est près du bord.

Voici le code corrigé et à finaliser :

Code:

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 <!-- DIRECTORY CONTENT -->
 <ScrollViewer x:Name="SelecScroll" Grid.Row="2" 
     VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
     <Grid >
 
         <Canvas x:Name="SelectionCanvas"
             IsHitTestVisible="False"
             Margin="5" Panel.ZIndex="10"
             Width="{Binding Width, ElementName=listBox}"
             Height="{Binding Height, ElementName=listBox}"/>
 
         <!-- control independant à faire en fonction de l'affichage type -->
         <ListBox x:Name="listBox"
             ItemsSource="{Binding FiltredContent}"
             SelectionMode="Multiple"
             SelectedItems="{Binding SelectedItems}"
             HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
             Margin="5" >
 
             <interactivity:Interaction.Behaviors>
                 <behaviors:LassoSelectionListBoxBehavior  SelectionBorderColor="Red"/>
             </interactivity:Interaction.Behaviors>
 
             <ItemsControl.Styles>
                 <Style Selector="ContentPresenter"  x:DataType="vm:DirContentItemViewModel">
                     <Setter Property="Margin" Value="10"/>
                     <Setter Property="Width" Value="128" />
                 </Style>
             </ItemsControl.Styles>
 
             <ListBox.ItemsPanel >
                 <ItemsPanelTemplate >
                     <WrapPanel Orientation="Horizontal" />
                 </ItemsPanelTemplate>
             </ListBox.ItemsPanel>
 
         </ListBox>
 
         <TextBlock Text="Pas de fichier à afficher"
             IsVisible="{Binding EmptyContent}"
             Foreground="Red"
             HorizontalAlignment="Center" VerticalAlignment="Center"
             FontSize="15"/>
 
     </Grid>
 </ScrollViewer>
 <!-- END DIRECTORY CONTENT -->

et le code du behavior

Code:

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using System;
using System.Collections.Generic;
 
using Avalonia;
using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Media;
using Avalonia.Xaml.Interactivity;
 
using EBooKLab.Models.Core;
 
 
namespace EBooKLab.Behaviors;
 
public class LassoSelectionListBoxBehavior : Behavior<ListBox>
{
 
    #region Members
 
    ListBox? _lbx;
    ScrollViewer? _scrollViewer;
    Canvas? _canvas;
 
    Border _selectionRectangle = new()
    {
        BorderBrush = Brushes.Blue,
        BorderThickness = new Thickness(1),
        Background = new SolidColorBrush(Colors.LightBlue, 0.3),
        IsHitTestVisible = false,
        IsVisible = false
    };
 
    SelectionType _mode = SelectionType.None;
    bool _isSelecting;
    Point _startPoint;
    readonly HashSet<object> _initialSelection = [];
    readonly HashSet<object> _newSelection = [];
 
    #endregion
 
    #region Properties
 
 
    public static readonly StyledProperty<IBrush> SelectionBorderColorProperty =
        AvaloniaProperty.Register<LassoSelectionListBoxBehavior, IBrush>(nameof(SelectionBorderColor), defaultValue: Brushes.Blue);
    public static readonly StyledProperty<double> SelectionBorderThicknessProperty =
        AvaloniaProperty.Register<LassoSelectionListBoxBehavior, double>(nameof(SelectionBorderThickness), defaultValue: 1);
 
    public static readonly StyledProperty<double> SelectionTransparancyProperty =
        AvaloniaProperty.Register<LassoSelectionListBoxBehavior, double>(nameof(SelectionTransparancy), defaultValue: 0.3);
 
    public static readonly StyledProperty<IBrush> SelectionBackgroundProperty =
        AvaloniaProperty.Register<LassoSelectionListBoxBehavior, IBrush>(nameof(SelectionBackground), defaultValue: Brushes.LightBlue);
 
 
    public IBrush SelectionBorderColor
    {
        get => GetValue(SelectionBorderColorProperty);
        set => SetValue(SelectionBorderColorProperty, value);
    }
 
    public double SelectionBorderThickness
    {
        get => GetValue(SelectionBorderThicknessProperty);
        set => SetValue(SelectionBorderThicknessProperty, value);
    }
 
    public double SelectionTransparancy
    {
        get => GetValue(SelectionTransparancyProperty);
        set => SetValue(SelectionTransparancyProperty, value);
    }
 
    public IBrush SelectionBackground
    {
        get => GetValue(SelectionBackgroundProperty);
        set => SetValue(SelectionBackgroundProperty, value);
    }
 
    #endregion
 
    #region Attaching 
 
    protected override void OnAttached()
    {
        base.OnAttached();
 
        if (AssociatedObject is not ListBox lbx) throw new ArgumentException("AssociatedObject is null or is not Type of Listbox");
        Grid? ct = lbx.Parent as Grid ?? throw new ArgumentException("AssociatedObject is not in a Grid");
        _scrollViewer = ct.Parent as ScrollViewer ?? throw new ArgumentException("AssociatedObject parent is not in a ScrollViewer");
        _canvas = ct.Children[0] as Canvas ?? throw new ArgumentException("AssociatedObject has no a canvas");
 
        //FIXME: Set to pressed
        _canvas.Children.Add(_selectionRectangle);
 
        _lbx = lbx;
        _lbx.PointerPressed += OnPointerPressedEvent;
        _lbx.PointerMoved += OnPointerMoved;
        _lbx.PointerReleased += OnPointerReleased;
    }
 
    protected override void OnDetaching()
    {
        if (_canvas is not null)
            _canvas = null;
 
        if (_lbx is not null)
        {
            _lbx.PointerPressed -= OnPointerPressedEvent;
            _lbx.PointerMoved -= OnPointerMoved;
            _lbx.PointerReleased -= OnPointerReleased;
 
            _lbx = null;
        }
 
        base.OnDetaching();
    }
 
    #endregion
 
 
    #region Mouse
 
    void OnPointerPressedEvent(object? sender, PointerPressedEventArgs e)
    {
        if (!e.GetCurrentPoint(_lbx).Properties.IsLeftButtonPressed ||
            _lbx is null || _canvas is null || _lbx.Items.Count == 0)
            return;
 
        SetMode(e.KeyModifiers);
        CreateSelectionShape();
 
        _startPoint = e.GetPosition(_lbx);
        _selectionRectangle.Width = 0;
        _selectionRectangle.Height = 0;
        Canvas.SetLeft(_selectionRectangle, _startPoint.X);
        Canvas.SetTop(_selectionRectangle, _startPoint.Y);
    }
 
    void SetMode(KeyModifiers key)
    {
        if (_lbx == null || _lbx.Items?.Count == 0)
            return;
 
        _isSelecting = true;
 
        if (key.HasFlag(KeyModifiers.Control))
            _mode = SelectionType.Toggle;
        else if (key.HasFlag(KeyModifiers.Shift))
            _mode = SelectionType.Add;
        else
        {
            _mode = SelectionType.New;
            _lbx.SelectedItems?.Clear();
        }
    }
 
 
 
 
 
 
    void CreateSelectionShape()
    {
        //FIXME :  
        /*_selectionRectangle = new()
        {
            BorderBrush = SelectionBorderColor,
            BorderThickness = new Thickness(SelectionBorderThickness),
            Background = new SolidColorBrush(SelectionBackground, SelectionTransparancy),
            IsHitTestVisible = false,
            IsVisible = false
        };
        
        // FIXME : _canvas.Children.Add(_selectionRectangle); => actuellement pas de renouvellement de la bordure donc ne peut ajouter 2 fois au canvas...*/
        _selectionRectangle.IsVisible = true; // Affichez le rectangle de sélection
    }
 
 
 
 
 
    void OnPointerMoved(object? sender, PointerEventArgs e)
    {
        if (!e.GetCurrentPoint(_lbx).Properties.IsLeftButtonPressed ||
            !_isSelecting || _lbx is null || _canvas is null || _scrollViewer is null)
            return;
 
        SetSelectionRectangle(e.GetPosition(_canvas));
        ScrollIfNeeded(e.GetPosition(_scrollViewer));
 
        SelectItems();
    }
 
    void SetSelectionRectangle(Point endPoint)
    {
        double x = Math.Min(_startPoint.X, endPoint.X);
        double y = Math.Min(_startPoint.Y, endPoint.Y);
        double width = Math.Abs(endPoint.X - _startPoint.X);
        double height = Math.Abs(endPoint.Y - _startPoint.Y);
        Canvas.SetLeft(_selectionRectangle, x);
        Canvas.SetTop(_selectionRectangle, y);
        _selectionRectangle.Width = width;
        _selectionRectangle.Height = height;
    }
 
    void ScrollIfNeeded(Point listBoxPoint)
    {
        if (_scrollViewer is null)
            return;
 
        // Marges pour activer le défilement automatique
        double scrollMargin = 20;
        double scrollSpeed = 20;
 
        // Obtenez la taille de la fenêtre de défilement
        var scrollHeight = _scrollViewer.Bounds.Height;
        var scrollWidth = _scrollViewer.Bounds.Width;
 
        if (listBoxPoint.X < scrollMargin) // Vérifiez si le curseur est proche du bord gauche
            _scrollViewer.Offset = new Vector(_scrollViewer.Offset.X - scrollSpeed, _scrollViewer.Offset.Y);
 
        else if (listBoxPoint.X > scrollHeight - scrollMargin) // Vérifiez si le curseur est proche du bord droit
            _scrollViewer.Offset = new Vector(_scrollViewer.Offset.X + scrollSpeed, _scrollViewer.Offset.Y);
 
        if (listBoxPoint.Y < scrollMargin) // Vérifiez si le curseur est proche du bord supérieur
            _scrollViewer.Offset = new Vector(_scrollViewer.Offset.X, _scrollViewer.Offset.Y - scrollSpeed);
 
        else if (listBoxPoint.Y > scrollHeight - scrollMargin) // Vérifiez si le curseur est proche du bord inférieur
            _scrollViewer.Offset = new Vector(_scrollViewer.Offset.X, _scrollViewer.Offset.Y + scrollSpeed);
 
    }
 
    #endregion
 
 
    void SelectItems()
    {
        if (_lbx is null || _lbx.Items?.Count == 0 || _canvas is null || _scrollViewer is null ||
            _selectionRectangle is null || _selectionRectangle?.Height == 0 || _selectionRectangle?.Width == 0 )
            return;
 
        double scrollOffset = _scrollViewer?.Offset.Y ?? 0;
        Rect itemBounds = new();
 
        foreach (var item in _lbx.Items!)
        {
            if (_lbx.ContainerFromItem(item!) is not Control container)
                continue;
 
            itemBounds = new Rect(container.TranslatePoint(new Point(0, 0), _canvas) ?? new Point(), container.Bounds.Size);
            itemBounds = new Rect(itemBounds.X, itemBounds.Y - scrollOffset, itemBounds.Width, itemBounds.Height);
 
            SetSelecItem(item, _selectionRectangle!.Bounds.Intersects(itemBounds));
        }
 
    }
 
    void SetSelecItem(object? item, bool isInside)
    {
        switch(_mode)
        {
            case SelectionType.New:
                if (isInside)
                {
                    if (!_lbx!.SelectedItems!.Contains(item))
                        _lbx.SelectedItems.Add(item);
                }
                else
                {
                    if (_lbx!.SelectedItems!.Contains(item))
                        _lbx.SelectedItems.Remove(item);
                }
                break;
            case SelectionType.Add:
                if (isInside && !_lbx!.SelectedItems!.Contains(item))
                    _lbx.SelectedItems.Add(item);
                break;
            case SelectionType.Toggle:
                //FIXME : Fait scintillé l'affichage en inversant à chaque mouvement
                /*                    if (isInside)
                    {
                        if (_lbx.SelectedItems!.Contains(item))
                            _lbx.SelectedItems.Remove(item);
                        else
                            _lbx.SelectedItems.Add(item);
                    }*/
                if (isInside)
                {
                    if (_newSelection.Contains(item))
                    {
                        if (_lbx!.SelectedItems!.Contains(item))
                            _lbx.SelectedItems.Remove(item);
                        _newSelection.Remove(item);
                    }
                    else
                    {
                        if (!_lbx!.SelectedItems!.Contains(item))
                            _lbx.SelectedItems.Add(item);
                        _newSelection.Add(item);
                    }
                }
                    break;
        }
 
    }
 
    void OnPointerReleased(object? sender, PointerReleasedEventArgs e)
    {
        _isSelecting = false;
        //FIXME : _canvas?.Children.Clear();
        //_selectionRectangle = null;
        _initialSelection.Clear();
        _newSelection.Clear();
    }
 
}