AutoSize colums for listview
It’s better when you have a ListView can have many columns can be autosized with this code it’s possible
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public class ListViewHelper { #region MinimumWidth (ATTACHED) [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1062:Valider les arguments de méthodes publiques", MessageId = "0")] public static double GetMinimumWidth(DependencyObject obj) { return (double)obj.GetValue(MinimumWidthProperty); } [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1062:Valider les arguments de méthodes publiques", MessageId = "0")] public static void SetMinimumWidth(DependencyObject obj, double value) { obj.SetValue(MinimumWidthProperty, value); } // Using a DependencyProperty as the backing store for MinimumWidth. This enables animation, styling, binding, etc... public static readonly DependencyProperty MinimumWidthProperty = DependencyProperty.RegisterAttached( "MinimumWidth", typeof(double), typeof(ListViewHelper), new PropertyMetadata(double.NaN) ); #endregion #region ExtendWidth (ATTACHED) [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1062:Valider les arguments de méthodes publiques", MessageId = "0")] public static bool GetExtendWidth(DependencyObject obj) { return (bool)obj.GetValue(ExtendWidthProperty); } [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1062:Valider les arguments de méthodes publiques", MessageId = "0")] public static void SetExtendWidth(DependencyObject obj, bool value) { obj.SetValue(ExtendWidthProperty, value); } // Using a DependencyProperty as the backing store for ExtendWidth. This enables animation, styling, binding, etc... public static readonly DependencyProperty ExtendWidthProperty = DependencyProperty.RegisterAttached( "ExtendWidth", typeof(bool), typeof(ListViewHelper), new PropertyMetadata(false) ); #endregion #region UpdateColumnWidthExtended (ATTACHED) public static bool GetUpdateColumnWidthExtended(DependencyObject obj) { return (bool)obj.GetValue(UpdateColumnWidthExtendedProperty); } public static void SetUpdateColumnWidthExtended(DependencyObject obj, bool value) { obj.SetValue(UpdateColumnWidthExtendedProperty, value); } public static readonly DependencyProperty UpdateColumnWidthExtendedProperty = DependencyProperty.RegisterAttached("UpdateColumnWidthExtended", typeof(bool), typeof(ListViewHelper), new FrameworkPropertyMetadata(false, (ss, ee) => { ListView lv = ss as ListView; lv.Loaded += (s, e) => { ScrollContentPresenter presenter = GetChildOfType<ScrollContentPresenter>(lv); GridViewHeaderRowPresenter rowPresenter = GetChildOfType<GridViewHeaderRowPresenter>(lv); //double decal = (presenter.ActualWidth - rowPresenter.ActualWidth) + rowPresenter.Margin.Left; double decal = (presenter.ActualWidth - Math.Min(presenter.ActualWidth, rowPresenter.ActualWidth)) + rowPresenter.Margin.Left; SizeChangedEventHandler sizeChanged = (notUsed, nullArgs) => { //if (cpt++ > 5) return; GridView gv = (lv.View as GridView); double availableSpace = presenter.ActualWidth - decal; double remainingSpace = availableSpace; int extendedWidthColumnCount = 0; foreach (var column in gv.Columns) { if (!GetExtendWidth(column)) { remainingSpace -= column.ActualWidth; } else { extendedWidthColumnCount++; } } double totalSize = 0; foreach (var column in gv.Columns) { if (GetExtendWidth(column)) { double minimumWidth = double.IsNaN(GetMinimumWidth(column)) ? 0.0 : GetMinimumWidth(column); double value = Math.Max(minimumWidth, remainingSpace / extendedWidthColumnCount); column.Width = value > 0 ? value : 0; } totalSize += column.Width; } #region disabled //Console.WriteLine("total = " + (totalSize + 20) + " availmable = " + availableSpace); //if (totalSize + 20 >= availableSpace) //{ // ScrollViewer.SetHorizontalScrollBarVisibility(lv, ScrollBarVisibility.Visible); //} //else //{ // ScrollViewer.SetHorizontalScrollBarVisibility(lv, ScrollBarVisibility.Hidden); //} #endregion }; if (presenter != null) { presenter.SizeChanged += sizeChanged; sizeChanged(presenter, null); } }; })); #endregion #region PRIVATE STATIC private static T GetChildOfType<T>(DependencyObject depObj) where T : DependencyObject { if (depObj == null) return null; for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++) { var child = VisualTreeHelper.GetChild(depObj, i); var result = (child as T) ?? GetChildOfType<T>(child); if (result != null) return result; } return null; } #endregion } |
and usage
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<ListView ItemsSource="{Binding Personnes}" SelectedItem="{Binding SelectedPersonne}" local:ListViewHelper.UpdateColumnWidthExtended="true" Grid.Row="1" Grid.Column="1"> <ListView.View> <GridView> <GridViewColumn Header="nom" DisplayMemberBinding="{Binding Nom}" local:ListViewHelper.ExtendWidth="true" local:ListViewHelper.MinimumWidth="100" /> <GridViewColumn Header="Prenom" DisplayMemberBinding="{Binding Prenom}" local:ListViewHelper.ExtendWidth="true" /> <GridViewColumn Header="Age" local:ListViewHelper.ExtendWidth="true" DisplayMemberBinding="{Binding Age}" /> </GridView> </ListView.View> </ListView> |
for information
- use local:ListViewHelper.UpdateColumnWidthExtended= »true » on ListView for define support resizing columns
- use local:ListViewHelper.ExtendWidth= »true » on each colums who is resized automaticly (like * on grid)
- use local:ListViewHelper.MinimumWidth= »100″ on colum when you want to have a minimum width
this is not tested with virtualized ListView (but when i nedded i make this)
see result :
and the same code with behaviror (for fun)
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class ListViewUpdateColBehavior : Behavior<ListView> { protected override void OnAttached() { base.OnAttached(); AssociatedObject.Loaded += (s, e) => { ScrollContentPresenter presenter = GetChildOfType<ScrollContentPresenter>(AssociatedObject); GridViewHeaderRowPresenter rowPresenter = GetChildOfType<GridViewHeaderRowPresenter>(AssociatedObject); double decal = (presenter.ActualWidth - rowPresenter.ActualWidth) + rowPresenter.Margin.Left; SizeChangedEventHandler sizeChanged = (notUsed, nullArgs) => { //if (cpt++ > 5) return; GridView gv = (AssociatedObject.View as GridView); double availableSpace = presenter.ActualWidth - decal; double remainingSpace = availableSpace; int extendedWidthColumnCount = 0; foreach (var column in gv.Columns) { if (!GetIsExtendWidth(column)) { remainingSpace -= column.ActualWidth; } else { extendedWidthColumnCount++; } } double totalSize = 0; foreach (var column in gv.Columns) { if (GetIsExtendWidth(column)) { double minimumWidth = double.IsNaN(GetMinimumWidth(column)) ? 0.0 : GetMinimumWidth(column); double value = Math.Max(minimumWidth, remainingSpace / extendedWidthColumnCount); column.Width = value > 0 ? value : 0; } totalSize += column.Width; } #region disabled //Console.WriteLine("total = " + (totalSize + 20) + " availmable = " + availableSpace); //if (totalSize + 20 >= availableSpace) //{ // ScrollViewer.SetHorizontalScrollBarVisibility(lv, ScrollBarVisibility.Visible); //} //else //{ // ScrollViewer.SetHorizontalScrollBarVisibility(lv, ScrollBarVisibility.Hidden); //} #endregion }; if (presenter != null) { presenter.SizeChanged += sizeChanged; sizeChanged(presenter, null); } }; } #region IsExtendWidth public static bool GetIsExtendWidth(DependencyObject obj) { return (bool)obj.GetValue(IsExtendWidthProperty); } public static void SetIsExtendWidth(DependencyObject obj, bool value) { obj.SetValue(IsExtendWidthProperty, value); } public static readonly DependencyProperty IsExtendWidthProperty = DependencyProperty.RegisterAttached("IsExtendWidth", typeof(bool), typeof(ListViewUpdateColBehavior), new PropertyMetadata(false )); #endregion #region MinimumWidth public static double GetMinimumWidth(DependencyObject obj) { return (double)obj.GetValue(MinimumWidthProperty); } public static void SetMinimumWidth(DependencyObject obj, double value) { obj.SetValue(MinimumWidthProperty, value); } public static readonly DependencyProperty MinimumWidthProperty = DependencyProperty.RegisterAttached("MinimumWidth", typeof(double), typeof(ListViewUpdateColBehavior), new PropertyMetadata(double.NaN )); #endregion #region PRIVATE STATIC private static T GetChildOfType<T>(DependencyObject depObj) where T : DependencyObject { if (depObj == null) return null; for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++) { var child = VisualTreeHelper.GetChild(depObj, i); var result = (child as T) ?? GetChildOfType<T>(child); if (result != null) return result; } return null; } #endregion } |
and use
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<ListView ItemsSource="{Binding Personnes}" SelectedItem="{Binding SelectedPersonne}" Grid.Row="3" Grid.Column="1"> <b:Interaction.Behaviors> <local:ListViewUpdateColBehavior /> </b:Interaction.Behaviors> <ListView.View> <GridView> <GridViewColumn Header="nom" local:ListViewUpdateColBehavior.IsExtendWidth="true" local:ListViewUpdateColBehavior.MinimumWidth="100" DisplayMemberBinding="{Binding Nom}" /> <GridViewColumn Header="Prenom" local:ListViewUpdateColBehavior.IsExtendWidth="true" DisplayMemberBinding="{Binding Prenom}" /> <GridViewColumn Header="Age" local:ListViewUpdateColBehavior.IsExtendWidth="true" DisplayMemberBinding="{Binding Age}" /> </GridView> </ListView.View> </ListView> |
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