29 votes

Animation WPF : liaison avec l'attribut "To" de l'animation du storyboard

J'essaie de créer un bouton qui se comporte de la même manière que le bouton "glisser" de l'iPhone. J'ai une animation qui ajuste la position et la largeur du bouton, mais je veux que ces valeurs soient basées sur le texte utilisé dans le contrôle. Actuellement, elles sont codées en dur.

Voici mon XAML de travail, jusqu'à présent :

<CheckBox x:Class="Smt.Controls.SlideCheckBox"
          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
          xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
          xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
          xmlns:local="clr-namespace:Smt.Controls"
          xmlns:System.Windows="clr-namespace:System.Windows;assembly=PresentationCore"
          Name="SliderCheckBox"
          mc:Ignorable="d">
    <CheckBox.Resources>
        <System.Windows:Duration x:Key="AnimationTime">0:0:0.2</System.Windows:Duration>
        <Storyboard x:Key="OnChecking">
            <DoubleAnimation Storyboard.TargetName="CheckButton"
                             Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(TranslateTransform.X)"
                             Duration="{StaticResource AnimationTime}"
                             To="40" />
            <DoubleAnimation Storyboard.TargetName="CheckButton"
                             Storyboard.TargetProperty="(Button.Width)"
                             Duration="{StaticResource AnimationTime}"
                             To="41" />
        </Storyboard>
        <Storyboard x:Key="OnUnchecking">
            <DoubleAnimation Storyboard.TargetName="CheckButton"
                             Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(TranslateTransform.X)"
                             Duration="{StaticResource AnimationTime}"
                             To="0" />
            <DoubleAnimation Storyboard.TargetName="CheckButton"
                             Storyboard.TargetProperty="(Button.Width)"
                             Duration="{StaticResource AnimationTime}"
                             To="40" />
        </Storyboard>
        <Style x:Key="SlideCheckBoxStyle"
               TargetType="{x:Type local:SlideCheckBox}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type local:SlideCheckBox}">
                        <Canvas>
                            <ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                                              Content="{TemplateBinding Content}"
                                              ContentTemplate="{TemplateBinding ContentTemplate}"
                                              RecognizesAccessKey="True"
                                              VerticalAlignment="Center"
                                              HorizontalAlignment="Center" />
                            <Canvas>
                                <!--Background-->
                                <Rectangle Width="{Binding ElementName=ButtonText, Path=ActualWidth}"
                                           Height="{Binding ElementName=ButtonText, Path=ActualHeight}"
                                           Fill="LightBlue" />
                            </Canvas>
                            <Canvas>
                                <!--Button-->
                                <Button Width="{Binding ElementName=CheckedText, Path=ActualWidth}"
                                        Height="{Binding ElementName=ButtonText, Path=ActualHeight}"
                                        Name="CheckButton"
                                        Command="{x:Static local:SlideCheckBox.SlideCheckBoxClicked}">
                                    <Button.RenderTransform>
                                        <TransformGroup>
                                            <TranslateTransform />
                                        </TransformGroup>
                                    </Button.RenderTransform>
                                </Button>
                            </Canvas>
                            <Canvas>
                                <!--Text-->
                                <StackPanel Name="ButtonText"
                                            Orientation="Horizontal"
                                            IsHitTestVisible="False">
                                    <Grid Name="CheckedText">
                                        <Label Margin="7 0"
                                               Content="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:SlideCheckBox}}, Path=CheckedText}" />
                                    </Grid>
                                    <Grid Name="UncheckedText"
                                          HorizontalAlignment="Right">
                                        <Label Margin="7 0"
                                               Content="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:SlideCheckBox}}, Path=UncheckedText}" />
                                    </Grid>
                                </StackPanel>
                            </Canvas>
                        </Canvas>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsChecked"
                                     Value="True">
                                <Trigger.EnterActions>
                                    <BeginStoryboard Storyboard="{StaticResource OnChecking}" />
                                </Trigger.EnterActions>
                                <Trigger.ExitActions>
                                    <BeginStoryboard Storyboard="{StaticResource OnUnchecking}" />
                                </Trigger.ExitActions>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </CheckBox.Resources>
    <CheckBox.CommandBindings>
        <CommandBinding Command="{x:Static local:SlideCheckBox.SlideCheckBoxClicked}"
                        Executed="OnSlideCheckBoxClicked" />
    </CheckBox.CommandBindings>
</CheckBox>

Et le code derrière :

using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace Smt.Controls
{
    public partial class SlideCheckBox : CheckBox
    {
        public SlideCheckBox()
        {
            InitializeComponent();
            Loaded += OnLoaded;
        }

        public static readonly DependencyProperty CheckedTextProperty = DependencyProperty.Register("CheckedText", typeof(string), typeof(SlideCheckBox), new PropertyMetadata("Checked Text"));
        public string CheckedText
        {
            get { return (string)GetValue(CheckedTextProperty); }
            set { SetValue(CheckedTextProperty, value); }
        }

        public static readonly DependencyProperty UncheckedTextProperty = DependencyProperty.Register("UncheckedText", typeof(string), typeof(SlideCheckBox), new PropertyMetadata("Unchecked Text"));
        public string UncheckedText
        {
            get { return (string)GetValue(UncheckedTextProperty); }
            set { SetValue(UncheckedTextProperty, value); }
        }

        public static readonly RoutedCommand SlideCheckBoxClicked = new RoutedCommand();

        void OnLoaded(object sender, RoutedEventArgs e)
        {
            Style style = TryFindResource("SlideCheckBoxStyle") as Style;
            if (!ReferenceEquals(style, null))
            {
                Style = style;
            }
        }

        void OnSlideCheckBoxClicked(object sender, ExecutedRoutedEventArgs e)
        {
            IsChecked = !IsChecked;
        }
    }
}

Le problème se pose lorsque j'essaie de lier l'attribut "To" des DoubleAnimations à la largeur réelle du texte, comme je le fais dans le ControlTemplate. Si je lie les valeurs à une largeur réelle d'un élément dans le ControlTemplate, le contrôle apparaît comme une case à cocher vide (ma classe de base). Cependant, je lie les mêmes ActualWidths dans le ControlTemplate lui-même sans aucun problème. Il semble que ce soit les ressources CheckBox.Resources qui posent problème.

Par exemple, ce qui suit va le briser :

        <DoubleAnimation Storyboard.TargetName="CheckButton"
                         Storyboard.TargetProperty="(Button.Width)"
                         Duration="{StaticResource AnimationTime}"
                         To="{Binding ElementName=CheckedText, Path=ActualWidth}" />

Je ne sais pas si c'est parce qu'il essaie de se lier à une valeur qui n'existe pas tant qu'un passage de rendu n'est pas effectué, ou si c'est autre chose. Quelqu'un a-t-il une expérience de ce type de liaison d'animation ?

60voto

Jason Points 1450

J'ai connu des situations similaires dans ControlTemplate où j'ai voulu lier l'attribut "To" à une valeur (plutôt que de l'encoder en dur), et j'ai fini par trouvé une solution .

Petite note complémentaire : si vous creusez un peu sur le web, vous trouverez exemples de personnes capables d'utiliser la liaison de données pour les propriétés "From" ou "To". Cependant, dans ces exemples, les Storyboards sont pas dans un Style ou un ControlTemplate . Si votre Storyboard se trouve dans un Style ou un ControlTemplate, vous devrez utiliser une approche différente, comme cette solution.

Cette solution permet de contourner le problème du freezable car elle anime simplement une valeur double de 0 à 1. Elle fonctionne grâce à une utilisation astucieuse de la propriété Tag et d'un convertisseur Multiply. Vous utilisez un multibinding pour vous lier à la fois à une propriété souhaitée et à votre "échelle" (la balise), qui sont multipliées ensemble. En gros, l'idée est que la valeur de votre Tag est ce que vous animez, et sa valeur agit comme une "échelle" (de 0 à 1) amenant la valeur de votre attribut souhaité à "pleine échelle" une fois que vous avez animé le Tag à 1.

Vous pouvez le voir en action aquí . Le point essentiel est le suivant :

<local:MultiplyConverter x:Key="multiplyConverter" />
<ControlTemplate x:Key="RevealExpanderTemp" TargetType="{x:Type Expander}">
    <!-- (other stuff here...) -->
    <ScrollViewer x:Name="ExpanderContentScrollView">
        <!-- ** BEGIN IMPORTANT PART #1 ...  -->
        <ScrollViewer.Tag>
            <sys:Double>0.0</sys:Double>
        </ScrollViewer.Tag>
        <ScrollViewer.Height>
            <MultiBinding Converter="{StaticResource multiplyConverter}">
               <Binding Path="ActualHeight" ElementName="ExpanderContent"/>
               <Binding Path="Tag" RelativeSource="{RelativeSource Self}" />
            </MultiBinding>
        </ScrollViewer.Height>
        <!-- ...end important part #1.  -->
        <ContentPresenter x:Name="ExpanderContent" ContentSource="Content"/>

    </ScrollViewer>

  <ControlTemplate.Triggers>
    <Trigger Property="IsExpanded" Value="True">
        <Trigger.EnterActions>
            <BeginStoryboard>
                <Storyboard>
                   <!-- ** BEGIN IMPORTANT PART #2 (make TargetProperty 'Tag') ...  -->
                   <DoubleAnimation Storyboard.TargetName="ExpanderContentScrollView"
                         Storyboard.TargetProperty="Tag"
                         To="1"
                         Duration="0:0:0.4"/>
                    <!-- ...end important part #2 -->
               </Storyboard>
            </BeginStoryboard>
        </Trigger.EnterActions>
    </Trigger>
  </ControlTemplate.Triggers>
</ControlTemplate>

Avec ce convertisseur de valeurs :

public class MultiplyConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
       double result = 1.0;
       for (int i = 0; i < values.Length; i++)
       {
           if (values[i] is double)
               result *= (double)values[i];
       }

       return result;
    }

   public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
   {
       throw new Exception("Not implemented");
   }
}

10voto

WooYek Points 229

Pour autant que je sache, vous ne pouvez pas lier l'animation à/depuis car l'animation doit être figée.

5voto

JCH2k Points 170

J'aime la solution de @Jason Frank. Cependant, elle est encore plus simple et moins sujette aux erreurs si vous n'utilisez pas la balise, mais plutôt, par exemple, la propriété Width d'un élément Border vide et factice. C'est une propriété double native, donc pas besoin de <sys:Double> et vous pouvez nommer la bordure comme vous le feriez avec une variable, comme ceci :

<!-- THIS IS JUST USED FOR SLIDING ANIMATION MATH -->
<!-- animated Border.Width    From 0 to 1 -->
<Border x:Name="Var_Animation_0to1" Width="0"/>
<!-- animated Border.Width    From 0 to (TotalWidth-SliderWidth) -->
<Border x:Name="Var_Slide_Length">
    <Border.Width>
        <MultiBinding Converter="{mvvm:MathConverter}" ConverterParameter="a * (b-c)">
            <Binding ElementName="Var_Animation_0to1" Path="Width"/>
            <Binding ElementName="BackBorder" Path="ActualWidth"/>
            <Binding ElementName="Slider" Path="ActualWidth"/>
        </MultiBinding>
    </Border.Width>
</Border>

Cela rend les fixations beaucoup plus lisibles.

L'animation est toujours 0..1, comme Jason l'a souligné :

<BeginStoryboard Name="checkedSB">
    <Storyboard Storyboard.TargetProperty="Width" Storyboard.TargetName="Var_Animation_0to1">
        <DoubleAnimation To="1" Duration="00:00:00.2"/>
    </Storyboard>
</BeginStoryboard>

Puis liez ce que vous voulez animer à la largeur de la bordure fictive. De cette façon, vous pouvez même enchaîner les convertisseurs les uns aux autres, comme suit :

<Border x:Name="Slider" HorizontalAlignment="Left"
        Margin="{Binding ElementName=Var_Slide_Length, Path=Width, Converter={StaticResource DoubleToThickness}, ConverterParameter=x 0 0 0}"/>

Combiné avec le MathConverter, vous pouvez faire presque tout dans les styles : https://www.codeproject.com/Articles/239251/MathConverter-How-to-Do-Math-in-XAML

2voto

patrick Points 2641

J'ai fait exactement la même chose.

<UserControl x:Class="YOURNAMESPACE.UserControls.SliderControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:YOURNAMESPACE.UserControls"
             xmlns:converter="clr-namespace:YOURNAMESPACE.ValueConverters"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300"
             SizeChanged="UserControl_SizeChanged">
    <UserControl.Resources>

        <converter:MathConverter x:Key="mathConverter" />

        <LinearGradientBrush x:Key="CheckedBlue" StartPoint="0,0" EndPoint="0,1">
            <GradientStop Color="#e4f5fc" Offset="0" />
            <GradientStop Color="#e4f5fc" Offset="0.1" />
            <GradientStop Color="#e4f5fc" Offset="0.1" />
            <GradientStop Color="#9fd8ef" Offset="0.5" />
            <GradientStop Color="#9fd8ef" Offset="0.5" />
            <GradientStop Color="#bfe8f9" Offset="1" />
        </LinearGradientBrush>
        <LinearGradientBrush x:Key="CheckedOrange" StartPoint="0,0" EndPoint="0,1">
            <GradientStop Color="#FFCA6A13" Offset="0" />
            <GradientStop Color="#FFF67D0C" Offset="0.1" />
            <GradientStop Color="#FFFE7F0C" Offset="0.1" />
            <GradientStop Color="#FFFA8E12" Offset="0.5" />
            <GradientStop Color="#FFFF981D" Offset="0.5" />
            <GradientStop Color="#FFFCBC5A" Offset="1" />
        </LinearGradientBrush>

        <SolidColorBrush x:Key="CheckedOrangeBorder" Color="#FF8E4A1B" />
        <SolidColorBrush x:Key="CheckedBlueBorder" Color="#FF143874" />

        <Style x:Key="CheckBoxSlider" TargetType="{x:Type CheckBox}">
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}" />
            <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}" />

            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type CheckBox}" >

                        <DockPanel x:Name="dockPanel" 
                               Width="{TemplateBinding ActualWidth}" 
                               Height="{TemplateBinding Height}" >
                            <DockPanel.Resources>

                                <Storyboard x:Key="ShowRightStoryboard">
                                    <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="slider" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)">
                                        <SplineDoubleKeyFrame KeyTime="00:00:00.1000000" Value="0" />
                                    </DoubleAnimationUsingKeyFrames>
                                </Storyboard>

                                <Storyboard x:Key="ShowLeftStoryboard" >
                                    <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" 
                                                           Storyboard.TargetName="slider" 
                                                           Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)"
                                                           >
                                        <SplineDoubleKeyFrame x:Name="RightHalfKeyFrame" KeyTime="00:00:00.1000000" Value="300" />
                                    </DoubleAnimationUsingKeyFrames>
                                </Storyboard>
                            </DockPanel.Resources>

                            <ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" 
                                          Content="{TemplateBinding Content}" 
                                          ContentStringFormat="{TemplateBinding ContentStringFormat}" 
                                          ContentTemplate="{TemplateBinding ContentTemplate}" 
                                          RecognizesAccessKey="True" 
                                          VerticalAlignment="Center" />
                            <Grid>

                                <Border x:Name="BackgroundBorder" BorderBrush="#FF939393" BorderThickness="1" CornerRadius="3" 

                                Width="{TemplateBinding ActualWidth}" 
                                Height="{TemplateBinding Height}" >

                                    <Border.Background>
                                        <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                                            <GradientStop Color="#FFB5B5B5" Offset="0" />
                                            <GradientStop Color="#FFDEDEDE" Offset="0.1" />
                                            <GradientStop Color="#FFEEEEEE" Offset="0.5" />
                                            <GradientStop Color="#FFFAFAFA" Offset="0.5" />
                                            <GradientStop Color="#FFFEFEFE" Offset="1" />
                                        </LinearGradientBrush>
                                    </Border.Background>
                                    <Grid>
                                        <Grid.ColumnDefinitions>
                                            <ColumnDefinition />
                                            <ColumnDefinition />
                                        </Grid.ColumnDefinitions>
                                        <TextBlock x:Name="LeftTextBlock"  Text="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:SliderControl}}, Path=LeftText, Mode=TwoWay}" Grid.Column="0" HorizontalAlignment="Center" VerticalAlignment="Center"  />
                                        <TextBlock x:Name="RightTextBlock"  Text="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:SliderControl}}, Path=RightText, Mode=TwoWay}" Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Center"  />
                                    </Grid>
                                </Border>

                                <Border x:Name="slider" 
                                    BorderBrush="#FF939393" 
                                    HorizontalAlignment="Left" 
                                    Width="{TemplateBinding ActualWidth, Converter={StaticResource mathConverter}, ConverterParameter=/2}" 
                                    Height="{TemplateBinding Height}"
                                    BorderThickness="1" 
                                    CornerRadius="3" 
                                    RenderTransformOrigin="0.5,0.5" Margin="0"
                                    >
                                    <Border.RenderTransform>
                                        <TransformGroup>
                                            <ScaleTransform ScaleX="1" ScaleY="1" />
                                            <SkewTransform AngleX="0" AngleY="0" />
                                            <RotateTransform Angle="0" />
                                            <TranslateTransform X="{TemplateBinding ActualWidth, Converter={StaticResource mathConverter}, ConverterParameter=/2}" Y="0" />
                                        </TransformGroup>
                                    </Border.RenderTransform>
                                    <Border.Background>
                                        <LinearGradientBrush EndPoint="0,1" StartPoint="0,0">
                                            <GradientStop Color="#FFF0F0F0" Offset="0" />
                                            <GradientStop Color="#FFCDCDCD" Offset="0.1" />
                                            <GradientStop Color="#FFFBFBFB" Offset="1" />
                                        </LinearGradientBrush>
                                    </Border.Background>
                                    <DockPanel Background="Transparent" LastChildFill="False">
                                        <Viewbox x:Name="SlideRight" Stretch="Uniform" Width="28" Height="28" DockPanel.Dock="Right" Margin="0,0,50,0" >
                                            <Path  Stretch="Fill"  Fill="{DynamicResource TextBrush}">
                                                <Path.Data>
                                                    <PathGeometry Figures="m 27.773437 48.874779 -8.818359 9.902343 -4.833984 0 8.847656 -9.902343 -8.847656 -10.019532 4.833984 0 z m -11.396484 0 -8.7597655 9.902343 -4.9804687 0 9.0234372 -9.902343 -9.0234372 -10.019532 4.9804687 0 z" FillRule="NonZero"/>
                                                </Path.Data>
                                            </Path>
                                        </Viewbox>
                                        <Viewbox x:Name="SlideLeft" Stretch="Uniform" Width="28" Height="28" DockPanel.Dock="Left" Margin="50,0,0,0" >
                                            <Path  Stretch="Fill"  Fill="{DynamicResource TextBrush}">
                                                <Path.LayoutTransform>
                                                    <TransformGroup>
                                                        <ScaleTransform ScaleX="-1"/>
                                                    </TransformGroup>
                                                </Path.LayoutTransform>
                                                <Path.Data>
                                                    <PathGeometry Figures="m 27.773437 48.874779 -8.818359 9.902343 -4.833984 0 8.847656 -9.902343 -8.847656 -10.019532 4.833984 0 z m -11.396484 0 -8.7597655 9.902343 -4.9804687 0 9.0234372 -9.902343 -9.0234372 -10.019532 4.9804687 0 z" FillRule="NonZero"/>
                                                </Path.Data>
                                            </Path>
                                        </Viewbox>
                                    </DockPanel>
                                </Border>
                            </Grid>
                        </DockPanel>

                        <ControlTemplate.Triggers>
                            <Trigger Property="IsChecked" Value="True">
                                <Setter TargetName="BackgroundBorder" Property="Background" Value="{StaticResource CheckedOrange}" />
                                <Setter TargetName="BackgroundBorder" Property="BorderBrush" Value="{StaticResource CheckedOrangeBorder}" />
                                <Setter TargetName="SlideRight" Property="Visibility" Value="Collapsed" />
                                <Setter TargetName="SlideLeft" Property="Visibility" Value="Visible" />
                            </Trigger>
                            <Trigger Property="IsChecked" Value="False">
                                <Setter TargetName="BackgroundBorder" Property="Background" Value="{StaticResource CheckedBlue}" />
                                <Setter TargetName="BackgroundBorder" Property="BorderBrush" Value="{StaticResource CheckedBlueBorder}" />
                                <Setter TargetName="SlideRight" Property="Visibility" Value="Visible" />
                                <Setter TargetName="SlideLeft" Property="Visibility" Value="Collapsed" />
                            </Trigger>
                        </ControlTemplate.Triggers>

                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

    </UserControl.Resources>

    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition  Width="*"/>
        </Grid.ColumnDefinitions>

        <CheckBox   x:Name="checkBox" 
                    Style="{StaticResource CheckBoxSlider}" 
                    HorizontalAlignment="Stretch"
                    DockPanel.Dock="Top" 
                    Height="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:SliderControl}}, Path=Height, Mode=TwoWay}"
                    IsChecked="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:SliderControl}}, Path=IsLeftVisible, Mode=TwoWay}"
                    Checked="CheckBox_Checked" 
                    Unchecked="CheckBox_Unchecked"
                    />
    </Grid>
</UserControl>

code derrière.

namespace YOURNAMESPACE.UserControls
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows;
    using System.Windows.Controls;
    using System.Windows.Data;
    using System.Windows.Documents;
    using System.Windows.Input;
    using System.Windows.Media;
    using System.Windows.Media.Animation;
    using System.Windows.Media.Imaging;
    using System.Windows.Navigation;
    using System.Windows.Shapes;

    /// <summary>
    /// Interaction logic for SliderControl.xaml
    /// </summary>
    public partial class SliderControl : UserControl
    {
        public static readonly DependencyProperty IsLeftVisibleProperty =
         DependencyProperty.RegisterAttached(
             "IsLeftVisible",
             typeof(bool),
             typeof(SliderControl),
             new UIPropertyMetadata(true, IsLeftVisibleChanged));

        public static readonly DependencyProperty LeftTextProperty =
            DependencyProperty.RegisterAttached(
                "LeftText",
                typeof(string),
                typeof(SliderControl),
                new UIPropertyMetadata(null, LeftTextChanged));

        public static readonly DependencyProperty RightTextProperty =
        DependencyProperty.RegisterAttached(
            "RightText",
            typeof(string),
            typeof(SliderControl),
            new UIPropertyMetadata(null, RightTextChanged));

         /// <summary>
        /// Initializes a new instance of the <see cref="SliderControl"/> class.
        /// </summary>
        public SliderControl()
        {
            this.InitializeComponent();
        }

        public string LeftText { get; set; }

        public string RightText { get; set; }

        [AttachedPropertyBrowsableForType(typeof(SliderControl))]
        public static bool GetIsLeftVisible(SliderControl sliderControl)
        {
            return (bool)sliderControl.GetValue(IsLeftVisibleProperty);
        }

        [AttachedPropertyBrowsableForType(typeof(SliderControl))]
        public static string GetLeftText(SliderControl sliderControl)
        {
            return (string)sliderControl.GetValue(LeftTextProperty);
        }

        public static void SetIsLeftVisible(SliderControl sliderControl, bool value)
        {
            sliderControl.SetValue(IsLeftVisibleProperty, value);
        }

        public static void IsLeftVisibleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            SliderControl slider = d as SliderControl;

            if ((bool)e.NewValue == true)
            {
                slider.RunAnimation("ShowLeftStoryboard");
            }
            else
            {
                slider.RunAnimation("ShowRightStoryboard");
            }
        }

        [AttachedPropertyBrowsableForType(typeof(SliderControl))]
        public static string GetRightText(SliderControl sliderControl)
        {
            return (string)sliderControl.GetValue(RightTextProperty);
        }

        public static void SetLeftText(SliderControl sliderControl, string value)
        {
            sliderControl.SetValue(LeftTextProperty, value);
        }

        public static void SetRightText(SliderControl sliderControl, string value)
        {
            sliderControl.SetValue(RightTextProperty, value);
        }

        private static void LeftTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            SliderControl slider = d as SliderControl;
            slider.LeftText = e.NewValue as string;
        }

        private static void RightTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            SliderControl slider = d as SliderControl;
            slider.RightText = e.NewValue as string;
        }

        private void UserControl_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            this.checkBox.Width = e.NewSize.Width;

            CheckBox cb = this.checkBox;
            var controlTemplate = cb.Template;

            DockPanel dockPanel = controlTemplate.FindName("dockPanel", cb) as DockPanel;
            Storyboard story = dockPanel.Resources["ShowLeftStoryboard"] as Storyboard;

            DoubleAnimationUsingKeyFrames dk = story.Children[0] as DoubleAnimationUsingKeyFrames;
            SplineDoubleKeyFrame sk = dk.KeyFrames[0] as SplineDoubleKeyFrame;

            // must manipulate this in code behind, binding does not work, 
            // also it cannot be inside of a control template 
            // because storyboards in control templates become frozen and cannot be modified
            sk.Value = cb.Width / 2;

            if (cb.IsChecked == true)
            {
                story.Begin(cb, cb.Template);
            }
        }

        private void CheckBox_Checked(object sender, RoutedEventArgs e)
        {
            this.RunAnimation("ShowLeftStoryboard");
        }

        private void CheckBox_Unchecked(object sender, RoutedEventArgs e)
        {
            this.RunAnimation("ShowRightStoryboard");
        }

        private void RunAnimation(string storyboard)
        {
            CheckBox cb = this.checkBox;
            var controlTemplate = cb.Template;

            DockPanel dockPanel = controlTemplate.FindName("dockPanel", cb) as DockPanel;

            if (dockPanel != null)
            {
                Storyboard story = dockPanel.Resources[storyboard] as Storyboard;

                DoubleAnimationUsingKeyFrames dk = story.Children[0] as DoubleAnimationUsingKeyFrames;
                SplineDoubleKeyFrame sk = dk.KeyFrames[0] as SplineDoubleKeyFrame;
                story.Begin(cb, cb.Template);
            }
        }
    }
}

IValueConverter

namespace YOURNAMESPACE.ValueConverters
{
    using System;
    using System.Collections.Generic;
    using System.Data;
    using System.Globalization;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Data;
      /// <summary>
        /// Does basic math operations, eg. value = 60 parameter = "*2 + 1", result = 121
        /// </summary>
        /// <seealso cref="System.Windows.Data.IValueConverter" />
        [ValueConversion(typeof(double), typeof(double))]
        public class MathConverter : IValueConverter
        {
            public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
            {
                double d = (double)value;
                string mathExpression = d.ToString() + parameter;

                if (mathExpression.Contains("^"))
                {
                    throw new Exception("Doesn't handle powers or square roots");
                }

                DataTable table = new DataTable();
                table.Columns.Add("expression", typeof(string), mathExpression);
                DataRow row = table.NewRow();
                table.Rows.Add(row);
                double ret = double.Parse((string)row["expression"]);

                if (ret <= 0)
                {
                    return 1d;
                }

                return ret;
            }

            public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
            {
                // not implemented
                return null;
            }
        }
}

exemple d'utilisation :

<chart:SliderControl x:Name="sliderControl" 
                                                         LeftText="{Binding Path=LeftTextProperty}"
                                                         RightText="{Binding Path=RightTextProperty}"
                                                         Grid.Row="0" 
                                                         IsLeftVisible="{Binding Path=IsLeftVisible, Mode=TwoWay}" 
                                                         Height="35"  />

0voto

Stephen Hewlett Points 1459

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