Arrastre de un control de usuario de WPF

Question

Me moví crear usercontrol

<UserControl x:Class="Restaurant.Views.Managerer.TablePanel" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
     xmlns:local="clr-namespace:Restaurant.Helpers.Converter" 
     mc:Ignorable="d" 
     x:Name="root" 
     MouseLeftButtonDown="root_MouseLeftButtonDown" 
     MouseLeftButtonUp="root_MouseLeftButtonUp" 
     MouseMove="root_MouseMove"  
     DataContext="{Binding RelativeSource={RelativeSource Self}}"> 
.... 

código

Point anchorPoint; 
     Point currentPoint; 
     bool isInDrag = false; 

     private void root_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) 
     { 
      var element = sender as FrameworkElement; 
      anchorPoint = e.GetPosition(null); 
      element.CaptureMouse(); 
      isInDrag = true; 
      e.Handled = true; 
     } 

     private void root_MouseMove(object sender, MouseEventArgs e) 
     { 
      if (isInDrag) 
      { 
       var element = sender as FrameworkElement; 
       currentPoint = e.GetPosition(null); 

       var transform = new TranslateTransform 
            { 
             X = (currentPoint.X - anchorPoint.X), 
             Y = (currentPoint.Y - anchorPoint.Y) 
            }; 
       this.RenderTransform = transform; 
       anchorPoint = currentPoint; 
      } 
     } 

     private void root_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) 
     { 
      if (isInDrag) 
      { 
       var element = sender as FrameworkElement; 
       element.ReleaseMouseCapture(); 
       isInDrag = false; 
       e.Handled = true; 
      } 
     } 

si cambiar el código

X = (currentPoint.X - anchorPoint.X), 
Y = (currentPoint.Y - anchorPoint.Y) 

a

X = (currentPoint.X), 
Y = (currentPoint.Y) 

Puedo mover el control de usuario, pero el mouse y el control de usuario no coinciden

Answer 1

Buenos días. He dormido y se me ocurre)))

private TranslateTransform transform = new TranslateTransform(); 
     private void root_MouseMove(object sender, MouseEventArgs e) 
     { 
      if (isInDrag) 
      { 
       var element = sender as FrameworkElement; 
       currentPoint = e.GetPosition(null); 

       transform.X += currentPoint.X - anchorPoint.X; 
       transform.Y += (currentPoint.Y - anchorPoint.Y); 
       this.RenderTransform = transform; 
       anchorPoint = currentPoint; 
      } 
     } 

Answer 2

Realmente no estoy seguro de qué es exactamente lo que intentas lograr en tu pregunta, pero los Thumbs son mucho más fáciles de arrastrar. Puede ver una explicación y un código de muestra (en la parte inferior) here.

Answer 3

En base a la información en @Mediator respuesta. He subido y editado para evitar que el control se salga de los límites.

private TranslateTransform transform = new TranslateTransform(); 
    private void root_MouseMove(object sender, MouseEventArgs e) 
    { 
     if (isInDrag) 
     { 
      var element = sender as FrameworkElement; 
      currentPoint = e.GetPosition(null); 

      transform.X += currentPoint.X - anchorPoint.X; 
      transform.Y += (currentPoint.Y - anchorPoint.Y); 
      if (currentPoint.X < Application.Current.MainWindow.RenderSize.Width && currentPoint.Y < Application.Current.MainWindow.RenderSize.Height 
       && currentPoint.X > 0 && currentPoint.Y > 0) 
      { 
       this.RenderTransform = transform; 
       anchorPoint = currentPoint; 
      } 
      else 
      { 
       transform = new TranslateTransform(); 
       this.RenderTransform = transform; 
      } 
     } 
    } 

Pero los errores de enlace son su ventana de salida en VS.

Parece que este es un problema en WPF, pero uno que Microsoft no solucionará.

Para obtener más información aquí:

https://connect.microsoft.com/VisualStudio/feedback/details/1423399/system-windows-data-error-4-when-using-relativesource-findancestor-inside-a-translatetransform-inside-a-style