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我需要帮助更正拖动后我的拇指拖动或我的动画。我基本上要的步骤是：在滚动柄WPF C＃动画大拇指
- 用户左键点击，在窗口拖动手柄+图像 水平。
- 手柄+图像要么捕捉到左边的窗口边缘，或手柄 将捕捉到右边的窗口边缘与隐藏到 权
- 如果用户释放左键的同时拖动图像时， 手柄+图像将继续沿着其朝向左边或右边窗口边缘的方向 并与其对齐，cf ＃2
现在，加载后，它正在按照我的要求工作，但对于随后的拖动，拇指拖动可见性消失了。它只是跳到我释放左键单击并从那里继续捕捉动画的位置。
我已经尝试了各种解决方法，尽我所能，但似乎没有解决方案。最小代码如下。
MainWindow.xaml
<Window x:Class="TouchSample.MainWindow"
Name="Window_TouchSample"
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:TouchSample"
mc:Ignorable="d"
Title="MainWindow"
Height="600" Width="600"
xmlns:custom="clr-namespace:TouchSample">
<Grid Name="Grid_TouchableThing">
<custom:TouchableThing />
</Grid>
</Window>
TouchableThing.xaml
<UserControl x:Class="TouchSample.TouchableThing"
Name="Scroll_UserControl"
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:TouchSample"
mc:Ignorable="d"
d:DesignHeight="600" d:DesignWidth="600">
<Canvas x:Name="Scroll_Canvas">
<Thumb Name="Scroll_thumb"
Canvas.Left="20"
Canvas.Top="120"
Canvas.ZIndex="3"
DragDelta="Thumb_DragDelta"
PreviewMouseLeftButtonUp="Scroll_thumb_PreviewMouseLeftButtonUp">
<Thumb.Template>
<ControlTemplate>
<StackPanel Name="Scroll_thumb_StackPanel"
Orientation="Horizontal">
<Border Name="Scroll_thumb_StackPanel_Border" Background="Black" Padding="1">
<TextBlock Name="Scroll_thumb_StackPanel_Border_TextBlock"
Text="Scroll"
Background="Silver"
TextAlignment="Center"
MouseLeftButtonDown="TextBlock_MouseLeftButtonDown"
>
<TextBlock.LayoutTransform>
<RotateTransform Angle="90"/>
</TextBlock.LayoutTransform>
</TextBlock>
</Border>
<Button Background="Yellow" Padding="1">
<Image Name="Scroll_thumb_StackPanel_Button_Image" Source="Assets/long-ancient-scroll-4499037_x4.jpg" />
</Button>
</StackPanel>
</ControlTemplate>
</Thumb.Template>
</Thumb>
</Canvas>
</UserControl>
TouchableThing.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
namespace TouchSample
{
/// <summary>
/// Interaction logic for TouchableThing.xaml
/// </summary>
public partial class TouchableThing : UserControl
{
private double toLeftValue = 0;
private double toRightValue = 550; // will get overwritten in OnWindowSizeChanged
private bool isGoingLeft = false;
private bool isGoingRight = false;
private double lastDiffX;
public TouchableThing()
{
InitializeComponent();
this.SizeChanged += OnWindowSizeChanged;
}
private void OnWindowSizeChanged(object sender, SizeChangedEventArgs e)
{
//throw new NotImplementedException();
//Console.WriteLine("sender: " + sender.ToString());
//Console.WriteLine("sender.GetType(): " + sender.GetType().ToString());
//Console.WriteLine("e: " + e.ToString());
toRightValue = e.NewSize.Width;
var aBorder = VisualHierarchyHelper.FindChild<Border>(Scroll_thumb, "Scroll_thumb_StackPanel_Border");
if (aBorder != null)
{
Console.WriteLine("aBorder.ActualWidth: " + aBorder.ActualWidth.ToString());
Console.WriteLine("aBorder.RenderSize.Height: " + aBorder.RenderSize.Height.ToString());
toRightValue -= aBorder.ActualWidth;
}
Console.WriteLine("toRightValue=" + toRightValue.ToString());
}
// https://wpf.2000things.com/2012/12/19/715-using-the-thumb-control-to-drag-objects-on-a-canvas/
private void Thumb_DragDelta(object sender, DragDeltaEventArgs e)
{
//UIElement thumb = e.Source as UIElement;
UIElement thumb = sender as UIElement;
double xChange = Canvas.GetLeft(thumb) + e.HorizontalChange;
if(xChange >= toLeftValue && xChange <= toRightValue)
{
Canvas.SetLeft(thumb, xChange);
//Canvas.SetTop(thumb, Canvas.GetTop(thumb) + e.VerticalChange);
//Console.WriteLine("e.HorizontalChange=" + e.HorizontalChange);
if (e.HorizontalChange > 0)
{
isGoingLeft = false;
isGoingRight = true;
}
else if (e.HorizontalChange < 0)
{
isGoingLeft = true;
isGoingRight = false;
}
else
{
isGoingLeft = false;
isGoingRight = false;
}
lastDiffX = xChange;
}
}
private void goLeft(UIElement theUIElement, double fromX)
{
DoubleAnimation goLeftAnim = new DoubleAnimation();
goLeftAnim.From = fromX;
goLeftAnim.To = toLeftValue;
goLeftAnim.Duration = new Duration(TimeSpan.FromSeconds(2));
theUIElement.BeginAnimation(Canvas.LeftProperty, goLeftAnim);
}
private void goRight(UIElement theUIElement, double fromX)
{
DoubleAnimation goRightAnim = new DoubleAnimation();
goRightAnim.From = fromX;
goRightAnim.To = toRightValue;
goRightAnim.Duration = new Duration(TimeSpan.FromSeconds(2));
theUIElement.BeginAnimation(Canvas.LeftProperty, goRightAnim);
}
private void TextBlock_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
TextBlock aTextBlock = sender as TextBlock;
//Console.WriteLine("TextBlock_MouseLeftButtonDown: Changing TextBlock Background colour to Gray");
aTextBlock.Background = Brushes.Gray;
}
private void Scroll_thumb_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
var aTextBlock = VisualHierarchyHelper.FindChild<TextBlock>(Scroll_thumb, "Scroll_thumb_StackPanel_Border_TextBlock");
if (Mouse.LeftButton == MouseButtonState.Released && aTextBlock != null)
{
//Console.WriteLine("Scroll_thumb_PreviewMouseLeftButtonUp: Changing TextBlock Background colour to Silver");
//Console.WriteLine(" found aTextBlock");
aTextBlock.Background = Brushes.Silver;
}
if (isGoingLeft)
goLeft(Scroll_thumb, lastDiffX);
else if (isGoingRight)
goRight(Scroll_thumb, lastDiffX);
}
}
}
我刚开始用WPF只用了一年的关于C＃经验和WinForms，所以任何帮助非常感谢。
Sryn