我尝试了这个Answer并将其实现到我的代码中，这是我的代码：
XAML
obj["prop1"]["prop2"]["prop3"] . .. .["propn"]
CS
<Window x:Class="DSLayout.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
xmlns:tk="http://schemas.xceed.com/wpf/xaml/toolkit"
xmlns:local="clr-namespace:DSLayout"
Title="MainWindow" Height="720" Width="1280" ResizeMode="NoResize">
<Window.Resources>
<local:BrushColorConverter x:Key="BrushColorConverter"/>
</Window.Resources>
<Grid>
<Border BorderBrush="Silver" BorderThickness="1" Name="borderHeader" Margin="12,12,12,636" />
<Border BorderBrush="Silver" BorderThickness="1" Name="borderEditor" Margin="12,69,850,12">
<Canvas>
<Border BorderBrush="Silver" BorderThickness="1" Canvas.Left="24" Canvas.Top="20" Height="59" Name="border1" Width="355"></Border>
<Canvas Height="59" Canvas.Left="26" Canvas.Top="20"></Canvas>
<TextBlock Name="textBlock1" Text="Color Palette" Height="31" Width="197" FontSize="22" Canvas.Left="40" Canvas.Top="34" />
<tk:ColorPicker x:Name="ColorPalette" ColorMode="ColorCanvas"
SelectedColor="{Binding ElementName=Layout,
Path=Background,
Converter={StaticResource BrushColorConverter}}"
Canvas.Left="243" Canvas.Top="34" Height="31" />
<Button Grid.Row="1" Content="Add Image" Click="AddButtonClick" Canvas.Left="24" Canvas.Top="100" Height="43" Width="104" />
<Border BorderBrush="Silver" BorderThickness="1" Canvas.Left="24" Canvas.Top="227" Height="350" Name="border3" Width="355">
<Canvas>
<TextBlock Canvas.Left="15" Canvas.Top="27" Height="23" Name="textBlock2" Text="X-Pos " FontSize="16" Width="53" />
<TextBlock Canvas.Left="174" Canvas.Top="27" FontSize="16" Height="23" Name="textBlock3" Text="Y-Pos " Width="53" />
<Label Name="posX" Height="23" Width="83" Canvas.Left="74" Canvas.Top="27" />
<Label Name="posY" Canvas.Left="233" Canvas.Top="27" Height="23" Width="83" />
<TextBlock Canvas.Left="15" Canvas.Top="68" FontSize="16" Height="23" Name="textBlock4" Text="Width" Width="53" />
<TextBlock Canvas.Left="174" Canvas.Top="68" FontSize="16" Height="23" Name="textBlock5" Text="Height" Width="53" />
<Label Name="imgHeight" Canvas.Left="74" Canvas.Top="68" Height="23" Width="83" />
<Label Name="imgWidth" Canvas.Left="233" Canvas.Top="68" Height="23" Width="83" />
<!--<TextBlock Canvas.Left="15" Canvas.Top="169" FontSize="16" Height="23" Name="textBlock4" Text="Height" Width="53" />
<TextBlock Canvas.Left="174" Canvas.Top="169" FontSize="16" Height="23" Name="textBlock5" Text="Width" Width="53" />
<TextBox Canvas.Left="74" Canvas.Top="169" Height="23" Name="textBox3" Width="83" />
<TextBox Canvas.Left="233" Canvas.Top="169" Height="23" Name="textBox4" Width="83" />-->
</Canvas>
</Border>
</Canvas>
</Border>
<Border BorderBrush="Silver" BorderThickness="1" Name="borderLayout" Margin="446,69,12,12">
<Canvas x:Name="Layout" Background="White" AllowDrop="True" ClipToBounds="True"
MouseLeftButtonDown="MouseLeftButtonDown"
MouseLeftButtonUp="MouseLeftButtonUp"
MouseMove="MouseMove">
</Canvas>
</Border>
</Grid>
所以我尝试使用ClipToBound =“True”，但如果我拖到画布外面它会丢失。所以我试图使用namespace DSLayout
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
public int imgX { get; set; }
public int imgY { get; set; }
private void AddButtonClick(object sender, RoutedEventArgs e)
{
var dialog = new Microsoft.Win32.OpenFileDialog();
dialog.Filter =
"Image Files (*.jpg; *.png; *.jpeg; *.gif; *.bmp)|*.jpg; *.png; *.jpeg; *.gif; *.bmp";
if ((bool)dialog.ShowDialog())
{
var bitmap = new BitmapImage(new Uri(dialog.FileName));
var image = new Image { Source = bitmap };
this.imgX = bitmap.PixelWidth;
this.imgY = bitmap.PixelWidth;
Canvas.SetLeft(image, 0);
Canvas.SetTop(image, 0);
Layout.Children.Add(image);
imgHeight.Content = bitmap.PixelHeight;
imgWidth.Content = bitmap.PixelWidth;
}
}
private Image draggedImage;
private Point mousePosition;
private void MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
var image = e.Source as Image;
if (image != null && Layout.CaptureMouse())
{
mousePosition = e.GetPosition(Layout);
draggedImage = image;
Panel.SetZIndex(draggedImage, 1);
}
}
private void MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
if (draggedImage != null)
{
Layout.ReleaseMouseCapture();
Panel.SetZIndex(draggedImage, 0);
draggedImage = null;
}
}
private void MouseMove(object sender, MouseEventArgs e)
{
if (draggedImage != null)
{
var position = e.GetPosition(Layout);
var offset = position - mousePosition;
mousePosition = position;
if (mousePosition.X > 0 && mousePosition.Y > 0)
{
Canvas.SetLeft(draggedImage, Canvas.GetLeft(draggedImage) + offset.X);
Canvas.SetTop(draggedImage, Canvas.GetTop(draggedImage) + offset.Y);
}
posX.Content = Canvas.GetLeft(draggedImage);
posY.Content = Canvas.GetTop(draggedImage);
}
}
}
}
作品来限制它，但不是我想要的，因为如果我将它拖到左边并且我从图像的右边拖动它将会超出画布。
我的想法是让draggedImage成为我的光标所以if (mousePosition.X > 0 && mousePosition.Y > 0)它会阻止draggedImage走出画布。那可能吗？
或任何解决这个问题的简单想法？
编辑：
我尝试使用这个代码，但它的工作原理但并不是很好，因为当我将它拖到画布旁边时，它会像从弹药-1一样移动到0。
if (mousePosition.X > 0 && mousePosition.Y > 0)答案 0 :(得分：1)
当您拖动项目时，通过指定Canvas的附加属性Canvas.Left和Canvas.Top来更改它的X和Y位置。因此很容易确保拖动的元素不会被拖到它的面板之外。
double canvasSize = 800;
double newLeft = Canvas.GetLeft(draggedImage) + offset.X;
double newTop = Canvas.GetTop(draggedImage) + offset.Y;
if (newLeft < 0)
newLeft = 0;
else if (newLeft + draggedImage.ActualWidth > canvasSize)
newLeft = canvasSize - draggedImage.ActualWidth;
if (newTop < 0)
newTop = 0;
else if (newTop + draggedImage.ActualHeight > canvasSize)
newTop = canvasSize - draggedImage.ActualHeight;
Canvas.SetLeft(draggedImage, newLeft);
Canvas.SetTop(draggedImage, newTop);
这将检查您拖动的元素是否超出了画布。