用户控件的位置在WPF [英] UserControl Location in WPF
问题描述
我是新WPF中，我创建了一个新的用户控件的MyUserControl。
现在我觉得很奇怪：在UserContol没有一个位置
。我怎么能读（由code）myUserControl1。位置在父容器？
我解释一下：
我有一些点（用户控件），用户可以在面板上拖动。其实，我不知道什么样的面板，这将是...或许电网。
现在，这些点应该用线相连。
其实，我有一个 Dot.Head 和 Dot.Queue 属性（也点）。所以，当一个头部或队列加，我需要dinamically创建它们之间的联系（线）[A] ----- [B]。这对于这条线我搜索的起点和终点设置。
控制XAML：
＆LT;用户控件X：类=LinePlan.Stop
的xmlns =http://schemas.microsoft.com/winfx/2006/xaml/$p$psentation
的xmlns：X =http://schemas.microsoft.com/winfx/2006/xaml
的xmlns：MC =http://schemas.openxmlformats.org/markup-compatibility/2006
的xmlns：D =http://schemas.microsoft.com/ex$p$pssion/blend/2008
MC：可忽略=DD：DesignHeight =21D：DesignWidth =80＆GT;
＆LT;画布＆GT;
＆LT;路径填充=浅蓝色WIDTH =16高度=16＆GT;
＆LT; Path.Data＆GT;
＆LT; EllipseGeometry X：名称=点中心=8,8
半径X =4半径=4/＆GT;
＆LT; /Path.Data>
＆LT; /路径＆GT;
＆LT; TextBlock的X：名称=StopText文本=艾菲尔铁塔Canvas.Left =16/＆GT;
＆LT; /帆布＆GT;
＆LT; /用户控件＆GT;
code：
公共部分类停止：用户控件
{
私人停止头;
私人停止尾;
私人LineGeometry标题;
私人LineGeometry queueLine;
公共停止（）
{
的InitializeComponent（）;
}
市民停止头
{
{返回头; }
组
{
如果（头！=值）
{
头=价值;
如果（头== NULL）
{
如果（标题！= NULL）
标题= NULL;
}
其他
{
标题=新LineGeometry（）;
headLine.StartPoint = head.DotPosition;
headLine.EndPoint = this.DotPosition;
//？添加此行到父
}
}
}
}
市民停止尾
{
{返回尾; }
集合{尾=价值; }
}
公共点DotPosition
{
得到
{
双X = Canvas.GetLeft（本）+ this.Dot.Center.X;
双Y = Canvas.GetTop（本）+ this.Dot.Center.Y;
返回新的点（X，Y）;
}
组
{
Canvas.SetLeft（这一点，value.X - this.Dot.Center.X）;
Canvas.SetTop（这一点，value.Y - this.Dot.Center.Y）;
}
}
}
在WPF布局系统不使用绝对定位，除非你把你的控件在支持绝对定位的容器（通常为帆布）。如果您使用的是画布，您可以获取或使用设置控件的位置 Canvas.Left ， Canvas.Right ， Canvas.Top 和 Canvas.Bottom 附加属性：
双X = Canvas.GetLeft（myControl）;
双Y = Canvas.GetTop（myControl）;
现在，如果你想控制的实际位置（相对于其父）时，您可以使用 VisualTreeHelper.GetOffset 方法：
矢量偏移= VisualTreeHelper.GetOffset（myControl）;
双X = offset.X;
双Y = offset.Y;
I am new in WPF, I created a new UserControl MyUserControl.
Now I am surprised: the UserContol does not have a location.
How can I read (by code) myUserControl1.Location in the parent container?
I explain:
I have some Dots (UserControls) that the user can drag in a panel. Actually, I am not sure what kind of Panel this will be... Perhaps Grid.
Now, these dots should be linked with a Line.
Actually, I have a Dot.Head and Dot.Queue properties (also Dots). So, when a Head or Queue is added, I need to dinamically create a link (Line) between them [A]-----[B]. This for this Line I search the Start and End points to set.
Control XAML:
<UserControl x:Class="LinePlan.Stop"
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"
mc:Ignorable="d" d:DesignHeight="21" d:DesignWidth="80">
<Canvas>
<Path Fill="LightBlue" Width="16" Height="16">
<Path.Data>
<EllipseGeometry x:Name="Dot" Center="8,8"
RadiusX="4" RadiusY="4"/>
</Path.Data>
</Path>
<TextBlock x:Name="StopText" Text="Eiffel Tower" Canvas.Left="16"/>
</Canvas>
</UserControl>
Code:
public partial class Stop : UserControl
{
private Stop head;
private Stop tail;
private LineGeometry headLine;
private LineGeometry queueLine;
public Stop()
{
InitializeComponent();
}
public Stop Head
{
get { return head; }
set
{
if (head != value)
{
head = value;
if (head == null)
{
if (headLine != null)
headLine = null;
}
else
{
headLine = new LineGeometry();
headLine.StartPoint = head.DotPosition;
headLine.EndPoint = this.DotPosition;
// ?? Add this line to the parent
}
}
}
}
public Stop Tail
{
get { return tail; }
set { tail = value; }
}
public Point DotPosition
{
get
{
double x = Canvas.GetLeft(this) + this.Dot.Center.X;
double y = Canvas.GetTop(this) + this.Dot.Center.Y;
return new Point(x, y);
}
set
{
Canvas.SetLeft(this, value.X - this.Dot.Center.X);
Canvas.SetTop(this, value.Y - this.Dot.Center.Y);
}
}
}
The WPF layout system doesn't use absolute positioning, unless you're placing your controls on a container that supports absolute positioning (typically a Canvas). If you're using a Canvas, you can get or set the position of the control using the Canvas.Left, Canvas.Right, Canvas.Top and Canvas.Bottom attached properties:
double x = Canvas.GetLeft(myControl);
double y = Canvas.GetTop(myControl);
Now, if you want the actual location of the control (relative to its parent), you can use the VisualTreeHelper.GetOffset method:
Vector offset = VisualTreeHelper.GetOffset(myControl);
double x = offset.X;
double y = offset.Y;
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