WPF后台写ControlTemplate总结
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这段时间写ControlTemplate的时候发现绑定的时候有些问题需要总结：
实例ControlTemplate如下：
<UserControl x:Class="ArcGISWpfMarkTest.TestSymbol" 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:esri="http://schemas.esri.com/arcgis/client/2009" xmlns:local="clr-namespace:ArcGISWpfMarkTest" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300"> <UserControl.Resources> <esri:MarkerSymbol x:Key="Small" OffsetX="60" OffsetY="72"> <esri:MarkerSymbol.ControlTemplate> <ControlTemplate> <Grid> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="CommonStates"> <VisualState x:Name="Normal" /> <VisualState x:Name="MouseOver"> <Storyboard> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="ImageNormal"> <DiscreteObjectKeyFrame KeyTime="0" Value="{x:Static Visibility.Hidden}"/> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="ImageSelected"> <DiscreteObjectKeyFrame KeyTime="0" Value="{x:Static Visibility.Visible}"/> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="label0"> <DiscreteObjectKeyFrame KeyTime="0" Value="{x:Static Visibility.Visible}"/> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> </VisualStateGroup> <VisualStateGroup x:Name="SelectionStates"> <VisualState x:Name="Unselected" /> <VisualState x:Name="Selected"> <Storyboard> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="ImageNormal"> <DiscreteObjectKeyFrame KeyTime="0" Value="{x:Static Visibility.Hidden}"/> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="ImageSelected"> <DiscreteObjectKeyFrame KeyTime="0" Value="{x:Static Visibility.Visible}"/> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="label0"> <DiscreteObjectKeyFrame KeyTime="0" Value="{x:Static Visibility.Visible}"/> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> </VisualStateGroup> </VisualStateManager.VisualStateGroups> <Grid> <Grid.RowDefinitions> <RowDefinition Height="0.2*"></RowDefinition> <RowDefinition Height="0.2*"></RowDefinition> <RowDefinition Height="0.8*"></RowDefinition> </Grid.RowDefinitions> <Label x:Name="label0" Visibility="Visible" Content="{Binding LabelContent1,RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" Grid.Row="0" BorderThickness="0.5" BorderBrush="White" HorizontalContentAlignment="Center" Padding="0" Margin="0" Background="#2b5e93" VerticalContentAlignment="Center" Foreground="White" Width="120" Height="20" FontSize="12"/> <Label x:Name="label1" Visibility="Visible" Content="{Binding LabelContent2,RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" Grid.Row="1" BorderThickness="0.5" BorderBrush="White" HorizontalContentAlignment="Center" Padding="0" Margin="0" Background="#2b5e93" VerticalContentAlignment="Center" Foreground="White" Width="120" Height="20" FontSize="12"/> <Image Name="ImageNormal" Grid.Row="2" Source="/Images/small_police.png" Visibility="Visible"/> <Image Name="ImageSelected" Grid.Row="2" Source="/Images/small_police_hit.png" Visibility="Hidden"/> </Grid> </Grid> </ControlTemplate> </esri:MarkerSymbol.ControlTemplate> </esri:MarkerSymbol> </UserControl.Resources> <Grid> </Grid> </UserControl>
这个ControlTemplate是我定义的Arcgis runtime for wpf中MarkerSymbol的ControlTemplate
首先，我遇到第一个问题是：在map窗口的主程序中调用TestSymbol这个类的实例来引用它的ControlTemplate资源时候遇到两个Label的Content无法绑定
情况如下：TestSymbol类中我定义了LabelContent1和LabelContent2两个属性，在Map窗口的类中：
TestSymbol testSymbol=new TestSymbol();
testSymbol.TryFindResources("Small") as Symbol作为一个Graphic点位的Symbol，这样发现ControlTemplate定义的绑定写法其实根本就错误的。
ControlTemplate作为资源是被Map的主窗口调用，这样它沿着可视树查找的时候的DataContext就是Map的主窗口，所以LabelContent1和LabelContent2两个属性应该定义到
Map的主窗口类中，并且绑定应该这样写Content="{Binding LabelContent1,RelativeSource={RelativeSource AncestorType={x:Type Window}}}"
但是这样做的话对我的程序来说没有意义，我不可能每个点位都分别定义LabelContent1和LabelContent2两个属性，所以只能另外想办法了。
我重新定义了一个类用来存每个点位的相关信息
using ESRI.ArcGIS.Client;
using ESRI.ArcGIS.Client.Symbols;
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.Markup;
using System.Windows.Media;
using System.Windows.Media.Imaging;
namespace ArcGISWpfMarkTest
{
class TestElement:Graphic
{
private string manName;
public string ManName
{
get { return manName; }
set { manName = value; }
}
private string phoneNo;
public string PhoneNo
{
get { return phoneNo; }
set { phoneNo = value; }
}
public TestElement()
{
}
public TestElement(string ManName,string PhoneNo)
{
this.ManName = ManName;
this.PhoneNo = PhoneNo;
ImageNormal = "pack://application:,,,/Source/Images/man32.png";
ImageSelected = "/Source/Images/man_selected32.png";
Symbol = GetMarkerSymbol() as Symbol;
}
public MarkerSymbol GetMarkerSymbol()
{
MarkerSymbol markerSymbol = new MarkerSymbol();
markerSymbol.OffsetX = 60;
markerSymbol.OffsetY = 72;
markerSymbol.ControlTemplate = GetControlTemplate();
return markerSymbol;
}
public string ImageNormal { get; set; }
public string ImageSelected { get; set; }
private ControlTemplate GetControlTemplate()
{
string template = "<ControlTemplate xmlns=‘http://schemas.microsoft.com/winfx/2006/xaml/presentation‘ xmlns:x=‘http://schemas.microsoft.com/winfx/2006/xaml‘><Grid><VisualStateManager.VisualStateGroups><VisualStateGroup x:Name=\\"SelectionStates\\"><VisualState x:Name=\\"Unselected\\" /><VisualState x:Name=\\"Selected\\"><Storyboard><ObjectAnimationUsingKeyFrames Storyboard.TargetProperty=\\"(UIElement.Visibility)\\" Storyboard.TargetName=\\"ImageNormal\\"><DiscreteObjectKeyFrame KeyTime=\\"0\\" Value=\\"{x:Static Visibility.Hidden}\\"/></ObjectAnimationUsingKeyFrames><ObjectAnimationUsingKeyFrames Storyboard.TargetProperty=\\"(UIElement.Visibility)\\" Storyboard.TargetName=\\"ImageSelected\\"><DiscreteObjectKeyFrame KeyTime=\\"0\\" Value=\\"{x:Static Visibility.Visible}\\"/></ObjectAnimationUsingKeyFrames></Storyboard></VisualState></VisualStateGroup></VisualStateManager.VisualStateGroups><Grid><Grid.RowDefinitions><RowDefinition Height=\\"0.2 * \\"></RowDefinition><RowDefinition Height=\\"0.2 * \\"></RowDefinition><RowDefinition Height=\\"0.8 * \\"></RowDefinition></Grid.RowDefinitions><Label Visibility=\\"Visible\\" Grid.Row=\\"0\\" BorderThickness=\\"0.5\\" BorderBrush=\\"White\\" HorizontalContentAlignment=\\"Center\\" Padding=\\"0\\" Margin=\\"0\\" Background=\\"" + "#2b5e93" + "\\" VerticalContentAlignment=\\"Center\\" Foreground=\\"White\\" Content=\\"" + ManName + "\\" Width=\\"" + "120" + "\\" Height=\\"" + "20" + "\\" FontSize=\\"" + "12" + "\\"/><Label Visibility=\\"Visible\\" Grid.Row=\\"1\\" BorderThickness=\\"0.5\\" BorderBrush=\\"White\\" HorizontalContentAlignment=\\"Center\\" Padding=\\"0\\" Margin=\\"0\\" Background=\\"" + "#2b5e93" + "\\" VerticalContentAlignment=\\"Center\\" Foreground=\\"White\\" Content=\\"" + PhoneNo + "\\" Width=\\"" + "120" + "\\" Height=\\"" + "20" + "\\" FontSize=\\"" + "12" + "\\"/><Image Name=\\"ImageNormal\\" Grid.Row=\\"2\\" Source=\\"" + ImageNormal + "\\" Visibility=\\"Visible\\"/><Image Name=\\"ImageSelected\\" Grid.Row=\\"2\\" Source=\\"" + ImageSelected + "\\" Visibility=\\"Hidden\\"/></Grid></Grid></ControlTemplate>";
var tem = XamlReader.Parse(template);
return tem as ControlTemplate;
}
}
}
这个TestElement类的关键思想是把xmal代码定义成字符串格式，然后这个字符串是依赖于TestElement类的自身属性而动态生成的，不同实例传入的属性不同，所以突破了xmal绑定机制的限制，可以成功的为每个点位传入不同的属性值了，这个xmal代码字符串通过以下代码成功转为ControlTemplate了。
var tem = XamlReader.Parse(template);
return tem as ControlTemplate;
以上做法有点违背wpf思想设计初衷，我也是没办法才如此做的，谁叫我的WPF技能不够高呢。。
在查找使用C#代码后台定义ControlTemplate的时候，发现这篇博文的方法也可行，只是再写布局的时候有些麻烦，我暂时还没有去实现
http://blog.csdn.net/zyloveyrf/article/details/6736844
还有一个问题总结：
在写Image的资源路径的时候遇到这样一个问题：
在Demo程序中这样定义Image的Resource可行
"pack://application:,,,/Source/Images/man32.png" 绝对路径
"/Source/Images/man_selected32.png" 相对路径
但是有时候上面的写法无效，非要下面的写法才行：
"pack://application:,,,/SDGPS_ManLayer;component/Source/Images/man32.png";
"pack://application:,,,/SDGPS_ManLayer;component/Source/Images/man_selected32.png";
这种情况发生在我的图层是单独编译成一个DLL，与MAP的主程序分离设计的。
我想可能是程序资源集引用的相关问题，以后再做研究。
WPF的Resource路径参考：
http://www.cnblogs.com/kushisei/p/5747708.html
https://msdn.microsoft.com/library/aa970069(v=vs.100).aspx
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