Wpf自定义inkcanvas绑定 [英] Wpf custom inkcanvas binding

查看：102 发布时间：2019/6/10 17:56:06 C# WPF

本文介绍了Wpf自定义inkcanvas绑定的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在尝试将儿童收藏绑定到自定义Inkcanvas。在这一刻，程序从画布到代码绑定没有问题，但没有问题。

谢谢你的帮助

Petr

调试日志：

线程0x2c88已退出，代码为259（0x103）。 
'test_wpf.vshost.exe'（CLR v4.0.30319：test_wpf.vshost.exe）：已加载'C：\Users\petr.ehler \Documents\Visual Studio 2013 \Projects\test_wpf \test_wpf\bin\Debug\test_wpf.exe。符号已加载。 
'test_wpf.vshost.exe'（CLR v4.0.30319：test_wpf.vshost.exe）：已加载'C：\ Windows \ microsoft.Net \assembly \ GAC_MSIL \ System.Configuration \v4 .0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll。符号已加载。 
'test_wpf.vshost.exe'（CLR v4.0.30319：test_wpf.vshost.exe）：已加载'C：\ Windows \ Microsoft.Net \assembly \ GAC_MSIL \ PresentationFramework.Aero \v4 .0_4.0.0.0__31bf3856ad364e35\PresentationFramework.Aero.dll。符号已加载。 
 System.Windows.Data警告：56：为绑定创建BindingExpression（hash = 22226817）（hash = 54181020）
 System.Windows.Data警告：58：路径：'BorderItems'
系统.Windows.Data警告：61：BindingExpression（hash = 22226817）：默认更新触发器已解析为PropertyChanged 
 System.Windows.Data警告：62：BindingExpression（hash = 22226817）：附加到test_wpf.MyCanvas.Source（hash = 46367191）
 System.Windows.Data警告：67：BindingExpression（hash = 22226817）：解析源
 System.Windows.Data警告：70：BindingExpression（hash = 22226817）：找到数据上下文元素： MyCanvas（hash = 46367191）（OK）
 System.Windows.Data警告：71：BindingExpression（hash = 22226817）：DataContext为null 
 System.Windows.Data警告：65：BindingExpression（hash = 22226817 ）：解析源延迟
 System.Windows.Data警告：67：BindingExpression（hash = 22226817）：解析源
 System.Windows.Data警告：70：BindingExpression（hash = 22226） 817）：找到数据上下文元素：MyCanvas（hash = 46367191）（OK）
 System.Windows.Data警告：78：BindingExpression（hash = 22226817）：激活根项目MainWindow（hash = 3528959）
 System.Windows.Data警告：108：BindingExpression（hash = 22226817）：在0级 - 对于MainWindow.BorderItems找到存取器RuntimePropertyInfo（BorderItems）
 System.Windows.Data警告：104：BindingExpression（hash = 22226817） ：使用访问者RuntimePropertyInfo（BorderItems）替换级别0的项目（哈希= 3528959）
 System.Windows.Data警告：101：BindingExpression（哈希= 22226817）：来自MainWindow的级别0的GetValue（哈希= 3528959） ）使用RuntimePropertyInfo（BorderItems）：ObservableCollection`1（hash = 55866471 Count = 0）
 System.Windows.Data警告：80：BindingExpression（hash = 22226817）：TransferValue  - 得到原始值ObservableCollection`1（hash = 55866471） Count = 0）
 System.Windows.Data警告：89：BindingExpression（hash = 22226817）：TransferValue  - 使用final va lue ObservableCollection`1（hash = 55866471 Count = 0）
'test_wpf.vshost.exe'（CLR v4.0.30319：test_wpf.vshost.exe）：已加载'C：\ Windows \ Microsoft.Net \ assembly\GAC_MSIL\PresentationFramework-SystemXmlLinq\v4.0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemXmlLinq.dll。符号已加载。 
'test_wpf.vshost.exe'（CLR v4.0.30319：test_wpf.vshost.exe）：已加载'C：\ Windows \ Microsoft.Net \assembly \ GAC_MSIL \ PresentationFramework-SystemXml \v4 .0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemXml.dll。符号已加载。 
'test_wpf.vshost.exe'（CLR v4.0.30319：test_wpf.vshost.exe）：已加载'C：\ Windows \ Microsoft \\ net\assembly \ GAC_MSIL \ UIAutomationTypes \v4.0_4 .0.0.0__31bf3856ad364e35\UIAutomationTypes.dll。符号已加载。 
 System.Windows.Data警告：95：BindingExpression（hash = 22226817）：从MainWindow获得PropertyChanged事件（hash = 3528959）
 System.Windows.Data警告：101：BindingExpression（hash = 22226817）：使用RuntimePropertyInfo（BorderItems）从MainWindow（hash = 3528959）获取0级GetValue：ObservableCollection`1（hash = 55866471 Count = 1）
 System.Windows.Data警告：80：BindingExpression（hash = 22226817）：TransferValue  - 得到原始值ObservableCollection`1（hash = 55866471 Count = 1）
 System.Windows.Data警告：89：BindingExpression（hash = 22226817）：TransferValue  - 使用最终值ObservableCollection`1（hash = 55866471 Count = 1） 
'test_wpf.vshost.exe'（CLR v4.0.30319：test_wpf.vshost.exe）：已加载'C：\ Windows \ Microsoft.Net \assembly\GAC_MSIL \ PresentationFramework-SystemData \v4 .0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemData.dll。符号已加载。 
 System.Windows.Data警告：95：BindingExpression（hash = 22226817）：从MainWindow获得PropertyChanged事件（hash = 3528959）
 System.Windows.Data警告：101：BindingExpression（hash = 22226817）：使用RuntimePropertyInfo（BorderItems）从MainWindow（hash = 3528959）获取0级GetValue：ObservableCollection`1（hash = 55866471 Count = 1）
 System.Windows.Data警告：80：BindingExpression（hash = 22226817）：TransferValue  - 得到原始值ObservableCollection`1（hash = 55866471 Count = 1）
 System.Windows.Data警告：89：BindingExpression（hash = 22226817）：TransferValue  - 使用最终值ObservableCollection`1（hash = 55866471 Count = 1） 
 System.Windows.Data警告：95：BindingExpression（hash = 22226817）：从MainWindow获得PropertyChanged事件（hash = 3528959）
 System.Windows.Data警告：101：BindingExpression（hash = 22226817）：使用RuntimePropertyInfo（BorderItems）从MainWindow（hash = 3528959）获取0级GetValue：ObservableCollection`1（hash = 55866471 Count = 1）
 S ystem.Windows.Data警告：80：BindingExpression（hash = 22226817）：TransferValue  - 得到原始值ObservableCollection`1（hash = 55866471 Count = 1）
 System.Windows.Data警告：89：BindingExpression（hash = 22226817 ）：TransferValue  - 使用最终值ObservableCollection`1（hash = 55866471 Count = 1）
线程0x3784已退出，代码为259（0x103）。 
线程0x3050已退出，代码为259（0x103）。 
程序'[12308] test_wpf.vshost.exe'退出时代码为0（0x0）。

我尝试过：

主类

<前lang =c＃ > 使用系统;
使用 System.Collections.Generic;
使用 System.Collections.ObjectModel;
使用 System.Collections.Specialized;
使用 System.ComponentModel;
使用 System.Windows;
使用 System.Windows.Input;

命名空间 test_wpf
{
public partial class MainWindow：Window，INotifyPropertyChanged
{
public ObservableCollection< ItemDetail> BorderItems
{
get ;
set ;
}

public event PropertyChangedEventHandler PropertyChanged;

public MainWindow（）
{
InitializeComponent（）;
DataContext = this ;
BorderItems = new ObservableCollection< ItemDetail>（）;
}

private void Button_Click（ object sender，RoutedEventArgs e）
{
if （BorderItems.Count == 0 ）
{
return ;
}

BorderItems [ 0 ]。X = 200 ;
BorderItems [ 0 ]。Y = 300 ;
BorderItems [ 0 ]。宽度= 200 ;
BorderItems [ 0 ]。高度= 100 ;

if （PropertyChanged！= null ）
PropertyChanged（< span class =code-keyword> this ， new PropertyChangedEventArgs（ BorderItems））;
}

私有 void Button_Click_1（ object sender，RoutedEventArgs e）
{
ItemDetail d = new ItemDetail（）;
d.X = 100 ;
d.Y = 100 ;
d.Width = 100 ;
d.Height = 100 ;
d.Type = text;
d.Text = 测试 + BorderItems.Count.ToString（）;

BorderItems.Add（d）;

if （PropertyChanged！= null ）
PropertyChanged（< span class =code-keyword> this ， new PropertyChangedEventArgs（ BorderItems））;
}
}
}

MyCanvas

 使用系统; 
 使用 System.Collections.Generic; 
 使用 System.Collections.ObjectModel; 
 使用 System.Collections.Specialized; 
 使用 System.Linq; 
 使用 System.Text; 
 使用 System.Threading.Tasks; 
 使用 System.Windows; 
 使用 System.Windows.Controls; 
 使用 System.Windows.Data; 
 使用 System.Windows.Media; 
 
 命名空间 test_wpf 
 {
  public   class  MyCanvas：InkCanvas 
 {
  //  只是一个简单的INotifyCollectionChanged集合 
  public  ObservableCollection< ItemDetail>来源{获取;  set ; } 
 
  public   static   readonly  DependencyProperty SourceProperty = 
 DependencyProperty.Register（  Source，
  typeof （ObservableCollection< ItemDetail>），
  typeof （MyCanvas），
  new  FrameworkPropertyMetadata（ new  ObservableCollection< ItemDetail>（），
  new  PropertyChangedCallback（SourceChanged）））; 
 
  //  在设置新值时调用（例如通过绑定） 
 受保护 静态  void  SourceChanged（DependencyObject sender，DependencyPropertyChangedEventArgs args）
 {
  //  获取更改本地值 
  var  instance = sender  as  MyCanvas; 
  //  将要设置的新集合 
 ObservableCollection< ItemDetail> newCollection = args.NewValue  as  ObservableCollection< ItemDetail> ;; 
  //  已设置的上一个集合 
 ObservableCollection< ItemDetail> oldCollection = args.OldValue  as  ObservableCollection< ItemDetail> ;; 
 
  if （oldCollection！=  null ）
 {
  //  从旧集合中删除CollectionChangedEventHandler  
 oldCollection.CollectionChanged  -  =  new  NotifyCollectionChangedEventHandler（instance.collection_CollectionChanged）; 
} 
 
  //  清除集合中所有以前的子项 
 instance.Children.Clear（）; 
 
  if （newCollection！=  null ）
 {
  //  添加新集合的所有子项 
  foreach （ItemDetail item  in  newCollection）
 {
 AddControl（item，instance）; 
} 
 
  //  将新的CollectionChangedEventHandler添加到新集合 
 newCollection.CollectionChanged + =  new  NotifyCollectionChangedEventHandler（instance.collection_CollectionChanged）; 
 
} 
 
} 
 
 
  //  在集合中的项目发生更改时附加 
  protected   void  collection_CollectionChanged（ object  sender，System.Collections.Specialized.NotifyCollectionChangedEventArgs e）
 {
  //  在子集合中添加新项目 
  foreach （ItemDetail项目  e.NewItems）
 {
 AddControl（item）; 
} 
} 
 
 
 受保护 静态  void  AddControl（ItemDetail item，InkCanvas parentControl）
 {
 Border border =  new  Border（）; 
 
 border.DataContext = item; 
 border.Background =  new  SolidColorBrush（（Color）ColorConverter.ConvertFromString（ ＃000000\" ））; 
 
 border.Width = item.Width; 
 border.Height = item.Height; 
 
 
  if （item.Type ==   text）
 {
 TextBlock tb =  new  TextBlock（）; 
 tb.Foreground =  new  SolidColorBrush（（Color）ColorConverter.ConvertFromString（ ＃FFFFFF））; 
 tb.FontSize =  25 ; 
 tb.HorizontalAlignment = HorizontalAlignment.Center; 
 tb.VerticalAlignment = VerticalAlignment.Center; 
绑定TextBinding =  new 绑定（  Text ）; 
 TextBinding.Source = item; 
 TextBinding.Mode = BindingMode.TwoWay; 
 
 tb.SetBinding（TextBlock.TextProperty，TextBinding）; 
 
  //   tb.Text = item.Text;  
 border.Child = tb; 
} 
 
 
 parentControl.Children.Add（border）; 
 
 Binding XBinding =  new  Binding（  X）; 
 XBinding.Source = item; 
 XBinding.Mode = BindingMode.TwoWay; 
 
绑定YBinding =  new 绑定（  Y）; 
 YBinding.Source = item; 
 YBinding.Mode = BindingMode.TwoWay; 
 
 border.SizeChanged + = border_SizeChanged; 
 
 border.SetBinding（InkCanvas.LeftProperty，XBinding）; 
 border.SetBinding（InkCanvas.TopProperty，YBinding）; 
} 
 
  private   static   void  border_SizeChanged（ object  sender，SizeChangedEventArgs e）
 {
 Border border = sender  as 边框; 
  if （border ==  null ）
 {
  throw   new  ArgumentException（ 意外的对象。预期的边界）; 
} 
  var  i = border.DataContext; 
 ItemDetail itemDetail = i  as  ItemDetail; 
  if （itemDetail ==  null ）
 {
  throw   new  ArgumentException（ 意外的对象。预期的ItemDetail）; 
} 
 itemDetail.Width = border.ActualWidth; 
 itemDetail.Height = border.ActualHeight; 
} 
 
 受保护  void  AddControl（ItemDetail item）
 {
 AddControl（item， this ）; 
} 
 
 
 静态 MyCanvas（）
 {
 DefaultStyleKeyProperty.OverrideMetadata（ typeof （MyCanvas）， new  FrameworkPropertyMetadata（ typeof （ MyCanvas）））; 
} 
 
  public  MyCanvas（）
： base （）
 {
 
} 
} 
}

项目明细

 使用系统; 
 使用 System.Collections.Generic; 
 使用 System.ComponentModel; 
 使用 System.Linq; 
 使用 System.Text; 
 使用 System.Windows.Controls; 
 
 命名空间 test_wpf 
 {
 
  public   class  ItemDetail：INotifyPropertyChanged 
 {
  public   event  PropertyChangedEventHandler PropertyChanged; 
 
  public   int  X {获得;  set ; } 
  public   int  Y { get ;  set ; } 
  public   double 宽度{ get ;  set ; } 
  public   double 高度{ get ;  set ; } 
  public   string 输入{ get ;  set ; } 
  public   string 文字{ get ;  set ; } 
} 
}

MainClassWPF

 <  窗口    x：Class   =  test_wpf.MainWindow   
   
           xmlns   =  http://schemas.microsoft.com/winfx/2006 / xaml / presentation  
   
           xmlns：x   =  http://schemas.microsoft.com/winfx/ 2006 / xaml  
   
           xmlns：src   =  clr-namespace：test_wpf  
   
          标题  =  InkCanvasElementSelection  
   
           ResizeMode   =  CanResize  
   
           xmlns：ComponentModel   =  clr-namespace：System.ComponentModel; assembly = WindowsBase  
   
          高度 < span class =code-keyword> =  800   宽度  =  600 >  
 
 <   DockPanel     LastChildFill   =  True >  
 < span class =code-keyword><   StackPanel     DockPanel.Dock   = 左   宽度  =  200    方向  = 垂直 >  
 <  行   保证金  =  5  /  >  
 <   TextBlock  > 创建新元素<   / TextBlock  >  
 <  按钮   点击  =  Button_Click_1   高度  =  20   内容  =  新  /  >  
 <  行   保证金  =  5  /  >  
 <   TextBlock  > 更改元素0 <   / TextBlock  >  
 <  按钮   单击  =  Button_Click   高度  =  20   内容  = 更改  /  >  
 <   / StackPanel  >  
 <   src：MyCanvas    来源  =  {Binding Path = BorderItems，Mode = TwoWay}   背景 < span class =code-keyword> =  AliceBlue    EditingMode   = 选择  /  >  
 <   / DockPanel  >  
 <   / Window  >

~~解决方案~~

解决方案非常简单。 Inkcanvas不知道ItemDetail类的变化。 ItemDetail类无法观察到。只需更新类如

public class ItemDetail：INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;

private void NotifyPropertyChanged（ String propertyName）
{
PropertyChangedEventHandler handler = PropertyChanged;
if （ null ！= handler）
{
handler（ this ， new PropertyChangedEventArgs（propertyName））;
}
}

private int _x;
private int _y;
private double _width;
private double _height;
private string _type;
private string _text;

public int X {
get { return _x; }
set {_ x = value ; NotifyPropertyChanged(\"X\"); }
}

public int Y
{
get { return _y; }
set { _y = value; NotifyPropertyChanged(\"Y\"); }
}

public double Width
{
get { return _width; }
set { _width = value; NotifyPropertyChanged(\"Width\"); }
}

public double Height
{
get { return _height; }
set { _height = value; NotifyPropertyChanged(\"Height\"); }
}

public string Type
{
get { return _type; }
set { _type = value; NotifyPropertyChanged(\"Type\"); }
}
public string Text
{
get { return _text; }
set { _text = value; NotifyPropertyChanged(\"Text\"); }
}

}

and the code is functional.

Petr

Hi,
I am trying to Bind Children collection to Custom Inkcanvas. In this moment program binds from canvas to code without problem, but not othreside.
Thank you for help
Petr

Debug Log:

The thread 0x2c88 has exited with code 259 (0x103).
'test_wpf.vshost.exe' (CLR v4.0.30319: test_wpf.vshost.exe): Loaded 'C:\Users\petr.ehler\Documents\Visual Studio 2013\Projects\test_wpf\test_wpf\bin\Debug\test_wpf.exe'. Symbols loaded.
'test_wpf.vshost.exe' (CLR v4.0.30319: test_wpf.vshost.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll'. Symbols loaded.
'test_wpf.vshost.exe' (CLR v4.0.30319: test_wpf.vshost.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework.Aero\v4.0_4.0.0.0__31bf3856ad364e35\PresentationFramework.Aero.dll'. Symbols loaded.
System.Windows.Data Warning: 56 : Created BindingExpression (hash=22226817) for Binding (hash=54181020)
System.Windows.Data Warning: 58 :   Path: 'BorderItems'
System.Windows.Data Warning: 61 : BindingExpression (hash=22226817): Default update trigger resolved to PropertyChanged
System.Windows.Data Warning: 62 : BindingExpression (hash=22226817): Attach to test_wpf.MyCanvas.Source (hash=46367191)
System.Windows.Data Warning: 67 : BindingExpression (hash=22226817): Resolving source 
System.Windows.Data Warning: 70 : BindingExpression (hash=22226817): Found data context element: MyCanvas (hash=46367191) (OK)
System.Windows.Data Warning: 71 : BindingExpression (hash=22226817): DataContext is null
System.Windows.Data Warning: 65 : BindingExpression (hash=22226817): Resolve source deferred
System.Windows.Data Warning: 67 : BindingExpression (hash=22226817): Resolving source 
System.Windows.Data Warning: 70 : BindingExpression (hash=22226817): Found data context element: MyCanvas (hash=46367191) (OK)
System.Windows.Data Warning: 78 : BindingExpression (hash=22226817): Activate with root item MainWindow (hash=3528959)
System.Windows.Data Warning: 108 : BindingExpression (hash=22226817):   At level 0 - for MainWindow.BorderItems found accessor RuntimePropertyInfo(BorderItems)
System.Windows.Data Warning: 104 : BindingExpression (hash=22226817): Replace item at level 0 with MainWindow (hash=3528959), using accessor RuntimePropertyInfo(BorderItems)
System.Windows.Data Warning: 101 : BindingExpression (hash=22226817): GetValue at level 0 from MainWindow (hash=3528959) using RuntimePropertyInfo(BorderItems): ObservableCollection`1 (hash=55866471 Count=0)
System.Windows.Data Warning: 80 : BindingExpression (hash=22226817): TransferValue - got raw value ObservableCollection`1 (hash=55866471 Count=0)
System.Windows.Data Warning: 89 : BindingExpression (hash=22226817): TransferValue - using final value ObservableCollection`1 (hash=55866471 Count=0)
'test_wpf.vshost.exe' (CLR v4.0.30319: test_wpf.vshost.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework-SystemXmlLinq\v4.0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemXmlLinq.dll'. Symbols loaded.
'test_wpf.vshost.exe' (CLR v4.0.30319: test_wpf.vshost.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework-SystemXml\v4.0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemXml.dll'. Symbols loaded.
'test_wpf.vshost.exe' (CLR v4.0.30319: test_wpf.vshost.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\UIAutomationTypes\v4.0_4.0.0.0__31bf3856ad364e35\UIAutomationTypes.dll'. Symbols loaded.
System.Windows.Data Warning: 95 : BindingExpression (hash=22226817): Got PropertyChanged event from MainWindow (hash=3528959)
System.Windows.Data Warning: 101 : BindingExpression (hash=22226817): GetValue at level 0 from MainWindow (hash=3528959) using RuntimePropertyInfo(BorderItems): ObservableCollection`1 (hash=55866471 Count=1)
System.Windows.Data Warning: 80 : BindingExpression (hash=22226817): TransferValue - got raw value ObservableCollection`1 (hash=55866471 Count=1)
System.Windows.Data Warning: 89 : BindingExpression (hash=22226817): TransferValue - using final value ObservableCollection`1 (hash=55866471 Count=1)
'test_wpf.vshost.exe' (CLR v4.0.30319: test_wpf.vshost.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework-SystemData\v4.0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemData.dll'. Symbols loaded.
System.Windows.Data Warning: 95 : BindingExpression (hash=22226817): Got PropertyChanged event from MainWindow (hash=3528959)
System.Windows.Data Warning: 101 : BindingExpression (hash=22226817): GetValue at level 0 from MainWindow (hash=3528959) using RuntimePropertyInfo(BorderItems): ObservableCollection`1 (hash=55866471 Count=1)
System.Windows.Data Warning: 80 : BindingExpression (hash=22226817): TransferValue - got raw value ObservableCollection`1 (hash=55866471 Count=1)
System.Windows.Data Warning: 89 : BindingExpression (hash=22226817): TransferValue - using final value ObservableCollection`1 (hash=55866471 Count=1)
System.Windows.Data Warning: 95 : BindingExpression (hash=22226817): Got PropertyChanged event from MainWindow (hash=3528959)
System.Windows.Data Warning: 101 : BindingExpression (hash=22226817): GetValue at level 0 from MainWindow (hash=3528959) using RuntimePropertyInfo(BorderItems): ObservableCollection`1 (hash=55866471 Count=1)
System.Windows.Data Warning: 80 : BindingExpression (hash=22226817): TransferValue - got raw value ObservableCollection`1 (hash=55866471 Count=1)
System.Windows.Data Warning: 89 : BindingExpression (hash=22226817): TransferValue - using final value ObservableCollection`1 (hash=55866471 Count=1)
The thread 0x3784 has exited with code 259 (0x103).
The thread 0x3050 has exited with code 259 (0x103).
The program '[12308] test_wpf.vshost.exe' has exited with code 0 (0x0).

What I have tried:

Main Class

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Windows;
using System.Windows.Input;

namespace test_wpf
{
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        public ObservableCollection<ItemDetail> BorderItems
        {
            get;
            set;
        }

        public event PropertyChangedEventHandler PropertyChanged;

        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
            BorderItems = new ObservableCollection<ItemDetail>();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if(BorderItems.Count == 0)
            {
                return;
            }

            BorderItems[0].X = 200;
            BorderItems[0].Y = 300;
            BorderItems[0].Width = 200;
            BorderItems[0].Height = 100;

            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs("BorderItems"));
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            ItemDetail d = new ItemDetail();
            d.X = 100;
            d.Y = 100;
            d.Width = 100;
            d.Height = 100;
            d.Type = "text";
            d.Text = "Test "+BorderItems.Count.ToString();

            BorderItems.Add(d);

            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs("BorderItems"));
        }
    }
}

~~MyCanvas~~

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Media;

namespace test_wpf
{
    public class MyCanvas : InkCanvas
    {
        //Just a simple INotifyCollectionChanged collection
        public ObservableCollection<ItemDetail> Source { get; set; }

        public static readonly DependencyProperty SourceProperty =
            DependencyProperty.Register("Source",
            typeof(ObservableCollection<ItemDetail>),
            typeof(MyCanvas),
            new FrameworkPropertyMetadata(new ObservableCollection<ItemDetail>(),
            new PropertyChangedCallback(SourceChanged)));

        //called when a new value is set (through binding for example)
        protected static void SourceChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
        {
            //gets the instance that changed the "local" value
            var instance = sender as MyCanvas;
            //the new collection that will be set
            ObservableCollection<ItemDetail> newCollection = args.NewValue as ObservableCollection<ItemDetail>;
            //the previous collection that was set
            ObservableCollection<ItemDetail> oldCollection = args.OldValue as ObservableCollection<ItemDetail>;

            if (oldCollection != null)
            {
                //removes the CollectionChangedEventHandler from the old collection
                oldCollection.CollectionChanged -= new NotifyCollectionChangedEventHandler(instance.collection_CollectionChanged);
            }

            //clears all the previous children in the collection
            instance.Children.Clear();

            if (newCollection != null)
            {
                //adds all the children of the new collection
                foreach (ItemDetail item in newCollection)
                {
                    AddControl(item, instance);
                }

                //adds a new CollectionChangedEventHandler to the new collection
                newCollection.CollectionChanged += new NotifyCollectionChangedEventHandler(instance.collection_CollectionChanged);

            }

        }


        //append when an Item in the collection is changed
        protected void collection_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
        {
            //adds the new items in the children collection
            foreach (ItemDetail item in e.NewItems)
            {
                AddControl(item);
            }
        }


        protected static void AddControl(ItemDetail item, InkCanvas parentControl)
        {
            Border border = new Border();

            border.DataContext = item;
            border.Background = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#000000"));

            border.Width = item.Width;
            border.Height = item.Height;

            
            if(item.Type == "text")
            {
                TextBlock tb = new TextBlock();
                tb.Foreground = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#FFFFFF"));
                tb.FontSize = 25;
                tb.HorizontalAlignment = HorizontalAlignment.Center;
                tb.VerticalAlignment = VerticalAlignment.Center;
                Binding TextBinding = new Binding("Text");
                TextBinding.Source = item;
                TextBinding.Mode = BindingMode.TwoWay;

                tb.SetBinding(TextBlock.TextProperty, TextBinding);

                //tb.Text = item.Text;
                border.Child = tb;
            }
             

            parentControl.Children.Add(border);

            Binding XBinding = new Binding("X");
            XBinding.Source = item;
            XBinding.Mode = BindingMode.TwoWay;

            Binding YBinding = new Binding("Y");
            YBinding.Source = item;
            YBinding.Mode = BindingMode.TwoWay;

            border.SizeChanged += border_SizeChanged;

            border.SetBinding(InkCanvas.LeftProperty, XBinding);
            border.SetBinding(InkCanvas.TopProperty, YBinding);
        }

        private static void border_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            Border border = sender as Border;
            if (border == null)
            {
                throw new ArgumentException("Unexpected object. Expected border");
            }
            var i = border.DataContext;
            ItemDetail itemDetail = i as ItemDetail;
            if (itemDetail == null)
            {
                throw new ArgumentException("Unexpected object. Expected ItemDetail");
            }
            itemDetail.Width = border.ActualWidth;
            itemDetail.Height = border.ActualHeight;
        }

        protected void AddControl(ItemDetail item)
        {
            AddControl(item, this);
        }


        static MyCanvas()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(MyCanvas), new FrameworkPropertyMetadata(typeof(MyCanvas)));
        }

        public MyCanvas()
            : base()
        {

        }
    }
}

~~Item detail~~

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Windows.Controls;

namespace test_wpf
{
    
    public class ItemDetail: INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        public int X { get; set; }
        public int Y { get; set; }
        public double Width { get; set; }
        public double Height { get; set; }
        public string Type { get; set; }
        public string Text { get; set; }
    }
}

~~MainClassWPF~~

<Window x:Class="test_wpf.MainWindow"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    xmlns:src="clr-namespace:test_wpf"

    Title="InkCanvasElementSelection"

    ResizeMode="CanResize"

    xmlns:ComponentModel="clr-namespace:System.ComponentModel;assembly=WindowsBase"

    Height="800" Width="600">
    
    <DockPanel LastChildFill="True">
        <StackPanel DockPanel.Dock="Left" Width="200" Orientation="Vertical">
            <Line Margin="5"/>
            <TextBlock>Create new Element</TextBlock>
            <Button Click="Button_Click_1" Height="20" Content="New"/>
            <Line Margin="5"/>
            <TextBlock>Change Element 0</TextBlock>
            <Button Click="Button_Click" Height="20" Content="Change"/>
        </StackPanel>
        <src:MyCanvas Source="{Binding Path=BorderItems, Mode=TwoWay}" Background="AliceBlue" EditingMode="Select"/>
    </DockPanel>
</Window>

~~解决方案~~

Hi,
solution was quite simple. Inkcanvas did not know about changes in ItemDetail class. The class ItemDetail was not observable. Just update class like

public class ItemDetail: INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; private void NotifyPropertyChanged(String propertyName) { PropertyChangedEventHandler handler = PropertyChanged; if (null != handler) { handler(this, new PropertyChangedEventArgs(propertyName)); } } private int _x; private int _y; private double _width; private double _height; private string _type; private string _text; public int X { get { return _x; } set { _x = value; NotifyPropertyChanged("X"); } } public int Y { get { return _y; } set { _y = value; NotifyPropertyChanged("Y"); } } public double Width { get { return _width; } set { _width = value; NotifyPropertyChanged("Width"); } } public double Height { get { return _height; } set { _height = value; NotifyPropertyChanged("Height"); } } public string Type { get { return _type; } set { _type = value; NotifyPropertyChanged("Type"); } } public string Text { get { return _text; } set { _text = value; NotifyPropertyChanged("Text"); } } }

and the code is functional.

Petr

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Wpf自定义inkcanvas绑定 [英] Wpf custom inkcanvas binding

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Wpf自定义inkcanvas绑定 [英] Wpf custom inkcanvas binding

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