在ControlTemplate中的圖像源WPF

Question

我有一個ControlTemplate是用於按鈕控件，在ControlTemplate中我有用於顯示在按鈕中的圖像控件，現在我想設置圖像源在小時候，因爲我必須複製粘貼每個按鈕的ControlTemplate爲新按鈕設置新圖像。

在此先感謝。

Answer 1

也許這是你在找什麼：

• http://www.hardcodet.net/2009/01/create-wpf-image-button-through-attached-properties
• http://blogs.msdn.com/knom/archive/2007/10/31/wpf-control-development-3-ways-to-build-an-imagebutton.aspx
• http://social.msdn.microsoft.com/Forums/en-US/vswpfdesigner/thread/8ba13699-7f7f-4ab6-8e3e-f7d787355d81

希望這有助於。
問候，
米希爾Gokani

Answer 2

一般來說有可以設置在運行時的圖像源兩種方式（下面的代碼示例是用僞代碼，並且不會編譯）：

1）在XAML使用的，其中源結合結合將是一個包含圖像源（這是該方案Slugster在談論）一些對象的屬性：

這將是你的對象：

public class ViewModel 
{ 
    public string ImageURI {get;set;} 
} 

，並通過XAML，你有你的按鈕呈現圖像和圖像源是se通過結合T：

<Image Source="{Binding Source=ViewModel; Path=ImageURI}"/> 

2）通過設置從代碼隱藏圖像源。

這將是您的XAML，你有按鈕，圖像：

<Image x:Name="theImage"/> 

，並在代碼隱藏您設置圖像的來源：

theImage.Source = new BitmapImage(new Uri("yor image uri")); 

Answer 3

您可以訪問一個項目從模板內部通過使用GetTemplateChild(string childName)方法（使用XAML中定義的元素名稱），例如 - 如果您的圖像是這樣定義的：

<Image x:Name="MyImage" Stretch="Fill" /> 

那麼你會調用這個方法是這樣的：

Image myImage = GetTemplateChild("MyImage") as Image; 

if (myImage != null) 
{ 
    myImage.Source = "/Images/MyPicture.jpg"; 
} 

注意：您將無法使用此方法，直到後OnApplyTemplate一直呼籲控制。

Answer 4

<Button x:Class="FunitureCtlLib.PressedImageButton" 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Name="uc"><!--MinHeight="25" MinWidth="50"--> 
<Button.Template> 
    <ControlTemplate> 
     <Grid> 
      <Image Name="imgDefault" Source="{Binding Path=DefaultImageSource,ElementName=uc}" Stretch="{Binding Path=ImageStretch,ElementName=uc}"></Image> 
      <ContentPresenter Content="{TemplateBinding Property=ContentControl.Content}" /> 
     </Grid> 
     <ControlTemplate.Triggers> 
      <Trigger Property="Button.IsPressed" Value="True"> 
       <Setter Property="Image.Source" TargetName="imgDefault" Value="{Binding Path=PressedImageSource,ElementName=uc}"></Setter> 
       <Setter Property="UIElement.Effect"> 
        <Setter.Value> 
         <DropShadowEffect BlurRadius="10" Color="Black" Direction="0" Opacity="0.6" RenderingBias="Performance" ShadowDepth="0" /> 
        </Setter.Value> 
       </Setter> 
      </Trigger> 
      <Trigger Property="Button.IsMouseOver" Value="True"> 
       <Setter Property="UIElement.Effect"> 
        <Setter.Value> 
         <DropShadowEffect BlurRadius="10" Color="White" Direction="0" Opacity="0.6" RenderingBias="Performance" ShadowDepth="0" /> 
        </Setter.Value> 
       </Setter> 
      </Trigger> 
     </ControlTemplate.Triggers> 
    </ControlTemplate> 
</Button.Template> 

/// <summary> 
/// ImageButton.xaml 
/// </summary> 
public partial class PressedImageButton : Button 
{ 

    #region dependency property 

    public static readonly DependencyProperty DefaultImageSourceProperty = DependencyProperty.Register("DefaultImageSource", typeof(ImageSource), typeof(PressedImageButton), new PropertyMetadata(null, new PropertyChangedCallback(DefaultImageSourceChangedCallback))); 
    public static readonly DependencyProperty PressedImageSourceProperty = DependencyProperty.Register("PressedImageSource", typeof(ImageSource), typeof(PressedImageButton), new PropertyMetadata(null, new PropertyChangedCallback(PressedImageSourceChangedCallback))); 
    public static readonly DependencyProperty ImageStretchProperty = DependencyProperty.Register("ImageStretch", typeof(Stretch), typeof(PressedImageButton), new PropertyMetadata(Stretch.None, new PropertyChangedCallback(ImageStretchChangedCallback))); 

    #endregion  

    #region callback 

    private static void DefaultImageSourceChangedCallback(object sender, DependencyPropertyChangedEventArgs e) 
    { 
     if (sender != null && sender is PressedImageButton) 
     { 
      PressedImageButton imgbtn = sender as PressedImageButton; 
      imgbtn.OnDefaultImageSourceChanged(e.OldValue, e.NewValue); 
     } 
    } 

    private static void PressedImageSourceChangedCallback(object sender, DependencyPropertyChangedEventArgs e) 
    { 
     if (sender != null && sender is PressedImageButton) 
     { 
      PressedImageButton imgbtn = sender as PressedImageButton; 
      imgbtn.OnPressedImageSourceChanged(e.OldValue, e.NewValue); 
     } 
    } 

    private static void ImageStretchChangedCallback(object sender, DependencyPropertyChangedEventArgs e) 
    { 
     if (sender != null && sender is PressedImageButton) 
     { 
      PressedImageButton imgbtn = sender as PressedImageButton; 
      imgbtn.OnImageStretchChanged(e.OldValue, e.NewValue); 
     } 
    } 

    #endregion 

    #region public property 

    /// <summary> 
    /// 
    /// </summary> 
    public ImageSource DefaultImageSource 
    { 
     get 
     { 
      return this.GetValue(DefaultImageSourceProperty) as ImageSource; 
     } 
     set 
     { 
      this.SetValue(DefaultImageSourceProperty, value); 
     } 
    } 

    /// <summary> 
    /// 
    /// </summary> 
    public ImageSource PressedImageSource 
    { 
     get 
     { 
      return this.GetValue(PressedImageSourceProperty) as ImageSource; 
     } 
     set 
     { 
      this.SetValue(PressedImageSourceProperty, value); 
     } 
    } 

    /// <summary> 
    /// 
    /// </summary> 
    public Stretch ImageStretch 
    { 
     get 
     { 
      return (Stretch)this.GetValue(ImageStretchProperty); 
     } 
     set 
     { 
      this.SetValue(ImageStretchProperty, value); 
     } 
    }  

    #endregion   

    #region protected method 

    protected void OnDefaultImageSourceChanged(object oldValue, object newValue) 
    { 
     //viewmodel.DefaultImageSource = newValue as ImageSource; 
     this.DefaultImageSource = newValue as ImageSource; 
    } 

    protected void OnPressedImageSourceChanged(object oldValue, object newValue) 
    { 
     //viewmodel.PressedImageSource = newValue as ImageSource; 
     this.PressedImageSource = newValue as ImageSource; 
    } 

    protected void OnImageStretchChanged(object oldValue, object newValue) 
    { 
     //viewmodel.ImageStretch = (Stretch)newValue; 
     this.ImageStretch = (Stretch)newValue; 
    } 

    #endregion 

    #region construct 

    public PressedImageButton() 
    { 
     InitializeComponent(); 
     this.Loaded += new RoutedEventHandler(PressedImageButton_Loaded); 
    } 

    #endregion 

    #region private event 

    void PressedImageButton_Loaded(object sender, RoutedEventArgs e) 
    { 

    }  

    #endregion 
}