WF4:属性窗格PropertyGrid扩展

1.       我们有一个CaryActivity活动如下：

namespace CaryPropertyGridExten

{

    public sealed class CaryActivity : CodeActivity

    {       

        public InArgument<string> Text { get; set; }

        public double RepeatCount { get; set; }

        public string FileName { get; set; }          

        protected override void Execute(CodeActivityContext context)

        {                      

        }

    }

}

2.       上面活动有RepeatCount和FileName属性，我们会为这两个属性在属性窗格的设置自定义属性值编辑器，要达到效果如下图：

3.       分别定义两个属性对应的属性值编辑器如下：

namespace CaryPropertyGridExten

{

    class CustomInlineEditor : PropertyValueEditor

    { 

        public CustomInlineEditor()

        {

            this.InlineEditorTemplate = new DataTemplate(); 

            FrameworkElementFactory stack = new FrameworkElementFactory(typeof(StackPanel));

            FrameworkElementFactory slider = new FrameworkElementFactory(typeof(Slider));

            Binding sliderBinding = new Binding("Value");

            sliderBinding.Mode = BindingMode.TwoWay;

            slider.SetValue(Slider.MinimumProperty, 0.0);

            slider.SetValue(Slider.MaximumProperty, 100.0);

            slider.SetValue(Slider.ValueProperty, sliderBinding);

            stack.AppendChild(slider);

 

            FrameworkElementFactory textb = new FrameworkElementFactory(typeof(TextBox));

            Binding textBinding = new Binding("Value");

            textb.SetValue(TextBox.TextProperty, textBinding);

            textb.SetValue(TextBox.IsEnabledProperty, false);

 

            stack.AppendChild(textb);

            this.InlineEditorTemplate.VisualTree = stack;

        }

    }

}

 

namespace CaryPropertyGridExten

{

    class FilePickerEditor : DialogPropertyValueEditor

    {

        public FilePickerEditor()

        {

            this.InlineEditorTemplate = new DataTemplate(); 

            FrameworkElementFactory stack = new FrameworkElementFactory(typeof(StackPanel));

            stack.SetValue(StackPanel.OrientationProperty, Orientation.Horizontal);

            FrameworkElementFactory label = new FrameworkElementFactory(typeof(Label));

            Binding labelBinding = new Binding("Value");

            label.SetValue(Label.ContentProperty, labelBinding);

            label.SetValue(Label.MaxWidthProperty, 90.0);

 

            stack.AppendChild(label);

            FrameworkElementFactory editModeSwitch = new FrameworkElementFactory(typeof(EditModeSwitchButton));

            editModeSwitch.SetValue(EditModeSwitchButton.TargetEditModeProperty, PropertyContainerEditMode.Dialog);

            stack.AppendChild(editModeSwitch);

            this.InlineEditorTemplate.VisualTree = stack;

        }

 

        public override void ShowDialog(PropertyValue propertyValue, IInputElement commandSource)

        {

            Microsoft.Win32.OpenFileDialog ofd = new Microsoft.Win32.OpenFileDialog();

            if (ofd.ShowDialog() == true)

            {

                propertyValue.Value = ofd.FileName.Substring(ofd.FileName.LastIndexOf('\\') + 1);

            }

        }

    }

} 

4.       在CaryActivity的构造函数中增加自定义属性的信息如下，关于AttributeTableBuilder及MetadataStore的使用可参考关于元数据存储区MetadateStore及AttributeTableBuilder这篇文章。

  public CaryActivity()

        {

            AttributeTableBuilder builder = new AttributeTableBuilder();

            builder.AddCustomAttributes(typeof(CaryActivity), "RepeatCount", new EditorAttribute(typeof(CustomInlineEditor), typeof(PropertyValueEditor)));

            builder.AddCustomAttributes(typeof(CaryActivity), "FileName", new EditorAttribute(typeof(FilePickerEditor), typeof(DialogPropertyValueEditor)));

            MetadataStore.AddAttributeTable(builder.CreateTable());

        }  

 

例子来源：WF_WCF_Samples