silverlight MenuItem 二级菜单

概述在SL里用ContextMenu和MenuItem可以组成菜单项。但是在给MenuItem添加二级菜单的时候就会报错---"方法或 *** 作未实现"。 在网上找到一篇文章，解决了这个问题  原文地址：http://www.cnblogs.com/tanliang/archive/2011/11/25/2263342.html 细看了一下解决办法，是继承了MenuItem控件并在模板里添加了ItemsPr

在SL里用ContextMenu和MenuItem可以组成菜单项。但是在给MenuItem添加二级菜单的时候就会报错---"方法或 *** 作未实现"。

在网上找到一篇文章，解决了这个问题  原文地址：http://www.cnblogs.com/tanliang/archive/2011/11/25/2263342.html

细看了一下解决办法，是继承了MenuItem控件并在模板里添加了ItemsPresenter，我去~  MenuItem不是有Items属性吗,为毛原先没有ItemsPresenter啊!!!这不神经吗..........

 代码备份如下：

新建模版化控件SuperMenuItem：

SuperMenuItemusing System;using System.Collections.Specialized;using System.windows;using System.windows.Controls;using System.windows.Controls.Primitives;using System.windows.input;namespace Demo{    public class SuperMenuItem : MenuItem    {        #region FIElds        private Popup popup;        public bool CanLeave { get; set; }        #endregion        #region PropertIEs        public Visibility HasSubItems        {            get { return (Visibility)GetValue(HasSubItemsProperty); }            set { SetValue(HasSubItemsProperty,value); }        }        public static Readonly DependencyProperty HasSubItemsProperty =            DependencyProperty.Register("HasSubItems",typeof(Visibility),typeof(SuperMenuItem),new PropertyMetadata(Visibility.Collapsed));        public bool IsSubmenuOpen        {            get { return (bool)GetValue(IsSubmenuOpenProperty); }            set { SetValue(IsSubmenuOpenProperty,value); }        }        public static Readonly DependencyProperty IsSubmenuOpenProperty =            DependencyProperty.Register("IsSubmenuOpen",typeof(bool),new PropertyMetadata(false));        #endregion        #region Constructor        public SuperMenuItem()        {            this.DefaultStyleKey = typeof(SuperMenuItem);            this.MouseEnter += new MouseEventHandler(parent_MouseEnter);            this.MouseLeave += new MouseEventHandler(SuperMenuItem_MouseLeave);            this.Click += new RoutedEventHandler(SuperMenuItem_Click);            this.CanLeave = true;        }        private voID SuperMenuItem_Click(object sender,RoutedEventArgs e)        {            if (this.Parent != null && this.Parent is SuperMenuItem)            {                (this.Parent as SuperMenuItem).OnClick();            }        }        public overrIDe voID OnApplyTemplate()        {            base.OnApplyTemplate();            popup = (Popup)this.GetTemplateChild("PART_Popup");            popup.Opened += new EventHandler(popup_Opened);            popup.Closed += new EventHandler(popup_Closed);        }        private voID popup_Opened(object sender,EventArgs e)        {            this.CanLeave = false;        }        private voID popup_Closed(object sender,EventArgs e)        {            if (this.HasSubItems == Visibility.Visible)            {                this.IsSubmenuOpen = false;            }        }        protected overrIDe voID OnItemsChanged(NotifyCollectionChangedEventArgs e)        {            if (e.NewItems != null)            {                if (e.NewItems.Count > 0)                {                    this.HasSubItems = Visibility.Visible;                }            }        }        private voID parent_MouseEnter(object sender,MouseEventArgs e)        {            this.CanLeave = true;            if (this.HasSubItems == Visibility.Visible)            {                this.IsSubmenuOpen = true;            }            if (this.Parent != null && this.Parent is ContextMenu)            {                foreach (var item in (this.Parent as ContextMenu).Items)                {                    if (item != this)                    {                        (item as SuperMenuItem).IsSubmenuOpen = false;                    }                }            }        }        private voID SuperMenuItem_MouseLeave(object sender,MouseEventArgs e)        {            if (this.HasSubItems == Visibility.Visible)            {                if (CanLeave)                {                    this.IsSubmenuOpen = false;                }            }        }        #endregion    }}

对应样式：

<Style targettype="local:SuperMenuItem">            <Setter Property="Background" Value="transparent"/>            <Setter Property="borderBrush" Value="transparent"/>            <Setter Property="padding" Value="4,3,2,3"/>            <Setter Property="Template">                <Setter.Value>                    <ControlTemplate targettype="local:SuperMenuItem">                        <GrID>                            <visualstatemanager.VisualStateGroups>                                <VisualStateGroup x:name="CommonStates">                                    <VisualState x:name="normal"/>                                    <VisualState x:name="Disabled">                                        <Storyboard>                                            <DoubleAnimation Duration="0" To="0.5" Storyboard.TargetProperty="Opacity" Storyboard.Targetname="Presenter"/>                                        </Storyboard>                                    </VisualState>                                </VisualStateGroup>                                <VisualStateGroup x:name="Focusstates">                                    <VisualState x:name="Unfocused"/>                                    <VisualState x:name="Focused">                                        <Storyboard>                                            <DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.Targetname="Bg"/>                                            <colorAnimation Duration="0" To="#40FFFFFF" Storyboard.TargetProperty="(Shape.stroke).(SolIDcolorBrush.color)" Storyboard.Targetname="Innerborder"/>                                        </Storyboard>                                    </VisualState>                                </VisualStateGroup>                            </visualstatemanager.VisualStateGroups>                            <Rectangle Fill="{TemplateBinding Background}" RadiusY="2" RadiusX="2" stroke="{TemplateBinding borderBrush}" strokeThickness="1"/>                            <Rectangle x:name="Bg" Opacity="0" RadiusY="2" RadiusX="2" stroke="#8071CBF1" strokeThickness="1">                                <Rectangle.Fill>                                    <linearGradIEntBrush EndPoint="0,1" StartPoint="0,0">                                        <GradIEntStop color="#34C5EBFF" Offset="0"/>                                        <GradIEntStop color="#3481D8FF" Offset="1"/>                                    </linearGradIEntBrush>                                </Rectangle.Fill>                            </Rectangle>                            <Rectangle x:name="Innerborder" margin="1" RadiusY="2" RadiusX="2" stroke="transparent"/>                            <GrID>                                <GrID.ColumnDeFinitions>                                    <ColumnDeFinition MinWIDth="24" WIDth="auto"/>                                    <ColumnDeFinition WIDth="4"/>                                    <ColumnDeFinition WIDth="*"/>                                    <ColumnDeFinition WIDth="17"/>                                </GrID.ColumnDeFinitions>                                <ContentPresenter Content="{TemplateBinding Icon}" margin="1" VerticalAlignment="Center"/>                                <ContentPresenter x:name="Presenter" ContentTemplate="{TemplateBinding headerTemplate}"                                                  Content="{TemplateBinding header}" GrID.Column="2" margin="{TemplateBinding padding}"/>                                <Path GrID.Column="3" Data="M 0,0 L 4,3.5 L 0,7 Z" Fill="Black"                                      margin="4,0" VerticalAlignment="Center" Visibility="{TemplateBinding HasSubItems}"/>                                <!--<Path x:name="Glyph" Data="M 0,5.1 L 1.7,5.2 L 3.4,7.1 L 8,0.4 L 9.2,0 L 3.3,10.8 Z"                                  Fill="#0C12A1" FlowDirection="leftToRight" Height="11" WIDth="9"/>-->                            </GrID>                            <Popup x:name="PART_Popup" HorizontalOffset="{TemplateBinding ActualWIDth}"                                   IsOpen="{TemplateBinding IsSubmenuOpen}" margin="-4,0">                                <ContentControl x:name="SubMenuborder">                                    <ContentControl.Template>                                        <ControlTemplate>                                            <GrID Background="#FFF5F5F5">                                                <Rectangle Fill="#F1F1F1" HorizontalAlignment="left" RadiusY="2" RadiusX="2" WIDth="28"/>                                                <Rectangle Fill="#E2E3E3" HorizontalAlignment="left" WIDth="1" margin="30,0"/>                                                <Rectangle Fill="White" HorizontalAlignment="left" WIDth="1" margin="31,0"/>                                                <ContentPresenter GrID.ColumnSpan="2" margin="1,0"/>                                            </GrID>                                        </ControlTemplate>                                    </ContentControl.Template>                                    <ScrollVIEwer x:name="SubMenuScrollVIEwer" VerticalScrollbarVisibility="auto" padding="0">                                        <GrID>                                            <Canvas HorizontalAlignment="left" Height="0" VerticalAlignment="top" WIDth="0">                                                <Rectangle Fill="#FFF5F5F5" Height="{Binding ActualHeight,Elementname=SubMenuborder}"                                                           WIDth="{Binding ActualWIDth,Elementname=SubMenuborder}"/>                                            </Canvas>                                            <ItemsPresenter x:name="ItemsPresenter" margin="2"/>                                        </GrID>                                    </ScrollVIEwer>                                </ContentControl>                            </Popup>                        </GrID>                    </ControlTemplate>                </Setter.Value>            </Setter>        </Style>

用法不写了，看原文吧。总之，有子菜单的菜单项就用这个SuperMenuItem，没有的话就随便了。 总结

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