在上一篇中我們完成了快捷工具欄的開發(fā)，本篇將講解應(yīng)用程序菜單開發(fā)的相關(guān)內(nèi)容。如下圖所示，點(diǎn)擊程序窗口左上角的記事本圖標(biāo)（Application Button）會顯示出應(yīng)用程序菜單（Application Menu）列表，列表中的按鍵即為軟件的一些基本功能。

RibbonCommand

以“Open”按鍵為例，首先仍然需要在<RibbonWindow.Resources>中定義其<RibbonCommand>內(nèi)容。

<r:RibbonCommand x:Key="OpenCommand" LabelTitle="Open"
                 CanExecute="OpenCommand_CanExecute"
                 Executed="OpenCommand_Executed"
                 SmallImageSource="Images/Open.png"
                 LargeImageSource="Images/Open.png"
                 ToolTipTitle="Open" 
                 ToolTipDescription="Open document" />

為<RibbonCommand>添加Command 事件實(shí)現(xiàn)打開文檔功能：

private void OpenCommand_CanExecute(object sender, CanExecuteRoutedEventArgs e)
{
    e.CanExecute = true;
}

private void OpenCommand_Executed(object sender, ExecutedRoutedEventArgs e)
{
    ShellContainer sc = KnownFolders.DocumentsLibrary as ShellContainer;
    CommonOpenFileDialog cofd = new CommonOpenFileDialog();
    cofd.InitialDirectoryShellContainer = sc;
    cofd.DefaultExtension = ".txt";
    cofd.Filters.Add(new CommonFileDialogFilter("Text Files", "*.txt"));
    if (cofd.ShowDialog() == CommonFileDialogResult.OK)
    {
        txtBox.Text = File.ReadAllText(cofd.FileName, Encoding.Default);
    }
}

ApplicationMenu

     <RibbonCommand>完成后繼續(xù)在<Ribbon>中添加<RibbonApplicationMenu>用于設(shè)置菜單列表中的內(nèi)容。其中<RibbonApplicationMenuItem>即為菜單按鍵，將相應(yīng)的<RibbonCommand>添加到Command 屬性中。另，按鍵之間可用<Separator>作為分隔。

<r:Ribbon DockPanel.Dock="Top" FocusManager.IsFocusScope="True" Title="WPF4 Notepad">
    <r:Ribbon.ApplicationMenu>
        <r:RibbonApplicationMenu Command="{StaticResource AppMenuCommand}">
            <r:RibbonApplicationMenuItem Command="{StaticResource OpenCommand}" />
            <r:RibbonApplicationMenuItem Command="{StaticResource SaveCommand}" />
            <Separator/>
            <r:RibbonApplicationSplitMenuItem Command="{StaticResource SendAsCommand}">
                <r:RibbonApplicationMenuItem Command="{StaticResource MailCommand}" />
                <r:RibbonApplicationMenuItem Command="{StaticResource TwitterCommand}" />
            </r:RibbonApplicationSplitMenuItem>
            <Separator/>
            <r:RibbonApplicationMenuItem Command="{StaticResource CloseCommand}" />
        </r:RibbonApplicationMenu>
    </r:Ribbon.ApplicationMenu>
</r:Ribbon>

     上面代碼中對于存在子菜單的按鍵（例如，SendAs 按鍵）可用<RibbonApplicationSplitMenuItem>對其進(jìn)行擴(kuò)展。子菜單標(biāo)題內(nèi)容可通過<RibbonCommand>的LabelDescription 屬性進(jìn)行設(shè)置（如下代碼）。

<r:RibbonCommand x:Key="SendAsCommand" LabelTitle="SendAs"
                 LabelDescription="Send this text to the World"
                 CanExecute="SendAsCommand_CanExecute"
                 SmallImageSource="Images/SendAs.png"
                 LargeImageSource="Images/SendAs.png"
                 ToolTipTitle="SendAs" 
                 ToolTipDescription="Send this text to the World" />

ApplicationButton

     最后來完成應(yīng)用程序菜單圖標(biāo)（記事本圖標(biāo)）的開發(fā)。當(dāng)然也需要通過<RibbonCommand>進(jìn)行設(shè)置，與之前不同之處在于不用添加CanExecute 和Executed 內(nèi)容。

<r:RibbonCommand x:Key="AppMenuCommand" LabelTitle="Application Button"
                 SmallImageSource="Images/Notepad.png"
                 LargeImageSource="Images/Notepad.png"
                 ToolTipTitle="WPF4 Notepad" 
                 ToolTipDescription="Notepad Application with Ribbon Sample" />

     將<RibbonCommand>加入<RibbonApplicationMenu> Command 屬性后默認(rèn)情況呈現(xiàn)下圖樣式，圖標(biāo)的形狀并不與Office 2007 一樣為圓形。

     如果想要圓形效果其實(shí)也很簡單，Ribbon 控件庫為我們提供了三種樣式模板：Office2007Black、Office2007Blue、Office2007Silver，只需在MainWindow() 中加入一行代碼即可實(shí)現(xiàn)圓形效果和不同的Ribbon 樣式。

public MainWindow()
{
    InitializeComponent();
    this.Resources.MergedDictionaries.Add(PopularApplicationSkins.Office2007Black);
}

     本篇關(guān)于應(yīng)用程序菜單的開發(fā)就介紹到這里，下篇將正式進(jìn)行標(biāo)簽工具欄（Tab Toolbar）的開發(fā)內(nèi)容。同時(shí)本示例源代碼也將一同公布。敬請關(guān)注… …