HOW TO:使用內容功能表的拼字檢查
更新:2007 年 11 月
根據預設,當您在編輯控制項 (例如 TextBox 或 RichTextBox) 中啟用拼字檢查時,拼字檢查選項便會出現在內容功能表中。例如,當使用者以滑鼠右鍵按一下拼錯的文字時,他們會取得一組拼字建議或 [全部忽略] 的選項。不過,當您使用自己的自訂內容功能表覆寫預設內容功能表時,這項功能就會失效,而且您必須撰寫程式碼,以重新啟用內容功能表中的拼字檢查功能。下列範例示範如何在 TextBox 上啟用這項功能。
範例
下列範例顯示可延伸標記語言 (XAML) 使用用來實作內容功能表的幾項事件建立 TextBox。
<Page x:Class="SDKSample.SpellerCustomContextMenu"
xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml"
Loaded="OnWindowLoaded">
<TextBox
Name="myTextBox"
TextWrapping="Wrap"
SpellCheck.IsEnabled="True"
ContextMenuOpening="tb_ContextMenuOpening">
In a custum menu you need to write code to add speler choices
because everything in a custom context menu has to be added explicitly.
</TextBox>
</Page>
下列範例顯實作內容功能表的程式碼。
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
namespace SDKSample
{
public partial class SpellerCustomContextMenu : Page
{
void OnWindowLoaded(object sender, RoutedEventArgs e)
{
//This is required for the first time ContextMenu invocation so that TextEditor doesnt handle it.
myTextBox.ContextMenu = GetContextMenu();
}
void tb_ContextMenuOpening(object sender, RoutedEventArgs e)
{
int caretIndex, cmdIndex;
SpellingError spellingError;
myTextBox.ContextMenu = GetContextMenu();
caretIndex = myTextBox.CaretIndex;
cmdIndex = 0;
spellingError = myTextBox.GetSpellingError(caretIndex);
if (spellingError != null)
{
foreach (string str in spellingError.Suggestions)
{
MenuItem mi = new MenuItem();
mi.Header = str;
mi.FontWeight = FontWeights.Bold;
mi.Command = EditingCommands.CorrectSpellingError;
mi.CommandParameter = str;
mi.CommandTarget = myTextBox;
myTextBox.ContextMenu.Items.Insert(cmdIndex, mi);
cmdIndex++;
}
Separator separatorMenuItem1 = new Separator();
myTextBox.ContextMenu.Items.Insert(cmdIndex, separatorMenuItem1);
cmdIndex++;
MenuItem ignoreAllMI = new MenuItem();
ignoreAllMI.Header = "Ignore All";
ignoreAllMI.Command = EditingCommands.IgnoreSpellingError;
ignoreAllMI.CommandTarget = myTextBox;
myTextBox.ContextMenu.Items.Insert(cmdIndex, ignoreAllMI);
cmdIndex++;
Separator separatorMenuItem2 = new Separator();
myTextBox.ContextMenu.Items.Insert(cmdIndex, separatorMenuItem2);
}
}
// Gets a fresh context menu.
private ContextMenu GetContextMenu()
{
ContextMenu cm = new ContextMenu();
//Can create STATIC custom menu items if exists here...
MenuItem m1, m2, m3, m4;
m1 = new MenuItem();
m1.Header = "File";
m2 = new MenuItem();
m2.Header = "Save";
m3 = new MenuItem();
m3.Header = "SaveAs";
m4 = new MenuItem();
m4.Header = "Recent Files";
//Can add functionality for the custom menu items here...
cm.Items.Add(m1);
cm.Items.Add(m2);
cm.Items.Add(m3);
cm.Items.Add(m4);
return cm;
}
}
}
對 RichTextBox 執行這項動作的程式碼十分類似。主要差異是傳遞到 GetSpellingError 方法的參數。針對 TextBox,請傳遞插入號 (Caret) 位置的整數索引:
spellingError = myTextBox.GetSpellingError(caretIndex);
針對 RichTextBox,請傳遞指定插入號位置的 TextPointer:
spellingError = myRichTextBox.GetSpellingError(myRichTextBox.CaretPosition);