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如何:判斷 Windows Form RichTextBox 控制項中的格式屬性何時變更

Windows Forms RichTextBox 控制項的常見用法是使用字型選項或段落樣式等屬性來格式化文字。 您的應用程式可能需要追蹤文字格式設定的任何變更,以便顯示工具列,如同許多文字處理應用程式一樣。

若要回應格式化屬性中的變更

  1. SelectionChanged 事件處理常式中撰寫程式碼,根據屬性的值執行適當的動作。 下列範例會根據 SelectionBullet 屬性的值,變更工具列按鈕的外觀。 只有在控制項中移動插入點時,才會更新工具列按鈕。

    下列範例假設表單具有 RichTextBox 控制項,以及包含工具列按鈕的 ToolBar 控制項。 如需工具列和工具列按鈕的詳細資訊,請參閱如何:將按鈕新增至工具列控制項

    ' The following code assumes the existence of a toolbar control
    ' with at least one toolbar button.
    Private Sub RichTextBox1_SelectionChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles RichTextBox1.SelectionChanged
       If RichTextBox1.SelectionBullet = True Then
          ' Bullet button on toolbar should appear pressed
          ToolBarButton1.Pushed = True
       Else
           ' Bullet button on toolbar should appear unpressed
           ToolBarButton1.Pushed = False
       End If
    End Sub
    
    // The following code assumes the existence of a toolbar control
    // with at least one toolbar button.
    private void richTextBox1_SelectionChanged(object sender,
    System.EventArgs e)
    {
       if (richTextBox1.SelectionBullet == true)
       {
          // Bullet button on toolbar should appear pressed
          toolBarButton1.Pushed = true;
       }
       else
       {
          // Bullet button on toolbar should appear unpressed
          toolBarButton1.Pushed = false;
       }
    }
    
    // The following code assumes the existence of a toolbar control
    // with at least one toolbar button.
    private:
       System::Void richTextBox1_SelectionChanged(
          System::Object ^  sender, System::EventArgs ^  e)
       {
          if (richTextBox1->SelectionBullet == true)
          {
             // Bullet button on toolbar should appear pressed
             toolBarButton1->Pushed = true;
          }
          else
          {
             // Bullet button on toolbar should appear unpressed
             toolBarButton1->Pushed = false;
          }
       }
    

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