HOW TO:判斷 Windows Form RichTextBox 控制項中的格式屬性何時變更
更新:2007 年 11 月
Windows Form RichTextBox 控制項的常見用法之一是使用屬性格式化文字,例如字型選項或段落樣式。您的應用程式可能需要記錄文字格式的任何變更以便顯示工具列,就像許多文書處理應用程式的做法一樣。
若要回應格式屬性 (Attribute) 中的變更
在 SelectionChanged 事件處理常式中寫入程式碼,以便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。工具列按鈕只會在插入點移入控制項時更新。
以下範例假設含有 RichTextBox 控制項和含有工具列按鈕的 ToolBar 控制項之表單。如需工具列和工具列按鈕的詳細資料,請參閱 HOW TO:將按鈕加入至 ToolBar 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; } }