■ FlowDocumentReader 클래스에서 수평/수직 ScrollBar 객체를 구하는 방법을 보여준다.
▶ 예제 코드 (C#)
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using System; using System.Windows; using System.Windows.Controls; using System.Windows.Controls.Primitives; using System.Windows.Media; #region 수평 스크롤바 찾기 - FindHorizontalScrollBar(flowDocumentReader) /// <summary> /// 수평 스크롤바 찾기 /// </summary> /// <param name="flowDocumentReader">플로우 문서 리더</param> /// <returns>수평 스크롤바</returns> public ScrollBar FindHorizontalScrollBar(FlowDocumentReader flowDocumentReader) { return FindScrollBar(flowDocumentReader, Orientation.Horizontal); } #endregion #region 수직 스크롤바 찾기 - FindVerticalScrollBar(flowDocumentReader) /// <summary> /// 수직 스크롤바 찾기 /// </summary> /// <param name="flowDocumentReader">플로우 문서 리더</param> /// <returns>수직 스크롤바</returns> public ScrollBar FindVerticalScrollBar(FlowDocumentReader flowDocumentReader) { return FindScrollBar(flowDocumentReader, Orientation.Vertical); } #endregion #region 스크롤바 찾기 - FindScrollBar(flowDocumentReader, orientation) /// <summary> /// 스크롤바 찾기 /// </summary> /// <param name="flowDocumentReader">플로우 문서 리더</param> /// <param name="orientation">방향</param> /// <returns>스크롤바</returns> public ScrollBar FindScrollBar(FlowDocumentReader flowDocumentReader, Orientation orientation) { if(flowDocumentReader == null) { return null; } ScrollViewer scrollViewer = VisualHelper.FindDescendantByType<ScrollViewer>(flowDocumentReader); if(scrollViewer == null) { return null; } return FindDescendantByType<ScrollBar>(scrollViewer, scrollBar => scrollBar.Orientation == orientation); } #endregion #region 타입으로 자손 찾기 - FindDescendantByType(source, descendantType, specificTypeOnly) /// <summary> /// 타입으로 자손 찾기 /// </summary> /// <param name="source">소스 객체</param> /// <param name="descendantType">자손 타입</param> /// <param name="specificTypeOnly">특정 타입만 찾기 여부</param> /// <returns>자손 객체</returns> private Visual FindDescendantByType(Visual source, Type descendantType, bool specificTypeOnly) { if(source == null) { return null; } if(specificTypeOnly ? (source.GetType() == descendantType) : (source.GetType() == descendantType) || (source.GetType().IsSubclassOf(descendantType))) { return source; } Visual descendant = null; if(source is FrameworkElement) { (source as FrameworkElement).ApplyTemplate(); } for(int i = 0; i < VisualTreeHelper.GetChildrenCount(source); i++) { Visual visual = VisualTreeHelper.GetChild(source, i) as Visual; descendant = FindDescendantByType(visual, descendantType, specificTypeOnly); if(descendant != null) { break; } } return descendant; } #endregion #region 타입으로 자손 찾기 - FindDescendantByType(source, descendantType) /// <summary> /// 타입으로 자손 찾기 /// </summary> /// <param name="source">소스 객체</param> /// <param name="descendantType">자손 타입</param> /// <returns>자손 객체</returns> private Visual FindDescendantByType(Visual source, Type descendantType) { return FindDescendantByType(source, descendantType, true); } #endregion #region 타입으로 자손 찾기 - FindDescendantByType<TDescendant>(source) /// <summary> /// 타입으로 자손 찾기 /// </summary> /// <typeparam name="TDescendant">자손 타입</typeparam> /// <param name="source">소스 객체</param> /// <returns>자손 객체</returns> private TDescendant FindDescendantByType<TDescendant>(Visual source) where TDescendant : Visual { Visual descendant = FindDescendantByType(source, typeof(TDescendant)); return (TDescendant)descendant; } #endregion #region 타입으로 자손 찾기 - FindDescendantByType<TDescendant>(source, conditionFunction) /// <summary> /// 타입으로 자손 찾기 /// </summary> /// <typeparam name="TDescendant">자손 타입</typeparam> /// <param name="source">소스 객체</param> /// <param name="conditionFunction">조건 함수</param> /// <returns>자손 객체</returns> private TDescendant FindDescendantByType<TDescendant>(DependencyObject source, Func<TDescendant, bool> conditionFunction = null) where TDescendant : DependencyObject { if(source == null) { return null; } for(int i = 0; i < VisualTreeHelper.GetChildrenCount(source); i++) { DependencyObject child = VisualTreeHelper.GetChild(source, i); if(child is TDescendant typedChild && (conditionFunction == null || conditionFunction(typedChild))) { return typedChild; } TDescendant descendant = FindDescendantByType<TDescendant>(child, conditionFunction); if(descendant != null) { return descendant; } } return null; } #endregion |