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Diffstat (limited to 'MediaBrowser.UI.Controls/TreeHelper.cs')
| -rw-r--r-- | MediaBrowser.UI.Controls/TreeHelper.cs | 321 |
1 files changed, 0 insertions, 321 deletions
diff --git a/MediaBrowser.UI.Controls/TreeHelper.cs b/MediaBrowser.UI.Controls/TreeHelper.cs deleted file mode 100644 index 0347f1eba..000000000 --- a/MediaBrowser.UI.Controls/TreeHelper.cs +++ /dev/null @@ -1,321 +0,0 @@ -using System; -using System.Collections.Generic; -using System.Linq; -using System.Windows; -using System.Windows.Media; - -namespace MediaBrowser.UI.Controls -{ - /// <summary> - /// Helper methods for UI-related tasks. - /// </summary> - public static class TreeHelper - { - /// <summary> - /// Gets the window. - /// </summary> - /// <param name="element">The element.</param> - /// <returns>Window.</returns> - /// <value>The window.</value> - public static Window GetWindow(this FrameworkElement element) - { - return element.ParentOfType<Window>(); - } - - /// <summary> - /// Gets the parent. - /// </summary> - /// <param name="element">The element.</param> - /// <returns>DependencyObject.</returns> - private static DependencyObject GetParent(this DependencyObject element) - { - DependencyObject parent = VisualTreeHelper.GetParent(element); - if (parent == null) - { - FrameworkElement frameworkElement = element as FrameworkElement; - if (frameworkElement != null) - { - parent = frameworkElement.Parent; - } - } - return parent; - } - - /// <summary> - /// Gets the parents. - /// </summary> - /// <param name="element">The element.</param> - /// <returns>IEnumerable{DependencyObject}.</returns> - /// <exception cref="System.ArgumentNullException">element</exception> - public static IEnumerable<DependencyObject> GetParents(this DependencyObject element) - { - if (element == null) - { - throw new ArgumentNullException("element"); - } - while ((element = element.GetParent()) != null) - { - yield return element; - } - yield break; - } - - /// <summary> - /// Parents the type of the of. - /// </summary> - /// <typeparam name="T"></typeparam> - /// <param name="element">The element.</param> - /// <returns>``0.</returns> - public static T ParentOfType<T>(this DependencyObject element) where T : DependencyObject - { - if (element == null) - { - return default(T); - } - return element.GetParents().OfType<T>().FirstOrDefault<T>(); - } - - /// <summary> - /// Finds a Child of a given item in the visual tree. - /// </summary> - /// <typeparam name="T">The type of the queried item.</typeparam> - /// <param name="parent">A direct parent of the queried item.</param> - /// <param name="childName">x:Name or Name of child.</param> - /// <returns>The first parent item that matches the submitted type parameter. - /// If not matching item can be found, - /// a null parent is being returned.</returns> - public static T FindChild<T>(DependencyObject parent, string childName) - where T : DependencyObject - { - // Confirm parent and childName are valid. - if (parent == null) return null; - - T foundChild = null; - - int childrenCount = VisualTreeHelper.GetChildrenCount(parent); - for (int i = 0; i < childrenCount; i++) - { - var child = VisualTreeHelper.GetChild(parent, i); - // If the child is not of the request child type child - T childType = child as T; - if (childType == null) - { - // recursively drill down the tree - foundChild = FindChild<T>(child, childName); - - // If the child is found, break so we do not overwrite the found child. - if (foundChild != null) break; - } - else if (!string.IsNullOrEmpty(childName)) - { - var frameworkElement = child as FrameworkElement; - // If the child's name is set for search - if (frameworkElement != null && frameworkElement.Name == childName) - { - // if the child's name is of the request name - foundChild = (T)child; - break; - } - } - else - { - // child element found. - foundChild = (T)child; - break; - } - } - - return foundChild; - } - - /// <summary> - /// Gets the visual child. - /// </summary> - /// <typeparam name="T"></typeparam> - /// <param name="referenceVisual">The reference visual.</param> - /// <returns>``0.</returns> - public static T GetVisualChild<T>(this Visual referenceVisual) where T : Visual - { - Visual child = null; - for (Int32 i = 0; i < VisualTreeHelper.GetChildrenCount(referenceVisual); i++) - { - child = VisualTreeHelper.GetChild(referenceVisual, i) as Visual; - if (child != null && (child.GetType() == typeof(T))) - { - break; - } - else if (child != null) - { - child = GetVisualChild<T>(child); - if (child != null && (child.GetType() == typeof(T))) - { - break; - } - } - } - return child as T; - } - - #region find parent - - /// <summary> - /// Finds a parent of a given item on the visual tree. - /// </summary> - /// <typeparam name="T">The type of the queried item.</typeparam> - /// <param name="child">A direct or indirect child of the - /// queried item.</param> - /// <returns>The first parent item that matches the submitted - /// type parameter. If not matching item can be found, a null - /// reference is being returned.</returns> - public static T TryFindParent<T>(this DependencyObject child) - where T : DependencyObject - { - //get parent item - DependencyObject parentObject = GetParentObject(child); - - //we've reached the end of the tree - if (parentObject == null) return null; - - //check if the parent matches the type we're looking for - T parent = parentObject as T; - if (parent != null) - { - return parent; - } - - //use recursion to proceed with next level - return TryFindParent<T>(parentObject); - } - - /// <summary> - /// This method is an alternative to WPF's - /// <see cref="VisualTreeHelper.GetParent" /> method, which also - /// supports content elements. Keep in mind that for content element, - /// this method falls back to the logical tree of the element! - /// </summary> - /// <param name="child">The item to be processed.</param> - /// <returns>The submitted item's parent, if available. Otherwise - /// null.</returns> - public static DependencyObject GetParentObject(this DependencyObject child) - { - if (child == null) return null; - - //handle content elements separately - ContentElement contentElement = child as ContentElement; - if (contentElement != null) - { - DependencyObject parent = ContentOperations.GetParent(contentElement); - if (parent != null) return parent; - - FrameworkContentElement fce = contentElement as FrameworkContentElement; - return fce != null ? fce.Parent : null; - } - - //also try searching for parent in framework elements (such as DockPanel, etc) - FrameworkElement frameworkElement = child as FrameworkElement; - if (frameworkElement != null) - { - DependencyObject parent = frameworkElement.Parent; - if (parent != null) return parent; - } - - //if it's not a ContentElement/FrameworkElement, rely on VisualTreeHelper - return VisualTreeHelper.GetParent(child); - } - - #endregion - - #region find children - - /// <summary> - /// Analyzes both visual and logical tree in order to find all elements of a given - /// type that are descendants of the <paramref name="source" /> item. - /// </summary> - /// <typeparam name="T">The type of the queried items.</typeparam> - /// <param name="source">The root element that marks the source of the search. If the - /// source is already of the requested type, it will not be included in the result.</param> - /// <returns>All descendants of <paramref name="source" /> that match the requested type.</returns> - public static IEnumerable<T> FindChildren<T>(this DependencyObject source) where T : DependencyObject - { - if (source != null) - { - var childs = GetChildObjects(source); - foreach (DependencyObject child in childs) - { - //analyze if children match the requested type - if (child is T) - { - yield return (T)child; - } - - //recurse tree - foreach (T descendant in FindChildren<T>(child)) - { - yield return descendant; - } - } - } - } - - - /// <summary> - /// This method is an alternative to WPF's - /// <see cref="VisualTreeHelper.GetChild" /> method, which also - /// supports content elements. Keep in mind that for content elements, - /// this method falls back to the logical tree of the element. - /// </summary> - /// <param name="parent">The item to be processed.</param> - /// <returns>The submitted item's child elements, if available.</returns> - public static IEnumerable<DependencyObject> GetChildObjects(this DependencyObject parent) - { - if (parent == null) yield break; - - if (parent is ContentElement || parent is FrameworkElement) - { - //use the logical tree for content / framework elements - foreach (object obj in LogicalTreeHelper.GetChildren(parent)) - { - var depObj = obj as DependencyObject; - if (depObj != null) yield return (DependencyObject)obj; - } - } - else - { - //use the visual tree per default - int count = VisualTreeHelper.GetChildrenCount(parent); - for (int i = 0; i < count; i++) - { - yield return VisualTreeHelper.GetChild(parent, i); - } - } - } - - #endregion - - #region find from point - - /// <summary> - /// Tries to locate a given item within the visual tree, - /// starting with the dependency object at a given position. - /// </summary> - /// <typeparam name="T">The type of the element to be found - /// on the visual tree of the element at the given location.</typeparam> - /// <param name="reference">The main element which is used to perform - /// hit testing.</param> - /// <param name="point">The position to be evaluated on the origin.</param> - /// <returns>``0.</returns> - public static T TryFindFromPoint<T>(UIElement reference, Point point) - where T : DependencyObject - { - DependencyObject element = reference.InputHitTest(point) as DependencyObject; - - if (element == null) return null; - - if (element is T) return (T)element; - - return TryFindParent<T>(element); - } - - #endregion - } -} |