/// <summary>
/// This method does the walk in the visual or logical tree, depending on the existance
/// of the visual tree for the specified <paramref name="obj"/>.
/// </summary>
/// <remarks>
/// The tree walk will use the visual tree if the specified <paramref name="obj"/>
/// is a <see cref="Visual"/>, else it will use its logical tree.
/// This method attaches change handlers to all relevant properties on the searched path.
/// </remarks>
/// <param name="obj">The object to get the parent of.</param>
/// <param name="parent">The parent which was found navigating the visual or
/// logical tree.</param>
/// <param name="findParentMode">Specifies, which tree will be used to find the parent
/// object.</param>
/// <returns><c>true</c>, if a valid parent was found. In this case, the
/// <paramref name="parent"/> parameter references a not-<c>null</c> parent.
/// <c>false</c>, if no valid parent was found.</returns>
protected bool FindParent(DependencyObject obj, out DependencyObject parent,
FindParentMode findParentMode)
{
bool result;
switch (findParentMode)
{
case FindParentMode.HybridPreferVisualTree:
result = FindParent_VT(obj, out parent) || FindParent_LT(obj, out parent);
#if DEBUG_BINDINGS
if (!result)
{
DebugOutput("FindParent didn't find a parent in VT or LT for object '{0}'", obj);
}
#endif
return(result);
case FindParentMode.HybridPreferLogicalTree:
result = FindParent_LT(obj, out parent) || FindParent_VT(obj, out parent);
#if DEBUG_BINDINGS
if (!result)
{
DebugOutput("FindParent didn't find a parent in LT or VT for object '{0}'", obj);
}
#endif
return(result);
case FindParentMode.LogicalTree:
result = FindParent_LT(obj, out parent);
#if DEBUG_BINDINGS
if (!result)
{
DebugOutput("FindParent didn't find a parent in LT for object '{0}'", obj);
}
#endif
return(result);
default:
// Should never occur. If so, we have forgotten to handle a SourceType
throw new NotImplementedException(
string.Format("FindParentMode '{0}' is not implemented", findParentMode));
}
}
/// <summary>
/// This method does the walk in the visual or logical tree, depending on the existance
/// of the visual tree for the specified <paramref name="obj"/>.
/// </summary>
/// <remarks>
/// The tree walk will use the visual tree if the specified <paramref name="obj"/>
/// is a <see cref="Visual"/>, else it will use its logical tree.
/// This method attaches change handlers to all relevant properties on the searched path.
/// </remarks>
/// <param name="obj">The object to get the parent of.</param>
/// <param name="parent">The parent which was found navigating the visual or
/// logical tree.</param>
/// <param name="findParentMode">Specifies, which tree will be used to find the parent
/// object.</param>
/// <returns><c>true</c>, if a valid parent was found. In this case, the
/// <paramref name="parent"/> parameter references a not-<c>null</c> parent.
/// <c>false</c>, if no valid parent was found.</returns>
protected bool FindParent(DependencyObject obj, out DependencyObject parent,
FindParentMode findParentMode)
{
bool result;
switch (findParentMode)
{
case FindParentMode.HybridPreferVisualTree:
result = FindParent_VT(obj, out parent) || FindParent_LT(obj, out parent);
#if DEBUG_BINDINGS
if (!result)
DebugOutput("FindParent didn't find a parent in VT or LT for object '{0}'", obj);
#endif
return result;
case FindParentMode.HybridPreferLogicalTree:
result = FindParent_LT(obj, out parent) || FindParent_VT(obj, out parent);
#if DEBUG_BINDINGS
if (!result)
DebugOutput("FindParent didn't find a parent in LT or VT for object '{0}'", obj);
#endif
return result;
case FindParentMode.LogicalTree:
result = FindParent_LT(obj, out parent);
#if DEBUG_BINDINGS
if (!result)
DebugOutput("FindParent didn't find a parent in LT for object '{0}'", obj);
#endif
return result;
default:
// Should never occur. If so, we have forgotten to handle a SourceType
throw new NotImplementedException(
string.Format("FindParentMode '{0}' is not implemented", findParentMode));
}
}
protected bool FindAncestor(DependencyObject current, out DependencyObject ancestor, FindParentMode mode, int ancestorLevel, Type ancestorType)
{
ancestor = null;
if (!FindParent(current, out current, mode)) // Start from the first ancestor
return false;
int ct = ancestorLevel;
while (current != null)
{
if (ancestorType == null ||
ancestorType.IsAssignableFrom(current.GetType()))
ct -= 1;
if (ct == 0)
{
ancestor = current;
return true;
}
if (!FindParent(current, out current, mode))
return false;
}
return false;
}
protected bool FindAncestor(DependencyObject current, out DependencyObject ancestor, FindParentMode mode, int ancestorLevel, Type ancestorType)
{
ancestor = null;
if (!FindParent(current, out current, mode)) // Start from the first ancestor
{
return(false);
}
int ct = ancestorLevel;
while (current != null)
{
if (ancestorType == null ||
ancestorType.IsAssignableFrom(current.GetType()))
{
ct -= 1;
}
if (ct == 0)
{
ancestor = current;
return(true);
}
if (!FindParent(current, out current, mode))
{
return(false);
}
}
return(false);
}
