/// <summary>
/// Handle the Loaded event of the element to which this view model is attached
/// inorder to enable the attached
/// view model to bind to properties of the parent element
/// </summary>
static void Element_Loaded(object sender, RoutedEventArgs e)
{
FrameworkElement targetElement = sender as FrameworkElement;
FrameworkElement parent = targetElement.Parent as FrameworkElement;
// use the attached view model as the DataContext of the element it is attached to
AttachedViewModelBase attachedModel = GetAttach(targetElement);
targetElement.DataContext = attachedModel;
// find the ProgressBar and associated it with the view model
var progressBar = targetElement.Ancestors <ProgressBar>().Single() as ProgressBar;
attachedModel.SetProgressBar(progressBar);
// bind the DataContext of the view model to the DataContext of the parent.
attachedModel.SetBinding(AttachedViewModelBase.DataContextProperty,
new Binding("DataContext")
{
Source = parent
});
// bind the piggyback to give DataContext change notification
attachedModel.SetBinding(AttachedViewModelBase.DataContextPiggyBackProperty,
new Binding("DataContext")
{
Source = parent
});
}
/// <summary>
/// Handle the Loaded event of the element to which this view model is attached
/// in order to enable the attached
/// view model to bind to properties of the parent element
/// </summary>
static void Element_Loaded(object sender, RoutedEventArgs e)
{
FrameworkElement targetElement = sender as FrameworkElement;
CircularProgressBarViewModel attachedModel = GetAttach(targetElement);
// find the ProgressBar and associated it with the view model
var progressBar = targetElement.Ancestors <ProgressBar>().Single() as ProgressBar;
attachedModel.SetProgressBar(progressBar);
}
/// <summary>
/// Finds the frame identified with given name in the specified context.
/// </summary>
/// <param name="name">The frame name.</param>
/// <param name="context">The framework element providing the context for finding a frame.</param>
/// <returns>The frame or null if the frame could not be found.</returns>
public static ModernFrame FindFrame(string name, FrameworkElement context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
// collect all ancestor frames
var frames = context.Ancestors().OfType <ModernFrame>().ToArray();
if (name == null || name == "_self")
{
// find first ancestor frame
return(frames.FirstOrDefault());
}
if (name == "_parent")
{
// find parent frame
return(frames.Skip(1).FirstOrDefault());
}
if (name == "_top")
{
// find top-most frame
return(frames.LastOrDefault());
}
// find ancestor frame having a name matching the target
var frame = frames.FirstOrDefault(f => f.Name == name);
if (frame == null)
{
// find frame in context scope
frame = context.FindName(name) as ModernFrame;
if (frame == null)
{
// find frame in scope of ancestor frame content
var parent = frames.FirstOrDefault();
if (parent != null && parent.Content != null)
{
var content = parent.Content as FrameworkElement;
if (content != null)
{
frame = content.FindName(name) as ModernFrame;
}
}
}
}
return(frame);
}
public static ModernFrame FindFrame(string name, FrameworkElement context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
var frames = context.Ancestors().OfType <ModernFrame>().ToArray();
if (name == null || name == "_self")
{
return(frames.FirstOrDefault());
}
if (name == "_parent")
{
return(frames.Skip(1).FirstOrDefault());
}
if (name == "_top")
{
return(frames.LastOrDefault());
}
var frame = frames.FirstOrDefault(f => f.Name == name);
if (frame == null)
{
frame = context.FindName(name) as ModernFrame;
if (frame == null)
{
var parent = frames.FirstOrDefault();
if (parent != null && parent.Content != null)
{
var content = parent.Content as FrameworkElement;
if (content != null)
{
frame = content.FindName(name) as ModernFrame;
}
}
}
}
return(frame);
}
private void OnDataGridPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (!(sender is VsDataGrid dataGrid))
{
return;
}
FrameworkElement fe = GetFrameworkElement(e.OriginalSource);
DataGridCell cell = fe?.Ancestors().OfType <DataGridCell>().FirstOrDefault();
if (cell == null || cell.IsEditing || cell.IsReadOnly || Keyboard.Modifiers != ModifierKeys.None)
{
return;
}
if (!cell.IsFocused)
{
cell.Focus();
}
if (dataGrid.SelectionUnit != DataGridSelectionUnit.FullRow)
{
if (!cell.IsSelected)
{
cell.IsSelected = true;
}
}
else
{
DataGridRow row = cell.Ancestors().OfType <DataGridRow>().FirstOrDefault();
if (row == null || !row.IsSelected)
{
return;
}
row.IsSelected = true;
}
}
public static IEnumerable <FrameworkElement> VisualAncestors <T>(this FrameworkElement element)
{
return(element.Ancestors(toParent));
}