/// <summary>
/// Method executes when the SelectionChanged command is invoked.
/// The parameter <paramref name="p"/> can be an array of objects
/// containing objects of the <seealso cref="IFolderItemViewModel"/> type
/// or p can also be string.
///
/// Each parameter item that adheres to the above types results in
/// a OnCurrentPathChanged event being fired with the folder path
/// as parameter.
///
/// This mwthod can typically be invoked by:
/// 1> Edit the text portion + Enter in the control or
/// 2> By selecting an entry from the drop down list of the combobox.
/// </summary>
/// <param name="p"></param>
private async Task SelectionChanged_ExecutedAsync(object p)
{
if (p == null)
{
return;
}
// Check if the given parameter is a string, fire a corresponding event if so...
if (p is string)
{
IPathModel param = null;
try
{
param = PathFactory.Create(p as string);
}
catch
{
return; // Control will refuse to select an unknown/non-existing item
}
// This breaks a possible recursion, if a new view is requested even though its
// already available, because this could, otherwise, change the SelectedItem
// which in turn could request another PopulateView(...) -> SelectedItem etc ...
if (SelectedItem != null)
{
if (SelectedItem.Equals(param))
{
return;
}
}
if (param != null)
{
var request = new BrowseRequest(param);
await InternalPopulateViewAsync(request, true);
}
}
else
{
if (p is object[])
{
var param = p as object[];
if (param != null)
{
if (param.Length > 0)
{
var newPath = param[param.Length - 1] as IFolderItemViewModel;
if (newPath != null)
{
IPathModel location = null;
IPathModel selectedItemModel = null;
try
{
location = PathFactory.Create(newPath.ItemPath, newPath.ItemType);
selectedItemModel = PathFactory.Create(SelectedItem.ItemPath, SelectedItem.ItemType);
}
catch
{
}
if (location == null || selectedItemModel == null)
{
return;
}
// This breaks a possible recursion, if a new view is requested even though its
// already available, because this could, otherwise, change the SelectedItem
// which in turn could request another PopulateView(...) -> SelectedItem etc ...
if (location.Equals(selectedItemModel))
{
return;
}
var request = new BrowseRequest(location);
await InternalPopulateViewAsync(request, true);
}
}
}
}
}
}
