protected override async void Invoke(VisualElement sender)
{
if (Property == null)
{
throw new InvalidOperationException($"{nameof(Property)} may not be null");
}
if (Value == null)
{
throw new InvalidOperationException($"{nameof(Value)} may not be null");
}
TargetElement = TargetElement ?? sender ?? throw new ArgumentNullException(nameof(sender));
Type targetElementType = TargetElement.GetType();
PropertyInfo?propertyInfo = targetElementType.GetProperty(Property);
if (propertyInfo == null)
{
throw new ArgumentException($"Could not find property {Property} in {targetElementType}");
}
Type propertyType = propertyInfo.PropertyType;
if (propertyType != Value.GetType())
{
if (ConvertUsingXamlTypeConverter(propertyInfo, Value, out object?resultValue))
{
Value = resultValue !;
}
else
{
Value = ConvertUsingDotNetTypeConverter(propertyType, Value);
}
}
if (Delay != null)
{
int delay = Convert.ToInt32(Delay, CultureInfo.InvariantCulture);
await Task.Delay(delay);
}
propertyInfo.SetValue(TargetElement, Value);
}
public override void AddChild(XF.Element child, int physicalSiblingIndex)
{
if (child is null)
{
throw new ArgumentNullException(nameof(child));
}
var removedDummyChild = ClearDummyChild();
switch (child)
{
case XF.TemplatedPage childAsTemplatedPage:
ShellControl.Items.Add(childAsTemplatedPage); // Implicit conversion
break;
case XF.ShellContent childAsShellContent:
ShellControl.Items.Add(childAsShellContent); // Implicit conversion
break;
case XF.ShellSection childAsShellSection:
ShellControl.Items.Add(childAsShellSection); // Implicit conversion
break;
case XF.MenuItem childAsMenuItem:
ShellControl.Items.Add(childAsMenuItem); // Implicit conversion
break;
case XF.ShellItem childAsShellItem:
ShellControl.Items.Add(childAsShellItem);
break;
default:
throw new NotSupportedException($"Handler of type '{GetType().FullName}' representing element type '{TargetElement?.GetType().FullName ?? "<null>"}' doesn't support adding a child (child type is '{child.GetType().FullName}').");
}
// TODO: If this was the first item added, mark it as the current item
// But this code seems to cause a NullRef...
//if (removedDummyChild)
//{
// ShellControl.CurrentItem = parentAsShell.Items[0];
//}
}
public override void AddChild(XF.Element child, int physicalSiblingIndex)
{
if (child is null)
{
throw new ArgumentNullException(nameof(child));
}
switch (child)
{
case XF.TemplatedPage childAsTemplatedPage:
ShellSectionControl.Items.Add(childAsTemplatedPage); // Implicit conversion
break;
case XF.ShellContent childAsShellContent:
ShellSectionControl.Items.Add(childAsShellContent);
break;
default:
throw new NotSupportedException($"Handler of type '{GetType().FullName}' representing element type '{TargetElement?.GetType().FullName ?? "<null>"}' doesn't support adding a child (child type is '{child.GetType().FullName}').");
}
}
public virtual void RemoveChild(XF.Element child)
{
if (child is null)
{
throw new ArgumentNullException(nameof(child));
}
var sectionToRemove = GetSectionForElement(child)
?? throw new NotSupportedException($"Handler of type '{GetType().FullName}' representing element type '{TargetElement?.GetType().FullName ?? "<null>"}' doesn't support removing a child (child type is '{child.GetType().FullName}').");
ShellItemControl.Items.Remove(sectionToRemove);
}
public virtual void AddChild(XF.Element child, int physicalSiblingIndex)
{
if (child is null)
{
throw new ArgumentNullException(nameof(child));
}
XF.ShellSection sectionToAdd = child switch
{
XF.TemplatedPage childAsTemplatedPage => childAsTemplatedPage, // Implicit conversion
XF.ShellContent childAsShellContent => childAsShellContent, // Implicit conversion
XF.ShellSection childAsShellSection => childAsShellSection,
_ => throw new NotSupportedException($"Handler of type '{GetType().FullName}' representing element type '{TargetElement?.GetType().FullName ?? "<null>"}' doesn't support adding a child (child type is '{child.GetType().FullName}').")
};
if (ShellItemControl.Items.Count >= physicalSiblingIndex)
{
ShellItemControl.Items.Insert(physicalSiblingIndex, sectionToAdd);
}
else
{
Debug.WriteLine($"WARNING: {nameof(AddChild)} called with {nameof(physicalSiblingIndex)}={physicalSiblingIndex}, but ShellItemControl.Items.Count={ShellItemControl.Items.Count}");
ShellItemControl.Items.Add(sectionToAdd);
}
}
public virtual void RemoveChild(XF.Element child)
{
if (child is null)
{
throw new ArgumentNullException(nameof(child));
}
XF.ShellContent contentToRemove = child switch
{
XF.TemplatedPage childAsTemplatedPage => GetContentForTemplatePage(childAsTemplatedPage),
XF.ShellContent childAsShellContent => childAsShellContent,
_ => throw new NotSupportedException($"Handler of type '{GetType().FullName}' representing element type '{TargetElement?.GetType().FullName ?? "<null>"}' doesn't support removing a child (child type is '{child.GetType().FullName}').")
};
ShellSectionControl.Items.Remove(contentToRemove);
}
public virtual void AddChild(MC.Element child, int physicalSiblingIndex)
{
if (child is null)
{
throw new ArgumentNullException(nameof(child));
}
MC.ShellContent contentToAdd = child switch
{
MC.TemplatedPage childAsTemplatedPage => childAsTemplatedPage, // Implicit conversion
MC.ShellContent childAsShellContent => childAsShellContent,
_ => throw new NotSupportedException($"Handler of type '{GetType().FullName}' representing element type '{TargetElement?.GetType().FullName ?? "<null>"}' doesn't support adding a child (child type is '{child.GetType().FullName}').")
};
// Ensure that there is non-null Content to avoid exceptions in Xamarin.Forms
contentToAdd.Content ??= new MC.Page();
if (ShellSectionControl.Items.Count >= physicalSiblingIndex)
{
ShellSectionControl.Items.Insert(physicalSiblingIndex, contentToAdd);
}
else
{
Debug.WriteLine($"WARNING: {nameof(AddChild)} called with {nameof(physicalSiblingIndex)}={physicalSiblingIndex}, but ShellSectionControl.Items.Count={ShellSectionControl.Items.Count}");
ShellSectionControl.Items.Add(contentToAdd);
}
}
private void Register()
{
if (TargetElement == null)
{
return;
}
if (EnableListenSource)
{
dpd = DependencyPropertyDescriptor.FromProperty(ListBox.ItemsSourceProperty, TargetElement.GetType());
dpd.RemoveValueChanged(TargetElement, dpdValueChanged);
}
TargetElement.Loaded += new RoutedEventHandler(TargetElement_Loaded);
TargetElement.Unloaded += new RoutedEventHandler(TargetElement_Unloaded);
}
