NavMenuListView.cpp

#include "NavMenuListView.h"

using namespace Platform;
using namespace Windows::Foundation;
using namespace Windows::Foundation::Collections;
using namespace Windows::System;
using namespace Windows::UI::Core;
using namespace Windows::UI::Xaml;
using namespace Windows::UI::Xaml::Controls;
using namespace Windows::UI::Xaml::Data;
using namespace Windows::UI::Xaml::Documents;
using namespace Windows::UI::Xaml::Input;
using namespace Windows::UI::Xaml::Interop;
using namespace Windows::UI::Xaml::Media;
using namespace Windows::UI::Xaml::Media::Animation;

namespace VBA10
{
	namespace Controls
	{
		NavMenuListView::NavMenuListView()
		{
			this->SelectionMode = ListViewSelectionMode::Single;
			this->IsItemClickEnabled = true;
			this->ItemClick += ref new ItemClickEventHandler(this, &NavMenuListView::ItemClickHandler);

			// Locate the hosting SplitView control
			this->Loaded += ref new Windows::UI::Xaml::RoutedEventHandler(this, &VBA10::Controls::NavMenuListView::OnLoaded);
		}

		void NavMenuListView::OnLoaded(Platform::Object ^sender, Windows::UI::Xaml::RoutedEventArgs ^e)
		{
			auto parent = VisualTreeHelper::GetParent(this);
			while (parent != nullptr && dynamic_cast<SplitView^>(parent) == nullptr)
			{
				parent = VisualTreeHelper::GetParent((DependencyObject^)parent);
			}

			if (parent != nullptr)
			{
				_splitViewHost = dynamic_cast<SplitView^>(parent);

				_splitViewHost->RegisterPropertyChangedCallback(
					SplitView::IsPaneOpenProperty,
					ref new DependencyPropertyChangedCallback(this, &NavMenuListView::IsOpenPanePropertyChangedCallback));

				// Call once to ensure we're in the correct state
				OnPaneToggled();
			}
		}

		void NavMenuListView::IsOpenPanePropertyChangedCallback(DependencyObject^ sender, DependencyProperty^ args)
		{
			OnPaneToggled();
		}

		void NavMenuListView::OnApplyTemplate()
		{
			ListView::OnApplyTemplate();

			// Remove the entrance animation on the item containers.
			for (int i = 0; i < (int)ItemContainerTransitions->Size; i++)
			{
				if (dynamic_cast<EntranceThemeTransition^>(ItemContainerTransitions->GetAt(i)) != nullptr)
				{
					ItemContainerTransitions->RemoveAt(i);
				}
			}
		}

		

		///// <summary>
		///// Custom keyboarding logic to enable movement via the arrow keys without triggering selection 
		///// until a 'Space' or 'Enter' key is pressed. 
		///// </summary>
		///// <param name="e"></param>
		//void NavMenuListView::OnKeyDown(KeyRoutedEventArgs^ e)
		//{
		//	auto focusedItem = FocusManager::GetFocusedElement();

		//	auto shiftKeyState = CoreWindow::GetForCurrentThread()->GetKeyState(VirtualKey::Shift);
		//	auto shiftKeyDown = (shiftKeyState & CoreVirtualKeyStates::Down) == CoreVirtualKeyStates::Down;

		//	switch (e->Key)
		//	{
		//	case VirtualKey::Up:
		//		this->TryMoveFocus(FocusNavigationDirection::Up);
		//		e->Handled = true;
		//		break;

		//	case VirtualKey::Down:
		//		this->TryMoveFocus(FocusNavigationDirection::Down);
		//		e->Handled = true;
		//		break;

		//	case VirtualKey::Tab:
		//		// If we're on the header item then this will be null and we'll still get the default behavior.
		//		if (dynamic_cast<ListViewItem^>(focusedItem) != nullptr)
		//		{
		//			auto currentItem = (ListViewItem^)focusedItem;
		//			bool onlastitem = currentItem != nullptr && IndexFromContainer(currentItem) == Items->Size - 1;
		//			bool onfirstitem = currentItem != nullptr && IndexFromContainer(currentItem) == 0;

		//			if (!shiftKeyDown)
		//			{
		//				if (onlastitem)
		//				{
		//					this->TryMoveFocus(FocusNavigationDirection::Next);
		//				}
		//				else
		//				{
		//					this->TryMoveFocus(FocusNavigationDirection::Down);
		//				}
		//			}
		//			else // Shift + Tab
		//			{
		//				if (onfirstitem)
		//				{
		//					this->TryMoveFocus(FocusNavigationDirection::Previous);
		//				}
		//				else
		//				{
		//					this->TryMoveFocus(FocusNavigationDirection::Up);
		//				}
		//			}
		//		}
		//		else if (dynamic_cast<Control^>(focusedItem) != nullptr)
		//		{
		//			if (!shiftKeyDown)
		//			{
		//				this->TryMoveFocus(FocusNavigationDirection::Down);
		//			}
		//			else // Shift + Tab
		//			{
		//				this->TryMoveFocus(FocusNavigationDirection::Up);
		//			}
		//		}

		//		e->Handled = true;
		//		break;

		//	case VirtualKey::Space:
		//	case VirtualKey::Enter:
		//		// Fire our event using the item with current keyboard focus
		//		InvokeItem(focusedItem);
		//		e->Handled = true;
		//		break;

		//	default:
		//		ListView::OnKeyDown(e);
		//		break;
		//	}
		//}

		/// <summary>
		/// This method is a work-around until the bug in FocusManager.TryMoveFocus is fixed.
		/// </summary>
		/// <param name="direction"></param>
		//void NavMenuListView::TryMoveFocus(FocusNavigationDirection direction)
		//{
		//	if (direction == FocusNavigationDirection::Next || direction == FocusNavigationDirection::Previous)
		//	{
		//		FocusManager::TryMoveFocus(direction);
		//	}
		//	else
		//	{
		//		auto control = dynamic_cast<Control^>(FocusManager::FindNextFocusableElement(direction));
		//		if (control != nullptr)
		//		{
		//			control->Focus(Windows::UI::Xaml::FocusState::Programmatic);
		//		}
		//	}
		//}

		void NavMenuListView::ItemClickHandler(Object^ sender, ItemClickEventArgs^ e)
		{
			// Triggered when the item is selected using something other than a keyboard
			auto item = ContainerFromItem(e->ClickedItem);
			InvokeItem(item);
		}

		void NavMenuListView::InvokeItem(Object^ focusedItem)
		{
			auto item = dynamic_cast<ListViewItem^>(focusedItem);
			SetSelectedItem(item);
			ItemInvoked(this, item);

			//if (_splitViewHost->IsPaneOpen && (
			//	_splitViewHost->DisplayMode == SplitViewDisplayMode::CompactOverlay ||
			//	_splitViewHost->DisplayMode == SplitViewDisplayMode::Overlay))
			//{
			//	_splitViewHost->IsPaneOpen = false;
			//	if (item != nullptr)
			//	{
			//		item->Focus(Windows::UI::Xaml::FocusState::Programmatic);
			//	}
			//}
		}

		/// <summary>
		/// Mark the <paramref name="item"/> as selected and ensures everything else is not.
		/// If the <paramref name="item"/> is null then everything is unselected.
		/// </summary>
		/// <param name="item"></param>
		void NavMenuListView::SetSelectedItem(ListViewItem^ item)
		{
			int index = -1;
			if (item != nullptr)
			{
				index = IndexFromContainer(item);
			}

			for (int i = 0; i < (int)Items->Size; i++)
			{
				auto lvi = (ListViewItem^)ContainerFromIndex(i);
				if (lvi != nullptr)
				{

					if (i != index)
					{
						lvi->IsSelected = false;
					}
					else if (i == index)
					{
						lvi->IsSelected = true;
					}
				}

			}
		}

		/// <summary>
		/// Re-size the ListView's Panel when the SplitView is compact so the items
		/// will fit within the visible space and correctly display a keyboard focus rect.
		/// </summary>
		void NavMenuListView::OnPaneToggled()
		{
			if (_splitViewHost->IsPaneOpen)
			{
				ItemsPanelRoot->ClearValue(FrameworkElement::WidthProperty);
				ItemsPanelRoot->ClearValue(FrameworkElement::HorizontalAlignmentProperty);
			}
			else if (_splitViewHost->DisplayMode == SplitViewDisplayMode::CompactInline ||
				_splitViewHost->DisplayMode == SplitViewDisplayMode::CompactOverlay)
			{
				ItemsPanelRoot->SetValue(FrameworkElement::WidthProperty, _splitViewHost->CompactPaneLength);
				ItemsPanelRoot->SetValue(FrameworkElement::HorizontalAlignmentProperty, Windows::UI::Xaml::HorizontalAlignment::Left);
			}
		}
	}
}