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MUX NavigationView should throw if WUXC NavViewItems are added to it #69

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merged 9 commits into from
Jan 19, 2019
Merged

MUX NavigationView should throw if WUXC NavViewItems are added to it #69

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5fe5386
Check for MUX items when updating the list source. Both on initial ev…
chrisglein Dec 11, 2018
b080d64
Use auto revoker
chrisglein Dec 11, 2018
53e071f
Detach revoker if list casts fail.
chrisglein Dec 11, 2018
573745e
Don't run test pre-RS3 when NavigationView wasn't available.
chrisglein Dec 12, 2018
e8a00d7
Use API present check instead of version check
chrisglein Dec 12, 2018
41edfdc
Disable VerifyCanNotAddWUXItems in Windows builds because it makes no…
Dec 12, 2018
efdb34b
Remove validation checks when in the Windows build.
Dec 12, 2018
7526468
Use PrepareContainerForItemOverride instead of a new VectorChanged li…
Dec 13, 2018
56fb005
Switch from using PrepareContainerForItemOverride to IsItemItsOwnCont…
Dec 15, 2018
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12 changes: 11 additions & 1 deletion dev/NavigationView/NavigationViewList.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,15 @@ bool NavigationViewList::IsItemItsOwnContainerOverride(winrt::IInspectable const
bool isItemItsOwnContainerOverride = false;
if (args)
{
// This validation is only relevant outside of the Windows build where WUXC and MUXC have distinct types.
#if !BUILD_WINDOWS
// Certain items are disallowed in a NavigationView's items list. Check for them.
if (args.try_as<winrt::Windows::UI::Xaml::Controls::NavigationViewItemBase>())
{
throw winrt::hresult_invalid_argument(L"MenuItems contains a Windows.UI.Xaml.Controls.NavigationViewItem. This control requires that the NavigationViewItems be of type Microsoft.UI.Xaml.Controls.NavigationViewItem.");
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MenuItems [](start = 52, length = 9)

MenuItems or MenuItemsSource

}
#endif

auto nvib = args.try_as<winrt::NavigationViewItemBase>();
if (nvib && nvib != m_lastItemCalledInIsItemItsOwnContainerOverride.get())
{
Expand Down Expand Up @@ -56,6 +65,7 @@ void NavigationViewList::PrepareContainerForItemOverride(winrt::DependencyObject
itemContainer.UseSystemFocusVisuals(m_showFocusVisual);
winrt::get_self<NavigationViewItem>(itemContainer)->ClearIsContentChangeHandlingDelayedForTopNavFlag();
}

__super::PrepareContainerForItemOverride(element, item);
}

Expand Down Expand Up @@ -133,4 +143,4 @@ void NavigationViewList::PropagateChangeToAllContainers(std::function<void(typen
}
}
}
}
}
33 changes: 33 additions & 0 deletions dev/NavigationView/NavigationView_ApiTests/NavigationViewTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,9 @@

using MUXControlsTestApp.Utilities;

using System;
using System.Collections.Generic;
using Windows.Foundation.Metadata;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Markup;
Expand Down Expand Up @@ -362,5 +365,35 @@ public void CanLoadSimpleNavigationView()
}
#endif

#if !BUILD_WINDOWS
[TestMethod]
public void VerifyCanNotAddWUXItems()
{
if (!ApiInformation.IsTypePresent("Windows.UI.Xaml.Controls.NavigationViewItem"))
{
Log.Warning("WUX version of NavigationViewItem only available starting in RS3.");
return;
}

RunOnUIThread.Execute(() =>
{
var navView = new NavigationView();

var muxItem = new Microsoft.UI.Xaml.Controls.NavigationViewItem { Content = "MUX Item" };
navView.MenuItems.Add(muxItem);

navView.MenuItems.Add(new Microsoft.UI.Xaml.Controls.NavigationViewItemSeparator());

// No errors should occur here when we only use MUX items
navView.UpdateLayout();

var wuxItem = new Windows.UI.Xaml.Controls.NavigationViewItem { Content = "WUX Item" };
navView.MenuItems.Add(wuxItem);

// But adding a WUX item should generate an exception (as soon as the new item gets processed)
Verify.Throws<Exception>(() => { navView.UpdateLayout(); });
});
}
#endif
}
}