Let me first state how frustrated I am in not being able to find many examples that are written in C++ for UWP/WinRT. I need to be able to reference and use shared .H files, so C# is not very useful. And guess what, almost all the examples I found are in C#. I am no dummy, but I don't always know the conversion code from C# to C++.
I have Googled for the information I seek, searched for books, and read some web pages, but I have failed in finding the info I seek, so now I ask you (the coders that will know) how to solve my problem or where I might find the answers.
Here is the problem in a nutshell, I need the code for the NavigationView UI control in UWP written in C++. I followed the C# examples as best I could, but my code does not compile nor is it complete. There are 3 functions that I need to complete but I can't get them converted. I can give you any code file you want, but only give the 2 that pertain right now. Just ask if you need me to clarify something.
XAML file
<Page
x:Class="Kcam_GUI_Test.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Kcam_GUI_Test"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Background="#FFB0B0B0"
Foreground="#FF000000">
<NavigationView x:Name="NavView"
PaneDisplayMode="Top"
IsBackButtonVisible="Collapsed"
SelectionChanged="NavView_SelectionChanged">
<NavigationView.Resources>
<SolidColorBrush x:Key="TopNavigationViewItemForegroundPointerOver" Color="Black"/>
<SolidColorBrush x:Key="TopNavigationViewItemBackgroundPointerOver" Color="#FF005BAF"/>
<SolidColorBrush x:Key="TopNavigationViewItemForegroundSelected" Color="Black"/>
<SolidColorBrush x:Key="TopNavigationViewItemBackgroundSelected" Color="#FF005BAF"/>
<SolidColorBrush x:Key="TopNavigationViewItemForegroundSelectedPointerOver" Color="Black"/>
<SolidColorBrush x:Key="TopNavigationViewItemBackgroundSelectedPointerOver" Color="#FF005BAF"/>
<SolidColorBrush x:Key="TopNavigationViewItemForegroundPressed" Color="Black"/>
<SolidColorBrush x:Key="TopNavigationViewItemBackgroundPressed" Color="#FF005BAF"/>
<SolidColorBrush x:Key="TopNavigationViewItemForegroundSelectedPressed" Color="Black"/>
<SolidColorBrush x:Key="TopNavigationViewItemBackgroundSelectedPressed" Color="#FF005BAF"/>
</NavigationView.Resources>
<NavigationView.MenuItems>
<NavigationViewItem x:Name="OperationNav" Content="Operation" Tag="NavOperation" FontWeight="Bold"/>
<NavigationViewItem x:Name="AdminNav" Content="Administration" Tag="NavAdmin" FontWeight="Bold"/>
<NavigationViewItem x:Name="AdvancedNav" Content="Advanced" Tag="NavAdvanced" FontWeight="Bold"/>
<NavigationViewItem x:Name="FactoryNav" Content="Factory" Tag="NavFactory" FontWeight="Bold"/>
</NavigationView.MenuItems>
<StackPanel>
<Rectangle Height="25">
<Rectangle.Fill>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FF005BAF"/>
<GradientStop Color="#FFB0B0B0" Offset="1"/>
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
<Frame x:Name="NavFrame" Margin="0,5,0,0" BorderThickness="1" BorderBrush="Black" Height="1000">
<Slider Width="200" Height="50" Maximum="100" StepFrequency="10" TickPlacement="Inline" />
</Frame>
</StackPanel>
</NavigationView>
And just the 3 C++ functions that are causing me grief. Only one function is referenced in the XAML file.
// This code is for when the NavigationView is clicked so it selects the correct page to navigate to.
void MainPage::NavView_SelectionChanged(NavigationView sender, NavigationViewSelectionChangedEventArgs args)
{
if (args.IsSettingsSelected() == true)
{
NavView_Navigate("settings", args.RecommendedNavigationTransitionInfo()); // Notice the 1st param is not a string. Item is better, I think.
}
else if (args.SelectedItemContainer() != NULL)
{
std::string navItemTag = args.SelectedItemContainer();
NavView_Navigate(navItemTag, args.RecommendedNavigationTransitionInfo()); // Notice the 1st param is not a string. Item is better, I think.
}
}
// This function is responsible for loading each page. The commented code below this function was the first attempt.
void MainPage::NavView_Navigate(NavigationViewItem item, NavigationTransitionInfo transitionInfo)
{
{
switch (item.Tag())
{
case "NavOperation":
NavFrame.Navigate(xaml_typename<Kcam_GUI_Test::OperationNavPage>());
break;
case "NavAdmin":
NavFrame.Navigate(xaml_typename<Kcam_GUI_Test::AdminNavPage>());
break;
case "NavAdvanced":
NavFrame.Navigate(xaml_typename<Kcam_GUI_Test::AdvancedNavPage>());
break;
case "NavFactory":
NavFrame.Navigate(xaml_typename<Kcam_GUI_Test::FactoryNavPage>());
break;
default:
break;
}
}
/*Type _page = null;
if (navItemTag == "settings")
{
_page = xaml_typename<Kcam_GUI_Test::SettingsPage>();
}
else
{
var item = _pages.FirstOrDefault(p = > p.Tag.Equals(navItemTag));
_page = item.Page;
}
// Get the page type before navigation so you can prevent duplicate
// entries in the back stack.
var preNavPageType = ContentFrame.CurrentSourcePageType;
// Only navigate if the selected page isn't currently loaded.
if (!(_page is null) && !Type.Equals(preNavPageType, _page))
{
ContentFrame.Navigate(_page, null, transitionInfo);
}*/
}
// This function is either C# or VB. It is what gets called when the page loads. It selects the first NavigationView.
void MainPage::NavView_Loaded(Windows::UI::Xaml::RoutedEventArgs e)
{
// Set the initial SelectedItem.
for each(NavigationViewItemBase item in NavView.MenuItems) // This line is wrong
{
if (item is NavigationViewItem && item.Tag.ToString() == "NavOperation") // This line is wrong
{
NavView.SelectedItem = item;
break;
}
}
}
I don't expect you to tell me the answers directly, but any known examples of how this is done in C++ would be helpful. And If you could recommend a book to purchase that would cover UWP/WinRT in C++ (NO C#), I would be very grateful. Thanks.
