/// <include file="../../../docs/Microsoft.Maui.Controls/ShellNavigatingEventArgs.xml" path="//Member[@MemberName='.ctor']/Docs" />
public ShellNavigatingEventArgs(ShellNavigationState current, ShellNavigationState target, ShellNavigationSource source, bool canCancel)
{
_deferralFinishedTask = () => Task.CompletedTask;
Current = current;
Target = target;
Source = source;
CanCancel = canCancel;
Animate = true;
}
public async Task GoTo(MC.ShellNavigationState state, bool animate = true)
{
if (state is null)
{
throw new ArgumentNullException(nameof(state));
}
await NativeControl.GoToAsync(state, animate).ConfigureAwait(true);
}
public Task GoToAsync(ShellNavigationState state, bool?animate, bool enableRelativeShellRoutes, ShellNavigatingEventArgs deferredArgs = null)
{
return(GoToAsync(new ShellNavigationParameters
{
TargetState = state,
Animated = animate,
EnableRelativeShellRoutes = enableRelativeShellRoutes,
DeferredArgs = deferredArgs
}));
}
/// <include file="../../../docs/Microsoft.Maui.Controls/ShellNavigatingEventArgs.xml" path="//Member[@MemberName='.ctor']/Docs" />
public ShellNavigatingEventArgs(ShellNavigationState current, ShellNavigationState target, ShellNavigationSource source, bool canCancel)
{
#if !NETSTANDARD1_0
_deferralFinishedTask = () => Task.CompletedTask;
#else
_deferralFinishedTask = () => Task.Delay(0);
#endif
Current = current;
Target = target;
Source = source;
CanCancel = canCancel;
Animate = true;
}
ShellNavigatingEventArgs ProposeNavigation(
ShellNavigationSource source,
ShellNavigationState proposedState,
bool canCancel,
bool isAnimated)
{
if (AccumulateNavigatedEvents)
{
return(null);
}
var navArgs = new ShellNavigatingEventArgs(_shell.CurrentState, proposedState, source, canCancel)
{
Animate = isAnimated
};
HandleNavigating(navArgs);
return(navArgs);
}
public static ShellNavigationSource CalculateNavigationSource(Shell shell, ShellNavigationState current, ShellNavigationRequest request)
{
if (request.StackRequest == ShellNavigationRequest.WhatToDoWithTheStack.PushToIt)
{
return(ShellNavigationSource.Push);
}
if (current == null)
{
return(ShellNavigationSource.ShellItemChanged);
}
var targetUri = ShellUriHandler.ConvertToStandardFormat(shell, request.Request.FullUri);
var currentUri = ShellUriHandler.ConvertToStandardFormat(shell, current.FullLocation);
var targetPaths = ShellUriHandler.RetrievePaths(targetUri.PathAndQuery);
var currentPaths = ShellUriHandler.RetrievePaths(currentUri.PathAndQuery);
var targetPathsLength = targetPaths.Length;
var currentPathsLength = currentPaths.Length;
if (targetPathsLength < 4 || currentPathsLength < 4)
{
return(ShellNavigationSource.Unknown);
}
if (targetPaths[1] != currentPaths[1])
{
return(ShellNavigationSource.ShellItemChanged);
}
if (targetPaths[2] != currentPaths[2])
{
return(ShellNavigationSource.ShellSectionChanged);
}
if (targetPaths[3] != currentPaths[3])
{
return(ShellNavigationSource.ShellContentChanged);
}
if (targetPathsLength == currentPathsLength)
{
return(ShellNavigationSource.Unknown);
}
if (targetPathsLength < currentPathsLength)
{
for (var i = 0; i < targetPathsLength; i++)
{
var targetPath = targetPaths[i];
if (targetPath != currentPaths[i])
{
break;
}
if (i == targetPathsLength - 1)
{
if (targetPathsLength == 4)
{
return(ShellNavigationSource.PopToRoot);
}
return(ShellNavigationSource.Pop);
}
}
if (targetPaths[targetPathsLength - 1] == currentPaths[currentPathsLength - 1])
{
return(ShellNavigationSource.Remove);
}
if (targetPathsLength == 4)
{
return(ShellNavigationSource.PopToRoot);
}
return(ShellNavigationSource.Pop);
}
else if (targetPathsLength > currentPathsLength)
{
for (var i = 0; i < currentPathsLength; i++)
{
if (targetPaths[i] != currentPaths[i])
{
break;
}
if (i == targetPathsLength - 1)
{
return(ShellNavigationSource.Push);
}
}
}
if (targetPaths[targetPathsLength - 1] == currentPaths[currentPathsLength - 1])
{
return(ShellNavigationSource.Insert);
}
return(ShellNavigationSource.Push);
}
public ShellNavigatedEventArgs(ShellNavigationState previous, ShellNavigationState current, ShellNavigationSource source)
{
Previous = previous;
Current = current;
Source = source;
}
