private void OnSourceChanged(Uri oldValue, Uri newValue)
{
// if resetting source or old source equals new, don't do anything
if (this.isResetSource || newValue != null && newValue.Equals(oldValue))
{
return;
}
// handle fragment navigation
string newFragment = null;
var oldValueNoFragment = NavigationHelper.RemoveFragment(oldValue);
var newValueNoFragment = NavigationHelper.RemoveFragment(newValue, out newFragment);
if (newValueNoFragment != null && newValueNoFragment.Equals(oldValueNoFragment))
{
// fragment navigation
var args = new FragmentNavigationEventArgs {
Fragment = newFragment
};
OnFragmentNavigation(this.Content as IContent, args);
}
else
{
var navType = this.isNavigatingHistory ? NavigationType.Back : NavigationType.New;
// only invoke CanNavigate for new navigation
if (!this.isNavigatingHistory && !CanNavigate(oldValue, newValue, navType))
{
return;
}
Navigate(oldValue, newValue, navType);
}
}
private void OnFragmentNavigation(IContent content, FragmentNavigationEventArgs e)
{
// invoke optional IContent.OnFragmentNavigation
if (content != null)
{
content.OnFragmentNavigation(e);
}
// raise the FragmentNavigation event
if (FragmentNavigation != null)
{
FragmentNavigation(this, e);
}
}
private void SetContent(Uri newSource, NavigationType navigationType, object newContent, bool contentIsError)
{
var oldContent = this.Content as IContent;
// assign content
this.Content = newContent;
// do not raise navigated event when error
if (!contentIsError)
{
var args = new NavigationEventArgs {
Frame = this,
Source = newSource,
Content = newContent,
NavigationType = navigationType
};
OnNavigated(oldContent, newContent as IContent, args);
}
// set IsLoadingContent to false
SetValue(IsLoadingContentPropertyKey, false);
if (!contentIsError)
{
// and raise optional fragment navigation events
string fragment;
NavigationHelper.RemoveFragment(newSource, out fragment);
if (fragment != null)
{
// fragment navigation
var fragmentArgs = new FragmentNavigationEventArgs {
Fragment = fragment
};
OnFragmentNavigation(newContent as IContent, fragmentArgs);
}
}
}