/// <summary>
/// Raises the Navigating event.
/// </summary>
/// <param name="e">The data associated with the event.</param>
protected internal virtual void OnNavigating(PageNavigatingEventArgs e)
{
if (e.CanCancel && e.Canceled) {
return;
}
if (_navigatingHandler != null) {
_navigatingHandler(this, e);
}
}
private void NavigateInternal(NavigationState navigationState)
{
if (_contentView == null) {
return;
}
// TODO: False if we don't own journal and this navigation request is
// because of a browser-based back/fwd/address change gesture
bool canCancel = true;
Page currentPage = Page;
if (currentPage != null) {
PageNavigatingEventArgs e = new PageNavigatingEventArgs(canCancel);
currentPage.OnNavigating(e);
if (canCancel && e.Canceled) {
return;
}
}
NavigatingEventArgs ne = new NavigatingEventArgs(navigationState.uri, canCancel);
OnNavigating(ne);
if (canCancel && ne.Canceled) {
return;
}
Page page = _cache.GetPage(navigationState.uri);
if (page != null) {
navigationState.cachedPage = true;
Dispatcher.BeginInvoke(delegate() {
OnNavigationCompleted(navigationState, page);
});
return;
}
VisualStateManager.GoToState(this, "Navigating", /* useTransitions */ true);
InitiateNavigation(navigationState);
}
private bool NavigateInternal(NavigationState navigationState)
{
if (_contentView == null) {
return true;
}
if (_navigateResult != null) {
((NavigationState)_navigateResult.AsyncState).canceled = true;
_navigateResult = null;
}
Page currentPage = Page;
string fragment;
if (navigationState.uri.TryGetFragment(out fragment)) {
if (navigationState.uri.GetPath() == null) {
// Fragment navigation
if (currentPage != null) {
UriData currentUri = new UriData(currentPage.OriginalUri);
currentUri.SetFragment(fragment);
Uri newUri = currentUri.GetUri();
_journal.AddEntry(newUri);
_backCommand.UpdateStatus(_journal.CanGoBack);
_forwardCommand.UpdateStatus(_journal.CanGoForward);
currentPage.OnStateChanged(new PageStateEventArgs(fragment));
return true;
}
return false;
}
else {
navigationState.fragment = fragment;
navigationState.uri.SetFragment(null);
}
}
if (_redirecting == false) {
bool canCancel = !_journal.IsIntegratedWithBrowser;
if (currentPage != null) {
PageNavigatingEventArgs e = new PageNavigatingEventArgs(canCancel);
currentPage.OnNavigating(e);
if (canCancel && e.Cancel) {
return false;
}
}
NavigatingEventArgs ne = new NavigatingEventArgs(navigationState.uri.OriginalUri, canCancel);
OnNavigating(ne);
if (canCancel && ne.Cancel) {
return false;
}
}
Page page = _cache.GetPage(navigationState.uri.OriginalUri);
if (page != null) {
navigationState.cachedPage = true;
Dispatcher.BeginInvoke(delegate() {
OnNavigationCompleted(navigationState, page);
});
return true;
}
try {
IAsyncResult navigateResult = _loader.BeginLoadPage(navigationState.uri.GetUri(), Page,
OnPageLoadCallback, navigationState);
if (navigateResult.CompletedSynchronously == false) {
_navigateResult = navigateResult;
IsNavigating = true;
}
}
catch (Exception e) {
Page errorPage = GetErrorPage(e);
Dispatcher.BeginInvoke(delegate() {
OnNavigationCompleted(navigationState, errorPage);
});
}
return true;
}
private bool NavigateInternal(NavigationState navigationState)
{
if (navigationState.uri.IsAbsoluteUri == true) {
throw new ArgumentException("The URI must be a relative URI.");
}
if (_contentView == null) {
return true;
}
Page currentPage = Page;
string url = navigationState.originalUri.ToString();
int fragmentIndex = url.IndexOf('#');
if (url.Length <= fragmentIndex + 1) {
throw new ArgumentException("Invalid URL");
}
string fragment = url.Substring(fragmentIndex + 1);
if (fragmentIndex > 0) {
navigationState.fragment = fragment;
navigationState.uri = new Uri(url.Substring(0, fragmentIndex), UriKind.Relative);
}
else if (fragmentIndex == 0) {
if (currentPage != null) {
string currentUrl = currentPage.OriginalUri.ToString();
int currentFragmentIndex = currentUrl.IndexOf('#');
if (currentFragmentIndex > 0) {
currentUrl = currentUrl.Substring(0, currentFragmentIndex);
}
url = currentUrl + "#" + fragment;
_journal.AddEntry(new Uri(url, UriKind.Relative));
_backCommand.UpdateStatus(_journal.CanGoBack);
_forwardCommand.UpdateStatus(_journal.CanGoForward);
currentPage.OnStateChanged(new PageStateEventArgs(fragment));
return true;
}
return false;
}
if (_redirecting == false) {
// TODO: False if we don't own journal and this navigation request is
// because of a browser-based back/fwd/address change gesture
bool canCancel = true;
if (currentPage != null) {
PageNavigatingEventArgs e = new PageNavigatingEventArgs(canCancel);
currentPage.OnNavigating(e);
if (canCancel && e.Canceled) {
return false;
}
}
NavigatingEventArgs ne = new NavigatingEventArgs(navigationState.originalUri, canCancel);
OnNavigating(ne);
if (canCancel && ne.Canceled) {
return false;
}
}
Page page = _cache.GetPage(navigationState.originalUri);
if (page != null) {
navigationState.cachedPage = true;
Dispatcher.BeginInvoke(delegate() {
OnNavigationCompleted(navigationState, page);
});
return true;
}
if (_uriMapper != null) {
navigationState.uri = _uriMapper.MapPageUri(navigationState.uri);
}
IsNavigating = true;
try {
_navigateResult = _loader.BeginLoadPage(navigationState.uri, Page, OnPageLoadCallback, navigationState);
}
catch (Exception e) {
Page errorPage = GetErrorPage(e);
Dispatcher.BeginInvoke(delegate() {
OnNavigationCompleted(navigationState, errorPage);
});
}
return true;
}