async Task PopModalInternal(bool animated)
{
TaskCompletionSource <bool> tcs = null;
if (CurrentModalNavigationTask != null && !CurrentModalNavigationTask.IsCompleted)
{
var previousTask = CurrentModalNavigationTask;
tcs = new TaskCompletionSource <bool>();
CurrentModalNavigationTask = tcs.Task;
await previousTask;
}
if (animated)
{
InternalNaviframe.Pop();
}
else
{
InternalNaviframe.NavigationStack.LastOrDefault()?.Delete();
}
bool shouldWait = animated && (InternalNaviframe.NavigationStack.Count != 0);
await WaitForCompletion(shouldWait, tcs);
}
async Task PushModalInternal(Page modal, bool animated)
{
TaskCompletionSource <bool> tcs = null;
if (CurrentModalNavigationTask != null && !CurrentModalNavigationTask.IsCompleted)
{
var previousTask = CurrentModalNavigationTask;
tcs = new TaskCompletionSource <bool>();
CurrentModalNavigationTask = tcs.Task;
await previousTask;
}
var after = InternalNaviframe.NavigationStack.LastOrDefault();
NaviItem pushed = null;
if (animated || after == null)
{
pushed = InternalNaviframe.Push(Platform.GetOrCreateRenderer(modal).NativeView, modal.Title);
}
else
{
pushed = InternalNaviframe.InsertAfter(after, Platform.GetOrCreateRenderer(modal).NativeView, modal.Title);
}
pushed.TitleBarVisible = false;
bool shouldWait = animated && after != null;
await WaitForCompletion(shouldWait, tcs);
}
protected virtual void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
if (disposing)
{
SetPage(null);
InternalNaviframe.Unrealize();
}
_disposed = true;
}
public void SetPage(Page newRoot)
{
if (Page != null)
{
var copyOfStack = new List <NaviItem>(InternalNaviframe.NavigationStack);
for (var i = 0; i < copyOfStack.Count; i++)
{
copyOfStack[i].Delete();
}
foreach (Page page in _navModel.Roots)
{
var renderer = GetRenderer(page);
(page as IPageController)?.SendDisappearing();
renderer?.Dispose();
}
_navModel = new NavigationModel();
}
if (newRoot == null)
{
return;
}
_navModel.Push(newRoot, null);
Page = newRoot;
Page.Platform = this;
IVisualElementRenderer pageRenderer = AttachRenderer(Page);
var naviItem = InternalNaviframe.Push(pageRenderer.NativeView);
naviItem.TitleBarVisible = false;
// Make naviitem transparent if parent window is transparent.
// Make sure that this is only for _navModel._naviTree. (not for _navModel._modalStack)
// In addtion, the style of naviItem is only decided before the naviItem pushed into Naviframe. (not on-demand).
if (HasAlpha)
{
naviItem.Style = "default/transparent";
}
((Application)Page.RealParent).NavigationProxy.Inner = this;
Device.StartTimer(TimeSpan.Zero, () =>
{
CurrentPageController?.SendAppearing();
return(false);
});
}
