private protected override void OnLoaded()
{
base.OnLoaded();
// TODO: Find a proper way to decide whether a CommandBar exists on canvas (within Page), or is mapped to the UINavigationController's NavigationBar.
CommandBar?commandBar = null;
_commandBar?.TryGetTarget(out commandBar);
if (_commandBar == null)
{
commandBar = TemplatedParent as CommandBar;
_commandBar = new WeakReference <CommandBar?>(commandBar);
_navigationBar = commandBar?.GetRenderer(RendererFactory).Native;
}
else
{
_navigationBar = commandBar?.ResetRenderer(RendererFactory).Native;
}
if (_navigationBar == null)
{
throw new InvalidOperationException("No NavigationBar from renderer");
}
_navigationBar.SetNeedsLayout();
var navigationBarSuperview = _navigationBar?.Superview;
// Allows the UINavigationController's NavigationBar instance to be moved to the Page. This feature
// is used in the context of the sample application to test NavigationBars outside of a NativeFramePresenter for
// UI Testing. In general cases, this should not happen as the bar may be moved back to to this presenter while
// another page is already visible, making this bar overlay on top of another.
if (FeatureConfiguration.CommandBar.AllowNativePresenterContent && (navigationBarSuperview == null || navigationBarSuperview is NativeCommandBarPresenter))
{
Content = _navigationBar;
}
var statusBar = StatusBar.GetForCurrentView();
statusBar.Showing += OnStatusBarChanged;
statusBar.Hiding += OnStatusBarChanged;
_statusBarSubscription.Disposable = Disposable.Create(() =>
{
statusBar.Showing -= OnStatusBarChanged;
statusBar.Hiding -= OnStatusBarChanged;
});
// iOS doesn't automatically update the navigation bar position when the status bar visibility changes.
void OnStatusBarChanged(StatusBar sender, object args)
{
_navigationBar !.SetNeedsLayout();
_navigationBar !.Superview.SetNeedsLayout();
}
}
public override void SetNeedsLayout()
{
base.SetNeedsLayout();
_requiresMeasure = true;
if (Superview != null)
{
Superview.SetNeedsLayout();
}
}
public void RemoveFromSuperview()
{
if (Superview == null)
{
throw new InvalidOperationException("The View does not have a Superview");
}
Superview._subviews.Remove(this);
Superview.SetNeedsLayout();
}
private protected override void OnLoaded()
{
base.OnLoaded();
// TODO: Find a proper way to decide whether a CommandBar exists on canvas (within Page), or is mapped to the UINavigationController's NavigationBar.
var commandBar = _commandBar?.Target;
if (commandBar == null)
{
commandBar = TemplatedParent as CommandBar;
_commandBar = new WeakReference <CommandBar?>(commandBar);
_navigationBar = commandBar?.GetRenderer(RendererFactory).Native;
}
else
{
_navigationBar = commandBar?.ResetRenderer(RendererFactory).Native;
}
if (_navigationBar == null)
{
throw new InvalidOperationException("No NavigationBar from renderer");
}
_navigationBar.SetNeedsLayout();
var navigationBarSuperview = _navigationBar?.Superview;
if (navigationBarSuperview == null || navigationBarSuperview is NativeCommandBarPresenter) // Prevents the UINavigationController's NavigationBar instance from being moved to the Page
{
Content = _navigationBar;
}
var statusBar = StatusBar.GetForCurrentView();
statusBar.Showing += OnStatusBarChanged;
statusBar.Hiding += OnStatusBarChanged;
_statusBarSubscription.Disposable = Disposable.Create(() =>
{
statusBar.Showing -= OnStatusBarChanged;
statusBar.Hiding -= OnStatusBarChanged;
});
// iOS doesn't automatically update the navigation bar position when the status bar visibility changes.
void OnStatusBarChanged(StatusBar sender, object args)
{
_navigationBar !.SetNeedsLayout();
_navigationBar !.Superview.SetNeedsLayout();
}
}
private void OnContentChanged(UIElement oldValue, UIElement newValue)
{
if (oldValue != null)
{
oldValue.RemoveFromSuperview();
}
if (newValue != null)
{
AddSubview(newValue);
}
Superview?.SetNeedsLayout();
}
public override void InvalidateIntrinsicContentSize()
{
base.InvalidateIntrinsicContentSize();
if (Frame.Width == 0 && Frame.Height == 0)
{
// The Label hasn't actually been laid out on screen yet; no reason to request a layout
return;
}
if (!Frame.Size.IsCloseTo(AddInsets(IntrinsicContentSize), (nfloat)0.001))
{
// The text or its attributes have changed enough that the size no longer matches the set Frame. It's possible
// that the Label needs to be laid out again at a different size, so we request that the parent do so.
Superview?.SetNeedsLayout();
}
}
public override void WillRemoveSubview(UIView uiview)
{
base.WillRemoveSubview(uiview);
Superview?.SetNeedsLayout();
}
public override void SubviewAdded(UIView uiview)
{
base.SubviewAdded(uiview);
Superview?.SetNeedsLayout();
}
public override void SetNeedsLayout()
{
base.SetNeedsLayout();
Superview?.SetNeedsLayout();
}
public override void SetTitle(string title, UIControlState forState)
{
base.SetTitle(title, forState);
Superview.SetNeedsLayout();
Layer.CornerRadius = Layer.Frame.Height / 2;
}