internal static async void SetMasterLeftBarButton(UIViewController containerController, MasterDetailPage masterDetailPage)
{
if (!masterDetailPage.ShouldShowToolbarButton())
{
containerController.NavigationItem.LeftBarButtonItem = null;
return;
}
EventHandler handler = (o, e) => masterDetailPage.IsPresented = !masterDetailPage.IsPresented;
bool shouldUseIcon = masterDetailPage.Master.Icon != null;
if (shouldUseIcon)
{
try
{
var source = Internals.Registrar.Registered.GetHandler <IImageSourceHandler>(masterDetailPage.Master.Icon.GetType());
var icon = await source.LoadImageAsync(masterDetailPage.Master.Icon);
containerController.NavigationItem.LeftBarButtonItem = new UIBarButtonItem(icon, UIBarButtonItemStyle.Plain, handler);
}
catch (Exception)
{
// Throws Exception otherwise would catch more specific exception type
shouldUseIcon = false;
}
}
if (!shouldUseIcon)
{
containerController.NavigationItem.LeftBarButtonItem = new UIBarButtonItem(masterDetailPage.Master.Title, UIBarButtonItemStyle.Plain, handler);
}
}
internal static void SetMasterLeftBarButton(UIViewController containerController, MasterDetailPage masterDetailPage)
{
if (!masterDetailPage.ShouldShowToolbarButton())
{
containerController.NavigationItem.LeftBarButtonItem = null;
return;
}
EventHandler handler = (o, e) => masterDetailPage.IsPresented = !masterDetailPage.IsPresented;
bool shouldUseIcon = masterDetailPage.Master.Icon != null;
if (shouldUseIcon)
{
try
{
containerController.NavigationItem.LeftBarButtonItem = new UIBarButtonItem(new UIImage(masterDetailPage.Master.Icon), UIBarButtonItemStyle.Plain, handler);
}
catch (Exception)
{
// Throws Exception otherwise would catch more specific exception type
shouldUseIcon = false;
}
}
if (!shouldUseIcon)
{
containerController.NavigationItem.LeftBarButtonItem = new UIBarButtonItem(masterDetailPage.Master.Title, UIBarButtonItemStyle.Plain, handler);
}
}
void UpdateLeftBarButtonItem(ParentingViewController containerController, Page pageBeingRemoved = null)
{
if (containerController == null)
{
return;
}
var currentChild = containerController.Child;
var firstPage = ((INavigationPageController)Element).Pages.FirstOrDefault();
if ((firstPage != pageBeingRemoved && currentChild != firstPage && NavigationPage.GetHasBackButton(currentChild)) || _parentMasterDetailPage == null)
{
return;
}
if (!_parentMasterDetailPage.ShouldShowToolbarButton())
{
containerController.NavigationItem.LeftBarButtonItem = null;
return;
}
var shouldUseIcon = _parentMasterDetailPage.Master.Icon != null;
if (shouldUseIcon)
{
try
{
containerController.NavigationItem.LeftBarButtonItem =
new UIBarButtonItem(new UIImage(_parentMasterDetailPage.Master.Icon), UIBarButtonItemStyle.Plain,
(o, e) => _parentMasterDetailPage.IsPresented = !_parentMasterDetailPage.IsPresented);
}
catch (Exception)
{
// Throws Exception otherwise would catch more specific exception type
shouldUseIcon = false;
}
}
if (!shouldUseIcon)
{
containerController.NavigationItem.LeftBarButtonItem = new UIBarButtonItem(_parentMasterDetailPage.Master.Title,
UIBarButtonItemStyle.Plain,
(o, e) => _parentMasterDetailPage.IsPresented = !_parentMasterDetailPage.IsPresented);
}
}
void UpdateToolbarItems()
{
if (_page.ApplicationBar == null)
{
_page.ApplicationBar = new ApplicationBar();
}
ToolbarItem[] items = _tracker.ToolbarItems.ToArray();
MasterDetailPage masterDetail = _tracker.Target.Descendants().Prepend(_tracker.Target).OfType <MasterDetailPage>().FirstOrDefault();
TaggedAppBarButton oldMasterDetailButton = _page.ApplicationBar.Buttons.OfType <TaggedAppBarButton>().FirstOrDefault(b => b.Tag is MasterDetailPage && b.Tag != masterDetail);
if (oldMasterDetailButton != null)
{
_page.ApplicationBar.Buttons.Remove(oldMasterDetailButton);
}
if (masterDetail != null)
{
if (masterDetail.ShouldShowToolbarButton())
{
if (_page.ApplicationBar.Buttons.OfType <TaggedAppBarButton>().All(b => b.Tag != masterDetail))
{
var button = new TaggedAppBarButton
{
IconUri = new Uri(masterDetail.Master.Icon ?? "ApplicationIcon.jpg", UriKind.Relative),
Text = masterDetail.Master.Title,
IsEnabled = true,
Tag = masterDetail
};
button.Click += (sender, args) =>
{
var masterDetailRenderer = GetRenderer(masterDetail) as MasterDetailRenderer;
if (masterDetailRenderer != null)
{
masterDetailRenderer.Toggle();
}
};
_page.ApplicationBar.Buttons.Add(button);
}
}
}
var buttonsToAdd = new List <TaggedAppBarButton>();
foreach (ToolbarItem item in items.Where(i => i.Order != ToolbarItemOrder.Secondary))
{
IMenuItemController controller = item;
if (_page.ApplicationBar.Buttons.OfType <TaggedAppBarButton>().Any(b => b.Tag == item))
{
continue;
}
var button = new TaggedAppBarButton
{
IconUri = new Uri(item.Icon ?? "ApplicationIcon.jpg", UriKind.Relative),
Text = !string.IsNullOrWhiteSpace(item.Text) ? item.Text : (string)item.Icon ?? "ApplicationIcon.jpg",
IsEnabled = controller.IsEnabled,
Tag = item
};
button.Click += (sender, args) => controller.Activate();
buttonsToAdd.Add(button);
}
var menuItemsToAdd = new List <TaggedAppBarMenuItem>();
foreach (ToolbarItem item in items.Where(i => i.Order == ToolbarItemOrder.Secondary))
{
if (_page.ApplicationBar.MenuItems.OfType <TaggedAppBarMenuItem>().Any(b => b.Tag == item))
{
continue;
}
var button = new TaggedAppBarMenuItem {
Text = !string.IsNullOrWhiteSpace(item.Text) ? item.Text : (string)item.Icon ?? "MenuItem", IsEnabled = true, Tag = item
};
button.Click += (sender, args) => ((IMenuItemController)item).Activate();
menuItemsToAdd.Add(button);
}
TaggedAppBarButton[] deadButtons = _page.ApplicationBar.Buttons.OfType <TaggedAppBarButton>().Where(b => b.Tag is ToolbarItem && !items.Contains(b.Tag)).ToArray();
TaggedAppBarMenuItem[] deadMenuItems = _page.ApplicationBar.MenuItems.OfType <TaggedAppBarMenuItem>().Where(b => b.Tag is ToolbarItem && !items.Contains(b.Tag)).ToArray();
// we must remove the dead buttons before adding the new ones so we don't accidentally go over the limit during the transition
foreach (TaggedAppBarButton deadButton in deadButtons)
{
deadButton.Dispose();
_page.ApplicationBar.Buttons.Remove(deadButton);
}
foreach (TaggedAppBarMenuItem deadMenuItem in deadMenuItems)
{
_page.ApplicationBar.MenuItems.Remove(deadMenuItem);
}
// fixme, insert in order
foreach (TaggedAppBarButton newButton in buttonsToAdd)
{
_page.ApplicationBar.Buttons.Add(newButton);
}
foreach (TaggedAppBarMenuItem newMenuItem in menuItemsToAdd)
{
_page.ApplicationBar.MenuItems.Add(newMenuItem);
}
_page.ApplicationBar.IsVisible = _page.ApplicationBar.Buttons.Count > 0 || _page.ApplicationBar.MenuItems.Count > 0;
}
