static void EnsureTabIndex(ExtendedTabbedPageRenderer renderer)
{
var rootLayout = (RelativeLayout)renderer.GetChildAt(0);
var bottomNav = (BottomNavigationViewEx)rootLayout.GetChildAt(1);
var menu = (BottomNavigationMenu)bottomNav.Menu;
var itemIndex = menu.FindItemIndex(bottomNav.SelectedItemId);
var pageIndex = renderer.Element.Children.IndexOf(renderer.Element.CurrentPage);
if (pageIndex >= 0 && pageIndex != itemIndex && pageIndex < bottomNav.ItemCount)
{
var menuItem = menu.GetItem(pageIndex);
bottomNav.SelectedItemId = menuItem.ItemId;
if (ExtendedTabbedPageRenderer.ShouldUpdateSelectedIcon && ExtendedTabbedPageRenderer.MenuItemIconSetter != null)
{
ExtendedTabbedPageRenderer.MenuItemIconSetter?.Invoke(menuItem, renderer.Element.CurrentPage.Icon, true);
if (renderer.LastSelectedIndex != pageIndex)
{
var lastSelectedPage = renderer.Element.Children[renderer.LastSelectedIndex];
var lastSelectedMenuItem = menu.GetItem(renderer.LastSelectedIndex);
ExtendedTabbedPageRenderer.MenuItemIconSetter?.Invoke(lastSelectedMenuItem, lastSelectedPage.Icon, false);
renderer.LastSelectedIndex = pageIndex;
}
}
}
}
public static void SwitchPage(this ExtendedTabbedPageRenderer renderer, IMenuItem item)
{
var rootLayout = (RelativeLayout)renderer.GetChildAt(0);
var bottomNav = (BottomNavigationViewEx)rootLayout.GetChildAt(1);
var menu = (BottomNavigationMenu)bottomNav.Menu;
var index = menu.FindItemIndex(item.ItemId);
var pageIndex = index % renderer.Element.Children.Count;
var currentPageIndex = renderer.Element.Children.IndexOf(renderer.Element.CurrentPage);
if (currentPageIndex != pageIndex)
{
renderer.Element.CurrentPage = renderer.Element.Children[pageIndex];
}
}
public static void Layout(this ExtendedTabbedPageRenderer renderer, int width, int height)
{
var rootLayout = (RelativeLayout)renderer.GetChildAt(0);
var bottomNav = (BottomNavigationViewEx)rootLayout.GetChildAt(1);
var Context = renderer.Context;
rootLayout.Measure(MakeMeasureSpec(width, MeasureSpecMode.Exactly),
MakeMeasureSpec(height, MeasureSpecMode.AtMost));
((IPageController)renderer.Element).ContainerArea =
Context.CreateRect(rootLayout.MeasuredWidth, rootLayout.GetChildAt(0).MeasuredHeight);
rootLayout.Measure(MakeMeasureSpec(width, MeasureSpecMode.Exactly),
MakeMeasureSpec(height, MeasureSpecMode.Exactly));
rootLayout.Layout(0, 0, rootLayout.MeasuredWidth, rootLayout.MeasuredHeight);
if (renderer.Element.Children.Count == 0)
{
return;
}
int tabsHeight = bottomNav.MeasuredHeight;
var item = (ViewGroup)bottomNav.GetChildAt(0);
item.Measure(MakeMeasureSpec(width, MeasureSpecMode.Exactly),
MakeMeasureSpec(tabsHeight, MeasureSpecMode.Exactly));
item.Layout(0, 0, width, tabsHeight);
int item_w = width / item.ChildCount;
for (int i = 0; i < item.ChildCount; i++)
{
var frame = (FrameLayout)item.GetChildAt(i);
frame.Measure(MakeMeasureSpec(item_w, MeasureSpecMode.Exactly),
MakeMeasureSpec(tabsHeight, MeasureSpecMode.Exactly));
frame.Layout(i * item_w, 0, i * item_w + item_w, tabsHeight);
}
}