public static BottomNavigationViewEx SetupBottomBar(this ExtendedTabbedPageRenderer renderer,
global::Android.Widget.RelativeLayout rootLayout, BottomNavigationViewEx bottomNav, int barId)
{
if (bottomNav != null)
{
rootLayout.RemoveView(bottomNav);
bottomNav.SetOnNavigationItemSelectedListener(null);
}
var barParams = new global::Android.Widget.RelativeLayout.LayoutParams(
ViewGroup.LayoutParams.MatchParent,
ExtendedTabbedPageRenderer.BottomBarHeight.HasValue ?
(int)rootLayout.Context.ToPixels(ExtendedTabbedPageRenderer.BottomBarHeight.Value) :
ViewGroup.LayoutParams.WrapContent);
barParams.AddRule(LayoutRules.AlignParentBottom);
bottomNav = new BottomNavigationViewEx(rootLayout.Context)
{
LayoutParameters = barParams,
Id = barId
};
if (ExtendedTabbedPageRenderer.BackgroundColor.HasValue)
{
bottomNav.SetBackgroundColor(ExtendedTabbedPageRenderer.BackgroundColor.Value);
}
bottomNav.SetOnNavigationItemSelectedListener(renderer);
rootLayout.AddView(bottomNav, 1, barParams);
return(bottomNav);
}
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 HandlePagesChanged(this ExtendedTabbedPageRenderer renderer)
{
renderer.SetupBottomBar();
renderer.SetupTabItems();
if (renderer.Element.Children.Count == 0)
{
return;
}
EnsureTabIndex(renderer);
}
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 SetupTabItems(this ExtendedTabbedPageRenderer renderer, BottomNavigationViewEx bottomNav)
{
var element = renderer.Element;
var menu = (BottomNavigationMenu)bottomNav.Menu;
menu.ClearAll();
var tabsCount = Math.Min(element.Children.Count, bottomNav.MaxItemCount);
for (int i = 0; i < tabsCount; i++)
{
var page = element.Children[i];
var menuItem = menu.Add(0, i, 0, page.Title);
var setter = ExtendedTabbedPageRenderer.MenuItemIconSetter ?? ExtendedTabbedPageRenderer.DefaultMenuItemIconSetter;
setter.Invoke(menuItem, page.Icon, renderer.LastSelectedIndex == i);
}
if (element.Children.Count > 0)
{
bottomNav.EnableShiftingMode(false);
bottomNav.EnableItemShiftingMode(false);
bottomNav.EnableAnimation(false);
bottomNav.SetTextVisibility(false);
bottomNav.SetBackgroundResource(Resource.Drawable.bottom_nav_bg);
bottomNav.SetIconSize(24, 24);
bottomNav.SetIconsMarginTop(32);
if (element.Children.Count > 3)
{
bottomNav.SetIconSizeAt(3, 29, 29);
bottomNav.SetIconMarginTop(3, 28);
}
var stateList = new global::Android.Content.Res.ColorStateList(
new int[][] {
new int[] { global::Android.Resource.Attribute.StateChecked },
new int[] { global::Android.Resource.Attribute.StateEnabled }
},
new int[] {
element.TintColor.ToAndroid(), // Selected
Color.FromHex("A1A1A1").ToAndroid() // Normal
});
bottomNav.ItemIconTintList = stateList;
}
}
public static RelativeLayout CreateRoot(this ExtendedTabbedPageRenderer renderer, int barId, int pageContainerId, out FrameLayout pageContainer)
{
var rootLayout = new RelativeLayout(renderer.Context)
{
LayoutParameters = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MatchParent, ViewGroup.LayoutParams.MatchParent),
};
var pageParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MatchParent, ViewGroup.LayoutParams.MatchParent);
pageParams.AddRule(LayoutRules.Above, barId);
pageContainer = new FrameLayout(renderer.Context)
{
LayoutParameters = pageParams,
Id = pageContainerId
};
rootLayout.AddView(pageContainer, 0, pageParams);
return(rootLayout);
}
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);
}
}
public static void ChangePage(this ExtendedTabbedPageRenderer renderer, FrameLayout pageContainer, Page page)
{
renderer.Context.HideKeyboard(renderer);
if (page == null)
{
return;
}
if (Platform.GetRenderer(page) == null)
{
Platform.SetRenderer(page, Platform.CreateRendererWithContext(page, renderer.Context));
}
var pageContent = Platform.GetRenderer(page).View;
pageContainer.AddView(pageContent);
if (pageContainer.ChildCount > 1)
{
pageContainer.RemoveViewAt(0);
}
EnsureTabIndex(renderer);
}