protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
TabLayout tabs = _tabLayout;
FormsViewPager pager = _viewPager;
Context context = Context;
int width = r - l;
int height = b - t;
tabs.Measure(MeasureSpecFactory.MakeMeasureSpec(width, MeasureSpecMode.Exactly), MeasureSpecFactory.MakeMeasureSpec(height, MeasureSpecMode.AtMost));
var tabsHeight = 0;
if (tabs.Visibility != ViewStates.Gone)
{
//MinimumHeight is only available on API 16+
if ((int)Build.VERSION.SdkInt >= 16)
{
tabsHeight = Math.Min(height, Math.Max(tabs.MeasuredHeight, tabs.MinimumHeight));
}
else
{
tabsHeight = Math.Min(height, tabs.MeasuredHeight);
}
}
pager.Measure(MeasureSpecFactory.MakeMeasureSpec(width, MeasureSpecMode.AtMost), MeasureSpecFactory.MakeMeasureSpec(height, MeasureSpecMode.AtMost));
if (width > 0 && height > 0)
{
PageController.ContainerArea = new Rectangle(0, context.FromPixels(tabsHeight), context.FromPixels(width), context.FromPixels(height - tabsHeight));
for (var i = 0; i < PageController.InternalChildren.Count; i++)
{
var child = PageController.InternalChildren[i] as VisualElement;
if (child == null)
{
continue;
}
IVisualElementRenderer renderer = Android.Platform.GetRenderer(child);
var navigationRenderer = renderer as NavigationPageRenderer;
if (navigationRenderer != null)
{
navigationRenderer.ContainerPadding = tabsHeight;
}
}
pager.Layout(0, 0, width, b);
// We need to measure again to ensure that the tabs show up
tabs.Measure(MeasureSpecFactory.MakeMeasureSpec(width, MeasureSpecMode.Exactly), MeasureSpecFactory.MakeMeasureSpec(tabsHeight, MeasureSpecMode.Exactly));
tabs.Layout(0, 0, width, tabsHeight);
UpdateTabBarTranslation(pager.CurrentItem, 0);
}
base.OnLayout(changed, l, t, r, b);
}
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
FormsViewPager pager = _viewPager;
Context context = Context;
int width = r - l;
int height = b - t;
pager.Measure(MeasureSpecFactory.MakeMeasureSpec(width, MeasureSpecMode.AtMost), MeasureSpecFactory.MakeMeasureSpec(height, MeasureSpecMode.AtMost));
if (width > 0 && height > 0)
{
PageController.ContainerArea = new Rectangle(0, 0, context.FromPixels(width), context.FromPixels(height));
pager.Layout(0, 0, width, b);
}
base.OnLayout(changed, l, t, r, b);
}
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
FormsViewPager pager = _viewPager;
Context context = Context;
var width = r - l;
var height = b - t;
if (IsBottomTabPlacement)
{
if (width <= 0 || height <= 0)
{
return;
}
_relativeLayout.Measure(
MeasureSpec.MakeMeasureSpec(width, MeasureSpecMode.Exactly),
MeasureSpec.MakeMeasureSpec(height, MeasureSpecMode.Exactly));
pager.Measure(MeasureSpecFactory.MakeMeasureSpec(width, MeasureSpecMode.AtMost), MeasureSpecFactory.MakeMeasureSpec(height, MeasureSpecMode.AtMost));
if (width > 0 && height > 0)
{
PageController.ContainerArea = new Rectangle(0, 0, context.FromPixels(width), context.FromPixels(height - _bottomNavigationView.MeasuredHeight));
SetNavigationRendererPadding(0, _bottomNavigationView.MeasuredHeight);
pager.Layout(0, 0, width, b);
// We need to measure again to ensure that the tabs show up
_relativeLayout.Measure(
MeasureSpec.MakeMeasureSpec(width, MeasureSpecMode.Exactly),
MeasureSpec.MakeMeasureSpec(height, MeasureSpecMode.Exactly));
_relativeLayout.Layout(0, 0, _relativeLayout.MeasuredWidth, _relativeLayout.MeasuredHeight);
}
}
else
{
TabLayout tabs = _tabLayout;
tabs.Measure(MeasureSpecFactory.MakeMeasureSpec(width, MeasureSpecMode.Exactly), MeasureSpecFactory.MakeMeasureSpec(height, MeasureSpecMode.AtMost));
var tabsHeight = 0;
if (tabs.Visibility != ViewStates.Gone)
{
//MinimumHeight is only available on API 16+
if ((int)Build.VERSION.SdkInt >= 16)
{
tabsHeight = Math.Min(height, Math.Max(tabs.MeasuredHeight, tabs.MinimumHeight));
}
else
{
tabsHeight = Math.Min(height, tabs.MeasuredHeight);
}
}
pager.Measure(MeasureSpecFactory.MakeMeasureSpec(width, MeasureSpecMode.AtMost), MeasureSpecFactory.MakeMeasureSpec(height, MeasureSpecMode.AtMost));
if (width > 0 && height > 0)
{
PageController.ContainerArea = new Rectangle(0, context.FromPixels(tabsHeight), context.FromPixels(width), context.FromPixels(height - tabsHeight));
SetNavigationRendererPadding(tabsHeight, 0);
pager.Layout(0, 0, width, b);
// We need to measure again to ensure that the tabs show up
tabs.Measure(MeasureSpecFactory.MakeMeasureSpec(width, MeasureSpecMode.Exactly), MeasureSpecFactory.MakeMeasureSpec(tabsHeight, MeasureSpecMode.Exactly));
tabs.Layout(0, 0, width, tabsHeight);
UpdateTabBarTranslation(pager.CurrentItem, 0);
}
}
base.OnLayout(changed, l, t, r, b);
}
