protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
if (Element == null)
{
return;
}
int width = r - l;
int height = b - t;
_bottomBar.Measure(
MeasureSpec.MakeMeasureSpec(width, MeasureSpecMode.Exactly),
MeasureSpec.MakeMeasureSpec(height, MeasureSpecMode.AtMost));
// In order to properly layout the tabbed at the bottom, we need to re-measure the size
_bottomBar.Measure(
MeasureSpec.MakeMeasureSpec(width, MeasureSpecMode.Exactly),
MeasureSpec.MakeMeasureSpec(_bottomBar.ItemContainer.MeasuredHeight, MeasureSpecMode.Exactly));
int barHeight = _bottomBar.ItemContainer.MeasuredHeight;
if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.Lollipop)
{
_bottomBar.Layout(0, b - barHeight - 72, width, b);
}
else
{
_bottomBar.Layout(0, b - barHeight, width, b);
}
float density = Android.Content.Res.Resources.System.DisplayMetrics.Density;
double contentWidthConstraint = width / density;
double contentHeightConstraint = (height - barHeight) / density;
if (_currentPage != null)
{
var renderer = Platform.GetRenderer(_currentPage);
renderer.Element.Measure(contentWidthConstraint, contentHeightConstraint);
renderer.Element.Layout(new Rectangle(0, 0, contentWidthConstraint, contentHeightConstraint));
renderer.UpdateLayout();
}
}
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
int width = r - l;
_height = Math.Max(b - t, _height);
var context = Context;
_bottomBar.Measure(MeasureSpecFactory.MakeMeasureSpec(width, MeasureSpecMode.Exactly), MeasureSpecFactory.MakeMeasureSpec(_height, MeasureSpecMode.AtMost));
int tabsHeight = Math.Min(_height, Math.Max(_bottomBar.MeasuredHeight, _bottomBar.MinimumHeight));
if (width > 0 && _height > 0)
{
_pageController.ContainerArea = new Rectangle(0, 0, context.FromPixels(width), context.FromPixels(_frameLayout.MeasuredHeight));
ObservableCollection <Element> internalChildren = _pageController.InternalChildren;
for (int i = 0; i < internalChildren.Count; i++)
{
var bottomBarTab = _bottomBar.ItemContainer.GetChildAt(i);
var tabIcon = bottomBarTab.FindViewById <AppCompatImageView>(BottomNavigationBar.Resource.Id.bb_bottom_bar_icon);
var tabTitle = bottomBarTab.FindViewById <TextView>(BottomNavigationBar.Resource.Id.bb_bottom_bar_title);
tabTitle.ScaleX = tabIcon.ScaleX = 1f;
tabTitle.ScaleY = tabIcon.ScaleY = 1f;
tabIcon.LayoutParameters = new FrameLayout.LayoutParams(
bottomBarTab.Width / 2, bottomBarTab.Height / 2)
{
Gravity = GravityFlags.CenterHorizontal
};
bottomBarTab.SetPadding(0, 0, 0, 0);
tabIcon.SetPadding(0, 12, 0, 0);
try
{
if (i == _tabPosition)
{
tabIcon.SetColorFilter(Element.IconActiveColor.ToAndroid(), PorterDuff.Mode.SrcIn);
}
}
catch (Exception e)
{
Console.WriteLine($"--- Error: {e.StackTrace}");
}
}
_bottomBar.Measure(MeasureSpecFactory.MakeMeasureSpec(width, MeasureSpecMode.Exactly), MeasureSpecFactory.MakeMeasureSpec(tabsHeight, MeasureSpecMode.Exactly));
_bottomBar.Layout(0, 0, width, tabsHeight);
}
base.OnLayout(changed, l, t, r, b);
}
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
if (Element == null)
{
return;
}
var statusBarHeight = 0;
int resourceId = Resources.GetIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0)
{
statusBarHeight = Resources.GetDimensionPixelSize(resourceId);
}
b -= statusBarHeight;
int width = r - l;
int height = b - t;
_bottomBar.Measure(
MeasureSpec.MakeMeasureSpec(width, MeasureSpecMode.Exactly),
MeasureSpec.MakeMeasureSpec(height, MeasureSpecMode.AtMost));
// We need to call measure one more time with measured sizes
// in order to layout the bottom bar properly
_bottomBar.Measure(
MeasureSpec.MakeMeasureSpec(width, MeasureSpecMode.Exactly),
MeasureSpec.MakeMeasureSpec(_bottomBar.ItemContainer.MeasuredHeight, MeasureSpecMode.Exactly));
int barHeight = _bottomBar.ItemContainer.MeasuredHeight;
_bottomBar.Layout(0, b - barHeight, width, b);
float density = Android.Content.Res.Resources.System.DisplayMetrics.Density;
double contentWidthConstraint = width / density;
double contentHeightConstraint = (height - barHeight + statusBarHeight) / density;
if (_currentPage != null)
{
var renderer = Platform.GetRenderer(_currentPage);
renderer.Element.Measure(contentWidthConstraint, contentHeightConstraint);
renderer.Element.Layout(new Rectangle(0, 0, contentWidthConstraint, contentHeightConstraint));
renderer.UpdateLayout();
}
}
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
if (Element == null)
{
return;
}
int width = r - l;
int height = b - t;
_bottomBar.Measure(
MeasureSpec.MakeMeasureSpec(width, MeasureSpecMode.Exactly),
MeasureSpec.MakeMeasureSpec(height, MeasureSpecMode.AtMost));
// We need to call measure one more time with measured sizes
// in order to layout the bottom bar properly
_bottomBar.Measure(
MeasureSpec.MakeMeasureSpec(width, MeasureSpecMode.Exactly),
MeasureSpec.MakeMeasureSpec(_bottomBar.ItemContainer.MeasuredHeight, MeasureSpecMode.Exactly));
int barHeight = _bottomBar.ItemContainer.MeasuredHeight;
// int barHeight = 150;
_bottomBar.Layout(0, b - barHeight, width, b);
float density = Android.Content.Res.Resources.System.DisplayMetrics.Density;
double contentWidthConstraint = width / density;
double contentHeightConstraint = (height - barHeight) / density;
if (_currentPage != null)
{
try
{
var renderer = Platform.GetRenderer(_currentPage);
renderer.Element.Measure(contentWidthConstraint, contentHeightConstraint);
renderer.Element.Layout(new Rectangle(0, 0, contentWidthConstraint, contentHeightConstraint));
renderer.UpdateLayout();
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex);
}
}
}
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
int width = r - l;
int height = b - t;
var context = Context;
_bottomBar.Measure(MeasureSpecFactory.MakeMeasureSpec(width, MeasureSpecMode.Exactly), MeasureSpecFactory.MakeMeasureSpec(height, MeasureSpecMode.AtMost));
int tabsHeight = Math.Min(height, Math.Max(_bottomBar.MeasuredHeight, _bottomBar.MinimumHeight));
if (width > 0 && height > 0)
{
_pageController.ContainerArea = new Rectangle(0, 0, context.FromPixels(width), context.FromPixels(height));
_bottomBar.Measure(MeasureSpecFactory.MakeMeasureSpec(width, MeasureSpecMode.Exactly), MeasureSpecFactory.MakeMeasureSpec(tabsHeight, MeasureSpecMode.Exactly));
_bottomBar.Layout(0, 0, width, tabsHeight);
}
base.OnLayout(changed, l, t, r, b);
}
/// <summary>
/// 重写布局的方法
/// </summary>
/// <param name="changed"></param>
/// <param name="l"></param>
/// <param name="t"></param>
/// <param name="r"></param>
/// <param name="b"></param>
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
if (Element == null)
{
return;
}
int width = r - l;
int height = b - t;
_bottomBar.Measure(
MeasureSpec.MakeMeasureSpec(width, MeasureSpecMode.Exactly),
MeasureSpec.MakeMeasureSpec(height, MeasureSpecMode.AtMost));
// We need to call measure one more time with measured sizes
// in order to layout the bottom bar properly
////这里需要重新测量位置和尺寸,为了重新布置tab菜单的位置
_bottomBar.Measure(
MeasureSpec.MakeMeasureSpec(width, MeasureSpecMode.Exactly),
MeasureSpec.MakeMeasureSpec(_bottomBar.ItemContainer.MeasuredHeight, MeasureSpecMode.Exactly));
int barHeight = _bottomBar.ItemContainer.MeasuredHeight;
_bottomBar.Layout(0, b - barHeight, width, b);
float density = Resources.DisplayMetrics.Density;
double contentWidthConstraint = width / density;
double contentHeightConstraint = (height - barHeight) / density;
if (_currentPage != null)
{
var renderer = Platform.GetRenderer(_currentPage);
renderer.Element.Measure(contentWidthConstraint, contentHeightConstraint);
renderer.Element.Layout(new Rectangle(0, 0, contentWidthConstraint, contentHeightConstraint));
renderer.UpdateLayout();
}
}
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
var width = r - l;
var height = b - t;
var context = Context;
bottomBar.Measure(MeasureSpecFactory.MakeMeasureSpec(width, MeasureSpecMode.Exactly), MeasureSpecFactory.MakeMeasureSpec(height, MeasureSpecMode.AtMost));
var tabsHeight = Math.Min(height, Math.Max(bottomBar.MeasuredHeight, bottomBar.MinimumHeight));
if (width > 0 && height > 0)
{
pageController.ContainerArea = new Rectangle(0, 0, context.FromPixels(width), context.FromPixels(frameLayout.Height));
var internalChildren = pageController.InternalChildren;
foreach (var el in internalChildren)
{
var child = el as VisualElement;
if (child == null)
{
continue;
}
var renderer = Platform.GetRenderer(child);
var navigationRenderer = renderer as NavigationPageRenderer;
if (navigationRenderer != null)
{
// navigationRenderer.ContainerPadding = tabsHeight;
}
}
bottomBar.Measure(MeasureSpecFactory.MakeMeasureSpec(width, MeasureSpecMode.Exactly), MeasureSpecFactory.MakeMeasureSpec(tabsHeight, MeasureSpecMode.Exactly));
bottomBar.Layout(0, 0, width, tabsHeight);
}
base.OnLayout(changed, l, t, r, b);
}
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
if (Element == null)
{
return;
}
int width = r - l;
int height = b - t;
_bottomBar.Measure(
MeasureSpec.MakeMeasureSpec(width, MeasureSpecMode.Exactly),
MeasureSpec.MakeMeasureSpec(height, MeasureSpecMode.AtMost));
_bottomBar.Measure(
MeasureSpec.MakeMeasureSpec(width, MeasureSpecMode.Exactly),
MeasureSpec.MakeMeasureSpec(_bottomBar.ItemContainer.MeasuredHeight, MeasureSpecMode.Exactly));
int barHeight = _bottomBar.ItemContainer.MeasuredHeight;
_bottomBar.Layout(0, b - barHeight, width, b);
float density = Android.Content.Res.Resources.System.DisplayMetrics.Density;
double contentWidthConstraint = width / density;
double contentHeightConstraint = ((height - barHeight) / density);
if (_currentPage != null)
{
var renderer = Platform.GetRenderer(_currentPage);
renderer.Element.Measure(contentWidthConstraint, contentHeightConstraint);
renderer.Element.Layout(new Rectangle(0, 0, contentWidthConstraint, contentHeightConstraint));
renderer.UpdateLayout();
}
}