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using System;
using Android.App;
using Android.Content;
using Android.Content.Res;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Platform.Android
{
internal class MasterDetailContainer : ViewGroup
{
const int DefaultMasterSize = 320;
const int DefaultSmallMasterSize = 240;
readonly bool _isMaster;
readonly MasterDetailPage _parent;
VisualElement _childView;
public MasterDetailContainer(MasterDetailPage parent, bool isMaster, Context context) : base(context)
{
_parent = parent;
_isMaster = isMaster;
}
public MasterDetailContainer(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer) { }
IMasterDetailPageController MasterDetailPageController => _parent as IMasterDetailPageController;
public VisualElement ChildView
{
get { return _childView; }
set
{
if (_childView == value)
return;
RemoveAllViews();
if (_childView != null)
DisposeChildRenderers();
_childView = value;
if (_childView == null)
return;
AddChildView(_childView);
}
}
protected virtual void AddChildView(VisualElement childView)
{
IVisualElementRenderer renderer = Platform.GetRenderer(childView);
if (renderer == null)
Platform.SetRenderer(childView, renderer = Platform.CreateRenderer(childView));
if (renderer.View.Parent != this)
{
if (renderer.View.Parent != null)
renderer.View.RemoveFromParent();
SetDefaultBackgroundColor(renderer);
AddView(renderer.View);
renderer.UpdateLayout();
}
}
public int TopPadding { get; set; }
double DefaultWidthMaster
{
get
{
double w = Context.FromPixels(Resources.DisplayMetrics.WidthPixels);
return w < DefaultSmallMasterSize ? w : (w < DefaultMasterSize ? DefaultSmallMasterSize : DefaultMasterSize);
}
}
public override bool OnInterceptTouchEvent(MotionEvent ev)
{
bool isShowingPopover = _parent.IsPresented && !MasterDetailPageController.ShouldShowSplitMode;
if (!_isMaster && isShowingPopover)
return true;
return base.OnInterceptTouchEvent(ev);
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
RemoveAllViews();
DisposeChildRenderers();
}
base.Dispose(disposing);
}
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
if (_childView == null)
return;
Rectangle bounds = GetBounds(_isMaster, l, t, r, b);
if (_isMaster)
MasterDetailPageController.MasterBounds = bounds;
else
MasterDetailPageController.DetailBounds = bounds;
IVisualElementRenderer renderer = Platform.GetRenderer(_childView);
renderer?.UpdateLayout();
}
void DisposeChildRenderers()
{
IVisualElementRenderer childRenderer = Platform.GetRenderer(_childView);
if (childRenderer != null)
childRenderer.Dispose();
_childView.ClearValue(Platform.RendererProperty);
}
Rectangle GetBounds(bool isMasterPage, int left, int top, int right, int bottom)
{
double width = Context.FromPixels(right - left);
double height = Context.FromPixels(bottom - top);
double xPos = 0;
bool supressPadding = false;
//splitview
if (MasterDetailPageController.ShouldShowSplitMode)
{
//to keep some behavior we have on iPad where you can toggle and it won't do anything
bool isDefaultNoToggle = _parent.MasterBehavior == MasterBehavior.Default;
xPos = isMasterPage ? 0 : (_parent.IsPresented || isDefaultNoToggle ? DefaultWidthMaster : 0);
width = isMasterPage ? DefaultWidthMaster : _parent.IsPresented || isDefaultNoToggle ? width - DefaultWidthMaster : width;
}
else
{
//if we are showing the normal popover master doesn't have padding
supressPadding = isMasterPage;
//popover make the master smaller
width = isMasterPage && (Device.Info.CurrentOrientation.IsLandscape() || Device.Idiom == TargetIdiom.Tablet) ? DefaultWidthMaster : width;
}
double padding = supressPadding ? 0 : Context.FromPixels(TopPadding);
return new Rectangle(xPos, padding, width, height - padding);
}
protected void SetDefaultBackgroundColor(IVisualElementRenderer renderer)
{
if (ChildView.BackgroundColor == Color.Default)
{
TypedArray colors = Context.Theme.ObtainStyledAttributes(new[] { global::Android.Resource.Attribute.ColorBackground });
renderer.View.SetBackgroundColor(new global::Android.Graphics.Color(colors.GetColor(0, 0)));
}
}
}
}
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