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using System;
using System.ComponentModel;
using System.Linq;
using Android.Content;
using Android.Graphics;
using Android.Views;
using Android.Widget;
using AView = Android.Views.View;
namespace Xamarin.Forms.Platform.Android
{
public sealed class NavigationMenuRenderer : ViewRenderer
{
public NavigationMenuRenderer()
{
AutoPackage = false;
}
GridView GridView
{
get { return Control as GridView; }
}
NavigationMenu NavigationMenu
{
get { return Element as NavigationMenu; }
}
protected override void OnElementChanged(ElementChangedEventArgs<View> e)
{
base.OnElementChanged(e);
if (e.OldElement == null)
{
var grid = new GridView(Context);
grid.SetVerticalSpacing(20);
SetNativeControl(grid);
}
UpdateTargets();
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
switch (e.PropertyName)
{
case "Targets":
UpdateTargets();
break;
}
}
protected override void OnSizeChanged(int w, int h, int oldw, int oldh)
{
GridView.NumColumns = w > h ? 3 : 2;
base.OnSizeChanged(w, h, oldw, oldh);
}
void UpdateTargets()
{
GridView.Adapter = new MenuAdapter(NavigationMenu);
}
class MenuElementView : LinearLayout
{
readonly ImageButton _image;
readonly TextView _label;
string _icon;
public MenuElementView(Context context) : base(context)
{
Orientation = Orientation.Vertical;
_image = new ImageButton(context);
_image.SetScaleType(ImageView.ScaleType.FitCenter);
_image.Click += (object sender, EventArgs e) =>
{
if (OnSelected != null)
OnSelected();
};
AddView(_image, new LayoutParams(ViewGroup.LayoutParams.WrapContent, ViewGroup.LayoutParams.WrapContent) { Gravity = GravityFlags.Center });
_label = new TextView(context) { TextAlignment = global::Android.Views.TextAlignment.Center, Gravity = GravityFlags.Center };
AddView(_label, new LayoutParams(ViewGroup.LayoutParams.MatchParent, ViewGroup.LayoutParams.WrapContent));
}
public string Icon
{
get { return _icon; }
set
{
_icon = value;
Bitmap bitmap = Context.Resources.GetBitmap(_icon);
_image.SetImageBitmap(bitmap);
}
}
public string Name
{
get { return _label.Text; }
set { _label.Text = value; }
}
public Action OnSelected { get; set; }
}
class MenuAdapter : BaseAdapter<Page>
{
readonly NavigationMenu _menu;
public MenuAdapter(NavigationMenu menu)
{
_menu = menu;
}
#region implemented abstract members of BaseAdapter
public override Page this[int index]
{
get { return _menu.Targets.ElementAtOrDefault(index); }
}
#endregion
public override AView GetView(int position, AView convertView, ViewGroup parent)
{
MenuElementView menuItem = convertView as MenuElementView ?? new MenuElementView(parent.Context);
Page item = this[position];
menuItem.Icon = item.Icon;
menuItem.Name = item.Title;
menuItem.OnSelected = () => _menu.SendTargetSelected(item);
return menuItem;
}
#region implemented abstract members of BaseAdapter
public override long GetItemId(int position)
{
return 0;
}
public override int Count
{
get { return _menu.Targets.Count(); }
}
#endregion
}
}
}
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