private void EnsureBindings(object itemObject)
{
if (itemDataBindings == null && !itemIsViewModel.HasValue)
{
itemIsViewModel = itemObject is ViewModelBase;
if (!itemIsViewModel.Value)
{
itemDataBindings = new List <ItemDataBinding>();
Type itemType = itemObject.GetType();
foreach (var pi in itemType.GetProperties(BindingFlags.Public | BindingFlags.Instance))
{
var resourceId = AndroidHelpers.FindResourceId(IdName(pi.Name));
if (resourceId.HasValue)
{
itemDataBindings.Add(new ItemDataBinding(pi, resourceId.Value));
}
}
foreach (var fi in itemType.GetFields(BindingFlags.Public | BindingFlags.Instance))
{
var resourceId = AndroidHelpers.FindResourceId(IdName(fi.Name));
if (resourceId.HasValue)
{
itemDataBindings.Add(new ItemDataBinding(fi, resourceId.Value));
}
}
}
}
}
protected override void OnResume()
{
base.OnResume();
AndroidHelpers.SetCurrentActivity(this);
EnsureHandlersAreAdded();
}
protected override void OnPause()
{
EnsureHandlersAreRemoved();
AndroidHelpers.ClearActivityReference(this);
base.OnPause();
}
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
AndroidHelpers.SetCurrentActivity(this);
}
private DataBinding AddBinding(string propertyName, BindingMode mode = BindingMode.OneWay, string listPropertyName = null, View view = null, AdapterView commandParameterSelectedItemAdapterView = null)
{
string idName = (view != null) ? view.Id.ToString() : IdName(propertyName);
int? resourceId = AndroidHelpers.FindResourceId(idName);
if (view == null && resourceId.HasValue)
{
view = rootView.FindViewById(resourceId.Value);
}
if (view == null)
{
return(null);
}
bool itemIsValue = false;
string itemTemplateName = null, itemValueId = null;
int? commandParameterListId = null;
if (view.Tag != null)
{
// Get optional parameters from tag:
// {Binding propertyName, Mode=OneWay|TwoWay|Command}
// {List ItemsSource=listPropertyName, ItemIsValue=false|true, ItemTemplate=listItemTemplateName, ItemValueId=listItemValueId}
// {CommandParameter ListId=<view Id>}
// Defaults:
// propertyName is known by convention from view Id = <rootview prefix><propertyName>; the default for the rootview prefix is the rootview class name + "_".
// Mode = OneWay
// Additional defaults for views derived from AdapterView (i.e. lists):
// ItemsSource = propertyName + "List"
// ItemIsValue = false
// ItemTemplate = ItemsSource + "Item"
// ItemValueId : if ItemIsValue = true then the default for ItemValueId = ItemTemplate
string tag = view.Tag.ToString();
if (tag != null && tag.Contains("{"))
{
var match = Regex.Match(tag, @"({Binding\s+((?<assignment>[^,{}]+),?)+\s*})?(\s*{List\s+((?<assignment>[^,{}]+),?)+\s*})?(\s*{CommandParameter\s+((?<assignment>[^,{}]+),?)+\s*})?");
if (match.Success)
{
var gc = match.Groups["assignment"];
if (gc != null)
{
var cc = gc.Captures;
if (cc != null)
{
for (int i = 0; i < cc.Count; i++)
{
string[] assignmentElements = cc[i].Value.Split('=');
if (assignmentElements.Length == 1)
{
string value = assignmentElements[0].Trim();
if (value != "")
{
propertyName = value;
}
}
else if (assignmentElements.Length == 2)
{
string name = assignmentElements[0].Trim();
string value = assignmentElements[1].Trim();
switch (name)
{
case "Mode": Enum.TryParse <BindingMode>(value, true, out mode); break;
case "ItemsSource": listPropertyName = value; break;
case "ItemIsValue": Boolean.TryParse(value, out itemIsValue); break;
case "ItemTemplate": itemTemplateName = value; break;
case "ItemValueId": itemValueId = value; break;
case "ListId":
commandParameterListId = AndroidHelpers.FindResourceId(value);
if (commandParameterSelectedItemAdapterView == null && commandParameterListId.HasValue)
{
commandParameterSelectedItemAdapterView = rootView.FindViewById <AdapterView>(commandParameterListId.Value);
}
break;
default: throw new ArgumentException("Unknown tag binding parameter: " + name);
}
}
}
}
}
}
}
}
var binding = new DataBinding
{
View = view,
ResourceId = resourceId,
Mode = mode,
ViewModelPropertyInfo = viewModel.GetType().GetProperty(propertyName),
CommandParameterListId = commandParameterListId,
CommandParameterListView = commandParameterSelectedItemAdapterView
};
if (binding.View is AdapterView)
{
if (listPropertyName == null)
{
listPropertyName = propertyName + "List";
}
var pi = viewModel.GetType().GetProperty(listPropertyName);
if (pi == null && binding.ViewModelPropertyInfo.PropertyType.GetInterface("IList") != null)
{
listPropertyName = propertyName;
pi = binding.ViewModelPropertyInfo;
binding.ViewModelPropertyInfo = null;
}
binding.ViewModelListPropertyInfo = pi;
pi = binding.View.GetType().GetProperty("Adapter", BindingFlags.Public | BindingFlags.Instance);
if (pi != null)
{
var adapter = pi.GetValue(binding.View);
if (adapter == null)
{
if (itemTemplateName == null)
{
itemTemplateName = listPropertyName + "Item";
}
if (itemIsValue && itemValueId == null)
{
itemValueId = itemTemplateName;
}
int?itemTemplateResourceId = AndroidHelpers.FindResourceId(itemTemplateName, AndroidHelpers.ResourceCategory.Layout);
int?itemValueResourceId = AndroidHelpers.FindResourceId(itemValueId);
if (itemTemplateResourceId.HasValue)
{
adapter = new DataBindableListAdapter <object>(layoutInflater, itemTemplateResourceId.Value, itemTemplateName + "_", itemValueResourceId, rootViewExtensionPoints);
pi.SetValue(binding.View, adapter);
}
}
binding.ListAdapter = adapter as IDataBindableListAdapter;
}
}
switch (binding.Mode)
{
case BindingMode.TwoWay: AddTwoWayHandler(binding); break;
case BindingMode.Command: AddCommandHandler(binding); break;
}
dataBindings.Add(idName, binding);
return(binding);
}
private DataBinding AddBinding(BindingParameters bp)
{
object view = bp.View;
View androidView = view as View;
string propertyName = bp.ViewModelPropertyName;
if (string.IsNullOrEmpty(propertyName))
{
throw new ArgumentNullException("ViewModelPropertyName");
}
string idName = IdName(propertyName);
int? resourceId;
if (androidView != null)
{
string viewIdName = AndroidHelpers.FindResourceName(androidView.Id);
if (viewIdName != idName)
{
throw new ArgumentException(string.Format("View Id '{0}' does not match expected value '{1}'; adjust either the view Id or the ViewModelPropertyName binding parameter.", viewIdName, idName));
}
resourceId = androidView.Id;
}
else
{
resourceId = AndroidHelpers.FindResourceId(idName);
}
if (view == null && resourceId.HasValue)
{
view = androidView = rootView.FindViewById(resourceId.Value);
}
if (view == null)
{
return(null);
}
if (androidView != null && androidView.Tag != null)
{
bp = ParseBindingParameters(androidView.Tag.ToString(), bp);
}
string viewMemberName = bp.ViewMemberName;
if ((bp.Mode == BindingMode.OneWay || bp.Mode == BindingMode.TwoWay) && bp.UpdateView == null && viewMemberName == null)
{
ViewDefaultPropertyOrFieldName.TryGetValue(view.GetType().FullName, out viewMemberName);
}
var viewModelPropertyInfo = (string.IsNullOrEmpty(propertyName) || propertyName == ".") ? null : viewModel.GetType().GetProperty(propertyName);
AdapterView commandParameterSelectedItemAdapterView = bp.CommandParameterSelectedItemAdapterView;
if (commandParameterSelectedItemAdapterView == null && bp.ListId.HasValue)
{
commandParameterSelectedItemAdapterView = rootView.FindViewById <AdapterView>(bp.ListId.Value);
}
var binding = new DataBinding
{
ViewProperty = new PropertyReference(view, viewMemberName, viewModelPropertyInfo != null ? viewModelPropertyInfo.PropertyType : null),
ResourceId = resourceId,
UpdateViewAction = bp.UpdateView,
UpdateViewModelAction = bp.UpdateViewModel,
Mode = bp.Mode,
ViewModelPropertyInfo = viewModelPropertyInfo,
CommandParameterListId = bp.ListId,
CommandParameterListView = commandParameterSelectedItemAdapterView
};
string listPropertyName = bp.ListPropertyName;
if (listPropertyName == null)
{
listPropertyName = propertyName + "List";
}
var pi = viewModel.GetType().GetProperty(listPropertyName);
if (pi == null && binding.ViewModelPropertyInfo.PropertyType.GetInterface("IList") != null)
{
listPropertyName = propertyName;
pi = binding.ViewModelPropertyInfo;
binding.ViewModelPropertyInfo = null;
}
binding.ViewModelListPropertyInfo = pi;
if (view is AdapterView)
{
pi = view.GetType().GetProperty("Adapter", BindingFlags.Public | BindingFlags.Instance);
if (pi != null)
{
var adapter = pi.GetValue(view);
if (adapter == null)
{
string itemTemplateName = bp.ListItemTemplateName ?? listPropertyName + "Item";
string itemValueId = (bp.ListItemIsValue && bp.ListItemValueId == null) ? itemTemplateName : bp.ListItemValueId;
int? itemTemplateResourceId = AndroidHelpers.FindResourceId(itemTemplateName, AndroidHelpers.ResourceCategory.Layout);
int? itemValueResourceId = AndroidHelpers.FindResourceId(itemValueId);
if (itemTemplateResourceId.HasValue)
{
adapter = new DataBindableListAdapter <object>(layoutInflater, itemTemplateResourceId.Value, itemTemplateName + "_", itemValueResourceId, rootViewExtensionPoints);
pi.SetValue(view, adapter);
}
}
binding.ListAdapter = adapter as IDataBindableListAdapter;
}
}
switch (binding.Mode)
{
case BindingMode.TwoWay: AddTwoWayHandler(binding); break;
case BindingMode.Command: AddCommandHandler(binding); break;
}
dataBindings.Add(idName, binding);
return(binding);
}
public static BindingParameters ParseBindingParameters(string tag, BindingParameters bp = null)
{
if (tag != null && tag.Contains("{"))
{
var match = Regex.Match(tag, @"({Binding\s+((?<assignment>[^,{}]+),?)+\s*})?(\s*{List\s+((?<assignment>[^,{}]+),?)+\s*})?(\s*{CommandParameter\s+((?<assignment>[^,{}]+),?)+\s*})?");
if (match.Success)
{
var gc = match.Groups["assignment"];
if (gc != null)
{
var cc = gc.Captures;
if (cc != null)
{
if (bp == null)
{
bp = new BindingParameters();
}
for (int i = 0; i < cc.Count; i++)
{
string[] assignmentElements = cc[i].Value.Split('=');
if (assignmentElements.Length == 1)
{
string value = assignmentElements[0].Trim();
if (value != "")
{
bp.ViewModelPropertyName = value;
}
}
else if (assignmentElements.Length == 2)
{
string name = assignmentElements[0].Trim();
string value = assignmentElements[1].Trim();
if (name.StartsWith("."))
{
bp.ViewMemberName = name.Substring(1);
if (value != "")
{
bp.ViewModelPropertyName = value;
}
}
else
{
switch (name)
{
case "Mode": Enum.TryParse <BindingMode>(value, true, out bp.Mode); break;
case "ItemsSource": bp.ListPropertyName = value; break;
case "ItemIsValue": Boolean.TryParse(value, out bp.ListItemIsValue); break;
case "ItemTemplate": bp.ListItemTemplateName = value; break;
case "ItemValueId": bp.ListItemValueId = value; break;
case "ListId": bp.ListId = AndroidHelpers.FindResourceId(value); break;
default: throw new ArgumentException("Unknown tag binding parameter: " + name);
}
}
}
}
}
}
}
}
return(bp);
}