/// <summary>
/// Binds to a control's <see cref="Control.DataContext"/> using the specified <paramref name="dataContextBinding"/>.
/// </summary>
/// <remarks>
/// This creates a <see cref="DualBinding{TValue}"/> between a binding to the specified <paramref name="dataContextBinding"/> and this binding.
/// Since the data context changes, the binding passed for the data context binding is an indirect binding, in that it is reused.
/// The binding is added to the <see cref="Control.Bindings"/> collection.
/// </remarks>
/// <returns>A new dual binding that binds the <paramref name="dataContextBinding"/> to this control binding.</returns>
/// <param name="dataContextBinding">Binding to get/set values from/to the control's data context.</param>
/// <param name="mode">Dual binding mode.</param>
/// <param name="defaultControlValue">Default control value.</param>
/// <param name="defaultContextValue">Default context value.</param>
public DualBinding <TValue> BindDataContext(IndirectBinding <TValue> dataContextBinding, DualBindingMode mode = DualBindingMode.TwoWay, TValue defaultControlValue = default(TValue), TValue defaultContextValue = default(TValue))
{
var control = DataItem;
if (control == null)
{
throw new InvalidOperationException("Binding must be attached to a control");
}
var contextBinding = new ControlBinding <Control, object>(control, new DelegateBinding <Control, object>(w => w.DataContext, null, (w, h) => w.DataContextChanged += h, (w, h) => w.DataContextChanged -= h));
var valueBinding = new ObjectBinding <object, TValue>(control.DataContext, dataContextBinding)
{
GettingNullValue = defaultControlValue,
SettingNullValue = defaultContextValue,
DataItem = contextBinding.DataValue
};
DualBinding <TValue> binding = Bind(sourceBinding: valueBinding, mode: mode);
contextBinding.DataValueChanged += delegate
{
((ObjectBinding <object, TValue>)binding.Source).DataItem = contextBinding.DataValue;
};
control.Bindings.Add(contextBinding);
return(binding);
}
/// <summary>
/// Adds a new binding to the control with a direct value binding
/// </summary>
/// <param name="controlBinding">Binding to get/set the value from the control.</param>
/// <param name="valueBinding">Value binding to get/set the value from another source.</param>
/// <param name="mode">Mode of the binding</param>
public DualBinding <T> Bind <T>(IndirectBinding <T> controlBinding, DirectBinding <T> valueBinding, DualBindingMode mode = DualBindingMode.TwoWay)
{
var binding = new ControlBinding <Control, T>(this, controlBinding);
return(binding.Bind(sourceBinding: valueBinding, mode: mode));
}
/// <summary>
/// Adds a new binding from the control to its data context
/// </summary>
/// <param name="controlBinding">Binding to get/set the value from the control.</param>
/// <param name="dataContextBinding">Binding to get/set the value from the <see cref="Control.DataContext"/>.</param>
/// <param name="mode">Mode of the binding.</param>
/// <param name="defaultControlValue">Default control value to set to the objectValue, if the value of the control property is null.</param>
/// <param name="defaultContextValue">Default context value to set to the control, if the objectValue or value of the objectBinding is null.</param>
public DualBinding <T> BindDataContext <T>(IndirectBinding <T> controlBinding, IndirectBinding <T> dataContextBinding, DualBindingMode mode = DualBindingMode.TwoWay, T defaultControlValue = default(T), T defaultContextValue = default(T))
{
var binding = new ControlBinding <Control, T>(this, controlBinding);
return(binding.BindDataContext(dataContextBinding, mode, defaultControlValue, defaultContextValue));
}
