/// <summary>
/// Initializes the singleton resource, assuming the Ultraviolet context is currently in a valid state.
/// </summary>
/// <returns><see langword="true"/> if the instance was successfully initialized; otherwise, <see langword="false"/>.</returns>
public Boolean InitializeResource()
{
if (initialized)
{
return(true);
}
var uv = UltravioletContext.RequestCurrent();
if (uv == null || uv.Disposing || uv.Disposed)
{
return(false);
}
if (resource == null || resource.Ultraviolet != uv)
{
if (ShouldInitializeResource(uv))
{
resource = initializer(uv);
}
}
initialized = true;
return(true);
}
/// <inheritdoc/>
protected override void OnRestart()
{
var uv = UltravioletContext.RequestCurrent();
if (uv != null && !uv.Disposed)
{
var data = uv.Messages.CreateMessageData <AndroidLifecycleMessageData>();
data.Activity = this;
uv.Messages.Publish(UltravioletMessages.AndroidActivityRestart, data);
}
base.OnRestart();
}
/// <inheritdoc/>
protected override void OnDestroy()
{
var uv = UltravioletContext.RequestCurrent();
if (uv != null && !uv.Disposed)
{
/*TODO
* var data = uv.Messages.CreateMessageData<AndroidLifecycleMessageData>();
* data.Activity = this;
* uv.Messages.Publish(UltravioletMessages.AndroidActivityDestroy, data);
*/
}
base.OnDestroy();
}
/// <summary>
/// Initializes the singleton resource, assuming the Ultraviolet context is currently in a valid state.
/// </summary>
public void InitializeResource()
{
var uv = UltravioletContext.RequestCurrent();
if (uv == null || uv.Disposing || uv.Disposed)
{
return;
}
if (resource == null || resource.Ultraviolet != uv)
{
if (ShouldInitializeResource(uv))
{
resource = initializer(uv);
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="UltravioletSingleton{T}"/> class.
/// </summary>
/// <param name="flags">A set of flags which modify the singleton's behavior.</param>
/// <param name="initializer">A function which initializes a new instance of the bound resource.</param>
public UltravioletSingleton(UltravioletSingletonFlags flags, Func <UltravioletContext, T> initializer)
{
Contract.Require(initializer, nameof(initializer));
this.Flags = flags;
this.initializer = initializer;
var uv = UltravioletContext.RequestCurrent();
if (uv != null && uv.IsInitialized)
{
InitializeResource();
}
UltravioletContext.ContextInitialized += UltravioletContext_ContextInitialized;
UltravioletContext.ContextInvalidated += UltravioletContext_ContextInvalidated;
}
