/// <summary>
/// 添加。
/// 如BindingSource不为空，则设置数据源
/// </summary>
/// <param name="item"></param>
public override void Add(IBindingControl item)
{
if (m_bindingSource != null)
{
item.SetDataBinding(m_bindingSource, "");
}
base.Add(item);
}
/// <summary>
/// ��ӡ�
/// ��BindingSource��Ϊ�գ�����������Դ
/// </summary>
/// <param name="item"></param>
public override void Add(IBindingControl item)
{
if (m_bindingSource != null)
{
item.SetDataBinding(m_bindingSource, "");
}
base.Add(item);
}
public static void Refresh <TSourceValue, TTargetValue>(
BindingMode bindingMode,
IBindingControl <TSourceValue, TTargetValue> bindingControl)
{
switch (bindingMode)
{
#if WPF
case BindingMode.OneWayToSource:
break;
#endif
default:
bindingControl.UpdateTargetValue();
break;
}
}
private bool TryPeek(out IBindingControl bindingControl)
{
#if WINDOWS_UWP
return(this.bindingControlQueue.TryPeek(out bindingControl));
#else
if (this.bindingControlQueue.Count > 0)
{
bindingControl = this.bindingControlQueue.Peek();
return(true);
}
bindingControl = null;
return(false);
#endif
}
/// <summary>
/// Enqueues the specified binding control.
/// </summary>
/// <param name="bindingControl">The binding control.</param>
/// <returns>A dequeuer.</returns>
public bool TryEnqueue(IBindingControl bindingControl)
{
/*if (this.bindingControlSet.Contains(bindingControl))
* {
* return false;
* }
*
* this.bindingControlSet.Add(bindingControl);*/
if (this.bindingControlQueue.Contains(bindingControl))
{
return(false);
}
this.bindingControlQueue.Enqueue(bindingControl);
return(true);
}
/// <summary>
/// 在列表末尾添加新的实体类。
/// 如当前状态为StateType.Add或StateType.Edit，则直接返回，不添加新记录
/// 状态设置为<see cref="StateType.Add"/>，
/// 当前位置设置为新添加的实体类位置，
/// 焦点转移到第一个可添加数据的的数据控件
/// </summary>
protected override object DoAddNew()
{
if (State == StateType.Add || State == StateType.Edit)
{
return(null);
}
// before load, m_item is null
if (this.DisplayManager.Items == null)
{
IList newList = NewList();
// not to set BindingControls
if (this.DisplayManager.BindingControls.Count > 0)
{
IBindingControl[] bcs = new IBindingControl[this.DisplayManager.BindingControls.Count];
this.DisplayManager.BindingControls.CopyTo(bcs, 0);
this.DisplayManager.BindingControls.Clear();
this.DisplayManager.SetDataBinding(newList, string.Empty);
this.DisplayManager.BindingControls.AddRange(bcs);
}
else
{
this.DisplayManager.SetDataBinding(newList, string.Empty);
}
}
object entity = AddNewItem();
m_beforeAddPos = this.DisplayManager.Position;
this.DisplayManager.Position = this.DisplayManager.Items.Count - 1;
State = StateType.Add;
return(entity);
//this.DisplayManager.DataControls.FocusFirstInsertableControl();
}
/// <summary>Updates the specified data binding state.</summary>
/// <param name="bindingControl">The binding control.</param>
public void Update(IBindingControl bindingControl)
{
if (this.bindingDispatcher.HasAccess)
{
bindingControl.UpdateTargetValue();
return;
}
if (bindingControl.IsUpdatePending)
{
return;
}
bindingControl.IsUpdatePending = true;
var shouldDispatch = this.updateQueue.IsEmpty;
this.updateQueue.Enqueue(bindingControl);
if (shouldDispatch)
{
this.bindingDispatcher.InvokeAsync(this.PerformUpdate);
}
}
public void Initialize(IBindingControl bindingControl)
{
this.bindingControl = bindingControl;
}
public static void UpdateTargetValue <TRoot, TSource, TSourceValue, TTarget, TTargetValue>(
IBindingControl <TSourceValue, TTargetValue> bindingControl,
IDataBindingState <TRoot, TSource, TSourceValue, TTarget, TTargetValue> dataBindingState)
where TTarget : DependencyObject
{
if (dataBindingState.IsUpdating)
{
return;
}
TTargetValue targetValue = default;
var setValue = false;
try
{
var target = dataBindingState.Target;
if (target != null)
{
setValue = true;
if (dataBindingState.TryGetSourceValue(out var sourceValue))
{
targetValue = dataBindingState.ConversionParameters.ValueConverter != null?dataBindingState.ConversionParameters.ValueConverter.Convert(
sourceValue,
typeof(TTargetValue),
dataBindingState.ConversionParameters.ConverterParameter,
#if WINDOWS_UWP
(string)target.GetValue(FrameworkElement.LanguageProperty))
#else
((XmlLanguage)target.GetValue(FrameworkElement.LanguageProperty)).GetSpecificCulture())
#endif
: bindingControl.Convert(sourceValue);
}
else
{
targetValue = dataBindingState.ConversionParameters.TargetNullValue.Value;
}
}
}
catch (Exception)
{
setValue = true;
targetValue = dataBindingState.ConversionParameters.FallbackValue.Value;
}
finally
{
/*if (!Equals(targetValue, dataBindingState.CurrentTargetValue))
* {*/
if (setValue)
{
dataBindingState.IsUpdating = true;
//// dataBindingState.CurrentTargetValue = targetValue;
#if WINDOWS_UWP
dataBindingState.Target.SetValue(dataBindingState.TargetProperty, targetValue);
#else
dataBindingState.Target.SetCurrentValue(dataBindingState.TargetProperty, targetValue);
#endif
dataBindingState.IsUpdating = false;
//// }
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="Dequeuer" /> struct.
/// </summary>
/// <param name="updateQueue">The update queue.</param>
/// <param name="bindingControl">The binding control.</param>
public Dequeuer(UpdateQueue updateQueue, IBindingControl bindingControl)
{
this.updateQueue = updateQueue;
this.Value = bindingControl;
}
internal void Remove(IBindingControl bindingControl)
{
this.bindingControlQueue.Dequeue();
//// this.bindingControlSet.Remove(bindingControl);
}
/// <summary>
/// ���б�ĩβ����µ�ʵ���ࡣ
/// �統ǰ״̬ΪStateType.Add��StateType.Edit����ֱ�ӷ��أ�������¼�¼
/// ״̬����Ϊ<see cref="StateType.Add"/>��
/// ��ǰλ������Ϊ����ӵ�ʵ����λ�ã�
/// ����ת�Ƶ���һ����������ݵĵ����ݿؼ�
/// </summary>
protected override object DoAddNew()
{
if (State == StateType.Add || State == StateType.Edit)
{
return null;
}
// before load, m_item is null
if (this.DisplayManager.Items == null)
{
IList newList = NewList();
// not to set BindingControls
if (this.DisplayManager.BindingControls.Count > 0)
{
IBindingControl[] bcs = new IBindingControl[this.DisplayManager.BindingControls.Count];
this.DisplayManager.BindingControls.CopyTo(bcs, 0);
this.DisplayManager.BindingControls.Clear();
this.DisplayManager.SetDataBinding(newList, string.Empty);
this.DisplayManager.BindingControls.AddRange(bcs);
}
else
{
this.DisplayManager.SetDataBinding(newList, string.Empty);
}
}
object entity = AddNewItem();
m_beforeAddPos = this.DisplayManager.Position;
this.DisplayManager.Position = this.DisplayManager.Items.Count - 1;
State = StateType.Add;
return entity;
//this.DisplayManager.DataControls.FocusFirstInsertableControl();
}
