/// <summary>
/// 单选模式下的写值操作
/// </summary>
/// <param name="curEntity">正在编辑的实体。</param>
/// <param name="svm">选择视图模型</param>
/// <param name="selectedEntities">当前被选择的实体</param>
private SetSelectionResult SyncSelectionToValue_Single(Entity curEntity, SelectionViewMeta svm, IList<Entity> selectedEntities)
{
bool success = false;
//引用属性，应该先尝试设置实体属性，再设置 Id 属性。
var rp = this.Meta.PropertyMeta.ManagedProperty as IRefProperty;
if (selectedEntities.Count > 0)
{
var selectedEntity = selectedEntities[0] as Entity;
if (rp != null)
{
//如果 SelectedValuePath 是一个引用属性，或者直接就是一个实体属性，
//则应该获取相应的实体的值。
var valuePath = svm.SelectedValuePath;
if (valuePath != null)
{
if (valuePath is IRefProperty)
{
selectedEntity = selectedEntity.GetRefEntity((valuePath as IRefProperty).RefEntityProperty);
}
else if (rp.RefEntityType.IsAssignableFrom(valuePath.PropertyType))
{
selectedEntity = this.GetSelectedValue(selectedEntity) as Entity;
}
}
//设置实体到本引用属性上。
this.OnReferenceEntityChanging();
curEntity.SetRefEntity(rp.RefEntityProperty, selectedEntity, ManagedPropertyChangedSource.FromUIOperating);
success = curEntity.GetRefEntity(rp.RefEntityProperty) == selectedEntity;
if (success) { this.OnReferenceEntityChanged(); }
}
else
{
var value = this.GetSelectedValue(selectedEntity);
this.PropertyValue = value;
success = this.PropertyValue == value;
if (success && svm.RefIdHost != null)
{
curEntity.SetProperty(svm.RefIdHost, selectedEntity.Id, ManagedPropertyChangedSource.FromUIOperating);
}
}
}
else
{
if (rp != null)
{
this.OnReferenceEntityChanging();
curEntity.SetRefEntity(rp.RefEntityProperty, null, ManagedPropertyChangedSource.FromUIOperating);
success = curEntity.GetRefEntity(rp.RefEntityProperty) == null;
if (success) { this.OnReferenceEntityChanged(); }
}
else
{
this.PropertyValue = null;
success = this.PropertyValue == null;
if (success && svm.RefIdHost != null)
{
curEntity.SetProperty(svm.RefIdHost, null, ManagedPropertyChangedSource.FromUIOperating);
}
}
}
return success ? SetSelectionResult.Success : SetSelectionResult.Cancel;
}
/// <summary>
/// 多选模式下的写值操作
/// </summary>
/// <param name="curEntity">正在编辑的实体。</param>
/// <param name="svm">选择视图模型</param>
/// <param name="selectedEntities">当前被选择的实体</param>
private SetSelectionResult SyncSelectionToValue_Multiple(Entity curEntity, SelectionViewMeta rvm, IList<Entity> selectedEntities)
{
var result = string.Join(rvm.SplitterIfMulti, selectedEntities.Select(i => this.GetSelectedValue(i)));
//赋值给this.PropertyValue
this.PropertyValue = result;
SetSelectionResult res = (this.PropertyValue as string) == result ? SetSelectionResult.Success : SetSelectionResult.Cancel;
if (res == SetSelectionResult.Success)
{
//此时这个属性应该是一个 int 数组类型
if (rvm.RefIdHost != null)
{
var idArray = selectedEntities.Select(i => i.Id).ToArray();
curEntity.SetProperty(rvm.RefIdHost, idArray, ManagedPropertyChangedSource.FromUIOperating);
}
}
return res;
}
