public FilterScheme(Type targetType, string title, ConditionTreeItem root)
{
Argument.IsNotNull(() => targetType);
Argument.IsNotNull(() => title);
Argument.IsNotNull(() => root);
TargetType = targetType;
Title = title;
ConditionItems = new ObservableCollection <ConditionTreeItem>();
ConditionItems.Add(root);
}
public FilterScheme(Type targetType, string title, ConditionTreeItem root)
{
Argument.IsNotNull(() => targetType);
Argument.IsNotNull(() => title);
Argument.IsNotNull(() => root);
SuspendValidation = true;
TargetType = targetType;
Title = title;
ConditionItems = new ObservableCollection<ConditionTreeItem>();
ConditionItems.Add(root);
}
public static Expression <Func <T, bool> > BuildLambda <T>(this ConditionTreeItem conditionTreeItem)
{
var type = typeof(T);
var parameterExpression = Expression.Parameter(type, "item");
var expression = conditionTreeItem.BuildExpression(parameterExpression);
if (expression is null)
{
return(null);
}
return(Expression.Lambda <Func <T, bool> >(expression, parameterExpression));
}
private static Expression BuildExpression(this ConditionTreeItem conditionTreeItem,
ParameterExpression parameterExpression)
{
switch (conditionTreeItem)
{
case ConditionGroup conditionGroup:
return(conditionGroup.BuildExpression(parameterExpression));
case PropertyExpression propertyExpression:
return(propertyExpression.BuildExpression(parameterExpression));
default:
return(null);
}
}
private bool OnDeleteConditionCanExecute(ConditionTreeItem item)
{
if (item is null)
{
return(false);
}
if (!item.IsRoot())
{
return(true);
}
if (FilterScheme.ConditionItems.Count > 1)
{
return(true);
}
return(false);
}
private int CountInvalidItems(ConditionTreeItem conditionTreeItem)
{
var items = conditionTreeItem == null ? null : conditionTreeItem.Items;
if (items == null || items.Count == 0)
{
return(conditionTreeItem == null ? 0 : conditionTreeItem.IsValid ? 0 : 1);
}
int invalidCount = 0;
foreach (var item in items)
{
invalidCount += CountInvalidItems(item);
}
invalidCount += conditionTreeItem == null ? 0 : conditionTreeItem.IsValid ? 0 : 1;
return(invalidCount);
}
private void OnDeleteCondition(ConditionTreeItem item)
{
if (item.Parent is null)
{
FilterScheme.ConditionItems.Remove(item);
foreach (var conditionItem in FilterScheme.ConditionItems)
{
conditionItem.Items.Remove(item);
}
}
else
{
item.Parent.Items.Remove(item);
}
_isFilterDirty = true;
UpdatePreviewItems();
}
private int CountInvalidItems(ConditionTreeItem conditionTreeItem)
{
var items = conditionTreeItem == null ? null : conditionTreeItem.Items;
if (items == null || items.Count == 0)
{
return conditionTreeItem == null ? 0 : conditionTreeItem.IsValid ? 0 : 1;
}
int invalidCount = 0;
foreach (var item in items)
{
invalidCount += CountInvalidItems(item);
}
invalidCount += conditionTreeItem == null ? 0 : conditionTreeItem.IsValid ? 0 : 1;
return invalidCount;
}
private void OnDeleteCondition(ConditionTreeItem item)
{
if (item.Parent == null)
{
FilterScheme.ConditionItems.Remove(item);
foreach (var conditionItem in FilterScheme.ConditionItems)
{
conditionItem.Items.Remove(item);
}
}
else
{
item.Parent.Items.Remove(item);
}
_isFilterDirty = true;
UpdatePreviewItems();
}
private bool OnDeleteConditionCanExecute(ConditionTreeItem item)
{
if (item == null)
{
return false;
}
if (!item.IsRoot())
{
return true;
}
if (FilterScheme.ConditionItems.Count > 1)
{
return true;
}
return false;
}
private void OnDeleteCondition(ConditionTreeItem item)
{
if (item.Parent == null)
{
item.Items.Clear();
}
else
{
item.Parent.Items.Remove(item);
}
}
