/// <inheritdoc/>
protected override void BuildRenderInput(RenderTreeBuilder builder)
{
RefreshState();
if (itemsToRender.Count > 0)
{
UglyHack uglyHack = new UglyHack(); // see comment below
foreach (var item in itemsToRender)
{
TValue value = SelectorHelpers.GetValue <TItem, TValue>(ValueSelector, item);
builder.OpenComponent(1, typeof(HxInputCheckbox));
builder.AddAttribute(2, nameof(HxInputCheckbox.Label), SelectorHelpers.GetText(TextSelector, item));
builder.AddAttribute(3, nameof(HxInputCheckbox.Value), Value?.Contains(value) ?? false);
builder.AddAttribute(4, nameof(HxInputCheckbox.ValueChanged), EventCallback.Factory.Create <bool>(this, @checked => HandleValueChanged(@checked, item)));
builder.AddAttribute(5, nameof(HxInputCheckbox.Enabled), EnabledEffective);
// We need ValueExpression. Ehm, HxInputCheckbox needs ValueExpression. Because it is InputBase<T> which needs ValueExpression.
// We have nothing to give the HxInputCheckbox. So we make own class with property which we assign to the ValueExpression.
// Impacts? Unknown. Maybe none.
builder.AddAttribute(6, nameof(HxInputCheckbox.ValueExpression), (Expression <Func <bool> >)(() => uglyHack.HackProperty));
builder.AddAttribute(7, nameof(HxInputCheckbox.ShowValidationMessage), false);
builder.AddAttribute(8, nameof(HxInputCheckbox.Inline), this.Inline);
builder.AddMultipleAttributes(100, this.AdditionalAttributes);
builder.CloseComponent();
}
}
}
protected override void RenderChipValue(RenderTreeBuilder builder)
{
if ((chipValue is null) && (Value != null) && (DataImpl != null))
{
// fallback for initial rendering without chipValue
// does not help when DataImpl is not set yet (loaded asynchronously)
var item = DataImpl.FirstOrDefault(item => comparer.Equals(Value, SelectorHelpers.GetValue <TItem, TValue>(ValueSelectorImpl, item)));
chipValue = SelectorHelpers.GetText(TextSelectorImpl, item);
}
builder.AddContent(0, chipValue);
}
/// <inheritdoc/>
protected override bool TryParseValueFromString(string value, out TValue result, out string validationErrorMessage)
{
int index = int.Parse(value);
result = (index == -1)
? default(TValue)
: SelectorHelpers.GetValue <TItem, TValue>(ValueSelectorImpl, itemsToRender[index]);
validationErrorMessage = null;
return(true);
}
/// <inheritdoc />
protected override string FormatValueAsString(List <TValue> value)
{
// Used for CurrentValueAsString (which is used for the input element and for the chip generator).
// Thats why we do not use NullDataText here.
if ((!value?.Any() ?? true) || (Data == null))
{
// don't care about chip generator, it does not call this method for null/empty value
return(EmptyText);
}
// Take itemsToRender because they are sorted.
List <TItem> selectedItems = itemsToRender.Where(item => value.Contains(SelectorHelpers.GetValue <TItem, TValue>(ValueSelector, item))).ToList();
return(String.Join(", ", selectedItems.Select(TextSelector)));
}
private void HandleItemSelectionChanged(bool @checked, TItem item)
{
var newValue = Value == null ? new List <TValue>() : new List <TValue>(Value);
TValue value = SelectorHelpers.GetValue <TItem, TValue>(ValueSelector, item);
if (@checked)
{
newValue.Add(value);
}
else
{
newValue.Remove(value);
}
CurrentValue = newValue; // setter includes ValueChanged + NotifyFieldChanged
}
public void SelectorHelpers_GetValue()
{
Assert.AreEqual(null, SelectorHelpers.GetValue <int?, string>(i => "X" + i, null)); // use default
Assert.AreEqual("X1", SelectorHelpers.GetValue <int?, string>(i => "X" + i, 1)); // use value selector
Assert.AreEqual(1, SelectorHelpers.GetValue <int?, int?>(null, 1)); // use value selector
}
private void RefreshState()
{
if (DataImpl != null)
{
itemsToRender = DataImpl.ToList();
// AutoSort
if (AutoSortImpl && (itemsToRender.Count > 1))
{
if (SortKeySelectorImpl != null)
{
itemsToRender = itemsToRender.OrderBy(this.SortKeySelectorImpl).ToList();
}
else if (TextSelectorImpl != null)
{
itemsToRender = itemsToRender.OrderBy(this.TextSelectorImpl).ToList();
}
else
{
itemsToRender = itemsToRender.OrderBy(i => i.ToString()).ToList();
}
}
// set next properties for rendering
selectedItemIndex = itemsToRender.FindIndex(item => comparer.Equals(Value, SelectorHelpers.GetValue <TItem, TValue>(ValueSelectorImpl, item)));
if ((Value != null) && (selectedItemIndex == -1))
{
throw new InvalidOperationException($"Data does not contain item for current value '{Value}'.");
}
}
else
{
itemsToRender = null;
selectedItemIndex = -1;
}
}
private void HandleInputClick(int index)
{
CurrentValue = SelectorHelpers.GetValue <TItem, TValue>(ValueSelectorImpl, itemsToRender[index]);
}
