/// <summary>
/// (Internal) Called whenever an input event is raised when this control is displayed.
/// </summary>
/// <param name="key">The key or gamepad button that raised the event</param>
/// <param name="modifiers">Which modifier keys are down?</param>
/// <param name="gamepadIndex">Index of the gamepad that raised the event, if the key is a gamepad button, or -1 if it was a keyboard key</param>
/// <param name="isRepeat">Is this a "repeated key press" event, automatically generated while the used holds the key down?</param>
internal override void OnInputEvent(KeyCode key, ModifierKeys modifiers, int gamepadIndex, bool isRepeat)
{
if (!Enabled || (MenuItems.Count == 0))
{
return; // Not enabled or no menu items, do nothing
}
if (SelectionUpKeys.Contains(key))
{
//SelectedIndex_--;
//if (SelectedIndex_ < 0) SelectedIndex_ = LoopItemSelection ? MenuItems.Count - 1 : 0;
SelectedIndex_ = GetNextNonSeparatorIndex(SelectedIndex - 1, -1);
if (MenuItems[SelectedIndex_].HasValue)
{
OnSelectedItemChanged?.Invoke(SelectedIndex, MenuItems[SelectedIndex_].Value.Key, MenuItems[SelectedIndex_].Value.Text);
}
Page.UI.Invalidate();
}
else if (SelectionDownKeys.Contains(key))
{
//SelectedIndex_++;
//if (SelectedIndex_ >= MenuItems.Count) SelectedIndex_ = LoopItemSelection? 0 : MenuItems.Count - 1;
SelectedIndex_ = GetNextNonSeparatorIndex(SelectedIndex + 1, 1);
if (MenuItems[SelectedIndex_].HasValue)
{
OnSelectedItemChanged?.Invoke(SelectedIndex, MenuItems[SelectedIndex_].Value.Key, MenuItems[SelectedIndex_].Value.Text);
}
Page.UI.Invalidate();
}
else if (ValidationKeys.Contains(key))
{
ValidateSelection();
}
}
private void UpdateSelectedItem(object value)
{
_selectedItem = value;
CellBase cell = _list.Children.OfType <CellBase>().FirstOrDefault(c => c.Item == value);
MarkCellAsSelected(cell);
OnSelectedItemChanged?.Invoke(this, new SelectedItemEventArgs(_selectedItem));
}
/// <summary>
/// 下拉框选项点击时调用此方法
/// </summary>
protected async Task OnItemClick(SelectedItem item)
{
item.Active = true;
SelectedItem = item;
CurrentValueAsString = item.Value;
// 触发 SelectedItemChanged 事件
if (OnSelectedItemChanged != null)
{
await OnSelectedItemChanged.Invoke(SelectedItem);
}
}
/// <summary>
///
/// </summary>
/// <returns></returns>
private async Task ItemChanged(SelectedItem item)
{
item.Active = true;
SelectedItem = item;
CurrentValueAsString = item.Value;
// 触发 SelectedItemChanged 事件
if (OnSelectedItemChanged != null)
{
await OnSelectedItemChanged.Invoke(SelectedItem);
}
if (AutoClearSearchText)
{
SearchText = string.Empty;
}
}
/// <summary>
/// OnAfterRenderAsync 方法
/// </summary>
/// <param name="firstRender"></param>
/// <returns></returns>
protected override async Task OnAfterRenderAsync(bool firstRender)
{
await base.OnAfterRenderAsync(firstRender);
if (firstRender)
{
if (Interop == null)
{
Interop = new JSInterop <Select <TValue> >(JSRuntime);
}
await Interop.InvokeVoidAsync(this, SelectElement, "bb_select", nameof(ConfirmSelectedItem));
if (SelectedItem != null && OnSelectedItemChanged != null)
{
await OnSelectedItemChanged.Invoke(SelectedItem);
}
}
}
/// <summary>
/// Removes a menu item. CAUTION: Will mess up the menu item indices.
/// </summary>
/// <param name="index">Index of the menu item to remove</param>
public void RemoveMenuItem(int index)
{
if ((index < 0) || (index >= MenuItems.Count))
{
return;
}
MenuItems.RemoveAt(index);
if (SelectedIndex_ >= MenuItems.Count)
{
SelectedIndex_ = MenuItems.Count - 1;
if (MenuItems[SelectedIndex_].HasValue)
{
OnSelectedItemChanged?.Invoke(SelectedIndex, MenuItems[SelectedIndex_].Value.Key, MenuItems[SelectedIndex_].Value.Text);
}
}
Page.UI.Invalidate();
}
/// <summary>
/// 下拉框选项点击时调用此方法
/// </summary>
private async Task OnItemClick(SelectedItem item)
{
if (!item.IsDisabled)
{
var i = Items.FirstOrDefault(i => i.Active);
if (i != null)
{
i.Active = false;
}
item.Active = true;
SelectedItem = item;
CurrentValueAsString = item.Value;
// 触发 SelectedItemChanged 事件
if (OnSelectedItemChanged != null)
{
await OnSelectedItemChanged.Invoke(SelectedItem);
}
}
}
/// <summary>
/// 下拉框选项点击时调用此方法
/// </summary>
protected async Task OnItemClick(SelectedItem item)
{
if (!item.IsDisabled)
{
if (SelectedItem != null)
{
SelectedItem.Active = false;
}
SelectedItem = item;
SelectedItem.Active = true;
// ValueChanged
CurrentValueAsString = SelectedItem.Value;
// 触发 SelectedItemChanged 事件
if (OnSelectedItemChanged != null)
{
await OnSelectedItemChanged.Invoke(SelectedItem);
}
}
}
/// <summary>
/// OnAfterRenderAsync 方法
/// </summary>
/// <param name="firstRender"></param>
/// <returns></returns>
protected override async Task OnAfterRenderAsync(bool firstRender)
{
await base.OnAfterRenderAsync(firstRender);
if (firstRender)
{
if (OnSearchTextChanged == null)
{
OnSearchTextChanged = text => Items.Where(i => i.Text.Contains(text, StringComparison.OrdinalIgnoreCase));
}
if (Interop == null)
{
Interop = new JSInterop <Select <TValue> >(JSRuntime);
}
await Interop.Invoke(this, SelectElement, "bb_select", nameof(ConfirmSelectedItem));
if (Initialized && SelectedItem != null && OnSelectedItemChanged != null)
{
await OnSelectedItemChanged.Invoke(SelectedItem);
}
}
}
/// <summary>
/// 选择的实例有变更
/// <para>触发</para>
/// </summary>
/// <param name="selected_item"></param>
protected virtual void RaiseSelectedItemChanged(T selected_item)
{
DHelper.InvokeOnMain(() => OnSelectedItemChanged?.Invoke(selected_item));
}