void PowerListBoxItem_Loaded(object sender, RoutedEventArgs e)
{
if (DesignerProperties.GetIsInDesignMode(this))
{
return;
}
//初始化列表项的多选状态
CanCheck = ListBox.IsMultipleSelectEnable && ListBox.IsMultipleSelect;
//初始化该列表项的可视状态
if (ListBox.EnableScrollAnimation)
{
var index = GetIndexInListBox();
if (index < ListBox.FirstVisibleIndex || index > ListBox.LastVisibleIndex)
{
VisualField = VisualFieldState.Out;
}
else
{
VisualField = VisualFieldState.UpIn;
}
}
//初始化列表项的漂浮状态
_floatingElements.Clear();
var eles = this.Descendants <FrameworkElement>().Where(GetIsFloatingElement);
eles.ForEachEx(t =>
{
_floatingElements.Add(t);
t.Tag = GetDefaultFloatingEffect(t);
});
_floatingElements.ForEach(t => Floating(IsSelected));
}
/// <summary>
/// 不会触发状态的改变
/// </summary>
/// <param name="value"></param>
internal void SetVisualFieldInternal(VisualFieldState value)
{
if (ListBox.EnableScrollAnimation)
{
Opacity = value != VisualFieldState.Out ? 1 : 0;
}
else
{
Opacity = 1;
}
_visualField = value;
Floating(_visualField != VisualFieldState.Out && IsSelected && CanCheck);
}
/// <summary>
/// 跳转到指定的状态
/// </summary>
/// <param name="visualField"></param>
internal void GoToVisualFieldState(VisualFieldState visualField)
{
Opacity = 1;
if (!ListBox.EnableScrollAnimation || DesignerProperties.GetIsInDesignMode(this))
{
return;
}
if (_visualField == VisualFieldState.Out)
{
//不在可视区域的列表项Opacity设为0，这样当它进入可视区域时，动画效果会更好
Opacity = 0;
VisualStateManager.GoToState(this, "OutVisualField", true);
}
else if (_visualField == VisualFieldState.UpIn)
{
VisualStateManager.GoToState(this, "UpInVisualField", true);
}
else
{
VisualStateManager.GoToState(this, "DownInVisualField", true);
}
}
/// <summary>
/// 不会触发状态的改变
/// </summary>
/// <param name="value"></param>
internal void SetVisualFieldInternal(VisualFieldState value)
{
if (ListBox.EnableScrollAnimation)
Opacity = value != VisualFieldState.Out ? 1 : 0;
else
Opacity = 1;
_visualField = value;
Floating(_visualField != VisualFieldState.Out && IsSelected && CanCheck);
}
/// <summary>
/// 跳转到指定的状态
/// </summary>
/// <param name="visualField"></param>
internal void GoToVisualFieldState(VisualFieldState visualField)
{
Opacity = 1;
if (!ListBox.EnableScrollAnimation || DesignerProperties.GetIsInDesignMode(this))
return;
if (_visualField == VisualFieldState.Out)
{
//不在可视区域的列表项Opacity设为0，这样当它进入可视区域时，动画效果会更好
Opacity = 0;
VisualStateManager.GoToState(this, "OutVisualField", true);
}
else if (_visualField == VisualFieldState.UpIn)
{
VisualStateManager.GoToState(this, "UpInVisualField", true);
}
else
{
VisualStateManager.GoToState(this, "DownInVisualField", true);
}
}
