protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
//滚动条区域重绘
if (this._scrollBarHandleDrag)
{
//鼠标按下时拖动，更新滑块偏移
this.Offset -= (int)(1.0 * (e.Y - this._scrollBarHandleDragMouseOffsetY) * this._totleItemHeight / this.ClientSize.Height);
this._scrollBarHandleDragMouseOffsetY = e.Y;
}
else
{
//更新滑块的画刷
bool focusHandle = this._scrollBarHandleBounds.Contains(e.Location);
if (focusHandle &&
this._scrollBarHandleBrush != SCROLLBAR_HANDLE_BRUSH_FOCUSED)
{
//鼠标移动到上面时候绘制Foused的深色
this._scrollBarHandleBrush = SCROLLBAR_HANDLE_BRUSH_FOCUSED;
}
else if (!focusHandle &&
this._scrollBarHandleBrush != SCROLLBAR_HANDLE_BRUSH_NORMAL)
{
this._scrollBarHandleBrush = SCROLLBAR_HANDLE_BRUSH_NORMAL;
}
}
ScrollableListItem item = HitTest(e.Location);
if (item != null)
{
//触发Hover事件
ItemHoverEventArgs args = new ItemHoverEventArgs(item, e.Location);
OnItemHover(args);
}
this.Invalidate();
}
protected virtual void OnItemHover(ItemHoverEventArgs args)
{
this.ItemHover?.Invoke(this, args);
}