/// <summary>
/// 根据索引位置插入一个列表项
/// </summary>
/// <param name="index">索引位置</param>
/// <param name="item">要插入的列表项</param>
public void Insert(int index, PlayList item)
{
if (index < 0 || index >= this.count)
{
throw new IndexOutOfRangeException("Index was outside the bounds of the array");
}
if (item == null)
{
throw new ArgumentNullException("Item cannot be null");
}
this.EnsureSpace(1);
for (int i = this.count; i > index; i--)
{
m_arrItem[i] = m_arrItem[i - 1];
}
item.OwnerPlayListBox = this.owner;
m_arrItem[index] = item;
this.count++;
this.owner.Invalidate();
}
/// <summary>
/// 判断一个列表项是否在集合内
/// </summary>
/// <param name="item">要判断的列表项</param>
/// <returns>是否在列表项</returns>
public bool Contains(PlayList item)
{
return(this.IndexOf(item) != -1);
}
/// <summary>
/// 获取列表项所在的索引位置
/// </summary>
/// <param name="item">要获取的列表项</param>
/// <returns>索引位置</returns>
public int IndexOf(PlayList item)
{
return(Array.IndexOf <PlayList>(m_arrItem, item));
}
/// <summary>
/// 绘制列表项
/// </summary>
/// <param name="g">绘图表面</param>
/// <param name="list">要绘制的列表项</param>
/// <param name="rectList">该列表项的区域</param>
/// <param name="sb">画刷</param>
protected virtual void DrawList(Graphics g, PlayList list, Rectangle rectList, SolidBrush sb)
{
if (list.Equals(MouseOnList)) //根据列表项现在的状态绘制相应的背景色
{
sb.Color = this.itemMouseOnColor;
}
else
{
sb.Color = this.itemColor;
}
g.FillRectangle(sb, rectList);
//如果展开的画绘制 展开的三角形
if (list.IsOpen)
{
sb.Color = this.arrowColor;
g.FillPolygon(sb, new Point[] {
new Point(2, rectList.Top + 11),
new Point(12, rectList.Top + 11),
new Point(7, rectList.Top + 16)
});
}
else
{
sb.Color = this.arrowColor;
g.FillPolygon(sb, new Point[] {
new Point(5, rectList.Top + 8),
new Point(5, rectList.Top + 18),
new Point(10, rectList.Top + 13)
});
//如果没有展开则在列表项下部画分隔线
g.DrawLine(new Pen(Color.LightGray, 1), 0, rectList.Bottom, rectList.Right, rectList.Bottom);
}
StringFormat sf = new StringFormat();
sf.LineAlignment = StringAlignment.Center;
sf.SetTabStops(0.0F, new float[] { 20.0F });
string strItem = "\t" + list.Text;
sf.Alignment = StringAlignment.Near;
Font listTitleFont = new Font("宋体", 10, FontStyle.Bold);
g.DrawString(strItem, listTitleFont, Brushes.Black, rectList, sf);
float length = g.MeasureString(strItem, listTitleFont).Width;
sf.SetTabStops(0.0f, new float[] { length - 20 });
g.DrawString("\t[" + list.SubItems.Count + "]", new Font("宋体", 9), Brushes.Gray, rectList, sf);
//绘制菜单按钮
if (VScroll.ShouldBeDraw)
{
list.MenuBounds = new Rectangle(rectList.Right - 25 - list.Menu.Width, rectList.Top + 5, list.Menu.Width, list.Menu.Height);
g.DrawImage(list.Menu, list.MenuBounds);
}
else
{
list.MenuBounds = new Rectangle(rectList.Right - 25 - list.Menu.Width, rectList.Top + 5, list.Menu.Width, list.Menu.Height);
g.DrawImage(list.Menu, list.MenuBounds);
}
}
protected override void OnMouseMove(MouseEventArgs e)
{
MousePos = e.Location;
if (VScroll.IsMouseDown)
{
//如果滚动条的滑块处于被点击 那么移动
VScroll.MoveSliderFromLocation(e.Y);
return;
}
if (VScroll.ShouldBeDraw)
{
//如果控件上有滚动条 判断鼠标是否在滚动条区域移动
if (VScroll.Bounds.Contains(MousePos))
{
ClearItemMouseOn();
ClearSubItemMouseOn();
if (VScroll.SliderBounds.Contains(MousePos))
{
VScroll.IsMouseOnSlider = true;
}
else
{
VScroll.IsMouseOnSlider = false;
}
if (VScroll.UpBounds.Contains(MousePos))
{
VScroll.IsMouseOnUp = true;
}
else
{
VScroll.IsMouseOnUp = false;
}
if (VScroll.DownBounds.Contains(MousePos))
{
VScroll.IsMouseOnDown = true;
}
else
{
VScroll.IsMouseOnDown = false;
}
return;
}
else
{
VScroll.ClearAllMouseOn();
}
}
MousePos.Y += VScroll.Value;
//如果不在滚动条范围类 那么根据滚动条当前值计算虚拟的一个坐标
for (int i = 0, Len = items.Count; i < Len; i++)
{
//然后判断鼠标是否移动到某一列表项或者子项
if (items[i].Bounds.Contains(MousePos))
{
if (items[i].IsOpen)
{
//如果展开 判断鼠标是否在某一子项上面
for (int j = 0, lenSubItem = items[i].SubItems.Count; j < lenSubItem; j++)
{
if (items[i].SubItems[j].Bounds.Contains(MousePos))
{
if (MouseOnSongItem != null)
{
//如果当前鼠标下子项不为空
if (items[i].SubItems[j].HeadRect.Contains(MousePos))
{
//判断鼠标是否在头像内
if (!OnMouseEnterHeaded)
{
//如果没有触发进入事件 那么触发用户绑定的事件
OnMouseEnterHead(new ChatListEventArgs(this.MouseOnSongItem, this.selectSubItem));
OnMouseEnterHeaded = true;
}
}
else
{
if (OnMouseEnterHeaded)
{
//如果已经执行过进入事件 那触发用户绑定的离开事件
OnMouseLeaveHead(new ChatListEventArgs(this.MouseOnSongItem, this.selectSubItem));
OnMouseEnterHeaded = false;
}
}
}
if (items[i].SubItems[j].Equals(MouseOnSongItem))
{
return;
}
ClearSubItemMouseOn();
ClearItemMouseOn();
MouseOnSongItem = items[i].SubItems[j];
this.Invalidate(new Rectangle(
MouseOnSongItem.Bounds.X, MouseOnSongItem.Bounds.Y - VScroll.Value,
MouseOnSongItem.Bounds.Width, MouseOnSongItem.Bounds.Height));
//this.Invalidate();
return;
}
}
ClearSubItemMouseOn(); //循环做完没发现子项 那么判断是否在列表上面
if (new Rectangle(0, items[i].Bounds.Top - VScroll.Value, this.Width, 20).Contains(e.Location))
{
if (items[i].Equals(MouseOnList))
{
return;
}
ClearItemMouseOn();
MouseOnList = items[i];
this.Invalidate(new Rectangle(
MouseOnList.Bounds.X, MouseOnList.Bounds.Y - VScroll.Value,
MouseOnList.Bounds.Width, MouseOnList.Bounds.Height));
//this.Invalidate();
return;
}
}
else
{ //如果列表项没有展开 重绘列表项
if (items[i].Equals(MouseOnList))
{
return;
}
ClearItemMouseOn();
ClearSubItemMouseOn();
MouseOnList = items[i];
this.Invalidate(new Rectangle(
MouseOnList.Bounds.X, MouseOnList.Bounds.Y - VScroll.Value,
MouseOnList.Bounds.Width, MouseOnList.Bounds.Height));
//this.Invalidate();
return;
}
}
}//若循环结束 既不在列表上也不再子项上 清空上面的颜色
ClearItemMouseOn();
ClearSubItemMouseOn();
base.OnMouseMove(e);
}
public ChatListSubItemCollection(PlayList owner)
{
this.owner = owner;
}
