private ShengAddressBarDropDown GetButtonDropDown(IShengAddressNode addressNode)
{
ShengAddressBarDropDown dropDown = new ShengAddressBarDropDown();
if (this.DropDownRenderer != null)
{
dropDown.Renderer = this.DropDownRenderer;
}
dropDown.LayoutStyle = ToolStripLayoutStyle.Table;
dropDown.MaximumSize = new Size(1000, 400);
dropDown.Opening += new CancelEventHandler(DropDown_Opening);
/*
* This is the primary bottleneck for this app, creating all the necessary drop-down menu items.
*
* To optimize performance of this control, this is the main area that needs tuning.
*/
IShengAddressNode curNode = null;
for (int i = 0; i < addressNode.Children.Length; i++)
{
curNode = (IShengAddressNode)addressNode.Children.GetValue(i);
ShengAddressBarDropDownItem tsb = null;
tsb = new ShengAddressBarDropDownItem(curNode.DisplayName, curNode.Icon, NodeButtonClicked);
tsb.AddressNode = curNode;
tsb.Overflow = ToolStripItemOverflow.AsNeeded;
dropDown.Items.Add(tsb); //THIS IS THE BIGGEST BOTTLENECK. LOTS OF TIME SPENT IN/CALLING THIS METHOD!
}
addressNode.DropDownMenu = dropDown;
dropDown.LayoutStyle = ToolStripLayoutStyle.Table;
dropDown.MaximumSize = new Size(1000, 400);
dropDown.AddressNode = addressNode;
//不起作用
dropDown.MouseWheel += new MouseEventHandler(ScrollDropDownMenu);
dropDown.MouseEnter += new EventHandler(GiveToolStripDropDownMenuFocus);
return(dropDown);
}
private void DropDown_Opening(object sender, CancelEventArgs e)
{
ShengAddressBarDropDown dropDown = sender as ShengAddressBarDropDown;
//dropDown.Left = dropDown.Left - 20;
#region 把当前选中项加粗
IShengAddressNode nextAddressNode = null;
for (int i = 0; i < _buttonList.Count; i++)
{
//如果是当前点击的向下箭头
if (_buttonList[i].DropDownButton != null && _buttonList[i].DropDownButton.DropDown == dropDown)
{
//拿出当前点的地址栏按钮向下箭头的下一个地址栏项目
//如果为空，则表示当前点的是最右边的了，那就不去匹配了，也没得匹配
if ((i + 1) < _buttonList.Count)
{
nextAddressNode = _buttonList[i + 1].AddressNode;
break;
}
}
}
if (nextAddressNode != null)
{
foreach (ShengAddressBarDropDownItem item in dropDown.Items)
{
//在使用SetAddress逆向初始化节点时
//会出现item.AddressNode 和 nextAddressNode不是一个对象的情况
//所以需要UniqueID来判断
if (item.AddressNode.UniqueID.Equals(nextAddressNode.UniqueID))
{
item.Font = new Font(item.Font, this._selectedStyle);
break;
}
}
}
#endregion
}
