/// <summary>
/// 重载鼠标弹起事件
/// </summary>
/// <param name="e"></param>
protected override void OnMouseUp(MouseEventArgs e)
{
//探测哪一列被单击并快速处理
const int LVM_FIRST = 0x1000;
const int LVM_SUBITEMHITTEST = LVM_FIRST + 57;
NativeMethods.LVHITTESTINFO hitInfo = new NativeMethods.LVHITTESTINFO();
hitInfo.pt = new Point(e.X, e.Y);
IntPtr pointer = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(NativeMethods.LVHITTESTINFO)));
Marshal.StructureToPtr(hitInfo, pointer, true);
Message message = Message.Create(Handle, LVM_SUBITEMHITTEST, IntPtr.Zero, pointer);
DefWndProc(ref message);
hitInfo = (NativeMethods.LVHITTESTINFO)Marshal.PtrToStructure(
pointer, typeof(NativeMethods.LVHITTESTINFO));
Marshal.FreeHGlobal(pointer);
if (hitInfo.iItem >= 0 && hitInfo.iSubItem == 1)
{
//翻转加载启动标志
PluginListItem item = (PluginListItem)Items[hitInfo.iItem];
item.PluginInfo.IsLoadedAtStartup = !item.PluginInfo.IsLoadedAtStartup;
Invalidate();
return;
}
base.OnMouseUp(e);
}
/// <summary>
/// 用当前已安装的插件填充列表视图
/// </summary>
private void AddPluginList()
{
listView.Items.Clear();
foreach (PluginInfo pi in compiler.Plugins)
{
PluginListItem li = new PluginListItem(pi);
listView.Items.Add(li);
}
}
/// <summary>
/// 卸载插件，失败时显示消息
/// </summary>
private void PluginUnload(PluginListItem pi)
{
try
{
compiler.Unload(pi.PluginInfo);
}
catch (Exception caught)
{
MessageBox.Show("错误:\n\n" + caught.Message, pi.Name + "插件卸载失败！",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
/// <summary>
/// 更新控件使能状态来反映是否可选择
/// </summary>
private void UpdateUIStates()
{
bool isItemSelected = listView.SelectedItems.Count > 0;
buttonUnInstall.Enabled = isItemSelected;
if (!isItemSelected)
{
buttonLoad.Enabled = false;
buttonUnLoad.Enabled = false;
return;
}
PluginListItem item = (PluginListItem)listView.SelectedItems[0];
buttonLoad.Enabled = !item.PluginInfo.IsCurrentlyLoaded;
buttonUnLoad.Enabled = item.PluginInfo.IsCurrentlyLoaded;
}
protected override void WndProc(ref Message m)
{
const int WM_DRAWITEM = 0x002B;
const int WM_REFLECT = 0x2000;
const int ODS_SELECTED = 0x0001;
switch (m.Msg)
{
case WM_REFLECT | WM_DRAWITEM:
{
//从消息参数中获取绘制选项结构体
NativeMethods.DRAWITEMSTRUCT dis = (NativeMethods.DRAWITEMSTRUCT)Marshal.PtrToStructure(
m.LParam, typeof(NativeMethods.DRAWITEMSTRUCT));
// 根据RECT结构体创建一个矩形
Rectangle r = new Rectangle(dis.rcItem.left, dis.rcItem.top,
dis.rcItem.right - dis.rcItem.left, dis.rcItem.bottom - dis.rcItem.top);
//从绘制选项结构体的hdc字段中获取画笔
using (Graphics g = Graphics.FromHdc(dis.hdc))
{
//采用默认状态创建一个新的绘制选项状态
DrawItemState d = DrawItemState.Default;
//设置绘制的正确状态
if ((dis.itemState & ODS_SELECTED) > 0)
{
d = DrawItemState.Selected;
}
//创建绘制选项事件参数对象
PluginListItem item = (PluginListItem)Items[dis.itemID];
DrawItemEventArgs e = new DrawItemEventArgs(g, this.Font, r, dis.itemID, d);
OnDrawItem(e, item);
//处理消息
m.Result = (IntPtr)1;
}
break;
}
default:
base.WndProc(ref m);
break;
}
}
/// <summary>
/// 绘制列表项
/// </summary>
protected void OnDrawItem(DrawItemEventArgs e, PluginListItem item)
{
e.DrawBackground();
//正在运行状态的位图
const int imageWidth = 16 + 3;
if (imageList == null)
{
if (this.Parent is PluginDialog)
{
imageList = ((PluginDialog)Parent).ImageList;
}
else if (this.Parent.Parent is PluginDialog)
{
imageList = ((PluginDialog)Parent.Parent).ImageList;
}
else
{
return;
}
}
if (imageList != null)
{
int imageIndex = item.PluginInfo.IsCurrentlyLoaded ? 0 : 1;
imageList.Draw(e.Graphics, e.Bounds.Left + 2, e.Bounds.Top + 1, imageIndex);
}
//名称
Rectangle bounds = Rectangle.FromLTRB(e.Bounds.Left + imageWidth,
e.Bounds.Top, e.Bounds.Left + Columns[0].Width, e.Bounds.Bottom);
using (Brush brush = new SolidBrush(e.ForeColor))
e.Graphics.DrawString(item.Name, e.Font, brush, bounds);
//复选框
bounds = Rectangle.FromLTRB(bounds.Right + 1,
bounds.Top, bounds.Right + Columns[1].Width + 1, bounds.Bottom - 1);
ButtonState state = item.PluginInfo.IsLoadedAtStartup ? ButtonState.Checked : ButtonState.Normal;
ControlPaint.DrawCheckBox(e.Graphics, bounds, state);
}
/// <summary>
/// 列表选中项改变时，更新界面信息
/// </summary>
private void listView_SelectedIndexChanged(object sender, EventArgs e)
{
//重置相关描述信息
description.Text = "";
developer.Text = "";
webSite.Text = "";
//更新UI状态
UpdateUIStates();
if (listView.SelectedItems.Count != 1)
{
return;
}
PluginListItem item = (PluginListItem)listView.SelectedItems[0];
//设置相关描述信息
description.Text = item.PluginInfo.Description;
developer.Text = item.PluginInfo.Developer;
webSite.Text = item.PluginInfo.WebSite;
}