//建议在该方法内添加菜单项。用HandleCreated事件也行
protected override void OnHandleCreated(EventArgs e)
{
base.OnHandleCreated(e);
//取得窗体菜单句柄
var hMenu = SystemMenuUtil.GetSystemMenuHandle(this);
//添加分隔条
SystemMenuUtil.AddSeparator(hMenu);
//添加普通项
SystemMenuUtil.AddItem(hMenu, "普通项", item_Clicked);
//添加一个能展开子菜单的项在【关闭】之上
SystemMenuUtil.AddDropDown(hMenu, "展开菜单", contextMenu1, SystemMenuStandardItem.Close);
//再添加一个勾选项演示勾选状态的处理
SystemMenuUtil.AddItem(hMenu, "窗口置顶", (_, ee) =>
{
//注意这里获取到的是项原本的勾选状态
var isChecked = ee.Info.Checked;
//所以原本是勾选的话，意味着要取消置顶，反之亦然
TopMost = !isChecked;
WriteMessage($"窗口已{(isChecked ? "取消" : "")}置顶");
//最后切换勾选状态
SystemMenuUtil.SetItemChecked(ee.Info.ParentMenuHandle, ee.Info.Id, false, !isChecked);
});
SystemMenuUtil.AddItem(hMenu, "作者主页", (_, __) => Process.Start("https://www.cnblogs.com/ahdung/p/SystemMenuUtil.html"));
}
private void btnGetItemInfos_Click(object sender, EventArgs e)
{
var i = 0;
foreach (var info in SystemMenuUtil.GetItemInfos(HMenu))
{
WriteMessage($"#{i++}{Environment.NewLine}{FormatItemInfo(info)}");
}
}
private void btnSetItemEnabled_Click(object sender, EventArgs e)
{
var item = DetermineItem(out var byPosition);
var info = SystemMenuUtil.GetItemInfo(HMenu, item, byPosition);
if (info == null)
{
WriteMessage("项不存在！");
return;
}
SystemMenuUtil.SetItemEnabled(HMenu, item, byPosition, !info.Enabled);
WriteMessage($"项已{(info.Enabled ? "禁用" : "启用")}");
}
//建议在该方法内重置菜单项。主要目的是释放无效项占用的资源，用HandleDestroyed事件也行
protected override void OnHandleDestroyed(EventArgs e)
{
base.OnHandleDestroyed(e);
SystemMenuUtil.Reset(this);
}
private void btnGetSystemMenuHandle_Click(object sender, EventArgs e)
{
WriteMessage($"当前窗体菜单句柄: {SystemMenuUtil.GetSystemMenuHandle(this)}");
}
private void btnGetMenuItemCount_Click(object sender, EventArgs e)
{
var count = SystemMenuUtil.GetMenuItemCount(HMenu);
WriteMessage($"当前窗体菜单共有 {count} 项");
}
private void btnGetItemInfo_Click(object sender, EventArgs e)
{
var info = SystemMenuUtil.GetItemInfo(HMenu, DetermineItem(out var byPosition), byPosition);
WriteItemInfo(info);
}
private void btnReset_Click(object sender, EventArgs e)
{
SystemMenuUtil.Reset(this);
WriteMessage("窗体菜单已重置");
}
private void btnRemoveItem_Click(object sender, EventArgs e)
{
SystemMenuUtil.RemoveItem(HMenu, DetermineItem(out var byPosition), byPosition);
WriteMessage("项已移除");
}
private void btnSetItemText_Click(object sender, EventArgs e)
{
SystemMenuUtil.SetItemText(HMenu, DetermineItem(out var byPosition), byPosition, txbChangeItemText.Text);
WriteMessage($"项文本已修改为【{txbChangeItemText.Text}】");
}
private void btnAddSeparator_Click(object sender, EventArgs e)
{
var id = SystemMenuUtil.AddSeparator(HMenu, DetermineItem(out var byPosition), byPosition);
WriteMessage($"已添加分隔条，ID: {id}");
}
private void btnAddDropDown_Click(object sender, EventArgs e)
{
var id = SystemMenuUtil.AddDropDown(HMenu, txbNewDropDownText.Text, contextMenu1, DetermineItem(out var byPosition), byPosition);
WriteMessage($"已添加展开项【{txbNewDropDownText.Text}】，ID: {id}");
}
private void btnAddItem_Click(object sender, EventArgs e)
{
var id = SystemMenuUtil.AddItem(HMenu, txbNewItemText.Text, item_Clicked, null, DetermineItem(out var byPosition), byPosition);
WriteMessage($"已添加普通项【{txbNewItemText.Text}】，ID: {id}");
}