/// <summary>
/// Updates a CheckedListBox based on items in a folder and a dictionary. Also updates the dictonary.
/// </summary>
/// <param name="clb">CheckedListBox to update</param>
/// <param name="checked_items">Dictionary containing checked/unchecked items</param>
/// <param name="folder_path">Path to query files from</param>
/// <param name="filter_string">Only filenames matching the filter_string are added</param>
/// <param name="only_show_chosen">Only show files which are ticked</param>
private void UpdateChosenList(CheckedListBox clb, Dictionary <string, bool> checked_items, string folder_path, string filter_string, bool only_show_chosen)
{
clb.Enabled = false;
clb.Hide();
string[] files = Directory.GetFiles(folder_path);
int old_index = clb.SelectedIndex;
string old_item = "";
string old_top_item = "";
if (clb.SelectedItem != null)
{
old_item = clb.SelectedItem.ToString();
}
if (clb.Items.Count != 0)
{
old_top_item = clb.Items[clb.TopIndex].ToString();
}
clb.Items.Clear();
List <string> filtered_filenames = new List <string>();
//Filter queried files
if (filter_string != "")
{
foreach (string file in files)
{
if (file.ToLower().Contains(filter_string.ToLower()))
{
filtered_filenames.Add(file);
}
}
}
else
{
filtered_filenames.AddRange(files);
}
// We change the selected index here without wanting to fire the event handler again
dont_update_list = true;
int new_top_index = 0;
//For each item, add the checked state if found in Dictionary
foreach (string file in filtered_filenames)
{
string file_split = file.Split('\\')[1];
if (checked_items.ContainsKey(file_split))
{
if (only_show_chosen)
{
if (checked_items[file_split] == true)
{
clb.Items.Add(file_split, checked_items[file_split]);
if (file_split == old_item)
{
clb.SelectedIndex = clb.Items.Count - 1;
}
if (file_split == old_top_item)
{
new_top_index = clb.Items.Count - 1;
}
}
}
else
{
clb.Items.Add(file_split, checked_items[file_split]);
if (file_split == old_item)
{
clb.SelectedIndex = clb.Items.Count - 1;
}
if (file_split == old_top_item)
{
new_top_index = clb.Items.Count - 1;
}
}
}
else
{
//Dictionary entry is not there -> file is new. Add entry
checked_items.Add(file_split, false);
if (only_show_chosen == false)
{
clb.Items.Add(file_split, false);
}
}
}
// clb.Update();
dont_update_list = true;
clb.TopIndex = new_top_index;
dont_update_list = false;
clb.Enabled = true;
clb.Show();
}
/// <summary>
/// 打开选项列表，刷新下来菜单
/// </summary>
/// <param name="e"></param>
protected override void OnDropDown(EventArgs e)
{
if (lst.Items.Count == 0)
{
// 假如数据还没有加载
// 那么加载.
lst.BeginUpdate();
for (int i = 0; i < this.CheckAbleItemList.Count; i++)
{
lst.Items.Add(this.CheckAbleItemList[i]);
}
lst.EndUpdate();
lst.ItemHeight = this.ItemHeight;
lst.BorderStyle = BorderStyle.FixedSingle;
lst.Size = new Size(this.DropDownWidth, this.ItemHeight * (this.MaxDropDownItems - 1) - (int)this.ItemHeight / 2);
lst.Location = new Point(this.Left, this.Top + this.ItemHeight + 6);
this.Parent.Controls.Add(lst);
// 加这句话的目的， 是为了避免 控件被别的控件挡住.
lst.BringToFront();
}
if (lstShowFlag == CheckedListBoxShowMode.Hide)
{
// 当前未显示，调整为显示.
lst.Show();
lst.Focus();
lstShowFlag = CheckedListBoxShowMode.Show;
}
else if (lstShowFlag == CheckedListBoxShowMode.Show)
{
// 当前已显示，调整为不显示.
lst.Hide();
lstShowFlag = CheckedListBoxShowMode.Hide;
}
else if (lstShowFlag == CheckedListBoxShowMode.LostFocus)
{
// 当前是 CheckedListBox 失去输入焦点.
// 对于失去焦点的情况.
// 需要作判断
// 因为 可能是点到其它的控件，而 CheckedListBox 失去输入焦点.
// 也可能是 直接从 CheckedListBox 点到本控件.
if (DateTime.Now.AddMilliseconds(-250) > lastLostFocusDateTime)
{
// 如果 CheckedListBox 失去焦点的时间
// 与本次点击下拉列表的时间
// 间隔超过 250 毫秒
// 认为是 经过了另外一个控件.
// 现在点击回来了，需要显示.
lst.Show();
lst.Focus();
lstShowFlag = CheckedListBoxShowMode.Show;
}
else
{
// 是直接从 CheckedListBox 失去焦点
// 然后再点击了 本 ComboBox 控件.
lstShowFlag = CheckedListBoxShowMode.Hide;
}
}
}