C# WiFraseC?C自动完成在文本框的中间?
我有一个文本框,可以像这样自动完成:C# WiFraseC?C自动完成在文本框的中间?,c#,winforms,autocomplete,C#,Winforms,Autocomplete,我有一个文本框,可以像这样自动完成: txtName.AutoCompleteMode = AutoCompleteMode.Suggest; txtName.AutoCompleteSource = AutoCompleteSource.CustomSource; txtName.AutoCompleteCustomSource = namesCollection; 它可以工作,但只在文本框的开头。我想在文本框的任何位置自动完成用户输入的任何单词。我对@PaRiMaL RaJ提出的解决方案做
txtName.AutoCompleteMode = AutoCompleteMode.Suggest;
txtName.AutoCompleteSource = AutoCompleteSource.CustomSource;
txtName.AutoCompleteCustomSource = namesCollection;
它可以工作,但只在文本框的开头。我想在文本框的任何位置自动完成用户输入的任何单词。我对@PaRiMaL RaJ提出的解决方案做了一些更改,因为当文本框位于不够高的UserControl内时,列表框没有显示出来。基本上,我没有将列表框添加到文本框的父级,而是添加到表单中,并计算表单中的绝对位置
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
namespace TubeUploader
{
public class AutoCompleteTextBox : TextBox
{
private ListBox _listBox;
private bool _isAdded;
private String[] _values;
private String _formerValue = String.Empty;
public AutoCompleteTextBox()
{
InitializeComponent();
ResetListBox();
}
private void InitializeComponent()
{
_listBox = new ListBox();
KeyDown += this_KeyDown;
KeyUp += this_KeyUp;
}
private void ShowListBox()
{
if (!_isAdded)
{
Parent.Controls.Add(_listBox);
_listBox.Left = Left;
_listBox.Top = Top + Height;
_isAdded = true;
}
_listBox.Visible = true;
_listBox.BringToFront();
}
private void ResetListBox()
{
_listBox.Visible = false;
}
private void this_KeyUp(object sender, KeyEventArgs e)
{
UpdateListBox();
}
private void this_KeyDown(object sender, KeyEventArgs e)
{
switch (e.KeyCode)
{
case Keys.Tab:
{
if (_listBox.Visible)
{
InsertWord((String)_listBox.SelectedItem);
ResetListBox();
_formerValue = Text;
}
break;
}
case Keys.Down:
{
if ((_listBox.Visible) && (_listBox.SelectedIndex < _listBox.Items.Count - 1))
_listBox.SelectedIndex++;
break;
}
case Keys.Up:
{
if ((_listBox.Visible) && (_listBox.SelectedIndex > 0))
_listBox.SelectedIndex--;
break;
}
}
}
protected override bool IsInputKey(Keys keyData)
{
switch (keyData)
{
case Keys.Tab:
return true;
default:
return base.IsInputKey(keyData);
}
}
private void UpdateListBox()
{
if (Text == _formerValue) return;
_formerValue = Text;
String word = GetWord();
if (_values != null && word.Length > 0)
{
String[] matches = Array.FindAll(_values,
x => (x.StartsWith(word, StringComparison.OrdinalIgnoreCase) && !SelectedValues.Contains(x)));
if (matches.Length > 0)
{
ShowListBox();
_listBox.Items.Clear();
Array.ForEach(matches, x => _listBox.Items.Add(x));
_listBox.SelectedIndex = 0;
_listBox.Height = 0;
_listBox.Width = 0;
Focus();
using (Graphics graphics = _listBox.CreateGraphics())
{
for (int i = 0; i < _listBox.Items.Count; i++)
{
_listBox.Height += _listBox.GetItemHeight(i);
// it item width is larger than the current one
// set it to the new max item width
// GetItemRectangle does not work for me
// we add a little extra space by using '_'
int itemWidth = (int)graphics.MeasureString(((String)_listBox.Items[i]) + "_", _listBox.Font).Width;
_listBox.Width = (_listBox.Width < itemWidth) ? itemWidth : _listBox.Width;
}
}
}
else
{
ResetListBox();
}
}
else
{
ResetListBox();
}
}
private String GetWord()
{
String text = Text;
int pos = SelectionStart;
int posStart = text.LastIndexOf(' ', (pos < 1) ? 0 : pos - 1);
posStart = (posStart == -1) ? 0 : posStart + 1;
int posEnd = text.IndexOf(' ', pos);
posEnd = (posEnd == -1) ? text.Length : posEnd;
int length = ((posEnd - posStart) < 0) ? 0 : posEnd - posStart;
return text.Substring(posStart, length);
}
private void InsertWord(String newTag)
{
String text = Text;
int pos = SelectionStart;
int posStart = text.LastIndexOf(' ', (pos < 1) ? 0 : pos - 1);
posStart = (posStart == -1) ? 0 : posStart + 1;
int posEnd = text.IndexOf(' ', pos);
String firstPart = text.Substring(0, posStart) + newTag;
String updatedText = firstPart + ((posEnd == -1) ? "" : text.Substring(posEnd, text.Length - posEnd));
Text = updatedText;
SelectionStart = firstPart.Length;
}
public String[] Values
{
get
{
return _values;
}
set
{
_values = value;
}
}
public List<String> SelectedValues
{
get
{
String[] result = Text.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
return new List<String>(result);
}
}
}
}
public class AutoCompleteTextBox : TextBox
{
private ListBox _listBox;
private bool _isAdded;
private String[] _values;
private String _formerValue = String.Empty;
public AutoCompleteTextBox()
{
InitializeComponent();
ResetListBox();
}
private void InitializeComponent()
{
_listBox = new ListBox();
this.KeyDown += this_KeyDown;
this.KeyUp += this_KeyUp;
}
private void ShowListBox()
{
if (!_isAdded)
{
Form parentForm = this.FindForm(); // new line added
parentForm.Controls.Add(_listBox); // adds it to the form
Point positionOnForm = parentForm.PointToClient(this.Parent.PointToScreen(this.Location)); // absolute position in the form
_listBox.Left = positionOnForm.X;
_listBox.Top = positionOnForm.Y + Height;
_isAdded = true;
}
_listBox.Visible = true;
_listBox.BringToFront();
}
private void ResetListBox()
{
_listBox.Visible = false;
}
private void this_KeyUp(object sender, KeyEventArgs e)
{
UpdateListBox();
}
private void this_KeyDown(object sender, KeyEventArgs e)
{
switch (e.KeyCode)
{
case Keys.Enter:
case Keys.Tab:
{
if (_listBox.Visible)
{
Text = _listBox.SelectedItem.ToString();
ResetListBox();
_formerValue = Text;
this.Select(this.Text.Length, 0);
e.Handled = true;
}
break;
}
case Keys.Down:
{
if ((_listBox.Visible) && (_listBox.SelectedIndex < _listBox.Items.Count - 1))
_listBox.SelectedIndex++;
e.Handled = true;
break;
}
case Keys.Up:
{
if ((_listBox.Visible) && (_listBox.SelectedIndex > 0))
_listBox.SelectedIndex--;
e.Handled = true;
break;
}
}
}
protected override bool IsInputKey(Keys keyData)
{
switch (keyData)
{
case Keys.Tab:
if (_listBox.Visible)
return true;
else
return false;
default:
return base.IsInputKey(keyData);
}
}
private void UpdateListBox()
{
if (Text == _formerValue)
return;
_formerValue = this.Text;
string word = this.Text;
if (_values != null && word.Length > 0)
{
string[] matches = Array.FindAll(_values,
x => (x.ToLower().Contains(word.ToLower())));
if (matches.Length > 0)
{
ShowListBox();
_listBox.BeginUpdate();
_listBox.Items.Clear();
Array.ForEach(matches, x => _listBox.Items.Add(x));
_listBox.SelectedIndex = 0;
_listBox.Height = 0;
_listBox.Width = 0;
Focus();
using (Graphics graphics = _listBox.CreateGraphics())
{
for (int i = 0; i < _listBox.Items.Count; i++)
{
if (i < 20)
_listBox.Height += _listBox.GetItemHeight(i);
// it item width is larger than the current one
// set it to the new max item width
// GetItemRectangle does not work for me
// we add a little extra space by using '_'
int itemWidth = (int)graphics.MeasureString(((string)_listBox.Items[i]) + "_", _listBox.Font).Width;
_listBox.Width = (_listBox.Width < itemWidth) ? itemWidth : this.Width; ;
}
}
_listBox.EndUpdate();
}
else
{
ResetListBox();
}
}
else
{
ResetListBox();
}
}
public String[] Values
{
get
{
return _values;
}
set
{
_values = value;
}
}
public List<String> SelectedValues
{
get
{
String[] result = Text.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
return new List<String>(result);
}
}
}
公共类自动完成文本框:文本框
{
专用列表框(ListBox);;
增加了私人住宅;
私有字符串[]_值;
私有字符串_formerValue=String.Empty;
公共自动完成文本框()
{
初始化组件();
ResetListBox();
}
私有void InitializeComponent()
{
_listBox=新的listBox();
this.KeyDown+=this_KeyDown;
this.KeyUp+=此_KeyUp;
}
私有void ShowListBox()
{
如果(!\u已添加)
{
Form parentForm=this.FindForm();//添加了新行
parentForm.Controls.Add(_listBox);//将其添加到表单中
Point positionOnForm=parentForm.PointToClient(this.Parent.PointToScreen(this.Location));//表单中的绝对位置
_listBox.Left=positionOnForm.X;
_listBox.Top=positionOnForm.Y+高度;
_isAdded=真;
}
_Visible=true;
_listBox.BringToFront();
}
私有void ResetListBox()
{
_listBox.Visible=false;
}
private void this_KeyUp(对象发送方,KeyEventArgs e)
{
UpdateListBox();
}
private void this_KeyDown(对象发送方,KeyEventArgs e)
{
开关(如钥匙代码)
{
大小写键。输入:
案例键。选项卡:
{
如果(_listBox.Visible)
{
Text=_listBox.SelectedItem.ToString();
ResetListBox();
_formerValue=文本;
this.Select(this.Text.Length,0);
e、 已处理=正确;
}
打破
}
案例键。向下:
{
如果((_listBox.Visible)和(_listBox.SelectedIndex<_listBox.Items.Count-1))
_listBox.SelectedIndex++;
e、 已处理=正确;
打破
}
案例密钥。向上:
{
如果((_listBox.Visible)和(_listBox.SelectedIndex>0))
_listBox.SelectedIndex--;
e、 已处理=正确;
打破
}
}
}
受保护的覆盖布尔IsInputKey(Keys keyData)
{
开关(键数据)
{
案例键。选项卡:
如果(_listBox.Visible)
返回true;
其他的
返回false;
违约:
返回base.IsInputKey(keyData);
}
}
私有void UpdateListBox()
{
如果(文本==\u formerValue)
返回;
_formerValue=this.Text;
字符串字=this.Text;
如果(_值!=null&&word.Length>0)
{
string[]matches=Array.FindAll(_值,
x=>(x.ToLower().Contains(word.ToLower());
如果(匹配。长度>0)
{
ShowListBox();
_BeginUpdate();
_listBox.Items.Clear();
ForEach(匹配项,x=>_listBox.Items.Add(x));
_listBox.SelectedIndex=0;
_listBox.Height=0;
_listBox.Width=0;
焦点();
使用(Graphics Graphics=\u listBox.CreateGraphics())
{
对于(int i=0;i<\u listBox.Items.Count;i++)
{
如果(i<20)
_listBox.Height+=\u listBox.GetItemHeight(i);
//它的项目宽度大于当前项目宽度
//将其设置为新的最大项目宽度
//GetItemRectangle对我不起作用
//我们使用“\u1”添加了一点额外的空间
int itemWidth=(int)graphics.MeasureString(((字符串)_listBox.Items[i])+“_”,_listBox.Font).Width;
_listBox.Width=(_listBox.Width
其他解决方案在多行环境中对我不起作用
public class AutoCompleteTextBox : TextBox
{
private ListBox _listBox;
private bool _isAdded;
private String[] _values;
private String _formerValue = String.Empty;
public AutoCompleteTextBox()
{
InitializeComponent();
ResetListBox();
}
private void InitializeComponent()
{
_listBox = new ListBox();
this.KeyDown += this_KeyDown;
this.KeyUp += this_KeyUp;
}
private void ShowListBox()
{
if (!_isAdded)
{
Form parentForm = this.FindForm(); // new line added
parentForm.Controls.Add(_listBox); // adds it to the form
Point positionOnForm = parentForm.PointToClient(this.Parent.PointToScreen(this.Location)); // absolute position in the form
_listBox.Left = positionOnForm.X;
_listBox.Top = positionOnForm.Y + Height;
_isAdded = true;
}
_listBox.Visible = true;
_listBox.BringToFront();
}
private void ResetListBox()
{
_listBox.Visible = false;
}
private void this_KeyUp(object sender, KeyEventArgs e)
{
UpdateListBox();
}
private void this_KeyDown(object sender, KeyEventArgs e)
{
switch (e.KeyCode)
{
case Keys.Enter:
case Keys.Tab:
{
if (_listBox.Visible)
{
Text = _listBox.SelectedItem.ToString();
ResetListBox();
_formerValue = Text;
this.Select(this.Text.Length, 0);
e.Handled = true;
}
break;
}
case Keys.Down:
{
if ((_listBox.Visible) && (_listBox.SelectedIndex < _listBox.Items.Count - 1))
_listBox.SelectedIndex++;
e.Handled = true;
break;
}
case Keys.Up:
{
if ((_listBox.Visible) && (_listBox.SelectedIndex > 0))
_listBox.SelectedIndex--;
e.Handled = true;
break;
}
}
}
protected override bool IsInputKey(Keys keyData)
{
switch (keyData)
{
case Keys.Tab:
if (_listBox.Visible)
return true;
else
return false;
default:
return base.IsInputKey(keyData);
}
}
private void UpdateListBox()
{
if (Text == _formerValue)
return;
_formerValue = this.Text;
string word = this.Text;
if (_values != null && word.Length > 0)
{
string[] matches = Array.FindAll(_values,
x => (x.ToLower().Contains(word.ToLower())));
if (matches.Length > 0)
{
ShowListBox();
_listBox.BeginUpdate();
_listBox.Items.Clear();
Array.ForEach(matches, x => _listBox.Items.Add(x));
_listBox.SelectedIndex = 0;
_listBox.Height = 0;
_listBox.Width = 0;
Focus();
using (Graphics graphics = _listBox.CreateGraphics())
{
for (int i = 0; i < _listBox.Items.Count; i++)
{
if (i < 20)
_listBox.Height += _listBox.GetItemHeight(i);
// it item width is larger than the current one
// set it to the new max item width
// GetItemRectangle does not work for me
// we add a little extra space by using '_'
int itemWidth = (int)graphics.MeasureString(((string)_listBox.Items[i]) + "_", _listBox.Font).Width;
_listBox.Width = (_listBox.Width < itemWidth) ? itemWidth : this.Width; ;
}
}
_listBox.EndUpdate();
}
else
{
ResetListBox();
}
}
else
{
ResetListBox();
}
}
public String[] Values
{
get
{
return _values;
}
set
{
_values = value;
}
}
public List<String> SelectedValues
{
get
{
String[] result = Text.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
return new List<String>(result);
}
}
}
using System;
using System.Drawing;
using System.Windows.Forms;
class MultiLineAutoCompleteTextBox : TextBox
{
private ListBox _listBox;
private bool _isAdded;
private String[] _values;
private String _formerValue = String.Empty;
private int _prevBreak;
private int _nextBreak;
private int _wordLen;
public MultiLineAutoCompleteTextBox()
{
InitializeComponent();
ResetListBox();
}
private void InitializeComponent()
{
_listBox = new ListBox();
KeyDown += this_KeyDown;
KeyUp += this_KeyUp;
}
private void ShowListBox()
{
if (!_isAdded)
{
Form parentForm = FindForm();
if (parentForm == null) return;
parentForm.Controls.Add(_listBox);
Point positionOnForm = parentForm.PointToClient(Parent.PointToScreen(Location));
_listBox.Left = positionOnForm.X;
_listBox.Top = positionOnForm.Y + Height;
_isAdded = true;
}
_listBox.Visible = true;
_listBox.BringToFront();
}
private void ResetListBox()
{
_listBox.Visible = false;
}
private void this_KeyUp(object sender, KeyEventArgs e)
{
UpdateListBox();
}
private void this_KeyDown(object sender, KeyEventArgs e)
{
switch (e.KeyCode)
{
case Keys.Enter:
case Keys.Tab:
case Keys.Space:
{
if (_listBox.Visible)
{
Text = Text.Remove(_prevBreak == 0 ? 0 : _prevBreak + 1, _prevBreak == 0 ? _wordLen + 1 : _wordLen);
Text = Text.Insert(_prevBreak == 0 ? 0 : _prevBreak + 1, _listBox.SelectedItem.ToString());
ResetListBox();
_formerValue = Text;
Select(Text.Length, 0);
e.Handled = true;
}
break;
}
case Keys.Down:
{
if ((_listBox.Visible) && (_listBox.SelectedIndex < _listBox.Items.Count - 1))
_listBox.SelectedIndex++;
e.Handled = true;
break;
}
case Keys.Up:
{
if ((_listBox.Visible) && (_listBox.SelectedIndex > 0))
_listBox.SelectedIndex--;
e.Handled = true;
break;
}
}
}
protected override bool IsInputKey(Keys keyData)
{
switch (keyData)
{
case Keys.Tab:
if (_listBox.Visible)
return true;
else
return false;
default:
return base.IsInputKey(keyData);
}
}
private void UpdateListBox()
{
if (Text == _formerValue) return;
if (Text.Length == 0)
{
_listBox.Visible = false;
return;
}
_formerValue = Text;
var separators = new[] { '|', '[', ']', '\r', '\n', ' ', '\t' };
_prevBreak = Text.LastIndexOfAny(separators, CaretIndex > 0 ? CaretIndex - 1 : 0);
if (_prevBreak < 1) _prevBreak = 0;
_nextBreak = Text.IndexOfAny(separators, _prevBreak + 1);
if (_nextBreak == -1) _nextBreak = CaretIndex;
_wordLen = _nextBreak - _prevBreak - 1;
if (_wordLen < 1) return;
string word = Text.Substring(_prevBreak + 1, _wordLen);
if (_values != null && word.Length > 0)
{
string[] matches = Array.FindAll(_values,
x => (x.ToLower().Contains(word.ToLower())));
if (matches.Length > 0)
{
ShowListBox();
_listBox.BeginUpdate();
_listBox.Items.Clear();
Array.ForEach(matches, x => _listBox.Items.Add(x));
_listBox.SelectedIndex = 0;
_listBox.Height = 0;
_listBox.Width = 0;
Focus();
using (Graphics graphics = _listBox.CreateGraphics())
{
for (int i = 0; i < _listBox.Items.Count; i++)
{
if (i < 20)
_listBox.Height += _listBox.GetItemHeight(i);
// it item width is larger than the current one
// set it to the new max item width
// GetItemRectangle does not work for me
// we add a little extra space by using '_'
int itemWidth = (int)graphics.MeasureString(((string)_listBox.Items[i]) + "_", _listBox.Font).Width;
_listBox.Width = (_listBox.Width < itemWidth) ? itemWidth : Width; ;
}
}
_listBox.EndUpdate();
}
else
{
ResetListBox();
}
}
else
{
ResetListBox();
}
}
public int CaretIndex => SelectionStart;
public String[] Values
{
get
{
return _values;
}
set
{
_values = value;
}
}
}