c#为RichTextBox添加自动补全功能
本文关键字：全功能 添加 RichTextBox | 更新日期: 2023-09-27 18:12:48
我有一个数字列表，我想让一个RichTextBox与自动完成，所以当用户开始输入一个数字，它会给他自动完成选项从列表。
我希望它在RichTextBox中因为我希望用户能够在RichTextBox的新行中书写每个数字，所以每次用户按回车键时，它都会重新完成整个自动补全过程
我真不知道该怎么做这件事。如有任何帮助，我将不胜感激。谢谢
我将代码粘贴到这里。我从来没有得到过正确的盒子的位置，所以你将不得不使用YOffset和XOffset。
在你的表单OnLoad:intellisenseRichTextBox.IntellisenseWords = new string[] { "Test", "Foo", "Bar", "Supercalifragilisticexpialidocious" };
intellisenseRichTextBox.YOffset = 132;
intellisenseRichTextBox.XOffset = 70;
和类:
public class NotificationForm : Form
{
public NotificationForm()
{
this.ShowInTaskbar = false;
//this.Enabled = true;
this.FormBorderStyle = FormBorderStyle.None;
}
protected override bool ShowWithoutActivation
{
get
{
return true;
}
}
protected override CreateParams CreateParams
{
get
{
CreateParams baseParams = base.CreateParams;
const int WS_EX_NOACTIVATE = 0x08000000;
const int WS_EX_TOOLWINDOW = 0x00000080;
baseParams.ExStyle |= (int)(WS_EX_NOACTIVATE | WS_EX_TOOLWINDOW);
return baseParams;
}
}
}
public class RichTextBoxIntellisense : RichTextBox
{
private NotificationForm intelliAutoCompleteForm;
private ListBox intelliAutoCompleteListBox;
private bool IsNotificationFormShowing;
private bool IsFromReplaceTab;
private bool IsFromMouseClick;
private int _suggestionCount = 20;
public string[] IntellisenseWords { get; set; }
public int YOffset { get; set; }
public int XOffset { get; set; }
public int SuggestionCount
{
get
{
return _suggestionCount;
}
set
{
_suggestionCount = value;
}
}
public RichTextBoxIntellisense()
{
this.AcceptsTab = true;
this.YOffset = 30;
intelliAutoCompleteForm = new NotificationForm();
intelliAutoCompleteForm.Size = new Size(200, 200);
intelliAutoCompleteForm.TopMost = true;
intelliAutoCompleteListBox = new ListBox();
intelliAutoCompleteListBox.Dock = DockStyle.Fill;
intelliAutoCompleteForm.Controls.Add(intelliAutoCompleteListBox);
this.TextChanged += RichTextBoxIntellisense_TextChanged;
this.KeyDown += RichTextBoxIntellisense_KeyDown;
this.KeyPress += RichTextBoxIntellisense_KeyPress;
this.SelectionChanged += RichTextBoxIntellisense_SelectionChanged;
intelliAutoCompleteListBox.Click += IntelliAutoCompleteListBox_Click;
intelliAutoCompleteListBox.SelectedIndexChanged += IntelliAutoCompleteListBox_SelectedIndexChanged;
intelliAutoCompleteForm.Show();
intelliAutoCompleteForm.Hide();
}
private void IntelliAutoCompleteListBox_SelectedIndexChanged(object sender, EventArgs e)
{
if(IsFromMouseClick)
{
if (intelliAutoCompleteListBox.SelectedIndex >= 0)
{
ReplaceCurrentWordWith(intelliAutoCompleteListBox.SelectedItem.ToString());
IsFromReplaceTab = false;
}
}
IsFromMouseClick = false;
}
private void IntelliAutoCompleteListBox_Click(object sender, EventArgs e)
{
IsFromMouseClick = true;
}
private void RichTextBoxIntellisense_SelectionChanged(object sender, EventArgs e)
{
intelliAutoCompleteForm.Hide();
IsNotificationFormShowing = false;
}
private void RichTextBoxIntellisense_KeyPress(object sender, KeyPressEventArgs e)
{
if (IsFromReplaceTab)
{
e.Handled = true;
IsFromReplaceTab = false;
}
else
{
if(e.KeyChar == (char)Keys.Escape)
{
intelliAutoCompleteForm.Hide();
IsNotificationFormShowing = false;
e.Handled = true;
}
}
}
private void RichTextBoxIntellisense_KeyDown(object sender, KeyEventArgs e)
{
if (IsNotificationFormShowing)
{
if (e.KeyCode == Keys.Up)
{
if(intelliAutoCompleteListBox.Items.Count > 0)
{
if(intelliAutoCompleteListBox.SelectedIndex < 0)
{
intelliAutoCompleteListBox.SelectedIndex = 0;
}
else if(intelliAutoCompleteListBox.SelectedIndex > 0)
{
intelliAutoCompleteListBox.SelectedIndex = intelliAutoCompleteListBox.SelectedIndex - 1;
}
}
e.Handled = true;
}
else if (e.KeyCode == Keys.Down)
{
if (intelliAutoCompleteListBox.Items.Count > 0)
{
if (intelliAutoCompleteListBox.SelectedIndex < 0)
{
intelliAutoCompleteListBox.SelectedIndex = 0;
}
else if (intelliAutoCompleteListBox.SelectedIndex < intelliAutoCompleteListBox.Items.Count - 1)
{
intelliAutoCompleteListBox.SelectedIndex = intelliAutoCompleteListBox.SelectedIndex + 1;
}
}
e.Handled = true;
}
else if (e.KeyCode == Keys.Enter)
{
if(intelliAutoCompleteListBox.SelectedIndex >= 0)
{
ReplaceCurrentWordWith(intelliAutoCompleteListBox.SelectedItem.ToString());
}
e.Handled = true;
}
else if (e.KeyCode == Keys.Tab)
{
if (intelliAutoCompleteListBox.SelectedIndex >= 0)
{
ReplaceCurrentWordWith(intelliAutoCompleteListBox.SelectedItem.ToString());
}
e.Handled = true;
}
}
}
private void RichTextBoxIntellisense_TextChanged(object sender, EventArgs e)
{
if (IntellisenseWords != null && IntellisenseWords.Length > 0)
{
string wordText;
int lastIndexOfSpace;
int lastIndexOfNewline;
int lastIndexOfTab;
int lastIndexOf;
if(this.SelectionStart == this.Text.Length)
{
if(this.SelectionStart > 0 && this.Text[this.SelectionStart - 1] != ' ' && this.Text[this.SelectionStart - 1] != ''t' && this.Text[this.SelectionStart - 1] != ''n')
{
wordText = this.Text.Substring(0,this.SelectionStart);
lastIndexOfSpace = wordText.LastIndexOf(' ');
lastIndexOfNewline = wordText.LastIndexOf(''n');
lastIndexOfTab = wordText.LastIndexOf(''t');
lastIndexOf = Math.Max(Math.Max(lastIndexOfSpace,lastIndexOfNewline),lastIndexOfTab);
if (lastIndexOf >= 0)
{
wordText = wordText.Substring(lastIndexOf + 1);
}
if (PopulateIntelliListBox(wordText))
{
ShowAutoCompleteForm();
}
else
{
intelliAutoCompleteForm.Hide();
IsNotificationFormShowing = false;
}
}
else
{
intelliAutoCompleteForm.Hide();
IsNotificationFormShowing = false;
}
}
else
{
char currentChar = this.Text[this.SelectionStart];
if(this.SelectionStart > 0)
{
if(this.SelectionStart > 0 && this.Text[this.SelectionStart - 1] != ' ' && this.Text[this.SelectionStart - 1] != ''t' && this.Text[this.SelectionStart - 1] != ''n'
&& (this.Text[this.SelectionStart] == ' ' || this.Text[this.SelectionStart] == ''t' || this.Text[this.SelectionStart] == ''n'))
{
wordText = this.Text.Substring(0, this.SelectionStart);
lastIndexOfSpace = wordText.LastIndexOf(' ');
lastIndexOfNewline = wordText.LastIndexOf(''n');
lastIndexOfTab = wordText.LastIndexOf(''t');
lastIndexOf = Math.Max(Math.Max(lastIndexOfSpace, lastIndexOfNewline), lastIndexOfTab);
if (lastIndexOf >= 0)
{
wordText = wordText.Substring(lastIndexOf + 1);
}
if(PopulateIntelliListBox(wordText))
{
ShowAutoCompleteForm();
}
else
{
intelliAutoCompleteForm.Hide();
IsNotificationFormShowing = false;
}
}
else
{
intelliAutoCompleteForm.Hide();
IsNotificationFormShowing = false;
}
}
else
{
intelliAutoCompleteForm.Hide();
IsNotificationFormShowing = false;
}
}
}
else
{
intelliAutoCompleteForm.Hide();
IsNotificationFormShowing = false;
}
}
private bool PopulateIntelliListBox(string wordTyping)
{
intelliAutoCompleteListBox.Items.Clear();
List<KeyValuePair<int, string>> tempWords = new List<KeyValuePair<int, string>>();
string[] outArray;
for(int i = 0; i < IntellisenseWords.Length; i++)
{
if(IntellisenseWords[i].StartsWith(wordTyping, StringComparison.CurrentCultureIgnoreCase))
{
tempWords.Add(new KeyValuePair<int, string>(1, IntellisenseWords[i]));
}
}
if(tempWords.Count < _suggestionCount && wordTyping.Length > 1)
{
for (int i = 0; i < IntellisenseWords.Length; i++)
{
if (IntellisenseWords[i].Contains(wordTyping, StringComparison.CurrentCultureIgnoreCase))
{
if(tempWords.Count(c => c.Value == IntellisenseWords[i]) == 0)
{
tempWords.Add(new KeyValuePair<int, string>(2, IntellisenseWords[i]));
}
}
}
}
outArray = tempWords.OrderBy(o => o.Key).Take(_suggestionCount).Select(s => s.Value).ToArray();
intelliAutoCompleteListBox.Items.AddRange(outArray);
return outArray.Length > 0;
}
private void ShowAutoCompleteForm()
{
Point tmpPoint = this.PointToClient(this.Location);
Point tmpSelPoint = this.GetPositionFromCharIndex(this.SelectionStart);
intelliAutoCompleteForm.Location = new Point((-1 * tmpPoint.X) + tmpSelPoint.X + this.XOffset, (-1 * tmpPoint.Y) + tmpSelPoint.Y + this.Margin.Top + this.YOffset);
intelliAutoCompleteForm.Show();
IsNotificationFormShowing = true;
this.Focus();
}
private void ReplaceCurrentWordWith(string Word)
{
string startString = "";
string endString = this.Text.Substring(this.SelectionStart);
string wordText = this.Text.Substring(0, this.SelectionStart);
int lastIndexOfSpace = wordText.LastIndexOf(' ');
int lastIndexOfNewline = wordText.LastIndexOf(''n');
int lastIndexOfTab = wordText.LastIndexOf(''t');
int lastIndexOf = Math.Max(Math.Max(lastIndexOfSpace, lastIndexOfNewline), lastIndexOfTab);
if (lastIndexOf >= 0)
{
startString = wordText.Substring(0, lastIndexOf + 1);
wordText = wordText.Substring(lastIndexOf + 1);
}
this.Text = String.Format("{0}{1} {2}", startString, Word, endString);
if(lastIndexOf >= 0)
{
this.SelectionStart = startString.Length + Word.Length + 1;
}
else
{
this.SelectionStart = Word.Length + 1;
}
IsFromReplaceTab = true;
}
}