智能感知的真实定位
我正在使用windows窗体中的代码编辑器，我已经在richtextbox中的“textindex”下面创建了intellisense位置
richtextbox（rtb）作为代码编辑器和列表框（lb）充当 上下文提示。
这里的预览：
使用此代码：
//ContextHint Location
Point point = this.rtb.GetPositionFromCharIndex(rtb.SelectionStart);
using (Graphics g = this.rtb.CreateGraphics())
{
point.Y += (int)g.MeasureString(" ", rtb.Font).Height + 10; // the 10 is padding
}
this.lb.Location = point;
//-------------------
但问题是我想这样做：
！
如果你能看到标签完全是在starttext而不是startindex。
我已经尝试过了：
Point point = this.rtb.GetPositionFromCharIndex(rtb.SelectionStart - 2);
但是当我只在richtextbox中输入2个字符时，它就是准确的，我添加它的时间再次移动，并且我添加的文字越多它移动的越多。
现在我的问题是关于如何使它成为一种方式，即上下文提示将是起始文本而不是移动，并且当我在“空间”之后重新输入另一个单词时，它将再次以精确文本移动。就像在实际的编译器/代码编辑器中一样。
请帮助。谢谢你们！
2 个答案:
答案 0 :(得分：1)
您必须获取当前单词开始的索引。这是一个简单的函数，用于在当前选择之前查找第一个空格。你可以扩展它以匹配你想要的任何角色：
int pos;
for(pos = rtb.SelectionStart; pos > 0; --pos)
{
if (rtb.Text[pos] == ' ')
{
++pos;
break;
}
}
//You can now use pos as the index
Point point = this.rtb.GetPositionFromCharIndex(pos);
答案 1 :(得分：1)
您可以查看以下代码行：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
namespace CodeEditor
{
public partial class Form1 : Form
{
#region Variables
private Dictionary<string, string> hintTexts = new Dictionary<string, string>();
private string strCurrentHintText = null;
private Font hintFont = new Font("Microsoft Sans Serif", 8.25f);
private Brush hintTextColor = Brushes.Black;
private Point hintTextLocation = new Point(2, 2);
public Point ptCurrentCharPosition;
Point ptHintLocation;
int intCurrentCursorPosition = 0;
int intCurrentSelectionLength = 0;
List<int> lstIntLeftParenthesisCharIndexes = new List<int>();
#endregion
#region Properties
#region Hint
/// <summary>
/// Sets the font of the hint texts.
/// </summary>
public Font HintFont
{
protected get
{
return hintFont;
}
set
{
hintFont = value;
}
}
/// <summary>
/// Sets the color of the hint texts.
/// </summary>
public Brush HintTextColor
{
protected get
{
return hintTextColor;
}
set
{
hintTextColor = value;
}
}
/// <summary>
/// Sets the location of the hint texts.
/// </summary>
public Point HintTextLocation
{
protected get
{
return hintTextLocation;
}
set
{
hintTextLocation = value;
}
}
/// <summary>
/// Gets and Sets the texts of the hints.
/// </summary>
public Dictionary<string, string> HintTexts
{
get
{
return hintTexts;
}
set
{
hintTexts = value;
}
}
#endregion
#endregion
public Form1()
{
InitializeComponent();
}
#region Methods
#region GetChar
/// <summary>
/// Specifies current char based on the cursor position.
/// </summary>
/// <param name="rtb">A RichTextBox control</param>
/// <returns>Returns a char.</returns>
public char GetChar(System.Windows.Forms.RichTextBox rtb)
{
return GetChar(rtb.SelectionStart, rtb);
}
/// <summary>
/// Specifies a char based on the specified position.
/// </summary>
/// <param name="intCharIndex">A position coordinates</param>
/// <param name="rtb">A RichTextBox control</param>
/// <returns>Returns a char.</returns>
public char GetChar(Point ptCurrentPosition, System.Windows.Forms.RichTextBox rtb)
{
return rtb.GetCharFromPosition(ptCurrentPosition);
}
/// <summary>
/// Specifies a char based on the specified index.
/// </summary>
/// <param name="intCharIndex">A char index</param>
/// <param name="rtb">A RichTextBox control</param>
/// <returns>Returns a char.</returns>
public char GetChar(int intCharIndex, System.Windows.Forms.RichTextBox rtb)
{
if (intCharIndex > 0 && rtb.GetPositionFromCharIndex(intCharIndex).X == 0 && rtb.GetPositionFromCharIndex(intCharIndex).Y == 0)
{
return '▓'; // Invalid char
}
if (intCharIndex != rtb.TextLength)
{
ptCurrentCharPosition = rtb.GetPositionFromCharIndex(intCharIndex - 1);
}
else
{
ptCurrentCharPosition = rtb.GetPositionFromCharIndex(intCharIndex);
}
return GetChar(ptCurrentCharPosition, rtb);
}
#endregion
/// <summary>
/// Find the text (keyword) before the specific character.
/// </summary>
/// <param name="rtb">A RichTextBox control</param>
/// <param name="intKeyValue">The value of the pressed key</param>
/// <param name="strText">The text (keyword) before last typed character for checking it</param>
/// <returns>Returns found text (keyword).</returns>
private string FindKeyword(System.Windows.Forms.RichTextBox rtb, int intKeyValue, string strText)
{
string strSelectedText = null;
try
{
if (intKeyValue == 57) // ( char
{
if (rtb.SelectionStart - 1 >= 0)
{
rtb.SelectionStart--;
rtb.SelectionLength = 1;
}
if (rtb.SelectionStart - strText.Length >= 0)
{
rtb.SelectionStart -= strText.Length;
rtb.SelectionLength = strText.Length;
}
strSelectedText = rtb.SelectedText;
if (rtb.SelectionStart - strText.Length >= 0)
{
rtb.SelectionStart += strText.Length;
rtb.SelectionLength = 1;
}
if (rtb.SelectionStart - 1 >= 0)
{
rtb.SelectionStart++;
rtb.SelectionLength = 0;
}
}
}
catch
{
}
return strSelectedText;
}
/// <summary>
/// Displays a hint in the current cursor position.
/// </summary>
/// <param name="ttip">A ToolTip control</param>
/// <param name="rtb">A RichTextBox control</param>
/// <param name="intKeyValue">The value of the pressed key</param>
/// <param name="strCheckingText">The text (keyword) before last typed character for checking it and diplaying its related hint</param>
/// <param name="strHintText">The text of the hint for current keyword</param>
private void ShowHint(ToolTip ttip, System.Windows.Forms.RichTextBox rtb, int intKeyValue, string strCheckingText, string strHintText)
{
try
{
if (rtb.SelectionStart - 1 >= 0)
{
rtb.SelectionStart--;
rtb.SelectionLength = 1;
}
if (intKeyValue == 57) // ( char
{
if (rtb.SelectionStart - strCheckingText.Length >= 0)
{
rtb.SelectionStart -= strCheckingText.Length;
rtb.SelectionLength = strCheckingText.Length;
}
if (rtb.SelectedText == strCheckingText)
{
rtb.SelectionStart += strCheckingText.Length;
rtb.SelectionLength = 1;
lstIntLeftParenthesisCharIndexes.Add(rtb.SelectionStart);
}
if (GetChar(lstIntLeftParenthesisCharIndexes.Last() + 1, rtb) != '(')
{
lstIntLeftParenthesisCharIndexes.Remove(lstIntLeftParenthesisCharIndexes.Count - 1);
}
ttip.ShowAlways = true;
ttip.OwnerDraw = true;
intCurrentCursorPosition = rtb.SelectionStart;
intCurrentSelectionLength = rtb.SelectionLength;
rtb.SelectionStart += rtb.SelectionLength - 1;
rtb.SelectionLength = 0;
GetChar(rtb);
ptHintLocation = ptCurrentCharPosition;
ptHintLocation.X += 2;
ptHintLocation.X += TextRenderer.MeasureText(rtb.Lines[0], rtb.Font).Height;
ptHintLocation.Y += 1;
ptHintLocation.Y += 2;
ptHintLocation.Y += TextRenderer.MeasureText(rtb.Lines[0], rtb.Font).Height;
rtb.SelectionStart = intCurrentCursorPosition;
rtb.SelectionLength = intCurrentSelectionLength;
strCurrentHintText = strHintText;
ttip.Draw += new System.Windows.Forms.DrawToolTipEventHandler(ttipHint_Draw);
ttip.Popup += new System.Windows.Forms.PopupEventHandler(ttipHint_Popup);
if (rtb.SelectionStart - strCheckingText.Length >= 0)
{
rtb.SelectionStart -= strCheckingText.Length;
rtb.SelectionLength = strCheckingText.Length;
}
if (rtb.SelectedText == strCheckingText)
{
rtb.SelectionStart += strCheckingText.Length;
rtb.SelectionStart++;
rtb.SelectionLength = 0;
try
{
HintTexts.Add(strCheckingText, strHintText);
}
catch
{
for (int intCntr = 0; intCntr < HintTexts.Count; intCntr++)
{
if (HintTexts.ElementAt(intCntr).Key == strCheckingText)
{
strCheckingText += intCntr + 1;
}
}
HintTexts.Add(strCheckingText, strHintText);
}
ttip.Show(strHintText, rtb, ptHintLocation);
rtb.SelectionStart--;
rtb.SelectionLength = 1;
}
}
else if (intKeyValue == 48) // ) char
{
lstIntLeftParenthesisCharIndexes.Remove(lstIntLeftParenthesisCharIndexes.Count - 1);
HintTexts.Remove(HintTexts.Last().Key);
if (lstIntLeftParenthesisCharIndexes.Count == 0)
{
ttip.ShowAlways = false;
ttip.RemoveAll();
ttip.Draw -= ttipHint_Draw;
ttip.Popup -= ttipHint_Popup;
}
else
{
try
{
strCurrentHintText = HintTexts.Last().Value;
ttip.Show(HintTexts.Last().Value, rtb, ptHintLocation);
}
catch
{
ttip.ShowAlways = false;
ttip.RemoveAll();
ttip.Draw -= ttipHint_Draw;
ttip.Popup -= ttipHint_Popup;
}
}
}
else if (intKeyValue == 13) // New Line char (Enter/Return key)
{
if (ttip.ShowAlways)
{
GetChar(rtb);
ptHintLocation = ptCurrentCharPosition;
ptHintLocation.Y -= TextRenderer.MeasureText(strHintText, HintFont).Height + HintTextLocation.Y;
ttip.Show(strHintText, rtb, ptHintLocation);
}
}
else if (intKeyValue == 8) // Backspace key
{
for (int intCntr = 0; intCntr < lstIntLeftParenthesisCharIndexes.Count; intCntr++)
{
char chr = GetChar(lstIntLeftParenthesisCharIndexes[intCntr] + 1, rtb);
if (GetChar(lstIntLeftParenthesisCharIndexes[intCntr] + 1, rtb) != '(')
{
lstIntLeftParenthesisCharIndexes.Remove(lstIntLeftParenthesisCharIndexes[intCntr]);
}
}
ttip.ShowAlways = false;
ttip.RemoveAll();
ttip.Draw -= ttipHint_Draw;
ttip.Popup -= ttipHint_Popup;
}
if (rtb.SelectionStart - 1 >= 0)
{
rtb.SelectionStart++;
rtb.SelectionLength = 0;
}
}
catch
{
if (intKeyValue == 8) // Backspace
{
for (int intCntr = 0; intCntr < lstIntLeftParenthesisCharIndexes.Count; intCntr++)
{
char chr = GetChar(lstIntLeftParenthesisCharIndexes[intCntr] + 1, rtb);
if (GetChar(lstIntLeftParenthesisCharIndexes[intCntr] + 1, rtb) != '(')
{
lstIntLeftParenthesisCharIndexes.Remove(lstIntLeftParenthesisCharIndexes[intCntr]);
}
}
ttip.ShowAlways = false;
ttip.RemoveAll();
ttip.Draw -= ttipHint_Draw;
ttip.Popup -= ttipHint_Popup;
}
}
}
#endregion
#region Events
private void ttipHint_Popup(object sender, PopupEventArgs e)
{
e.ToolTipSize = new Size(TextRenderer.MeasureText(strCurrentHintText, HintFont).Width + (HintTextLocation.X * 2),
TextRenderer.MeasureText(strCurrentHintText, HintFont).Height + (HintTextLocation.Y * 2));
}
private void ttipHint_Draw(object sender, DrawToolTipEventArgs e)
{
try
{
using (e.Graphics)
{
e.DrawBackground();
e.DrawBorder();
e.Graphics.DrawString(strCurrentHintText, HintFont, HintTextColor, HintTextLocation);
}
}
catch
{
}
}
private void rtb1_KeyUp(object sender, KeyEventArgs e)
{
HintFont = new Font("Arial", 9f);
HintTextColor = Brushes.Blue;
HintTextLocation = new Point(10, 10);
if (FindKeyword(rtb1, e.KeyValue, "Sample1") == "Sample1")
{
ShowHint(ttipHint, rtb1, e.KeyValue, "Sample1", "This is an example 1.");
}
else if (FindKeyword(rtb1, e.KeyValue, "Sample2") == "Sample2")
{
ShowHint(ttipHint, rtb1, e.KeyValue, "Sample2", "This is an example 2.\nThis is an example 2. This is an example 2.");
}
else if (FindKeyword(rtb1, e.KeyValue, "Sample3") == "Sample3")
{
ShowHint(ttipHint, rtb1, e.KeyValue, "Sample3", "This is an example 3.\nThis is an example 3. This is an example 3.\nThis is an example 3. This is an example 3. This is an example 3.");
}
else
{
try
{
if (e.KeyValue == 48 || e.KeyValue == 13 || e.KeyValue == 8)
{
ShowHint(ttipHint, rtb1, e.KeyValue, HintTexts.Last().Key, HintTexts.Last().Value);
}
}
catch
{
}
}
}
#endregion
}
}
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