richTextBox1 contains text
I click on a word and Console displays that word for me and it highlights/selects the word i clicked on.
To do this, I keep the index of the character I clicked on then go left and right until I hit a space, -1, or end of file. Now I have the indexes of the beginning and end of the word. The last two lines are supposed to select the word between those two indexes.
However, what happens is that sometimes it highlights the word I want and sometimes it highlights all the words to the right of the character I clicked on.
"omar hello where are you going"
If I click on h in hello, it highlights hello where instead of highlighting hello
If I click on o in going, it will highlight going only as it should
If I click on o in you, it will highlight you going
I used console to check the start and end indexes of the word and they're always right yet for some reason, other words are selected in addition to the word i clicked on
private void richTextBox1_Click(object sender, EventArgs e)
{
int length = richTextBox1.Text.Length;
int rightPart = richTextBox1.SelectionStart;
int leftPart = richTextBox1.SelectionStart - 1;
string rightText = "";
string leftText = "";
while (rightPart != length)
{
if (richTextBox1.Text[rightPart].ToString().CompareTo(" ") != 0)
{
rightText += richTextBox1.Text[rightPart];
rightPart++;
}
else
{
break;
}
}
while (leftPart != -1)
{
if (richTextBox1.Text[leftPart].ToString().CompareTo(" ") != 0)
{
leftText = richTextBox1.Text[leftPart] + leftText;
leftPart--;
}
else
{
break;
}
}
leftPart++;
Console.WriteLine("\nSelected word is " + leftText + rightText + "\n");
richTextBox1.SelectionStart = leftPart;
richTextBox1.SelectionLength = rightPart;
}
The problem appears to be that you are setting the SelectionLength equal to rightPart. Remember this property represents the length of the selection, not the last index of the selection.
Instead, try changing your code to calculate the length by getting the difference between leftPart and rightPart:
richTextBox1.SelectionLength = rightPart - leftPart;
For what it's worth, your code can be shortened a little:
private void richTextBox1_Click(object sender, EventArgs e)
{
if (richTextBox1.TextLength == 0) return;
int rightPart = richTextBox1.SelectionStart;
int leftPart = richTextBox1.SelectionStart - 1;
while (rightPart < richTextBox1.TextLength && richTextBox1.Text[rightPart] != ' ')
{
rightPart++;
}
while (leftPart > -1 && richTextBox1.Text[leftPart] != ' ')
{
leftPart--;
}
leftPart++;
Console.WriteLine($"\nSelected word is " +
richTextBox1.Text.Substring(leftPart, rightPart - leftPart) + "\n");
richTextBox1.SelectionStart = leftPart;
richTextBox1.SelectionLength = rightPart - leftPart;
}
Or even a little more, using IndexOf and LastIndexOf instead of loops to find the spaces:
private void richTextBox1_Click(object sender, EventArgs e)
{
if (richTextBox1.TextLength == 0) return;
// Find the space before this word and after this word
var selStart = Math.Min(richTextBox1.SelectionStart, richTextBox1.TextLength - 1);
var firstSpace = richTextBox1.Text.LastIndexOf(' ', selStart);
var lastSpace = richTextBox1.Text.IndexOf(' ', selStart);
var start = firstSpace + 1;
var length = (lastSpace < 0 ? richTextBox1.TextLength : lastSpace) - start;
Console.WriteLine($"\nSelected word is {richTextBox1.Text.Substring(start, length)} \n");
richTextBox1.SelectionStart = start;
richTextBox1.SelectionLength = length;
}
Related
In my RichtextBox, if I have written as below.
This is my pen,
his pen is beautiful.
Now I search word "is" then
output would be as below.
All "is" should be highlighted.
What about:
static class Utility {
public static void HighlightText(this RichTextBox myRtb, string word, Color color) {
if (word == string.Empty)
return;
int s_start = myRtb.SelectionStart, startIndex = 0, index;
while((index = myRtb.Text.IndexOf(word, startIndex)) != -1) {
myRtb.Select(index, word.Length);
myRtb.SelectionColor = color;
startIndex = index + word.Length;
}
myRtb.SelectionStart = s_start;
myRtb.SelectionLength = 0;
myRtb.SelectionColor = Color.Black;
}
}
Looks like this would do it.
http://www.dotnetcurry.com/ShowArticle.aspx?ID=146
int start = 0;
int indexOfSearchText = 0;
private void btnFind_Click(object sender, EventArgs e)
{
int startindex = 0;
if(txtSearch.Text.Length > 0)
startindex = FindMyText(txtSearch.Text.Trim(), start, rtb.Text.Length);
// If string was found in the RichTextBox, highlight it
if (startindex >= 0)
{
// Set the highlight color as red
rtb.SelectionColor = Color.Red;
// Find the end index. End Index = number of characters in textbox
int endindex = txtSearch.Text.Length;
// Highlight the search string
rtb.Select(startindex, endindex);
// mark the start position after the position of
// last search string
start = startindex + endindex;
}
}
public int FindMyText(string txtToSearch, int searchStart, int searchEnd)
{
// Unselect the previously searched string
if (searchStart > 0 && searchEnd > 0 && indexOfSearchText >= 0)
{
rtb.Undo();
}
// Set the return value to -1 by default.
int retVal = -1;
// A valid starting index should be specified.
// if indexOfSearchText = -1, the end of search
if (searchStart >= 0 && indexOfSearchText >=0)
{
// A valid ending index
if (searchEnd > searchStart || searchEnd == -1)
{
// Find the position of search string in RichTextBox
indexOfSearchText = rtb.Find(txtToSearch, searchStart, searchEnd, RichTextBoxFinds.None);
// Determine whether the text was found in richTextBox1.
if (indexOfSearchText != -1)
{
// Return the index to the specified search text.
retVal = indexOfSearchText;
}
}
}
return retVal;
}
// Reset the richtextbox when user changes the search string
private void textBox1_TextChanged(object sender, EventArgs e)
{
start = 0;
indexOfSearchText = 0;
}
This will show all the searched criteria at the same time.
Using: 1 Textbox (to enter the text to search for) and 1 Button (to Run the Search).
Enter your search criteria inside the textbox and press search button.
// On Search Button Click: RichTextBox ("rtb") will display all the words inside the document
private void btn_Search_Click(object sender, EventArgs e)
{
try
{
if (rtb.Text != string.Empty)
{// if the ritchtextbox is not empty; highlight the search criteria
int index = 0;
String temp = rtb.Text;
rtb.Text = "";
rtb.Text = temp;
while (index < rtb.Text.LastIndexOf(txt_Search.Text))
{
rtb.Find(txt_Search.Text, index, rtb.TextLength, RichTextBoxFinds.None);
rtb.SelectionBackColor = Color.Yellow;
index = rtb.Text.IndexOf(txt_Search.Text, index) + 1;
rtb.Select();
}
}
}
catch (Exception ex) { MessageBox.Show(ex.Message, "Error"); }
}
}
}
If you only want to match the whole word you can use this, note that this ignores case and also the |s\b means that plurals get highlighted e.g. Cat matches cats but not caterpiller :
public static void HighlightText(RichTextBox myRtb, string word, Color color)
{
if (word == string.Empty)
return;
var reg = new Regex(#"\b" + word + #"(\b|s\b)",RegexOptions.IgnoreCase);
foreach (Match match in reg.Matches(myRtb.Text))
{
myRtb.Select(match.Index, match.Length);
myRtb.SelectionColor = color;
}
myRtb.SelectionLength = 0;
myRtb.SelectionColor = Color.Black;
}
private void button3_Click(object sender, EventArgs e)
{
if (textBox1.Text != "")
{
for (int i = 0; i < richTextBox1.TextLength; i++)
{
richTextBox1.Find(textBox1.Text, i, RichTextBoxFinds.None);
richTextBox1.SelectionBackColor = Color.Red;
}
}
else
{
for (int i = 0; i < richTextBox1.TextLength; i++)
{
richTextBox1.SelectAll();
richTextBox1.SelectionBackColor = Color.White;
}
}
}[lets make it!][1]
I would do it like that because all the other answers highlight the text, but doesnt change it back after you searched again.
Use the RichText Find Method to find the starting index for the searching word.
public int FindMyText(string searchText, int searchStart, int searchEnd)
{
int returnValue = -1;
if (searchText.Length > 0 && searchStart >= 0)
{
if (searchEnd > searchStart || searchEnd == -1)
{
int indexToText = richTextBox1.Find(searchText, searchStart, searchEnd, RichTextBoxFinds.MatchCase);
if (indexToText >= 0)
{
returnValue = indexToText;
}
}
}
return returnValue;
}
Use a Button or TextChangeListener and Search for your word.
private void button1_Click(object sender, EventArgs e)
{
// Select the first char in your Richtextbox
richTextBox1.SelectionStart = 0;
richTextBox1.SelectionLength = richTextBox1.TextLength;
// Select until the end
richTextBox1.SelectionColor = Color.Black;
// Make the Text Color black
//Use an Inputfield to add the searching word
var word = txtSearch.Text;
//verify the minimum length otherwise it may freeze if you dont have text inside
if (word.Length > 3)
{
int s_start = richTextBox1.SelectionStart, startIndex = 0, index;
while ((index = FindMyText(word, startIndex, richTextBox1.TextLength)) != -1)
{
// goes through all possible found words and color them blue (starting index to end)
richTextBox1.Select(index, word.Length);
richTextBox1.SelectionColor = Color.Blue;
startIndex = index + word.Length;
}
// Color everything between in color black to highlight only found words
richTextBox1.SelectionStart = startIndex;
richTextBox1.SelectionLength = 0;
richTextBox1.SelectionColor = Color.Black;
}
}
I would highly recommend to set a minimum word length to avoid freezing and high memory allocation.
text box area that automatically cuts a long paragraph text into 30 characters sentences
i am trying run this code but occurs exception [exception of type 'System.StackOverflowException']
private void txtCutParagraph_TextChanged(object sender, EventArgs e)
{
int limitNum = 30;
string sentence = txtCutParagraph.Text;
string[] words = sentence.Split(' ');
string line = "";
foreach (string word in words)
{
if ((line + word).Length > limitNum)
{
newLine += line + "\r\n";
line = "";
}
line += word + " ";
}
if (line.Length > 0)
newLine += line + "\r\n";
txtCutParagraph.Text = newLine;
}
If the form is freezing is because that txtCutParagraph_TextChanged event is firing infinitely, because you are changing the text of textbox at the end of the event: txtCutParagraph.Text = newLine;, so it means that change text in the textbox, and the event will fire again and again.
To prevent this form from freezing please move your code to another event of textbox, named KeyPress as:
private void txtCutParagraph_KeyPress(object sender, KeyPressEventArgs e)
{
int limitNum = 30;
string sentence = txtCutParagraph.Text;
string[] words = sentence.Split(' ');
string line = "";
foreach (string word in words)
{
if ((line + word).Length > limitNum)
{
newLine += line + "\r\n";
line = "";
}
line += word + " ";
}
if (line.Length > 0)
newLine += line + "\r\n";
txtCutParagraph.Text = newLine;
}
What you are trying to do is called Word wrapping. TextBox class has Wordwrap option by default. unfortunately you cant limit number of characters per line.
You have to write an algorithm instead. I have noticed that your algorithm does not work correctly. so i decided to write one my self (as it was a good practice!). It is hard to handle all situations that can happen inside text formatting. I tried my best anyway you have to write one your self if you are not satisfied with results.
Before using this algorithm you have to disable Wordwrap feature of Textbox. So they will not Interfere each other. In InitializeComponent inside Form Designer add this line.
this.textBox1.WordWrap = false;
Now use this algorithm to do it for you! Note that textbox1 is a multi line text box.
private StringBuilder stringBuilder = new StringBuilder();
private bool _isInsideTextChanged = false;
private const int MaximumChars = 30; // Maximum characters
private StringBuilder WrapText(StringBuilder text, ref int position)
{
StringBuilder newStringBuilder = new StringBuilder(text.ToString());
int charsPerLine = 0;
int lastSpace = -1; // index of last space per line
for (int i = 0; i < newStringBuilder.Length; i++)
{
if (newStringBuilder[i] == ' ')
{
if (newStringBuilder.Length > i + 2 && newStringBuilder.ToString(i + 1, 2) == "\r\n")
{
if (newStringBuilder.Length > i + 3)
{
int next = newStringBuilder.ToString().IndexOf(' ', i + 3);
if (next != -1 && charsPerLine + next - i <= MaximumChars || charsPerLine + newStringBuilder.Length - i - 2 <= MaximumChars)
{
newStringBuilder.Remove(i + 1, 2);
if (i <= textBox1.SelectionStart)
{
position -= 2;
}
continue;
}
}
i++;
continue;
}
if (newStringBuilder.Length > i + 1 && newStringBuilder[i + 1] != ' ')
{
lastSpace = i;
}
}
if (newStringBuilder[i] == '\n' || newStringBuilder[i] == '\r')
{
lastSpace = -1;
charsPerLine = 0;
}
if (++charsPerLine > MaximumChars && lastSpace != -1)
{
newStringBuilder.Insert(lastSpace + 1, "\r\n");
if (lastSpace <= textBox1.SelectionStart)
{
position += 2;
}
charsPerLine = i - lastSpace;
lastSpace = -1;
i++;
}
}
return newStringBuilder;
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
if (_isInsideTextChanged) return;
_isInsideTextChanged = true;
stringBuilder.Clear();
stringBuilder.Append(textBox1.Text);
int position = textBox1.SelectionStart;
string newText = WrapText(stringBuilder, ref position).ToString();
textBox1.Text = newText;
textBox1.SelectionStart = position;
_isInsideTextChanged = false;
}
Here is the test that shows the results.
How this wroks?
This algorithm will count the number of characters from last line break index (default value is 0) up to last space character index per line.(default value is -1 means no space in that line). Then it will put line break after last space if the number of characters on that line is more than 30. How ever this algorithm test other things too to better handle text formatting.
This is done every time a textbox value is changed. StringBuilder is used instead of string to increase performance.
To prevent stack overflow exception as described by #KhaksarWeqar I used a boolean value _isInsideTextChanged with TextChanged event:
private bool _isInsideTextChanged = false;
private void textBox1_TextChanged(object sender, EventArgs e)
{
if (_isInsideTextChanged) return; // return if was inside TextChanged.
_isInsideTextChanged = true; // inside TextChanged
// Do stuff...
_isInsideTextChanged = false; // outside TextChanged
}
There is also a better way explained on wiki. you can create your own even better!. https://en.wikipedia.org/wiki/Line_wrap_and_word_wrap
I am trying to highlight words in richtextbox. When user mouse over the word in richtextbox the word should be highlighted.
Below is the code I am so far. Errors: last highlight point is good but start point is not accurate, When i place a new paragrah or new line then start point goes so away then expected result.
private void richTextBox1_MouseMove(object sender, MouseEventArgs e)
{
richTextBox1.Focus();
selectWordOnMouseOver();
}
public void selectWordOnMouseOver()
{
if (richTextBox1 == null)
return;
TextPointer cursurPosition = richTextBox1.GetPositionFromPoint(Mouse.GetPosition(richTextBox1), false);
if (cursurPosition == null)
return;
int offset = richTextBox1.Document.ContentStart.GetOffsetToPosition(cursurPosition);
// offset = offset;
//MessageBox.Show("Offset = " + offset.ToString());
int spaceAfter = FindSpaceAfterWordFromPosition(cursurPosition, " ");
int spaceBefore = FindSpaceBeforeWordFromPosition(cursurPosition, " ");
TextPointer wholeText = richTextBox1.Document.ContentStart;
TextPointer start = wholeText.GetPositionAtOffset(spaceBefore);
TextPointer end = wholeText.GetPositionAtOffset(spaceAfter);
if (start == null || end == null )
return;
richTextBox1.Selection.ApplyPropertyValue(TextElement.ForegroundProperty, Brushes.Black);
richTextBox1.Selection.Select(start, end);
// MessageBox.Show("Mouse Over On = " + offset.ToString() + ": Word Start = " + (spaceBefore).ToString() + ": Word End = " + (spaceAfter).ToString() + " : Word is = " + richTextBox1.Selection.Text);
}
int FindSpaceBeforeWordFromPosition(TextPointer position, string word)
{
while (position != null)
{
if (position.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.Text)
{
string textRun = position.GetTextInRun(LogicalDirection.Backward);
// Find the starting index of any substring that matches "word".
int spaceIndexBeforeMouseOver = textRun.LastIndexOf(word);
return spaceIndexBeforeMouseOver;
}
position = position.GetNextContextPosition(LogicalDirection.Backward);
}
// position will be null if "word" is not found.
return 0;
}
int FindSpaceAfterWordFromPosition(TextPointer position, string word)
{
while (position != null)
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
string textRun = position.GetTextInRun(LogicalDirection.Forward);
// Find the starting index of any substring that matches "word".
int spaceIndexAfterMouseOver = textRun.IndexOf(word);
int lastIndexAfterMouseOverIndex = textRun.Count();
int mouseOverIndex = richTextBox1.Document.ContentStart.GetOffsetToPosition(position);
if (spaceIndexAfterMouseOver >= 0)
{
return spaceIndexAfterMouseOver + mouseOverIndex;
}
else//if space index not found the select to to the last word of text box
return mouseOverIndex + lastIndexAfterMouseOverIndex;
}
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
// position will be null if "word" is not found.
return 0;
}
results when no new line.
results when there are 3 new line feeds.
UPDATE 1:
I recently after testing found one thing that I am getting wrong offset.
Point nMousePositionCoordinate = Mouse.GetPosition(richTextBox1);
// System.Diagnostics.Debug.WriteLine(nMousePositionCoordinate.ToString());
TextPointer cursurPosition = richTextBox1.GetPositionFromPoint(nMousePositionCoordinate, false);
if (cursurPosition == null)
return;
int offset = richTextBox1.Document.ContentStart.GetOffsetToPosition(cursurPosition);
System.Diagnostics.Debug.WriteLine(offset.ToString());
I am trying to create some sort of license verification text box that automatically splits the user inputs into chunks separated by hyphens. My license is 25 characters long and it separated as such:
XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
I have come up with the following code to parse the user input while he is typing or through copy/paste by handling the TextChanged event of the Textbox Control like so:
public static string InsertStringAtInterval(string source, string insert, int interval)
{
StringBuilder result = new StringBuilder();
int currentPosition = 0;
while (currentPosition + interval < source.Length)
{
result.Append(source.Substring(currentPosition, interval)).Append(insert);
currentPosition += interval;
}
if (currentPosition < source.Length)
{
result.Append(source.Substring(currentPosition));
}
return result.ToString();
}
private bool bHandlingChangeEvent = false;
private void txtLicense_TextChanged(object sender, EventArgs e)
{
if (bHandlingChangeEvent == true)
return;
bHandlingChangeEvent = true;
string text = txtLicense.Text.Replace("-", "").Replace(" ","");
int nPos = txtLicense.SelectionStart;
if((text.Length==5||text.Length==10||text.Length==15||text.Length==20) && txtLicense.Text[txtLicense.Text.Length-1]!='-')
{
txtLicense.Text += "-";
txtLicense.SelectionStart = nPos + 1;
}
if(text.Length>=25)
{
string tmp = text.Substring(0, 25);
tmp = InsertStringAtInterval(tmp, "-", 5);
txtLicense.Text = tmp;
txtLicense.SelectionStart = nPos;
}
bHandlingChangeEvent = false;
}
While this is working perfectly when I user types and pastes inside the box. My only problem is that when the user tries to delete characters from the entered key by either pressing backspace or delete.
Due to the forced hyphen insertion # positions 5,10,15,20 once a user reaches one of these marks on a backspace press the logic above forces the hyphen addition to the string and the user cannot go beyond that.
I tried fiddling with KeyDown events but couldn't come up with anything useful. can someone help please.
I also tried using a MaskedTextbox but that thing is ugly as I don't want the mask/hyphens to be visible on focus and I certainly don't want to replace the prompt with white spaces as it will give some confusion when clicking inside the box as the cursor will not always position at the beginning of the box when its "supposedly" empty.
This sort of thing has been the cause of a lot of suffering for me over the years. The way I approach it is to treat each change to the text as if it were pasted from scratch - I strip out the hyphens, then put them back in in the appropriate position. Then you can just handle the special case where the user has deleted the last character. In this case, you compare the text from just before the TextChanged event to the text afterward. If they are the same, but the previous text is one character longer, just don't do anything special.
Here is some code that seems to work for text entry, cut/copy/paste, etc. It could be improved with a little fancy LINQ, some error handling, etc. but hopefully it gets the idea across.
private string previousText = string.Empty;
private bool processing = false;
private void textBox1_TextChanged(object sender, EventArgs e)
{
// If we're already messing around with the text, don't start again.
if (processing)
return;
processing = true;
// The current textbox text
string newText = textBox1.Text;
// What was there before, minus one character.
string previousLessOne = previousText == string.Empty ? string.Empty : previousText.Substring(0, previousText.Length - 1);
// Get where the user is, minus any preceding dashes
int caret = textBox1.SelectionStart - (textBox1.Text.Substring(0, textBox1.SelectionStart).Count(ch => ch == '-'));
// If the user has done anything other than delete the last character, ensure dashes are placed in the correct position.
if (newText.Length > 0 && newText != previousLessOne)
{
textBox1.Text = string.Empty;
newText = newText.Replace("-", "");
for (int i = 0; i < newText.Length; i += 5)
{
int length = Math.Min(newText.Length - i, 5);
textBox1.Text += newText.Substring(i, length);
if (length == 5)
textBox1.Text += '-';
}
}
// Put the user back where they were, adjusting for dashes.
textBox1.SelectionStart = caret + (caret / 5);
previousText = textBox1.Text;
processing = false;
}
You can try this version:
void txtLicense_KeyDown(object sender, KeyEventArgs e) {
if (e.KeyCode == Keys.Back) {
int index = txtLicense.SelectionStart;
while (index > 0 && txtLicense.Text[index - 1] == '-') {
--index;
}
if (index > 0) {
--index;
}
txtLicense.Select(index, txtLicense.SelectionLength + Math.Max(index, 1));
txtLicense.SelectedText = string.Empty;
e.SuppressKeyPress = true;
}
}
I've done something similar to this before. What I would do is not add a hyphen until there is a character after its insertion point. For example, instead of adding a hyphen after 5 chars have been entered, do it at 6 so that it is never added at the end.
Here is the algorithm I use to insert hyphens at specific places:
public static string FormatLicenseNumber(string str)
{
if (string.IsNullOrEmpty(str))
return str;
else
{
str = str.Replace("-", string.Empty);
if (str.Length > 20)
str = str.Insert(20, "-");
if (str.Length > 15)
str = str.Insert(15, "-");
if (str.Length > 10)
str = str.Insert(10, "-");
if (str.Length > 5)
str = str.Insert(5, "-");
return str;
}
}
I'm trying to add numbered list functionality to a text editor. RichTextbox already provides the SelectionBullet property to change a selection to a bulleted list. But i was unable to find a similar property to generate numbered list. Is there any standard way to create a numbered list on Richtextbox. If not, i would have to implement it myself so code snips that could help me do that will help, Thank you.
I know that a link is not gernerally accepted as a good answer, however the article RichTextBox with Search Line Numbering, Bulleting, Printing, Searching Support on CodeProject could probably help you out quite a bit with what you are looking for.
In this article, the author extends the RichTextBox control into something that can do what you are asking (and more), plus the code is posted there for all to see.
Well, i implemented it as follows.
private void btnNumbers_Click(object sender, EventArgs e)
{
string temptext = rtbMain.SelectedText;
int SelectionStart = rtbMain.SelectionStart;
int SelectionLength = rtbMain.SelectionLength;
rtbMain.SelectionStart = rtbMain.GetFirstCharIndexOfCurrentLine();
rtbMain.SelectionLength = 0;
rtbMain.SelectedText = "1. ";
int j = 2;
for( int i = SelectionStart; i < SelectionStart + SelectionLength; i++)
if (rtbMain.Text[i] == '\n')
{
rtbMain.SelectionStart = i + 1;
rtbMain.SelectionLength = 0;
rtbMain.SelectedText = j.ToString() + ". ";
j++;
SelectionLength += 3;
}
}
private void rtbMain_KeyDown(object sender, KeyEventArgs e)
{//this piece of code automatically increments the bulleted list when user //presses Enter key
int tempNum;
if (e.KeyCode == Keys.Enter)
try
{
if (char.IsDigit(rtbMain.Text[rtbMain.GetFirstCharIndexOfCurrentLine()]))
{
if (char.IsDigit(rtbMain.Text[rtbMain.GetFirstCharIndexOfCurrentLine() + 1]) && rtbMain.Text[rtbMain.GetFirstCharIndexOfCurrentLine() + 2] == '.')
tempNum = int.Parse(rtbMain.Text.Substring(rtbMain.GetFirstCharIndexOfCurrentLine(),2));
else tempNum = int.Parse(rtbMain.Text[rtbMain.GetFirstCharIndexOfCurrentLine()].ToString());
if (rtbMain.Text[rtbMain.GetFirstCharIndexOfCurrentLine() + 1] == '.' || (char.IsDigit(rtbMain.Text[rtbMain.GetFirstCharIndexOfCurrentLine() + 1]) && rtbMain.Text[rtbMain.GetFirstCharIndexOfCurrentLine() + 2] == '.'))
{
tempNum++;
rtbMain.SelectedText = "\r\n" + tempNum.ToString() + ". ";
e.SuppressKeyPress = true;
}
}
}
catch{}
}
Here is my answer... which is easily readable and refineable. I took a much different approach but added the ability to remove the numbered list within the selection if it already exists. Please note that so far I have only lightly tested it and it seems to work good... but it may need further refinement.
private void btnOrdered_Click(object sender, EventArgs e)
{
string[] splitSelection = null;
// If selection split selection else split everything
if (this.txtCaptionEditor.SelectionLength > 0)
{
splitSelection = this.txtCaptionEditor.SelectedText.Replace("\r\n", "\n").Split("\n".ToCharArray());
}
else
{
splitSelection = this.txtCaptionEditor.Text.Replace("\r\n", "\n").Split("\n".ToCharArray());
}
bool Exists = false;
for (int i = 0; i < splitSelection.GetLength(0); i++)
{
// If Ordered List Allready exists in selection then remove else add
if (!string.IsNullOrEmpty(splitSelection[i]))
{
if (splitSelection[i].Substring(0, 2) == "1.") { Exists = true; }
}
}
for (int i = 0; i < splitSelection.GetLength(0); i++)
{
int lineCount = (i + 1);
if (Exists)
{
this.txtCaptionEditor.Text = this.txtCaptionEditor.Text.Replace(Convert.ToString(lineCount) + ". ", "");
}
else
{
if(!string.IsNullOrEmpty(splitSelection[i]))
{
this.txtCaptionEditor.Text = this.txtCaptionEditor.Text.Replace(splitSelection[i], Convert.ToString(lineCount) + ". " + splitSelection[i]);
}
}
}
}
private void txtCaptionEditor_KeyDown(object sender, KeyEventArgs e)
{
string[] splitSelection = this.txtCaptionEditor.Text.Replace("\r\n", "\n").Split("\n".ToCharArray());
if (e.KeyCode == Keys.Enter)
{
// Get Current Line Position
int currentLine = this.txtCaptionEditor.GetLineFromCharIndex(this.txtCaptionEditor.SelectionStart);
// Only Run if the previous line is greater than zero
if ((currentLine) >= 0)
{
// Loop through 100 possible numbers for match you can go higher
// If you think your numbered list could go above 100
for (int i = 0; i < 100; i++)
{
if (splitSelection[(currentLine)].Substring(0, 2) == Convert.ToString((i + 1)) + ".")
{
// If the substring of the current line equals a numbered list value.. enumerate next line
this.txtCaptionEditor.SelectedText = "\n" + (i + 2) + ". ";
e.SuppressKeyPress = true;
}
}
}
}
}