Check if richtextbox text area is full

Check if richtextbox text area is full

By : Gonix
Date : November 17 2020, 11:52 AM
it helps some times I would like to display a chunk of text in a richtexbox, but limit the length to fit the text area displayed on the GUI. The user then then hit the next button and it erases the text area and continues onwards with more text in the richtextbox. Kind of like custom scroll bars for the text area, but a way to be able to tell if there is space left on the text area, incase the text font gets larger or smaller it will be dynamic? Is there an event listener for when the text area is full? , I found an answer. You can use:
code :
Size textSize = TextRenderer.MeasureText(richTextBox1.Text, richTextBox1.Font);

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Is there a way to specify full justification for a paragraph of text in a RichTextBox?

Is there a way to specify full justification for a paragraph of text in a RichTextBox?

By : krumax
Date : March 29 2020, 07:55 AM
help you fix your problem You can extend the RichTextBox control like this & set the PARAFORMAT2 structure's Paragraph alignment member wAlignment to PFA_JUSTIFY. To use this member, set the PFM_ALIGNMENT flag in the dwMask member.
NB: RichEdit 2.0 Paragraphs are justified. Rich edit controls earlier than RichEdit 3.0 display the text aligned with the left margin.
code :
        PARAFORMAT2 fmt = new PARAFORMAT2();
        fmt.cbSize = Marshal.SizeOf( fmt );
        fmt.dwMask = PFM_ALIGNMENT;
        fmt.wAlignment = ( short )value; /// PFA_JUSTIFY here.

        // Set the alignment.
        SendMessage( new HandleRef( this, Handle ),
                     SCF_SELECTION, ref fmt );
Why when i enter with the mouse into the richTextBox area its loading all the text over again?

Why when i enter with the mouse into the richTextBox area its loading all the text over again?

By : TechGal
Date : March 29 2020, 07:55 AM
it should still fix some issue It was not loading richtextbox again and again on mouse enter. It just scroll on the start position when you enter mouse in it. I have checked this by removing position lines. Try as given below.
code :
static void HighlightPhrase(RichTextBox box, string phrase, Color color)
        string s = box.Text;
        for (int ix = 0; ; )
            int jx = s.IndexOf(phrase, ix, StringComparison.CurrentCultureIgnoreCase);
            if (jx < 0) break;
            box.SelectionStart = jx;
            box.SelectionLength = phrase.Length;
            box.SelectionColor = color;
            ix = jx + 1;
How do I make the entire text visible or increase the visible area while using RichTextBox in WP8 SDK to develop an app?

How do I make the entire text visible or increase the visible area while using RichTextBox in WP8 SDK to develop an app?

By : Denis Edwards
Date : March 29 2020, 07:55 AM
like below fixes the issue Remove the ScrollViewer.
The Default RichTextBox Template already has one.
code :
<RichTextBox VerticalScrollBarVisibility="Auto">
   <!-- ... -->
how to check whether a string can fit into richtextbox visible area

how to check whether a string can fit into richtextbox visible area

By : Sar
Date : March 29 2020, 07:55 AM
Does that help MeasureText and MeasureString functions has overloads that accept textarea width, height and TextFormatFlags(TextBoxControl, WordBreak e.t.c)
You can compare your text size with RichTextBoxControl size
code :
Size stringSize = new Size();
string text = SomeText();
stringSize = TextRenderer.MeasureText(text, richTextBox1.Font, new Size(richTextBox1.Size.Width, richTextBox1.Size.Height), TextFormatFlags.WordBreak);
string r = string.Format("RTB Width : {0}\r\n", richTextBox1.Size.Width);
r += string.Format("RTB Height : {0}\r\n", richTextBox1.Size.Height);
r += string.Format("TEXT Width : {0}\r\n", stringSize.Width);
r += string.Format("TEXT Height : {0}", stringSize.Height);
How to check if text in a RichTextBox is underlined?

How to check if text in a RichTextBox is underlined?

By : jpwilliams
Date : March 29 2020, 07:55 AM
should help you out You first check whether selectedProperty is a TextDecorationCollection and then immediately after you expect it to be a TextDecorations.Underline or TextDecorations.Strikethrough? This makes no sense.
You probably want to cast selectedProperty to a TextDecorationCollection and then iterate through it. Something like this:
code :
TextRange selectionRange = new TextRange(this.richTextBox.Selection.Start, this.richTextBox.Selection.End);
object selectedProperty = selectionRange.GetPropertyValue(TextBlock.TextDecorationsProperty);

TextDecorationCollection textDecorationCollection = selectedProperty as TextDecorationCollection;
if (textDecorationCollection != null)
    foreach (TextDecoration textDecoration in textDecorationCollection)
        if (textDecoration.Location == TextDecorationLocation.Underline)
            // this code is never reached 
            selectedProperty = "Underline";
        else if (textDecoration.Location == TextDecorationLocation.Strikethrough)
            // this code is never reached 
            selectedProperty = "Strikethrough";
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