GDI DrawString Configurator App

I'm trying to Redraw TextBox Text
but my problem is
1- when the text exceeds the textbox width in case single line I'm still getting the first visible strings which fit the width of the textbox I want to continue drawing all the chars as on the textbox

2- for multiline I have on line missing from the top when the word length is bigger than one line in case RTL.

my code works very well with multiline LTR I Want to fix RTL And Single Line if you can help Me I will be thankful .

her is my code

C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Microsoft_TextBox
{
    public partial class Form9 : Form
    {
        private System.Windows.Forms.TextBox textbox1;
        private System.Windows.Forms.Panel panel1;
        private System.Windows.Forms.TextBox textBox2;
        private System.Windows.Forms.RadioButton radioButton5;
        private System.Windows.Forms.RadioButton radioButton4;
        private System.Windows.Forms.RadioButton radioButton3;
        private System.Windows.Forms.RadioButton radioButton2;
        private System.Windows.Forms.RadioButton radioButton1;
        private System.Windows.Forms.TextBox textBox3;
        private System.Windows.Forms.TextBox textBox4;
        private System.Windows.Forms.TextBox textBox5;
        private System.Windows.Forms.TextBox textBox6;
        private System.Windows.Forms.Button button1;
        public Form9()
        {
            InitializeComponent();
        }
        private void panel1_Paint(object sender, PaintEventArgs e)
        {
            using (StringFormat sf = new StringFormat())
            {

                // Get the font and brush for drawing
                Font font = textbox1.Font;

                //Check if text direction is right - to - left
                bool isRTL = textbox1.RightToLeft == RightToLeft.Yes;
                Brush brush = new SolidBrush(textbox1.ForeColor);


                // تحويل PointF إلى Point
                Point startPoint = new Point((int)0, -(int)0);
                Point endPoint = new Point((int)panel1.Width, (int)(panel1.Height));

                // Calculate the number of visible lines
                int visibleLines = panel1.Height / font.Height;

                // Get the starting point for drawing

                // Get the index of the first visible character
                int startIndex = textbox1.GetCharIndexFromPosition(startPoint);

                // Get the index of the last visible character
                int endIndex = textbox1.GetCharIndexFromPosition(endPoint);

                // Declare variables to hold line numbers
                int startLine, endLine;

                int charIndex = textbox1.SelectionStart;
                int lineNumber = textbox1.GetLineFromCharIndex(charIndex);
                textBox2.Text = lineNumber.ToString();
                textBox3.Text = startIndex.ToString();
                textBox4.Text = (textbox1.GetCharIndexFromPosition(new Point(0, panel1.Height / visibleLines / 4))).ToString();
                textBox6.Text = endIndex.ToString();

                int lastVisibleLine = textbox1.GetLineFromCharIndex(endIndex);




                if (isRTL)
                {

                    // Adjust start line based on whether the window reached the top
                    //if (lineNumber >= visibleLines)
                    try
                    {


                        if ((textbox1.GetCharIndexFromPosition(new Point(0, panel1.Height / visibleLines / 4)) - textbox1.Lines[0].Length) <= 0)

                        {
                            startLine = textbox1.GetLineFromCharIndex(startIndex);
                            endLine = textbox1.GetLineFromCharIndex(endIndex);
                            textBox5.Text = "";
                            textBox5.Text = "hello we are here";
                        }

                        else
                        {
                            startLine = textbox1.GetLineFromCharIndex(startIndex) + 1;
                            endLine = textbox1.GetLineFromCharIndex(endIndex);
                            textBox5.Text = "";
                            textBox5.Text = "hello we are not here";
                        }
                    }
                    catch
                    {
                        startLine = textbox1.GetLineFromCharIndex(startIndex);
                        endLine = textbox1.GetLineFromCharIndex(endIndex);
                        textBox5.Text = "";
                    }

                }
                else
                {

                    // Adjust start line based on whether the window reached the top
                    if (textbox1.GetCharIndexFromPosition(new Point(0, panel1.Height / visibleLines / 4)) == 0)
                    {
                        startLine = textbox1.GetLineFromCharIndex(startIndex);
                        endLine = textbox1.GetLineFromCharIndex(endIndex);

                    }
                    //else if (lineNumber< visibleLines )
                    // {

                    //     startLine = lineNumber;
                    //     endLine = textbox1.GetLineFromCharIndex(endIndex);
                    // }
                    else
                    {
                        startLine = textbox1.GetLineFromCharIndex(startIndex) + 1;
                        endLine = textbox1.GetLineFromCharIndex(endIndex);
                    }
                }


                // Draw each visible line onto panel1
                for (int line = startLine; line <= endLine; line++)
                {
                    // Get the start and end index of the current line
                    int lineStartIndex = textbox1.GetFirstCharIndexFromLine(line);
                    int lineEndIndex = textbox1.GetFirstCharIndexFromLine(line + 1);
                    if (lineEndIndex == -1)
                        lineEndIndex = textbox1.Text.Length;

                    // Get the text of the current line
                    string lineText = textbox1.Text.Substring(lineStartIndex, lineEndIndex - lineStartIndex);



                    // Check if the current character is a newline character
                    if (textbox1.Text == "\n" || textbox1.Text == "\r" || textbox1.Text == "\t" || textbox1.Text == "\f")
                    {
                        continue; // Skip drawing for newline characters
                    }



                    if (isRTL)
                    {
                        // Set the format flags to RightToLeft
                        sf.FormatFlags |= StringFormatFlags.DirectionRightToLeft;
                    }
                    else
                    {
                        // Set the format flags to LeftToRight (default behavior)
                        sf.FormatFlags &= ~StringFormatFlags.DirectionRightToLeft; // Clear the RightToLeft flag
                    }

                    // Calculate the width of the line
                    SizeF textSize = e.Graphics.MeasureString(lineText, font);

                    //// Adjust startPoint for RTL text
                    //if (isRTL)
                    //{
                    //    // Calculate the X-coordinate for the right alignment
                    //    startPoint.X = panel1.Width - (int)textSize.Width;
                    //}


                    // Calculate the X coordinate for the alignment
                    float xCoordinate = startPoint.X;
                    switch (textbox1.TextAlign)
                    {
                        case HorizontalAlignment.Center:
                            if (textbox1.RightToLeft == RightToLeft.Yes)
                            {
                                //xCoordinate = (panel1.Width + textSize.Width) / 2;   /// for DrawString
                                xCoordinate = (panel1.Width - textSize.Width) / 2;   /// for TextRenderer.DrawText
                            }
                            else
                            {
                                xCoordinate = (panel1.Width - textSize.Width) / 2;
                            }
                            break;
                        case HorizontalAlignment.Right:
                            if (textbox1.RightToLeft == RightToLeft.Yes)
                            {
                                // xCoordinate = textSize.Width;       /// for DrawString
                                xCoordinate = 0;        /// for TextRenderer.DrawText
                            }
                            else
                            {
                                xCoordinate = panel1.Width - textSize.Width;
                            }
                            break;
                        case HorizontalAlignment.Left:
                            if (textbox1.RightToLeft == RightToLeft.Yes)
                            {
                                //  xCoordinate = panel1.Width;   /// for DrawString
                                xCoordinate = panel1.Width - textSize.Width;    /// for TextRenderer.DrawText
                            }
                            else
                            {
                                // No need to adjust xCoordinate for left alignment

                            }
                            break;
                        default:
                            break;
                    }
                    // Draw the line
                    // e.Graphics.DrawString(lineText, new Font(textbox1.Font.FontFamily, textbox1.Font.Size, textbox1.Font.Style), brush, xCoordinate, startPoint.Y, sf);

                    // Convert StringFormatFlags to TextFormatFlags
                    TextFormatFlags flags = (TextFormatFlags)StringFormatFlags.NoWrap;
                    if (isRTL)
                    {
                        flags |= TextFormatFlags.RightToLeft;
                    }
                    TextRenderer.DrawText(e.Graphics, lineText, font, new Point((int)xCoordinate, startPoint.Y), textbox1.ForeColor, flags /*(TextFormatFlags)StringFormatFlags.DirectionRightToLeft*/);





                    //// Draw the line
                    //e.Graphics.DrawString(lineText, font, brush, startPoint,sf);

                    // Move to the next line
                    startPoint.Y += font.Height;
                }




            }
        }


        private void textbox1_TextChanged(object sender, EventArgs e)
        {
            panel1.Invalidate();

        }
        private void textbox1_KeyDown(object sender, KeyEventArgs e)
        {
            panel1.Invalidate();
        }

        private void radioButton1_CheckedChanged(object sender, EventArgs e)
        {
            textbox1.TextAlign = HorizontalAlignment.Left;
            //radioButton2.Checked = false;
            //radioButton3.Checked = false;
            panel1.Invalidate();
        }

        private void radioButton2_CheckedChanged(object sender, EventArgs e)
        {
            textbox1.TextAlign = HorizontalAlignment.Center;
            //radioButton1.Checked = false;
            //radioButton3.Checked = false;
            panel1.Invalidate();
        }

        private void radioButton3_CheckedChanged(object sender, EventArgs e)
        {
            textbox1.TextAlign = HorizontalAlignment.Right;
            //radioButton1.Checked = false;
            //radioButton2.Checked = false;
            panel1.Invalidate();
        }

        private void radioButton4_CheckedChanged(object sender, EventArgs e)
        {
            textbox1.RightToLeft = RightToLeft.Yes;
            //radioButton5.Checked = false;
            panel1.Invalidate();
        }

        private void radioButton5_CheckedChanged(object sender, EventArgs e)
        {
            textbox1.RightToLeft = RightToLeft.No;
            //radioButton4.Checked = false;
            panel1.Invalidate();

        }

        private void transparentRichTextBox1_TextChanged(object sender, EventArgs e)
        {
            //textbox1.Text = transparentRichTextBox1.Text;
        }



        private void InitializeComponent()
        {
            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form9));
            this.textbox1 = new System.Windows.Forms.TextBox();
            this.panel1 = new System.Windows.Forms.Panel();
            this.textBox2 = new System.Windows.Forms.TextBox();
            this.radioButton5 = new System.Windows.Forms.RadioButton();
            this.radioButton4 = new System.Windows.Forms.RadioButton();
            this.radioButton3 = new System.Windows.Forms.RadioButton();
            this.radioButton2 = new System.Windows.Forms.RadioButton();
            this.radioButton1 = new System.Windows.Forms.RadioButton();
            this.textBox3 = new System.Windows.Forms.TextBox();
            this.textBox4 = new System.Windows.Forms.TextBox();
            this.textBox5 = new System.Windows.Forms.TextBox();
            this.textBox6 = new System.Windows.Forms.TextBox();
            this.button1 = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // textbox1
            // 
            this.textbox1.BorderStyle = System.Windows.Forms.BorderStyle.None;
            this.textbox1.Font = new System.Drawing.Font("Tahoma", 12F, System.Drawing.FontStyle.Underline);
            this.textbox1.ForeColor = System.Drawing.Color.YellowGreen;
            this.textbox1.Location = new System.Drawing.Point(194, 71);
            this.textbox1.Multiline = true;
            this.textbox1.Name = "textbox1";
            this.textbox1.RightToLeft = System.Windows.Forms.RightToLeft.Yes;
            this.textbox1.Size = new System.Drawing.Size(246, 104);
            this.textbox1.TabIndex = 0;
            this.textbox1.Text = "1111111111111111111111222222222222222222222233333333333333333333334444444444444444444444555555555555555555555566666666666666666666667777777777777777777777888888888888888888888899999999999999999999990000000000000000000000";
            this.textbox1.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
            this.textbox1.TextChanged += new System.EventHandler(this.textbox1_TextChanged);
            this.textbox1.KeyDown += new System.Windows.Forms.KeyEventHandler(this.textbox1_KeyDown);
            // 
            // panel1
            // 
            this.panel1.BackColor = System.Drawing.Color.White;
            this.panel1.Location = new System.Drawing.Point(194, 197);
            this.panel1.Name = "panel1";
            this.panel1.Size = new System.Drawing.Size(246, 104);
            this.panel1.TabIndex = 1;
            this.panel1.Paint += new System.Windows.Forms.PaintEventHandler(this.panel1_Paint);
            // 
            // textBox2
            // 
            this.textBox2.Location = new System.Drawing.Point(194, 340);
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new System.Drawing.Size(213, 24);
            this.textBox2.TabIndex = 2;
            // 
            // radioButton5
            // 
            this.radioButton5.AutoSize = true;
            this.radioButton5.Location = new System.Drawing.Point(598, 280);
            this.radioButton5.Name = "radioButton5";
            this.radioButton5.Size = new System.Drawing.Size(141, 21);
            this.radioButton5.TabIndex = 10;
            this.radioButton5.TabStop = true;
            this.radioButton5.Text = "Right To Left Flase";
            this.radioButton5.UseVisualStyleBackColor = true;
            this.radioButton5.CheckedChanged += new System.EventHandler(this.radioButton5_CheckedChanged);
            // 
            // radioButton4
            // 
            this.radioButton4.AutoSize = true;
            this.radioButton4.Location = new System.Drawing.Point(598, 242);
            this.radioButton4.Name = "radioButton4";
            this.radioButton4.Size = new System.Drawing.Size(140, 21);
            this.radioButton4.TabIndex = 9;
            this.radioButton4.TabStop = true;
            this.radioButton4.Text = "Right To Left True";
            this.radioButton4.UseVisualStyleBackColor = true;
            this.radioButton4.CheckedChanged += new System.EventHandler(this.radioButton4_CheckedChanged);
            // 
            // radioButton3
            // 
            this.radioButton3.AutoSize = true;
            this.radioButton3.Location = new System.Drawing.Point(598, 204);
            this.radioButton3.Name = "radioButton3";
            this.radioButton3.Size = new System.Drawing.Size(61, 21);
            this.radioButton3.TabIndex = 8;
            this.radioButton3.TabStop = true;
            this.radioButton3.Text = "Right";
            this.radioButton3.UseVisualStyleBackColor = true;
            this.radioButton3.CheckedChanged += new System.EventHandler(this.radioButton3_CheckedChanged);
            // 
            // radioButton2
            // 
            this.radioButton2.AutoSize = true;
            this.radioButton2.Location = new System.Drawing.Point(598, 166);
            this.radioButton2.Name = "radioButton2";
            this.radioButton2.Size = new System.Drawing.Size(70, 21);
            this.radioButton2.TabIndex = 7;
            this.radioButton2.TabStop = true;
            this.radioButton2.Text = "Center";
            this.radioButton2.UseVisualStyleBackColor = true;
            this.radioButton2.CheckedChanged += new System.EventHandler(this.radioButton2_CheckedChanged);
            // 
            // radioButton1
            // 
            this.radioButton1.AutoSize = true;
            this.radioButton1.Location = new System.Drawing.Point(598, 128);
            this.radioButton1.Name = "radioButton1";
            this.radioButton1.Size = new System.Drawing.Size(52, 21);
            this.radioButton1.TabIndex = 6;
            this.radioButton1.TabStop = true;
            this.radioButton1.Text = "Left";
            this.radioButton1.UseVisualStyleBackColor = true;
            this.radioButton1.CheckedChanged += new System.EventHandler(this.radioButton1_CheckedChanged);
            // 
            // textBox3
            // 
            this.textBox3.Location = new System.Drawing.Point(194, 370);
            this.textBox3.Name = "textBox3";
            this.textBox3.Size = new System.Drawing.Size(213, 24);
            this.textBox3.TabIndex = 12;
            // 
            // textBox4
            // 
            this.textBox4.Location = new System.Drawing.Point(194, 400);
            this.textBox4.Name = "textBox4";
            this.textBox4.Size = new System.Drawing.Size(213, 24);
            this.textBox4.TabIndex = 13;
            // 
            // textBox5
            // 
            this.textBox5.Font = new System.Drawing.Font("Tahoma", 12F);
            this.textBox5.ForeColor = System.Drawing.Color.YellowGreen;
            this.textBox5.Location = new System.Drawing.Point(580, 333);
            this.textBox5.Multiline = true;
            this.textBox5.Name = "textBox5";
            this.textBox5.RightToLeft = System.Windows.Forms.RightToLeft.Yes;
            this.textBox5.Size = new System.Drawing.Size(326, 105);
            this.textBox5.TabIndex = 14;
            //this.textBox5.Text = resources.GetString("textBox5.Text");
            this.textBox5.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
            // 
            // textBox6
            // 
            this.textBox6.Location = new System.Drawing.Point(413, 370);
            this.textBox6.Name = "textBox6";
            this.textBox6.Size = new System.Drawing.Size(100, 24);
            this.textBox6.TabIndex = 15;
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(102, 351);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 16;
            this.button1.Text = "button1";
            this.button1.UseVisualStyleBackColor = true;
            // 
            // Form9
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(7F, 16F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            //this.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("$this.BackgroundImage")));
            this.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Stretch;
            this.ClientSize = new System.Drawing.Size(800, 477);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.textBox6);
            this.Controls.Add(this.textBox5);
            this.Controls.Add(this.textBox4);
            this.Controls.Add(this.textBox3);
            this.Controls.Add(this.radioButton5);
            this.Controls.Add(this.radioButton4);
            this.Controls.Add(this.radioButton3);
            this.Controls.Add(this.radioButton2);
            this.Controls.Add(this.radioButton1);
            this.Controls.Add(this.textBox2);
            this.Controls.Add(this.panel1);
            this.Controls.Add(this.textbox1);
            this.Name = "Form9";
            this.Text = "Form9";
            this.ResumeLayout(false);
            this.PerformLayout();

        }
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

    }
}

Thanks, nice work. Here is code to to bypass ranges count limitation (translated from vb.net)

private void InternalDrawCharactedRanges(Graphics g, Rectangle rect)
{
    // Dim charRanges As CharacterRange()
    // If Me.CanvasText.Length > 32 Then
    // ' more than 32 ranges not allowed for SetMeasurableCharacterRanges
    // charRanges = New CharacterRange() {New CharacterRange(0, Me.Text.Length)}
    // Else
    // charRanges = New CharacterRange(Me.CanvasText.Length - 1) {}
    // For i As Integer = 0 To Me.Text.Length - 1
    // charRanges(i) = New CharacterRange(i, 1)
    // Next
    // End If

  
    List<CharacterRange[]> charRangeArrList = new List<CharacterRange[]>();
    List<CharacterRange> rngList = new List<CharacterRange>();
    int count = 0;
    for (int i = 0; i <= this.Text.Length - 1; i++)
    {
        if (i - count < 32)
            rngList.Add(new CharacterRange(i, 1));
        else
        {
            charRangeArrList.Add(rngList.ToArray());
            rngList = new List<CharacterRange>();
            i -= 1;
            count = i;
        }
    }
    if (rngList.Count > 0)
        charRangeArrList.Add(rngList.ToArray());

    // ---
    for (int i = 0; i <= charRangeArrList.Count - 1; i++)
    {
        CharacterRange[] charRanges = charRangeArrList[i];
        StringFormat xStringFormat = this.GetStringFormat;
        xStringFormat.SetMeasurableCharacterRanges(charRanges);
        System.Drawing.Region[] ranges = g.MeasureCharacterRanges(this.Text, this.Font, rect, xStringFormat);
        foreach (System.Drawing.Region region in ranges)
        {
            RectangleF charRect = region.GetBounds(g);
            g.DrawRectangle(Pens.Green, charRect.X, charRect.Y, charRect.Width, charRect.Height);
        }
    }
}

modified 4-Mar-19 16:12pm.

Thanks!That's helpful! Poke tongue | ;-P

great tool!

I kept struggling with MesureCharacterRanges in some own code for a few days. Your tool helped me a lot to get it work.

But I get sufficiant results, if - and only if - I draw the text by calling the Graphics.DrawString method by myself (I'am using it with DataGridView CellPainting)
The output is different to the one the e.PaintContent / e.PaintParts methods produces.

Do you know if there is some way to get *all* relevant settings, the build-in (basic) "drawString"-method uses? I want the Text painted out by Graphics.DrawString to look exactly like the output you get by default. And it does not.

I think it's in the settings for antiAlias, FontContrast, ... - trying out will be a bad way, because there's no guarantee that the mesuring will work with other systems (computer/os)

This topic is very interesting.
But, the solution downloaded is 'incompatible' with VS 2010.
It's possible to open the solution in VS 2010 ?

Many Thanks

Thank you for sharing. Smile | :)

GDI DrawString Configurator App

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