Adapt the size of a form to its title text in C#

Question

Is there a way to adapt the size of a form to the size of its title / caption text?

For example, official C# Message Box forms will adjust to the size of its title text (Note the lorem ipsum):

Other forms will not adjust their size to that of their title text:

Instead, an ellipsis is added at the end to fit the size mentioned in the "Size" property of the designer.

Is there a way to make the form adjust to the size of the title instead of the size we mention? If not, is there a way to get the full length of the text so that we can assign it to the form?

I tried setting the width of the form using

int topTextWidth =  TextRenderer.MeasureText(this.Text, this.Font).Width;
this.Width = topTextWidth;

But this.Font apparently refers to another font size.

Answer 1

For those who wants a full answer, here it is.

The actual line that resizes the form according to the caption text is the following:

this.Width = TextRenderer.MeasureText(this.Text, SystemFonts.CaptionFont).Width + AllButtonsAndPadding;

AllButtonsAndPadding contains the width of all the buttons (minimize, maximize and close), the window borders and the icon. Getting these information takes a bit of coding. Here's a full example of a form that resizes itself, no matter what buttons or icon you put.

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;
using System.Windows.Forms.VisualStyles;

namespace WindowAutoAdapt
{
public partial class Form1 : Form
{
    //A default value in case Application.RenderWithVisualStyles == false
    private int AllButtonsAndPadding = 0;
    private VisualStyleRenderer renderer = null;

    public Form1()
    {
        InitializeComponent();
        this.Text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit."; //A big text in the title
        GetElementsSize();
        ResizeForm();
    }

    //This gets the size of the X and the border of the form
    private void GetElementsSize()
    {
        var g = this.CreateGraphics();

        // Get the size of the close button.
        if (SetRenderer(VisualStyleElement.Window.CloseButton.Normal))
        {
            AllButtonsAndPadding += renderer.GetPartSize(g, ThemeSizeType.True).Width;
        }

        // Get the size of the minimize button.
        if (this.MinimizeBox && SetRenderer(VisualStyleElement.Window.MinButton.Normal))
        {
            AllButtonsAndPadding += renderer.GetPartSize(g, ThemeSizeType.True).Width;
        }

        // Get the size of the maximize button.
        if (this.MaximizeBox && SetRenderer(VisualStyleElement.Window.MaxButton.Normal))
        {
            AllButtonsAndPadding += renderer.GetPartSize(g, ThemeSizeType.True).Width;
        }

        // Get the size of the icon.
        if (this.ShowIcon)
        {
            AllButtonsAndPadding += this.Icon.Width;
        }

        // Get the thickness of the left, bottom, 
        // and right window frame.
        if (SetRenderer(VisualStyleElement.Window.FrameLeft.Active))
        {
            AllButtonsAndPadding += (renderer.GetPartSize(g, ThemeSizeType.True).Width) * 2; //Borders on both side
        }
    }

    //This resizes the form
    private void ResizeForm()
    {
        this.Width = TextRenderer.MeasureText(this.Text, SystemFonts.CaptionFont).Width + AllButtonsAndPadding;
    }

    //This sets the renderer to the element we want
    private bool SetRenderer(VisualStyleElement element)
    {
        bool bReturn = VisualStyleRenderer.IsElementDefined(element);

        if (bReturn && renderer == null)
            renderer = new VisualStyleRenderer(element);
        else
            renderer.SetParameters(element);

        return bReturn;
    }
 }
 }