RadLabel.MaximumSize on High DPI

3 posts, 1 answers
  1. Jeremy
    Jeremy avatar
    13 posts
    Member since:
    Dec 2013

    Posted 11 Dec 2018 Link to this post

    I try to display long description text with nice word wrapping using RadLabel
    To do that I set AutoSize=true but control Width of RadLabel setting MaximumSize.
    I set the maximum size and recalculate it every time Form's size changes.

    Everything works fine until you change the DPI settings in the system. 
    When you do this and change MaximumSize property at runtime my value will be multiplied by the scaling value.
    And since I use form size (which is already scaled) I got doubled scale.
    For example if I set scaling 150% my value be multiplied by 1.5.

    Below I gave examples of my code and screenshots from different DPI. 

    100% https://clip2net.com/s/3YxZaSZ
    150% https://clip2net.com/s/3YxZom6
    200% https://clip2net.com/s/3YxZees

    I use Telerik 2018.3.1016.20 with .Net 3.5 
    I very much rely on your help and advice.

    using System;
    using System.Drawing;
    using Telerik.WinControls.UI;
    namespace DesignExamples.BugsForTelerik
        public class Form1 : RadForm
            private RadLabel radLabel1;
            private RadLabel radLabel2;
            public Form1()
            private void InitializeComponent()
                System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1));
                this.radLabel1 = new Telerik.WinControls.UI.RadLabel();
                this.radLabel2 = new Telerik.WinControls.UI.RadLabel();
                // radLabel1
                this.radLabel1.Dock = System.Windows.Forms.DockStyle.Top;
                this.radLabel1.Location = new System.Drawing.Point(0, 0);
                this.radLabel1.Name = "radLabel1";
                this.radLabel1.Size = new System.Drawing.Size(2054, 18);
                this.radLabel1.TabIndex = 0;
                this.radLabel1.Text = resources.GetString("radLabel1.Text");
                // radLabel2
                this.radLabel2.Dock = System.Windows.Forms.DockStyle.Top;
                this.radLabel2.Location = new System.Drawing.Point(0, 18);
                this.radLabel2.Name = "radLabel2";
                this.radLabel2.Size = new System.Drawing.Size(81, 18);
                this.radLabel2.TabIndex = 1;
                this.radLabel2.Text = "MaximumSize: ";
                // Form1
                this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
                this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
                this.ClientSize = new System.Drawing.Size(504, 270);
                this.Name = "Form1";
                this.RootElement.ApplyShapeToControl = true;
                this.Text = "Form1";
                this.Resize += new System.EventHandler(this.OnResize);
            private void OnResize(object sender, EventArgs e)
                var maximumSize = new Size(Width - radLabel1.Margin.Horizontal, 0);
                radLabel1.MaximumSize = maximumSize;
                radLabel2.Text = $@"maximumSize: {maximumSize}
    radLabel1.MaximumSize: {radLabel1.MaximumSize}";
  2. Answer
    Dimitar avatar
    2881 posts

    Posted 12 Dec 2018 Link to this post

    Hello Jeremy,

    The MaxSize and other size properties need to be scaled when running on HDPI. This is expected and you need to descale the size. We have built-in methods for this. Here is what you can use for this case:
    radLabel1.MaximumSize = TelerikDpiHelper.ScaleSize(maximumSize, new SizeF(1f / this.RootElement.DpiScaleFactor.Width, 1f / this.RootElement.DpiScaleFactor.Height));

    This will work for 100% as well.

    I hope this will be useful. Let me know if you have additional questions.

    Progress Telerik
    Get quickly onboard and successful with your Telerik and/or Kendo UI products with the Virtual Classroom free technical training, available to all active customers. Learn More.
  3. Jeremy
    Jeremy avatar
    13 posts
    Member since:
    Dec 2013

    Posted 19 Dec 2018 in reply to Dimitar Link to this post

    Thanks for your help, it worked for me. 
Back to Top