CODEWITHSUNDEEP
c#winformsscaling
Lodestone6
Lodestone6

Reputation: 166

Is there a way to adjust font size on every control on a form with a loop?

I have a form with a bunch of labels, rich text boxes, text boxes, and buttons. I have been messing around with anchoring and autoscale(dpi/font), trying to get my UI to look more or less the same for a wide range of screen resolutions. So far, I've made some progress with getting the controls to resize properly, but now I need to adjust font sizes once the controls have changed.

I have tried the solution from this question (with a minor change to disregard the parent container and just use the label itself), which worked great for labels, but text boxes dont have a paint event, so I'm unable to get the scaling ratio from the info that would normally be passed in e.Graphics of the PaintEventArgs to give a size of the string:

 public static float NewFontSize(Graphics graphics, Size size, Font font, string str)
    {
        SizeF stringSize = graphics.MeasureString(str, font);
        float wRatio = size.Width / stringSize.Width;
        float hRatio = size.Height / stringSize.Height;
        float ratio = Math.Min(hRatio, wRatio);
        return font.Size * ratio;
    }

    private void lblTempDisp_Paint(object sender, PaintEventArgs e)
    {
        float fontSize = NewFontSize(e.Graphics, lblTempDisp.Bounds.Size, lblTempDisp.Font, lblTempDisp.Text);
        Font f = new Font("Arial", fontSize, FontStyle.Bold);
        lblTempDisp.Font = f;

    }

Primary Question: Is there a similar way to adjust the font size of text boxes?

Secondary Question: What would be the proper way to loop through all of the controls of one type on my form? I tried:

foreach (Label i in Controls)
        {
            if (i.GetType() == Label)//I get an error here that says 
            //"Label is a type, which is not valid in the given context"
            {
                i.Font = f;
            }
        }

and I know there is a way to check if a control is a label, but this doesnt seem to be it.

Upvotes: 1

Views: 609

Answers (1)

GuidoG
GuidoG

Reputation: 12014

for your second question :

foreach(Control control in Controls)
{
     if (control is Label)
     {
          ((Label)control).Font = f;
     }
}

another way is this: 

foreach (Label label in Controls.OfType<Label>())
{
    label.Font = f;
}

Upvotes: 3

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