document-processing-docs/knowledge-base/create-custom-text-measurer-net-standard.md

title	description	type	page_title	slug	position	tags	res_type
Create Custom Text Measurer in .NET Standard	How to implement custom text measuring functionality in SpreadProcessing for .NET Standard.	how-to	Create Custom Text Measurer .NET Standard	create-custom-text-measurer-net-standard	0	spreadsheet, custom, text, measurer, netstandard	kb

Product Version	Product	Author
2021.1.212	RadSpreadProcessing	Martin Velikov

Description

Due to .NET Standard APIs limitations, the SimpleTextMeasurer provides basic functionality for text measuring and it is not expected to be an all-purpose measurer. So in order to measure the specific text in a more precise way, you will need to create a custom implementation of a text measure and set it to the TextMeasurer property of the SpreadExtensibilityManager.

Solution

In the example below, we are demonstrating how to create a custom TextMeasurer inheriting the SpreadTextMeasurerBase abstract class and set it to the TextMeasurer property of the SpreadExtensibilityManager.

[C#] Creating a CustomTextMeasurer

{{region kb-create-custom-text-measurer-net-standard1}}

public class CustomTextMeasurer : SpreadTextMeasurerBase
{
    private static readonly double ratioX = 1.035;
    private static readonly double ratioY = 1;
    private static readonly double ratioBaseline = 1;

    private readonly SpreadTextMeasurerBase originalMeasurer;

    public CustomTextMeasurer(SpreadTextMeasurerBase originalMeasurer)
    {
        this.originalMeasurer = originalMeasurer;
    }

    public override TextMeasurementInfo MeasureText(TextProperties textProperties, FontProperties fontProperties)
    {
        TextMeasurementInfo info = originalMeasurer.MeasureText(textProperties, fontProperties);

        Size size = info.Size;
        return new TextMeasurementInfo()
        {
            BaselineOffset = info.BaselineOffset * ratioBaseline,
            Size = new Size(
                size.Width * ratioX,
                size.Height * ratioY),
        };
    }

    public override TextMeasurementInfo MeasureTextWithWrapping(TextProperties textProperties, FontProperties fontProperties, double wrappingWidth)
    {
        TextMeasurementInfo info = originalMeasurer.MeasureText(textProperties, fontProperties);

        Size size = info.Size;
        return new TextMeasurementInfo()
        {
            BaselineOffset = info.BaselineOffset * ratioBaseline,
            Size = new Size(
                size.Width * ratioX,
                size.Height * ratioY),
        };
    }
}

{{endregion}}

The following example shows how to set the custom implementation inheriting the SpreadTextMeasurerBase abstract class to the TextMeasurer property of the SpreadExtensibilityManager.

[C#] Setting the CustomTextMeasurer

{{region kb-create-custom-text-measurer-net-standard2}}

SpreadTextMeasurerBase customTextMeasurer = new CustomTextMeasurer(SpreadExtensibilityManager.TextMeasurer); 
SpreadExtensibilityManager.TextMeasurer = customTextMeasurer; 

{{endregion}}

See Also

• [How to Measure Text in WordsProcessing .NET Framework]({%slug wordsprocessing-measure-text-netframework%})
• [How to Measure Text in WordsProcessing .NET Standard]({%slug wordsprocessing-measure-text-netstandard%})