B4A Class SizeToFit routines (MeasureStringWidth, MeasureStringHeight, MeasureMultilineStringHeight)

Routines to adjust a label to fit its text/adjust text size to fit a label:
* SizeToFitWidth - given a width (and using the label's font), adjust the label's height
* SizeToFitHeight - given a height (and using the label's font), adjust the label's width
* SizeFontToFit - given some text for the label (and using the label's width/height), adjust the label's fontsize so that the text fills the label
* MeasureExpectedSize - Returns Width/Height/FontSize (type SizeToFit_Metrics) for a label that hasn't yet been added to a parent view
* getFontSize & setFontSize - cross-platform subs to get/set the fontsize for a label

These routines will work under Android or IOS leading to a little more portability for developers supporting Apps running on both platforms. I've not tested on B4J.
IOS version is at https://www.b4x.com/android/forum/t...ingheight-measuremultilinestringheight.84070/

They can be used in place of or in conjunction with other routines like SizeToFit, MeasureStringHeight, MeasureStringWidth, MeasureMultilineStringheight etc.

Note that the attached is not a library - it's a code module with accompanying test/demo.

Requires: StringUtils library (MeasureMultilineTextHeight), Reflector library (GetActivityBA and GetField)
 

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  • aSizeToFit v3.zip
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Misterbates

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Uploaded v2 into first post.
Bugfixes, code cleanups (to move platform dependent stuff into utility routines) plus a few new subs:
* MeasureExpectedSize - Returns Width/Height/FontSize (type SizeToFit_Metrics) for a label that hasn't yet been added to an activity/view (using Reflector object)
* getFontSize & setFontSize - cross-platform subs to get/set the fontsize for a label

I wanted the ability to calculate layout positions *before* programmatically adding labels to activities/panels. The method used is quite expensive but as long as used sparingly should be acceptable - see https://www.b4x.com/android/forum/t...ctivity-from-a-code-module.68666/#post-471562
 
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peacemaker

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Super !
Didn't you test with labels whose text was made from a CSBuilder ? That can contain images, various formatting...
 

Misterbates

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Apologies, I didn't test with CSbuilder text as I'm not using that in my app. The source is provided in the attached zip so that you can use it/test it/adjust it as needed. Would be interested to know what you find :)
 

Misterbates

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Uploaded v3. Couple of bugfixes:
  • SizeTofitWidth fixed to handle single character strings correctly.
  • MeasureExpectedSize adjusted so that if both Width and Height are zero, it'll return the smallest values (for both) that will fit the text
 

Douglas Farias

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thank you for the example. this will help me alot. thx.

just a comment.
i dont know why a emoji is detecting like 2 characters lenght.
i have tested with 🤣 and this bug.

the
B4X:
If aLabel.Text.Length < 10 Then
dont catch this emoji, because this have 2 lenght.

i m just changed to <5 and now works fine.

thxx
 
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