A TextView library that allows the user to increase/decrease font size with a two finger gesture by the user.

Last update: Nov 23, 2022

Related tags

TextView/EditText PinchZoomTextView

Overview

PinchZoomTextView Library

This library allows you to have a TextView that will grow/shrink the font size using gestures from the user.

Usage

To have access to the library, add the dependency to your build.gradle:

	compile 'com.androidessence:pinchzoomtextview:1.0.1'

Developer Notes

By default, the zoom feature is always enabled. If for any reason you want to disable it, simply call the PinchZoomTextView#setZoomEnabled(boolean enabled) method.

Sample

To see the library in action, here is a sample of the text size changing:

Credits & Contact

PinchZoomTextView was created by:

Adam McNeilly

With special thanks to Eric Cugota for helping me get this into Bintray and make it available for you.

And it's released under Android Essence blog.

License

PinchZoomTextView is available under the MIT License. You are free to do with it what you want. If you submit a pull request, please add your name to the credits section. :)

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Comments

Killing the Android Glyph cache

You might want to think about setting the LINEAR_TEXT_FLAG flag when the ACTION_DOWN even happens and removing it on the ACTION_UP/ACTION_CANCEL event. You can use TextView.setPaintFlags to achieve this.

https://developer.android.com/reference/android/graphics/Paint.html#LINEAR_TEXT_FLAG
enhancement

opened by slightfoot 9
Bug: Scaling assumes an initial font size that's not accurate.
When this was initially built, it assumed an initial font size of 13: https://github.com/androidessence/PinchZoomTextView/blob/develop/lib-kotlin/src/main/java/com/adammcneilly/pinchzoomtextview/kotlin/PinchZoomTextView.kt#L86

That's not always accurate, and if our font size is something else, the scale doesn't seem right. To reproduce:

Set your text view size to something large, like 30sp.

Pinch to try and scale up, but the font size goes down rather than up, because of the line linked.

We need to get the initial text size and store that, and consider that in our scaling.
bug
opened by AdamMc331 0
Add Kotlin Version

While Java and Kotlin are fully interoperable, I thought it would be a fun exercise for academic purposes to create a Kotlin module for this. Aside from the personal experience, other developers could choose between a Kotlin library and Java library to import into their project, and not have to worry about any of the interrop issues.
enhancement

opened by AdamMc331 0

Owner

GitHub

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