medium_atvasis_providesAutoSizeConfiguration.kt

/**********************************************************************************************************************
 * Storage of AutoSizeConfiguration
 *
 * 1 - We cannot setTextSize without disabling autosize (or use Reflection but way more fragile...)
 * 2 - Disabling autosize reset all values and attrs is not re-parsed so data is lost.
 * Due to these 2 reasons, we need a way to keep track of the previous values to restore them when required.
 *
 * The solution is to store in a static map a weak reference of the view and an AutoSizeConfiguration data class.
 * So if there is no data available (first usage or first view destroyed and recreated),
 * we store the attributes in our data class, and if there is already a data class, we re-use them.
 **********************************************************************************************************************/

private val autoSizeConfigurations = mutableMapOf<WeakReference<AppCompatTextView>, AutoSizeConfiguration>()

private data class AutoSizeConfiguration(val minTextSize: Int, val maxTextSize: Int, val stepGranularity: Int)

@SuppressLint("RestrictedApi")
private fun AppCompatTextView.providesAutoSizeConfiguration(): AutoSizeConfiguration {
    val previousConfigurations = autoSizeConfigurations.filterKeys { it.get() === this }
    return if (previousConfigurations.isNotEmpty()) {
        previousConfigurations.values.toList()[0]
    } else {
        AutoSizeConfiguration(autoSizeMinTextSize, autoSizeMaxTextSize, autoSizeStepGranularity)
            .also { autoSizeConfigurations[WeakReference(this)] = it }
    }
}

// Values copied from AppCompatTextViewAutoSizeHelper
// Default minimum size for auto-sizing text in scaled pixels.
private const val DEFAULT_AUTO_SIZE_MIN_TEXT_SIZE_IN_SP = 12f
// Default maximum size for auto-sizing text in scaled pixels.
private const val DEFAULT_AUTO_SIZE_MAX_TEXT_SIZE_IN_SP = 112f
// Default value for the step size in pixels.
private const val DEFAULT_AUTO_SIZE_GRANULARITY_IN_PX = 1

private fun AppCompatTextView.safeAutoSizeMinTextSize(previousConfiguration: AutoSizeConfiguration): Int =
    if (previousConfiguration.minTextSize != -1) previousConfiguration.minTextSize
    else TypedValue.applyDimension(
        TypedValue.COMPLEX_UNIT_SP,
        DEFAULT_AUTO_SIZE_MIN_TEXT_SIZE_IN_SP,
        resources.displayMetrics
    ).toInt()

private fun AppCompatTextView.safeAutoSizeMaxTextSize(previousConfiguration: AutoSizeConfiguration) =
    if (previousConfiguration.maxTextSize != -1) previousConfiguration.maxTextSize
    else TypedValue.applyDimension(
        TypedValue.COMPLEX_UNIT_SP,
        DEFAULT_AUTO_SIZE_MAX_TEXT_SIZE_IN_SP,
        resources.displayMetrics
    ).toInt()

private fun safeAutoSizeStepGranularity(previousConfiguration: AutoSizeConfiguration) =
    if (previousConfiguration.stepGranularity != -1) previousConfiguration.stepGranularity
    else DEFAULT_AUTO_SIZE_GRANULARITY_IN_PX