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/*
* Copyright 2015 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ca.allanwang.kau.ui.views
import android.content.Context
import android.graphics.*
import android.graphics.drawable.Drawable
import android.text.TextPaint
import android.util.AttributeSet
import android.util.DisplayMetrics
import android.util.TypedValue
import android.view.View
import ca.allanwang.kau.ui.R
import ca.allanwang.kau.utils.dimenPixelSize
import ca.allanwang.kau.utils.getFont
import ca.allanwang.kau.utils.parentViewGroup
import ca.allanwang.kau.utils.toBitmap
/**
* A view which punches out some text from an opaque color block, allowing you to see through it.
*/
class CutoutView @JvmOverloads constructor(
context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : View(context, attrs, defStyleAttr) {
companion object {
const val PHI = 1.6182f
const val TYPE_EMPTY = 100
const val TYPE_TEXT = 101
const val TYPE_DRAWABLE = 102
}
private val paint: TextPaint = TextPaint().apply {
isAntiAlias = true
xfermode = PorterDuffXfermode(PorterDuff.Mode.CLEAR)
}
private var bitmapScaling: Float = 1f
private var cutout: Bitmap? = null
var foregroundColor = Color.MAGENTA
var text: String? = "Text"
set(value) {
field = value
cutoutType = when {
value != null -> TYPE_TEXT
drawable != null -> TYPE_DRAWABLE
else -> TYPE_EMPTY
}
}
var cutoutType: Int = TYPE_EMPTY
private var textSize: Float = 0f
private var cutoutY: Float = 0f
private var cutoutX: Float = 0f
var drawable: Drawable? = null
set(value) {
field = value
cutoutType = when {
drawable != null -> TYPE_DRAWABLE
value != null -> TYPE_TEXT
else -> TYPE_EMPTY
}
}
private var heightPercentage: Float = 0f
private var minHeight: Float = 0f
private val maxTextSize: Float
private val parentFrame = Rect()
init {
if (attrs != null) {
val a = context.obtainStyledAttributes(attrs, R.styleable.CutoutView, 0, 0)
if (a.hasValue(R.styleable.CutoutView_font))
paint.typeface = context.getFont(a.getString(R.styleable.CutoutView_font))
foregroundColor = a.getColor(R.styleable.CutoutView_foregroundColor, foregroundColor)
text = a.getString(R.styleable.CutoutView_android_text) ?: text
minHeight = a.getDimension(R.styleable.CutoutView_android_minHeight, minHeight)
heightPercentage = a.getFloat(R.styleable.CutoutView_heightPercentageToScreen, heightPercentage)
a.recycle()
}
maxTextSize = context.dimenPixelSize(R.dimen.kau_display_4_text_size).toFloat()
}
override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
super.onSizeChanged(w, h, oldw, oldh)
calculatePosition()
createBitmap()
}
private fun calculatePosition() {
when (cutoutType) {
TYPE_TEXT -> calculateTextPosition()
TYPE_DRAWABLE -> calculateImagePosition()
}
}
private fun calculateTextPosition() {
val targetWidth = width / PHI
textSize = getSingleLineTextSize(text!!, paint, targetWidth, 0f, maxTextSize,
0.5f, resources.displayMetrics)
paint.textSize = textSize
// measuring text is fun :] see: https://chris.banes.me/2014/03/27/measuring-text/
cutoutX = (width - paint.measureText(text)) / 2
val textBounds = Rect()
paint.getTextBounds(text, 0, text!!.length, textBounds)
val textHeight = textBounds.height().toFloat()
cutoutY = (height + textHeight) / 2
}
private fun calculateImagePosition() {
if (drawable!!.intrinsicHeight <= 0 || drawable!!.intrinsicWidth <= 0) throw IllegalArgumentException("Drawable's intrinsic size cannot be less than 0")
val targetWidth = width / PHI
val targetHeight = height / PHI
bitmapScaling = Math.min(targetHeight / drawable!!.intrinsicHeight, targetWidth / drawable!!.intrinsicWidth)
cutoutX = (width - drawable!!.intrinsicWidth * bitmapScaling) / 2
cutoutY = (height - drawable!!.intrinsicHeight * bitmapScaling) / 2
}
/**
* If height percent is specified, ensure it is met
*/
override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
parentViewGroup.getWindowVisibleDisplayFrame(parentFrame)
val minHeight = Math.max(minHeight, heightPercentage * parentFrame.height())
val trueHeightMeasureSpec = if (minHeight > 0)
MeasureSpec.makeMeasureSpec(Math.max(minHeight.toInt(), measuredHeight), MeasureSpec.EXACTLY)
else heightMeasureSpec
super.onMeasure(widthMeasureSpec, trueHeightMeasureSpec)
}
/**
* Recursive binary search to find the best size for the text.
* Adapted from https://github.com/grantland/android-autofittextview
*/
fun getSingleLineTextSize(text: String,
paint: TextPaint,
targetWidth: Float,
low: Float,
high: Float,
precision: Float,
metrics: DisplayMetrics): Float {
val mid = (low + high) / 2.0f
paint.textSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, mid, metrics)
val maxLineWidth = paint.measureText(text)
return when {
high - low < precision -> low
maxLineWidth > targetWidth -> getSingleLineTextSize(text, paint, targetWidth, low, mid, precision, metrics)
maxLineWidth < targetWidth -> getSingleLineTextSize(text, paint, targetWidth, mid, high, precision, metrics)
else -> mid
}
}
private fun createBitmap() {
if (cutout?.isRecycled == false)
cutout?.recycle()
if (width == 0 || height == 0) return
cutout = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888).apply {
setHasAlpha(true)
}
val cutoutCanvas = Canvas(cutout!!)
cutoutCanvas.drawColor(foregroundColor)
when (cutoutType) {
TYPE_TEXT -> {
cutoutCanvas.drawText(text!!, cutoutX, cutoutY, paint)
}
TYPE_DRAWABLE -> {
cutoutCanvas.drawBitmap(drawable!!.toBitmap(bitmapScaling, Bitmap.Config.ALPHA_8), cutoutX, cutoutY, paint)
}
TYPE_EMPTY -> {
// do nothing
}
}
}
override fun onDraw(canvas: Canvas) {
canvas.drawBitmap(cutout!!, 0f, 0f, null)
}
override fun hasOverlappingRendering(): Boolean = true
}
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