75 lines
2.1 KiB
Kotlin
75 lines
2.1 KiB
Kotlin
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package jp.juggler.subwaytooter.span
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import android.content.Context
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import android.graphics.Canvas
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import android.graphics.Paint
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import android.graphics.drawable.Drawable
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import android.support.annotation.IntRange
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import android.support.v4.content.ContextCompat
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import android.text.style.ReplacementSpan
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import java.lang.ref.WeakReference
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class EmojiImageSpan(context : Context, private val res_id : Int) : ReplacementSpan() {
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companion object {
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// private static final LogCategory log = new LogCategory( "EmojiImageSpan" );
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// static DynamicDrawableSpan x = null;
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private const val scale_ratio = 1.14f
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private const val descent_ratio = 0.211f
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}
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private val context : Context
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private var mDrawableRef : WeakReference<Drawable>? = null
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private val cachedDrawable : Drawable?
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get() {
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var d = mDrawableRef?.get()
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if(d == null) {
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d = ContextCompat.getDrawable(context, res_id) ?: return null
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mDrawableRef = WeakReference(d)
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}
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return d
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}
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init {
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this.context = context.applicationContext
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}
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override fun getSize(
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paint : Paint, text : CharSequence, @IntRange(from = 0) start : Int, @IntRange(from = 0) end : Int, fm : Paint.FontMetricsInt?
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) : Int {
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val size = (0.5f + scale_ratio * paint.textSize).toInt()
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if(fm != null) {
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val c_descent = (0.5f + size * descent_ratio).toInt()
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val c_ascent = c_descent - size
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if(fm.ascent > c_ascent) fm.ascent = c_ascent
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if(fm.top > c_ascent) fm.top = c_ascent
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if(fm.descent < c_descent) fm.descent = c_descent
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if(fm.bottom < c_descent) fm.bottom = c_descent
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}
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return size
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}
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override fun draw(
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canvas : Canvas, text : CharSequence, start : Int, end : Int, x : Float, top : Int, baseline : Int, bottom : Int, paint : Paint
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) {
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val size = (0.5f + scale_ratio * paint.textSize).toInt()
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val c_descent = (0.5f + size * descent_ratio).toInt()
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val transY = baseline - size + c_descent
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val d = cachedDrawable ?: return
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canvas.save()
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canvas.translate(x, transY.toFloat())
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d.setBounds(0, 0, size, size)
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d.draw(canvas)
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canvas.restore()
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}
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}
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