ImageZoomView

package pkp.mobile.fmcollection.custom_view

import android.content.Context
import android.graphics.Bitmap
import android.graphics.Matrix
import android.graphics.drawable.Drawable
import android.util.AttributeSet
import android.view.MotionEvent
import android.view.ScaleGestureDetector
import android.view.View
import android.widget.ImageView
import kotlinx.android.synthetic.main.activity_edit_pdf.*

/**
 * created by RIZKI RACHMANUDIN on 17/11/2022
 */
class ImageZoomView: androidx.appcompat.widget.AppCompatImageView {
    private lateinit var mBitmap: Bitmap

    private lateinit var mScaleGestureDetector: ScaleGestureDetector
    private var mScaleFactor = 1.0f

    private lateinit var mMatrix: Matrix

    constructor(context: Context) : super(context) {
        init(context)
    }

    constructor(context: Context,  attrs: AttributeSet?) : super(context, attrs) {
        init(context)
    }

    constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int) : super(context!!, attrs, defStyleAttr) {
        init(context)
    }

    private fun init(context: Context?) {
        mScaleGestureDetector = ScaleGestureDetector(context, ScaleListener())
        mMatrix = Matrix()
        mMatrix.setScale(mScaleFactor, mScaleFactor)
    }

    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec)

    }

    override fun onTouchEvent(event: MotionEvent?): Boolean {
        super.onTouchEvent(event)
        mScaleGestureDetector.onTouchEvent(event)
        performClick()
        return true
    }

    override fun performClick(): Boolean {
        super.performClick()

        return true
    }

    private inner class ScaleListener: ScaleGestureDetector.SimpleOnScaleGestureListener() {
        override fun onScale(detector: ScaleGestureDetector): Boolean {
            mScaleFactor *= detector.scaleFactor
            mScaleFactor = 0.1f.coerceAtLeast(mScaleFactor.coerceAtMost(10.0f))
//            mBitmap.scaleX = mScaleFactor
//            mBitmap.scaleY = mScaleFactor
            return true
        }
    }

}