79 lines
2.5 KiB
Kotlin
79 lines
2.5 KiB
Kotlin
package jp.juggler.subwaytooter.actmain
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import android.content.Context
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import android.util.AttributeSet
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import android.view.MotionEvent
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import android.view.ViewConfiguration
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import androidx.recyclerview.widget.RecyclerView
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import kotlin.math.abs
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class TabletModeRecyclerView : RecyclerView {
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private var mForbidStartDragging: Boolean = false
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private var mScrollPointerId: Int = 0
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private var mInitialTouchX: Int = 0
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private var mInitialTouchY: Int = 0
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private var mTouchSlop: Int = 0
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constructor(context: Context) : super(context) {
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init(context)
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}
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constructor(context: Context, attrs: AttributeSet?) : super(context, attrs) {
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init(context)
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}
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constructor(context: Context, attrs: AttributeSet?, defStyle: Int) : super(
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context,
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attrs,
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defStyle
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) {
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init(context)
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}
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private fun init(context: Context) {
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val vc = ViewConfiguration.get(context)
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mTouchSlop = vc.scaledTouchSlop
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}
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override fun onInterceptTouchEvent(e: MotionEvent): Boolean {
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// final int actionIndex = e.getActionIndex( );
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when (e.action) {
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MotionEvent.ACTION_DOWN -> {
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mForbidStartDragging = false
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mScrollPointerId = e.getPointerId(0)
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mInitialTouchX = (e.x + 0.5f).toInt()
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mInitialTouchY = (e.y + 0.5f).toInt()
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}
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MotionEvent.ACTION_MOVE -> {
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val index = e.findPointerIndex(mScrollPointerId)
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if (index >= 0) {
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if (mForbidStartDragging) return false
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val layoutManager = this.layoutManager ?: return false
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val x = (e.getX(index) + 0.5f).toInt()
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val y = (e.getY(index) + 0.5f).toInt()
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val canScrollHorizontally = layoutManager.canScrollHorizontally()
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val canScrollVertically = layoutManager.canScrollVertically()
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val dx = x - mInitialTouchX
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val dy = y - mInitialTouchY
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if (!canScrollVertically && abs(dy) > mTouchSlop || !canScrollHorizontally && abs(
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dx
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) > mTouchSlop
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) {
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mForbidStartDragging = true
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return false
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}
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}
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}
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}
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return super.onInterceptTouchEvent(e)
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}
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}
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