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NestedCoordinatorLayout
import android.annotation.SuppressLint
import android.content.Context
import android.support.annotation.AttrRes
import android.support.design.widget.CoordinatorLayout
import android.support.v4.view.NestedScrollingChild2
import android.support.v4.view.NestedScrollingChildHelper
import android.util.AttributeSet
import android.view.View
import com.douglas.startpage.R
class NestedCoordinatorLayout @JvmOverloads constructor(
context: Context,
attrs: AttributeSet? = null,
@AttrRes
@SuppressLint("PrivateResource")
defStyleAttr: Int = R.attr.coordinatorLayoutStyle
) : CoordinatorLayout(context, attrs, defStyleAttr), NestedScrollingChild2 {
private val helper = NestedScrollingChildHelper(this)
init {
isNestedScrollingEnabled = true
}
override fun isNestedScrollingEnabled(): Boolean = helper.isNestedScrollingEnabled
override fun setNestedScrollingEnabled(enabled: Boolean) {
helper.isNestedScrollingEnabled = enabled
}
override fun hasNestedScrollingParent(type: Int): Boolean = helper.hasNestedScrollingParent(type)
override fun hasNestedScrollingParent(): Boolean = helper.hasNestedScrollingParent()
override fun onStartNestedScroll(child: View, target: View, axes: Int, type: Int): Boolean {
val superResult = super.onStartNestedScroll(child, target, axes, type)
return startNestedScroll(axes, type) || superResult
}
override fun onStartNestedScroll(child: View, target: View, axes: Int): Boolean {
val superResult = super.onStartNestedScroll(child, target, axes)
return startNestedScroll(axes) || superResult
}
override fun onNestedPreScroll(target: View, dx: Int, dy: Int, consumed: IntArray, type: Int) {
val superConsumed = intArrayOf(0, 0)
super.onNestedPreScroll(target, dx, dy, superConsumed, type)
val thisConsumed = intArrayOf(0, 0)
dispatchNestedPreScroll(dx, dy, thisConsumed, null)
consumed[0] = superConsumed[0] + thisConsumed[0]
consumed[1] = superConsumed[1] + thisConsumed[1]
}
override fun onNestedPreScroll(target: View, dx: Int, dy: Int, consumed: IntArray) {
val superConsumed = intArrayOf(0, 0)
super.onNestedPreScroll(target, dx, dy, superConsumed)
val thisConsumed = intArrayOf(0, 0)
dispatchNestedPreScroll(dx, dy, thisConsumed, null)
consumed[0] = superConsumed[0] + thisConsumed[0]
consumed[1] = superConsumed[1] + thisConsumed[1]
}
override fun onNestedScroll(target: View, dxConsumed: Int, dyConsumed: Int, dxUnconsumed: Int,
dyUnconsumed: Int, type: Int
) {
super.onNestedScroll(target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, type)
dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, null, type)
}
override fun onNestedScroll(target: View, dxConsumed: Int, dyConsumed: Int, dxUnconsumed: Int, dyUnconsumed: Int) {
super.onNestedScroll(target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed)
dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, null)
}
override fun onStopNestedScroll(target: View, type: Int) {
super.onStopNestedScroll(target, type)
stopNestedScroll(type)
}
override fun onStopNestedScroll(target: View) {
super.onStopNestedScroll(target)
stopNestedScroll()
}
override fun onNestedPreFling(target: View, velocityX: Float, velocityY: Float): Boolean {
val superResult = super.onNestedPreFling(target, velocityX, velocityY)
return dispatchNestedPreFling(velocityX, velocityY) || superResult
}
override fun onNestedFling(target: View, velocityX: Float, velocityY: Float, consumed: Boolean): Boolean {
val superResult = super.onNestedFling(target, velocityX, velocityY, consumed)
return dispatchNestedFling(velocityX, velocityY, consumed) || superResult
}
override fun startNestedScroll(axes: Int, type: Int): Boolean = helper.startNestedScroll(axes, type)
override fun startNestedScroll(axes: Int): Boolean = helper.startNestedScroll(axes)
override fun stopNestedScroll(type: Int) {
helper.stopNestedScroll(type)
}
override fun stopNestedScroll() {
helper.stopNestedScroll()
}
override fun dispatchNestedScroll(dxConsumed: Int, dyConsumed: Int, dxUnconsumed: Int, dyUnconsumed: Int,
offsetInWindow: IntArray?, type: Int
): Boolean = helper.dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, offsetInWindow, type)
override fun dispatchNestedScroll(dxConsumed: Int, dyConsumed: Int, dxUnconsumed: Int,
dyUnconsumed: Int, offsetInWindow: IntArray?
): Boolean = helper.dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, offsetInWindow)
override fun dispatchNestedPreScroll(dx: Int, dy: Int, consumed: IntArray?,
offsetInWindow: IntArray?, type: Int
): Boolean = helper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow, type)
override fun dispatchNestedPreScroll(dx: Int, dy: Int, consumed: IntArray?, offsetInWindow: IntArray?): Boolean =
helper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow)
override fun dispatchNestedPreFling(velocityX: Float, velocityY: Float): Boolean =
helper.dispatchNestedPreFling(velocityX, velocityY)
override fun dispatchNestedFling(velocityX: Float, velocityY: Float, consumed: Boolean): Boolean =
helper.dispatchNestedFling(velocityX, velocityY, consumed)
}
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