From 35f384c19f31cc6cfe7baf1b962b201f469b8698 Mon Sep 17 00:00:00 2001 From: gedoor Date: Mon, 29 Mar 2021 00:03:16 +0800 Subject: [PATCH] viewPager --- .../app/ui/widget/page2/FrameLayoutNS.kt | 96 ------------------- .../app/ui/widget/page2/LinearLayoutNS.kt | 96 ------------------- 2 files changed, 192 deletions(-) delete mode 100644 app/src/main/java/io/legado/app/ui/widget/page2/FrameLayoutNS.kt delete mode 100644 app/src/main/java/io/legado/app/ui/widget/page2/LinearLayoutNS.kt diff --git a/app/src/main/java/io/legado/app/ui/widget/page2/FrameLayoutNS.kt b/app/src/main/java/io/legado/app/ui/widget/page2/FrameLayoutNS.kt deleted file mode 100644 index 050b4286f..000000000 --- a/app/src/main/java/io/legado/app/ui/widget/page2/FrameLayoutNS.kt +++ /dev/null @@ -1,96 +0,0 @@ -package io.legado.app.ui.widget.page2 - -import android.content.Context -import android.util.AttributeSet -import android.view.MotionEvent -import android.view.View -import android.view.ViewConfiguration -import android.widget.FrameLayout -import androidx.viewpager2.widget.ViewPager2 -import androidx.viewpager2.widget.ViewPager2.ORIENTATION_HORIZONTAL -import kotlin.math.absoluteValue -import kotlin.math.sign - -/** - * Layout to wrap a scrollable component inside a ViewPager2. Provided as a solution to the problem - * where pages of ViewPager2 have nested scrollable elements that scroll in the same direction as - * ViewPager2. The scrollable element needs to be the immediate and only child of this host layout. - * - * This solution has limitations when using multiple levels of nested scrollable elements - * (e.g. a horizontal RecyclerView in a vertical RecyclerView in a horizontal ViewPager2). - */ -class FrameLayoutNS : FrameLayout { - constructor(context: Context) : super(context) - constructor(context: Context, attrs: AttributeSet?) : super(context, attrs) - - private var touchSlop = 0 - private var initialX = 0f - private var initialY = 0f - private val parentViewPager: ViewPager2? - get() { - var v: View? = parent as? View - while (v != null && v !is ViewPager2) { - v = v.parent as? View - } - return v as? ViewPager2 - } - - private val child: View? get() = if (childCount > 0) getChildAt(0) else null - - init { - touchSlop = ViewConfiguration.get(context).scaledTouchSlop - } - - private fun canChildScroll(orientation: Int, delta: Float): Boolean { - val direction = -delta.sign.toInt() - return when (orientation) { - 0 -> child?.canScrollHorizontally(direction) ?: false - 1 -> child?.canScrollVertically(direction) ?: false - else -> throw IllegalArgumentException() - } - } - - override fun onInterceptTouchEvent(e: MotionEvent): Boolean { - handleInterceptTouchEvent(e) - return super.onInterceptTouchEvent(e) - } - - private fun handleInterceptTouchEvent(e: MotionEvent) { - val orientation = parentViewPager?.orientation ?: return - - // Early return if child can't scroll in same direction as parent - if (!canChildScroll(orientation, -1f) && !canChildScroll(orientation, 1f)) { - return - } - - if (e.action == MotionEvent.ACTION_DOWN) { - initialX = e.x - initialY = e.y - parent.requestDisallowInterceptTouchEvent(true) - } else if (e.action == MotionEvent.ACTION_MOVE) { - val dx = e.x - initialX - val dy = e.y - initialY - val isVpHorizontal = orientation == ORIENTATION_HORIZONTAL - - // assuming ViewPager2 touch-slop is 2x touch-slop of child - val scaledDx = dx.absoluteValue * if (isVpHorizontal) .5f else 1f - val scaledDy = dy.absoluteValue * if (isVpHorizontal) 1f else .5f - - if (scaledDx > touchSlop || scaledDy > touchSlop) { - if (isVpHorizontal == (scaledDy > scaledDx)) { - // Gesture is perpendicular, allow all parents to intercept - parent.requestDisallowInterceptTouchEvent(false) - } else { - // Gesture is parallel, query child if movement in that direction is possible - if (canChildScroll(orientation, if (isVpHorizontal) dx else dy)) { - // Child can scroll, disallow all parents to intercept - parent.requestDisallowInterceptTouchEvent(true) - } else { - // Child cannot scroll, allow all parents to intercept - parent.requestDisallowInterceptTouchEvent(false) - } - } - } - } - } -} \ No newline at end of file diff --git a/app/src/main/java/io/legado/app/ui/widget/page2/LinearLayoutNS.kt b/app/src/main/java/io/legado/app/ui/widget/page2/LinearLayoutNS.kt deleted file mode 100644 index b82baa455..000000000 --- a/app/src/main/java/io/legado/app/ui/widget/page2/LinearLayoutNS.kt +++ /dev/null @@ -1,96 +0,0 @@ -package io.legado.app.ui.widget.page2 - -import android.content.Context -import android.util.AttributeSet -import android.view.MotionEvent -import android.view.View -import android.view.ViewConfiguration -import android.widget.LinearLayout -import androidx.viewpager2.widget.ViewPager2 -import androidx.viewpager2.widget.ViewPager2.ORIENTATION_HORIZONTAL -import kotlin.math.absoluteValue -import kotlin.math.sign - -/** - * Layout to wrap a scrollable component inside a ViewPager2. Provided as a solution to the problem - * where pages of ViewPager2 have nested scrollable elements that scroll in the same direction as - * ViewPager2. The scrollable element needs to be the immediate and only child of this host layout. - * - * This solution has limitations when using multiple levels of nested scrollable elements - * (e.g. a horizontal RecyclerView in a vertical RecyclerView in a horizontal ViewPager2). - */ -class LinearLayoutNS : LinearLayout { - constructor(context: Context) : super(context) - constructor(context: Context, attrs: AttributeSet?) : super(context, attrs) - - private var touchSlop = 0 - private var initialX = 0f - private var initialY = 0f - private val parentViewPager: ViewPager2? - get() { - var v: View? = parent as? View - while (v != null && v !is ViewPager2) { - v = v.parent as? View - } - return v as? ViewPager2 - } - - private val child: View? get() = if (childCount > 0) getChildAt(0) else null - - init { - touchSlop = ViewConfiguration.get(context).scaledTouchSlop - } - - private fun canChildScroll(orientation: Int, delta: Float): Boolean { - val direction = -delta.sign.toInt() - return when (orientation) { - 0 -> child?.canScrollHorizontally(direction) ?: false - 1 -> child?.canScrollVertically(direction) ?: false - else -> throw IllegalArgumentException() - } - } - - override fun onInterceptTouchEvent(e: MotionEvent): Boolean { - handleInterceptTouchEvent(e) - return super.onInterceptTouchEvent(e) - } - - private fun handleInterceptTouchEvent(e: MotionEvent) { - val orientation = parentViewPager?.orientation ?: return - - // Early return if child can't scroll in same direction as parent - if (!canChildScroll(orientation, -1f) && !canChildScroll(orientation, 1f)) { - return - } - - if (e.action == MotionEvent.ACTION_DOWN) { - initialX = e.x - initialY = e.y - parent.requestDisallowInterceptTouchEvent(true) - } else if (e.action == MotionEvent.ACTION_MOVE) { - val dx = e.x - initialX - val dy = e.y - initialY - val isVpHorizontal = orientation == ORIENTATION_HORIZONTAL - - // assuming ViewPager2 touch-slop is 2x touch-slop of child - val scaledDx = dx.absoluteValue * if (isVpHorizontal) .5f else 1f - val scaledDy = dy.absoluteValue * if (isVpHorizontal) 1f else .5f - - if (scaledDx > touchSlop || scaledDy > touchSlop) { - if (isVpHorizontal == (scaledDy > scaledDx)) { - // Gesture is perpendicular, allow all parents to intercept - parent.requestDisallowInterceptTouchEvent(false) - } else { - // Gesture is parallel, query child if movement in that direction is possible - if (canChildScroll(orientation, if (isVpHorizontal) dx else dy)) { - // Child can scroll, disallow all parents to intercept - parent.requestDisallowInterceptTouchEvent(true) - } else { - // Child cannot scroll, allow all parents to intercept - parent.requestDisallowInterceptTouchEvent(false) - } - } - } - } - } -} \ No newline at end of file