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-BZPVU.BOBHFSͷ࣮૷ํ๏ @MoyuruAizawa

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MoyuruAizawa Moyuru Aizawa
 Software engineer of CATS Div. CyberAgent Inc. 
 Previously at Pairs Div. Eureka Inc.

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.PZVSV"J[BXB5JNFUBCMF-BZPVU http://bit.ly/ttlayout

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‣ -BZPVU.BOBHFSͷ֓ཁ ‣ ؆қ-JOFBS-BZPVU.BOBHFSΛྫʹ࣮૷ํ๏ ࠓ೔࿩͢͜ͱ

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‣ 3FDZDMFS7JFXͷDIJMEWJFXTͷϨΠΞ΢τΛ୲౰͢ΔϞδϡʔϧ ‣ -BZPVU.BOBHFSΛม͑Δ͜ͱͰ༷ʑͳϨΠΞ΢τΛ࣮ݱ͢Δࣄ͕Ͱ͖ Δ -BZPVU.BOBHFSͷ֓ཁ

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‣ ؔ਺ػೳ͕ଟ͍ͷͰ͔ͳΓେม ‣ ϨΠΞ΢τͷෳࡶ͞Λ૿͢ཁૉ ‣ 0SJFOUBUJPO 7FSUJDBM-BZPVU)PSJ[POUBM-BZPVU ‣ 3FWFSTF-BZPVU ‣ -5335- -BZPVU.BOBHFSͷ࣮૷͸େม

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‣ PO-BZPVU$IJMESFO ‣ TDSPMM7FSUJDBMMZ#ZTDSPMM)PSJ[POUBMMZ#Z ‣ TDSPMM5P ‣ TNPPUI4DSPMM5P ‣ DPNQVUF7FSUJDBM4DSPMM&YUFOUDPNQVUF)PSJ[POUBM4DSPMM&YUFOU ‣ DPNQVUF7FSUJDBM4DSPMM0GGTFUDPNQVUF)PSJ[POUBM4DSPMM0GGTFU ‣ DPNQVUF7FSUJDBM4DSPMM3BOHFDPNQVUF)PSJ[POUBM4DSPMM3BOHF ‣ *UFN1SFGFUDI ‣ *UFN%FDPSBUJPOT ‣ *UFN"OJNBUPST ‣ 1SFEJDUJWF"OJNBUJPOT ‣ ʜ -BZPVU.BOBHFSͷؔ਺ػೳ

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‣ PO-BZPVU$IJMESFO ‣ TDSPMM7FSUJDBMMZ#ZTDSPMM)PSJ[POUBMMZ#Z ‣ TDSPMM5P ‣ TNPPUI4DSPMM5P ‣ DPNQVUF7FSUJDBM4DSPMM&YUFOUDPNQVUF)PSJ[POUBM4DSPMM&YUFOU ‣ DPNQVUF7FSUJDBM4DSPMM0GGTFUDPNQVUF)PSJ[POUBM4DSPMM0GGTFU ‣ DPNQVUF7FSUJDBM4DSPMM3BOHFDPNQVUF)PSJ[POUBM4DSPMM3BOHF ‣ *UFN1SFGFUDI ‣ *UFN%FDPSBUJPOT ‣ *UFN"OJNBUPST ‣ 1SFEJDUJWF"OJNBUJPOT ‣ ʜ -BZPVU.BOBHFSͷؔ਺ػೳ

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‣ PO-BZPVU$IJMESFO ‣ TDSPMM7FSUJDBMMZ#ZTDSPMM)PSJ[POUBMMZ#Z ‣ TDSPMM5P ‣ TNPPUI4DSPMM5P ‣ DPNQVUF7FSUJDBM4DSPMM&YUFOUDPNQVUF)PSJ[POUBM4DSPMM&YUFOU ‣ DPNQVUF7FSUJDBM4DSPMM0GGTFUDPNQVUF)PSJ[POUBM4DSPMM0GGTFU ‣ DPNQVUF7FSUJDBM4DSPMM3BOHFDPNQVUF)PSJ[POUBM4DSPMM3BOHF ‣ *UFN1SFGFUDI ‣ *UFN%FDPSBUJPOT ‣ *UFN"OJNBUPST ‣ 1SFEJDUJWF"OJNBUJPOT ‣ ʜ -BZPVU.BOBHFSͷؔ਺ػೳ

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‣ PO-BZPVU$IJMESFO ‣ TDSPMM7FSUJDBMMZ#ZTDSPMM)PSJ[POUBMMZ#Z ‣ TDSPMM5P ‣ TNPPUI4DSPMM5P ‣ DPNQVUF7FSUJDBM4DSPMM&YUFOUDPNQVUF)PSJ[POUBM4DSPMM&YUFOU ‣ DPNQVUF7FSUJDBM4DSPMM0GGTFUDPNQVUF)PSJ[POUBM4DSPMM0GGTFU ‣ DPNQVUF7FSUJDBM4DSPMM3BOHFDPNQVUF)PSJ[POUBM4DSPMM3BOHF ‣ *UFN1SFGFUDI ‣ *UFN%FDPSBUJPOT ‣ *UFN"OJNBUPST ‣ 1SFEJDUJWF"OJNBUJPOT ‣ ʜ -BZPVU.BOBHFSͷؔ਺ػೳ

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‣ PO-BZPVU$IJMESFO ‣ TDSPMM7FSUJDBMMZ#ZTDSPMM)PSJ[POUBMMZ#Z ‣ TDSPMM5P ‣ TNPPUI4DSPMM5P ‣ DPNQVUF7FSUJDBM4DSPMM&YUFOUDPNQVUF)PSJ[POUBM4DSPMM&YUFOU ‣ DPNQVUF7FSUJDBM4DSPMM0GGTFUDPNQVUF)PSJ[POUBM4DSPMM0GGTFU ‣ DPNQVUF7FSUJDBM4DSPMM3BOHFDPNQVUF)PSJ[POUBM4DSPMM3BOHF ‣ *UFN1SFGFUDI ‣ *UFN%FDPSBUJPOT ‣ *UFN"OJNBUPST ‣ 1SFEJDUJWF"OJNBUJPOT ‣ ʜ -BZPVU.BOBHFSͷؔ਺ػೳ

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‣ PO-BZPVU$IJMESFO ‣ TDSPMM7FSUJDBMMZ#ZTDSPMM)PSJ[POUBMMZ#Z ‣ TDSPMM5P ‣ TNPPUI4DSPMM5P ‣ DPNQVUF7FSUJDBM4DSPMM&YUFOUDPNQVUF)PSJ[POUBM4DSPMM&YUFOU ‣ DPNQVUF7FSUJDBM4DSPMM0GGTFUDPNQVUF)PSJ[POUBM4DSPMM0GGTFU ‣ DPNQVUF7FSUJDBM4DSPMM3BOHFDPNQVUF)PSJ[POUBM4DSPMM3BOHF ‣ *UFN1SFGFUDI ‣ *UFN%FDPSBUJPOT ‣ *UFN"OJNBUPST ‣ 1SFEJDUJWF"OJNBUJPOT ‣ ʜ -BZPVU.BOBHFSͷؔ਺ػೳ

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‣ PO-BZPVU$IJMESFO ‣ TDSPMM7FSUJDBMMZ#ZTDSPMM)PSJ[POUBMMZ#Z ‣ TDSPMM5P ‣ TNPPUI4DSPMM5P ‣ DPNQVUF7FSUJDBM4DSPMM&YUFOUDPNQVUF)PSJ[POUBM4DSPMM&YUFOU ‣ DPNQVUF7FSUJDBM4DSPMM0GGTFUDPNQVUF)PSJ[POUBM4DSPMM0GGTFU ‣ DPNQVUF7FSUJDBM4DSPMM3BOHFDPNQVUF)PSJ[POUBM4DSPMM3BOHF ‣ *UFN1SFGFUDI ‣ *UFN%FDPSBUJPOT ‣ *UFN"OJNBUPST ‣ 1SFEJDUJWF"OJNBUJPOT ‣ ʜ -BZPVU.BOBHFSͷؔ਺ػೳ

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‣ ϨΠΞ΢τͷॳظԽ ‣ BEBQUFSDIBOHF ‣ SFRVFTU-BZPVU ‣ ্͔Βॱ൪ʹϨΠΞ΢τ͍ͯ͘͠ PO-BZPVU$IJMESFO

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private fun addRow(position: Int, offsetY: Int, isAppend: Boolean, recycler: Recycler): Int { val view = recycler.getViewForPosition(position) addView(view, if (isAppend) -1 else 0) measureChildWithMargins(view, 0, 0) val height = getDecoratedMeasuredHeight(view) val width = getDecoratedMeasuredWidth(view) val top = if (isAppend) offsetY else offsetY - height val bottom = top + height layoutDecoratedWithMargins( view, parentLeft, top, parentLeft + width, bottom) return height } PO-BZPVU$IJMESFO

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private fun addRow(position: Int, offsetY: Int, isAppend: Boolean, recycler: Recycler): Int { val view = recycler.getViewForPosition(position) addView(view, if (isAppend) -1 else 0) measureChildWithMargins(view, 0, 0) val height = getDecoratedMeasuredHeight(view) val width = getDecoratedMeasuredWidth(view) val top = if (isAppend) offsetY else offsetY - height val bottom = top + height layoutDecoratedWithMargins( view, parentLeft, top, parentLeft + width, bottom) return height } PO-BZPVU$IJMESFO

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private fun addRow(position: Int, offsetY: Int, isAppend: Boolean, recycler: Recycler): Int { val view = recycler.getViewForPosition(position) addView(view, if (isAppend) -1 else 0) measureChildWithMargins(view, 0, 0) val height = getDecoratedMeasuredHeight(view) val width = getDecoratedMeasuredWidth(view) val top = if (isAppend) offsetY else offsetY - height val bottom = top + height layoutDecoratedWithMargins( view, parentLeft, top, parentLeft + width, bottom) return height } PO-BZPVU$IJMESFO

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private fun addRow(position: Int, offsetY: Int, isAppend: Boolean, recycler: Recycler): Int { val view = recycler.getViewForPosition(position) addView(view, if (isAppend) -1 else 0) measureChildWithMargins(view, 0, 0) val height = getDecoratedMeasuredHeight(view) val width = getDecoratedMeasuredWidth(view) val top = if (isAppend) offsetY else offsetY - height val bottom = top + height layoutDecoratedWithMargins( view, parentLeft, top, parentLeft + width, bottom) return height } PO-BZPVU$IJMESFO

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private fun addRow(position: Int, offsetY: Int, isAppend: Boolean, recycler: Recycler): Int { val view = recycler.getViewForPosition(position) addView(view, if (isAppend) -1 else 0) measureChildWithMargins(view, 0, 0) val height = getDecoratedMeasuredHeight(view) val width = getDecoratedMeasuredWidth(view) val top = if (isAppend) offsetY else offsetY - height val bottom = top + height layoutDecoratedWithMargins( view, parentLeft, top, parentLeft + width, bottom) return height } PO-BZPVU$IJMESFO

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private fun addRow(position: Int, offsetY: Int, isAppend: Boolean, recycler: Recycler): Int { val view = recycler.getViewForPosition(position) addView(view, if (isAppend) -1 else 0) measureChildWithMargins(view, 0, 0) val height = getDecoratedMeasuredHeight(view) val width = getDecoratedMeasuredWidth(view) val top = if (isAppend) offsetY else offsetY - height val bottom = top + height layoutDecoratedWithMargins( view, parentLeft, top, parentLeft + width, bottom) return height } PO-BZPVU$IJMESFO

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private fun addRow(position: Int, offsetY: Int, isAppend: Boolean, recycler: Recycler): Int { val view = recycler.getViewForPosition(position) addView(view, if (isAppend) -1 else 0) measureChildWithMargins(view, 0, 0) val height = getDecoratedMeasuredHeight(view) val width = getDecoratedMeasuredWidth(view) val top = if (isAppend) offsetY else offsetY - height val bottom = top + height layoutDecoratedWithMargins( view, parentLeft, top, parentLeft + width, bottom) return height } PO-BZPVU$IJMESFO

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private fun addRow(position: Int, offsetY: Int, isAppend: Boolean, recycler: Recycler): Int { val view = recycler.getViewForPosition(position) addView(view, if (isAppend) -1 else 0) measureChildWithMargins(view, 0, 0) val height = getDecoratedMeasuredHeight(view) val width = getDecoratedMeasuredWidth(view) val top = if (isAppend) offsetY else offsetY - height val bottom = top + height layoutDecoratedWithMargins( view, parentLeft, top, parentLeft + width, bottom) return height } PO-BZPVU$IJMESFO

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private fun addRow(position: Int, offsetY: Int, isAppend: Boolean, recycler: Recycler): Int { val view = recycler.getViewForPosition(position) addView(view, if (isAppend) -1 else 0) measureChildWithMargins(view, 0, 0) val height = getDecoratedMeasuredHeight(view) val width = getDecoratedMeasuredWidth(view) val top = if (isAppend) offsetY else offsetY - height val bottom = top + height layoutDecoratedWithMargins( view, parentLeft, top, parentLeft + width, bottom) return height } PO-BZPVU$IJMESFO

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private fun addRow(position: Int, offsetY: Int, isAppend: Boolean, recycler: Recycler): Int { val view = recycler.getViewForPosition(position) addView(view, if (isAppend) -1 else 0) measureChildWithMargins(view, 0, 0) val height = getDecoratedMeasuredHeight(view) val width = getDecoratedMeasuredWidth(view) val top = if (isAppend) offsetY else offsetY - height val bottom = top + height layoutDecoratedWithMargins( view, parentLeft, top, parentLeft + width, bottom) return height } PO-BZPVU$IJMESFO

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private fun fillChunk(startPosition: Int, startY: Int, isAppend: Boolean, recycler: Recycler) { val remainingSpace = if (isAppend) parentBottom - startY else startY - parentTop var offsetY = startY val range = if (isAppend) startPosition until itemCount else startPosition downTo 0 for (position in range) { val height = addRow(position, offsetY, isAppend, recycler) offsetY += if (isAppend) height else -height val consumed = abs(offsetY - startY) if (consumed > remainingSpace) break } } PO-BZPVU$IJMESFO

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private fun fillChunk(startPosition: Int, startY: Int, isAppend: Boolean, recycler: Recycler) { val remainingSpace = if (isAppend) parentBottom - startY else startY - parentTop var offsetY = startY val range = if (isAppend) startPosition until itemCount else startPosition downTo 0 for (position in range) { val height = addRow(position, offsetY, isAppend, recycler) offsetY += if (isAppend) height else -height val consumed = abs(offsetY - startY) if (consumed > remainingSpace) break } } PO-BZPVU$IJMESFO

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private fun fillChunk(startPosition: Int, startY: Int, isAppend: Boolean, recycler: Recycler) { val remainingSpace = if (isAppend) parentBottom - startY else startY - parentTop var offsetY = startY val range = if (isAppend) startPosition until itemCount else startPosition downTo 0 for (position in range) { val height = addRow(position, offsetY, isAppend, recycler) offsetY += if (isAppend) height else -height val consumed = abs(offsetY - startY) if (consumed > remainingSpace) break } } PO-BZPVU$IJMESFO

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private fun fillChunk(startPosition: Int, startY: Int, isAppend: Boolean, recycler: Recycler) { val remainingSpace = if (isAppend) parentBottom - startY else startY - parentTop var offsetY = startY val range = if (isAppend) startPosition until itemCount else startPosition downTo 0 for (position in range) { val height = addRow(position, offsetY, isAppend, recycler) offsetY += if (isAppend) height else -height val consumed = abs(offsetY - startY) if (consumed > remainingSpace) break } } PO-BZPVU$IJMESFO

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override fun onLayoutChildren(recycler: Recycler, state: State) { if (itemCount == 0) { detachAndScrapAttachedViews(recycler) return } val restoredFirstVisibleView = getChildAt(0) val restoredPosition = restoredFirstVisibleView?.adapterPosition val restoredTop = restoredFirstVisibleView?.let(this::getDecoratedTop) if (childCount > 0) detachAndScrapAttachedViews(recycler) fillChunk(restoredPosition ?: 0, restoredTop ?: parentTop, isAppend = true, recycler = recycler) } PO-BZPVU$IJMESFO

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override fun onLayoutChildren(recycler: Recycler, state: State) { if (itemCount == 0) { detachAndScrapAttachedViews(recycler) return } val restoredFirstVisibleView = getChildAt(0) val restoredPosition = restoredFirstVisibleView?.adapterPosition val restoredTop = restoredFirstVisibleView?.let(this::getDecoratedTop) if (childCount > 0) detachAndScrapAttachedViews(recycler) fillChunk(restoredPosition ?: 0, restoredTop ?: parentTop, isAppend = true, recycler = recycler) } PO-BZPVU$IJMESFO

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override fun onLayoutChildren(recycler: Recycler, state: State) { if (itemCount == 0) { detachAndScrapAttachedViews(recycler) return } val restoredFirstVisibleView = getChildAt(0) val restoredPosition = restoredFirstVisibleView?.adapterPosition val restoredTop = restoredFirstVisibleView?.let(this::getDecoratedTop) if (childCount > 0) detachAndScrapAttachedViews(recycler) fillChunk(restoredPosition ?: 0, restoredTop ?: parentTop, isAppend = true, recycler = recycler) } PO-BZPVU$IJMESFO

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override fun onLayoutChildren(recycler: Recycler, state: State) { if (itemCount == 0) { detachAndScrapAttachedViews(recycler) return } val restoredFirstVisibleView = getChildAt(0) val restoredPosition = restoredFirstVisibleView?.adapterPosition val restoredTop = restoredFirstVisibleView?.let(this::getDecoratedTop) if (childCount > 0) detachAndScrapAttachedViews(recycler) fillChunk(restoredPosition ?: 0, restoredTop ?: parentTop, isAppend = true, recycler = recycler) } PO-BZPVU$IJMESFO

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override fun onSaveInstanceState(): Parcelable? { val firstVisibleItem = getChildAt(0) ?: return null return SavedState(firstVisibleItem.adapterPosition, getDecoratedTop(firstVisibleItem)) } override fun onRestoreInstanceState(state: Parcelable?) { savedState = state as? SavedState } PO-BZPVU$IJMESFO

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val restoredFirstVisibleView = getChildAt(0) val restoredPosition = savedState?.firstVisibleItemPosition ?: restoredFirstVisibleView?.adapterPosition val restoredTop = savedState?.firstVisibleItemTop ?: restoredFirstVisibleView?.let(this::getDecoratedTop) if (childCount > 0) detachAndScrapAttachedViews(recycler) if (restoredPosition != null && restoredTop != null && restoredPosition < itemCount) fillChunk(restoredPosition, restoredTop, isAppend = true, recycler = recycler) else fillChunk(0, parentTop, isAppend = true, recycler = recycler) PO-BZPVU$IJMESFO

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override fun onLayoutCompleted(state: State?) { savedState = null } PO-BZPVU$PNQMFUFE

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‣ DIJMEWJFXTͷεϥΠυ ‣ ը໘͔Βग़ͨDIJMEWJFXTͷSFNPWF ‣ ۭ͖εϖʔεʹDIJMEWJFXTͷBEE TDSPMM7FSUJDBMMZ#Z

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‣ DIJMEWJFXTͷεϥΠυ ‣ ը໘͔Βग़ͨDIJMEWJFXTͷSFNPWF ‣ ۭ͖εϖʔεʹDIJMEWJFXTͷBEE TDSPMM7FSUJDBMMZ#Z

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‣ DIJMEWJFXTͷεϥΠυ ‣ ը໘͔Βग़ͨDIJMEWJFXTͷSFNPWF ‣ ۭ͖εϖʔεʹDIJMEWJFXTͷBEE TDSPMM7FSUJDBMMZ#Z

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‣ DIJMEWJFXTͷεϥΠυ ‣ ը໘͔Βग़ͨDIJMEWJFXTͷSFNPWF ‣ ۭ͖εϖʔεʹDIJMEWJFXTͷBEE TDSPMM7FSUJDBMMZ#Z

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private fun calculateActualDy(dy: Int): Int { if (dy == 0) return 0 return if (dy > 0) { // up swipe val lastView = getChildAt(childCount - 1) ?: return 0 val bottom = getDecoratedBottom(lastView) if (lastView.adapterPosition == itemCount - 1) if (bottom == parentBottom) 0 else min(bottom - parentBottom, dy) else dy } else { val firstView = getChildAt(0) ?: return 0 val top = getDecoratedTop(firstView) if (firstView.adapterPosition == 0) if (top == parentTop) 0 else max(top - parentTop, dy) else dy } } TDSPMM7FSUJDBMMZ#Z

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private fun calculateActualDy(dy: Int): Int { if (dy == 0) return 0 return if (dy > 0) { // up swipe val lastView = getChildAt(childCount - 1) ?: return 0 val bottom = getDecoratedBottom(lastView) if (lastView.adapterPosition == itemCount - 1) if (bottom == parentBottom) 0 else min(bottom - parentBottom, dy) else dy } else { val firstView = getChildAt(0) ?: return 0 val top = getDecoratedTop(firstView) if (firstView.adapterPosition == 0) if (top == parentTop) 0 else max(top - parentTop, dy) else dy } } TDSPMM7FSUJDBMMZ#Z

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private fun calculateActualDy(dy: Int): Int { if (dy == 0) return 0 return if (dy > 0) { // up swipe val lastView = getChildAt(childCount - 1) ?: return 0 val bottom = getDecoratedBottom(lastView) if (lastView.adapterPosition == itemCount - 1) if (bottom == parentBottom) 0 else min(bottom - parentBottom, dy) else dy } else { val firstView = getChildAt(0) ?: return 0 val top = getDecoratedTop(firstView) if (firstView.adapterPosition == 0) if (top == parentTop) 0 else max(top - parentTop, dy) else dy } } TDSPMM7FSUJDBMMZ#Z

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private fun calculateActualDy(dy: Int): Int { if (dy == 0) return 0 return if (dy > 0) { // up swipe val lastView = getChildAt(childCount - 1) ?: return 0 val bottom = getDecoratedBottom(lastView) if (lastView.adapterPosition == itemCount - 1) if (bottom == parentBottom) 0 else min(bottom - parentBottom, dy) else dy } else { val firstView = getChildAt(0) ?: return 0 val top = getDecoratedTop(firstView) if (firstView.adapterPosition == 0) if (top == parentTop) 0 else max(top - parentTop, dy) else dy } } TDSPMM7FSUJDBMMZ#Z

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private fun recycleTop(recycler: Recycler) { children.forEach { if (getDecoratedBottom(it) < parentTop) removeAndRecycleView(it, recycler) else return } } TDSPMM7FSUJDBMMZ#Z

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private fun recycleTop(recycler: Recycler) { children.forEach { if (getDecoratedBottom(it) < parentTop) removeAndRecycleView(it, recycler) else return } } TDSPMM7FSUJDBMMZ#Z

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private fun recycleTop(recycler: Recycler) { children.forEach { if (getDecoratedBottom(it) < parentTop) removeAndRecycleView(it, recycler) else return } } TDSPMM7FSUJDBMMZ#Z

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override fun scrollVerticallyBy(dy: Int, recycler: Recycler, state: State): Int { val actualDy = calculateActualDy(dy) if (actualDy == 0) return 0 offsetChildrenVertical(-actualDy) if (actualDy > 0) { recycleTop(recycler) val lastView = getChildAt(childCount - 1) ?: return 0 val bottom = getDecoratedBottom(lastView) if (bottom < parentBottom) fillChunk(lastView.adapterPosition + 1, bottom, true, recycler) } else { … } return actualDy } TDSPMM7FSUJDBMMZ#Z

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override fun scrollVerticallyBy(dy: Int, recycler: Recycler, state: State): Int { val actualDy = calculateActualDy(dy) if (actualDy == 0) return 0 offsetChildrenVertical(-actualDy) if (actualDy > 0) { recycleTop(recycler) val lastView = getChildAt(childCount - 1) ?: return 0 val bottom = getDecoratedBottom(lastView) if (bottom < parentBottom) fillChunk(lastView.adapterPosition + 1, bottom, true, recycler) } else { … } return actualDy } TDSPMM7FSUJDBMMZ#Z

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override fun scrollVerticallyBy(dy: Int, recycler: Recycler, state: State): Int { val actualDy = calculateActualDy(dy) if (actualDy == 0) return 0 offsetChildrenVertical(-actualDy) if (actualDy > 0) { recycleTop(recycler) val lastView = getChildAt(childCount - 1) ?: return 0 val bottom = getDecoratedBottom(lastView) if (bottom < parentBottom) fillChunk(lastView.adapterPosition + 1, bottom, true, recycler) } else { … } return actualDy } TDSPMM7FSUJDBMMZ#Z

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override fun scrollVerticallyBy(dy: Int, recycler: Recycler, state: State): Int { val actualDy = calculateActualDy(dy) if (actualDy == 0) return 0 offsetChildrenVertical(-actualDy) if (actualDy > 0) { recycleTop(recycler) val lastView = getChildAt(childCount - 1) ?: return 0 val bottom = getDecoratedBottom(lastView) if (bottom < parentBottom) fillChunk(lastView.adapterPosition + 1, bottom, true, recycler) } else { … } return actualDy } TDSPMM7FSUJDBMMZ#Z

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override fun scrollVerticallyBy(dy: Int, recycler: Recycler, state: State): Int { val actualDy = calculateActualDy(dy) if (actualDy == 0) return 0 offsetChildrenVertical(-actualDy) if (actualDy > 0) { recycleTop(recycler) val lastView = getChildAt(childCount - 1) ?: return 0 val bottom = getDecoratedBottom(lastView) if (bottom < parentBottom) fillChunk(lastView.adapterPosition + 1, bottom, true, recycler) } else { … } return actualDy } TDSPMM7FSUJDBMMZ#Z

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override fun scrollVerticallyBy(dy: Int, recycler: Recycler, state: State): Int { val actualDy = calculateActualDy(dy) if (actualDy == 0) return 0 offsetChildrenVertical(-actualDy) if (actualDy > 0) { recycleTop(recycler) val lastView = getChildAt(childCount - 1) ?: return 0 val bottom = getDecoratedBottom(lastView) if (bottom < parentBottom) fillChunk(lastView.adapterPosition + 1, bottom, true, recycler) } else { … } return actualDy } TDSPMM7FSUJDBMMZ#Z

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‣ ࢦఆϙδγϣϯͰMBZPVU͠௚͢ TDSPMM5P1PTJUJPO

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override fun scrollToPosition(position: Int) { pendingScrollPosition = position requestLayout() } TDSPMM5P1PTJUJPO

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override fun onLayoutChildren(recycler: Recycler, state: State) { … if (pendingScrollPosition != RecyclerView.NO_POSITION) { fillChunk(pendingScrollPosition, parentTop, true, recycler) val lastVisibleView = getChildAt(childCount - 1) ?: return val bottom = getDecoratedBottom(lastVisibleView) if (lastVisibleView.adapterPosition.isLast && bottom < parentBottom) fixLayoutGap() return } … } TDSPMM5P1PTJUJPO

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override fun onLayoutChildren(recycler: Recycler, state: State) { … if (pendingScrollPosition != RecyclerView.NO_POSITION) { fillChunk(pendingScrollPosition, parentTop, true, recycler) val lastVisibleView = getChildAt(childCount - 1) ?: return val bottom = getDecoratedBottom(lastVisibleView) if (lastVisibleView.adapterPosition.isLast && bottom < parentBottom) fixLayoutGap() return } … } TDSPMM5P1PTJUJPO

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override fun onLayoutChildren(recycler: Recycler, state: State) { … if (pendingScrollPosition != RecyclerView.NO_POSITION) { fillChunk(pendingScrollPosition, parentTop, true, recycler) val lastVisibleView = getChildAt(childCount - 1) ?: return val bottom = getDecoratedBottom(lastVisibleView) if (lastVisibleView.adapterPosition.isLast && bottom < parentBottom) fixLayoutGap() return } … } TDSPMM5P1PTJUJPO 99

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override fun onLayoutChildren(recycler: Recycler, state: State) { … if (pendingScrollPosition != RecyclerView.NO_POSITION) { fillChunk(pendingScrollPosition, parentTop, true, recycler) val lastVisibleView = getChildAt(childCount - 1) ?: return val bottom = getDecoratedBottom(lastVisibleView) if (lastVisibleView.adapterPosition.isLast && bottom < parentBottom) fixLayoutGap() return } … } TDSPMM5P1PTJUJPO 99

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override fun onLayoutChildren(recycler: Recycler, state: State) { … if (pendingScrollPosition != RecyclerView.NO_POSITION) { fillChunk(pendingScrollPosition, parentTop, true, recycler) val lastVisibleView = getChildAt(childCount - 1) ?: return val bottom = getDecoratedBottom(lastVisibleView) if (lastVisibleView.adapterPosition.isLast && bottom < parentBottom) fixLayoutGap() return } … } TDSPMM5P1PTJUJPO 99 98 97 96 95

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