Make pager a completely separate class for easier reuse
This commit is contained in:
Ensar Sarajčić
parent
53efffde51
commit
59975c77f4
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@ -11,6 +11,7 @@ import android.content.Context
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import android.graphics.*
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import android.graphics.drawable.BitmapDrawable
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import android.os.Bundle
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import android.os.Handler
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import android.text.Layout
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import android.text.StaticLayout
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import android.text.TextPaint
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@ -67,7 +68,14 @@ class HomeScreenGrid(context: Context, attrs: AttributeSet, defStyle: Int) : Rel
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private var redrawWidgets = false
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private var iconSize = 0
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private val pager = Pager()
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private val pager = AnimatedGridPager(
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getMaxPage = ::getMaxPage,
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redrawGrid = ::redrawGrid,
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getWidth = { width },
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getHandler = { handler },
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getNextPageBound = { right - sideMargins.right - cellWidth / 2 },
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getPrevPageBound = { left + sideMargins.left + cellWidth / 2 }
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)
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// apply fake margins at the home screen. Real ones would cause the icons be cut at dragging at screen sides
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var sideMargins = Rect()
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@ -203,7 +211,7 @@ class HomeScreenGrid(context: Context, attrs: AttributeSet, defStyle: Int) : Rel
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return
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}
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if (draggedItemCurrentCoords.first == -1 && draggedItemCurrentCoords.second == -1 && draggedItem != null) {
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if (draggedItemCurrentCoords.first == -1 && draggedItemCurrentCoords.second == -1) {
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if (draggedItem!!.type == ITEM_TYPE_WIDGET) {
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val draggedWidgetView = widgetViews.firstOrNull { it.tag == draggedItem?.widgetId }
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if (draggedWidgetView != null) {
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@ -965,278 +973,28 @@ class HomeScreenGrid(context: Context, attrs: AttributeSet, defStyle: Int) : Rel
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fun setSwipeMovement(diffX: Float) {
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pager.setSwipeMovement(diffX)
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if (draggedItem != null) {
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pager.setSwipeMovement(diffX)
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}
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}
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fun finalizeSwipe() {
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pager.finalizeSwipe()
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}
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}
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private inner class Pager {
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private var lastPage = 0
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private var currentPage = 0
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private var pageChangeLastArea = PageChangeArea.MIDDLE
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private var pageChangeLastAreaEntryTime = 0L
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private var pageChangeAnimLeftPercentage = 0f
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private var pageChangeEnabled = true
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private var pageChangeIndicatorsAlpha = 0f
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private var pageChangeSwipedPercentage = 0f
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fun getCurrentPage() = currentPage
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fun isItemOnCurrentPage(item: HomeScreenGridItem) = item.page == currentPage
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fun isItemOnLastPage(item: HomeScreenGridItem) = item.page == lastPage
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fun getPageCount() = max(getMaxPage(), pager.currentPage) + 1
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fun isOutsideOfPageRange() = currentPage > getMaxPage()
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fun isItemInSwipeRange(item: HomeScreenGridItem) =
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((pageChangeSwipedPercentage > 0f && item.page == currentPage - 1) || (pageChangeSwipedPercentage < 0f && item.page == currentPage + 1))
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fun isSwiped() = abs(pageChangeSwipedPercentage) > 0f
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fun isAnimatingPageChange() = pager.pageChangeAnimLeftPercentage > 0f
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fun shouldDisplayPageChangeIndicator() = isSwiped() || isAnimatingPageChange() || pageChangeIndicatorsAlpha > 0f
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fun getPageChangeIndicatorsAlpha() = if (pageChangeIndicatorsAlpha != 0f) {
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(pager.pageChangeIndicatorsAlpha * 255.0f).toInt()
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} else {
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255
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}
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fun getXFactorForCurrentPage(): Float {
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return if (abs(pageChangeSwipedPercentage) > 0f) {
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pageChangeSwipedPercentage
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} else {
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if (currentPage > lastPage) {
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pageChangeAnimLeftPercentage
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} else {
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-pageChangeAnimLeftPercentage
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}
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}
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}
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fun getXFactorForLastPage(): Float {
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return if (abs(pageChangeSwipedPercentage) > 0f) {
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(1 - abs(pageChangeSwipedPercentage)) * -sign(pageChangeSwipedPercentage)
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} else {
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if (currentPage > lastPage) {
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pageChangeAnimLeftPercentage - 1
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} else {
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1 - pageChangeAnimLeftPercentage
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}
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}
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}
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fun getCurrentViewPositionInFullPageSpace(): Float {
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val rangeStart = lastPage.toFloat()
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val rangeEndPage = if (abs(pageChangeSwipedPercentage) > 0f) {
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if (pageChangeSwipedPercentage > 0f) {
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currentPage - 1
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} else {
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currentPage + 1
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}
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} else {
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currentPage
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}
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val rangeEnd = rangeEndPage.toFloat()
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val lerpAmount = if (pageChangeAnimLeftPercentage > 0f) {
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1 - pageChangeAnimLeftPercentage
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} else {
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abs(pageChangeSwipedPercentage)
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}
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return MathUtils.lerp(rangeStart, rangeEnd, lerpAmount)
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}
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fun setSwipeMovement(diffX: Float) {
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if (!pageChangeEnabled || draggedItem != null) {
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return
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}
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if (currentPage < getMaxPage() && diffX > 0f || currentPage > 0 && diffX < 0f) {
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pageChangeSwipedPercentage = (-diffX / width.toFloat()).coerceIn(-1f, 1f)
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redrawGrid()
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}
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}
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fun finalizeSwipe() {
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if (abs(pageChangeSwipedPercentage) == 0f) {
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return
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}
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if (abs(pageChangeSwipedPercentage) > 0.5f) {
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lastPage = currentPage
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currentPage = if (pageChangeSwipedPercentage > 0f) {
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currentPage - 1
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} else {
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currentPage + 1
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}
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handlePageChange(true)
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} else {
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lastPage = if (pageChangeSwipedPercentage > 0f) {
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currentPage - 1
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} else {
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currentPage + 1
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}
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pageChangeSwipedPercentage = sign(pageChangeSwipedPercentage) * (1 - abs(pageChangeSwipedPercentage))
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handlePageChange(true)
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}
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}
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fun handleItemMovement(x: Int, y: Int) {
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showIndicators()
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if (x > right - sideMargins.right - cellWidth / 2) {
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doWithPageChangeDelay(PageChangeArea.RIGHT) {
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nextOrAdditionalPage()
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}
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} else if (x < left + sideMargins.left + cellWidth / 2) {
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doWithPageChangeDelay(PageChangeArea.LEFT) {
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prevPage()
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}
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} else {
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clearPageChangeFlags()
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}
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}
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fun itemMovementStopped() {
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scheduleIndicatorsFade()
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}
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fun nextPage(redraw: Boolean = false): Boolean {
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if (currentPage < getMaxPage() && pageChangeEnabled) {
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lastPage = currentPage
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currentPage++
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handlePageChange(redraw)
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return true
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}
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return false
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}
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fun prevPage(redraw: Boolean = false): Boolean {
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if (currentPage > 0 && pageChangeEnabled) {
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lastPage = currentPage
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currentPage--
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handlePageChange(redraw)
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return true
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}
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return false
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}
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fun skipToPage(targetPage: Int): Boolean {
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if (currentPage != targetPage && targetPage < getMaxPage() + 1) {
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lastPage = currentPage
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currentPage = targetPage
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handlePageChange()
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return true
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}
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return false
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}
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private val checkAndExecuteDelayedPageChange: Runnable = Runnable {
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if (System.currentTimeMillis() - pageChangeLastAreaEntryTime > PAGE_CHANGE_HOLD_THRESHOLD) {
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when (pageChangeLastArea) {
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PageChangeArea.RIGHT -> nextOrAdditionalPage(true)
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PageChangeArea.LEFT -> prevPage(true)
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else -> clearPageChangeFlags()
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}
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}
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}
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private val startFadingIndicators: Runnable = Runnable {
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ValueAnimator.ofFloat(1f, 0f)
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.apply {
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addUpdateListener {
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pageChangeIndicatorsAlpha = it.animatedValue as Float
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redrawGrid()
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}
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start()
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}
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}
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private fun showIndicators() {
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pageChangeIndicatorsAlpha = 1f
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removeCallbacks(startFadingIndicators)
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}
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private fun clearPageChangeFlags() {
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pageChangeLastArea = PageChangeArea.MIDDLE
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pageChangeLastAreaEntryTime = 0
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removeCallbacks(checkAndExecuteDelayedPageChange)
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}
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private fun schedulePageChange() {
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pageChangeLastAreaEntryTime = System.currentTimeMillis()
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postDelayed(checkAndExecuteDelayedPageChange, PAGE_CHANGE_HOLD_THRESHOLD)
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}
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private fun scheduleIndicatorsFade() {
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pageChangeIndicatorsAlpha = 1f
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postDelayed(startFadingIndicators, PAGE_INDICATORS_FADE_DELAY)
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}
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private fun doWithPageChangeDelay(needed: PageChangeArea, pageChangeFunction: () -> Boolean) {
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if (pageChangeLastArea != needed) {
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pageChangeLastArea = needed
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schedulePageChange()
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} else if (System.currentTimeMillis() - pageChangeLastAreaEntryTime > PAGE_CHANGE_HOLD_THRESHOLD) {
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if (pageChangeFunction()) {
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clearPageChangeFlags()
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}
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}
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}
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private fun nextOrAdditionalPage(redraw: Boolean = false): Boolean {
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if (currentPage < getMaxPage() + 1 && pageChangeEnabled) {
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lastPage = currentPage
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currentPage++
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handlePageChange(redraw)
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return true
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}
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return false
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}
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private fun handlePageChange(redraw: Boolean = false) {
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pageChangeEnabled = false
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pageChangeIndicatorsAlpha = 0f
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val startingAt = 1 - abs(pageChangeSwipedPercentage)
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pageChangeSwipedPercentage = 0f
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removeCallbacks(startFadingIndicators)
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if (redraw) {
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redrawGrid()
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}
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ValueAnimator.ofFloat(startingAt, 0f)
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.apply {
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addUpdateListener {
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pageChangeAnimLeftPercentage = it.animatedValue as Float
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redrawGrid()
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}
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addListener(object : AnimatorListenerAdapter() {
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override fun onAnimationEnd(animation: Animator) {
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super.onAnimationEnd(animation)
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pageChangeAnimLeftPercentage = 0f
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pageChangeEnabled = true
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lastPage = currentPage
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if (draggedItem != null) {
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schedulePageChange()
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} else {
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clearPageChangeFlags()
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}
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scheduleIndicatorsFade()
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redrawGrid()
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}
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})
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start()
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}
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}
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}
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/**
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* Helper class responsible for managing current page and providing utilities for animating page changes,
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* as well as partial dragigng between pages
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*/
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private class AnimatedGridPager(
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private val getMaxPage: () -> Int,
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private val redrawGrid: () -> Unit,
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private val getWidth: () -> Int,
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private val getHandler: () -> Handler,
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private val getNextPageBound: () -> Int,
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private val getPrevPageBound: () -> Int,
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) {
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companion object {
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private const val PAGE_CHANGE_HOLD_THRESHOLD = 500L
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@ -1249,4 +1007,263 @@ class HomeScreenGrid(context: Context, attrs: AttributeSet, defStyle: Int) : Rel
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}
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}
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private var lastPage = 0
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private var currentPage = 0
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private var pageChangeLastArea = PageChangeArea.MIDDLE
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private var pageChangeLastAreaEntryTime = 0L
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private var pageChangeAnimLeftPercentage = 0f
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private var pageChangeEnabled = true
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private var pageChangeIndicatorsAlpha = 0f
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private var pageChangeSwipedPercentage = 0f
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fun getCurrentPage() = currentPage
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fun isItemOnCurrentPage(item: HomeScreenGridItem) = item.page == currentPage
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fun isItemOnLastPage(item: HomeScreenGridItem) = item.page == lastPage
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fun getPageCount() = max(getMaxPage(), currentPage) + 1
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fun isOutsideOfPageRange() = currentPage > getMaxPage()
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fun isItemInSwipeRange(item: HomeScreenGridItem) =
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((pageChangeSwipedPercentage > 0f && item.page == currentPage - 1) || (pageChangeSwipedPercentage < 0f && item.page == currentPage + 1))
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fun isSwiped() = abs(pageChangeSwipedPercentage) > 0f
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fun isAnimatingPageChange() = pageChangeAnimLeftPercentage > 0f
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fun shouldDisplayPageChangeIndicator() = isSwiped() || isAnimatingPageChange() || pageChangeIndicatorsAlpha > 0f
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fun getPageChangeIndicatorsAlpha() = if (pageChangeIndicatorsAlpha != 0f) {
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(pageChangeIndicatorsAlpha * 255.0f).toInt()
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} else {
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255
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}
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fun getXFactorForCurrentPage(): Float {
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return if (abs(pageChangeSwipedPercentage) > 0f) {
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pageChangeSwipedPercentage
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} else {
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if (currentPage > lastPage) {
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pageChangeAnimLeftPercentage
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} else {
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-pageChangeAnimLeftPercentage
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}
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}
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}
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fun getXFactorForLastPage(): Float {
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return if (abs(pageChangeSwipedPercentage) > 0f) {
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(1 - abs(pageChangeSwipedPercentage)) * -sign(pageChangeSwipedPercentage)
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} else {
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if (currentPage > lastPage) {
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pageChangeAnimLeftPercentage - 1
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} else {
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1 - pageChangeAnimLeftPercentage
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}
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}
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}
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fun getCurrentViewPositionInFullPageSpace(): Float {
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val rangeStart = lastPage.toFloat()
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val rangeEndPage = if (abs(pageChangeSwipedPercentage) > 0f) {
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if (pageChangeSwipedPercentage > 0f) {
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currentPage - 1
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} else {
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currentPage + 1
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}
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} else {
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currentPage
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}
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val rangeEnd = rangeEndPage.toFloat()
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val lerpAmount = if (pageChangeAnimLeftPercentage > 0f) {
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1 - pageChangeAnimLeftPercentage
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} else {
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abs(pageChangeSwipedPercentage)
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}
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return MathUtils.lerp(rangeStart, rangeEnd, lerpAmount)
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}
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fun setSwipeMovement(diffX: Float) {
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if (!pageChangeEnabled) {
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return
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}
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if (currentPage < getMaxPage() && diffX > 0f || currentPage > 0 && diffX < 0f) {
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pageChangeSwipedPercentage = (-diffX / getWidth().toFloat()).coerceIn(-1f, 1f)
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redrawGrid()
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}
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}
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fun finalizeSwipe() {
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if (abs(pageChangeSwipedPercentage) == 0f) {
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return
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}
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if (abs(pageChangeSwipedPercentage) > 0.5f) {
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lastPage = currentPage
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currentPage = if (pageChangeSwipedPercentage > 0f) {
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currentPage - 1
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} else {
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currentPage + 1
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}
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handlePageChange(true)
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} else {
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lastPage = if (pageChangeSwipedPercentage > 0f) {
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currentPage - 1
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} else {
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currentPage + 1
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}
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pageChangeSwipedPercentage = sign(pageChangeSwipedPercentage) * (1 - abs(pageChangeSwipedPercentage))
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handlePageChange(true)
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}
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}
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fun handleItemMovement(x: Int, y: Int) {
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showIndicators()
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if (x > getNextPageBound()) {
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doWithPageChangeDelay(PageChangeArea.RIGHT) {
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nextOrAdditionalPage()
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}
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} else if (x < getPrevPageBound()) {
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doWithPageChangeDelay(PageChangeArea.LEFT) {
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prevPage()
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}
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} else {
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clearPageChangeFlags()
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}
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}
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fun itemMovementStopped() {
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scheduleIndicatorsFade()
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}
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fun nextPage(redraw: Boolean = false): Boolean {
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if (currentPage < getMaxPage() && pageChangeEnabled) {
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lastPage = currentPage
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currentPage++
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handlePageChange(redraw)
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return true
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}
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return false
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}
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fun prevPage(redraw: Boolean = false): Boolean {
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if (currentPage > 0 && pageChangeEnabled) {
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lastPage = currentPage
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currentPage--
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handlePageChange(redraw)
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return true
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}
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return false
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}
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fun skipToPage(targetPage: Int): Boolean {
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if (currentPage != targetPage && targetPage < getMaxPage() + 1) {
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lastPage = currentPage
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currentPage = targetPage
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handlePageChange()
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return true
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}
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return false
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}
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private val checkAndExecuteDelayedPageChange: Runnable = Runnable {
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if (System.currentTimeMillis() - pageChangeLastAreaEntryTime > PAGE_CHANGE_HOLD_THRESHOLD) {
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when (pageChangeLastArea) {
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PageChangeArea.RIGHT -> nextOrAdditionalPage(true)
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PageChangeArea.LEFT -> prevPage(true)
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else -> clearPageChangeFlags()
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}
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}
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}
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private val startFadingIndicators: Runnable = Runnable {
|
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ValueAnimator.ofFloat(1f, 0f)
|
||||
.apply {
|
||||
addUpdateListener {
|
||||
pageChangeIndicatorsAlpha = it.animatedValue as Float
|
||||
redrawGrid()
|
||||
}
|
||||
start()
|
||||
}
|
||||
}
|
||||
|
||||
private fun showIndicators() {
|
||||
pageChangeIndicatorsAlpha = 1f
|
||||
getHandler().removeCallbacks(startFadingIndicators)
|
||||
}
|
||||
|
||||
private fun clearPageChangeFlags() {
|
||||
pageChangeLastArea = PageChangeArea.MIDDLE
|
||||
pageChangeLastAreaEntryTime = 0
|
||||
getHandler().removeCallbacks(checkAndExecuteDelayedPageChange)
|
||||
}
|
||||
|
||||
private fun schedulePageChange() {
|
||||
pageChangeLastAreaEntryTime = System.currentTimeMillis()
|
||||
getHandler().postDelayed(checkAndExecuteDelayedPageChange, PAGE_CHANGE_HOLD_THRESHOLD)
|
||||
}
|
||||
|
||||
private fun scheduleIndicatorsFade() {
|
||||
pageChangeIndicatorsAlpha = 1f
|
||||
getHandler().postDelayed(startFadingIndicators, PAGE_INDICATORS_FADE_DELAY)
|
||||
}
|
||||
|
||||
private fun doWithPageChangeDelay(needed: PageChangeArea, pageChangeFunction: () -> Boolean) {
|
||||
if (pageChangeLastArea != needed) {
|
||||
pageChangeLastArea = needed
|
||||
schedulePageChange()
|
||||
} else if (System.currentTimeMillis() - pageChangeLastAreaEntryTime > PAGE_CHANGE_HOLD_THRESHOLD) {
|
||||
if (pageChangeFunction()) {
|
||||
clearPageChangeFlags()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
private fun nextOrAdditionalPage(redraw: Boolean = false): Boolean {
|
||||
if (currentPage < getMaxPage() + 1 && pageChangeEnabled) {
|
||||
lastPage = currentPage
|
||||
currentPage++
|
||||
handlePageChange(redraw)
|
||||
return true
|
||||
}
|
||||
|
||||
return false
|
||||
}
|
||||
|
||||
private fun handlePageChange(redraw: Boolean = false) {
|
||||
pageChangeEnabled = false
|
||||
pageChangeIndicatorsAlpha = 0f
|
||||
val startingAt = 1 - abs(pageChangeSwipedPercentage)
|
||||
pageChangeSwipedPercentage = 0f
|
||||
getHandler().removeCallbacks(startFadingIndicators)
|
||||
if (redraw) {
|
||||
redrawGrid()
|
||||
}
|
||||
ValueAnimator.ofFloat(startingAt, 0f)
|
||||
.apply {
|
||||
addUpdateListener {
|
||||
pageChangeAnimLeftPercentage = it.animatedValue as Float
|
||||
redrawGrid()
|
||||
}
|
||||
addListener(object : AnimatorListenerAdapter() {
|
||||
override fun onAnimationEnd(animation: Animator) {
|
||||
super.onAnimationEnd(animation)
|
||||
pageChangeAnimLeftPercentage = 0f
|
||||
pageChangeEnabled = true
|
||||
lastPage = currentPage
|
||||
clearPageChangeFlags()
|
||||
scheduleIndicatorsFade()
|
||||
redrawGrid()
|
||||
}
|
||||
})
|
||||
start()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue