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@ -7,13 +7,11 @@ import android.os.Bundle |
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import android.view.Menu |
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import android.view.MenuItem |
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import android.view.View |
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import android.view.ViewGroup |
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import androidx.appcompat.widget.SearchView |
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import androidx.fragment.app.* |
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import androidx.lifecycle.LiveData |
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import androidx.viewpager2.adapter.FragmentStateAdapter |
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import androidx.viewpager2.widget.ViewPager2 |
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import com.google.android.material.tabs.TabLayout |
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import com.google.android.material.tabs.TabLayoutMediator |
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import io.legado.app.R |
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import io.legado.app.base.VMBaseFragment |
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import io.legado.app.constant.AppConst |
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@ -33,7 +31,6 @@ import io.legado.app.ui.book.local.ImportBookActivity |
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import io.legado.app.ui.book.search.SearchActivity |
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import io.legado.app.ui.filepicker.FilePicker |
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import io.legado.app.ui.filepicker.FilePickerDialog |
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import io.legado.app.ui.main.MainActivity |
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import io.legado.app.ui.main.MainViewModel |
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import io.legado.app.ui.main.bookshelf.books.BooksFragment |
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import io.legado.app.utils.* |
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@ -51,18 +48,12 @@ class BookshelfFragment : VMBaseFragment<BookshelfViewModel>(R.layout.fragment_b |
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private val binding by viewBinding(FragmentBookshelfBinding::bind) |
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override val viewModel: BookshelfViewModel by viewModels() |
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private val activityViewModel: MainViewModel by activityViewModels() |
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private lateinit var adapter: FragmentStatePagerAdapter |
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private lateinit var tabLayout: TabLayout |
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private var bookGroupLiveData: LiveData<List<BookGroup>>? = null |
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private val bookGroups = mutableListOf<BookGroup>() |
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private val fragmentMap = hashMapOf<Long, BooksFragment>() |
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private var currentPosition = 0 //当前滑动位置 |
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private var oldPosition = 0 //上一个滑动位置 |
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private var currentState = 0 //记录当前手指按下状态 |
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private var scrolledPixList = mutableListOf<Int>() //记录手指滑动时的像素坐标记录 |
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private val mainActivity get() = activity as MainActivity |
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override fun onFragmentCreated(view: View, savedInstanceState: Bundle?) { |
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tabLayout = binding.titleBar.findViewById(R.id.tab_layout) |
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setSupportToolbar(binding.titleBar.toolbar) |
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@ -110,64 +101,15 @@ class BookshelfFragment : VMBaseFragment<BookshelfViewModel>(R.layout.fragment_b |
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private val selectedGroup: BookGroup |
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get() = bookGroups[tabLayout.selectedTabPosition] |
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private fun initView() = with(binding) { |
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ATH.applyEdgeEffectColor(viewPagerBookshelf) |
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private fun initView() { |
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ATH.applyEdgeEffectColor(binding.viewPagerBookshelf) |
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tabLayout.isTabIndicatorFullWidth = false |
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tabLayout.tabMode = TabLayout.MODE_SCROLLABLE |
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tabLayout.setSelectedTabIndicatorColor(requireContext().accentColor) |
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viewPagerBookshelf.offscreenPageLimit = 1 |
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viewPagerBookshelf.adapter = TabFragmentPageAdapter() |
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TabLayoutMediator(tabLayout, viewPagerBookshelf) { tab, i -> |
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tab.text = bookGroups[i].groupName |
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}.attach() |
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viewPagerBookshelf.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() { |
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//页面滚动的位置信息回调： position 当前滚动到哪个页面，positionOffset 位置偏移百分比, positionOffsetPixels 当前所在页面偏移量 |
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//此回调会触发完onPageScrollStateChanged 的 state 值为1时后面才触发回调 |
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override fun onPageScrolled( |
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position: Int, |
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positionOffset: Float, |
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positionOffsetPixels: Int |
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) { |
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currentPosition = position |
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if (currentState == 1) { |
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//手指按下滑动坐标记录 |
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scrolledPixList.add(positionOffsetPixels) |
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} |
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} |
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// 滚动状态改变回调，state的值分别有0，1，2 ; |
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// 0为ViewPager所有事件(1,2)已结束触发 |
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// 1为在viewPager里按下并滑动触发多次 |
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// 2是手指抬起触发 |
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override fun onPageScrollStateChanged(state: Int) { |
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currentState = state |
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if (state == 0) { |
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if (currentPosition == oldPosition) { |
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when (currentPosition) { |
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0 -> { |
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if (scrolledPixList.size > 1 && scrolledPixList.last() == 0 || scrolledPixList.last() - scrolledPixList[0] > 0) { |
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//有可能出现滑到一半放弃的情况也是可以出现currentPosition == oldPositon=0，则先判断是否是往右滑时放弃 |
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return |
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} |
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//若还有上一个bottom fragment页面则切换 |
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mainActivity.viewPager.currentItem.takeIf { it > 0 } |
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?.also { mainActivity.viewPager.setCurrentItem(it - 1, true) } |
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} |
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(viewPagerBookshelf.adapter as FragmentStateAdapter).itemCount - 1 -> { |
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//若还有下一个bottom fragment页面则切换 |
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mainActivity.viewPager.currentItem.takeIf { it < mainActivity.viewPager.adapter!!.itemCount - 1 } |
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?.also { mainActivity.viewPager.setCurrentItem(it + 1, true) } |
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} |
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} |
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} |
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oldPosition = currentPosition |
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scrolledPixList.clear()//清空滑动记录 |
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} |
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} |
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}) |
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tabLayout.setupWithViewPager(binding.viewPagerBookshelf) |
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binding.viewPagerBookshelf.offscreenPageLimit = 1 |
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adapter = TabFragmentPageAdapter(childFragmentManager) |
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binding.viewPagerBookshelf.adapter = adapter |
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} |
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private fun initBookGroupData() { |
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@ -199,7 +141,7 @@ class BookshelfFragment : VMBaseFragment<BookshelfViewModel>(R.layout.fragment_b |
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if (data != bookGroups) { |
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bookGroups.clear() |
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bookGroups.addAll(data) |
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binding.viewPagerBookshelf.adapter?.notifyDataSetChanged() |
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adapter.notifyDataSetChanged() |
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selectLastTab() |
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} |
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} |
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@ -309,21 +251,29 @@ class BookshelfFragment : VMBaseFragment<BookshelfViewModel>(R.layout.fragment_b |
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} |
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} |
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private inner class TabFragmentPageAdapter : |
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FragmentStateAdapter(this) { |
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private inner class TabFragmentPageAdapter(fm: FragmentManager) : |
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FragmentStatePagerAdapter(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) { |
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override fun getPageTitle(position: Int): CharSequence { |
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return bookGroups[position].groupName |
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} |
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override fun getItemPosition(`object`: Any): Int { |
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return POSITION_NONE |
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} |
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override fun getItemId(position: Int): Long { |
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override fun getItem(position: Int): Fragment { |
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val group = bookGroups[position] |
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return group.groupId |
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return BooksFragment.newInstance(position, group.groupId) |
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} |
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override fun getItemCount(): Int { |
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override fun getCount(): Int { |
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return bookGroups.size |
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} |
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override fun createFragment(position: Int): Fragment { |
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override fun instantiateItem(container: ViewGroup, position: Int): Any { |
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val fragment = super.instantiateItem(container, position) as BooksFragment |
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val group = bookGroups[position] |
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val fragment = BooksFragment.newInstance(position, group.groupId) |
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fragmentMap[group.groupId] = fragment |
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return fragment |
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} |
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gedoor
4 years ago