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我使用 itemtouchhelper SimpleCallback 位图和画布制作了滑动按钮。 我有两个问题。
iamdoing
这就是我正在做的，
我想做这样的， whatiwanttodo
我的代码是 MemoSwipeHelper.kt
package com.softsquared.template.kotlin.src.main.today
import androID.annotation.Suppresslint
import androID.content.Context
import androID.graphics.Canvas
import androID.graphics.Point
import androID.graphics.Rect
import androID.graphics.RectF
import androID.vIEw.GestureDetector
import androID.vIEw.MotionEvent
import androID.vIEw.VIEw
import androIDx.recyclervIEw.Widget.itemtouchhelper
import androIDx.recyclervIEw.Widget.RecyclerVIEw
import com.softsquared.template.kotlin.src.main.today.adapter.MemoAdapter
import java.util.*
import kotlin.collections.ArrayList
abstract class MemoSwipeHelper(adapter: MemoAdapter,context:Context,private val recyclerVIEw:RecyclerVIEw,internal var buttonWIDth:Int)
:itemtouchhelper.SimpleCallback(itemtouchhelper.UP.or(itemtouchhelper.DOWN),itemtouchhelper.left) {
val dragAdapter = adapter
private var buttonList:MutableList<Swipebutton> ?= null
lateinit var gestureDetector:GestureDetector
var swipeposition = -1
var swipeThreshold = 0.5f
val buttonBuffer:MutableMap<Int,MutableList<Swipebutton>> = mutableMapOf()
lateinit var removeQueue:linkedList<Int>
abstract fun instantiateMybutton(vIEwHolder:RecyclerVIEw.VIEwHolder,buffer:MutableList<Swipebutton>)
private val gestureListener = object:GestureDetector.SimpleOnGestureListener(){
overrIDe fun onSingleTapUp(e: MotionEvent?): Boolean {
for(button in buttonList!!){
if(button.onClick(e!!.x,e!!.y))
break
}
return true
}
}
@Suppresslint("ClickableVIEwAccessibility")
private val ontouchListener = VIEw.OntouchListener { _,motionEvent ->
if(swipeposition < 0) return@OntouchListener false
val point = Point(motionEvent.rawX.toInt(),motionEvent.rawY.toInt())
val @R_403_3837@Holder = recyclerVIEw.findVIEwHolderForAdapterposition(swipeposition)
val swipedItem = @R_403_3837@Holder!!.itemVIEw
val rect = Rect()
swipedItem.getGlobalVisibleRect(rect)
if(motionEvent.action == MotionEvent.ACTION_DOWN ||
motionEvent.action == MotionEvent.ACTION_MOVE ||
motionEvent.action == MotionEvent.ACTION_UP){
if(rect.top < point.y && rect.bottom > point.y)
gestureDetector.ontouchEvent(motionEvent)
else {
removeQueue.add(swipeposition)
swipeposition = -1
recoverSwipeItem()
}
}
false
}
@Synchronized
private fun recoverSwipeItem() {
while(!removeQueue.isEmpty()) {
val pos = removeQueue.poll()!!.toInt()
if(pos > -1){
recyclerVIEw.adapter!!.notifyItemChanged(pos)
}
}
}
init{
this.buttonList = ArrayList()
this.gestureDetector = GestureDetector(context,gestureListener)
this.recyclerVIEw.setontouchListener(ontouchListener)
this.removeQueue = IntlinkedList()
attachSwipe()
}
private fun attachSwipe() {
val itemtouchhelper = itemtouchhelper(this)
itemtouchhelper.attachToRecyclerVIEw(recyclerVIEw)
}
class IntlinkedList : linkedList<Int>() {
overrIDe fun contains(element: Int): Boolean {
return false
}
overrIDe fun lastIndexOf(element: Int): Int {
return element
}
overrIDe fun remove(element: Int): Boolean {
return false
}
overrIDe fun indexOf(element: Int): Int {
return element
}
overrIDe fun add(element: Int): Boolean {
return if(contains(element))
false
else super.add(element)
}
}
overrIDe fun onMove(
recyclerVIEw: RecyclerVIEw,vIEwHolder: RecyclerVIEw.VIEwHolder,target: RecyclerVIEw.VIEwHolder
): Boolean {
dragAdapter.swAPItems(vIEwHolder.adapterposition,target.adapterposition)
return true
}
overrIDe fun onSwiped(vIEwHolder: RecyclerVIEw.VIEwHolder,direction: Int) {
val pos= vIEwHolder.adapterposition
if(swipeposition != pos)removeQueue.add(swipeposition)
swipeposition = pos
if(buttonBuffer.containsKey(swipeposition))buttonList = buttonBuffer[swipeposition]
else buttonList!!.clear()
buttonBuffer.clear()
swipeThreshold = 0.5f * buttonList!!.size.tofloat() * buttonWIDth.tofloat()
recoverSwipeItem()
}
overrIDe fun getSwipeThreshold(vIEwHolder: RecyclerVIEw.VIEwHolder): float {
return swipeThreshold
}
overrIDe fun getSwipeEscapeVeLocity(defaultValue: float): float {
return 0.1f * defaultValue
}
overrIDe fun getSwipeVeLocityThreshold(defaultValue: float): float {
return 5.0f*defaultValue
}
overrIDe fun onChildDraw(
c: Canvas,recyclerVIEw: RecyclerVIEw,dX: float,dY: float,actionState: Int,isCurrentlyActive: Boolean
) {
val pos = vIEwHolder.adapterposition
var translationX = dX
var itemVIEw = vIEwHolder.itemVIEw
if(pos<0){
swipeposition = pos
return
}
if(actionState == itemtouchhelper.ACTION_STATE_SWIPE)
{
if(dX <0){
var buffer : MutableList<Swipebutton> = ArrayList()
if(!buttonBuffer.containsKey(pos)){
instantiateMybutton(vIEwHolder,buffer)
buttonBuffer[pos] = buffer
}else{
buffer = buttonBuffer[pos]!!
}
translationX = dX * buffer.size.tofloat() * buttonWIDth.tofloat() / itemVIEw.wIDth
drawbutton(c,itemVIEw,buffer,pos,translationX)
}
}
super.onChildDraw(c,recyclerVIEw,vIEwHolder,translationX,dY,actionState,isCurrentlyActive)
}
private fun drawbutton(c: Canvas,itemVIEw: VIEw,buffer: MutableList<Swipebutton>,pos: Int,translationX: float) {
var right = itemVIEw.right.tofloat()
val dbuttonWIDth = -1 * translationX/buffer.size
for(button in buffer){
val left = right - dbuttonWIDth
button.onDraw(c,RectF(left,itemVIEw.top.tofloat(),right,itemVIEw.bottom.tofloat()),pos)
right = left
}
}
}
Swipebutton.kt
package com.softsquared.template.kotlin.src.main.today
import androID.content.Context
import androID.content.res.Resources
import androID.graphics.*
import androID.graphics.drawable.BitmapDrawable
import androID.graphics.drawable.Drawable
import androIDx.core.content.ContextCompat
class Swipebutton
(private val context: Context,private val text:String,private val textSize:Int,private val imageResID:Int,private val color:Int,private val Listener: SwipebuttonClickListener) {
private val resources:Resources
private var pos:Int = 0
private var clickRegion: RectF?=null
init{
resources = context.resources
}
fun onClick(x:float,y:float):Boolean{
if(clickRegion != null && clickRegion !!.contains(x,y))
{
Listener.onClick(pos)
return true
}
return false
}
fun onDraw(c: Canvas,rectF:RectF,pos:Int){
val p = Paint()
p.color = color
c.drawRect(rectF,p)
p.color = color.WHITE
p.textSize = textSize.tofloat()
val r = Rect()
val cHeight = rectF.height()
val cWIDth = rectF.wIDth()
p.textAlign = Paint.Align.left
p.getTextBounds(text,text.length,r)
var x = 0f
var y = 0f
if(imageResID == 0){
x = cWIDth/2f-r.wIDth()/2f-r.left.tofloat()
y = cHeight/2f +r.height()/2f-r.bottom.tofloat()
c.drawText(text,rectF.left+x,rectF.top+y,p)
}else{
val d = ContextCompat.getDrawable(context,imageResID)
val bitmap = drawabletoBitmap(d)
c.drawBitmap(bitmap,(rectF.left+rectF.right)/2,(rectF.top+rectF.bottom)/2,p)
}
clickRegion = rectF
this.pos = pos
}
private fun drawabletoBitmap(d: Drawable?): Bitmap {
if(d is BitmapDrawable)return d.bitmap
val bitmap = Bitmap.createBitmap(d!!.intrinsicWIDth,d.intrinsicHeight,Bitmap.Config.ARGB_8888)
// val bitmap = Bitmap.createBitmap(25,25,Bitmap.Config.ARGB_8888)
val canvas = Canvas(bitmap)
// d!!.setBounds(0,canvas.wIDth,canvas.height)
d!!.setBounds(0,50,50)
d!!.draw(canvas)
return bitmap
}
}
我的片段代码是
class TodayFragment :
BaseFragment<FragmentTodayBinding>(FragmentTodayBinding::bind,R.layout.fragment_today),TodayVIEw
{
val memoList:ArrayList<MemoItem> = arraylistof()
lateinit var todayMemoAdapter:MemoAdapter
overrIDe fun onVIEwCreated(vIEw: VIEw,savedInstanceState: Bundle?) {
super.onVIEwCreated(vIEw,savedInstanceState)
showLoadingDialog(context!!)
TodayService(this).onGetScheduleItems()
// adapter
val mLayoutManager = linearlayoutmanager(context)
todayMemoAdapter = MemoAdapter(memoList,context!!){
val scheduleDetailDialog = ScheduleDetailDialog(context!!)
scheduleDetailDialog.setonModifyBtnClickedListener {
(activity as MainActivity).showBottomAddScheduleSheetDialog()
}
scheduleDetailDialog.start(it)
}
binding.todayRecyclerVIEw.apply {
layoutManager = mLayoutManager
adapter = todayMemoAdapter
}
binding.todayImageNoItem.setonClickListener {
(activity as MainActivity).showBottomAddScheduleSheetDialog()
}
// swipe and drag
val swipe = object: MemoSwipeHelper(todayMemoAdapter,context!!,binding.todayRecyclerVIEw,200)
{
overrIDe fun instantiateMybutton(
vIEwHolder: RecyclerVIEw.VIEwHolder,buffer: MutableList<Swipebutton>
) {
// add button
buffer.add(Swipebutton(context!!,"Delete",30,R.drawable.schedule_delete,color.parsecolor("#32363C"),object: SwipebuttonClickListener {
overrIDe fun onClick(pos: Int) {
showCustomToast("delete $pos")
}
}
))
buffer.add(Swipebutton(context!!,"Share",R.drawable.schedule_share,color.parsecolor("#FFAE2A"),object: SwipebuttonClickListener {
overrIDe fun onClick(pos: Int) {
showCustomToast("share $pos")
}
}
))
}
}
}
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