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| class YVPDotIndicator : LinearLayout {
private var mStartPos: Float = 0.0F
private var mWidthOffset: Int = 0
private var mPaint: Paint? = null
private var mIndicatorColor = Color.parseColor("#FFFFFF")
private var mIndicatorRadius = 2
private var mVp: ViewPager? = null
private var pageListener = InterPageChangeListener()
private var mTabCount: Int? = 0
private var mTabWidth: Float? = 0.0F
private val defaultLayoutParams = LinearLayout.LayoutParams(0, LayoutParams.MATCH_PARENT, 1.0f)
constructor(context: Context, attrs: AttributeSet) : this(context, attrs, 0)
constructor(context: Context, attrs: AttributeSet, defStyle: Int) : super(context, attrs, defStyle) {
setWillNotDraw(false)
val dm = resources.displayMetrics
val a = context.theme.obtainStyledAttributes(attrs, R.styleable.YVPDotIndicator, defStyle, 0)
mIndicatorRadius = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, mIndicatorRadius.toFloat(), dm).toInt()
mIndicatorColor = a.getColor(R.styleable.YVPDotIndicator_y_indicator_color, Color.parseColor("#FFFFFF"))
mIndicatorRadius = a.getDimensionPixelSize(R.styleable.YVPDotIndicator_y_indicator_radius, 2)
a.recycle()
initPaint()
}
fun setViewPager(vp: ViewPager) {
mVp = vp
if (vp.adapter == null) {
throw IllegalArgumentException()
}
notifyDataSetChanged()
mVp?.addOnPageChangeListener(pageListener)
}
fun notifyDataSetChanged() {
this.removeAllViews()
mTabCount = mVp?.adapter?.count
for (i in 0..mTabCount?.let { it - 1 } as Int) {
addTextTab(i, mVp?.adapter?.getPageTitle(i).toString())
}
}
fun addTextTab(position: Int, title: String) {
var tab = TextView(context)
tab.text = title
tab.gravity = Gravity.CENTER
tab.setSingleLine()
tab.isFocusable = true
tab.setOnClickListener { mVp?.currentItem = position }
this.addView(tab, position, defaultLayoutParams)
}
private fun initPaint() {
mPaint = Paint()
mPaint?.color = mIndicatorColor
mPaint?.isAntiAlias = true
mPaint?.style = Paint.Style.FILL
}
override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
super.onSizeChanged(w, h, oldw, oldh)
mTabWidth = (w / childCount).toFloat()
mStartPos = mTabWidth?.let { it/2 } as Float
}
override fun dispatchDraw(canvas: Canvas?) {
canvas?.save()
canvas?.translate(0.0F, height.toFloat())
canvas?.drawCircle(mStartPos + mWidthOffset, -mIndicatorRadius.toFloat(), mIndicatorRadius.toFloat(), mPaint)
canvas?.restore()
super.dispatchDraw(canvas)
}
inner class InterPageChangeListener: ViewPager.OnPageChangeListener {
override fun onPageScrollStateChanged(state: Int) {
}
override fun onPageSelected(position: Int) {
}
override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {
val tabWidth = screenWidth / childCount
mWidthOffset = (tabWidth * position + tabWidth * positionOffset).toInt()
invalidate()
}
}
private val screenWidth: Int
get() {
val windowManager = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager
val displayMetrics = DisplayMetrics()
windowManager.defaultDisplay.getMetrics(displayMetrics)
return displayMetrics.widthPixels
}
}
|
