上下滑动的日历筛选控件，适合用在对话框dialog中
Animation.gif
github地址：https://github.com/tianstardust/CalendarView/tree/dev
设计思路：
1.因为要上下滑动，推荐使用Viewpager2，为了追求滑动效果，这边使用了RecycleView
- 先绘制自定义月视图CalendarView，再用月视图 制作Item
3.制作一个静态类存储获取的点击范围
月视图代码如下：
package com.example.calendar.calendar
import android.content.Context
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Paint
import android.util.AttributeSet
import android.view.MotionEvent
import android.view.View
import android.widget.Toast
import com.example.calendar.R
class CalendarView : View, View.OnClickListener {
private val mWeekTitle = Paint()
private val mCurMonthTextPaint = Paint()
private val mSelectedPaint = Paint()
private val mSelectedTextPaint = Paint()
private val mSelectedStartEndPaint = Paint()
//文字默认高度16dp
private var mTextSize = CalendarUtils.spToPx(context, 16)
//每个Item 默认高度为56
private var mItemHeight = CalendarUtils.dipToPx(context, 56)
private var mBaseLineHeight = 0f
private var mItemWidth = 0
private var mLineCount = 0
private var mRadius = 0
private val weekArray = context.resources.getStringArray(R.array.week_start_sun)
private var calendarList = ArrayList()
constructor(context: Context?) : super(context)
constructor(context: Context?, attrs: AttributeSet?) : super(context, attrs) {
initPaint()
obtainAttrs()
updateParameter()
setOnClickListener(this)
}
private fun updateParameter() {
val fontMetrics = mCurMonthTextPaint.fontMetrics
mBaseLineHeight =
(fontMetrics.bottom - fontMetrics.top) / 2 - fontMetrics.descent + mItemHeight / 2
}
/**
* 获取控件属性
*/
private fun obtainAttrs() {
}
fun initYearMonth(yearMonthEntity: YearMonthEntity, weekStartWith: Int) {
//获取当月的集合
calendarList = CalendarUtils.getCurMonthCalendar(yearMonthEntity, weekStartWith)
mLineCount = calendarList.size / 7
requestLayout()
invalidate()
}
override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
if (mLineCount != 0) {
val height =
MeasureSpec.makeMeasureSpec((mLineCount + 1) * mItemHeight, MeasureSpec.EXACTLY)
super.onMeasure(widthMeasureSpec, height)
} else {
super.onMeasure(widthMeasureSpec, heightMeasureSpec)
}
}
override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
super.onSizeChanged(w, h, oldw, oldh)
mItemWidth = (width - paddingLeft - paddingRight) / 7
mRadius = Math.min(mItemHeight, mItemWidth) * 2 / 5
}
override fun onDraw(canvas: Canvas?) {
var position = 0
for (i in 0..mLineCount) { //行数 height
for (j in 0 until 7) { //列数 width
if (i == 0) {
drawWeekText(canvas, j)
continue
}
val calendarEntity = calendarList[position]
if (!calendarEntity.isCurMonthDay) {
position++
continue
}
val x = mItemWidth * j + paddingLeft
val y = mItemHeight * i
val cx = mItemWidth / 2 + x
if (!RangeSelectedEntity.isSelected(calendarEntity) || RangeSelectedEntity.getSelectedMode(
calendarEntity
) == RangeSelectedEntity.Out_Range
) {
drawCurMonthText(canvas, calendarEntity, y, cx)
} else {
drawSelectedDay(canvas, calendarEntity, x, y, cx)
}
position++
}
}
}
/**
* 绘制选中区域
*/
private fun drawSelectedDay(
canvas: Canvas?,
calendarEntity: CalendarEntity,
x: Int,
y: Int,
cx: Int
) {
val baseLineY = y + mBaseLineHeight
when (RangeSelectedEntity.getSelectedMode(calendarEntity)) {
RangeSelectedEntity.Only_Start -> {
canvas?.drawCircle(
cx.toFloat(), (y + mItemHeight / 2).toFloat(),
mRadius.toFloat(), mSelectedPaint
)
// canvas?.drawText(
// calendarEntity.day.toString(), cx.toFloat(),
// baseLineY, mSelectedTextPaint
// )
canvas?.drawText(
"起始", cx.toFloat(),
baseLineY, mSelectedStartEndPaint
)
}
RangeSelectedEntity.Not_Only_Start -> {
val cy = y + mItemHeight / 2
canvas?.drawCircle(
cx.toFloat(), (y + mItemHeight / 2).toFloat(),
mRadius.toFloat(), mSelectedPaint
)
canvas?.drawRect(
cx.toFloat(),
(cy - mRadius).toFloat(), (x + mItemWidth).toFloat(),
(cy + mRadius).toFloat(), mSelectedPaint
)
// canvas?.drawText(
// calendarEntity.day.toString(), cx.toFloat(),
// baseLineY, mSelectedTextPaint
// )
canvas?.drawText(
"起始", cx.toFloat(),
baseLineY, mSelectedStartEndPaint
)
}
RangeSelectedEntity.In_Range -> {
val cy = y + mItemHeight / 2
canvas?.drawRect(
x.toFloat(), (cy - mRadius).toFloat(),
(x + mItemWidth).toFloat(), (cy + mRadius).toFloat(), mSelectedPaint
)
canvas?.drawText(
calendarEntity.day.toString(), cx.toFloat(),
baseLineY, mSelectedTextPaint
)
}
RangeSelectedEntity.In_END -> {
val cy = y + mItemHeight / 2
canvas?.drawCircle(
cx.toFloat(), (y + mItemHeight / 2).toFloat(),
mRadius.toFloat(), mSelectedPaint
)
canvas?.drawRect(
x.toFloat(),
(cy - mRadius).toFloat(), cx.toFloat(), (cy + mRadius).toFloat(), mSelectedPaint
)
// canvas?.drawText(
// calendarEntity.day.toString(), cx.toFloat(),
// baseLineY, mSelectedTextPaint
// )
canvas?.drawText(
"截止", cx.toFloat(),
baseLineY, mSelectedStartEndPaint
)
}
}
}
private fun drawCurMonthText(
canvas: Canvas?,
calendarEntity: CalendarEntity,
y: Int,
cx: Int
) {
val baseLineY = y + mBaseLineHeight
canvas?.drawText(
calendarEntity.day.toString(), cx.toFloat(),
baseLineY, mCurMonthTextPaint
)
}
private fun drawWeekText(canvas: Canvas?, index: Int) {
canvas?.drawText(
weekArray[index],
(mItemWidth / 2 + index * mItemWidth + paddingLeft).toFloat(),
mBaseLineHeight,
mWeekTitle
)
}
private fun initPaint() {
mWeekTitle.isAntiAlias = true
mWeekTitle.isFakeBoldText = true
mWeekTitle.color = Color.parseColor("#9E9E9E")
mWeekTitle.textAlign = Paint.Align.CENTER
mWeekTitle.textSize = mTextSize.toFloat()
mCurMonthTextPaint.isAntiAlias = true
mCurMonthTextPaint.isFakeBoldText = true
mCurMonthTextPaint.color = Color.parseColor("#000000")
mCurMonthTextPaint.textAlign = Paint.Align.CENTER
mCurMonthTextPaint.textSize = mTextSize.toFloat()
mSelectedPaint.isAntiAlias = true
mSelectedPaint.style = Paint.Style.FILL
mSelectedPaint.color = Color.parseColor("#FF4857BD")
mSelectedTextPaint.isAntiAlias = true
mSelectedTextPaint.isFakeBoldText = true
mSelectedTextPaint.color = Color.parseColor("#DEFFFFFF")
mSelectedTextPaint.textAlign = Paint.Align.CENTER
mSelectedTextPaint.textSize = mTextSize.toFloat()
mSelectedStartEndPaint.isAntiAlias = true
mSelectedStartEndPaint.color = Color.parseColor("#DEFFFFFF")
mSelectedStartEndPaint.textAlign = Paint.Align.CENTER
mSelectedStartEndPaint.textSize = mTextSize.toFloat()
}
var mX: Float = 0f
var mY: Float = 0f
var isClick = true
override fun onTouchEvent(event: MotionEvent?): Boolean {
if (event?.pointerCount!! > 1) return false
when (event.action) {
MotionEvent.ACTION_DOWN -> {
mX = event.x
mY = event.y
isClick = true
}
MotionEvent.ACTION_MOVE -> {
var mDy: Float
if (isClick) {
mDy = event.y - mY
isClick = Math.abs(mDy) < 50
}
}
MotionEvent.ACTION_UP -> {
mX = event.x
mY = event.y
}
}
return super.onTouchEvent(event)
}
override fun onClick(view: View?) {
if (!isClick) return
val selectedEntity = getSelectedEntity() ?: return
if (!selectedEntity.isCurMonthDay) return
RangeSelectedEntity.setSelectedCalendar(selectedEntity)
Toast.makeText(context, selectedEntity.toString(), Toast.LENGTH_SHORT).show()
invalidate()
}
private fun getSelectedEntity(): CalendarEntity? {
if (mItemWidth == 0 || mItemHeight == 0) return null
if (mX <= paddingLeft || mX >= width - paddingRight) return null
var row = ((mX - paddingLeft) / mItemWidth).toInt()
if (row >= 7) {
row = 6
}
if (mY - mItemHeight <= 0) return null
val kind = (mY / mItemHeight).toInt() - 1
val position = kind * 7 + row
if (position in 0 until calendarList.size)
return calendarList[position]
return null
}
}