Added bounce on Stopping calender event, will make it more graceful later

Author: kgoel

collapsiblecalendarview2/build.gradle

@@ -46,6 +46,7 @@ dependencies {
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation 'androidx.cardview:cardview:1.0.0'
 }
 repositories {
     mavenCentral()

collapsiblecalendarview2/src/main/java/com/shrikanthravi/collapsiblecalendarview/view/BounceAnimator.kt

@@ -0,0 +1,16 @@
+package com.shrikanthravi.collapsiblecalendarview.view
+
+class BounceAnimator(amplitude: Double, frequency: Double) : android.view.animation.Interpolator {
+    private var mAmplitude = 1.0
+    private var mFrequency = 10.0
+
+    init {
+        mAmplitude = amplitude
+        mFrequency = frequency
+    }
+
+    override fun getInterpolation(time: Float): Float {
+        return (-1.0 * Math.pow(Math.E, -time / mAmplitude) *
+                Math.cos(mFrequency * time) + 1).toFloat()
+    }
+}

collapsiblecalendarview2/src/main/java/com/shrikanthravi/collapsiblecalendarview/view/LockScrollView.kt

@@ -30,6 +30,7 @@ class LockScrollView : ScrollView {
         }
     }
 
+    @SuppressLint("ClickableViewAccessibility")
     override fun onTouchEvent(ev: MotionEvent): Boolean {
         super.onTouchEvent(ev)
         return true

collapsiblecalendarview2/src/main/java/com/shrikanthravi/collapsiblecalendarview/widget/CollapsibleCalendar.kt

@@ -12,6 +12,7 @@ import android.util.AttributeSet
 import android.view.View
 import android.view.ViewGroup
 import android.view.animation.Animation
+import android.view.animation.AnimationUtils
 import android.view.animation.Transformation
 import android.widget.LinearLayout
 import android.widget.TableLayout
@@ -21,6 +22,7 @@ import com.shrikanthravi.collapsiblecalendarview.R
 import com.shrikanthravi.collapsiblecalendarview.data.CalendarAdapter
 import com.shrikanthravi.collapsiblecalendarview.data.Day
 import com.shrikanthravi.collapsiblecalendarview.data.Event
+import com.shrikanthravi.collapsiblecalendarview.view.BounceAnimator
 import com.shrikanthravi.collapsiblecalendarview.view.ExpandIconView
 import java.text.DateFormatSymbols
 import java.text.SimpleDateFormat
@@ -30,10 +32,10 @@ import java.util.*
 class CollapsibleCalendar : UICalendar, View.OnClickListener {
     override fun changeToToday() {
         val calendar = Calendar.getInstance()
-        var calenderAdapter = CalendarAdapter(context, calendar);
+        val calenderAdapter = CalendarAdapter(context, calendar);
         calenderAdapter.mEventList = mAdapter!!.mEventList
         calenderAdapter.setFirstDayOfWeek(firstDayOfWeek)
-        var today = GregorianCalendar()
+        val today = GregorianCalendar()
         this.selectedItem = null
         this.selectedItemPosition = -1
         this.selectedDay = Day(today.get(Calendar.YEAR), today.get(Calendar.MONTH), today.get(Calendar.DAY_OF_MONTH))
@@ -254,9 +256,15 @@ class CollapsibleCalendar : UICalendar, View.OnClickListener {
     override fun reload() {
         mAdapter?.let { mAdapter ->
             mAdapter.refresh()
-
+            val calendar = Calendar.getInstance()
+            val tempDatePattern: String
+            if (calendar.get(Calendar.YEAR) != mAdapter.calendar.get(Calendar.YEAR)) {
+                tempDatePattern = "MMMM YYYY"
+            } else {
+                tempDatePattern = datePattern
+            }
             // reset UI
-            val dateFormat = SimpleDateFormat(datePattern, getCurrentLocale(context))
+            val dateFormat = SimpleDateFormat(tempDatePattern, getCurrentLocale(context))
             dateFormat.timeZone = mAdapter.calendar.timeZone
             mTxtTitle.text = dateFormat.format(mAdapter.calendar.time)
             mTableHead.removeAllViews()
@@ -297,6 +305,7 @@ class CollapsibleCalendar : UICalendar, View.OnClickListener {
                 params.let { params ->
                     if (params != null && (mAdapter.getItem(i).diff < params.prevDays || mAdapter.getItem(i).diff > params.nextDaysBlocked)) {
                         view.isClickable = false
+                        view.alpha = 0.3f
                     } else {
                         view.setOnClickListener { v -> onItemClicked(v, mAdapter.getItem(i)) }
                     }
@@ -364,27 +373,46 @@ class CollapsibleCalendar : UICalendar, View.OnClickListener {
 
     fun prevMonth() {
         val cal = mAdapter!!.calendar
-        if (cal.get(Calendar.MONTH) == cal.getActualMinimum(Calendar.MONTH)) {
-            cal.set(cal.get(Calendar.YEAR) - 1, cal.getActualMaximum(Calendar.MONTH), 1)
-        } else {
-            cal.set(Calendar.MONTH, cal.get(Calendar.MONTH) - 1)
-        }
-        reload()
-        if (mListener != null) {
-            mListener!!.onMonthChange()
+        params.let {
+            if (it != null && (Calendar.getInstance().get(Calendar.YEAR) * 12 + Calendar.getInstance().get(Calendar.MONTH) + it.prevDays / 30) > (cal.get(Calendar.YEAR) * 12 + cal.get(Calendar.MONTH))) {
+                val myAnim = AnimationUtils.loadAnimation(context, R.anim.bounce)
+                val interpolator = BounceAnimator(0.1, 10.0)
+                myAnim.setInterpolator(interpolator)
+                mLayoutRoot.startAnimation(myAnim)
+                return
+            }
+            if (cal.get(Calendar.MONTH) == cal.getActualMinimum(Calendar.MONTH)) {
+                cal.set(cal.get(Calendar.YEAR) - 1, cal.getActualMaximum(Calendar.MONTH), 1)
+            } else {
+                cal.set(Calendar.MONTH, cal.get(Calendar.MONTH) - 1)
+            }
+            reload()
+            if (mListener != null) {
+                mListener!!.onMonthChange()
+            }
         }
+
     }
 
     fun nextMonth() {
         val cal = mAdapter!!.calendar
-        if (cal.get(Calendar.MONTH) == cal.getActualMaximum(Calendar.MONTH)) {
-            cal.set(cal.get(Calendar.YEAR) + 1, cal.getActualMinimum(Calendar.MONTH), 1)
-        } else {
-            cal.set(Calendar.MONTH, cal.get(Calendar.MONTH) + 1)
-        }
-        reload()
-        if (mListener != null) {
-            mListener!!.onMonthChange()
+        params.let {
+            if (it != null && (Calendar.getInstance().get(Calendar.YEAR) * 12 + Calendar.getInstance().get(Calendar.MONTH) + it.nextDaysBlocked / 30) < (cal.get(Calendar.YEAR) * 12 + cal.get(Calendar.MONTH))) {
+                val myAnim = AnimationUtils.loadAnimation(context, R.anim.bounce)
+                val interpolator = BounceAnimator(0.1, 10.0)
+                myAnim.setInterpolator(interpolator)
+                this.startAnimation(myAnim)
+                return
+            }
+            if (cal.get(Calendar.MONTH) == cal.getActualMaximum(Calendar.MONTH)) {
+                cal.set(cal.get(Calendar.YEAR) + 1, cal.getActualMinimum(Calendar.MONTH), 1)
+            } else {
+                cal.set(Calendar.MONTH, cal.get(Calendar.MONTH) + 1)
+            }
+            reload()
+            if (mListener != null) {
+                mListener!!.onMonthChange()
+            }
         }
     }
 

collapsiblecalendarview2/src/main/res/anim/bounce.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+    android:fillAfter="true"
+    android:interpolator="@android:anim/bounce_interpolator">
+
+    <translate
+        android:duration="300"
+        android:fromXDelta="100%p"
+        android:toXDelta="0%p" />
+</set>