Implemented button to change dates for an event to reflect the academic quarter

app/src/main/java/com/denizk0461/studip/data/Misc.kt

@@ -1,7 +1,9 @@
 package com.denizk0461.studip.data
 
+import android.content.Context
 import android.content.res.Resources
 import android.util.TypedValue
+import android.widget.Toast
 import androidx.annotation.AttrRes
 import com.denizk0461.studip.R
 
@@ -30,24 +32,52 @@ fun Resources.Theme.getThemedColor(@AttrRes id: Int): Int = TypedValue().also {
     resolveAttribute(id, value, true)
 }.data
 
-object Misc {
+/**
+ * Present the user with a toast.
+ *
+ * @param text  text to display
+ */
+fun showToast(context: Context, text: String) {
+    Toast.makeText(context, text, Toast.LENGTH_SHORT).show()
+}
 
-//    private val timeslotAcademicQuarter = mapOf(
-//        "6:00" to "6:15",
-//        "8:00" to "7:45",
-//        "8:00" to "8:15",
-//        "10:00" to "9:45",
-//        "10:00" to "10:15",
-//        "12:00" to "11:45",
-//        "12:00" to "12:15",
-//        "14:00" to "13:45",
-//        "14:00" to "14:15",
-//        "16:00" to "15:45",
-//        "16:00" to "16:15",
-//        "18:00" to "17:45",
-//        "18:00" to "18:15",
-//        "20:00" to "19:45",
-//        "20:00" to "20:15",
-//        "22:00" to "21:45",
-//    )
-}
+/**
+ * Provides a conversion method between a timestamp ending in a full hour, and one with an academic
+ * quarter applied.
+ */
+val timeslotsAcademicQuarter = listOf(
+    "4:00",
+    "6:00",
+    "8:00",
+    "10:00",
+    "12:00",
+    "14:00",
+    "16:00",
+    "18:00",
+    "20:00",
+    "22:00",
+)
+
+val timeslotsAcademicQuarterStart = mapOf(
+    "4:00" to "4:15",
+    "6:00" to "6:15",
+    "8:00" to "8:15",
+    "10:00" to "10:15",
+    "12:00" to "12:15",
+    "14:00" to "14:15",
+    "16:00" to "16:15",
+    "18:00" to "18:15",
+    "20:00" to "20:15",
+)
+
+val timeslotsAcademicQuarterEnd = mapOf(
+    "6:00" to "5:45",
+    "8:00" to "7:45",
+    "10:00" to "9:45",
+    "12:00" to "11:45",
+    "14:00" to "13:45",
+    "16:00" to "15:45",
+    "18:00" to "17:45",
+    "20:00" to "19:45",
+    "22:00" to "21:45",
+)

app/src/main/java/com/denizk0461/studip/db/AppRepository.kt

@@ -197,7 +197,8 @@ class AppRepository(app: Application) {
      * @param pref  preference to retrieve
      * @return      whether the user set this preference
      */
-    fun getBooleanPreference(pref: SettingsPreferences): Boolean = prefs.getBoolean(pref.key, false)
+    fun getBooleanPreference(pref: SettingsPreferences, defaultValue: Boolean = false): Boolean =
+        prefs.getBoolean(pref.key, defaultValue)
 
     /**
      * Retrieves ta user-set integer preference.

app/src/main/java/com/denizk0461/studip/sheet/DevCodeSheet.kt

@@ -7,6 +7,7 @@ import android.util.Base64
 import android.view.View
 import android.widget.Toast
 import com.denizk0461.studip.R
+import com.denizk0461.studip.data.showToast
 import com.denizk0461.studip.data.viewBinding
 import com.denizk0461.studip.databinding.SheetDevCodeBinding
 import java.nio.charset.StandardCharsets
@@ -60,43 +61,34 @@ class DevCodeSheet(
                 "QkJVT0s/".d() -> launchLink("aHR0cHM6Ly95b3V0dS5iZS90Rm1PMm1TY0tHNA==".d())
                 "NEVENT" -> { // nuke events
                     nukeEvents()
-                    showToast("Nuked all events")
+                    showToast(context, "Nuked all events")
                 }
                 "NCANTE" -> { // nuke canteens
                     nukeOfferCanteens()
-                    showToast("Nuked all canteens")
+                    showToast(context, "Nuked all canteens")
                 }
                 "NDATES" -> { // nuke dates
                     nukeOfferDates()
-                    showToast("Nuked all dates")
+                    showToast(context, "Nuked all dates")
                 }
                 "NCATEG" -> { // nuke categories
                     nukeOfferCategories()
-                    showToast("Nuked all categories")
+                    showToast(context, "Nuked all categories")
                 }
                 "NITEMS" -> { // nuke items
                     nukeOfferItems()
-                    showToast("Nuked all items")
+                    showToast(context, "Nuked all items")
                 }
                 "NEVERY" -> { // nuke everything
                     nukeEverything()
-                    showToast("Nuked everything")
+                    showToast(context, "Nuked everything")
                 }
-                else -> showToast("code is invalid")
+                else -> showToast(context, "code is invalid")
             }
             dismiss()
         }
     }
 
-    /**
-     * Present the user with a toast.
-     *
-     * @param text  text to display
-     */
-    private fun showToast(text: String) {
-        Toast.makeText(context, text, Toast.LENGTH_SHORT).show()
-    }
-
     /**
      * Launches a web link.
      *
@@ -104,7 +96,7 @@ class DevCodeSheet(
      */
     private fun launchLink(link: String) {
         // Let the user know they accomplished something with their life
-        showToast("✨")
+        showToast(context, "✨")
 
         // Give the user a slight dopamine boost
         startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(link)))

app/src/main/java/com/denizk0461/studip/sheet/ScheduleUpdateSheet.kt

@@ -1,11 +1,17 @@
 package com.denizk0461.studip.sheet
 
 import android.os.Bundle
+import android.os.Handler
 import android.util.Log
 import android.view.View
 import androidx.fragment.app.FragmentActivity
+import androidx.transition.TransitionManager
 import com.denizk0461.studip.R
 import com.denizk0461.studip.data.parseToMinutes
+import com.denizk0461.studip.data.showToast
+import com.denizk0461.studip.data.timeslotsAcademicQuarter
+import com.denizk0461.studip.data.timeslotsAcademicQuarterEnd
+import com.denizk0461.studip.data.timeslotsAcademicQuarterStart
 import com.denizk0461.studip.data.viewBinding
 import com.denizk0461.studip.databinding.SheetScheduleUpdateBinding
 import com.denizk0461.studip.dialog.TimePickerFragment
@@ -40,6 +46,34 @@ class ScheduleUpdateSheet(
         binding.editTextLecturers.setText(event.lecturer)
         binding.editTextRoom.setText(event.room)
 
+        // Show academic quarter suggestion if it is applicable
+        binding.buttonAcademicQuarter.visibility = if (
+            timeslotsAcademicQuarter.contains(timeslotStart) &&
+            timeslotsAcademicQuarter.contains(timeslotEnd)
+        ) {
+            binding.buttonAcademicQuarter.setOnClickListener {
+                try {
+                    val newStart = timeslotsAcademicQuarterStart[timeslotStart]
+                        ?: throw NullPointerException()
+                    val newEnd = timeslotsAcademicQuarterEnd[timeslotEnd]
+                        ?: throw NullPointerException()
+
+                    timeslotStart = newStart
+                    binding.buttonTimeStart.text = newStart
+                    timeslotEnd = newEnd
+                    binding.buttonTimeEnd.text = newEnd
+
+                    TransitionManager.beginDelayedTransition(binding.sheet)
+                    binding.buttonAcademicQuarter.visibility = View.GONE
+                } catch (e: NullPointerException) {
+                    showToast(context, getString(R.string.sheet_schedule_update_hint_quarter_error))
+                }
+            }
+            View.VISIBLE
+        } else {
+            View.GONE
+        }
+
         // Prepare timestamp buttons
         binding.buttonTimeStart.text = timeslotStart
         binding.buttonTimeStart.setOnClickListener {

app/src/main/java/com/denizk0461/studip/viewmodel/CanteenViewModel.kt

@@ -70,7 +70,7 @@ class CanteenViewModel(app: Application) : AppViewModel(app) {
      * This value determines whether the user wants to have allergens marked.
      */
     val preferenceAllergen: Boolean
-        get() = repo.getBooleanPreference(SettingsPreferences.ALLERGEN)
+        get() = repo.getBooleanPreference(SettingsPreferences.ALLERGEN, defaultValue = true)
 
     var preferenceCanteen: Int
         get() = repo.getIntPreference(SettingsPreferences.CANTEEN)

app/src/main/java/com/denizk0461/studip/viewmodel/SettingsViewModel.kt

@@ -60,7 +60,7 @@ class SettingsViewModel(app: Application) : AppViewModel(app) {
      * This value determines whether the user wants to have allergens marked.
      */
     var preferenceAllergen: Boolean
-        get() = repo.getBooleanPreference(SettingsPreferences.ALLERGEN)
+        get() = repo.getBooleanPreference(SettingsPreferences.ALLERGEN, defaultValue = true)
         set(newValue) { repo.setPreference(SettingsPreferences.ALLERGEN, newValue) }
 
     /**