fix #44, show an optional grid on the monthly view if selected so

app/src/main/kotlin/com/simplemobiletools/calendar/activities/SettingsActivity.kt

@@ -52,6 +52,7 @@ class SettingsActivity : SimpleActivity() {
         setupDeleteAllEvents()
         setupReplaceDescription()
         setupWeekNumbers()
+        setupShowGrid()
         setupWeeklyStart()
         setupWeeklyEnd()
         setupVibrate()
@@ -274,6 +275,14 @@ class SettingsActivity : SimpleActivity() {
         }
     }
 
+    private fun setupShowGrid() {
+        settings_show_grid.isChecked = config.showGrid
+        settings_show_grid_holder.setOnClickListener {
+            settings_show_grid.toggle()
+            config.showGrid = settings_show_grid.isChecked
+        }
+    }
+
     private fun setupReminderSound() {
         settings_reminder_sound.text = config.reminderSoundTitle
 

app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Config.kt

@@ -85,6 +85,10 @@ class Config(context: Context) : BaseConfig(context) {
         get() = prefs.getBoolean(REPLACE_DESCRIPTION, false)
         set(replaceDescription) = prefs.edit().putBoolean(REPLACE_DESCRIPTION, replaceDescription).apply()
 
+    var showGrid: Boolean
+        get() = prefs.getBoolean(SHOW_GRID, false)
+        set(showGrid) = prefs.edit().putBoolean(SHOW_GRID, showGrid).apply()
+
     fun getSyncedCalendarIdsAsList() = caldavSyncedCalendarIDs.split(",").filter { it.trim().isNotEmpty() } as ArrayList<String>
 
     fun addDisplayEventType(type: String) {

app/src/main/kotlin/com/simplemobiletools/calendar/helpers/Constants.kt

@@ -50,6 +50,7 @@ const val CALDAV_SYNCED_CALENDAR_IDS = "caldav_synced_calendar_ids"
 const val LAST_USED_CALDAV_CALENDAR = "last_used_caldav_calendar"
 const val DISPLAY_PAST_EVENTS = "display_past_events"
 const val REPLACE_DESCRIPTION = "replace_description"
+const val SHOW_GRID = "show_grid"
 
 // repeat_rule for monthly repetition
 const val REPEAT_MONTH_SAME_DAY = 1                   // ie 25th every month

app/src/main/kotlin/com/simplemobiletools/calendar/views/MonthView.kt

@@ -31,6 +31,7 @@ class MonthView(context: Context, attrs: AttributeSet, defStyle: Int) : View(con
 
     private var paint: Paint
     private var eventTitlePaint: TextPaint
+    private var gridPaint: Paint
     private var dayWidth = 0f
     private var dayHeight = 0f
     private var primaryColor = 0
@@ -65,6 +66,10 @@ class MonthView(context: Context, attrs: AttributeSet, defStyle: Int) : View(con
             textAlign = Paint.Align.CENTER
         }
 
+        gridPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
+            color = textColor.adjustAlpha(LOW_ALPHA)
+        }
+
         val smallerTextSize = resources.getDimensionPixelSize(R.dimen.smaller_text_size)
         eventTitleHeight = smallerTextSize
         eventTitlePaint = TextPaint(Paint.ANTI_ALIAS_FLAG).apply {
@@ -112,6 +117,10 @@ class MonthView(context: Context, attrs: AttributeSet, defStyle: Int) : View(con
         dayVerticalOffsets.clear()
         measureDaySize(canvas)
 
+        if (context.config.showGrid) {
+            drawGrid(canvas)
+        }
+
         addWeekDayLetters(canvas)
         if (showWeekNumbers) {
             addWeekNumbers(canvas)
@@ -141,6 +150,17 @@ class MonthView(context: Context, attrs: AttributeSet, defStyle: Int) : View(con
         drawEvents(canvas)
     }
 
+    private fun drawGrid(canvas: Canvas) {
+        for (i in 0..6) {
+            canvas.drawLine(i * dayWidth, 0f, i * dayWidth, canvas.height.toFloat(), gridPaint)
+        }
+
+        canvas.drawLine(0f, 0f, canvas.width.toFloat(), 0f, gridPaint)
+        for (i in 0..5) {
+            canvas.drawLine(0f, i * dayHeight + weekDaysLetterHeight, canvas.width.toFloat(), i * dayHeight + weekDaysLetterHeight, gridPaint)
+        }
+    }
+
     private fun addWeekDayLetters(canvas: Canvas) {
         for (i in 0..6) {
             val xPos = horizontalOffset + (i + 1) * dayWidth - dayWidth / 2
@@ -148,7 +168,7 @@ class MonthView(context: Context, attrs: AttributeSet, defStyle: Int) : View(con
             if (i == currDayOfWeek) {
                 weekDayLetterPaint = getColoredPaint(primaryColor)
             }
-            canvas.drawText(dayLetters[i], xPos, weekDaysLetterHeight / 2f, weekDayLetterPaint)
+            canvas.drawText(dayLetters[i], xPos, weekDaysLetterHeight * 0.7f, weekDayLetterPaint)
         }
     }
 

app/src/main/res/layout/activity_settings.xml

@@ -494,6 +494,29 @@
 
         </RelativeLayout>
 
+        <RelativeLayout
+            android:id="@+id/settings_show_grid_holder"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/medium_margin"
+            android:background="?attr/selectableItemBackground"
+            android:paddingBottom="@dimen/activity_margin"
+            android:paddingLeft="@dimen/normal_margin"
+            android:paddingRight="@dimen/normal_margin"
+            android:paddingTop="@dimen/activity_margin">
+
+            <com.simplemobiletools.commons.views.MySwitchCompat
+                android:id="@+id/settings_show_grid"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:background="@null"
+                android:clickable="false"
+                android:paddingLeft="@dimen/medium_margin"
+                android:paddingStart="@dimen/medium_margin"
+                android:text="@string/show_a_grid"/>
+
+        </RelativeLayout>
+
         <View
             android:id="@+id/events_list_view_divider"
             android:layout_width="match_parent"