HistoryChart: Fix HistoryEditorDialog

android/uhabits-android/src/main/java/org/isoron/platform/gui/AndroidCanvas.kt

@@ -177,4 +177,8 @@ class AndroidCanvas : Canvas {
         val bmp = innerBitmap ?: throw UnsupportedOperationException()
         return AndroidImage(bmp)
     }
+
+    override fun measureText(text: String): Double {
+        return textPaint.measureText(text) / innerDensity
+    }
 }

android/uhabits-android/src/main/java/org/isoron/platform/gui/AndroidDataView.kt

@@ -45,7 +45,24 @@ class AndroidDataView(
     override fun onTouchEvent(event: MotionEvent?) = detector.onTouchEvent(event)
     override fun onDown(e: MotionEvent?) = true
     override fun onShowPress(e: MotionEvent?) = Unit
-    override fun onSingleTapUp(e: MotionEvent?) = false
+
+    override fun onSingleTapUp(e: MotionEvent?): Boolean {
+        val x: Float
+        val y: Float
+        try {
+            val pointerId = e!!.getPointerId(0)
+            x = e.getX(pointerId)
+            y = e.getY(pointerId)
+        } catch (ex: RuntimeException) {
+            // Android often throws IllegalArgumentException here. Apparently,
+            // the pointer id may become invalid shortly after calling
+            // e.getPointerId.
+            return false
+        }
+        view?.onClick(x / canvas.innerDensity, y / canvas.innerDensity)
+        return true
+    }
+
     override fun onLongPress(e: MotionEvent?) = Unit
 
     override fun onScroll(
@@ -76,7 +93,16 @@ class AndroidDataView(
         velocityX: Float,
         velocityY: Float,
     ): Boolean {
-        scroller.fling(scroller.currX, scroller.currY, velocityX.toInt() / 2, 0, 0, 10000, 0, 0)
+        scroller.fling(
+            scroller.currX,
+            scroller.currY,
+            velocityX.toInt() / 2,
+            0,
+            0,
+            Integer.MAX_VALUE,
+            0,
+            0
+        )
         invalidate()
         scrollAnimator.duration = scroller.duration.toLong()
         scrollAnimator.start()
@@ -99,11 +125,14 @@ class AndroidDataView(
     }
 
     private fun updateDataOffset() {
-        var newDataOffset: Int = scroller.currX / (view.dataColumnWidth * canvas.innerDensity).toInt()
+        view?.let { v ->
-        newDataOffset = Math.max(0, newDataOffset)
+            var newDataOffset: Int =
-        if (newDataOffset != view.dataOffset) {
+                scroller.currX / (v.dataColumnWidth * canvas.innerDensity).toInt()
-            view.dataOffset = newDataOffset
+            newDataOffset = Math.max(0, newDataOffset)
-            postInvalidate()
+            if (newDataOffset != v.dataOffset) {
+                v.dataOffset = newDataOffset
+                postInvalidate()
+            }
         }
     }
 }

android/uhabits-android/src/main/java/org/isoron/platform/gui/AndroidView.kt

@@ -27,7 +27,7 @@ open class AndroidView<T : View>(
     attrs: AttributeSet? = null,
 ) : android.view.View(context, attrs) {
 
-    lateinit var view: T
+    var view: T? = null
     val canvas = AndroidCanvas()
 
     override fun onDraw(canvas: android.graphics.Canvas) {
@@ -36,6 +36,6 @@ open class AndroidView<T : View>(
         this.canvas.innerWidth = width
         this.canvas.innerHeight = height
         this.canvas.innerDensity = resources.displayMetrics.density.toDouble()
-        view.draw(this.canvas)
+        view?.draw(this.canvas)
     }
 }

android/uhabits-android/src/main/java/org/isoron/uhabits/activities/common/dialogs/HistoryEditorDialog.java

@@ -1,203 +0,0 @@
-/*
- * Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
- *
- * This file is part of Loop Habit Tracker.
- *
- * Loop Habit Tracker is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by the
- * Free Software Foundation, either version 3 of the License, or (at your
- * option) any later version.
- *
- * Loop Habit Tracker is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.isoron.uhabits.activities.common.dialogs;
-
-import android.app.*;
-import android.content.*;
-import android.os.*;
-import android.util.*;
-
-import androidx.annotation.Nullable;
-import androidx.annotation.*;
-import androidx.appcompat.app.AlertDialog;
-import androidx.appcompat.app.*;
-
-import org.isoron.uhabits.*;
-import org.isoron.uhabits.core.commands.*;
-import org.isoron.uhabits.core.models.*;
-import org.isoron.uhabits.core.preferences.*;
-import org.isoron.uhabits.core.tasks.*;
-import org.isoron.uhabits.core.ui.callbacks.*;
-import org.isoron.uhabits.core.ui.screens.habits.show.views.*;
-import org.isoron.uhabits.core.ui.views.*;
-import org.isoron.uhabits.utils.*;
-import org.jetbrains.annotations.*;
-
-import java.util.*;
-
-public class HistoryEditorDialog extends AppCompatDialogFragment
-        implements DialogInterface.OnClickListener, CommandRunner.Listener
-{
-    @Nullable
-    private Habit habit;
-
-    @Nullable
-    HistoryChart historyChart;
-
-    @NonNull
-    private OnToggleCheckmarkListener onToggleCheckmarkListener;
-
-    private HabitList habitList;
-
-    private TaskRunner taskRunner;
-
-    private Preferences prefs;
-
-    private CommandRunner commandRunner;
-
-    public HistoryEditorDialog()
-    {
-        this.onToggleCheckmarkListener = new OnToggleCheckmarkListener()
-        {
-            @Override
-            public void onToggleEntry(@NotNull Timestamp timestamp, int value)
-            {
-            }
-        };
-    }
-
-    @Override
-    public void onClick(DialogInterface dialog, int which)
-    {
-        dismiss();
-    }
-
-    @NonNull
-    @Override
-    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState)
-    {
-        Context context = getActivity();
-
-        HabitsApplication app =
-            (HabitsApplication) getActivity().getApplicationContext();
-        habitList = app.getComponent().getHabitList();
-        taskRunner = app.getComponent().getTaskRunner();
-        commandRunner = app.getComponent().getCommandRunner();
-        prefs = app.getComponent().getPreferences();
-
-//        historyChart = new HistoryChart(context);
-//        historyChart.setOnToggleCheckmarkListener(onToggleCheckmarkListener);
-//        historyChart.setFirstWeekday(prefs.getFirstWeekday());
-//        historyChart.setSkipEnabled(prefs.isSkipEnabled());
-
-//        if (savedInstanceState != null)
-//        {
-//            long id = savedInstanceState.getLong("habit", -1);
-//            if (id > 0) this.habit = habitList.getById(id);
-//            historyChart.onRestoreInstanceState(
-//                savedInstanceState.getParcelable("historyChart"));
-//        }
-//
-//        int padding =
-//            (int) getDimension(getContext(), R.dimen.history_editor_padding);
-//
-//        historyChart.setPadding(padding, 0, padding, 0);
-//        historyChart.setIsEditable(true);
-//
-        AlertDialog.Builder builder = new AlertDialog.Builder(context);
-        builder
-            .setTitle(R.string.history)
-//            .setView(historyChart)
-            .setPositiveButton(android.R.string.ok, this);
-//
-        return builder.create();
-    }
-
-    @Override
-    public void onResume()
-    {
-        super.onResume();
-
-        DisplayMetrics metrics = getResources().getDisplayMetrics();
-        int maxHeight = getResources().getDimensionPixelSize(
-            R.dimen.history_editor_max_height);
-        int width = metrics.widthPixels;
-        int height = Math.min(metrics.heightPixels, maxHeight);
-
-        getDialog().getWindow().setLayout(width, height);
-        commandRunner.addListener(this);
-        refreshData();
-    }
-
-    @Override
-    public void onPause()
-    {
-        commandRunner.removeListener(this);
-        super.onPause();
-    }
-
-    @Override
-    public void onSaveInstanceState(Bundle outState)
-    {
-//        outState.putLong("habit", habit.getId());
-//        outState.putParcelable("historyChart", historyChart.onSaveInstanceState());
-    }
-
-    public void setOnToggleCheckmarkListener(@NonNull OnToggleCheckmarkListener onToggleCheckmarkListener)
-    {
-        this.onToggleCheckmarkListener = onToggleCheckmarkListener;
-    }
-
-    public void setHabit(@Nullable Habit habit)
-    {
-        this.habit = habit;
-    }
-
-    private void refreshData()
-    {
-        if (habit == null) return;
-        taskRunner.execute(new RefreshTask());
-    }
-
-    @Override
-    public void onCommandFinished(@NonNull Command command)
-    {
-        refreshData();
-    }
-
-    private class RefreshTask implements Task
-    {
-        public List<HistoryChart.Square> checkmarks;
-
-        @Override
-        public void doInBackground()
-        {
-            HistoryCardViewModel model = new HistoryCardPresenter().present(
-                    habit,
-                    prefs.getFirstWeekday(),
-                    prefs.isSkipEnabled(),
-                    new LightTheme()
-            );
-            checkmarks = model.getSeries();
-        }
-
-        @Override
-        public void onPostExecute()
-        {
-            if (getContext() == null || habit == null || historyChart == null)
-                return;
-
-            int color = PaletteUtilsKt.toThemedAndroidColor(habit.getColor(), getContext());
-//            historyChart.setColor(color);
-//            historyChart.setEntries(checkmarks);
-//            historyChart.setNumerical(habit.isNumerical());
-        }
-    }
-}

android/uhabits-android/src/main/java/org/isoron/uhabits/activities/common/dialogs/HistoryEditorDialog.kt

@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.isoron.uhabits.activities.common.dialogs
+
+import android.app.Dialog
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatDialogFragment
+import org.isoron.platform.gui.AndroidDataView
+import org.isoron.platform.time.JavaLocalDateFormatter
+import org.isoron.uhabits.HabitsApplication
+import org.isoron.uhabits.R
+import org.isoron.uhabits.core.commands.Command
+import org.isoron.uhabits.core.commands.CommandRunner
+import org.isoron.uhabits.core.models.Habit
+import org.isoron.uhabits.core.preferences.Preferences
+import org.isoron.uhabits.core.ui.screens.habits.show.views.HistoryCardPresenter
+import org.isoron.uhabits.core.ui.views.HistoryChart
+import org.isoron.uhabits.core.ui.views.LightTheme
+import org.isoron.uhabits.core.ui.views.OnDateClickedListener
+import org.isoron.uhabits.core.utils.DateUtils
+import java.util.Locale
+import kotlin.math.min
+
+class HistoryEditorDialog : AppCompatDialogFragment(), CommandRunner.Listener {
+
+    private lateinit var commandRunner: CommandRunner
+    private lateinit var habit: Habit
+    private lateinit var preferences: Preferences
+    private lateinit var dataView: AndroidDataView
+
+    private var chart: HistoryChart? = null
+    private var onDateClickedListener: OnDateClickedListener? = null
+
+    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
+        val component = (activity!!.application as HabitsApplication).component
+        commandRunner = component.commandRunner
+        habit = component.habitList.getById(arguments!!.getLong("habit"))!!
+        preferences = component.preferences
+
+        chart = HistoryChart(
+            dateFormatter = JavaLocalDateFormatter(Locale.getDefault()),
+            firstWeekday = preferences.firstWeekday,
+            paletteColor = habit.color,
+            series = emptyList(),
+            theme = LightTheme(),
+            today = DateUtils.getTodayWithOffset().toLocalDate(),
+            onDateClickedListener = onDateClickedListener ?: OnDateClickedListener { },
+            padding = 10.0,
+        )
+        dataView = AndroidDataView(context!!, null)
+        dataView.view = chart!!
+
+        return Dialog(context!!).apply {
+            val metrics = resources.displayMetrics
+            val maxHeight = resources.getDimensionPixelSize(R.dimen.history_editor_max_height)
+            setContentView(dataView)
+            window!!.setLayout(metrics.widthPixels, min(metrics.heightPixels, maxHeight))
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+        commandRunner.addListener(this)
+        refreshData()
+    }
+
+    override fun onPause() {
+        commandRunner.removeListener(this)
+        super.onPause()
+    }
+
+    fun setOnDateClickedListener(listener: OnDateClickedListener) {
+        onDateClickedListener = listener
+        chart?.onDateClickedListener = listener
+    }
+
+    private fun refreshData() {
+        val model = HistoryCardPresenter().present(
+            habit,
+            preferences.firstWeekday,
+            preferences.isSkipEnabled,
+            theme = LightTheme()
+        )
+        chart?.series = model.series
+        dataView.postInvalidate()
+    }
+
+    override fun onCommandFinished(command: Command) {
+        refreshData()
+    }
+}

android/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/show/ShowHabitActivity.kt

@@ -31,6 +31,7 @@ import org.isoron.uhabits.HabitsApplication
 import org.isoron.uhabits.activities.AndroidThemeSwitcher
 import org.isoron.uhabits.activities.HabitsDirFinder
 import org.isoron.uhabits.activities.common.dialogs.ConfirmDeleteDialogFactory
+import org.isoron.uhabits.activities.common.dialogs.HistoryEditorDialog
 import org.isoron.uhabits.activities.common.dialogs.NumberPickerFactory
 import org.isoron.uhabits.core.commands.Command
 import org.isoron.uhabits.core.commands.CommandRunner
@@ -51,6 +52,7 @@ class ShowHabitActivity : AppCompatActivity(), CommandRunner.Listener {
     private lateinit var habit: Habit
     private lateinit var preferences: Preferences
     private lateinit var themeSwitcher: AndroidThemeSwitcher
+    private lateinit var behavior: ShowHabitBehavior
 
     private val scope = CoroutineScope(Dispatchers.Main)
 
@@ -76,7 +78,7 @@ class ShowHabitActivity : AppCompatActivity(), CommandRunner.Listener {
             widgetUpdater = appComponent.widgetUpdater,
         )
 
-        val behavior = ShowHabitBehavior(
+        behavior = ShowHabitBehavior(
             commandRunner = commandRunner,
             habit = habit,
             habitList = habitList,
@@ -118,6 +120,9 @@ class ShowHabitActivity : AppCompatActivity(), CommandRunner.Listener {
     override fun onResume() {
         super.onResume()
         commandRunner.addListener(this)
+        supportFragmentManager.findFragmentByTag("historyEditor")?.let {
+            (it as HistoryEditorDialog).setOnDateClickedListener(behavior)
+        }
         refresh()
     }
 

android/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/show/ShowHabitScreen.kt

@@ -19,16 +19,18 @@
 
 package org.isoron.uhabits.activities.habits.show
 
+import android.os.Bundle
+import android.view.HapticFeedbackConstants
 import org.isoron.uhabits.R
 import org.isoron.uhabits.activities.common.dialogs.ConfirmDeleteDialogFactory
 import org.isoron.uhabits.activities.common.dialogs.HistoryEditorDialog
 import org.isoron.uhabits.activities.common.dialogs.NumberPickerFactory
 import org.isoron.uhabits.core.models.Habit
 import org.isoron.uhabits.core.ui.callbacks.OnConfirmedCallback
-import org.isoron.uhabits.core.ui.callbacks.OnToggleCheckmarkListener
 import org.isoron.uhabits.core.ui.screens.habits.list.ListHabitsBehavior
 import org.isoron.uhabits.core.ui.screens.habits.show.ShowHabitBehavior
 import org.isoron.uhabits.core.ui.screens.habits.show.ShowHabitMenuBehavior
+import org.isoron.uhabits.core.ui.views.OnDateClickedListener
 import org.isoron.uhabits.intents.IntentFactory
 import org.isoron.uhabits.utils.showMessage
 import org.isoron.uhabits.utils.showSendFileScreen
@@ -43,7 +45,11 @@ class ShowHabitScreen(
     val widgetUpdater: WidgetUpdater,
 ) : ShowHabitBehavior.Screen, ShowHabitMenuBehavior.Screen {
 
-    override fun showNumberPicker(value: Double, unit: String, callback: ListHabitsBehavior.NumberPickerCallback) {
+    override fun showNumberPicker(
+        value: Double,
+        unit: String,
+        callback: ListHabitsBehavior.NumberPickerCallback,
+    ) {
         numberPickerFactory.create(value, unit, callback).show()
     }
 
@@ -55,13 +61,19 @@ class ShowHabitScreen(
         activity.refresh()
     }
 
-    override fun showHistoryEditorDialog(listener: OnToggleCheckmarkListener) {
+    override fun showHistoryEditorDialog(listener: OnDateClickedListener) {
         val dialog = HistoryEditorDialog()
-        dialog.setHabit(habit)
+        dialog.arguments = Bundle().apply {
-        dialog.setOnToggleCheckmarkListener(listener)
+            putLong("habit", habit.id!!)
+        }
+        dialog.setOnDateClickedListener(listener)
         dialog.show(activity.supportFragmentManager, "historyEditor")
     }
 
+    override fun touchFeedback() {
+        activity.window.decorView.performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY)
+    }
+
     override fun showEditHabitScreen(habit: Habit) {
         activity.startActivity(intentFactory.startEditActivity(activity, habit))
     }

android/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/show/views/HistoryCardView.kt

@@ -40,7 +40,6 @@ class HistoryCardView(context: Context, attrs: AttributeSet) : LinearLayout(cont
     }
 
     fun update(data: HistoryCardViewModel) {
-
         val androidColor = data.color.toThemedAndroidColor(context)
         binding.title.setTextColor(androidColor)
         binding.chart.view = HistoryChart(
@@ -51,10 +50,6 @@ class HistoryCardView(context: Context, attrs: AttributeSet) : LinearLayout(cont
             series = data.series,
             firstWeekday = data.firstWeekday,
         )
-
+        binding.chart.postInvalidate()
-        // binding.historyChart.setSkipEnabled(data.isSkipEnabled)
-        // if (data.isNumerical) {
-        //     binding.historyChart.setNumerical(true)
-        // }
     }
 }

android/uhabits-android/src/main/res/values/dimens.xml

@@ -21,8 +21,7 @@
     <dimen name="baseSize">20dp</dimen>
     <dimen name="checkmarkWidth">48dp</dimen>
     <dimen name="checkmarkHeight">48dp</dimen>
-    <dimen name="history_editor_max_height">450dp</dimen>
+    <dimen name="history_editor_max_height">350dp</dimen>
-    <dimen name="history_editor_padding">8dp</dimen>
     <dimen name="regularTextSize">16sp</dimen>
     <dimen name="smallTextSize">14sp</dimen>
     <dimen name="smallerTextSize">12sp</dimen>

android/uhabits-core/src/main/java/org/isoron/platform/gui/Canvas.kt

@@ -51,6 +51,7 @@ interface Canvas {
     fun fillCircle(centerX: Double, centerY: Double, radius: Double)
     fun setTextAlign(align: TextAlign)
     fun toImage(): Image
+    fun measureText(test: String): Double
 
     /**
      * Fills entire canvas with the current color.

android/uhabits-core/src/main/java/org/isoron/platform/gui/JavaCanvas.kt

@@ -36,13 +36,18 @@ import kotlin.math.roundToInt
 
 class JavaCanvas(
     val image: BufferedImage,
-    val pixelScale: Double = 2.0
+    val pixelScale: Double = 2.0,
 ) : Canvas {
 
     override fun toImage(): Image {
         return JavaImage(image)
     }
 
+    override fun measureText(text: String): Double {
+        val metrics = g2d.getFontMetrics(g2d.font)
+        return toDp(metrics.stringWidth(text))
+    }
+
     private val frc = FontRenderContext(null, true, true)
     private var fontSize = 12.0
     private var font = Font.REGULAR
@@ -121,7 +126,7 @@ class JavaCanvas(
         y: Double,
         width: Double,
         height: Double,
-        cornerRadius: Double
+        cornerRadius: Double,
     ) {
         g2d.fill(
             RoundRectangle2D.Double(
@@ -184,7 +189,7 @@ class JavaCanvas(
         centerY: Double,
         radius: Double,
         startAngle: Double,
-        swipeAngle: Double
+        swipeAngle: Double,
     ) {
 
         g2d.fillArc(

android/uhabits-core/src/main/java/org/isoron/platform/gui/View.kt

@@ -21,6 +21,8 @@ package org.isoron.platform.gui
 
 interface View {
     fun draw(canvas: Canvas)
+    fun onClick(x: Double, y: Double) {
+    }
 }
 
 interface DataView : View {

android/uhabits-core/src/main/java/org/isoron/platform/time/Dates.kt

@@ -128,9 +128,14 @@ data class LocalDate(val daysSince2000: Int) {
     fun distanceTo(other: LocalDate): Int {
         return abs(daysSince2000 - other.daysSince2000)
     }
+
+    override fun toString(): String {
+        return "LocalDate($year-$month-$day)"
+    }
 }
 
 interface LocalDateFormatter {
+    fun shortWeekdayName(weekday: DayOfWeek): String
     fun shortWeekdayName(date: LocalDate): String
     fun shortMonthName(date: LocalDate): String
 }

android/uhabits-core/src/main/java/org/isoron/platform/time/JavaDates.kt

@@ -56,6 +56,12 @@ class JavaLocalDateFormatter(private val locale: Locale) : LocalDateFormatter {
         return if (longName.length <= 3) longName else shortName
     }
 
+    override fun shortWeekdayName(weekday: DayOfWeek): String {
+        val cal = GregorianCalendar()
+        cal.set(DAY_OF_WEEK, weekday.daysSinceSunday - 1)
+        return shortWeekdayName(LocalDate(cal.get(YEAR), cal.get(MONTH) + 1, cal.get(DAY_OF_MONTH)))
+    }
+
     override fun shortWeekdayName(date: LocalDate): String {
         val cal = date.toGregorianCalendar()
         return cal.getDisplayName(DAY_OF_WEEK, SHORT, locale)

android/uhabits-core/src/main/java/org/isoron/uhabits/core/ui/screens/habits/show/ShowHabitBehavior.kt

@@ -18,14 +18,15 @@
  */
 package org.isoron.uhabits.core.ui.screens.habits.show
 
+import org.isoron.platform.time.LocalDate
 import org.isoron.uhabits.core.commands.CommandRunner
 import org.isoron.uhabits.core.commands.CreateRepetitionCommand
+import org.isoron.uhabits.core.models.Entry
 import org.isoron.uhabits.core.models.Habit
 import org.isoron.uhabits.core.models.HabitList
-import org.isoron.uhabits.core.models.Timestamp
 import org.isoron.uhabits.core.preferences.Preferences
-import org.isoron.uhabits.core.ui.callbacks.OnToggleCheckmarkListener
 import org.isoron.uhabits.core.ui.screens.habits.list.ListHabitsBehavior
+import org.isoron.uhabits.core.ui.views.OnDateClickedListener
 import kotlin.math.roundToInt
 
 class ShowHabitBehavior(
@@ -34,7 +35,7 @@ class ShowHabitBehavior(
     private val habit: Habit,
     private val screen: Screen,
     private val preferences: Preferences,
-) : OnToggleCheckmarkListener {
+) : OnDateClickedListener {
 
     fun onScoreCardSpinnerPosition(position: Int) {
         preferences.scoreCardSpinnerPosition = position
@@ -58,7 +59,9 @@ class ShowHabitBehavior(
         screen.showHistoryEditorDialog(this)
     }
 
-    override fun onToggleEntry(timestamp: Timestamp, value: Int) {
+    override fun onDateClicked(date: LocalDate) {
+        val timestamp = date.timestamp
+        screen.touchFeedback()
         if (habit.isNumerical) {
             val entries = habit.computedEntries
             val oldValue = entries.get(timestamp).value
@@ -74,12 +77,18 @@ class ShowHabitBehavior(
                 )
             }
         } else {
+            val currentValue = habit.computedEntries.get(timestamp).value
+            val nextValue = if (preferences.isSkipEnabled) {
+                Entry.nextToggleValueWithSkip(currentValue)
+            } else {
+                Entry.nextToggleValueWithoutSkip(currentValue)
+            }
             commandRunner.run(
                 CreateRepetitionCommand(
                     habitList,
                     habit,
                     timestamp,
-                    value,
+                    nextValue,
                 ),
             )
         }
@@ -89,11 +98,12 @@ class ShowHabitBehavior(
         fun showNumberPicker(
             value: Double,
             unit: String,
-            callback: ListHabitsBehavior.NumberPickerCallback
+            callback: ListHabitsBehavior.NumberPickerCallback,
         )
 
         fun updateWidgets()
         fun refresh()
-        fun showHistoryEditorDialog(listener: OnToggleCheckmarkListener)
+        fun showHistoryEditorDialog(listener: OnDateClickedListener)
+        fun touchFeedback()
     }
 }

android/uhabits-core/src/main/java/org/isoron/uhabits/core/ui/views/HistoryChart.kt

@@ -28,15 +28,23 @@ import org.isoron.platform.time.LocalDate
 import org.isoron.platform.time.LocalDateFormatter
 import org.isoron.uhabits.core.models.PaletteColor
 import kotlin.math.floor
+import kotlin.math.max
+import kotlin.math.min
 import kotlin.math.round
 
+fun interface OnDateClickedListener {
+    fun onDateClicked(date: LocalDate)
+}
+
 class HistoryChart(
-    var today: LocalDate,
-    var paletteColor: PaletteColor,
-    var theme: Theme,
     var dateFormatter: LocalDateFormatter,
     var firstWeekday: DayOfWeek,
+    var paletteColor: PaletteColor,
     var series: List<Square>,
+    var theme: Theme,
+    var today: LocalDate,
+    var onDateClickedListener: OnDateClickedListener = OnDateClickedListener { },
+    var padding: Double = 0.0,
 ) : DataView {
 
     enum class Square {
@@ -46,38 +54,58 @@ class HistoryChart(
         HATCHED,
     }
 
-    // Style
-    var padding = 0.0
     var squareSpacing = 1.0
     override var dataOffset = 0
-    private var squareSize = 0.0
 
-    var lastPrintedMonth = ""
+    private var squareSize = 0.0
-    var lastPrintedYear = ""
+    private var width = 0.0
+    private var height = 0.0
+    private var nColumns = 0
+    private var topLeftOffset = 0
+    private var topLeftDate = LocalDate(2020, 1, 1)
+    private var lastPrintedMonth = ""
+    private var lastPrintedYear = ""
+    private var headerOverflow = 0.0
 
     override val dataColumnWidth: Double
         get() = squareSpacing + squareSize
 
+    override fun onClick(x: Double, y: Double) {
+        if (width <= 0.0) throw IllegalStateException("onClick must be called after draw(canvas)")
+        val col = ((x - padding) / squareSize).toInt()
+        val row = ((y - padding) / squareSize).toInt()
+        val offset = col * 7 + (row - 1)
+        if (row == 0 || col == nColumns) return
+        val clickedDate = topLeftDate.plus(offset)
+        if (clickedDate.isNewerThan(today)) return
+        onDateClickedListener.onDateClicked(clickedDate)
+    }
+
     override fun draw(canvas: Canvas) {
-        val width = canvas.getWidth()
+        width = canvas.getWidth()
-        val height = canvas.getHeight()
+        height = canvas.getHeight()
 
         canvas.setColor(theme.cardBackgroundColor)
         canvas.fill()
 
         squareSize = round((height - 2 * padding) / 8.0)
-        canvas.setFontSize(height * 0.06)
+        canvas.setFontSize(min(14.0, height * 0.06))
 
-        val nColumns = floor((width - 2 * padding) / squareSize).toInt() - 2
+        val weekdayColumnWidth = DayOfWeek.values().map { weekday ->
+            canvas.measureText(dateFormatter.shortWeekdayName(weekday)) + squareSize * 0.15
+        }.maxOrNull() ?: 0.0
+
+        nColumns = floor((width - 2 * padding - weekdayColumnWidth) / squareSize).toInt()
         val firstWeekdayOffset = (
             today.dayOfWeek.daysSinceSunday -
                 firstWeekday.daysSinceSunday + 7
             ) % 7
-        val topLeftOffset = (nColumns - 1 + dataOffset) * 7 + firstWeekdayOffset
+        topLeftOffset = (nColumns - 1 + dataOffset) * 7 + firstWeekdayOffset
-        val topLeftDate = today.minus(topLeftOffset)
+        topLeftDate = today.minus(topLeftOffset)
 
         lastPrintedYear = ""
         lastPrintedMonth = ""
+        headerOverflow = 0.0
 
         // Draw main columns
         repeat(nColumns) { column ->
@@ -93,7 +121,7 @@ class HistoryChart(
             canvas.setTextAlign(TextAlign.LEFT)
             canvas.drawText(
                 dateFormatter.shortWeekdayName(date),
-                padding + nColumns * squareSize + squareSpacing * 3,
+                padding + nColumns * squareSize + squareSize * 0.15,
                 padding + squareSize * (row + 1) + squareSize / 2
             )
         }
@@ -143,9 +171,12 @@ class HistoryChart(
         canvas.setTextAlign(TextAlign.LEFT)
         canvas.drawText(
             headerText,
-            padding + column * squareSize,
+            headerOverflow + padding + column * squareSize,
             padding + squareSize / 2
         )
+
+        headerOverflow += canvas.measureText(headerText) + 0.1 * squareSize
+        headerOverflow = max(0.0, headerOverflow - squareSize)
     }
 
     private fun drawSquare(

android/uhabits-core/src/test/java/org/isoron/uhabits/core/ui/views/HistoryChartTest.kt

@@ -33,19 +33,27 @@ import org.isoron.uhabits.core.ui.views.HistoryChart.Square.HATCHED
 import org.isoron.uhabits.core.ui.views.HistoryChart.Square.OFF
 import org.isoron.uhabits.core.ui.views.HistoryChart.Square.ON
 import org.isoron.uhabits.core.ui.views.LightTheme
+import org.isoron.uhabits.core.ui.views.OnDateClickedListener
 import org.isoron.uhabits.core.ui.views.WidgetTheme
 import org.junit.Test
+import org.mockito.Mockito.mock
+import org.mockito.Mockito.reset
+import org.mockito.Mockito.verify
+import org.mockito.Mockito.verifyNoMoreInteractions
 import java.util.Locale
 
 class HistoryChartTest {
     val base = "views/HistoryChart"
 
+    val dateClickedListener = mock(OnDateClickedListener::class.java)
+
     val view = HistoryChart(
         today = LocalDate(2015, 1, 25),
         paletteColor = PaletteColor(7),
         theme = LightTheme(),
         dateFormatter = JavaLocalDateFormatter(Locale.US),
         firstWeekday = SUNDAY,
+        onDateClickedListener = dateClickedListener,
         series = listOf(
             2, // today
             2, 1, 2, 1, 2, 1, 2,
@@ -71,16 +79,42 @@ class HistoryChartTest {
         }
     )
 
-    // TODO: Label overflow
-    // TODO: onClick
-    // TODO: HistoryEditorDialog
-    // TODO: Remove excessive padding on widgets
-
     @Test
     fun testDraw() = runBlocking {
         assertRenders(400, 200, "$base/base.png", view)
     }
 
+    @Test
+    fun testClick() = runBlocking {
+        assertRenders(400, 200, "$base/base.png", view)
+
+        // Click top left date
+        view.onClick(20.0, 46.0)
+        verify(dateClickedListener).onDateClicked(LocalDate(2014, 10, 26))
+        reset(dateClickedListener)
+        view.onClick(2.0, 28.0)
+        verify(dateClickedListener).onDateClicked(LocalDate(2014, 10, 26))
+        reset(dateClickedListener)
+
+        // Click date in the middle
+        view.onClick(163.0, 113.0)
+        verify(dateClickedListener).onDateClicked(LocalDate(2014, 12, 10))
+        reset(dateClickedListener)
+
+        // Click today
+        view.onClick(336.0, 37.0)
+        verify(dateClickedListener).onDateClicked(LocalDate(2015, 1, 25))
+        reset(dateClickedListener)
+
+        // Click header
+        view.onClick(160.0, 15.0)
+        verifyNoMoreInteractions(dateClickedListener)
+
+        // Click right axis
+        view.onClick(360.0, 60.0)
+        verifyNoMoreInteractions(dateClickedListener)
+    }
+
     @Test
     fun testDrawWeekDay() = runBlocking {
         view.firstWeekday = DayOfWeek.MONDAY