feature: Allow changing deck name in statistics screen

AnkiDroid/src/main/AndroidManifest.xml

@@ -431,6 +431,9 @@
             android:exported="false"
             android:configChanges="orientation|screenSize"
             />
+        <activity android:name="com.ichi2.anki.StatisticsActivity"
+            android:exported="false"
+            android:configChanges="orientation|screenSize" />
         <activity
             android:name="com.ichi2.anki.previewer.PreviewerActivity"
             android:exported="false"

AnkiDroid/src/main/java/com/ichi2/anki/DeckMaterialButtonSelection.kt

@@ -0,0 +1,90 @@
+/*
+ *  Copyright (c) 2024 Ashish Yadav <mailtoashish693@gmail.com>
+ *
+ *  This program 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.
+ *
+ *  This program 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 com.ichi2.anki
+
+import androidx.annotation.MainThread
+import androidx.appcompat.app.AppCompatActivity
+import com.google.android.material.button.MaterialButton
+import com.ichi2.anki.dialogs.DeckSelectionDialog
+import com.ichi2.anki.dialogs.DeckSelectionDialog.SelectableDeck.Companion.fromCollection
+import com.ichi2.anki.widgets.DeckDropDownAdapter
+import com.ichi2.libanki.Collection
+import com.ichi2.libanki.DeckNameId
+import com.ichi2.utils.FragmentManagerSupplier
+import com.ichi2.utils.asFragmentManagerSupplier
+import timber.log.Timber
+
+/**
+ * Handles deck selection using a MaterialButton.
+ * Decks are selected from a dialog displayed when the MaterialButton is clicked.
+ *
+ * @param context The context of the Activity
+ * @param materialButton The MaterialButton used for deck selection.
+ * @param showAllDecks Indicates whether to show all decks including filtered ones.
+*/
+class DeckMaterialButtonSelection(
+    private val context: AppCompatActivity,
+    private val materialButton: MaterialButton,
+    private val showAllDecks: Boolean
+) {
+
+    private val fragmentManagerSupplier: FragmentManagerSupplier = context.asFragmentManagerSupplier()
+
+    private var deckDropDownAdapter: DeckDropDownAdapter? = null
+
+    private lateinit var dropDownDecks: MutableList<DeckNameId>
+
+    @MainThread
+    fun initializeNoteEditorDeckMaterialButton(col: Collection) {
+        dropDownDecks = computeDropDownDecks(col).toMutableList()
+        setMaterialButtonListener()
+    }
+
+    private fun computeDropDownDecks(col: Collection): List<DeckNameId> =
+        col.decks.allNamesAndIds(includeFiltered = false)
+
+    private fun setMaterialButtonListener() {
+        materialButton.setOnClickListener {
+            context.launchCatchingTask { displayDeckSelectionDialog() }
+        }
+    }
+
+    private suspend fun displayDeckSelectionDialog() {
+        val decks = fromCollection(includeFiltered = false).toMutableList()
+        if (showAllDecks) {
+            decks.add(
+                DeckSelectionDialog.SelectableDeck(
+                    ALL_DECKS_ID,
+                    context.resources.getString(R.string.card_browser_all_decks)
+                )
+            )
+        }
+        val dialog = DeckSelectionDialog.newInstance(context.getString(R.string.search_deck), null, false, decks)
+        dialog.deckCreationListener = DeckSelectionDialog.DeckCreationListener { onDeckAdded(it) }
+        AnkiActivity.showDialogFragment(fragmentManagerSupplier.getFragmentManager(), dialog)
+    }
+
+    private fun onDeckAdded(deck: DeckNameId) {
+        Timber.d("added deck %s to MaterialButton", deck)
+        deckDropDownAdapter?.addDeck(deck)
+        dropDownDecks.add(deck)
+    }
+
+    companion object {
+        const val ALL_DECKS_ID = 0L
+    }
+}

AnkiDroid/src/main/java/com/ichi2/anki/StatisticsActivity.kt

@@ -0,0 +1,79 @@
+/*
+ *  Copyright (c) 2024 Ashish Yadav <mailtoashish693@gmail.com>
+ *
+ *  This program 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.
+ *
+ *  This program 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 com.ichi2.anki
+
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.view.View
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.MutableLiveData
+import com.google.android.material.button.MaterialButton
+import com.ichi2.anki.dialogs.DeckSelectionDialog
+import com.ichi2.libanki.Collection
+import com.ichi2.libanki.DeckId
+import kotlin.reflect.KClass
+import kotlin.reflect.jvm.jvmName
+
+/**
+ * Handles changing of deck in Statistics webview
+ *
+ * Based in [SingleFragmentActivity], but with `configChanges="orientation|screenSize"`
+ * to avoid unwanted activity recreations
+ */
+class StatisticsActivity : SingleFragmentActivity(), DeckSelectionDialog.DeckSelectionListener {
+
+    private var deckMaterialSelection: DeckMaterialButtonSelection? = null
+    var deckId: DeckId = 0
+    var deckNameLive = MutableLiveData<String>()
+    private var collection: Collection? = null
+
+    override fun onCollectionLoaded(col: Collection) {
+        super.onCollectionLoaded(col)
+        collection = col
+    }
+
+    fun setupDeckSelector(button: MaterialButton) {
+        button.visibility = View.VISIBLE
+        startLoadingCollection()
+        deckMaterialSelection = DeckMaterialButtonSelection(
+            this,
+            button,
+            showAllDecks = true
+        ).apply {
+            collection?.let { initializeNoteEditorDeckMaterialButton(it) }
+        }
+    }
+
+    override fun onDeckSelected(deck: DeckSelectionDialog.SelectableDeck?) {
+        if (deck == null) {
+            return
+        }
+        deckNameLive.value = deck.name
+        deckId = deck.deckId
+    }
+
+    companion object {
+
+        fun getIntent(context: Context, fragmentClass: KClass<out Fragment>, arguments: Bundle? = null): Intent {
+            return Intent(context, StatisticsActivity::class.java).apply {
+                putExtra(FRAGMENT_NAME_EXTRA, fragmentClass.jvmName)
+                putExtra(FRAGMENT_ARGS_EXTRA, arguments)
+            }
+        }
+    }
+}

AnkiDroid/src/main/java/com/ichi2/anki/pages/Statistics.kt

@@ -22,10 +22,11 @@ import android.print.PrintAttributes
 import android.print.PrintManager
 import android.view.View
 import androidx.core.content.ContextCompat.getSystemService
+import androidx.lifecycle.Observer
 import com.google.android.material.appbar.MaterialToolbar
 import com.ichi2.anki.CollectionManager
 import com.ichi2.anki.R
-import com.ichi2.anki.SingleFragmentActivity
+import com.ichi2.anki.StatisticsActivity
 import com.ichi2.anki.utils.getTimestamp
 import com.ichi2.libanki.utils.TimeManager
 
@@ -47,6 +48,28 @@ class Statistics : PageFragment() {
                 true
             }
         }
+        (activity as? StatisticsActivity)?.setupDeckSelector(view.findViewById(R.id.change_deck_button))
+
+        (activity as? StatisticsActivity)?.deckNameLive?.observe(
+            viewLifecycleOwner,
+            Observer { deck ->
+                changeDeck(deck)
+            }
+        )
+    }
+
+    /**
+     * This method is a workaround to change the deck in the webview by finding the text box and
+     * replacing the deck name with the selected deck name from the dialog and updating the stats
+     **/
+    private fun changeDeck(selectedDeck: String) {
+        val javascriptCode = """
+        var textBox = [].slice.call(document.getElementsByTagName('input'), 0).filter(x => x.type == "text")[0];
+        textBox.value = "deck:$selectedDeck";
+        textBox.dispatchEvent(new Event("input", { bubbles: true }));
+        textBox.dispatchEvent(new Event("change"));
+        """.trimIndent()
+        webView.evaluateJavascript(javascriptCode, null)
     }
 
     /**Prepares and initiates a printing task for the content(stats) displayed in the WebView.
@@ -66,7 +89,7 @@ class Statistics : PageFragment() {
 
     companion object {
         fun getIntent(context: Context): Intent {
-            return SingleFragmentActivity.getIntent(context, Statistics::class)
+            return StatisticsActivity.getIntent(context, Statistics::class)
         }
     }
 }

AnkiDroid/src/main/res/layout/page_fragment.xml

@@ -18,7 +18,16 @@
     <WebView
         android:id="@+id/webview"
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1"
         android:visibility="invisible"/>
 
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/change_deck_button"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_margin="8dp"
+        android:text="@string/card_browser_change_deck"
+        android:visibility="gone" />
+
 </LinearLayout>

AnkiDroid/src/test/java/com/ichi2/testutils/ActivityList.kt

@@ -76,6 +76,7 @@ object ActivityList {
             get(PermissionsActivity::class.java),
             get(SingleFragmentActivity::class.java),
             get(ImageOcclusionActivity::class.java),
+            get(StatisticsActivity::class.java),
             get(PreviewerActivity::class.java)
         )
     }