commons-app#3524 Convert SpinnerLanguagesAdapter to kotlin - converted to kotlin (commons-app#3528)

* commons-app#3524 Convert SpinnerLanguagesAdapter to kotlin - converted to kotlin

* commons-app#3524 Convert SpinnerLanguagesAdapter to kotlin - add KDoc - rework logic - format

Author: macgills

app/build.gradle

@@ -5,6 +5,7 @@ apply from: '../gitutils.gradle'
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-kapt'
+apply plugin: 'kotlin-android-extensions'
 apply plugin: "com.hiya.jacoco-android"
 apply from: 'quality.gradle'
 
@@ -286,3 +287,7 @@ if(isRunningOnTravisAndIsNotPRBuild) {
         }
     }
 }
+
+androidExtensions {
+    experimental = true
+}

app/src/main/java/fr/free/nrw/commons/upload/DescriptionsAdapter.java

@@ -145,8 +145,8 @@ public void init(int position) {
         private void initLanguageSpinner(int position, Description description) {
             SpinnerLanguagesAdapter languagesAdapter = new SpinnerLanguagesAdapter(
                     spinnerDescriptionLanguages.getContext(),
-                    R.layout.row_item_languages_spinner, selectedLanguages,
-                    savedLanguageValue);
+                    selectedLanguages
+            );
             spinnerDescriptionLanguages.setAdapter(languagesAdapter);
 
             spinnerDescriptionLanguages.setOnItemSelectedListener(new OnItemSelectedListener() {
@@ -160,7 +160,7 @@ public void onItemSelected(AdapterView<?> adapterView, View view, int position,
                     selectedLanguages.remove(adapterView);
                     selectedLanguages.put(adapterView, languageCode);
                     ((SpinnerLanguagesAdapter) adapterView
-                            .getAdapter()).selectedLangCode = languageCode;
+                            .getAdapter()).setSelectedLangCode(languageCode);
                     spinnerDescriptionLanguages.setSelection(position);
                     Timber.d("Description language code is: "+languageCode);
                 }

app/src/main/java/fr/free/nrw/commons/upload/SpinnerLanguagesAdapter.java

@@ -0,0 +1,104 @@
+package fr.free.nrw.commons.upload
+
+import android.content.Context
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.ArrayAdapter
+import androidx.annotation.LayoutRes
+import androidx.core.os.ConfigurationCompat
+import fr.free.nrw.commons.R
+import fr.free.nrw.commons.utils.BiMap
+import fr.free.nrw.commons.utils.LangCodeUtils
+import kotlinx.android.extensions.LayoutContainer
+import kotlinx.android.synthetic.main.row_item_languages_spinner.*
+import org.apache.commons.lang3.StringUtils
+import java.util.*
+
+/**
+ * This class handles the display of language spinners and their dropdown views for UploadMediaDetailFragment
+ *
+ * @property selectedLanguages - controls the enabled state of dropdown views
+ *
+ * @param context - required by super constructor
+ */
+class SpinnerLanguagesAdapter constructor(
+    context: Context,
+    private val selectedLanguages: BiMap<*, String>
+) : ArrayAdapter<Any?>(context, -1) {
+
+    private val languageNamesList: List<String>
+    private val languageCodesList: List<String>
+
+    init {
+        val sortedLanguages = Locale.getAvailableLocales()
+            .map(::Language)
+            .sortedBy { it.locale.displayName }
+        languageNamesList = sortedLanguages.map { it.locale.displayName }
+        languageCodesList = sortedLanguages.map { it.locale.language }
+    }
+
+    var selectedLangCode = ""
+
+    override fun isEnabled(position: Int) = languageCodesList[position].let {
+        it.isNotEmpty() && !selectedLanguages.containsKey(it) && it != selectedLangCode
+    }
+
+    override fun getCount() = languageNamesList.size
+
+    override fun getDropDownView(position: Int, convertView: View?, parent: ViewGroup) =
+        (convertView ?: parent.inflate(R.layout.row_item_languages_spinner).also {
+            it.tag = DropDownViewHolder(it)
+        }).apply {
+            (tag as DropDownViewHolder).init(
+                languageCodesList[position],
+                languageNamesList[position],
+                isEnabled(position)
+            )
+        }
+
+    override fun getView(position: Int, convertView: View?, parent: ViewGroup) =
+        (convertView ?: parent.inflate(R.layout.row_item_languages_spinner).also {
+            it.tag = SpinnerViewHolder(it)
+        }).apply { (tag as SpinnerViewHolder).init(languageCodesList[position]) }
+
+    class SpinnerViewHolder(override val containerView: View) : LayoutContainer {
+        fun init(languageCode: String) {
+            LangCodeUtils.fixLanguageCode(languageCode).let {
+                tv_language.text = if (it.length > 2) it.take(2) else it
+            }
+        }
+    }
+
+    class DropDownViewHolder(override val containerView: View) : LayoutContainer {
+        fun init(languageCode: String, languageName: String, enabled: Boolean) {
+            tv_language.isEnabled = enabled
+            if (languageCode.isEmpty()) {
+                tv_language.text = StringUtils.capitalize(languageName)
+                tv_language.textAlignment = View.TEXT_ALIGNMENT_CENTER
+            } else {
+                tv_language.text =
+                    "${StringUtils.capitalize(languageName)}" +
+                            " [${LangCodeUtils.fixLanguageCode(languageCode)}]"
+            }
+        }
+    }
+
+    fun getLanguageCode(position: Int): String {
+        return languageCodesList[position]
+    }
+
+    fun getIndexOfUserDefaultLocale(context: Context): Int {
+        return languageCodesList.indexOf(context.locale.language)
+    }
+
+    fun getIndexOfLanguageCode(languageCode: String): Int {
+        return languageCodesList.indexOf(languageCode)
+    }
+}
+
+private fun ViewGroup.inflate(@LayoutRes resId: Int) =
+    LayoutInflater.from(context).inflate(resId, this, false)
+
+private val Context.locale: Locale
+    get() = ConfigurationCompat.getLocales(resources.configuration)[0]

app/src/main/java/fr/free/nrw/commons/upload/SpinnerLanguagesAdapter.kt

@@ -22,9 +22,4 @@
     tools:text="en"
     />
 
-  <View
-      android:id="@+id/view"
-      android:layout_width="match_parent"
-      android:layout_height="@dimen/tiny_height"
-      android:background="@color/item_white_background" />
 </LinearLayout>