Delete unused file

app/src/main/java/de/mm20/launcher2/ui/view/PreferencesView.kt

@@ -1,73 +0,0 @@
-package de.mm20.launcher2.ui.view
-
-import android.content.Context
-import android.os.Bundle
-import android.util.AttributeSet
-import android.view.View
-import android.widget.FrameLayout
-import androidx.annotation.XmlRes
-import androidx.appcompat.app.AppCompatActivity
-import androidx.preference.Preference
-import androidx.preference.PreferenceFragmentCompat
-import de.mm20.launcher2.R
-import de.mm20.launcher2.ktx.castTo
-
-class PreferencesView @JvmOverloads constructor(
-        context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
-) : FrameLayout(context, attrs, defStyleAttr) {
-
-    private val fragment = PreferenceViewFragment()
-
-    init {
-        if (id == View.NO_ID) id = View.generateViewId()
-        context.castTo<AppCompatActivity>().supportFragmentManager.beginTransaction()
-                .add(id, fragment)
-                .commit()
-        attrs?.let {
-            val ta = context.theme.obtainStyledAttributes(it, R.styleable.PreferencesView, 0, defStyleAttr)
-            val preferenceScreen = ta.getResourceId(R.styleable.SearchGridView_columnCount, 0)
-            setPreferenceResource(preferenceScreen)
-            ta.recycle()
-        }
-    }
-
-    fun setPreferenceResource(@XmlRes resId: Int) {
-        if (resId == 0) return
-        fragment.setPreferenceResource(resId)
-    }
-
-    fun <T : Preference> findPreference(key: String): T? {
-        return fragment.findPreference<T>(key)
-    }
-
-    var onPreferencesReady: (() -> Unit)? = null
-        set(value) {
-            field = value
-            fragment.onPreferencesReady = value
-        }
-
-}
-
-class PreferenceViewFragment : PreferenceFragmentCompat() {
-
-    private var isInitialized = false
-    var onPreferencesReady: (() -> Unit)? = null
-
-    @XmlRes
-    private var preferenceResource = 0
-
-    override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
-        if (preferenceResource != 0) addPreferencesFromResource(preferenceResource)
-        isInitialized = true
-        onPreferencesReady?.invoke()
-        onPreferencesReady = null
-    }
-
-    internal fun setPreferenceResource(@XmlRes resId: Int) {
-        preferenceResource = resId
-        if (isInitialized && resId != 0) {
-            addPreferencesFromResource(resId)
-        }
-    }
-
-}