SmartSnackbars

mobile/src/main/java/be/mygod/vpnhotspot/widget/SmartSnackbar.kt

@@ -0,0 +1,56 @@
+package be.mygod.vpnhotspot.widget
+
+import android.annotation.SuppressLint
+import android.view.View
+import android.widget.Toast
+import androidx.annotation.StringRes
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleObserver
+import androidx.lifecycle.LifecycleOwner
+import androidx.lifecycle.OnLifecycleEvent
+import be.mygod.vpnhotspot.App.Companion.app
+import com.google.android.material.snackbar.Snackbar
+
+sealed class SmartSnackbar {
+    companion object {
+        @SuppressLint("StaticFieldLeak")
+        private var holder: View? = null
+
+        fun make(@StringRes text: Int): SmartSnackbar = make(app.getText(text))
+        fun make(text: CharSequence = ""): SmartSnackbar {
+            val holder = holder
+            return if (holder == null) ToastWrapper(Toast.makeText(app, text, Toast.LENGTH_LONG)) else
+                SnackbarWrapper(Snackbar.make(holder, text, Snackbar.LENGTH_LONG))
+        }
+    }
+
+    class Register(private val view: View) : LifecycleObserver {
+        init {
+            (view.context as LifecycleOwner).lifecycle.addObserver(this)
+        }
+
+        @OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
+        fun onResume() {
+            holder = view
+        }
+        @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
+        fun onPause() {
+            if (holder === view) holder = null
+        }
+    }
+
+    abstract fun show()
+    open fun shortToast() = this
+}
+
+private class SnackbarWrapper(private val snackbar: Snackbar) : SmartSnackbar() {
+    override fun show() = snackbar.show()
+}
+
+private class ToastWrapper(private val toast: Toast) : SmartSnackbar() {
+    override fun show() {
+        app.handler.post(toast::show)
+    }
+
+    override fun shortToast() = apply { toast.duration = Toast.LENGTH_SHORT }
+}