1 files changed, 72 insertions(+), 0 deletions(-)

A app/src/main/java/kvj/taskw/ui/AppForm.kt

@@ 0,0 1,72 @@
+package kvj.taskw.ui
+
+import android.os.Bundle
+import android.os.Parcelable
+import android.support.v7.app.AlertDialog
+
+import kvj.taskw.App
+import kvj.taskw.R
+import kvj.taskw.data.Controller
+
+abstract class AppForm<T: FormData>: AppActivity() {
+    abstract val layout: Int
+
+    protected lateinit var data: T
+    protected var controller: Controller = App.controller()
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(layout)
+
+        if (!loadFromBundle(intent.extras))
+            loadFromBundle(savedInstanceState)
+    }
+
+    override fun onBackPressed() = cancel()
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        saveToBundle(outState)
+    }
+
+    private fun loadFromBundle(bundle: Bundle?): Boolean {
+        val stored = bundle?.getParcelable<T?>(App.KEY_EDIT_DATA)
+
+        stored?.let {
+            data = it
+            loadFromForm()
+        }
+
+        return stored != null
+    }
+
+    private fun saveToBundle(bundle: Bundle) {
+        saveToForm()
+        bundle.putParcelable(App.KEY_EDIT_DATA, data)
+    }
+
+    protected open fun cancel() {
+        saveToForm()
+
+        if (hasChanges()) {
+            AlertDialog.Builder(this)
+                .setMessage(R.string.form_discard_confirm)
+                .setPositiveButton(android.R.string.yes) { _, _ -> finish() }
+                .setNegativeButton(android.R.string.no, null)
+                .show()
+        } else
+            finish()
+    }
+
+    protected open fun submit() {
+        saveToForm()
+    }
+
+    protected abstract fun loadFromForm()
+    protected abstract fun saveToForm()
+    protected abstract fun hasChanges(): Boolean
+
+    protected open fun validate() = true
+}
+
+interface FormData : Parcelable