Fixes #21 : unwanted back provokes data loss

app/src/main/java/net/pokeranalytics/android/ui/modules/handhistory/HandHistoryActivity.kt

@@ -1,14 +1,15 @@
 package net.pokeranalytics.android.ui.modules.handhistory
 
+import android.content.DialogInterface
 import android.content.Intent
 import android.os.Bundle
+import androidx.appcompat.app.AlertDialog
 import androidx.fragment.app.Fragment
 import net.pokeranalytics.android.R
 import net.pokeranalytics.android.model.realm.Session
 import net.pokeranalytics.android.ui.activity.components.BaseActivity
 import net.pokeranalytics.android.ui.activity.components.RequestCode
-import net.pokeranalytics.android.ui.modules.handhistory.evaluator.Hand
-import timber.log.Timber
+
 
 class HandHistoryActivity : BaseActivity() {
 
@@ -18,6 +19,8 @@ class HandHistoryActivity : BaseActivity() {
 		ATTACHED("attached")
 	}
 
+	private var fragment: HandHistoryFragment? = null
+
 	companion object {
 
 		fun newInstance(fragment: Fragment, session: Session, attached: Boolean) {
@@ -57,18 +60,31 @@ class HandHistoryActivity : BaseActivity() {
 		fragmentTransaction.add(R.id.container, fragment)
 		fragmentTransaction.commit()
 
-//		test()
-
+		this.fragment = fragment
 	}
 
-	fun test() {
+	override fun onBackPressed() {
+
+		var shouldShowDataLossWarning = false
+		this.fragment?.let { hhFragment ->
+			if (hhFragment.isEditing) {
+				shouldShowDataLossWarning = true
+			}
+		}
+
+		if (shouldShowDataLossWarning) {
 
-		val h1 = Hand.fromString("Kd Ts Jc Ah Qc")
-		val h2 = Hand.fromString("Kd 5d Jd Ad Qd")
-		val r1 = Hand.evaluate(h1)
-		val r2 = Hand.evaluate(h2)
-		Timber.d(">>> Hand evaluation = $r1")
-		Timber.d(">>> Hand evaluation = $r2")
+			AlertDialog.Builder(this)
+				.setIcon(android.R.drawable.ic_dialog_alert)
+				.setTitle(R.string.your_attention)
+				.setMessage(R.string.data_loss_warning)
+				.setPositiveButton(R.string.yes) { _, _ -> finish() }
+				.setNegativeButton(R.string.no, null)
+				.show()
+
+		} else {
+			super.onBackPressed()
+		}
 
 	}
 

app/src/main/java/net/pokeranalytics/android/ui/modules/handhistory/HandHistoryFragment.kt

@@ -60,6 +60,11 @@ class HandHistoryFragment : RealmFragment(), RowRepresentableDelegate, KeyboardL
 	 */
 	private var menu: Menu? = null
 
+	val isEditing: Boolean
+		get() {
+			return this.model.isEdited
+		}
+
 	companion object {
 
 		fun newInstance(id: String? = null, configurationId: String? = null, attached: Boolean = false): HandHistoryFragment {

app/src/main/res/values/strings.xml

@@ -799,5 +799,6 @@
     <string name="text">Text</string>
     <string name="hh_player_setting">tap to set player, hand or stack</string>
     <string name="board">board</string>
+    <string name="data_loss_warning">All unsaved changes will be lost. Do you really want to continue?</string>
 
 </resources>