Implement before unload prompt (#3508)

Author: MortimerGoro

app/src/common/shared/org/mozilla/vrbrowser/browser/PromptDelegate.java

@@ -25,6 +25,7 @@
 import org.mozilla.vrbrowser.ui.widgets.prompts.ConfirmPromptWidget;
 import org.mozilla.vrbrowser.ui.widgets.prompts.PromptWidget;
 import org.mozilla.vrbrowser.ui.widgets.prompts.TextPromptWidget;
+import org.mozilla.vrbrowser.utils.StringUtils;
 import org.mozilla.vrbrowser.utils.UrlUtils;
 
 import java.util.ArrayList;
@@ -303,6 +304,41 @@ public void dismiss() {
         });
     }
 
+    @Nullable
+    @Override
+    public GeckoResult<PromptResponse> onBeforeUnloadPrompt(@NonNull GeckoSession session, @NonNull BeforeUnloadPrompt prompt) {
+        final GeckoResult<PromptResponse> result = new GeckoResult<>();
+
+        mPrompt = new ConfirmPromptWidget(mContext);
+        mPrompt.getPlacement().parentHandle = mAttachedWindow.getHandle();
+        mPrompt.getPlacement().parentAnchorY = 0.0f;
+        mPrompt.getPlacement().translationY = WidgetPlacement.unitFromMeters(mContext, R.dimen.js_prompt_y_distance);
+        String message = mContext.getString(R.string.before_unload_prompt_message);
+        if (!StringUtils.isEmpty(prompt.title)) {
+            message = prompt.title;
+        }
+        mPrompt.setTitle(mContext.getString(R.string.before_unload_prompt_title));
+        mPrompt.setMessage(message);
+        ((ConfirmPromptWidget)mPrompt).setButtons(new String[] {
+                mContext.getResources().getText(R.string.before_unload_prompt_leave).toString(),
+                mContext.getResources().getText(R.string.before_unload_prompt_stay).toString()
+        });
+        mPrompt.setPromptDelegate(new ConfirmPromptWidget.ConfirmPromptDelegate() {
+            @Override
+            public void confirm(int index) {
+                result.complete(prompt.confirm(index == 0 ? AllowOrDeny.ALLOW : AllowOrDeny.DENY));
+            }
+
+            @Override
+            public void dismiss() {
+                result.complete(prompt.dismiss());
+            }
+        });
+        mPrompt.show(UIWidget.REQUEST_FOCUS);
+
+        return result;
+    }
+
     // WindowWidget.WindowListener
 
     @Override

app/src/common/shared/org/mozilla/vrbrowser/browser/engine/Session.java

@@ -1470,6 +1470,16 @@ public GeckoResult<PromptResponse> onFilePrompt(@NonNull GeckoSession aSession,
         return GeckoResult.fromValue(filePrompt.dismiss());
     }
 
+    @Nullable
+    @Override
+    public GeckoResult<PromptResponse> onBeforeUnloadPrompt(@NonNull GeckoSession aSession, @NonNull BeforeUnloadPrompt prompt) {
+        if (mPromptDelegate != null) {
+            return mPromptDelegate.onBeforeUnloadPrompt(aSession, prompt);
+        }
+        return GeckoResult.fromValue(prompt.dismiss());
+    }
+
+
     // MediaDelegate
 
     @Override

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

@@ -1411,6 +1411,16 @@
          '%1$s' will be replace at runtime with the app's name. -->
     <string name="not_entitled_message">%1$s does not have permission to run on this device and will now exit.</string>
 
+
+    <!-- This string is displayed in the title of an Before Unload prompt, which asks for confirmation to stay or leave the current page. -->
+    <string name="before_unload_prompt_title">Leave page?</string>
+    <!-- This string is displayed in the message of an Before Unload prompt, which asks for confirmation to stay or leave the current page. -->
+    <string name="before_unload_prompt_message">This page is asking to confirm that you want to leave. Data you have entered may not be saved.</string>
+    <!-- This string is displayed in a button of the Before Unload prompt. Clicking it cancels the navigation and stays on the same page. -->
+    <string name="before_unload_prompt_stay">Stay on Page</string>
+    <!-- This string is displayed in a button of the Before Unload prompt. Clicking it confirms the navigation and leaves the page. -->
+    <string name="before_unload_prompt_leave">Leave Page</string>
+
     <!-- This string is displayed in a button that when pressed allows a user to view a page that has been blocked from being displayed.-->
     <string name="performance_unblock_page">Unblock Page</string>
     <!-- This string is displayed as the title of a dialog displayed when poor web page performance has been detected. -->