syncslides: Integrating the new back button event with the app.
Closes: https://github.com/vanadium/syncslides/issues/2
Change-Id: I5cd3fc6f5a1d9fc836160b8de7157da5241886a5
diff --git a/dart/lib/main.dart b/dart/lib/main.dart
index 85e2522..6ef619e 100644
--- a/dart/lib/main.dart
+++ b/dart/lib/main.dart
@@ -7,14 +7,25 @@
import 'styles/common.dart' as style;
import 'components/deckgrid.dart';
+import 'utils/back_button.dart' as backButtonUtil;
+
+NavigatorState _navigator;
void main() {
_initLogging();
+ _initBackButtonHandler();
runApp(new MaterialApp(
theme: style.theme,
title: 'SyncSlides',
- routes: {'/': (RouteArguments args) => new DeckGridPage()}));
+ routes: {'/': (RouteArguments args) => new LandingPage()}));
+}
+
+class LandingPage extends StatelessComponent {
+ Widget build(BuildContext context) {
+ _navigator = Navigator.of(context);
+ return new DeckGridPage();
+ }
}
void _initLogging() {
@@ -23,3 +34,15 @@
print('\nSyncSlides: ${rec.time}: ${rec.message}');
});
}
+
+void _initBackButtonHandler() {
+ backButtonUtil.onBackButton(() {
+ if (_navigator != null && _navigator.hasPreviousRoute) {
+ _navigator.pop();
+ return true;
+ }
+
+ // Tell the app to exit.
+ return false;
+ });
+}
diff --git a/dart/lib/utils/back_button.dart b/dart/lib/utils/back_button.dart
new file mode 100644
index 0000000..9df68c2
--- /dev/null
+++ b/dart/lib/utils/back_button.dart
@@ -0,0 +1,40 @@
+// Copyright 2015 The Vanadium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+import 'package:flutter/services.dart' show shell;
+import 'package:mojo_services/input/input.mojom.dart';
+
+String _inputMojoUrl = 'mojo:input';
+
+typedef bool BackButtonHandler();
+
+BackButtonHandler _handler;
+// Registers a handler for the back button.
+// Handler should return false when it no longer wants to control
+// the behaviour of the back button, in which case the app will exit.
+void onBackButton(BackButtonHandler handler) {
+ if (_handler != null) {
+ throw new ArgumentError("Only one back button handler can exist per app.");
+ }
+
+ InputServiceProxy inputService = new InputServiceProxy.unbound();
+ shell.connectToService(_inputMojoUrl, inputService);
+
+ InputClientStub intputClientStub = new InputClientStub.unbound();
+ intputClientStub.impl = new _InputHandler();
+
+ inputService.ptr.setClient(intputClientStub);
+ _handler = handler;
+}
+
+class _InputHandler extends InputClient {
+ dynamic onBackButton([Function responseFactory]) {
+ bool exit = !_handler();
+ if (exit) {
+ return null;
+ } else {
+ return responseFactory();
+ }
+ }
+}
diff --git a/dart/pubspec.yaml b/dart/pubspec.yaml
index 45a372b..86d198c 100644
--- a/dart/pubspec.yaml
+++ b/dart/pubspec.yaml
@@ -4,6 +4,7 @@
flutter:
path: "../../../../../flutter/packages/flutter"
logging: ">=0.11.2 <0.12.0"
+ mojo_services: ">=0.4.5 <0.5.0"
syncbase: ">=0.0.9 <0.1.0"
v23discovery: ">=0.0.4 < 0.1.0"
uuid: ">=0.5.0 <0.6.0"
