iOS Chromoting Client

remoting/ios/ui/host_view_controller.mm

Index: remoting/ios/ui/host_view_controller.mm
diff --git a/remoting/ios/ui/host_view_controller.mm b/remoting/ios/ui/host_view_controller.mm
new file mode 100644
index 0000000000000000000000000000000000000000..d87e7674bdc9d29e499e1d9073299db118e45c1e
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+++ b/remoting/ios/ui/host_view_controller.mm
@@ -0,0 +1,676 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+#import "remoting/ios/ui/host_view_controller.h"
+
+#include <OpenGLES/ES2/gl.h>
+
+#import "remoting/ios/data_store.h"
+
+namespace {
+
+// TODO (aboone) Some of the layout is not yet set in stone, so variables have
+// been used to position and turn items on and off.  Eventually these may be
+// stabilized and removed.
+
+// Scroll speed multiplier for mouse wheel
+const static int kMouseWheelSensitivity = 20;
+
+// Area the navigation bar consumes when visible in pixels
+const static int kTopMargin = 20;
+// Area the footer consumes when visible (no footer currently exists)
+const static int kBottomMargin = 0;
+
+}  // namespace
+
+@interface HostViewController (Private)
+- (void)setupGL;
+- (void)tearDownGL;
+- (void)goBack;
+- (void)updateLabels;
+- (BOOL)isToolbarHidden;
+- (void)updatePanVelocityShouldCancel:(bool)canceled;
+- (void)orientationChanged:(NSNotification*)note;
+- (void)applySceneChange:(CGPoint)translation scaleBy:(float)ratio;
+- (void)showToolbar:(BOOL)visible;
+@end
+
+@implementation HostViewController
+
+@synthesize host = _host;
+@synthesize userEmail = _userEmail;
+@synthesize userAuthorizationToken = _userAuthorizationToken;
+
+// Override UIViewController
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  _context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
+  DCHECK(_context);
+  static_cast<GLKView*>(self.view).context = _context;
+
+  [_keyEntryView setDelegate:self];
+
+  _clientToHostProxy = [[HostProxy alloc] init];
+
+  // There is a 1 pixel top border which is actually the background not being
+  // covered.  There is no obvious way to remove that pixel 'border'.  Set the
+  // background clear, and also reset the backgroundimage and shawdowimage to an
+  // empty image any time the view is moved.
+  _hiddenToolbar.backgroundColor = [UIColor clearColor];
+  if ([_hiddenToolbar respondsToSelector:@selector(setBackgroundImage:
+                                                   forToolbarPosition:
+                                                           barMetrics:)]) {
+    [_hiddenToolbar setBackgroundImage:[UIImage new]
+                    forToolbarPosition:UIToolbarPositionAny
+                            barMetrics:UIBarMetricsDefault];
+  }
+  if ([_hiddenToolbar
+          respondsToSelector:@selector(setShadowImage:forToolbarPosition:)]) {
+    [_hiddenToolbar setShadowImage:[UIImage new]
+                forToolbarPosition:UIToolbarPositionAny];
+  }
+
+  // 1/2 circle rotation for an icon ~ 180 degree ~ 1 radian
+  _barBtnNavigation.imageView.transform = CGAffineTransformMakeRotation(M_PI);
+
+  _scene = [[SceneView alloc] init];
+  [_scene setMarginsFromLeft:0 right:0 top:kTopMargin bottom:kBottomMargin];
+  _desktop = [[DesktopTexture alloc] init];
+  _mouse = [[CursorTexture alloc] init];
+
+  _glBufferLock = [[NSLock alloc] init];
+  _glCursorLock = [[NSLock alloc] init];
+
+  [_scene
+      setContentSize:[Utility getOrientatedSize:self.view.bounds.size
+                         shouldWidthBeLongestSide:[Utility isInLandscapeMode]]];
+  [self showToolbar:YES];
+  [self updateLabels];
+
+  [self setupGL];
+
+  [_singleTapRecognizer requireGestureRecognizerToFail:_twoFingerTapRecognizer];
+  [_twoFingerTapRecognizer
+      requireGestureRecognizerToFail:_threeFingerTapRecognizer];
+  //[_pinchRecognizer requireGestureRecognizerToFail:_twoFingerTapRecognizer];
+  [_panRecognizer requireGestureRecognizerToFail:_singleTapRecognizer];
+  [_threeFingerPanRecognizer
+      requireGestureRecognizerToFail:_threeFingerTapRecognizer];
+  //[_pinchRecognizer requireGestureRecognizerToFail:_threeFingerPanRecognizer];
+
+  // Subscribe to changes in orientation
+  [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
+  [[NSNotificationCenter defaultCenter]
+      addObserver:self
+         selector:@selector(orientationChanged:)
+             name:UIDeviceOrientationDidChangeNotification
+           object:[UIDevice currentDevice]];
+}
+
+- (void)setupGL {
+  [EAGLContext setCurrentContext:_context];
+
+  _effect = [[GLKBaseEffect alloc] init];
+  [Utility logGLErrorCode:@"setupGL begin"];
+
+  // Initialize each texture
+  [_desktop bindToEffect:[_effect texture2d0]];
+  [_mouse bindToEffect:[_effect texture2d1]];
+  [Utility logGLErrorCode:@"setupGL textureComplete"];
+}
+
+// Override UIViewController
+- (void)viewDidUnload {
+  [super viewDidUnload];
+  [self tearDownGL];
+
+  if ([EAGLContext currentContext] == _context) {
+    [EAGLContext setCurrentContext:nil];
+  }
+  _context = nil;
+}
+
+- (void)tearDownGL {
+  [EAGLContext setCurrentContext:_context];
+
+  // Release Textures
+  [_desktop releaseTexture];
+  [_mouse releaseTexture];
+}
+
+// Override UIViewController
+- (void)viewWillAppear:(BOOL)animated {
+  [super viewWillAppear:NO];
+  [self.navigationController setNavigationBarHidden:YES animated:YES];
+  [self updateLabels];
+  if (![_clientToHostProxy isConnected]) {
+    [_busyIndicator startAnimating];
+
+    [_clientToHostProxy connectToHost:_userEmail
+                            authToken:_userAuthorizationToken
+                             jabberId:_host.jabberId
+                               hostId:_host.hostId
+                            publicKey:_host.publicKey
+                             delegate:self];
+  }
+}
+
+// Override UIViewController
+- (void)viewWillDisappear:(BOOL)animated {
+  [super viewWillDisappear:NO];
+  NSArray* viewControllers = self.navigationController.viewControllers;
+  if (viewControllers.count > 1 &&
+      [viewControllers objectAtIndex:viewControllers.count - 2] == self) {
+    // View is disappearing because a new view controller was pushed onto the
+    // stack
+  } else if ([viewControllers indexOfObject:self] == NSNotFound) {
+    // View is disappearing because it was popped from the stack
+    [_clientToHostProxy disconnectFromHost];
+  }
+}
+
+// "Back" goes to the root controller for now
+- (void)goBack {
+  [self.navigationController popToRootViewControllerAnimated:YES];
+}
+
+// @protocol PinEntryViewControllerDelegate
+// Return the PIN input by User, indicate if the User should be prompted to
+// re-enter the pin in the future
+- (void)connectToHostWithPin:(UIViewController*)controller
+                     hostPin:(NSString*)hostPin
+                shouldPrompt:(BOOL)shouldPrompt {
+  const HostPreferences* hostPrefs =
+      [[DataStore sharedStore] getHostForId:_host.hostId];
+  if (!hostPrefs) {
+    hostPrefs = [[DataStore sharedStore] createHost:_host.hostId];
+  }
+  if (hostPrefs) {
+    hostPrefs.hostPin = hostPin;
+    hostPrefs.askForPin = [NSNumber numberWithBool:shouldPrompt];
+    [[DataStore sharedStore] saveChanges];
+  }
+
+  [[controller presentingViewController] dismissViewControllerAnimated:NO
+                                                            completion:nil];
+
+  [_clientToHostProxy authenticationResponse:hostPin createPair:!shouldPrompt];
+}
+
+// @protocol PinEntryViewControllerDelegate
+// Returns if the user canceled while entering their PIN
+- (void)cancelledConnectToHostWithPin:(UIViewController*)controller {
+  [[controller presentingViewController] dismissViewControllerAnimated:NO
+                                                            completion:nil];
+
+  [self goBack];
+}
+
+- (void)setHostDetails:(Host*)host
+             userEmail:(NSString*)userEmail
+    authorizationToken:(NSString*)authorizationToken {
+  DCHECK(host.jabberId);
+  _host = host;
+  _userEmail = userEmail;
+  _userAuthorizationToken = authorizationToken;
+}
+
+// Set various labels on the form for iPad vs iPhone, and orientation
+- (void)updateLabels {
+  if (![Utility isPad] && ![Utility isInLandscapeMode]) {
+    [_barBtnDisconnect setTitle:@"" forState:(UIControlStateNormal)];
+    [_barBtnCtrlAltDel setTitle:@"CtAtD" forState:UIControlStateNormal];
+  } else {
+    [_barBtnCtrlAltDel setTitle:@"Ctrl+Alt+Del" forState:UIControlStateNormal];
+
+    NSString* hostStatus = _host.hostName;
+    if (![_statusMessage isEqual:@"Connected"]) {
+      hostStatus = [NSString
+          stringWithFormat:@"%@ - %@", _host.hostName, _statusMessage];
+    }
+    [_barBtnDisconnect setTitle:hostStatus forState:UIControlStateNormal];
+  }
+
+  [_barBtnDisconnect sizeToFit];
+  [_barBtnCtrlAltDel sizeToFit];
+}
+
+// Resize the view of the desktop - Zoom in/out.  This can occur during a Pan.
+- (IBAction)pinchGestureTriggered:(UIPinchGestureRecognizer*)sender {
+  if ([sender state] == UIGestureRecognizerStateChanged) {
+    [self applySceneChange:CGPointMake(0.0, 0.0) scaleBy:sender.scale];
+
+    sender.scale = 1.0;  // reset scale so next iteration is a relative ratio
+  }
+}
+
+- (IBAction)tapGestureTriggered:(UITapGestureRecognizer*)sender {
+  if ([_scene containsTouchPoint:[sender locationInView:self.view]]) {
+    [Utility leftClickOn:_clientToHostProxy at:_scene.mousePosition];
+  }
+}
+
+// Change position of scene.  This can occur during a pinch or longpress.
+// Or perform a Mouse Wheel Scroll
+- (IBAction)panGestureTriggered:(UIPanGestureRecognizer*)sender {
+  CGPoint translation = [sender translationInView:self.view];
+
+  // If we start with 2 touches, and the pinch gesture is not in progress yet,
+  // then disable it, so mouse scrolling and zoom do not occur at the same
+  // time.
+  if ([sender numberOfTouches] == 2 &&
+      [sender state] == UIGestureRecognizerStateBegan &&
+      !(_pinchRecognizer.state == UIGestureRecognizerStateBegan ||
+        _pinchRecognizer.state == UIGestureRecognizerStateChanged)) {
+    _pinchRecognizer.enabled = NO;
+  }
+
+  if (!_pinchRecognizer.enabled) {
+    // Began with 2 touches, so this is a scroll event
+    translation.x *= kMouseWheelSensitivity;
+    translation.y *= kMouseWheelSensitivity;
+    [Utility mouseScroll:_clientToHostProxy
+                      at:_scene.mousePosition
+                   delta:webrtc::DesktopVector(translation.x, translation.y)];
+  } else {
+    // Did not begin with 2 touches, doing a pan event
+    if ([sender state] == UIGestureRecognizerStateChanged) {
+      CGPoint translation = [sender translationInView:self.view];
+
+      [self applySceneChange:translation scaleBy:1.0];
+
+    } else if ([sender state] == UIGestureRecognizerStateEnded) {
+      // After user removes their fingers from the screen, apply an acceleration
+      // effect
+      [_scene setPanVelocity:[sender velocityInView:self.view]];
+    }
+  }
+
+  // Finished the event chain
+  if (!([sender state] == UIGestureRecognizerStateBegan ||
+        [sender state] == UIGestureRecognizerStateChanged)) {
+    _pinchRecognizer.enabled = YES;
+  }
+
+  // Reset translation so next iteration is relative.
+  [sender setTranslation:CGPointZero inView:self.view];
+}
+
+// Click-Drag mouse operation.  This can occur during a Pan.
+- (IBAction)longPressGestureTriggered:(UILongPressGestureRecognizer*)sender {
+
+  if ([sender state] == UIGestureRecognizerStateBegan) {
+    [_clientToHostProxy mouseAction:_scene.mousePosition
+                         wheelDelta:webrtc::DesktopVector(0, 0)
+                        whichButton:1
+                         buttonDown:YES];
+  } else if (!([sender state] == UIGestureRecognizerStateBegan ||
+               [sender state] == UIGestureRecognizerStateChanged)) {
+    [_clientToHostProxy mouseAction:_scene.mousePosition
+                         wheelDelta:webrtc::DesktopVector(0, 0)
+                        whichButton:1
+                         buttonDown:NO];
+  }
+}
+
+- (IBAction)twoFingerTapGestureTriggered:(UITapGestureRecognizer*)sender {
+  if ([_scene containsTouchPoint:[sender locationInView:self.view]]) {
+    [Utility rightClickOn:_clientToHostProxy at:_scene.mousePosition];
+  }
+}
+
+- (IBAction)threeFingerTapGestureTriggered:(UITapGestureRecognizer*)sender {
+
+  if ([_scene containsTouchPoint:[sender locationInView:self.view]]) {
+    [Utility middleClickOn:_clientToHostProxy at:_scene.mousePosition];
+  }
+}
+
+- (IBAction)threeFingerPanGestureTriggered:(UIPanGestureRecognizer*)sender {
+  if ([sender state] == UIGestureRecognizerStateChanged) {
+    CGPoint translation = [sender translationInView:self.view];
+    if (translation.y > 0) {
+      // Swiped down
+      [self showToolbar:YES];
+    } else if (translation.y < 0) {
+      // Swiped up
+      [_keyEntryView becomeFirstResponder];
+      [self updateLabels];
+    }
+    [sender setTranslation:CGPointZero inView:self.view];
+  }
+}
+
+- (IBAction)barBtnNavigationBackPressed:(id)sender {
+  [self goBack];
+}
+
+- (IBAction)barBtnKeyboardPressed:(id)sender {
+  if ([_keyEntryView isFirstResponder]) {
+    [_keyEntryView endEditing:NO];
+  } else {
+    [_keyEntryView becomeFirstResponder];
+  }
+
+  [self updateLabels];
+}
+
+- (IBAction)barBtnToolBarHidePressed:(id)sender {
+  [self showToolbar:[self isToolbarHidden]];  // Toolbar is either on
+                                              // screen or off screen
+}
+
+- (IBAction)barBtnCtrlAltDelPressed:(id)sender {
+  [_keyEntryView ctrlAltDel];
+}
+
+// Override UIResponder
+// When any gesture begins, remove any acceleration effects currently being
+// applied.  Example, Panning view and let it shoot off into the distance, but
+// then I see a spot I'm interested in so I will touch to capture that locations
+// focus.
+- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
+  [self updatePanVelocityShouldCancel:YES];
+  [super touchesBegan:touches withEvent:event];
+}
+
+// @protocol UIGestureRecognizerDelegate
+// Allow panning and zooming to occur simultaneously.
+// Allow panning and long press to occur simultaneously.
+// Pinch requires 2 touches, and long press requires a single touch, so they are
+// mutually exclusive regardless of if panning is the initiating gesture
+- (BOOL)gestureRecognizer:(UIGestureRecognizer*)gestureRecognizer
+    shouldRecognizeSimultaneouslyWithGestureRecognizer:
+        (UIGestureRecognizer*)otherGestureRecognizer {
+  if (gestureRecognizer == _pinchRecognizer ||
+      (gestureRecognizer == _panRecognizer)) {
+    if (otherGestureRecognizer == _pinchRecognizer ||
+        otherGestureRecognizer == _panRecognizer) {
+      return YES;
+    }
+  }
+
+  if (gestureRecognizer == _longPressRecognizer ||
+      gestureRecognizer == _panRecognizer) {
+    if (otherGestureRecognizer == _longPressRecognizer ||
+        otherGestureRecognizer == _panRecognizer) {
+      return YES;
+    }
+  }
+  return NO;
+}
+
+// @protocol ClientControllerDelegate
+// Prompt the user for their PIN if pairing has not already been established
+- (void)requestHostPin:(BOOL)pairingSupported {
+  BOOL requestPin = YES;
+  const HostPreferences* hostPrefs =
+      [[DataStore sharedStore] getHostForId:_host.hostId];
+  if (hostPrefs) {
+    requestPin = [hostPrefs.askForPin boolValue];
+    if (!requestPin) {
+      if (hostPrefs.hostPin == nil || hostPrefs.hostPin.length == 0) {
+        requestPin = YES;
+      }
+    }
+  }
+  if (requestPin == YES) {
+    PinEntryViewController* pinEntry = [[PinEntryViewController alloc] init];
+    [pinEntry setDelegate:self];
+    [pinEntry setHostName:_host.hostName];
+    [pinEntry setShouldPrompt:YES];
+    [pinEntry setPairingSupported:pairingSupported];
+
+    [self presentViewController:pinEntry animated:YES completion:nil];
+  } else {
+    [_clientToHostProxy authenticationResponse:hostPrefs.hostPin
+                                    createPair:pairingSupported];
+  }
+}
+
+// @protocol ClientControllerDelegate
+// Occurs when a connection to a HOST is established successfully
+- (void)connected {
+  // Everything is good, nothing to do
+}
+
+// @protocol ClientControllerDelegate
+- (void)connectionStatus:(NSString*)statusMessage {
+  _statusMessage = statusMessage;
+
+  if ([_statusMessage isEqual:@"Connection closed"]) {
+    [self goBack];
+  } else {
+    [self updateLabels];
+  }
+}
+
+// @protocol ClientControllerDelegate
+// Occurs when a connection to a HOST has failed
+- (void)connectionFailed:(NSString*)errorMessage {
+  [_busyIndicator stopAnimating];
+  NSString* errorMsg;
+  if ([_clientToHostProxy isConnected]) {
+    errorMsg = @"Lost Connection";
+  } else {
+    errorMsg = @"Unable to connect";
+  }
+  [Utility showAlert:errorMsg message:errorMessage];
+  [self goBack];
+}
+
+// @protocol ClientControllerDelegate
+// Copy the updated regions to a backing store to be consumed by the GL Context
+// on a different thread.  A region is stored in disjoint memory locations, and
+// must be transformed to a contiguous memory buffer for a GL Texture write.
+// /-----\
+// |  2-4|  This buffer is 5x3 bytes large, a region exists at bytes 2 to 4 and
+// |  7-9|  bytes 7 to 9.  The region is extracted to a new contiguous buffer
+// |     |  of 6 bytes in length.
+// \-----/
+// More than 1 region may exist in the frame from each call, in which case a new
+// buffer is created for each region
+- (void)applyFrame:(const webrtc::DesktopSize&)size
+            stride:(NSInteger)stride
+              data:(uint8_t*)data
+           regions:(const std::vector<webrtc::DesktopRect>&)regions {
+  [_glBufferLock lock];  // going to make changes to |_glRegions|
+
+  if (!_scene.frameSize.equals(size)) {
+    // When this is the initial frame, the busyIndicator is still spinning. Now
+    // is a good time to stop it.
+    [_busyIndicator stopAnimating];
+
+    // If the |_toolbar| is still showing, hide it.
+    [self showToolbar:NO];
+    [_scene setContentSize:
+                [Utility getOrientatedSize:self.view.bounds.size
+                    shouldWidthBeLongestSide:[Utility isInLandscapeMode]]];
+    [_scene setFrameSize:size];
+    [_desktop setTextureSize:size];
+    [_mouse setTextureSize:size];
+  }
+
+  uint32_t src_stride = stride;
+
+  for (uint32_t i = 0; i < regions.size(); i++) {
+    scoped_ptr<GLRegion> region(new GLRegion());
+
+    if (region.get()) {
+      webrtc::DesktopRect rect = regions.at(i);
+
+      webrtc::DesktopSize(rect.width(), rect.height());
+      region->offset.reset(new webrtc::DesktopVector(rect.left(), rect.top()));
+      region->image.reset(new webrtc::BasicDesktopFrame(
+          webrtc::DesktopSize(rect.width(), rect.height())));
+
+      if (region->image->data()) {
+        uint32_t bytes_per_row =
+            region->image->kBytesPerPixel * region->image->size().width();
+
+        uint32_t offset =
+            (src_stride * region->offset->y()) +                    // row
+            (region->offset->x() * region->image->kBytesPerPixel);  // column
+
+        uint8_t* src_buffer = data + offset;
+        uint8_t* dst_buffer = region->image->data();
+
+        // row by row copy
+        for (uint32_t j = 0; j < region->image->size().height(); j++) {
+          memcpy(dst_buffer, src_buffer, bytes_per_row);
+          dst_buffer += bytes_per_row;
+          src_buffer += src_stride;
+        }
+        _glRegions.push_back(region.release());
+      }
+    }
+  }
+  [_glBufferLock unlock];  // done making changes to |_glRegions|
+}
+
+// @protocol ClientControllerDelegate
+// Copy the delivered cursor to a backing store to be consumed by the GL Context
+// on a different thread.  Note only the most recent cursor is of importance,
+// discard the previous cursor.
+- (void)applyCursor:(const webrtc::DesktopSize&)size
+            hotspot:(const webrtc::DesktopVector&)hotspot
+         cursorData:(uint8_t*)data {
+
+  [_glCursorLock lock];  // going to make changes to |_cursor|
+
+  // MouseCursor takes ownership of DesktopFrame
+  [_mouse setCursor:new webrtc::MouseCursor(new webrtc::BasicDesktopFrame(size),
+                                            hotspot)];
+
+  if (_mouse.cursor.image().data()) {
+    memcpy(_mouse.cursor.image().data(),
+           data,
+           size.width() * size.height() * _mouse.cursor.image().kBytesPerPixel);
+  } else {
+    [_mouse setCursor:NULL];
+  }
+
+  [_glCursorLock unlock];  // done making changes to |_cursor|
+}
+
+// @protocol GLKViewDelegate
+// There is quite a few gotchas involved in working with this function.  For
+// sanity purposes, I've just assumed calls to the function are on a different
+// thread which I've termed GL Context.  Any variables consumed by this function
+// should be thread safe.
+//
+// Clear Screen, update desktop, update cursor, define position, and finally
+// present
+//
+// In general, avoid expensive work in this function to maximize frame rate.
+- (void)glkView:(GLKView*)view drawInRect:(CGRect)rect {
+  [self updatePanVelocityShouldCancel:NO];
+
+  // Clear to black, to give the background color
+  glClearColor(0.0, 0.0, 0.0, 1.0);
+  glClear(GL_COLOR_BUFFER_BIT);
+
+  [Utility logGLErrorCode:@"drawInRect bindBuffer"];
+
+  if (_glRegions.size() > 0 || [_desktop needDraw]) {
+    [_glBufferLock lock];
+
+    for (uint32_t i = 0; i < _glRegions.size(); i++) {
+      // |_glRegions[i].data| has been properly ordered by [self applyFrame]
+      [_desktop drawRegion:_glRegions[i] rect:rect];
+    }
+
+    _glRegions.clear();
+    [_glBufferLock unlock];
+  }
+
+  if ([_mouse needDrawAtPosition:_scene.mousePosition]) {
+    [_glCursorLock lock];
+    [_mouse drawWithMousePosition:_scene.mousePosition];
+    [_glCursorLock unlock];
+  }
+
+  [_effect transform].projectionMatrix = _scene.projectionMatrix;
+  [_effect transform].modelviewMatrix = _scene.modelViewMatrix;
+  [_effect prepareToDraw];
+
+  [Utility logGLErrorCode:@"drawInRect prepareToDrawComplete"];
+
+  [_scene draw];
+}
+
+// @protocol KeyInputDelegate
+- (void)keyboardDismissed {
+  [self updateLabels];
+}
+
+// @protocol KeyInputDelegate
+// Send keyboard input to HOST
+- (void)keyboardActionKeyCode:(uint32_t)keyPressed isKeyDown:(BOOL)keyDown {
+  [_clientToHostProxy keyboardAction:keyPressed keyDown:keyDown];
+}
+
+- (BOOL)isToolbarHidden {
+  return (_toolbar.frame.origin.y < 0);
+}
+
+// Update the scene acceleration vector
+- (void)updatePanVelocityShouldCancel:(bool)canceled {
+  if (canceled) {
+    [_scene setPanVelocity:CGPointMake(0, 0)];
+  }
+  BOOL inMotion = [_scene tickPanVelocity];
+
+  _singleTapRecognizer.enabled = !inMotion;
+  _longPressRecognizer.enabled = !inMotion;
+}
+
+- (void)applySceneChange:(CGPoint)translation scaleBy:(float)ratio {
+  [_scene panAndZoom:translation scaleBy:ratio];
+  // Notify HOST that the mouse moved
+  [Utility moveMouse:_clientToHostProxy at:_scene.mousePosition];
+}
+
+// Callback from NSNotificationCenter when the User changes orientation
+- (void)orientationChanged:(NSNotification*)note {
+  [_scene
+      setContentSize:[Utility getOrientatedSize:self.view.bounds.size
+                         shouldWidthBeLongestSide:[Utility isInLandscapeMode]]];
+  [self showToolbar:![self isToolbarHidden]];
+  [self updateLabels];
+}
+
+// Animate |_toolbar| by moving it on or offscreen
+- (void)showToolbar:(BOOL)visible {
+  CGRect frame = [_toolbar frame];
+
+  _toolBarYPosition.constant = -frame.size.height;
+  int topOffset = kTopMargin;
+
+  if (visible) {
+    topOffset += frame.size.height;
+    _toolBarYPosition.constant = kTopMargin;
+  }
+
+  _hiddenToolbarYPosition.constant = topOffset;
+  [_scene setMarginsFromLeft:0 right:0 top:topOffset bottom:kBottomMargin];
+
+  // hidden when |_toolbar| is |visible|
+  _hiddenToolbar.hidden = (visible == YES);
+
+  [UIView animateWithDuration:0.5
+      animations:^{ [self.view layoutIfNeeded]; }
+      completion:^(BOOL finished) {// Nothing to do for now
+                 }];
+
+  // Center view if needed for any reason.
+  // Specificallly, if the top anchor is active.
+  [self applySceneChange:CGPointMake(0.0, 0.0) scaleBy:1.0];
+}
+@end