Basic Sky shell for iOS targets

sky/shell/ios/sky_surface.mm

Index: sky/shell/ios/sky_surface.mm
diff --git a/sky/shell/ios/sky_surface.mm b/sky/shell/ios/sky_surface.mm
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+// Copyright 2015 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.
+
+#import "sky_surface.h"
+
+#import <QuartzCore/QuartzCore.h>
+#import <OpenGLES/EAGL.h>
+#import <OpenGLES/EAGLDrawable.h>
+
+#include "sky/shell/ui_delegate.h"
+#include "sky/shell/shell.h"
+#include "sky/shell/ios/platform_view_ios.h"
+
+#include "mojo/public/cpp/bindings/interface_request.h"
+#include "sky/services/viewport/input_event.mojom.h"
+#include "base/time/time.h"
+
+static inline sky::EventType EventTypeFromUITouchPhase(UITouchPhase phase) {
+  switch (phase) {
+    case UITouchPhaseBegan:
+      return sky::EVENT_TYPE_POINTER_DOWN;
+    case UITouchPhaseMoved:
+    case UITouchPhaseStationary:
+      // There is no EVENT_TYPE_POINTER_STATIONARY. So we just pass a move type
+      // with the same coordinates
+      return sky::EVENT_TYPE_POINTER_MOVE;
+    case UITouchPhaseEnded:
+      return sky::EVENT_TYPE_POINTER_UP;
+    case UITouchPhaseCancelled:
+      return sky::EVENT_TYPE_POINTER_CANCEL;
+  }
+
+  return sky::EVENT_TYPE_UNKNOWN;
+}
+
+@implementation SkySurface {
+  BOOL _platformViewInitialized;
+
+  sky::ViewportObserverPtr _viewport_observer;
+}
+
+- (gfx::AcceleratedWidget)acceleratedWidget {
+  return (gfx::AcceleratedWidget)self.layer;
+}
+
+- (void)layoutSubviews {
+  [super layoutSubviews];
+
+  [self configureLayerDefaults];
+
+  [self setupPlatformViewIfNecessary];
+
+  CGSize size = self.bounds.size;
+  CGFloat scale = [UIScreen mainScreen].scale;
+
+  _viewport_observer->OnViewportMetricsChanged(size.width * scale,
+                                               size.height * scale, scale);
+}
+
+- (void)configureLayerDefaults {
+  CAEAGLLayer* layer = reinterpret_cast<CAEAGLLayer*>(self.layer);
+  layer.allowsGroupOpacity = YES;
+  layer.opaque = YES;
+  CGFloat screenScale = [UIScreen mainScreen].scale;
+  layer.contentsScale = screenScale;
+  // Note: shouldRasterize is still NO. This is just a defensive measure
+  layer.rasterizationScale = screenScale;
+}
+
+- (void)setupPlatformViewIfNecessary {
+  if (_platformViewInitialized) {
+    return;
+  }
+
+  _platformViewInitialized = YES;
+
+  [self notifySurfaceCreation];
+  [self connectToViewportObserverAndLoad];
+}
+
+- (sky::shell::PlatformViewIOS*)platformView {
+  auto view = static_cast<sky::shell::PlatformViewIOS*>(
+      sky::shell::Shell::Shared().view());
+  DCHECK(view);
+  return view;
+}
+
+- (void)notifySurfaceCreation {
+  self.platformView->SurfaceCreated(self.acceleratedWidget);
+}
+
+- (NSString*)skyInitialLoadURL {
+  return [NSBundle mainBundle].infoDictionary[@"com.google.sky.load_url"];
+}
+
+- (void)connectToViewportObserverAndLoad {
+  auto view = sky::shell::Shell::Shared().view();
+  auto interface_request = mojo::GetProxy(&_viewport_observer);
+  view->ConnectToViewportObserver(interface_request.Pass());
+
+  mojo::String string(self.skyInitialLoadURL.UTF8String);
+  _viewport_observer->LoadURL(string);
+}
+
+- (void)notifySurfaceDestruction {
+  self.platformView->SurfaceDestroyed();
+}
+
+#pragma mark - UIResponder overrides for raw touches
+
+- (void)dispatchTouches:(NSSet*)touches phase:(UITouchPhase)phase {
+  auto eventType = EventTypeFromUITouchPhase(phase);
+  const CGFloat scale = [UIScreen mainScreen].scale;
+
+  for (UITouch* touch in touches) {
+    auto input = sky::InputEvent::New();
+    input->type = eventType;
+
+    auto timedelta = base::TimeDelta::FromSecondsD(touch.timestamp);
+    input->time_stamp = timedelta.InMilliseconds();
+
+    input->pointer_data = sky::PointerData::New();
+    input->pointer_data->kind = sky::POINTER_KIND_TOUCH;
+
+    CGPoint windowCoordinates = [touch locationInView:nil];
+
+    input->pointer_data->x = windowCoordinates.x * scale;
+    input->pointer_data->y = windowCoordinates.y * scale;
+
+    _viewport_observer->OnInputEvent(input.Pass());
+  }
+}
+
+- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
+  [self dispatchTouches:touches phase:UITouchPhaseBegan];
+}
+
+- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event {
+  [self dispatchTouches:touches phase:UITouchPhaseMoved];
+}
+
+- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {
+  [self dispatchTouches:touches phase:UITouchPhaseEnded];
+}
+
+- (void)touchesCancelled:(NSSet*)touches withEvent:(UIEvent*)event {
+  [self dispatchTouches:touches phase:UITouchPhaseCancelled];
+}
+
+#pragma mark - Misc.
+
++ (Class)layerClass {
+  return [CAEAGLLayer class];
+}
+
+- (void)dealloc {
+  [self notifySurfaceDestruction];
+  [super dealloc];
+}
+
+@end