// Copyright (c) 2012 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.

#include "content/browser/renderer_host/render_widget_host_view_base.h"

#include "base/logging.h"
#include "build/build_config.h"
#include "content/browser/accessibility/browser_accessibility_manager.h"
#include "content/browser/gpu/gpu_data_manager_impl.h"
#include "content/browser/renderer_host/input/synthetic_gesture_target_base.h"
#include "content/browser/renderer_host/render_process_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_delegate.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_view_base_observer.h"
#include "content/common/content_switches_internal.h"
#include "content/public/browser/render_widget_host_view_frame_subscriber.h"
#include "ui/gfx/display.h"
#include "ui/gfx/geometry/point_conversions.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/gfx/geometry/size_f.h"
#include "ui/gfx/screen.h"

namespace content {

namespace {

// How many microseconds apart input events should be flushed.
const int kFlushInputRateInUs = 16666;

}

RenderWidgetHostViewBase::RenderWidgetHostViewBase()
    : popup_type_(blink::WebPopupTypeNone),
      background_color_(SK_ColorWHITE),
      mouse_locked_(false),
      showing_context_menu_(false),
      selection_text_offset_(0),
      selection_range_(gfx::Range::InvalidRange()),
      current_device_scale_factor_(0),
      current_display_rotation_(gfx::Display::ROTATE_0),
      pinch_zoom_enabled_(content::IsPinchToZoomEnabled()),
      renderer_frame_number_(0),
      weak_factory_(this) {}

RenderWidgetHostViewBase::~RenderWidgetHostViewBase() {
  DCHECK(!mouse_locked_);
  // We call this here to guarantee that observers are notified before we go
  // away. However, some subclasses may wish to call this earlier in their
  // shutdown process, e.g. to force removal from
  // RenderWidgetHostInputEventRouter's surface map before relinquishing a
  // host pointer, as in RenderWidgetHostViewGuest. There is no harm in calling
  // NotifyObserversAboutShutdown() twice, as the observers are required to
  // de-register on the first call, and so the second call does nothing.
  NotifyObserversAboutShutdown();
}

void RenderWidgetHostViewBase::NotifyObserversAboutShutdown() {
  // Note: RenderWidgetHostInputEventRouter is an observer, and uses the
  // following notification to remove this view from its surface owners map.
  FOR_EACH_OBSERVER(RenderWidgetHostViewBaseObserver,
                    observers_,
                    OnRenderWidgetHostViewBaseDestroyed(this));
  // All observers are required to disconnect after they are notified.
  DCHECK(!observers_.might_have_observers());
}

bool RenderWidgetHostViewBase::OnMessageReceived(const IPC::Message& msg){
  return false;
}

void RenderWidgetHostViewBase::SetBackgroundColor(SkColor color) {
  background_color_ = color;
}

void RenderWidgetHostViewBase::SetBackgroundColorToDefault() {
  SetBackgroundColor(SK_ColorWHITE);
}

bool RenderWidgetHostViewBase::GetBackgroundOpaque() {
  return SkColorGetA(background_color_) == SK_AlphaOPAQUE;
}

gfx::Size RenderWidgetHostViewBase::GetPhysicalBackingSize() const {
  gfx::Display display =
      gfx::Screen::GetScreen()->GetDisplayNearestWindow(GetNativeView());
  return gfx::ScaleToCeiledSize(GetRequestedRendererSize(),
                                display.device_scale_factor());
}

bool RenderWidgetHostViewBase::DoTopControlsShrinkBlinkSize() const {
  return false;
}

float RenderWidgetHostViewBase::GetTopControlsHeight() const {
  return 0.f;
}

void RenderWidgetHostViewBase::SelectionChanged(const base::string16& text,
                                                size_t offset,
                                                const gfx::Range& range) {
  selection_text_ = text;
  selection_text_offset_ = offset;
  selection_range_.set_start(range.start());
  selection_range_.set_end(range.end());
}

gfx::Size RenderWidgetHostViewBase::GetRequestedRendererSize() const {
  return GetViewBounds().size();
}

ui::TextInputClient* RenderWidgetHostViewBase::GetTextInputClient() {
  NOTREACHED();
  return NULL;
}

bool RenderWidgetHostViewBase::IsShowingContextMenu() const {
  return showing_context_menu_;
}

void RenderWidgetHostViewBase::SetShowingContextMenu(bool showing) {
  DCHECK_NE(showing_context_menu_, showing);
  showing_context_menu_ = showing;
}

base::string16 RenderWidgetHostViewBase::GetSelectedText() const {
  if (!selection_range_.IsValid())
    return base::string16();
  return selection_text_.substr(
      selection_range_.GetMin() - selection_text_offset_,
      selection_range_.length());
}

bool RenderWidgetHostViewBase::IsMouseLocked() {
  return mouse_locked_;
}

InputEventAckState RenderWidgetHostViewBase::FilterInputEvent(
    const blink::WebInputEvent& input_event) {
  // By default, input events are simply forwarded to the renderer.
  return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
}

void RenderWidgetHostViewBase::OnSetNeedsFlushInput() {
  if (flush_input_timer_.IsRunning())
    return;

  flush_input_timer_.Start(
      FROM_HERE,
      base::TimeDelta::FromMicroseconds(kFlushInputRateInUs),
      this,
      &RenderWidgetHostViewBase::FlushInput);
}

void RenderWidgetHostViewBase::WheelEventAck(
    const blink::WebMouseWheelEvent& event,
    InputEventAckState ack_result) {
}

void RenderWidgetHostViewBase::GestureEventAck(
    const blink::WebGestureEvent& event,
    InputEventAckState ack_result) {
}

void RenderWidgetHostViewBase::SetPopupType(blink::WebPopupType popup_type) {
  popup_type_ = popup_type;
}

blink::WebPopupType RenderWidgetHostViewBase::GetPopupType() {
  return popup_type_;
}

BrowserAccessibilityManager*
RenderWidgetHostViewBase::CreateBrowserAccessibilityManager(
    BrowserAccessibilityDelegate* delegate, bool for_root_frame) {
  NOTREACHED();
  return NULL;
}

void RenderWidgetHostViewBase::AccessibilityShowMenu(const gfx::Point& point) {
  RenderWidgetHostImpl* impl = NULL;
  if (GetRenderWidgetHost())
    impl = RenderWidgetHostImpl::From(GetRenderWidgetHost());

  if (impl)
    impl->ShowContextMenuAtPoint(point);
}

gfx::Point RenderWidgetHostViewBase::AccessibilityOriginInScreen(
    const gfx::Rect& bounds) {
  return bounds.origin();
}

gfx::AcceleratedWidget
    RenderWidgetHostViewBase::AccessibilityGetAcceleratedWidget() {
  return gfx::kNullAcceleratedWidget;
}

gfx::NativeViewAccessible
    RenderWidgetHostViewBase::AccessibilityGetNativeViewAccessible() {
  return NULL;
}

void RenderWidgetHostViewBase::UpdateScreenInfo(gfx::NativeView view) {
  RenderWidgetHostImpl* impl = NULL;
  if (GetRenderWidgetHost())
    impl = RenderWidgetHostImpl::From(GetRenderWidgetHost());

  if (impl)
    impl->delegate()->SendScreenRects();

  if (HasDisplayPropertyChanged(view) && impl)
    impl->NotifyScreenInfoChanged();
}

bool RenderWidgetHostViewBase::HasDisplayPropertyChanged(gfx::NativeView view) {
  gfx::Display display =
      gfx::Screen::GetScreen()->GetDisplayNearestWindow(view);
  if (current_display_area_ == display.work_area() &&
      current_device_scale_factor_ == display.device_scale_factor() &&
      current_display_rotation_ == display.rotation()) {
    return false;
  }

  current_display_area_ = display.work_area();
  current_device_scale_factor_ = display.device_scale_factor();
  current_display_rotation_ = display.rotation();
  return true;
}

base::WeakPtr<RenderWidgetHostViewBase> RenderWidgetHostViewBase::GetWeakPtr() {
  return weak_factory_.GetWeakPtr();
}

scoped_ptr<SyntheticGestureTarget>
RenderWidgetHostViewBase::CreateSyntheticGestureTarget() {
  RenderWidgetHostImpl* host =
      RenderWidgetHostImpl::From(GetRenderWidgetHost());
  return scoped_ptr<SyntheticGestureTarget>(
      new SyntheticGestureTargetBase(host));
}

// Base implementation is unimplemented.
void RenderWidgetHostViewBase::BeginFrameSubscription(
    scoped_ptr<RenderWidgetHostViewFrameSubscriber> subscriber) {
  NOTREACHED();
}

void RenderWidgetHostViewBase::EndFrameSubscription() {
  NOTREACHED();
}

uint32_t RenderWidgetHostViewBase::RendererFrameNumber() {
  return renderer_frame_number_;
}

void RenderWidgetHostViewBase::DidReceiveRendererFrame() {
  ++renderer_frame_number_;
}

void RenderWidgetHostViewBase::FlushInput() {
  RenderWidgetHostImpl* impl = NULL;
  if (GetRenderWidgetHost())
    impl = RenderWidgetHostImpl::From(GetRenderWidgetHost());
  if (!impl)
    return;
  impl->FlushInput();
}

void RenderWidgetHostViewBase::OnTextSurroundingSelectionResponse(
    const base::string16& content,
    size_t start_offset,
    size_t end_offset) {
  NOTIMPLEMENTED();
}

void RenderWidgetHostViewBase::ShowDisambiguationPopup(
    const gfx::Rect& rect_pixels,
    const SkBitmap& zoomed_bitmap) {
  NOTIMPLEMENTED();
}

gfx::Size RenderWidgetHostViewBase::GetVisibleViewportSize() const {
  return GetViewBounds().size();
}

void RenderWidgetHostViewBase::SetInsets(const gfx::Insets& insets) {
  NOTIMPLEMENTED();
}

// static
blink::WebScreenOrientationType
RenderWidgetHostViewBase::GetOrientationTypeForMobile(
    const gfx::Display& display) {
  int angle = display.RotationAsDegree();
  const gfx::Rect& bounds = display.bounds();

  // Whether the device's natural orientation is portrait.
  bool natural_portrait = false;
  if (angle == 0 || angle == 180) // The device is in its natural orientation.
    natural_portrait = bounds.height() >= bounds.width();
  else
    natural_portrait = bounds.height() <= bounds.width();

  switch (angle) {
  case 0:
    return natural_portrait ? blink::WebScreenOrientationPortraitPrimary
                           : blink::WebScreenOrientationLandscapePrimary;
  case 90:
    return natural_portrait ? blink::WebScreenOrientationLandscapePrimary
                           : blink::WebScreenOrientationPortraitSecondary;
  case 180:
    return natural_portrait ? blink::WebScreenOrientationPortraitSecondary
                           : blink::WebScreenOrientationLandscapeSecondary;
  case 270:
    return natural_portrait ? blink::WebScreenOrientationLandscapeSecondary
                           : blink::WebScreenOrientationPortraitPrimary;
  default:
    NOTREACHED();
    return blink::WebScreenOrientationPortraitPrimary;
  }
}

// static
blink::WebScreenOrientationType
RenderWidgetHostViewBase::GetOrientationTypeForDesktop(
    const gfx::Display& display) {
  static int primary_landscape_angle = -1;
  static int primary_portrait_angle = -1;

  int angle = display.RotationAsDegree();
  const gfx::Rect& bounds = display.bounds();
  bool is_portrait = bounds.height() >= bounds.width();

  if (is_portrait && primary_portrait_angle == -1)
    primary_portrait_angle = angle;

  if (!is_portrait && primary_landscape_angle == -1)
    primary_landscape_angle = angle;

  if (is_portrait) {
    return primary_portrait_angle == angle
        ? blink::WebScreenOrientationPortraitPrimary
        : blink::WebScreenOrientationPortraitSecondary;
  }

  return primary_landscape_angle == angle
      ? blink::WebScreenOrientationLandscapePrimary
      : blink::WebScreenOrientationLandscapeSecondary;
}

void RenderWidgetHostViewBase::OnDidNavigateMainFrameToNewPage() {
}

uint32_t RenderWidgetHostViewBase::GetSurfaceIdNamespace() {
  return 0;
}

uint32_t RenderWidgetHostViewBase::SurfaceIdNamespaceAtPoint(
    cc::SurfaceHittestDelegate* delegate,
    const gfx::Point& point,
    gfx::Point* transformed_point) {
  NOTREACHED();
  return 0;
}

gfx::Point RenderWidgetHostViewBase::TransformPointToRootCoordSpace(
    const gfx::Point& point) {
  return point;
}

gfx::PointF RenderWidgetHostViewBase::TransformPointToRootCoordSpaceF(
    const gfx::PointF& point) {
  return gfx::PointF(TransformPointToRootCoordSpace(
      gfx::ToRoundedPoint(point)));
}

void RenderWidgetHostViewBase::TransformPointToLocalCoordSpace(
    const gfx::Point& point,
    cc::SurfaceId original_surface,
    gfx::Point* transformed_point) {
  *transformed_point = point;
}

void RenderWidgetHostViewBase::AddObserver(
    RenderWidgetHostViewBaseObserver* observer) {
  observers_.AddObserver(observer);
}

void RenderWidgetHostViewBase::RemoveObserver(
    RenderWidgetHostViewBaseObserver* observer) {
  observers_.RemoveObserver(observer);
}

cc::SurfaceId RenderWidgetHostViewBase::SurfaceIdForTesting() const {
  return cc::SurfaceId();
}

}  // namespace content