widget/PuppetWidget.h
author Doug Turner <doug.turner@gmail.com>
Tue, 03 Feb 2015 17:00:00 +0100
changeset 243715 840987c23fc597bdaad4567c2387ba1aa06c65d0
parent 239674 dcc233b91a99e7d8cfaa39b508d2eb2c2496fab6
child 245113 a6db8f54f5aa47f79302fc52f11b30694020f879
permissions -rw-r--r--
Bug 1045229 - Beacons are not associated with windows. The current window based filtering that the network monitor does will skip requests that come from sendBeacon(). Here we explictly look to see if the network channel is from beacon by looking at the loadinfo. r=dcamp, a=sledru

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=8 et :
 */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/**
 * This "puppet widget" isn't really a platform widget.  It's intended
 * to be used in widgetless rendering contexts, such as sandboxed
 * content processes.  If any "real" widgetry is needed, the request
 * is forwarded to and/or data received from elsewhere.
 */

#ifndef mozilla_widget_PuppetWidget_h__
#define mozilla_widget_PuppetWidget_h__

#include "mozilla/gfx/2D.h"
#include "mozilla/RefPtr.h"
#include "nsBaseScreen.h"
#include "nsBaseWidget.h"
#include "nsIScreenManager.h"
#include "nsThreadUtils.h"
#include "nsWeakReference.h"
#include "mozilla/Attributes.h"
#include "mozilla/EventForwards.h"

class gfxASurface;

namespace mozilla {

namespace dom {
class TabChild;
}

namespace widget {

struct AutoCacheNativeKeyCommands;

class PuppetWidget : public nsBaseWidget,
                     public nsSupportsWeakReference
{
  typedef mozilla::dom::TabChild TabChild;
  typedef mozilla::gfx::DrawTarget DrawTarget;
  typedef nsBaseWidget Base;

  // The width and height of the "widget" are clamped to this.
  static const size_t kMaxDimension;

public:
  explicit PuppetWidget(TabChild* aTabChild);

protected:
  virtual ~PuppetWidget();

public:
  NS_DECL_ISUPPORTS_INHERITED

  NS_IMETHOD Create(nsIWidget*        aParent,
                    nsNativeWidget    aNativeParent,
                    const nsIntRect&  aRect,
                    nsDeviceContext*  aContext,
                    nsWidgetInitData* aInitData = nullptr);

  void InitIMEState();

  virtual already_AddRefed<nsIWidget>
  CreateChild(const nsIntRect  &aRect,
              nsDeviceContext  *aContext,
              nsWidgetInitData *aInitData = nullptr,
              bool             aForceUseIWidgetParent = false);

  NS_IMETHOD Destroy();

  NS_IMETHOD Show(bool aState);

  virtual bool IsVisible() const
  { return mVisible; }

  NS_IMETHOD ConstrainPosition(bool     /*ignored aAllowSlop*/,
                               int32_t* aX,
                               int32_t* aY)
  { *aX = kMaxDimension;  *aY = kMaxDimension;  return NS_OK; }

  // We're always at <0, 0>, and so ignore move requests.
  NS_IMETHOD Move(double aX, double aY)
  { return NS_OK; }

  NS_IMETHOD Resize(double aWidth,
                    double aHeight,
                    bool   aRepaint);
  NS_IMETHOD Resize(double aX,
                    double aY,
                    double aWidth,
                    double aHeight,
                    bool   aRepaint)
  // (we're always at <0, 0>)
  { return Resize(aWidth, aHeight, aRepaint); }

  // XXX/cjones: copying gtk behavior here; unclear what disabling a
  // widget is supposed to entail
  NS_IMETHOD Enable(bool aState)
  { mEnabled = aState;  return NS_OK; }
  virtual bool IsEnabled() const
  { return mEnabled; }

  NS_IMETHOD SetFocus(bool aRaise = false);

  virtual nsresult ConfigureChildren(const nsTArray<Configuration>& aConfigurations);

  NS_IMETHOD Invalidate(const nsIntRect& aRect);

  // This API is going away, steer clear.
  virtual void Scroll(const nsIntPoint& aDelta,
                      const nsTArray<nsIntRect>& aDestRects,
                      const nsTArray<Configuration>& aReconfigureChildren)
  { /* dead man walking */ }

  // PuppetWidgets don't have native data, as they're purely nonnative.
  virtual void* GetNativeData(uint32_t aDataType);
  NS_IMETHOD ReparentNativeWidget(nsIWidget* aNewParent)
  { return NS_ERROR_UNEXPECTED; }

  // PuppetWidgets don't have any concept of titles. 
  NS_IMETHOD SetTitle(const nsAString& aTitle)
  { return NS_ERROR_UNEXPECTED; }
  
  // PuppetWidgets are always at <0, 0>.
  virtual nsIntPoint WidgetToScreenOffset()
  { return nsIntPoint(0, 0); }

  void InitEvent(WidgetGUIEvent& aEvent, nsIntPoint* aPoint = nullptr);

  NS_IMETHOD DispatchEvent(WidgetGUIEvent* aEvent, nsEventStatus& aStatus);

  NS_IMETHOD CaptureRollupEvents(nsIRollupListener* aListener,
                                 bool aDoCapture)
  { return NS_ERROR_UNEXPECTED; }

  NS_IMETHOD_(bool)
  ExecuteNativeKeyBinding(NativeKeyBindingsType aType,
                          const mozilla::WidgetKeyboardEvent& aEvent,
                          DoCommandCallback aCallback,
                          void* aCallbackData) MOZ_OVERRIDE;

  friend struct AutoCacheNativeKeyCommands;

  //
  // nsBaseWidget methods we override
  //

  // Documents loaded in child processes are always subdocuments of
  // other docs in an ancestor process.  To ensure that the
  // backgrounds of those documents are painted like those of
  // same-process subdocuments, we force the widget here to be
  // transparent, which in turn will cause layout to use a transparent
  // backstop background color.
  virtual nsTransparencyMode GetTransparencyMode() MOZ_OVERRIDE
  { return eTransparencyTransparent; }

  virtual LayerManager*
  GetLayerManager(PLayerTransactionChild* aShadowManager = nullptr,
                  LayersBackend aBackendHint = mozilla::layers::LayersBackend::LAYERS_NONE,
                  LayerManagerPersistence aPersistence = LAYER_MANAGER_CURRENT,
                  bool* aAllowRetaining = nullptr);

  NS_IMETHOD NotifyIME(const IMENotification& aIMENotification) MOZ_OVERRIDE;
  NS_IMETHOD_(void) SetInputContext(const InputContext& aContext,
                                    const InputContextAction& aAction);
  NS_IMETHOD_(InputContext) GetInputContext();
  virtual nsIMEUpdatePreference GetIMEUpdatePreference() MOZ_OVERRIDE;

  NS_IMETHOD SetCursor(nsCursor aCursor);
  NS_IMETHOD SetCursor(imgIContainer* aCursor,
                       uint32_t aHotspotX, uint32_t aHotspotY)
  {
    return nsBaseWidget::SetCursor(aCursor, aHotspotX, aHotspotY);
  }

  // Gets the DPI of the screen corresponding to this widget.
  // Contacts the parent process which gets the DPI from the
  // proper widget there. TODO: Handle DPI changes that happen
  // later on.
  virtual float GetDPI();
  virtual double GetDefaultScaleInternal();

  virtual bool NeedsPaint() MOZ_OVERRIDE;

  virtual TabChild* GetOwningTabChild() MOZ_OVERRIDE { return mTabChild; }
  virtual void ClearBackingScaleCache()
  {
    mDPI = -1;
    mDefaultScale = -1;
  }

protected:
  bool mEnabled;
  bool mVisible;

private:
  nsresult Paint();

  void SetChild(PuppetWidget* aChild);

  nsresult IMEEndComposition(bool aCancel);
  nsresult NotifyIMEOfFocusChange(bool aFocus);
  nsresult NotifyIMEOfSelectionChange(const IMENotification& aIMENotification);
  nsresult NotifyIMEOfUpdateComposition();
  nsresult NotifyIMEOfTextChange(const IMENotification& aIMENotification);
  nsresult NotifyIMEOfMouseButtonEvent(const IMENotification& aIMENotification);

  class PaintTask : public nsRunnable {
  public:
    NS_DECL_NSIRUNNABLE
    explicit PaintTask(PuppetWidget* widget) : mWidget(widget) {}
    void Revoke() { mWidget = nullptr; }
  private:
    PuppetWidget* mWidget;
  };

  // TabChild normally holds a strong reference to this PuppetWidget
  // or its root ancestor, but each PuppetWidget also needs a
  // reference back to TabChild (e.g. to delegate nsIWidget IME calls
  // to chrome) So we hold a weak reference to TabChild here.  Since
  // it's possible for TabChild to outlive the PuppetWidget, we clear
  // this weak reference in Destroy()
  TabChild* mTabChild;
  // The "widget" to which we delegate events if we don't have an
  // event handler.
  nsRefPtr<PuppetWidget> mChild;
  nsIntRegion mDirtyRegion;
  nsRevocableEventPtr<PaintTask> mPaintTask;
  // XXX/cjones: keeping this around until we teach LayerManager to do
  // retained-content-only transactions
  mozilla::RefPtr<DrawTarget> mDrawTarget;
  // IME
  nsIMEUpdatePreference mIMEPreferenceOfParent;
  bool mIMEComposing;
  // Latest seqno received through events
  uint32_t mIMELastReceivedSeqno;
  // Chrome's seqno value when last blur occurred
  // arriving events with seqno up to this should be discarded
  // Note that if seqno overflows (~50 days at 1 ms increment rate),
  // events will be discarded until new focus/blur occurs
  uint32_t mIMELastBlurSeqno;
  bool mNeedIMEStateInit;

  // The DPI of the screen corresponding to this widget
  float mDPI;
  double mDefaultScale;

  // Precomputed answers for ExecuteNativeKeyBinding
  bool mNativeKeyCommandsValid;
  InfallibleTArray<mozilla::CommandInt> mSingleLineCommands;
  InfallibleTArray<mozilla::CommandInt> mMultiLineCommands;
  InfallibleTArray<mozilla::CommandInt> mRichTextCommands;
};

struct AutoCacheNativeKeyCommands
{
  explicit AutoCacheNativeKeyCommands(PuppetWidget* aWidget)
    : mWidget(aWidget)
  {
    mSavedValid = mWidget->mNativeKeyCommandsValid;
    mSavedSingleLine = mWidget->mSingleLineCommands;
    mSavedMultiLine = mWidget->mMultiLineCommands;
    mSavedRichText = mWidget->mRichTextCommands;
  }

  void Cache(const InfallibleTArray<mozilla::CommandInt>& aSingleLineCommands,
             const InfallibleTArray<mozilla::CommandInt>& aMultiLineCommands,
             const InfallibleTArray<mozilla::CommandInt>& aRichTextCommands)
  {
    mWidget->mNativeKeyCommandsValid = true;
    mWidget->mSingleLineCommands = aSingleLineCommands;
    mWidget->mMultiLineCommands = aMultiLineCommands;
    mWidget->mRichTextCommands = aRichTextCommands;
  }

  void CacheNoCommands()
  {
    mWidget->mNativeKeyCommandsValid = true;
    mWidget->mSingleLineCommands.Clear();
    mWidget->mMultiLineCommands.Clear();
    mWidget->mRichTextCommands.Clear();
  }

  ~AutoCacheNativeKeyCommands()
  {
    mWidget->mNativeKeyCommandsValid = mSavedValid;
    mWidget->mSingleLineCommands = mSavedSingleLine;
    mWidget->mMultiLineCommands = mSavedMultiLine;
    mWidget->mRichTextCommands = mSavedRichText;
  }

private:
  PuppetWidget* mWidget;
  bool mSavedValid;
  InfallibleTArray<mozilla::CommandInt> mSavedSingleLine;
  InfallibleTArray<mozilla::CommandInt> mSavedMultiLine;
  InfallibleTArray<mozilla::CommandInt> mSavedRichText;
};

class PuppetScreen : public nsBaseScreen
{
public:
    explicit PuppetScreen(void* nativeScreen);
    ~PuppetScreen();

    NS_IMETHOD GetId(uint32_t* aId) MOZ_OVERRIDE;
    NS_IMETHOD GetRect(int32_t* aLeft, int32_t* aTop, int32_t* aWidth, int32_t* aHeight) MOZ_OVERRIDE;
    NS_IMETHOD GetAvailRect(int32_t* aLeft, int32_t* aTop, int32_t* aWidth, int32_t* aHeight) MOZ_OVERRIDE;
    NS_IMETHOD GetPixelDepth(int32_t* aPixelDepth) MOZ_OVERRIDE;
    NS_IMETHOD GetColorDepth(int32_t* aColorDepth) MOZ_OVERRIDE;
    NS_IMETHOD GetRotation(uint32_t* aRotation) MOZ_OVERRIDE;
    NS_IMETHOD SetRotation(uint32_t  aRotation) MOZ_OVERRIDE;
};

class PuppetScreenManager MOZ_FINAL : public nsIScreenManager
{
    ~PuppetScreenManager();

public:
    PuppetScreenManager();

    NS_DECL_ISUPPORTS
    NS_DECL_NSISCREENMANAGER

protected:
    nsCOMPtr<nsIScreen> mOneScreen;
};

}  // namespace widget
}  // namespace mozilla

#endif  // mozilla_widget_PuppetWidget_h__