widget/PuppetWidget.h
author Chris H-C <chutten@mozilla.com>
Mon, 04 Jul 2016 11:16:05 -0400
changeset 312997 df28918fe2361f0b54ca9ce4773a29c4c0675d06
parent 311806 a2aece29443753914c3e6da9ad98c44045bda0ca
child 314336 cfcd8c4f3a36b958002010a9c6d461a7769996d5
permissions -rw-r--r--
bug 1218576 - Support remote accumulation via JS histograms. r=gfritzsche The JS histograms, too, need to dispatch their accumulations from child to parent. JSHistograms_Add now only supports histograms that are in gHistogramsMap or that were created in the parent process. After bug 1288745, maybe we'll be able to change this to be less convoluted. MozReview-Commit-ID: 3qTH89YKbGP

/* -*- 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 "nsCOMArray.h"
#include "nsIKeyEventInPluginCallback.h"
#include "nsIScreenManager.h"
#include "nsThreadUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/ContentCache.h"
#include "mozilla/EventForwards.h"

namespace mozilla {

namespace dom {
class TabChild;
} // namespace dom

namespace widget {

struct AutoCacheNativeKeyCommands;

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

  // 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

  // PuppetWidget creation is infallible, hence InfallibleCreate(), which
  // Create() calls.
  using nsBaseWidget::Create; // for Create signature not overridden here
  virtual nsresult Create(nsIWidget* aParent,
                          nsNativeWidget aNativeParent,
                          const LayoutDeviceIntRect& aRect,
                          nsWidgetInitData* aInitData = nullptr)
                          override;
  void InfallibleCreate(nsIWidget* aParent,
                        nsNativeWidget aNativeParent,
                        const LayoutDeviceIntRect& aRect,
                        nsWidgetInitData* aInitData = nullptr);

  void InitIMEState();

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

  virtual void Destroy() override;

  NS_IMETHOD Show(bool aState) override;

  virtual bool IsVisible() const override
  { return mVisible; }

  virtual void ConstrainPosition(bool     /*ignored aAllowSlop*/,
                                 int32_t* aX,
                                 int32_t* aY) override
  { *aX = kMaxDimension; *aY = kMaxDimension; }

  // Widget position is controlled by the parent process via TabChild.
  NS_IMETHOD Move(double aX, double aY) override
  { return NS_OK; }

  NS_IMETHOD Resize(double aWidth,
                    double aHeight,
                    bool   aRepaint) override;
  NS_IMETHOD Resize(double aX,
                    double aY,
                    double aWidth,
                    double aHeight,
                    bool   aRepaint) override
  {
    if (mBounds.x != aX || mBounds.y != aY) {
      NotifyWindowMoved(aX, aY);
    }
    mBounds.x = aX;
    mBounds.y = aY;
    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) override
  { mEnabled = aState;  return NS_OK; }
  virtual bool IsEnabled() const override
  { return mEnabled; }

  NS_IMETHOD SetFocus(bool aRaise = false) override;

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

  NS_IMETHOD Invalidate(const LayoutDeviceIntRect& aRect) override;

  // PuppetWidgets don't have native data, as they're purely nonnative.
  virtual void* GetNativeData(uint32_t aDataType) override;
#if defined(XP_WIN)
  void SetNativeData(uint32_t aDataType, uintptr_t aVal) override;
#endif

  // PuppetWidgets don't have any concept of titles.
  NS_IMETHOD SetTitle(const nsAString& aTitle) override
  { return NS_ERROR_UNEXPECTED; }

  virtual LayoutDeviceIntPoint WidgetToScreenOffset() override
  { return LayoutDeviceIntPoint::FromUnknownPoint(GetWindowPosition() + GetChromeDimensions()); }

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

  NS_IMETHOD DispatchEvent(WidgetGUIEvent* aEvent, nsEventStatus& aStatus) override;
  nsEventStatus DispatchInputEvent(WidgetInputEvent* aEvent) override;
  void SetConfirmedTargetAPZC(uint64_t aInputBlockId,
                              const nsTArray<ScrollableLayerGuid>& aTargets) const override;
  void UpdateZoomConstraints(const uint32_t& aPresShellId,
                             const FrameMetrics::ViewID& aViewId,
                             const mozilla::Maybe<ZoomConstraints>& aConstraints) override;
  bool AsyncPanZoomEnabled() const override;

  NS_IMETHOD_(bool)
  ExecuteNativeKeyBinding(NativeKeyBindingsType aType,
                          const mozilla::WidgetKeyboardEvent& aEvent,
                          DoCommandCallback aCallback,
                          void* aCallbackData) 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() override
  { return eTransparencyTransparent; }

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

  NS_IMETHOD_(void) SetInputContext(const InputContext& aContext,
                                    const InputContextAction& aAction) override;
  NS_IMETHOD_(InputContext) GetInputContext() override;
  NS_IMETHOD_(NativeIMEContext) GetNativeIMEContext() override;
  virtual nsIMEUpdatePreference GetIMEUpdatePreference() override;

  NS_IMETHOD SetCursor(nsCursor aCursor) override;
  NS_IMETHOD SetCursor(imgIContainer* aCursor,
                       uint32_t aHotspotX, uint32_t aHotspotY) override;

  virtual void ClearCachedCursor() override;

  // 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() override;
  virtual double GetDefaultScaleInternal() override;

  virtual bool NeedsPaint() override;

  virtual TabChild* GetOwningTabChild() override { return mTabChild; }

  void UpdateBackingScaleCache(float aDpi, double aScale)
  {
    mDPI = aDpi;
    mDefaultScale = aScale;
  }

  nsIntSize GetScreenDimensions();

  // Get the size of the chrome of the window that this tab belongs to.
  nsIntPoint GetChromeDimensions();

  // Get the screen position of the application window.
  nsIntPoint GetWindowPosition();

  virtual LayoutDeviceIntRect GetScreenBounds() override;

  NS_IMETHOD StartPluginIME(const mozilla::WidgetKeyboardEvent& aKeyboardEvent,
                            int32_t aPanelX, int32_t aPanelY,
                            nsString& aCommitted) override;

  virtual void SetPluginFocused(bool& aFocused) override;
  virtual void DefaultProcOfPluginEvent(
                 const mozilla::WidgetPluginEvent& aEvent) override;

  virtual nsresult SynthesizeNativeKeyEvent(int32_t aNativeKeyboardLayout,
                                            int32_t aNativeKeyCode,
                                            uint32_t aModifierFlags,
                                            const nsAString& aCharacters,
                                            const nsAString& aUnmodifiedCharacters,
                                            nsIObserver* aObserver) override;
  virtual nsresult SynthesizeNativeMouseEvent(LayoutDeviceIntPoint aPoint,
                                              uint32_t aNativeMessage,
                                              uint32_t aModifierFlags,
                                              nsIObserver* aObserver) override;
  virtual nsresult SynthesizeNativeMouseMove(LayoutDeviceIntPoint aPoint,
                                             nsIObserver* aObserver) override;
  virtual nsresult SynthesizeNativeMouseScrollEvent(LayoutDeviceIntPoint aPoint,
                                                    uint32_t aNativeMessage,
                                                    double aDeltaX,
                                                    double aDeltaY,
                                                    double aDeltaZ,
                                                    uint32_t aModifierFlags,
                                                    uint32_t aAdditionalFlags,
                                                    nsIObserver* aObserver) override;
  virtual nsresult SynthesizeNativeTouchPoint(uint32_t aPointerId,
                                              TouchPointerState aPointerState,
                                              LayoutDeviceIntPoint aPoint,
                                              double aPointerPressure,
                                              uint32_t aPointerOrientation,
                                              nsIObserver* aObserver) override;
  virtual nsresult SynthesizeNativeTouchTap(LayoutDeviceIntPoint aPoint,
                                            bool aLongTap,
                                            nsIObserver* aObserver) override;
  virtual nsresult ClearNativeTouchSequence(nsIObserver* aObserver) override;
  virtual uint32_t GetMaxTouchPoints() const override;

  virtual void StartAsyncScrollbarDrag(const AsyncDragMetrics& aDragMetrics) override;

  virtual void SetCandidateWindowForPlugin(
                 const CandidateWindowPosition& aPosition) override;

  virtual void ZoomToRect(const uint32_t& aPresShellId,
                          const FrameMetrics::ViewID& aViewId,
                          const CSSRect& aRect,
                          const uint32_t& aFlags) override;

  virtual bool HasPendingInputEvent() override;

  void HandledWindowedPluginKeyEvent(const NativeEventData& aKeyEventData,
                                     bool aIsConsumed);
  virtual nsresult OnWindowedPluginKeyEvent(
                     const NativeEventData& aKeyEventData,
                     nsIKeyEventInPluginCallback* aCallback) override;

  virtual void LookUpDictionary(
                 const nsAString& aText,
                 const nsTArray<mozilla::FontRange>& aFontRangeArray,
                 const bool aIsVertical,
                 const LayoutDeviceIntPoint& aPoint) override;

protected:
  virtual nsresult NotifyIMEInternal(
                     const IMENotification& aIMENotification) override;

private:
  nsresult Paint();

  void SetChild(PuppetWidget* aChild);

  nsresult RequestIMEToCommitComposition(bool aCancel);
  nsresult NotifyIMEOfFocusChange(const IMENotification& aIMENotification);
  nsresult NotifyIMEOfSelectionChange(const IMENotification& aIMENotification);
  nsresult NotifyIMEOfCompositionUpdate(const IMENotification& aIMENotification);
  nsresult NotifyIMEOfTextChange(const IMENotification& aIMENotification);
  nsresult NotifyIMEOfMouseButtonEvent(const IMENotification& aIMENotification);
  nsresult NotifyIMEOfPositionChange(const IMENotification& aIMENotification);

  bool CacheEditorRect();
  bool CacheCompositionRects(uint32_t& aStartOffset,
                             nsTArray<LayoutDeviceIntRect>& aRectArray,
                             uint32_t& aTargetCauseOffset);
  bool GetCaretRect(LayoutDeviceIntRect& aCaretRect, uint32_t aCaretOffset);
  uint32_t GetCaretOffset();

  nsIWidgetListener* GetCurrentWidgetListener();

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

  class MemoryPressureObserver : public nsIObserver {
  public:
    NS_DECL_ISUPPORTS
    NS_DECL_NSIOBSERVER
    explicit MemoryPressureObserver(PuppetWidget* aWidget) : mWidget(aWidget) {}
    void Remove();
  private:
    virtual ~MemoryPressureObserver() {}
    PuppetWidget* mWidget;
  };
  friend class MemoryPressureObserver;

  // 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.
  RefPtr<PuppetWidget> mChild;
  LayoutDeviceIntRegion mDirtyRegion;
  nsRevocableEventPtr<PaintTask> mPaintTask;
  RefPtr<MemoryPressureObserver> mMemoryPressureObserver;
  // XXX/cjones: keeping this around until we teach LayerManager to do
  // retained-content-only transactions
  RefPtr<DrawTarget> mDrawTarget;
  // IME
  nsIMEUpdatePreference mIMEPreferenceOfParent;
  InputContext mInputContext;
  // mNativeIMEContext is initialized when this dispatches every composition
  // event both from parent process's widget and TextEventDispatcher in same
  // process.  If it hasn't been started composition yet, this isn't necessary
  // for XP code since there is no TextComposition instance which is caused by
  // the PuppetWidget instance.
  NativeIMEContext mNativeIMEContext;
  ContentCacheInChild mContentCache;

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

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

  nsCOMPtr<imgIContainer> mCustomCursor;
  uint32_t mCursorHotspotX, mCursorHotspotY;

  nsCOMArray<nsIKeyEventInPluginCallback> mKeyEventInPluginCallbacks;

protected:
  bool mEnabled;
  bool mVisible;

private:
  bool mNeedIMEStateInit;
  bool mNativeKeyCommandsValid;
};

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

class PuppetScreenManager 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__