gecko/widget/PuppetWidget.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=8 et :
*/
2012-05-21 04:12:37 -07:00
/* 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) MOZ_OVERRIDE;
void InitIMEState();
virtual already_AddRefed<nsIWidget>
CreateChild(const nsIntRect &aRect,
nsDeviceContext *aContext,
nsWidgetInitData *aInitData = nullptr,
bool aForceUseIWidgetParent = false) MOZ_OVERRIDE;
NS_IMETHOD Destroy() MOZ_OVERRIDE;
NS_IMETHOD Show(bool aState) MOZ_OVERRIDE;
virtual bool IsVisible() const MOZ_OVERRIDE
{ return mVisible; }
NS_IMETHOD ConstrainPosition(bool /*ignored aAllowSlop*/,
int32_t* aX,
int32_t* aY) MOZ_OVERRIDE
{ *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) MOZ_OVERRIDE
{ return NS_OK; }
NS_IMETHOD Resize(double aWidth,
double aHeight,
bool aRepaint) MOZ_OVERRIDE;
NS_IMETHOD Resize(double aX,
double aY,
double aWidth,
double aHeight,
bool aRepaint) MOZ_OVERRIDE
// (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) MOZ_OVERRIDE
{ mEnabled = aState; return NS_OK; }
virtual bool IsEnabled() const MOZ_OVERRIDE
{ return mEnabled; }
NS_IMETHOD SetFocus(bool aRaise = false) MOZ_OVERRIDE;
virtual nsresult ConfigureChildren(const nsTArray<Configuration>& aConfigurations) MOZ_OVERRIDE;
NS_IMETHOD Invalidate(const nsIntRect& aRect) MOZ_OVERRIDE;
// 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) MOZ_OVERRIDE;
NS_IMETHOD ReparentNativeWidget(nsIWidget* aNewParent) MOZ_OVERRIDE
{ return NS_ERROR_UNEXPECTED; }
// PuppetWidgets don't have any concept of titles.
NS_IMETHOD SetTitle(const nsAString& aTitle) MOZ_OVERRIDE
{ return NS_ERROR_UNEXPECTED; }
// PuppetWidgets are always at <0, 0>.
virtual nsIntPoint WidgetToScreenOffset() MOZ_OVERRIDE
{ return nsIntPoint(0, 0); }
void InitEvent(WidgetGUIEvent& aEvent, nsIntPoint* aPoint = nullptr);
NS_IMETHOD DispatchEvent(WidgetGUIEvent* aEvent, nsEventStatus& aStatus) MOZ_OVERRIDE;
NS_IMETHOD CaptureRollupEvents(nsIRollupListener* aListener,
bool aDoCapture) MOZ_OVERRIDE
{ 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) MOZ_OVERRIDE;
NS_IMETHOD NotifyIME(const IMENotification& aIMENotification) MOZ_OVERRIDE;
NS_IMETHOD_(void) SetInputContext(const InputContext& aContext,
const InputContextAction& aAction) MOZ_OVERRIDE;
NS_IMETHOD_(InputContext) GetInputContext() MOZ_OVERRIDE;
virtual nsIMEUpdatePreference GetIMEUpdatePreference() MOZ_OVERRIDE;
NS_IMETHOD SetCursor(nsCursor aCursor) MOZ_OVERRIDE;
NS_IMETHOD SetCursor(imgIContainer* aCursor,
uint32_t aHotspotX, uint32_t aHotspotY) MOZ_OVERRIDE
{
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() MOZ_OVERRIDE;
virtual double GetDefaultScaleInternal() MOZ_OVERRIDE;
virtual bool NeedsPaint() MOZ_OVERRIDE;
virtual TabChild* GetOwningTabChild() MOZ_OVERRIDE { return mTabChild; }
virtual void ClearBackingScaleCache()
{
mDPI = -1;
mDefaultScale = -1;
}
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();
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);
nsresult NotifyIMEOfEditorRect();
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__