gecko/dom/base/nsPIDOMWindow.h

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#ifndef nsPIDOMWindow_h__
#define nsPIDOMWindow_h__

#include "nsISupports.h"
#include "nsIDOMLocation.h"
#include "nsIDOMXULCommandDispatcher.h"
#include "nsIDOMElement.h"
#include "nsIDOMWindowInternal.h"
#include "nsPIDOMEventTarget.h"
#include "nsIDOMDocument.h"
#include "nsCOMPtr.h"
#include "nsEvent.h"

#define DOM_WINDOW_DESTROYED_TOPIC "dom-window-destroyed"

class nsIPrincipal;
class nsICSSDeclaration;
class nsComputedDOMStyle;

// Popup control state enum. The values in this enum must go from most
// permissive to least permissive so that it's safe to push state in
// all situations. Pushing popup state onto the stack never makes the
// current popup state less permissive (see
// nsGlobalWindow::PushPopupControlState()).
enum PopupControlState {
  openAllowed = 0,  // open that window without worries
  openControlled,   // it's a popup, but allow it
  openAbused,       // it's a popup. disallow it, but allow domain override.
  openOverridden    // disallow window open
};

class nsIDocShell;
class nsIFocusController;
class nsIContent;
class nsIDocument;
class nsIScriptTimeoutHandler;
class nsPresContext;
struct nsTimeout;
class nsScriptObjectHolder;
class nsXBLPrototypeHandler;
class nsIArray;

#define NS_PIDOMWINDOW_IID \
{ 0x70c9f57f, 0xf7b3, 0x4a37, \
  { 0xbe, 0x36, 0xbb, 0xb2, 0xd7, 0xe9, 0x40, 0x13 } }

class nsPIDOMWindow : public nsIDOMWindowInternal
{
public:
  NS_DECLARE_STATIC_IID_ACCESSOR(NS_PIDOMWINDOW_IID)

  virtual nsPIDOMWindow* GetPrivateRoot() = 0;

  virtual void ActivateOrDeactivate(PRBool aActivate) = 0;

  nsPIDOMEventTarget* GetChromeEventHandler() const
  {
    return mChromeEventHandler;
  }

  virtual void SetChromeEventHandler(nsPIDOMEventTarget* aChromeEventHandler) = 0;

  PRBool HasMutationListeners(PRUint32 aMutationEventType) const
  {
    const nsPIDOMWindow *win;

    if (IsOuterWindow()) {
      win = GetCurrentInnerWindow();

      if (!win) {
        NS_ERROR("No current inner window available!");

        return PR_FALSE;
      }
    } else {
      if (!mOuterWindow) {
        NS_ERROR("HasMutationListeners() called on orphan inner window!");

        return PR_FALSE;
      }

      win = this;
    }

    return (win->mMutationBits & aMutationEventType) != 0;
  }

  void SetMutationListeners(PRUint32 aType)
  {
    nsPIDOMWindow *win;

    if (IsOuterWindow()) {
      win = GetCurrentInnerWindow();

      if (!win) {
        NS_ERROR("No inner window available to set mutation bits on!");

        return;
      }
    } else {
      if (!mOuterWindow) {
        NS_ERROR("HasMutationListeners() called on orphan inner window!");

        return;
      }

      win = this;
    }

    win->mMutationBits |= aType;
  }

  virtual nsIFocusController* GetRootFocusController() = 0;

  // GetExtantDocument provides a backdoor to the DOM GetDocument accessor
  nsIDOMDocument* GetExtantDocument() const
  {
    return mDocument;
  }

  // Internal getter/setter for the frame element, this version of the
  // getter crosses chrome boundaries whereas the public scriptable
  // one doesn't for security reasons.
  nsIDOMElement* GetFrameElementInternal() const
  {
    if (mOuterWindow) {
      return mOuterWindow->GetFrameElementInternal();
    }

    NS_ASSERTION(!IsInnerWindow(),
                 "GetFrameElementInternal() called on orphan inner window");

    return mFrameElement;
  }

  void SetFrameElementInternal(nsIDOMElement *aFrameElement)
  {
    if (IsOuterWindow()) {
      mFrameElement = aFrameElement;

      return;
    }

    if (!mOuterWindow) {
      NS_ERROR("frameElement set on inner window with no outer!");

      return;
    }

    mOuterWindow->SetFrameElementInternal(aFrameElement);
  }

  PRBool IsLoadingOrRunningTimeout() const
  {
    const nsPIDOMWindow *win = GetCurrentInnerWindow();

    if (!win) {
      win = this;
    }

    return !win->mIsDocumentLoaded || win->mRunningTimeout;
  }

  // Check whether a document is currently loading
  PRBool IsLoading() const
  {
    const nsPIDOMWindow *win;

    if (IsOuterWindow()) {
      win = GetCurrentInnerWindow();

      if (!win) {
        NS_ERROR("No current inner window available!");

        return PR_FALSE;
      }
    } else {
      if (!mOuterWindow) {
        NS_ERROR("IsLoading() called on orphan inner window!");

        return PR_FALSE;
      }

      win = this;
    }

    return !win->mIsDocumentLoaded;
  }

  PRBool IsHandlingResizeEvent() const
  {
    const nsPIDOMWindow *win;

    if (IsOuterWindow()) {
      win = GetCurrentInnerWindow();

      if (!win) {
        NS_ERROR("No current inner window available!");

        return PR_FALSE;
      }
    } else {
      if (!mOuterWindow) {
        NS_ERROR("IsHandlingResizeEvent() called on orphan inner window!");

        return PR_FALSE;
      }

      win = this;
    }

    return win->mIsHandlingResizeEvent;
  }

  // Convenience method for getting an element's computed style
  virtual already_AddRefed<nsComputedDOMStyle>
    LookupComputedStyleFor(nsIContent* aElem) = 0;

  // Tell this window who opened it.  This only has an effect if there is
  // either no document currently in the window or if the document is the
  // original document this window came with (an about:blank document either
  // preloaded into it when it was created, or created by
  // CreateAboutBlankContentViewer()).
  virtual void SetOpenerScriptPrincipal(nsIPrincipal* aPrincipal) = 0;
  // Ask this window who opened it.
  virtual nsIPrincipal* GetOpenerScriptPrincipal() = 0;

  virtual PopupControlState PushPopupControlState(PopupControlState aState,
                                                  PRBool aForce) const = 0;
  virtual void PopPopupControlState(PopupControlState state) const = 0;
  virtual PopupControlState GetPopupControlState() const = 0;

  // Returns an object containing the window's state.  This also suspends
  // all running timeouts in the window.
  virtual nsresult SaveWindowState(nsISupports **aState) = 0;

  // Restore the window state from aState.
  virtual nsresult RestoreWindowState(nsISupports *aState) = 0;

  // Suspend timeouts in this window and in child windows.
  virtual void SuspendTimeouts(PRUint32 aIncrease = 1,
                               PRBool aFreezeChildren = PR_TRUE) = 0;

  // Resume suspended timeouts in this window and in child windows.
  virtual nsresult ResumeTimeouts(PRBool aThawChildren = PR_TRUE) = 0;

  virtual PRUint32 TimeoutSuspendCount() = 0;

  // Fire any DOM notification events related to things that happened while
  // the window was frozen.
  virtual nsresult FireDelayedDOMEvents() = 0;

  virtual PRBool IsFrozen() const = 0;

  // Add a timeout to this window.
  virtual nsresult SetTimeoutOrInterval(nsIScriptTimeoutHandler *aHandler,
                                        PRInt32 interval,
                                        PRBool aIsInterval, PRInt32 *aReturn) = 0;

  // Clear a timeout from this window.
  virtual nsresult ClearTimeoutOrInterval(PRInt32 aTimerID) = 0;

  nsPIDOMWindow *GetOuterWindow()
  {
    return mIsInnerWindow ? mOuterWindow : this;
  }

  nsPIDOMWindow *GetCurrentInnerWindow() const
  {
    return mInnerWindow;
  }

  nsPIDOMWindow *EnsureInnerWindow()
  {
    NS_ASSERTION(IsOuterWindow(), "EnsureInnerWindow called on inner window");
    // GetDocument forces inner window creation if there isn't one already
    nsCOMPtr<nsIDOMDocument> doc;
    GetDocument(getter_AddRefs(doc));
    return GetCurrentInnerWindow();
  }

  PRBool IsInnerWindow() const
  {
    return mIsInnerWindow;
  }

  PRBool IsOuterWindow() const
  {
    return !IsInnerWindow();
  }

  virtual PRBool WouldReuseInnerWindow(nsIDocument *aNewDocument) = 0;

  /**
   * Get the docshell in this window.
   */
  nsIDocShell *GetDocShell()
  {
    if (mOuterWindow) {
      return mOuterWindow->mDocShell;
    }

    return mDocShell;
  }

  /**
   * Set or unset the docshell in the window.
   */
  virtual void SetDocShell(nsIDocShell *aDocShell) = 0;

  /**
   * Set a new document in the window. Calling this method will in
   * most cases create a new inner window. If this method is called on
   * an inner window the call will be forewarded to the outer window,
   * if the inner window is not the current inner window an
   * NS_ERROR_NOT_AVAILABLE error code will be returned. This may be
   * called with a pointer to the current document, in that case the
   * document remains unchanged, but a new inner window will be
   * created.
   */
  virtual nsresult SetNewDocument(nsIDocument *aDocument,
                                  nsISupports *aState,
                                  PRBool aClearScope) = 0;

  /**
   * Set the opener window.  aOriginalOpener is true if and only if this is the
   * original opener for the window.  That is, it can only be true at most once
   * during the life cycle of a window, and then only the first time
   * SetOpenerWindow is called.  It might never be true, of course, if the
   * window does not have an opener when it's created.
   */
  virtual void SetOpenerWindow(nsIDOMWindowInternal *aOpener,
                               PRBool aOriginalOpener) = 0;

  virtual void EnsureSizeUpToDate() = 0;

  /**
   * Callback for notifying a window about a modal dialog being
   * opened/closed with the window as a parent.
   */
  virtual void EnterModalState() = 0;
  virtual void LeaveModalState() = 0;

  void SetModalContentWindow(PRBool aIsModalContentWindow)
  {
    mIsModalContentWindow = aIsModalContentWindow;
  }

  PRBool IsModalContentWindow() const
  {
    return mIsModalContentWindow;
  }

  /**
   * Call this to indicate that some node (this window, its document,
   * or content in that document) has a paint event listener.
   */
  void SetHasPaintEventListeners()
  {
    mMayHavePaintEventListener = PR_TRUE;
  }

  /**
   * Call this to check whether some node (this window, its document,
   * or content in that document) has a paint event listener.
   */
  PRBool HasPaintEventListeners()
  {
    return mMayHavePaintEventListener;
  }
  
  /**
   * Initialize window.java and window.Packages.
   */
  virtual void InitJavaProperties() = 0;

  virtual void* GetCachedXBLPrototypeHandler(nsXBLPrototypeHandler* aKey) = 0;
  virtual void CacheXBLPrototypeHandler(nsXBLPrototypeHandler* aKey,
                                        nsScriptObjectHolder& aHandler) = 0;

  /*
   * Get and set the currently focused element within the document. If
   * aNeedsFocus is true, then set mNeedsFocus to true to indicate that a
   * document focus event is needed.
   *
   * DO NOT CALL EITHER OF THESE METHODS DIRECTLY. USE THE FOCUS MANAGER
   * INSTEAD.
   */
  virtual nsIContent* GetFocusedNode() = 0;
  virtual void SetFocusedNode(nsIContent* aNode,
                              PRUint32 aFocusMethod = 0,
                              PRBool aNeedsFocus = PR_FALSE) = 0;

  /**
   * Retrieves the method that was used to focus the current node.
   */
  virtual PRUint32 GetFocusMethod() = 0;

  /*
   * Tells the window that it now has focus or has lost focus, based on the
   * state of aFocus. If this method returns true, then the document loaded
   * in the window has never received a focus event and expects to receive
   * one. If false is returned, the document has received a focus event before
   * and should only receive one if the window is being focused.
   *
   * aFocusMethod may be set to one of the focus method constants in
   * nsIFocusManager to indicate how focus was set.
   */
  virtual PRBool TakeFocus(PRBool aFocus, PRUint32 aFocusMethod) = 0;

  /**
   * Indicates that the window may now accept a document focus event. This
   * should be called once a document has been loaded into the window.
   */
  virtual void SetReadyForFocus() = 0;

  /**
   * Indicates that the page in the window has been hidden. This is used to
   * reset the focus state.
   */
  virtual void PageHidden() = 0;

  /**
   * Instructs this window to asynchronously dispatch a hashchange event.  This
   * method must be called on an inner window.
   */
  virtual nsresult DispatchAsyncHashchange() = 0;


  /**
   * Tell this window that there is an observer for orientation changes
   */
  virtual void SetHasOrientationEventListener() = 0;

  /**
   * Set a arguments for this window. This will be set on the window
   * right away (if there's an existing document) and it will also be
   * installed on the window when the next document is loaded. Each
   * language impl is responsible for converting to an array of args
   * as appropriate for that language.
   */
  virtual nsresult SetArguments(nsIArray *aArguments, nsIPrincipal *aOrigin) = 0;

protected:
  // The nsPIDOMWindow constructor. The aOuterWindow argument should
  // be null if and only if the created window itself is an outer
  // window. In all other cases aOuterWindow should be the outer
  // window for the inner window that is being created.
  nsPIDOMWindow(nsPIDOMWindow *aOuterWindow)
    : mFrameElement(nsnull), mDocShell(nsnull), mModalStateDepth(0),
      mRunningTimeout(nsnull), mMutationBits(0), mIsDocumentLoaded(PR_FALSE),
      mIsHandlingResizeEvent(PR_FALSE), mIsInnerWindow(aOuterWindow != nsnull),
      mMayHavePaintEventListener(PR_FALSE),
      mIsModalContentWindow(PR_FALSE), mInnerWindow(nsnull),
      mOuterWindow(aOuterWindow)
  {
  }

  void SetChromeEventHandlerInternal(nsPIDOMEventTarget* aChromeEventHandler) {
    mChromeEventHandler = aChromeEventHandler;
  }

  // These two variables are special in that they're set to the same
  // value on both the outer window and the current inner window. Make
  // sure you keep them in sync!
  nsCOMPtr<nsPIDOMEventTarget> mChromeEventHandler; // strong
  nsCOMPtr<nsIDOMDocument> mDocument; // strong

  // These members are only used on outer windows.
  nsCOMPtr<nsIDOMElement> mFrameElement;
  nsIDocShell           *mDocShell;  // Weak Reference

  PRUint32               mModalStateDepth;

  // These variables are only used on inner windows.
  nsTimeout             *mRunningTimeout;

  PRUint32               mMutationBits;

  PRPackedBool           mIsDocumentLoaded;
  PRPackedBool           mIsHandlingResizeEvent;
  PRPackedBool           mIsInnerWindow;
  PRPackedBool           mMayHavePaintEventListener;

  // This variable is used on both inner and outer windows (and they
  // should match).
  PRPackedBool           mIsModalContentWindow;

  // And these are the references between inner and outer windows.
  nsPIDOMWindow         *mInnerWindow;
  nsPIDOMWindow         *mOuterWindow;
};


NS_DEFINE_STATIC_IID_ACCESSOR(nsPIDOMWindow, NS_PIDOMWINDOW_IID)

#ifdef _IMPL_NS_LAYOUT
PopupControlState
PushPopupControlState(PopupControlState aState, PRBool aForce);

void
PopPopupControlState(PopupControlState aState);

#define NS_AUTO_POPUP_STATE_PUSHER nsAutoPopupStatePusherInternal
#else
#define NS_AUTO_POPUP_STATE_PUSHER nsAutoPopupStatePusherExternal
#endif

// Helper class that helps with pushing and popping popup control
// state. Note that this class looks different from within code that's
// part of the layout library than it does in code outside the layout
// library.  We give the two object layouts different names so the symbols
// don't conflict, but code should always use the name
// |nsAutoPopupStatePusher|.
class NS_AUTO_POPUP_STATE_PUSHER
{
public:
#ifdef _IMPL_NS_LAYOUT
  NS_AUTO_POPUP_STATE_PUSHER(PopupControlState aState, PRBool aForce = PR_FALSE)
    : mOldState(::PushPopupControlState(aState, aForce))
  {
  }

  ~NS_AUTO_POPUP_STATE_PUSHER()
  {
    PopPopupControlState(mOldState);
  }
#else
  NS_AUTO_POPUP_STATE_PUSHER(nsPIDOMWindow *aWindow, PopupControlState aState)
    : mWindow(aWindow), mOldState(openAbused)
  {
    if (aWindow) {
      mOldState = aWindow->PushPopupControlState(aState, PR_FALSE);
    }
  }

  ~NS_AUTO_POPUP_STATE_PUSHER()
  {
    if (mWindow) {
      mWindow->PopPopupControlState(mOldState);
    }
  }
#endif

protected:
#ifndef _IMPL_NS_LAYOUT
  nsCOMPtr<nsPIDOMWindow> mWindow;
#endif
  PopupControlState mOldState;

private:
  // Hide so that this class can only be stack-allocated
  static void* operator new(size_t /*size*/) CPP_THROW_NEW { return nsnull; }
  static void operator delete(void* /*memory*/) {}
};

#define nsAutoPopupStatePusher NS_AUTO_POPUP_STATE_PUSHER

#endif // nsPIDOMWindow_h__