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pjs/layout/base/nsIPresShell.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Steve Clark <buster@netscape.com>
* Dan Rosen <dr@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK *****
*
* This Original Code has been modified by IBM Corporation.
* Modifications made by IBM described herein are
* Copyright (c) International Business Machines
* Corporation, 2000
*
* Modifications to Mozilla code or documentation
* identified per MPL Section 3.3
*
* Date Modified by Description of modification
* 05/03/2000 IBM Corp. Observer related defines for reflow
*/
/* a presentation of a document, part 2 */
#ifndef nsIPresShell_h___
#define nsIPresShell_h___
#include "nsISupports.h"
#include "nsQueryFrame.h"
#include "nsCoord.h"
#include "nsRect.h"
#include "nsColor.h"
#include "nsEvent.h"
#include "nsCompatibility.h"
#include "nsFrameManagerBase.h"
#include "mozFlushType.h"
#include "nsWeakReference.h"
#include <stdio.h> // for FILE definition
class nsIAtom;
class nsIContent;
class nsIContentIterator;
class nsIDocument;
class nsIDocumentObserver;
class nsIFrame;
class nsPresContext;
class nsStyleSet;
class nsIViewManager;
class nsIDeviceContext;
class nsIRenderingContext;
class nsIPageSequenceFrame;
class nsString;
class nsAString;
class nsCaret;
class nsStyleContext;
class nsFrameSelection;
class nsFrameManager;
class nsILayoutHistoryState;
class nsIReflowCallback;
class nsIDOMNode;
class nsIRegion;
class nsIStyleFrameConstruction;
class nsIStyleSheet;
class nsCSSFrameConstructor;
class nsISelection;
template<class E> class nsCOMArray;
class nsWeakFrame;
class nsIScrollableFrame;
class gfxASurface;
class gfxContext;
class nsPIDOMEventTarget;
class nsIDOMEvent;
class nsDisplayList;
class nsDisplayListBuilder;
typedef short SelectionType;
typedef PRUint32 nsFrameState;
// Flags to pass to SetCapturingContent
//
// when assigning capture, ignore whether capture is allowed or not
#define CAPTURE_IGNOREALLOWED 1
// true if events should be targeted at the capturing content or its children
#define CAPTURE_RETARGETTOELEMENT 2
// true if the current capture wants drags to be prevented
#define CAPTURE_PREVENTDRAG 4
typedef struct CapturingContentInfo {
// capture should only be allowed during a mousedown event
PRPackedBool mAllowed;
PRPackedBool mRetargetToElement;
PRPackedBool mPreventDrag;
nsIContent* mContent;
CapturingContentInfo() :
mAllowed(PR_FALSE), mRetargetToElement(PR_FALSE), mPreventDrag(PR_FALSE),
mContent(nsnull) { }
} CapturingContentInfo;
#define NS_IPRESSHELL_IID \
{ 0xe5e070ce, 0xbc17, 0x4b5f, \
{ 0xb2, 0x21, 0xbf, 0xc3, 0xe1, 0x68, 0xbe, 0x9b } }
// Constants for ScrollContentIntoView() function
#define NS_PRESSHELL_SCROLL_TOP 0
#define NS_PRESSHELL_SCROLL_BOTTOM 100
#define NS_PRESSHELL_SCROLL_LEFT 0
#define NS_PRESSHELL_SCROLL_RIGHT 100
#define NS_PRESSHELL_SCROLL_CENTER 50
#define NS_PRESSHELL_SCROLL_ANYWHERE -1
#define NS_PRESSHELL_SCROLL_IF_NOT_VISIBLE -2
// debug VerifyReflow flags
#define VERIFY_REFLOW_ON 0x01
#define VERIFY_REFLOW_NOISY 0x02
#define VERIFY_REFLOW_ALL 0x04
#define VERIFY_REFLOW_DUMP_COMMANDS 0x08
#define VERIFY_REFLOW_NOISY_RC 0x10
#define VERIFY_REFLOW_REALLY_NOISY_RC 0x20
#define VERIFY_REFLOW_DURING_RESIZE_REFLOW 0x40
#undef NOISY_INTERRUPTIBLE_REFLOW
enum nsRectVisibility {
nsRectVisibility_kVisible,
nsRectVisibility_kAboveViewport,
nsRectVisibility_kBelowViewport,
nsRectVisibility_kLeftOfViewport,
nsRectVisibility_kRightOfViewport
};
/**
* Presentation shell interface. Presentation shells are the
* controlling point for managing the presentation of a document. The
* presentation shell holds a live reference to the document, the
* presentation context, the style manager, the style set and the root
* frame. <p>
*
* When this object is Release'd, it will release the document, the
* presentation context, the style manager, the style set and the root
* frame.
*/
// hack to make egcs / gcc 2.95.2 happy
class nsIPresShell_base : public nsISupports
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_IPRESSHELL_IID)
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIPresShell_base, NS_IPRESSHELL_IID)
class nsIPresShell : public nsIPresShell_base
{
public:
NS_IMETHOD Init(nsIDocument* aDocument,
nsPresContext* aPresContext,
nsIViewManager* aViewManager,
nsStyleSet* aStyleSet,
nsCompatibility aCompatMode) = 0;
/**
* All callers are responsible for calling |Destroy| after calling
* |EndObservingDocument|. It needs to be separate only because form
* controls incorrectly store their data in the frames rather than the
* content model and printing calls |EndObservingDocument| multiple
* times to make form controls behave nicely when printed.
*/
NS_IMETHOD Destroy() = 0;
PRBool IsDestroying() { return mIsDestroying; }
// All frames owned by the shell are allocated from an arena. They
// are also recycled using free lists. Separate free lists are
// maintained for each frame type (aCode), which must always
// correspond to the same aSize value. AllocateFrame clears the
// memory that it returns.
virtual void* AllocateFrame(nsQueryFrame::FrameIID aCode, size_t aSize) = 0;
virtual void FreeFrame(nsQueryFrame::FrameIID aCode, void* aChunk) = 0;
// Objects closely related to the frame tree, but that are not
// actual frames (subclasses of nsFrame) are also allocated from the
// arena, and recycled via a separate set of per-size free lists.
// AllocateMisc does *not* clear the memory that it returns.
virtual void* AllocateMisc(size_t aSize) = 0;
virtual void FreeMisc(size_t aSize, void* aChunk) = 0;
/**
* Stack memory allocation:
*
* Callers who wish to allocate memory whose lifetime corresponds to
* the lifetime of a stack-allocated object can use this API. The
* caller must use a pair of calls to PushStackMemory and
* PopStackMemory, such that all stack object lifetimes are either
* entirely between the calls or containing both calls.
*
* Then, between the calls, the caller can call AllocateStackMemory to
* allocate memory from an arena pool that will be freed by the call
* to PopStackMemory.
*
* The allocations cannot be for more than 4044 bytes.
*/
virtual void PushStackMemory() = 0;
virtual void PopStackMemory() = 0;
virtual void* AllocateStackMemory(size_t aSize) = 0;
nsIDocument* GetDocument() const { return mDocument; }
nsPresContext* GetPresContext() { return mPresContext; }
nsIViewManager* GetViewManager() { return mViewManager; }
#ifdef _IMPL_NS_LAYOUT
nsStyleSet* StyleSet() { return mStyleSet; }
nsCSSFrameConstructor* FrameConstructor()
{
return mFrameConstructor;
}
nsFrameManager* FrameManager() const {
return reinterpret_cast<nsFrameManager*>
(&const_cast<nsIPresShell*>(this)->mFrameManager);
}
#endif
/* Enable/disable author style level. Disabling author style disables the entire
* author level of the cascade, including the HTML preshint level.
*/
// XXX these could easily be inlined, but there is a circular #include
// problem with nsStyleSet.
NS_HIDDEN_(void) SetAuthorStyleDisabled(PRBool aDisabled);
NS_HIDDEN_(PRBool) GetAuthorStyleDisabled();
/*
* Called when stylesheets are added/removed/enabled/disabled to rebuild
* all style data for a given pres shell without necessarily reconstructing
* all of the frames. This will not reconstruct style synchronously; if
* you need to do that, call FlushPendingNotifications to flush out style
* reresolves.
* // XXXbz why do we have this on the interface anyway? The only consumer
* is calling AddOverrideStyleSheet/RemoveOverrideStyleSheet, and I think
* those should just handle reconstructing style data...
*/
virtual NS_HIDDEN_(void) ReconstructStyleDataExternal();
NS_HIDDEN_(void) ReconstructStyleDataInternal();
#ifdef _IMPL_NS_LAYOUT
void ReconstructStyleData() { ReconstructStyleDataInternal(); }
#else
void ReconstructStyleData() { ReconstructStyleDataExternal(); }
#endif
/** Setup all style rules required to implement preferences
* - used for background/text/link colors and link underlining
* may be extended for any prefs that are implemented via style rules
* - aForceReflow argument is used to force a full reframe to make the rules show
* (only used when the current page needs to reflect changed pref rules)
*
* - initially created for bugs 31816, 20760, 22963
*/
NS_IMETHOD SetPreferenceStyleRules(PRBool aForceReflow) = 0;
/**
* FrameSelection will return the Frame based selection API.
* You cannot go back and forth anymore with QI between nsIDOM sel and
* nsIFrame sel.
*/
already_AddRefed<nsFrameSelection> FrameSelection();
/**
* ConstFrameSelection returns an object which methods are safe to use for
* example in nsIFrame code.
*/
const nsFrameSelection* ConstFrameSelection() { return mSelection; }
// Make shell be a document observer. If called after Destroy() has
// been called on the shell, this will be ignored.
NS_IMETHOD BeginObservingDocument() = 0;
// Make shell stop being a document observer
NS_IMETHOD EndObservingDocument() = 0;
/**
* Return whether InitialReflow() was previously called.
*/
PRBool DidInitialReflow() const { return mDidInitialReflow; }
/**
* Perform the initial reflow. Constructs the frame for the root content
* object and then reflows the frame model into the specified width and
* height.
*
* The coordinates for aWidth and aHeight must be in standard nscoords.
*
* Callers of this method must hold a reference to this shell that
* is guaranteed to survive through arbitrary script execution.
* Calling InitialReflow can execute arbitrary script.
*/
NS_IMETHOD InitialReflow(nscoord aWidth, nscoord aHeight) = 0;
/**
* Reflow the frame model into a new width and height. The
* coordinates for aWidth and aHeight must be in standard nscoord's.
*/
NS_IMETHOD ResizeReflow(nscoord aWidth, nscoord aHeight) = 0;
/**
* Reflow the frame model with a reflow reason of eReflowReason_StyleChange
*/
NS_IMETHOD StyleChangeReflow() = 0;
/**
* This calls through to the frame manager to get the root frame.
* Callers inside of gklayout should use FrameManager()->GetRootFrame()
* instead, as it's more efficient.
*/
virtual NS_HIDDEN_(nsIFrame*) GetRootFrame() const;
/*
* Get root scroll frame from FrameManager()->GetRootFrame().
*/
nsIFrame* GetRootScrollFrame() const;
/*
* The same as GetRootScrollFrame, but returns an nsIScrollableFrame
*/
nsIScrollableFrame* GetRootScrollFrameAsScrollable() const;
/*
* The same as GetRootScrollFrame, but returns an nsIScrollableFrame.
* Can be called by code not linked into gklayout.
*/
virtual nsIScrollableFrame* GetRootScrollFrameAsScrollableExternal() const;
/*
* Gets nearest scrollable frame from current focused content or DOM
* selection if there is no focused content. The frame is scrollable with
* overflow:scroll or overflow:auto in some direction when aDirection is
* eEither. Otherwise, this returns a nearest frame that is scrollable in
* the specified direction.
*/
enum ScrollDirection { eHorizontal, eVertical, eEither };
nsIScrollableFrame* GetFrameToScrollAsScrollable(ScrollDirection aDirection);
/**
* Returns the page sequence frame associated with the frame hierarchy.
* Returns NULL if not a paginated view.
*/
NS_IMETHOD GetPageSequenceFrame(nsIPageSequenceFrame** aResult) const = 0;
/**
* Gets the real primary frame associated with the content object.
*
* In the case of absolutely positioned elements and floated elements,
* the real primary frame is the frame that is out of the flow and not the
* placeholder frame.
*/
virtual NS_HIDDEN_(nsIFrame*) GetRealPrimaryFrameFor(nsIContent* aContent) const = 0;
/**
* Gets the placeholder frame associated with the specified frame. This is
* a helper frame that forwards the request to the frame manager.
*/
NS_IMETHOD GetPlaceholderFrameFor(nsIFrame* aFrame,
nsIFrame** aPlaceholderFrame) const = 0;
/**
* Tell the pres shell that a frame needs to be marked dirty and needs
* Reflow. It's OK if this is an ancestor of the frame needing reflow as
* long as the ancestor chain between them doesn't cross a reflow root. The
* bit to add should be either NS_FRAME_IS_DIRTY or
* NS_FRAME_HAS_DIRTY_CHILDREN (but not both!).
*/
enum IntrinsicDirty {
// XXXldb eResize should be renamed
eResize, // don't mark any intrinsic widths dirty
eTreeChange, // mark intrinsic widths dirty on aFrame and its ancestors
eStyleChange // Do eTreeChange, plus all of aFrame's descendants
};
NS_IMETHOD FrameNeedsReflow(nsIFrame *aFrame,
IntrinsicDirty aIntrinsicDirty,
nsFrameState aBitToAdd) = 0;
/**
* Tell the presshell that the given frame's reflow was interrupted. This
* will mark as having dirty children a path from the given frame (inclusive)
* to the nearest ancestor with a dirty subtree, or to the reflow root
* currently being reflowed if no such ancestor exists (inclusive). This is
* to be done immediately after reflow of the current reflow root completes.
* This method must only be called during reflow, and the frame it's being
* called on must be in the process of being reflowed when it's called. This
* method doesn't mark any intrinsic widths dirty and doesn't add any bits
* other than NS_FRAME_HAS_DIRTY_CHILDREN.
*/
NS_IMETHOD_(void) FrameNeedsToContinueReflow(nsIFrame *aFrame) = 0;
NS_IMETHOD CancelAllPendingReflows() = 0;
/**
* Recreates the frames for a node
*/
NS_IMETHOD RecreateFramesFor(nsIContent* aContent) = 0;
void PostRecreateFramesFor(nsIContent* aContent);
void RestyleForAnimation(nsIContent* aContent);
/**
* Determine if it is safe to flush all pending notifications
* @param aIsSafeToFlush PR_TRUE if it is safe, PR_FALSE otherwise.
*
*/
NS_IMETHOD IsSafeToFlush(PRBool& aIsSafeToFlush) = 0;
/**
* Flush pending notifications of the type specified. This method
* will not affect the content model; it'll just affect style and
* frames. Callers that actually want up-to-date presentation (other
* than the document itself) should probably be calling
* nsIDocument::FlushPendingNotifications.
*
* @param aType the type of notifications to flush
*/
NS_IMETHOD FlushPendingNotifications(mozFlushType aType) = 0;
/**
* Callbacks will be called even if reflow itself fails for
* some reason.
*/
NS_IMETHOD PostReflowCallback(nsIReflowCallback* aCallback) = 0;
NS_IMETHOD CancelReflowCallback(nsIReflowCallback* aCallback) = 0;
NS_IMETHOD ClearFrameRefs(nsIFrame* aFrame) = 0;
/**
* Given a frame, create a rendering context suitable for use with
* the frame.
*/
NS_IMETHOD CreateRenderingContext(nsIFrame *aFrame,
nsIRenderingContext** aContext) = 0;
/**
* Informs the pres shell that the document is now at the anchor with
* the given name. If |aScroll| is true, scrolls the view of the
* document so that the anchor with the specified name is displayed at
* the top of the window. If |aAnchorName| is empty, then this informs
* the pres shell that there is no current target, and |aScroll| must
* be false.
*/
NS_IMETHOD GoToAnchor(const nsAString& aAnchorName, PRBool aScroll) = 0;
/**
* Tells the presshell to scroll again to the last anchor scrolled to by
* GoToAnchor, if any. This scroll only happens if the scroll
* position has not changed since the last GoToAnchor. This is called
* by nsDocumentViewer::LoadComplete. This clears the last anchor
* scrolled to by GoToAnchor (we don't want to keep it alive if it's
* removed from the DOM), so don't call this more than once.
*/
NS_IMETHOD ScrollToAnchor() = 0;
/**
* Scrolls the view of the document so that the primary frame of the content
* is displayed in the window. Layout is flushed before scrolling.
*
* @param aContent The content object of which primary frame should be
* scrolled into view.
* @param aVPercent How to align the frame vertically. A value of 0
* (NS_PRESSHELL_SCROLL_TOP) means the frame's upper edge is
* aligned with the top edge of the visible area. A value of
* 100 (NS_PRESSHELL_SCROLL_BOTTOM) means the frame's bottom
* edge is aligned with the bottom edge of the visible area.
* For values in between, the point "aVPercent" down the frame
* is placed at the point "aVPercent" down the visible area. A
* value of 50 (NS_PRESSHELL_SCROLL_CENTER) centers the frame
* vertically. A value of NS_PRESSHELL_SCROLL_ANYWHERE means move
* the frame the minimum amount necessary in order for the entire
* frame to be visible vertically (if possible)
* @param aHPercent How to align the frame horizontally. A value of 0
* (NS_PRESSHELL_SCROLL_LEFT) means the frame's left edge is
* aligned with the left edge of the visible area. A value of
* 100 (NS_PRESSHELL_SCROLL_RIGHT) means the frame's right
* edge is aligned with the right edge of the visible area.
* For values in between, the point "aVPercent" across the frame
* is placed at the point "aVPercent" across the visible area.
* A value of 50 (NS_PRESSHELL_SCROLL_CENTER) centers the frame
* horizontally . A value of NS_PRESSHELL_SCROLL_ANYWHERE means move
* the frame the minimum amount necessary in order for the entire
* frame to be visible horizontally (if possible)
*/
NS_IMETHOD ScrollContentIntoView(nsIContent* aContent,
PRIntn aVPercent,
PRIntn aHPercent) = 0;
enum {
SCROLL_FIRST_ANCESTOR_ONLY = 0x01,
SCROLL_OVERFLOW_HIDDEN = 0x02
};
/**
* Scrolls the view of the document so that the given area of a frame
* is visible, if possible. Layout is not flushed before scrolling.
*
* @param aRect relative to aFrame
* @param aVPercent see ScrollContentIntoView
* @param aHPercent see ScrollContentIntoView
* @param aFlags if SCROLL_FIRST_ANCESTOR_ONLY is set, only the
* nearest scrollable ancestor is scrolled, otherwise all
* scrollable ancestors may be scrolled if necessary
* if SCROLL_OVERFLOW_HIDDEN is set then we may scroll in a direction
* even if overflow:hidden is specified in that direction; otherwise
* we will not scroll in that direction when overflow:hidden is
* set for that direction
* @return true if any scrolling happened, false if no scrolling happened
*/
virtual PRBool ScrollFrameRectIntoView(nsIFrame* aFrame,
const nsRect& aRect,
PRIntn aVPercent,
PRIntn aHPercent,
PRUint32 aFlags) = 0;
/**
* Determine if a rectangle specified in the frame's coordinate system
* intersects the viewport "enough" to be considered visible.
* @param aFrame frame that aRect coordinates are specified relative to
* @param aRect rectangle in twips to test for visibility
* @param aMinTwips is the minimum distance in from the edge of the viewport
* that an object must be to be counted visible
* @return nsRectVisibility_kVisible if the rect is visible
* nsRectVisibility_kAboveViewport
* nsRectVisibility_kBelowViewport
* nsRectVisibility_kLeftOfViewport
* nsRectVisibility_kRightOfViewport rectangle is outside the viewport
* in the specified direction
*/
virtual nsRectVisibility GetRectVisibility(nsIFrame *aFrame,
const nsRect &aRect,
nscoord aMinTwips) = 0;
/**
* Suppress notification of the frame manager that frames are
* being destroyed.
*/
NS_IMETHOD SetIgnoreFrameDestruction(PRBool aIgnore) = 0;
/**
* Notification sent by a frame informing the pres shell that it is about to
* be destroyed.
* This allows any outstanding references to the frame to be cleaned up
*/
NS_IMETHOD NotifyDestroyingFrame(nsIFrame* aFrame) = 0;
/**
* Notify the Clipboard that we have something to copy.
*/
NS_IMETHOD DoCopy() = 0;
/**
* Get the selection of the focussed element (either the page selection,
* or the selection for a text field).
*/
NS_IMETHOD GetSelectionForCopy(nsISelection** outSelection) = 0;
/**
* Get link location.
*/
NS_IMETHOD GetLinkLocation(nsIDOMNode* aNode, nsAString& aLocation) = 0;
/**
* Get the doc or the selection as text or html.
*/
NS_IMETHOD DoGetContents(const nsACString& aMimeType, PRUint32 aFlags, PRBool aSelectionOnly, nsAString& outValue) = 0;
/**
* Get the caret, if it exists. AddRefs it.
*/
NS_IMETHOD GetCaret(nsCaret **aOutCaret) = 0;
/**
* Invalidate the caret's current position if it's outside of its frame's
* boundaries. This function is useful if you're batching selection
* notifications and might remove the caret's frame out from under it.
*/
NS_IMETHOD_(void) MaybeInvalidateCaretPosition() = 0;
/**
* Set the current caret to a new caret. To undo this, call RestoreCaret.
*/
virtual void SetCaret(nsCaret *aNewCaret) = 0;
/**
* Restore the caret to the original caret that this pres shell was created
* with.
*/
virtual void RestoreCaret() = 0;
/**
* Should the images have borders etc. Actual visual effects are determined
* by the frames. Visual effects may not effect layout, only display.
* Takes effect on next repaint, does not force a repaint itself.
*
* @param aEnabled if PR_TRUE, visual selection effects are enabled
* if PR_FALSE visual selection effects are disabled
* @return always NS_OK
*/
NS_IMETHOD SetSelectionFlags(PRInt16 aInEnable) = 0;
/**
* Gets the current state of non text selection effects
* @param aEnabled [OUT] set to the current state of non text selection,
* as set by SetDisplayNonTextSelection
* @return if aOutEnabled==null, returns NS_ERROR_INVALID_ARG
* else NS_OK
*/
NS_IMETHOD GetSelectionFlags(PRInt16 *aOutEnabled) = 0;
virtual nsISelection* GetCurrentSelection(SelectionType aType) = 0;
/**
* Interface to dispatch events via the presshell
* @note The caller must have a strong reference to the PresShell.
*/
NS_IMETHOD HandleEventWithTarget(nsEvent* aEvent,
nsIFrame* aFrame,
nsIContent* aContent,
nsEventStatus* aStatus) = 0;
/**
* Dispatch event to content only (NOT full processing)
* @note The caller must have a strong reference to the PresShell.
*/
NS_IMETHOD HandleDOMEventWithTarget(nsIContent* aTargetContent,
nsEvent* aEvent,
nsEventStatus* aStatus) = 0;
/**
* Dispatch event to content only (NOT full processing)
* @note The caller must have a strong reference to the PresShell.
*/
NS_IMETHOD HandleDOMEventWithTarget(nsIContent* aTargetContent,
nsIDOMEvent* aEvent,
nsEventStatus* aStatus) = 0;
/**
* Gets the current target event frame from the PresShell
*/
NS_IMETHOD GetEventTargetFrame(nsIFrame** aFrame) = 0;
/**
* Gets the current target event frame from the PresShell
*/
NS_IMETHOD GetEventTargetContent(nsEvent* aEvent, nsIContent** aContent) = 0;
/**
* Get and set the history state for the current document
*/
NS_IMETHOD CaptureHistoryState(nsILayoutHistoryState** aLayoutHistoryState, PRBool aLeavingPage = PR_FALSE) = 0;
/**
* Determine if reflow is currently locked
* @param aIsReflowLocked returns PR_TRUE if reflow is locked, PR_FALSE otherwise
*/
NS_IMETHOD IsReflowLocked(PRBool* aIsLocked) = 0;
/**
* Called to find out if painting is suppressed for this presshell. If it is suppressd,
* we don't allow the painting of any layer but the background, and we don't
* recur into our children.
*/
NS_IMETHOD IsPaintingSuppressed(PRBool* aResult)=0;
/**
* Unsuppress painting.
*/
NS_IMETHOD UnsuppressPainting() = 0;
/**
* Called to disable nsITheme support in a specific presshell.
*/
NS_IMETHOD DisableThemeSupport() = 0;
/**
* Indicates whether theme support is enabled.
*/
virtual PRBool IsThemeSupportEnabled() = 0;
/**
* Get the set of agent style sheets for this presentation
*/
virtual nsresult GetAgentStyleSheets(nsCOMArray<nsIStyleSheet>& aSheets) = 0;
/**
* Replace the set of agent style sheets
*/
virtual nsresult SetAgentStyleSheets(const nsCOMArray<nsIStyleSheet>& aSheets) = 0;
/**
* Add an override style sheet for this presentation
*/
virtual nsresult AddOverrideStyleSheet(nsIStyleSheet *aSheet) = 0;
/**
* Remove an override style sheet
*/
virtual nsresult RemoveOverrideStyleSheet(nsIStyleSheet *aSheet) = 0;
/**
* Reconstruct frames for all elements in the document
*/
virtual nsresult ReconstructFrames() = 0;
/**
* Given aFrame, the root frame of a stacking context, find its descendant
* frame under the point aPt that receives a mouse event at that location,
* or nsnull if there is no such frame.
* @param aPt the point, relative to the frame origin
*/
virtual nsIFrame* GetFrameForPoint(nsIFrame* aFrame, nsPoint aPt) = 0;
/**
* See if reflow verification is enabled. To enable reflow verification add
* "verifyreflow:1" to your NSPR_LOG_MODULES environment variable
* (any non-zero debug level will work). Or, call SetVerifyReflowEnable
* with PR_TRUE.
*/
static PRBool GetVerifyReflowEnable();
/**
* Set the verify-reflow enable flag.
*/
static void SetVerifyReflowEnable(PRBool aEnabled);
/**
* Get the flags associated with the VerifyReflow debug tool
*/
static PRInt32 GetVerifyReflowFlags();
virtual nsIFrame* GetAbsoluteContainingBlock(nsIFrame* aFrame);
#ifdef MOZ_REFLOW_PERF
NS_IMETHOD DumpReflows() = 0;
NS_IMETHOD CountReflows(const char * aName, nsIFrame * aFrame) = 0;
NS_IMETHOD PaintCount(const char * aName,
nsIRenderingContext* aRenderingContext,
nsPresContext * aPresContext,
nsIFrame * aFrame,
PRUint32 aColor) = 0;
NS_IMETHOD SetPaintFrameCount(PRBool aOn) = 0;
virtual PRBool IsPaintingFrameCounts() = 0;
#endif
#ifdef DEBUG
// Debugging hooks
virtual void ListStyleContexts(nsIFrame *aRootFrame, FILE *out,
PRInt32 aIndent = 0) = 0;
virtual void ListStyleSheets(FILE *out, PRInt32 aIndent = 0) = 0;
virtual void VerifyStyleTree() = 0;
#endif
static PRBool gIsAccessibilityActive;
static PRBool IsAccessibilityActive() { return gIsAccessibilityActive; }
/**
* Stop all active elements (plugins and the caret) in this presentation and
* in the presentations of subdocuments. Resets painting to a suppressed state.
* XXX this should include image animations
*/
virtual void Freeze() = 0;
/**
* Restarts active elements (plugins) in this presentation and in the
* presentations of subdocuments, then do a full invalidate of the content area.
*/
virtual void Thaw() = 0;
virtual void FireOrClearDelayedEvents(PRBool aFireEvents) = 0;
/**
* When this shell is disconnected from its containing docshell, we
* lose our container pointer. However, we'd still like to be able to target
* user events at the docshell's parent. This pointer allows us to do that.
* It should not be used for any other purpose.
*/
void SetForwardingContainer(nsWeakPtr aContainer)
{
mForwardingContainer = aContainer;
}
/**
* Render the document into an arbitrary gfxContext
* Designed for getting a picture of a document or a piece of a document
* Note that callers will generally want to call FlushPendingNotifications
* to get an up-to-date view of the document
* @param aRect is the region to capture into the offscreen buffer, in the
* root frame's coordinate system (if aIgnoreViewportScrolling is false)
* or in the root scrolled frame's coordinate system
* (if aIgnoreViewportScrolling is true). The coordinates are in appunits.
* @param aFlags see below;
* set RENDER_IS_UNTRUSTED if the contents may be passed to malicious
* agents. E.g. we might choose not to paint the contents of sensitive widgets
* such as the file name in a file upload widget, and we might choose not
* to paint themes.
* set RENDER_IGNORE_VIEWPORT_SCROLLING to ignore
* clipping/scrolling/scrollbar painting due to scrolling in the viewport
* set RENDER_CARET to draw the caret if one would be visible
* (by default the caret is never drawn)
* set RENDER_USE_LAYER_MANAGER to force rendering to go through
* the layer manager for the window. This may be unexpectedly slow
* (if the layer manager must read back data from the GPU) or low-quality
* (if the layer manager reads back pixel data and scales it
* instead of rendering using the appropriate scaling). It may also
* slow everything down if the area rendered does not correspond to the
* normal visible area of the window.
* @param aBackgroundColor a background color to render onto
* @param aRenderedContext the gfxContext to render to. We render so that
* one CSS pixel in the source document is rendered to one unit in the current
* transform.
*/
enum {
RENDER_IS_UNTRUSTED = 0x01,
RENDER_IGNORE_VIEWPORT_SCROLLING = 0x02,
RENDER_CARET = 0x04,
RENDER_USE_WIDGET_LAYERS = 0x08
};
NS_IMETHOD RenderDocument(const nsRect& aRect, PRUint32 aFlags,
nscolor aBackgroundColor,
gfxContext* aRenderedContext) = 0;
/**
* Renders a node aNode to a surface and returns it. The aRegion may be used
* to clip the rendering. This region is measured in device pixels from the
* edge of the presshell area. The aPoint, aScreenRect and aSurface
* arguments function in a similar manner as RenderSelection.
*/
virtual already_AddRefed<gfxASurface> RenderNode(nsIDOMNode* aNode,
nsIRegion* aRegion,
nsIntPoint& aPoint,
nsIntRect* aScreenRect) = 0;
/**
* Renders a selection to a surface and returns it. This method is primarily
* intended to create the drag feedback when dragging a selection.
*
* aScreenRect will be filled in with the bounding rectangle of the
* selection area on screen.
*
* If the area of the selection is large, the image will be scaled down.
* The argument aPoint is used in this case as a reference point when
* determining the new screen rectangle after scaling. Typically, this
* will be the mouse position, so that the screen rectangle is positioned
* such that the mouse is over the same point in the scaled image as in
* the original. When scaling does not occur, the mouse point isn't used
* as the position can be determined from the displayed frames.
*/
virtual already_AddRefed<gfxASurface> RenderSelection(nsISelection* aSelection,
nsIntPoint& aPoint,
nsIntRect* aScreenRect) = 0;
void AddWeakFrameInternal(nsWeakFrame* aWeakFrame);
virtual void AddWeakFrameExternal(nsWeakFrame* aWeakFrame);
void AddWeakFrame(nsWeakFrame* aWeakFrame)
{
#ifdef _IMPL_NS_LAYOUT
AddWeakFrameInternal(aWeakFrame);
#else
AddWeakFrameExternal(aWeakFrame);
#endif
}
void RemoveWeakFrameInternal(nsWeakFrame* aWeakFrame);
virtual void RemoveWeakFrameExternal(nsWeakFrame* aWeakFrame);
void RemoveWeakFrame(nsWeakFrame* aWeakFrame)
{
#ifdef _IMPL_NS_LAYOUT
RemoveWeakFrameInternal(aWeakFrame);
#else
RemoveWeakFrameExternal(aWeakFrame);
#endif
}
#ifdef NS_DEBUG
nsIFrame* GetDrawEventTargetFrame() { return mDrawEventTargetFrame; }
#endif
/**
* Stop or restart non synthetic test mouse event handling on *all*
* presShells.
*
* @param aDisable If true, disable all non synthetic test mouse
* events on all presShells. Otherwise, enable them.
*/
NS_IMETHOD DisableNonTestMouseEvents(PRBool aDisable) = 0;
/**
* Record the background color of the most recently drawn canvas. This color
* is composited on top of the user's default background color and then used
* to draw the background color of the canvas. See PresShell::Paint,
* PresShell::PaintDefaultBackground, and nsDocShell::SetupNewViewer;
* bug 488242, bug 476557 and other bugs mentioned there.
*/
void SetCanvasBackground(nscolor aColor) { mCanvasBackgroundColor = aColor; }
nscolor GetCanvasBackground() { return mCanvasBackgroundColor; }
/**
* Use the current frame tree (if it exists) to update the background
* color of the most recently drawn canvas.
*/
virtual void UpdateCanvasBackground() = 0;
/**
* Add a solid color item to the bottom of aList with frame aFrame and
* bounds aBounds. Checks first if this needs to be done by checking if
* aFrame is a canvas frame (if aForceDraw is true then this check is
* skipped). If aBounds is null (the default) then the bounds will be derived
* from the frame. aBackstopColor is composed behind the background color of
* the canvas, it is transparent by default.
*/
virtual nsresult AddCanvasBackgroundColorItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
nsRect* aBounds = nsnull,
nscolor aBackstopColor = NS_RGBA(0,0,0,0),
PRBool aForceDraw = PR_FALSE) = 0;
void ObserveNativeAnonMutationsForPrint(PRBool aObserve)
{
mObservesMutationsForPrint = aObserve;
}
PRBool ObservesNativeAnonMutationsForPrint()
{
return mObservesMutationsForPrint;
}
// mouse capturing
static CapturingContentInfo gCaptureInfo;
/**
* When capturing content is set, it traps all mouse events and retargets
* them at this content node. If capturing is not allowed
* (gCaptureInfo.mAllowed is false), then capturing is not set. However, if
* the CAPTURE_IGNOREALLOWED flag is set, the allowed state is ignored and
* capturing is set regardless. To disable capture, pass null for the value
* of aContent.
*
* If CAPTURE_RETARGETTOELEMENT is set, all mouse events are targeted at
* aContent only. Otherwise, mouse events are targeted at aContent or its
* descendants. That is, descendants of aContent receive mouse events as
* they normally would, but mouse events outside of aContent are retargeted
* to aContent.
*
* If CAPTURE_PREVENTDRAG is set then drags are prevented from starting while
* this capture is active.
*/
static void SetCapturingContent(nsIContent* aContent, PRUint8 aFlags);
/**
* Return the active content currently capturing the mouse if any.
*/
static nsIContent* GetCapturingContent()
{
return gCaptureInfo.mContent;
}
/**
* Allow or disallow mouse capturing.
*/
static void AllowMouseCapture(PRBool aAllowed)
{
gCaptureInfo.mAllowed = aAllowed;
}
/**
* Returns true if there is an active mouse capture that wants to prevent
* drags.
*/
static PRBool IsMouseCapturePreventingDrag()
{
return gCaptureInfo.mPreventDrag && gCaptureInfo.mContent;
}
protected:
// IMPORTANT: The ownership implicit in the following member variables
// has been explicitly checked. If you add any members to this class,
// please make the ownership explicit (pinkerton, scc).
// these are the same Document and PresContext owned by the DocViewer.
// we must share ownership.
nsIDocument* mDocument; // [STRONG]
nsPresContext* mPresContext; // [STRONG]
nsStyleSet* mStyleSet; // [OWNS]
nsCSSFrameConstructor* mFrameConstructor; // [STRONG]
nsIViewManager* mViewManager; // [WEAK] docViewer owns it so I don't have to
nsFrameSelection* mSelection;
nsFrameManagerBase mFrameManager; // [OWNS]
nsWeakPtr mForwardingContainer;
#ifdef NS_DEBUG
nsIFrame* mDrawEventTargetFrame;
#endif
PRPackedBool mStylesHaveChanged;
PRPackedBool mDidInitialReflow;
PRPackedBool mIsDestroying;
#ifdef ACCESSIBILITY
/**
* Call this when there have been significant changes in the rendering for
* a content subtree, so the matching accessibility subtree can be invalidated
*/
void InvalidateAccessibleSubtree(nsIContent *aContent);
#endif
// Set to true when the accessibility service is being used to mirror
// the dom/layout trees
PRPackedBool mIsAccessibilityActive;
PRPackedBool mObservesMutationsForPrint;
// A list of weak frames. This is a pointer to the last item in the list.
nsWeakFrame* mWeakFrames;
// Most recent canvas background color.
nscolor mCanvasBackgroundColor;
};
/**
* Create a new empty presentation shell. Upon success, call Init
* before attempting to use the shell.
*/
nsresult
NS_NewPresShell(nsIPresShell** aInstancePtrResult);
#endif /* nsIPresShell_h___ */
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