/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- * 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 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 "nsTHashtable.h" #include "nsHashKeys.h" #include "nsISupports.h" #include "nsQueryFrame.h" #include "nsCoord.h" #include "nsColor.h" #include "nsEvent.h" #include "nsCompatibility.h" #include "nsFrameManagerBase.h" #include "nsRect.h" #include "mozFlushType.h" #include "nsWeakReference.h" #include // for FILE definition #include "nsChangeHint.h" #include "nsGUIEvent.h" #include "nsInterfaceHashtable.h" #include "nsEventStates.h" #include "nsPresArena.h" class nsIContent; class nsIDocument; class nsIFrame; class nsPresContext; class nsStyleSet; class nsIViewManager; class nsIView; class nsRenderingContext; class nsIPageSequenceFrame; class nsAString; class nsCaret; class nsFrameSelection; class nsFrameManager; class nsILayoutHistoryState; class nsIReflowCallback; class nsIDOMNode; class nsIntRegion; class nsIStyleSheet; class nsCSSFrameConstructor; class nsISelection; template class nsCOMArray; class nsWeakFrame; class nsIScrollableFrame; class gfxASurface; class gfxContext; class nsIDOMEvent; class nsDisplayList; class nsDisplayListBuilder; class nsPIDOMWindow; struct nsPoint; struct nsIntPoint; struct nsIntRect; class nsRegion; class nsRefreshDriver; class nsARefreshObserver; #ifdef ACCESSIBILITY class nsAccessibilityService; class DocAccessible; #endif class nsIWidget; struct nsArenaMemoryStats; typedef short SelectionType; typedef uint64_t nsFrameState; namespace mozilla { namespace dom { class Element; } // namespace dom namespace layers{ class LayerManager; } // namespace layers } // namespace mozilla // 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 // true when the mouse is pointer locked, and events are sent to locked elemnt #define CAPTURE_POINTERLOCK 8 typedef struct CapturingContentInfo { // capture should only be allowed during a mousedown event bool mAllowed; bool mPointerLock; bool mRetargetToElement; bool mPreventDrag; nsIContent* mContent; } CapturingContentInfo; // 7E29E8A8-9C77-4445-A523-41B363E0C98A #define NS_IPRESSHELL_IID \ { 0x7e29e8a8, 0x9c77, 0x4445, \ { 0xa5, 0x23, 0x41, 0xb3, 0x63, 0xe0, 0xc9, 0x8a } } // 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.

* * 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 { protected: typedef mozilla::layers::LayerManager LayerManager; enum eRenderFlag { STATE_IGNORING_VIEWPORT_SCROLLING = 0x1 }; typedef uint8_t RenderFlags; // for storing the above flags public: virtual NS_HIDDEN_(nsresult) 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. */ virtual NS_HIDDEN_(void) Destroy() = 0; bool 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 (aID), which must always correspond * to the same aSize value. AllocateFrame returns zero-filled memory. * AllocateFrame is fallible, it returns nullptr on out-of-memory. */ void* AllocateFrame(nsQueryFrame::FrameIID aID, size_t aSize) { #ifdef DEBUG mPresArenaAllocCount++; #endif void* result = mFrameArena.AllocateByFrameID(aID, aSize); if (result) { memset(result, 0, aSize); } return result; } void FreeFrame(nsQueryFrame::FrameIID aID, void* aPtr) { #ifdef DEBUG mPresArenaAllocCount--; #endif if (PRESARENA_MUST_FREE_DURING_DESTROY || !mIsDestroying) mFrameArena.FreeByFrameID(aID, aPtr); } /** * This is for allocating other types of objects (not frames). Separate free * lists are maintained for each type (aID), which must always correspond to * the same aSize value. AllocateByObjectID returns zero-filled memory. * AllocateByObjectID is fallible, it returns nullptr on out-of-memory. */ void* AllocateByObjectID(nsPresArena::ObjectID aID, size_t aSize) { #ifdef DEBUG mPresArenaAllocCount++; #endif void* result = mFrameArena.AllocateByObjectID(aID, aSize); if (result) { memset(result, 0, aSize); } return result; } void FreeByObjectID(nsPresArena::ObjectID aID, void* aPtr) { #ifdef DEBUG mPresArenaAllocCount--; #endif if (PRESARENA_MUST_FREE_DURING_DESTROY || !mIsDestroying) mFrameArena.FreeByObjectID(aID, aPtr); } /** * Other objects closely related to the frame tree that are allocated * from a separate set of per-size free lists. Note that different types * of objects that has the same size are allocated from the same list. * AllocateMisc does *not* clear the memory that it returns. * AllocateMisc is fallible, it returns nullptr on out-of-memory. * * @deprecated use AllocateByObjectID/FreeByObjectID instead */ void* AllocateMisc(size_t aSize) { #ifdef DEBUG mPresArenaAllocCount++; #endif return mFrameArena.AllocateBySize(aSize); } void FreeMisc(size_t aSize, void* aPtr) { #ifdef DEBUG mPresArenaAllocCount--; #endif if (PRESARENA_MUST_FREE_DURING_DESTROY || !mIsDestroying) mFrameArena.FreeBySize(aSize, aPtr); } nsIDocument* GetDocument() const { return mDocument; } nsPresContext* GetPresContext() const { return mPresContext; } nsIViewManager* GetViewManager() const { return mViewManager; } #ifdef ACCESSIBILITY void SetAccDocument(DocAccessible* aAccDocument) { mAccDocument = aAccDocument; } #endif #ifdef _IMPL_NS_LAYOUT nsStyleSet* StyleSet() const { return mStyleSet; } nsCSSFrameConstructor* FrameConstructor() const { return mFrameConstructor; } nsFrameManager* FrameManager() const { // reinterpret_cast is valid since nsFrameManager does not add // any members over nsFrameManagerBase. return reinterpret_cast (const_cast(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(bool aDisabled); NS_HIDDEN_(bool) GetAuthorStyleDisabled() const; /* * 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 */ virtual NS_HIDDEN_(nsresult) SetPreferenceStyleRules(bool 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 FrameSelection(); /** * ConstFrameSelection returns an object which methods are safe to use for * example in nsIFrame code. */ const nsFrameSelection* ConstFrameSelection() const { return mSelection; } // Make shell be a document observer. If called after Destroy() has // been called on the shell, this will be ignored. virtual NS_HIDDEN_(void) BeginObservingDocument() = 0; // Make shell stop being a document observer virtual NS_HIDDEN_(void) EndObservingDocument() = 0; /** * Return whether Initialize() was previously called. */ bool DidInitialize() const { return mDidInitialize; } /** * Perform initialization. Constructs the frame for the root content * object and then enqueues a reflow of 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 Initialize can execute arbitrary script. */ virtual NS_HIDDEN_(nsresult) Initialize(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. */ virtual NS_HIDDEN_(nsresult) ResizeReflow(nscoord aWidth, nscoord aHeight) = 0; /** * Reflow, and also change presshell state so as to only permit * reflowing off calls to ResizeReflowOverride() in the future. * ResizeReflow() calls are ignored after ResizeReflowOverride(). */ virtual NS_HIDDEN_(nsresult) ResizeReflowOverride(nscoord aWidth, nscoord aHeight) = 0; /** * Returns true if ResizeReflowOverride has been called. */ virtual bool GetIsViewportOverridden() = 0; /** * Return true if the presshell expects layout flush. */ virtual bool IsLayoutFlushObserver() = 0; /** * Reflow the frame model with a reflow reason of eReflowReason_StyleChange */ virtual NS_HIDDEN_(void) StyleChangeReflow() = 0; /** * This calls through to the frame manager to get the root frame. */ virtual NS_HIDDEN_(nsIFrame*) GetRootFrameExternal() const; nsIFrame* GetRootFrame() const { #ifdef _IMPL_NS_LAYOUT return mFrameManager->GetRootFrame(); #else return GetRootFrameExternal(); #endif } /* * 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. */ virtual NS_HIDDEN_(nsIPageSequenceFrame*) GetPageSequenceFrame() 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. */ virtual NS_HIDDEN_(nsIFrame*) GetPlaceholderFrameFor(nsIFrame* aFrame) 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 }; virtual NS_HIDDEN_(void) 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. */ virtual NS_HIDDEN_(void) FrameNeedsToContinueReflow(nsIFrame *aFrame) = 0; virtual NS_HIDDEN_(void) CancelAllPendingReflows() = 0; /** * Recreates the frames for a node */ virtual NS_HIDDEN_(nsresult) RecreateFramesFor(nsIContent* aContent) = 0; void PostRecreateFramesFor(mozilla::dom::Element* aElement); void RestyleForAnimation(mozilla::dom::Element* aElement, nsRestyleHint aHint); /** * Determine if it is safe to flush all pending notifications * @param aIsSafeToFlush true if it is safe, false otherwise. * */ virtual NS_HIDDEN_(bool) IsSafeToFlush() const = 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 */ virtual NS_HIDDEN_(void) FlushPendingNotifications(mozFlushType aType) = 0; /** * Callbacks will be called even if reflow itself fails for * some reason. */ virtual NS_HIDDEN_(nsresult) PostReflowCallback(nsIReflowCallback* aCallback) = 0; virtual NS_HIDDEN_(void) CancelReflowCallback(nsIReflowCallback* aCallback) = 0; virtual NS_HIDDEN_(void) ClearFrameRefs(nsIFrame* aFrame) = 0; /** * Get a reference rendering context. This is a context that should not * be rendered to, but is suitable for measuring text and performing * other non-rendering operations. */ virtual already_AddRefed GetReferenceRenderingContext() = 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. */ virtual NS_HIDDEN_(nsresult) GoToAnchor(const nsAString& aAnchorName, bool 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. */ virtual NS_HIDDEN_(nsresult) ScrollToAnchor() = 0; enum { SCROLL_TOP = 0, SCROLL_BOTTOM = 100, SCROLL_LEFT = 0, SCROLL_RIGHT = 100, SCROLL_CENTER = 50, SCROLL_MINIMUM = -1 }; enum WhenToScroll { SCROLL_ALWAYS, SCROLL_IF_NOT_VISIBLE, SCROLL_IF_NOT_FULLY_VISIBLE }; typedef struct ScrollAxis { int16_t mWhereToScroll; WhenToScroll mWhenToScroll : 8; bool mOnlyIfPerceivedScrollableDirection : 1; /** * @param aWhere: Either a percentage or a special value. * nsIPresShell defines: * * (Default) SCROLL_MINIMUM = -1: The visible area is * scrolled to show the entire frame. If the frame is too * large, the top and left edges are given precedence. * * SCROLL_TOP = 0: The frame's upper edge is aligned with the * top edge of the visible area. * * SCROLL_BOTTOM = 100: The frame's bottom edge is aligned * with the bottom edge of the visible area. * * SCROLL_LEFT = 0: The frame's left edge is aligned with the * left edge of the visible area. * * SCROLL_RIGHT = 100: The frame's right edge is aligned with * the right edge of the visible area. * * SCROLL_CENTER = 50: The frame is centered along the axis * the ScrollAxis is used for. * * Other values are treated as a percentage, and the point * "percent" down the frame is placed at the point "percent" * down the visible area. * @param aWhen: * * (Default) SCROLL_IF_NOT_FULLY_VISIBLE: Move the frame only * if it is not fully visible (including if it's not visible * at all). Note that in this case if the frame is too large to * fit in view, it will only be scrolled if more of it can fit * than is already in view. * * SCROLL_IF_NOT_VISIBLE: Move the frame only if none of it * is visible. * * SCROLL_ALWAYS: Move the frame regardless of its current * visibility. * @param aOnlyIfPerceivedScrollableDirection: * If the direction is not a perceived scrollable direction (i.e. * no scrollbar showing and less than one device pixel of * scrollable distance), don't scroll. Defaults to false. */ ScrollAxis(int16_t aWhere = SCROLL_MINIMUM, WhenToScroll aWhen = SCROLL_IF_NOT_FULLY_VISIBLE, bool aOnlyIfPerceivedScrollableDirection = false) : mWhereToScroll(aWhere), mWhenToScroll(aWhen), mOnlyIfPerceivedScrollableDirection(aOnlyIfPerceivedScrollableDirection) {} } ScrollAxis; /** * 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 aVertical How to align the frame vertically and when to do so. * This is a ScrollAxis of Where and When. * @param aHorizontal How to align the frame horizontally and when to do so. * This is a ScrollAxis of Where and When. * @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. * If SCROLL_NO_PARENT_FRAMES is set then we only scroll * nodes in this document, not in any parent documents which * contain this document in a iframe or the like. */ virtual NS_HIDDEN_(nsresult) ScrollContentIntoView(nsIContent* aContent, ScrollAxis aVertical, ScrollAxis aHorizontal, uint32_t aFlags) = 0; enum { SCROLL_FIRST_ANCESTOR_ONLY = 0x01, SCROLL_OVERFLOW_HIDDEN = 0x02, SCROLL_NO_PARENT_FRAMES = 0x04 }; /** * 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 aVertical see ScrollContentIntoView and ScrollAxis * @param aHorizontal see ScrollContentIntoView and ScrollAxis * @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 * If SCROLL_NO_PARENT_FRAMES is set then we only scroll * nodes in this document, not in any parent documents which * contain this document in a iframe or the like. * @return true if any scrolling happened, false if no scrolling happened */ virtual bool ScrollFrameRectIntoView(nsIFrame* aFrame, const nsRect& aRect, ScrollAxis aVertical, ScrollAxis aHorizontal, uint32_t 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) const = 0; /** * Suppress notification of the frame manager that frames are * being destroyed. */ virtual NS_HIDDEN_(void) SetIgnoreFrameDestruction(bool 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 */ virtual NS_HIDDEN_(void) NotifyDestroyingFrame(nsIFrame* aFrame) = 0; /** * Get the caret, if it exists. AddRefs it. */ virtual NS_HIDDEN_(already_AddRefed) GetCaret() const = 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. */ virtual NS_HIDDEN_(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 aInEnable if true, visual selection effects are enabled * if false visual selection effects are disabled */ NS_IMETHOD SetSelectionFlags(int16_t aInEnable) = 0; /** * Gets the current state of non text selection effects * @return current state of non text selection, * as set by SetDisplayNonTextSelection */ int16_t GetSelectionFlags() const { return mSelectionFlags; } virtual nsISelection* GetCurrentSelection(SelectionType aType) = 0; /** * Interface to dispatch events via the presshell * @note The caller must have a strong reference to the PresShell. */ virtual NS_HIDDEN_(nsresult) 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. */ virtual NS_HIDDEN_(nsresult) 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. */ virtual NS_HIDDEN_(nsresult) HandleDOMEventWithTarget(nsIContent* aTargetContent, nsIDOMEvent* aEvent, nsEventStatus* aStatus) = 0; /** * Gets the current target event frame from the PresShell */ virtual NS_HIDDEN_(nsIFrame*) GetEventTargetFrame() = 0; /** * Gets the current target event frame from the PresShell */ virtual NS_HIDDEN_(already_AddRefed) GetEventTargetContent(nsEvent* aEvent) = 0; /** * Get and set the history state for the current document */ virtual NS_HIDDEN_(nsresult) CaptureHistoryState(nsILayoutHistoryState** aLayoutHistoryState, bool aLeavingPage = false) = 0; /** * Determine if reflow is currently locked * returns true if reflow is locked, false otherwise */ bool IsReflowLocked() const { return mIsReflowing; } /** * 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. */ bool IsPaintingSuppressed() const { return mPaintingSuppressed; } /** * Unsuppress painting. */ virtual NS_HIDDEN_(void) UnsuppressPainting() = 0; /** * Called to disable nsITheme support in a specific presshell. */ void DisableThemeSupport() { // Doesn't have to be dynamic. Just set the bool. mIsThemeSupportDisabled = true; } /** * Indicates whether theme support is enabled. */ bool IsThemeSupportEnabled() const { return !mIsThemeSupportDisabled; } /** * Get the set of agent style sheets for this presentation */ virtual nsresult GetAgentStyleSheets(nsCOMArray& aSheets) = 0; /** * Replace the set of agent style sheets */ virtual nsresult SetAgentStyleSheets(const nsCOMArray& 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; /** * Notify that a content node's state has changed */ virtual void ContentStateChanged(nsIDocument* aDocument, nsIContent* aContent, nsEventStates aStateMask) = 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 true. */ static bool GetVerifyReflowEnable(); /** * Set the verify-reflow enable flag. */ static void SetVerifyReflowEnable(bool aEnabled); virtual nsIFrame* GetAbsoluteContainingBlock(nsIFrame* aFrame); #ifdef MOZ_REFLOW_PERF virtual NS_HIDDEN_(void) DumpReflows() = 0; virtual NS_HIDDEN_(void) CountReflows(const char * aName, nsIFrame * aFrame) = 0; virtual NS_HIDDEN_(void) PaintCount(const char * aName, nsRenderingContext* aRenderingContext, nsPresContext * aPresContext, nsIFrame * aFrame, const nsPoint& aOffset, uint32_t aColor) = 0; virtual NS_HIDDEN_(void) SetPaintFrameCount(bool aOn) = 0; virtual bool IsPaintingFrameCounts() = 0; #endif #ifdef DEBUG // Debugging hooks virtual void ListStyleContexts(nsIFrame *aRootFrame, FILE *out, int32_t aIndent = 0) = 0; virtual void ListStyleSheets(FILE *out, int32_t aIndent = 0) = 0; virtual void VerifyStyleTree() = 0; #endif #ifdef ACCESSIBILITY /** * Return true if accessibility is active. */ static bool IsAccessibilityActive(); /** * Return accessibility service if accessibility is active. */ static nsAccessibilityService* AccService(); #endif /** * 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; bool IsFrozen() { return mFrozen; } /** * 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(bool 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. * set RENDER_ASYNC_DECODE_IMAGES to avoid having images synchronously * decoded during rendering. * (by default images decode synchronously with RenderDocument) * set RENDER_DOCUMENT_RELATIVE to interpret |aRect| relative to the * document instead of the CSS viewport * @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, RENDER_ASYNC_DECODE_IMAGES = 0x10, RENDER_DOCUMENT_RELATIVE = 0x20 }; virtual NS_HIDDEN_(nsresult) RenderDocument(const nsRect& aRect, uint32_t 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 CSS pixels from the * edge of the presshell area. The aPoint, aScreenRect and aSurface * arguments function in a similar manner as RenderSelection. */ virtual already_AddRefed RenderNode(nsIDOMNode* aNode, nsIntRegion* 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 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 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. */ virtual NS_HIDDEN_(void) DisableNonTestMouseEvents(bool 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 the FORCE_DRAW flag is passed then this check is skipped). * aBackstopColor is composed behind the background color of the canvas, it is * transparent by default. */ enum { FORCE_DRAW = 0x01 }; virtual nsresult AddCanvasBackgroundColorItem(nsDisplayListBuilder& aBuilder, nsDisplayList& aList, nsIFrame* aFrame, const nsRect& aBounds, nscolor aBackstopColor = NS_RGBA(0,0,0,0), uint32_t aFlags = 0) = 0; /** * Add a solid color item to the bottom of aList with frame aFrame and * bounds aBounds representing the dark grey background behind the page of a * print preview presentation. */ virtual nsresult AddPrintPreviewBackgroundItem(nsDisplayListBuilder& aBuilder, nsDisplayList& aList, nsIFrame* aFrame, const nsRect& aBounds) = 0; /** * Computes the backstop color for the view: transparent if in a transparent * widget, otherwise the PresContext default background color. This color is * only visible if the contents of the view as a whole are translucent. */ virtual nscolor ComputeBackstopColor(nsIView* aDisplayRoot) = 0; void ObserveNativeAnonMutationsForPrint(bool aObserve) { mObservesMutationsForPrint = aObserve; } bool ObservesNativeAnonMutationsForPrint() { return mObservesMutationsForPrint; } virtual nsresult SetIsActive(bool aIsActive) = 0; bool IsActive() { return mIsActive; } // mouse capturing static CapturingContentInfo gCaptureInfo; static nsInterfaceHashtable gCaptureTouchList; static bool gPreventMouseEvents; /** * 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. * * If CAPTURE_POINTERLOCK is set, similar to CAPTURE_RETARGETTOELEMENT, then * events are targeted at aContent, but capturing is held more strongly (i.e., * calls to SetCapturingContent won't unlock unless CAPTURE_POINTERLOCK is * set again). */ static void SetCapturingContent(nsIContent* aContent, uint8_t 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(bool aAllowed) { gCaptureInfo.mAllowed = aAllowed; } /** * Returns true if there is an active mouse capture that wants to prevent * drags. */ static bool IsMouseCapturePreventingDrag() { return gCaptureInfo.mPreventDrag && gCaptureInfo.mContent; } /** * Keep track of how many times this presshell has been rendered to * a window. */ uint64_t GetPaintCount() { return mPaintCount; } void IncrementPaintCount() { ++mPaintCount; } /** * Get the root DOM window of this presShell. */ virtual already_AddRefed GetRootWindow() = 0; /** * Get the layer manager for the widget of the root view, if it has * one. */ virtual LayerManager* GetLayerManager() = 0; /** * Track whether we're ignoring viewport scrolling for the purposes * of painting. If we are ignoring, then layers aren't clipped to * the CSS viewport and scrollbars aren't drawn. */ virtual void SetIgnoreViewportScrolling(bool aIgnore) = 0; bool IgnoringViewportScrolling() const { return mRenderFlags & STATE_IGNORING_VIEWPORT_SCROLLING; } /** * Set a "resolution" for the document, which if not 1.0 will * allocate more or fewer pixels for rescalable content by a factor * of |resolution| in both dimensions. Return NS_OK iff the * resolution bounds are sane, and the resolution of this was * actually updated. * * The resolution defaults to 1.0. */ virtual nsresult SetResolution(float aXResolution, float aYResolution) = 0; gfxSize GetResolution() { return gfxSize(mXResolution, mYResolution); } float GetXResolution() { return mXResolution; } float GetYResolution() { return mYResolution; } /** * Set the isFirstPaint flag. */ void SetIsFirstPaint(bool aIsFirstPaint) { mIsFirstPaint = aIsFirstPaint; } /** * Get the isFirstPaint flag. */ bool GetIsFirstPaint() const { return mIsFirstPaint; } /** * Dispatch a mouse move event based on the most recent mouse position if * this PresShell is visible. This is used when the contents of the page * moved (aFromScroll is false) or scrolled (aFromScroll is true). */ virtual void SynthesizeMouseMove(bool aFromScroll) = 0; enum PaintType { PaintType_Composite, /* Just composite the layers, don't do ThebesLayer painting. */ PaintType_NoComposite, /* Only paint ThebesLayers, don't composite. */ PaintType_Full /* Do a full transaction. */ }; virtual void Paint(nsIView* aViewToPaint, const nsRegion& aDirtyRegion, PaintType aType, bool aWillSendDidPaint) = 0; virtual nsresult HandleEvent(nsIFrame* aFrame, nsGUIEvent* aEvent, bool aDontRetargetEvents, nsEventStatus* aEventStatus) = 0; virtual bool ShouldIgnoreInvalidation() = 0; /** * Notify that the NS_WILL_PAINT event was received. Fires on every * visible presshell in the document tree. */ virtual void WillPaint(bool aWillSendDidPaint) = 0; /** * Notify that the NS_DID_PAINT event was received. Only fires on the * root pres shell. */ virtual void DidPaint() = 0; /** * Ensures that the refresh driver is running, and schedules a view * manager flush on the next tick. */ virtual void ScheduleViewManagerFlush() = 0; virtual void ClearMouseCaptureOnView(nsIView* aView) = 0; virtual bool IsVisible() = 0; virtual void DispatchSynthMouseMove(nsGUIEvent *aEvent, bool aFlushOnHoverChange) = 0; virtual void SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf, nsArenaMemoryStats *aArenaObjectsSize, size_t *aPresShellSize, size_t *aStyleSetsSize, size_t *aTextRunsSize, size_t *aPresContextSize) = 0; /** * Methods that retrieve the cached font inflation preferences. */ uint32_t FontSizeInflationEmPerLine() const { return mFontSizeInflationEmPerLine; } uint32_t FontSizeInflationMinTwips() const { return mFontSizeInflationMinTwips; } uint32_t FontSizeInflationLineThreshold() const { return mFontSizeInflationLineThreshold; } virtual void AddInvalidateHiddenPresShellObserver(nsRefreshDriver *aDriver) = 0; void InvalidatePresShellIfHidden(); /** * Refresh observer management. */ protected: virtual bool AddRefreshObserverExternal(nsARefreshObserver* aObserver, mozFlushType aFlushType); bool AddRefreshObserverInternal(nsARefreshObserver* aObserver, mozFlushType aFlushType); virtual bool RemoveRefreshObserverExternal(nsARefreshObserver* aObserver, mozFlushType aFlushType); bool RemoveRefreshObserverInternal(nsARefreshObserver* aObserver, mozFlushType aFlushType); public: bool AddRefreshObserver(nsARefreshObserver* aObserver, mozFlushType aFlushType) { #ifdef _IMPL_NS_LAYOUT return AddRefreshObserverInternal(aObserver, aFlushType); #else return AddRefreshObserverExternal(aObserver, aFlushType); #endif } bool RemoveRefreshObserver(nsARefreshObserver* aObserver, mozFlushType aFlushType) { #ifdef _IMPL_NS_LAYOUT return RemoveRefreshObserverInternal(aObserver, aFlushType); #else return RemoveRefreshObserverExternal(aObserver, aFlushType); #endif } /** * Initialize and shut down static variables. */ static void InitializeStatics(); static void ReleaseStatics(); // If a frame in the subtree rooted at aFrame is capturing the mouse then // clears that capture. static void ClearMouseCapture(nsIFrame* aFrame); void SetScrollPositionClampingScrollPortSize(nscoord aWidth, nscoord aHeight); bool IsScrollPositionClampingScrollPortSizeSet() { return mScrollPositionClampingScrollPortSizeSet; } nsSize GetScrollPositionClampingScrollPortSize() { NS_ASSERTION(mScrollPositionClampingScrollPortSizeSet, "asking for scroll port when its not set?"); return mScrollPositionClampingScrollPortSize; } virtual void WindowSizeMoveDone() = 0; virtual void SysColorChanged() = 0; virtual void ThemeChanged() = 0; nscoord MaxLineBoxWidth() { return mMaxLineBoxWidth; } void SetMaxLineBoxWidth(nscoord aMaxLineBoxWidth); protected: friend class nsRefreshDriver; // 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; // [OWNS] nsIViewManager* mViewManager; // [WEAK] docViewer owns it so I don't have to nsPresArena mFrameArena; nsFrameSelection* mSelection; // Pointer into mFrameConstructor - this is purely so that FrameManager() and // GetRootFrame() can be inlined: nsFrameManagerBase* mFrameManager; nsWeakPtr mForwardingContainer; nsRefreshDriver* mHiddenInvalidationObserverRefreshDriver; #ifdef ACCESSIBILITY DocAccessible* mAccDocument; #endif #ifdef DEBUG nsIFrame* mDrawEventTargetFrame; // Ensure that every allocation from the PresArena is eventually freed. uint32_t mPresArenaAllocCount; #endif // Count of the number of times this presshell has been painted to a window. uint64_t mPaintCount; nsSize mScrollPositionClampingScrollPortSize; // 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; // Used to force allocation and rendering of proportionally more or // less pixels in the given dimension. float mXResolution; float mYResolution; int16_t mSelectionFlags; // Flags controlling how our document is rendered. These persist // between paints and so are tied with retained layer pixels. // PresShell flushes retained layers when the rendering state // changes in a way that prevents us from being able to (usefully) // re-use old pixels. RenderFlags mRenderFlags; bool mStylesHaveChanged : 1; bool mDidInitialize : 1; bool mIsDestroying : 1; bool mIsReflowing : 1; // For all documents we initially lock down painting. bool mPaintingSuppressed : 1; // Whether or not form controls should use nsITheme in this shell. bool mIsThemeSupportDisabled : 1; bool mIsActive : 1; bool mFrozen : 1; bool mIsFirstPaint : 1; bool mObservesMutationsForPrint : 1; // If true, we have a reflow scheduled. Guaranteed to be false if // mReflowContinueTimer is non-null. bool mReflowScheduled : 1; bool mSuppressInterruptibleReflows : 1; bool mScrollPositionClampingScrollPortSizeSet : 1; static nsIContent* gKeyDownTarget; // Cached font inflation values. This is done to prevent changing of font // inflation until a page is reloaded. uint32_t mFontSizeInflationEmPerLine; uint32_t mFontSizeInflationMinTwips; uint32_t mFontSizeInflationLineThreshold; // The maximum width of a line box. Text on a single line that exceeds this // width will be wrapped. A value of 0 indicates that no limit is enforced. nscoord mMaxLineBoxWidth; }; /** * Create a new empty presentation shell. Upon success, call Init * before attempting to use the shell. */ nsresult NS_NewPresShell(nsIPresShell** aInstancePtrResult); #endif /* nsIPresShell_h___ */