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gecko-dev/layout/base/nsIPresShell.h
erik%netscape.com a6910ae277 bug 71370; author=simon@softel.co.il; r=attinasi; sr=erik; implement bidi 
(bidirectional text) for languages such as Arabic and Hebrew; from IBM bidi
project; not part of build yet (due to #ifdef IBMBIDI)
2001-03-09 03:13:03 +00:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Steve Clark (buster@netscape.com)
*
* IBM Corporation
*
* 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
*/
#ifndef nsIPresShell_h___
#define nsIPresShell_h___
#include "nslayout.h"
#include "nsISupports.h"
#include "nsCoord.h"
#include "nsISelection.h"
#include "nsIReflowCommand.h"
#include "nsGUIEvent.h"
#include "nsISelectionController.h" //for the selection enums.
class nsIContent;
class nsIContentIterator;
class nsIDocument;
class nsIDocumentObserver;
class nsIFrame;
class nsIPresContext;
class nsIStyleSet;
class nsIViewManager;
class nsIDeviceContext;
class nsIRenderingContext;
class nsIPageSequenceFrame;
class nsString;
class nsStringArray;
class nsICaret;
class nsIStyleContext;
class nsIFrameSelection;
class nsIFrameManager;
class nsILayoutHistoryState;
class nsIArena;
class nsIReflowCallback;
class nsISupportsArray;
#define NS_IPRESSHELL_IID \
{ 0x76e79c60, 0x944e, 0x11d1, \
{0x93, 0x23, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32} }
// Constants uses for ScrollFrameIntoView() 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
// Observer related defines
#define NS_PRESSHELL_REFLOW_TOPIC "REFLOW" // Observer Topic
#define NS_PRESSHELL_INITIAL_REFLOW "INITIAL REFLOW" // Observer Data
#define NS_PRESSHELL_RESIZE_REFLOW "RESIZE REFLOW" // Observer Data
#define NS_PRESSHELL_STYLE_CHANGE_REFLOW "STYLE CHANGE REFLOW" // Observer Data
// 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_INCLUDE_SPACE_MANAGER 0x40
#define VERIFY_REFLOW_DURING_RESIZE_REFLOW 0x80
#ifdef IBMBIDI // Constant for Set/Get CursorBidiLevel
#define BIDI_LEVEL_UNDEFINED 0x80
#endif
// for PostAttributeChanged
enum nsAttributeChangeType {
eChangeType_Set = 0, // Set attribute
eChangeType_Remove = 1 // Remove attribute
};
/**
* 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.
*/
class nsIPresShell : public nsISupports {
public:
static const nsIID& GetIID() { static nsIID iid = NS_IPRESSHELL_IID; return iid; }
NS_IMETHOD Init(nsIDocument* aDocument,
nsIPresContext* aPresContext,
nsIViewManager* aViewManager,
nsIStyleSet* aStyleSet) = 0;
// All frames owned by the shell are allocated from an arena. They are also recycled
// using free lists (separate free lists being maintained for each size_t).
// Methods for recycling frames.
NS_IMETHOD AllocateFrame(size_t aSize, void** aResult) = 0;
NS_IMETHOD FreeFrame(size_t aSize, void* aFreeChunk) = 0;
// Dynamic stack memory allocation
NS_IMETHOD PushStackMemory() = 0;
NS_IMETHOD PopStackMemory() = 0;
NS_IMETHOD AllocateStackMemory(size_t aSize, void** aResult) = 0;
NS_IMETHOD GetDocument(nsIDocument** aResult) = 0;
NS_IMETHOD GetPresContext(nsIPresContext** aResult) = 0;
NS_IMETHOD GetViewManager(nsIViewManager** aResult) = 0;
NS_IMETHOD GetStyleSet(nsIStyleSet** aResult) = 0;
NS_IMETHOD GetActiveAlternateStyleSheet(nsString& aSheetTitle) = 0;
NS_IMETHOD SelectAlternateStyleSheet(const nsString& aSheetTitle) = 0;
/** 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;
/** Allow client to enable and disable the use of the preference style rules,
* by type.
* NOTE: type argument is currently ignored, but is in the API for
* future refinement
*
* - initially created for bugs 31816, 20760, 22963
*/
NS_IMETHOD EnablePrefStyleRules(PRBool aEnable, PRUint8 aPrefType=0xFF) = 0;
NS_IMETHOD ArePrefStyleRulesEnabled(PRBool& aEnabled) = 0;
/**
* Gather titles of all selectable (alternate and preferred) style sheets
* fills void array with nsString* caller must free strings
*/
NS_IMETHOD ListAlternateStyleSheets(nsStringArray& aTitleList) = 0;
/**
* GetFrameSelection will return the Frame based selection API you
* cannot go back and forth anymore with QI with nsIDOM sel and nsIFrame sel.
*/
NS_IMETHOD GetFrameSelection(nsIFrameSelection** aSelection) = 0;
// Make shell be a document observer
NS_IMETHOD BeginObservingDocument() = 0;
// Make shell stop being a document observer
NS_IMETHOD EndObservingDocument() = 0;
/**
* 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 nscoord's.
*/
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;
NS_IMETHOD GetRootFrame(nsIFrame** aFrame) const = 0;
/**
* 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 primary frame associated with the content object. This is a
* helper function that just forwards the request to the frame manager.
*
* The primary frame is the frame that is most closely associated with the
* content. A frame is more closely associated with the content that another
* frame if the one frame contains directly or indirectly the other frame (e.g.,
* when a frame is scrolled there is a scroll frame that contains the frame
* being scrolled). The primary frame is always the first-in-flow.
*
* In the case of absolutely positioned elements and floated elements,
* the primary frame is the frame that is out of the flow and not the
* placeholder frame.
*/
NS_IMETHOD GetPrimaryFrameFor(nsIContent* aContent,
nsIFrame** aPrimaryFrame) const = 0;
/** Returns the style context associated with the frame.
* Used by code outside of layout that can't use nsIFrame methods to get
* the style context directly.
*/
NS_IMETHOD GetStyleContextFor(nsIFrame* aFrame,
nsIStyleContext** aStyleContext) const = 0;
/**
* Returns a layout object associated with the primary frame for the content object.
*
* @param aContent the content object for which we seek a layout object
* @param aResult the resulting layout object as an nsISupports, if found. Refcounted.
*/
NS_IMETHOD GetLayoutObjectFor(nsIContent* aContent,
nsISupports** aResult) const = 0;
/**
* Returns the object that acts as a subshell for aContent.
* For example, for an html frame aResult will be an nsIDocShell.
*/
NS_IMETHOD GetSubShellFor(nsIContent* aContent,
nsISupports** aResult) const = 0;
/**
* Establish a relationship between aContent and aSubShell.
* aSubShell will be returned from GetSubShellFor(aContent, ...);
*/
NS_IMETHOD SetSubShellFor(nsIContent* aContent,
nsISupports* aSubShell) = 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;
/**
* Reflow commands
*/
NS_IMETHOD AppendReflowCommand(nsIReflowCommand* aReflowCommand) = 0;
NS_IMETHOD CancelReflowCommand(nsIFrame* aTargetFrame, nsIReflowCommand::ReflowType* aCmdType) = 0;
NS_IMETHOD CancelAllReflowCommands() = 0;
/**
* 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 all pending notifications such that the presentation is
* in sync with the content.
*/
NS_IMETHOD FlushPendingNotifications() = 0;
/**
* Post a request to handle a DOM event after Reflow has finished.
*/
NS_IMETHOD PostDOMEvent(nsIContent* aContent, nsEvent* aEvent)=0;
/**
* Post a request to set and attribute after reflow has finished.
*/
NS_IMETHOD PostAttributeChange(nsIContent* aContent,
PRInt32 aNameSpaceID,
nsIAtom* aName,
const nsString& aValue,
PRBool aNotify,
nsAttributeChangeType aType) = 0;
NS_IMETHOD PostReflowCallback(nsIReflowCallback* aCallback) = 0;
NS_IMETHOD CancelReflowCallback(nsIReflowCallback* aCallback) = 0;
/**
* Reflow batching
*/
NS_IMETHOD BeginReflowBatching() = 0;
NS_IMETHOD EndReflowBatching(PRBool aFlushPendingReflows) = 0;
NS_IMETHOD GetReflowBatchingStatus(PRBool* aIsBatching) = 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;
/**
* Notification that we were unable to render a replaced element.
* Called when the replaced element can not be rendered, and we should
* instead render the element's contents.
* The content object associated with aFrame should either be a IMG
* element, an OBJECT element, or an APPLET element
*/
NS_IMETHOD CantRenderReplacedElement(nsIPresContext* aPresContext,
nsIFrame* aFrame) = 0;
/**
* Scrolls the view of the document so that the anchor with the specified
* name is displayed at the top of the window
*/
NS_IMETHOD GoToAnchor(const nsString& aAnchorName) const = 0;
/**
* Scrolls the view of the document so that the frame is displayed at the
* top of the window.
*
* @param aFrame The frame to scroll 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 ScrollFrameIntoView(nsIFrame *aFrame,
PRIntn aVPercent,
PRIntn aHPercent) const = 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;
/**
* Returns the frame manager object
*/
NS_IMETHOD GetFrameManager(nsIFrameManager** aFrameManager) const = 0;
/**
* Notify the Clipboard that we have something to copy.
*/
NS_IMETHOD DoCopy() = 0;
/**
* Get the caret, if it exists. AddRefs it.
*/
NS_IMETHOD GetCaret(nsICaret **aOutCaret) = 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 SetDisplayNonTextSelection(PRBool 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 GetDisplayNonTextSelection(PRBool *aOutEnabled) = 0;
/**
* Interface to dispatch events via the presshell
*/
NS_IMETHOD HandleEventWithTarget(nsEvent* aEvent,
nsIFrame* aFrame,
nsIContent* aContent,
PRUint32 aFlags,
nsEventStatus* aStatus) = 0;
/**
* Dispatch event to content only (NOT full processing)
*/
NS_IMETHOD HandleDOMEventWithTarget(nsIContent* aTargetContent,
nsEvent* aEvent,
nsEventStatus* aStatus) = 0;
/**
* Gets the current target event frame from the PresShell
*/
NS_IMETHOD GetEventTargetFrame(nsIFrame** aFrame) = 0;
/**
* Get and set the history state for the current document
*/
NS_IMETHOD CaptureHistoryState(nsILayoutHistoryState** aLayoutHistoryState, PRBool aLeavingPage = PR_FALSE) = 0;
NS_IMETHOD GetHistoryState(nsILayoutHistoryState** aLayoutHistoryState) = 0;
NS_IMETHOD SetHistoryState(nsILayoutHistoryState* aLayoutHistoryState) = 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;
/**
* Returns a content iterator to iterate the generated content nodes.
* You must specify whether you want to iterate the "before" generated
* content or the "after" generated content. If there is no generated
* content of the specified type for the promary frame associated with
* with the content object then NULL is returned
*/
enum GeneratedContentType {Before, After};
NS_IMETHOD GetGeneratedContentIterator(nsIContent* aContent,
GeneratedContentType aType,
nsIContentIterator** aIterator) const = 0;
/**
* Store the nsIAnonymousContentCreator-generated anonymous
* content that's associated with an element.
* @param aContent the element with which the anonymous
* content is to be associated with
* @param aAnonymousElements an array of nsIContent
* objects, or null to indicate that any anonymous
* content should be dissociated from the aContent
*/
NS_IMETHOD SetAnonymousContentFor(nsIContent* aContent, nsISupportsArray* aAnonymousElements) = 0;
/**
* Retrieve the nsIAnonymousContentCreator-generated anonymous
* content that's associated with an element.
* @param aContent the element for which to retrieve the
* associated anonymous content
* @param aAnonymousElements an array of nsIContent objects,
* or null to indicate that there are no anonymous elements
* associated with aContent
*/
NS_IMETHOD GetAnonymousContentFor(nsIContent* aContent, nsISupportsArray** aAnonymousElements) = 0;
/**
* Release all nsIAnonymousContentCreator-generated
* anonymous content associated with the shell.
*/
NS_IMETHOD ReleaseAnonymousContent() = 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 NS_LAYOUT PRBool GetVerifyReflowEnable();
/**
* Set the verify-reflow enable flag.
*/
static NS_LAYOUT void SetVerifyReflowEnable(PRBool aEnabled);
/**
* Get the flags associated with the VerifyReflow debug tool
*/
static NS_LAYOUT PRInt32 GetVerifyReflowFlags();
#ifdef MOZ_REFLOW_PERF
NS_IMETHOD ClearTotals() = 0;
NS_IMETHOD DumpReflows() = 0;
NS_IMETHOD CountReflows(const char * aName, PRUint32 aType, nsIFrame * aFrame) = 0;
#endif
#ifdef IBMBIDI
/**
* SetCursorBidiLevel will set the Bidi embedding level for the cursor. 0-63
*/
NS_IMETHOD SetCursorBidiLevel(PRUint8 aLevel) = 0;
/**
* GetCursorBidiLevel will get the Bidi embedding level for the cursor. 0-63
*/
NS_IMETHOD GetCursorBidiLevel(PRUint8 *aOutLevel) = 0;
/**
* UndefineCursorBidiLevel will set the Bidi embedding level for the cursor to an out-of-range value
*/
NS_IMETHOD UndefineCursorBidiLevel(void) = 0;
/**
* Reconstruct and reflow frame model
*/
NS_IMETHOD BidiStyleChangeReflow(void) = 0;
#endif
};
/**
* Create a new empty presentation shell. Upon success, call Init
* before attempting to use the shell.
*/
extern NS_LAYOUT nsresult
NS_NewPresShell(nsIPresShell** aInstancePtrResult);
#endif /* nsIPresShell_h___ */
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