зеркало из https://github.com/mozilla/pjs.git
506 строки
19 KiB
C++
506 строки
19 KiB
C++
/* -*- 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 mozila.org code.
|
|
*
|
|
* The Initial Developer of the Original Code is Mozilla Foundation
|
|
* Portions created by the Initial Developer are Copyright (C) 2008
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either 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 ***** */
|
|
|
|
#ifndef nsFocusManager_h___
|
|
#define nsFocusManager_h___
|
|
|
|
#include "nsIFocusManager.h"
|
|
#include "nsWeakReference.h"
|
|
#include "nsIObserver.h"
|
|
#include "nsIContent.h"
|
|
|
|
#define FOCUSMETHOD_MASK 0xF000
|
|
#define FOCUSMETHODANDRING_MASK 0xF0F000
|
|
|
|
#define FOCUSMANAGER_CONTRACTID "@mozilla.org/focus-manager;1"
|
|
|
|
class nsIDocShellTreeItem;
|
|
class nsPIDOMWindow;
|
|
struct nsDelayedBlurOrFocusEvent;
|
|
|
|
/**
|
|
* The focus manager keeps track of where the focus is, that is, the node
|
|
* which receives key events.
|
|
*/
|
|
|
|
class nsFocusManager : public nsIFocusManager,
|
|
public nsIFocusManager_MOZILLA_2_0_BRANCH,
|
|
public nsIObserver,
|
|
public nsSupportsWeakReference
|
|
{
|
|
public:
|
|
|
|
NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsFocusManager, nsIFocusManager)
|
|
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
|
|
NS_DECL_NSIOBSERVER
|
|
NS_DECL_NSIFOCUSMANAGER
|
|
NS_DECL_NSIFOCUSMANAGER_MOZILLA_2_0_BRANCH
|
|
|
|
// called to initialize and stop the focus manager at startup and shutdown
|
|
static nsresult Init();
|
|
static void Shutdown();
|
|
|
|
/**
|
|
* Retrieve the single focus manager.
|
|
*/
|
|
static nsFocusManager* GetFocusManager() { return sInstance; }
|
|
|
|
/**
|
|
* A faster version of nsIFocusManager::GetFocusedElement, returning a
|
|
* raw nsIContent pointer (instead of having AddRef-ed nsIDOMElement
|
|
* pointer filled in to an out-parameter).
|
|
*/
|
|
nsIContent* GetFocusedContent() { return mFocusedContent; }
|
|
|
|
/**
|
|
* Called when content has been removed.
|
|
*/
|
|
nsresult ContentRemoved(nsIDocument* aDocument, nsIContent* aContent);
|
|
|
|
/**
|
|
* Called when mouse button down event handling is started and finished.
|
|
*/
|
|
void SetMouseButtonDownHandlingDocument(nsIDocument* aDocument)
|
|
{
|
|
NS_ASSERTION(!aDocument || !mMouseDownEventHandlingDocument,
|
|
"Some mouse button down events are nested?");
|
|
mMouseDownEventHandlingDocument = aDocument;
|
|
}
|
|
|
|
/**
|
|
* Returns the content node that would be focused if aWindow was in an
|
|
* active window. This will traverse down the frame hierarchy, starting at
|
|
* the given window aWindow. Sets aFocusedWindow to the window with the
|
|
* document containing aFocusedContent. If no element is focused,
|
|
* aFocusedWindow may be still be set -- this means that the document is
|
|
* focused but no element within it is focused.
|
|
*
|
|
* aWindow and aFocusedWindow must both be non-null.
|
|
*/
|
|
static nsIContent* GetFocusedDescendant(nsPIDOMWindow* aWindow, PRBool aDeep,
|
|
nsPIDOMWindow** aFocusedWindow);
|
|
|
|
/**
|
|
* Returns the content node that focus will be redirected to if aContent was
|
|
* focused. This is used for the special case of certain XUL elements such
|
|
* as textboxes which redirect focus to an anonymous child.
|
|
*
|
|
* aContent must be non-null.
|
|
*
|
|
* XXXndeakin this should be removed eventually but I want to do that as
|
|
* followup work.
|
|
*/
|
|
static nsIContent* GetRedirectedFocus(nsIContent* aContent);
|
|
|
|
static PRBool sMouseFocusesFormControl;
|
|
|
|
protected:
|
|
|
|
nsFocusManager();
|
|
~nsFocusManager();
|
|
|
|
/**
|
|
* Ensure that the widget associated with the currently focused window is
|
|
* focused at the widget level.
|
|
*/
|
|
void EnsureCurrentWidgetFocused();
|
|
|
|
/**
|
|
* Blur whatever is currently focused and focus aNewContent. aFlags is a
|
|
* bitmask of the flags defined in nsIFocusManager. If aFocusChanged is
|
|
* true, then the focus has actually shifted and the caret position will be
|
|
* updated to the new focus, aNewContent will be scrolled into view (unless
|
|
* a flag disables this) and the focus method for the window will be updated.
|
|
* If aAdjustWidget is false, don't change the widget focus state.
|
|
*
|
|
* All actual focus changes must use this method to do so. (as opposed
|
|
* to those that update the focus in an inactive window for instance).
|
|
*/
|
|
void SetFocusInner(nsIContent* aNewContent, PRInt32 aFlags,
|
|
PRBool aFocusChanged, PRBool aAdjustWidget);
|
|
|
|
/**
|
|
* Returns true if aPossibleAncestor is the same as aWindow or an
|
|
* ancestor of aWindow.
|
|
*/
|
|
PRBool IsSameOrAncestor(nsPIDOMWindow* aPossibleAncestor,
|
|
nsPIDOMWindow* aWindow);
|
|
|
|
/**
|
|
* Returns the window that is the lowest common ancestor of both aWindow1
|
|
* and aWindow2, or null if they share no common ancestor.
|
|
*/
|
|
already_AddRefed<nsPIDOMWindow> GetCommonAncestor(nsPIDOMWindow* aWindow1,
|
|
nsPIDOMWindow* aWindow2);
|
|
|
|
/**
|
|
* When aNewWindow is focused, adjust the ancestors of aNewWindow so that they
|
|
* also have their corresponding frames focused. Thus, one can start at
|
|
* the active top-level window and navigate down the currently focused
|
|
* elements for each frame in the tree to get to aNewWindow.
|
|
*/
|
|
void AdjustWindowFocus(nsPIDOMWindow* aNewWindow, PRBool aCheckPermission);
|
|
|
|
/**
|
|
* Returns true if aWindow is visible.
|
|
*/
|
|
PRBool IsWindowVisible(nsPIDOMWindow* aWindow);
|
|
|
|
/**
|
|
* Returns true if aContent is a root element and not focusable.
|
|
* I.e., even if aContent is editable root element, this returns true when
|
|
* the document is in designMode.
|
|
*
|
|
* @param aContent must not be null and must be in a document.
|
|
*/
|
|
PRBool IsNonFocusableRoot(nsIContent* aContent);
|
|
|
|
/**
|
|
* Checks and returns aContent if it may be focused, another content node if
|
|
* the focus should be retargeted at another node, or null if the node
|
|
* cannot be focused. aFlags are the flags passed to SetFocus and similar
|
|
* methods.
|
|
*
|
|
* An element is focusable if it is in a document, the document isn't in
|
|
* print preview mode and the element has an nsIFrame where the
|
|
* CheckIfFocusable method returns true. For <area> elements, there is no
|
|
* frame, so only the IsFocusable method on the content node must be
|
|
* true.
|
|
*/
|
|
nsIContent* CheckIfFocusable(nsIContent* aContent, PRUint32 aFlags);
|
|
|
|
/**
|
|
* Blurs the currently focused element. Returns false if another element was
|
|
* focused as a result. This would mean that the caller should not proceed
|
|
* with a pending call to Focus. Normally, true would be returned.
|
|
*
|
|
* The currently focused element within aWindowToClear will be cleared.
|
|
* aWindowToClear may be null, which means that no window is cleared. This
|
|
* will be the case, for example, when lowering a window, as we want to fire
|
|
* a blur, but not actually change what element would be focused, so that
|
|
* the same element will be focused again when the window is raised.
|
|
*
|
|
* aAncestorWindowToFocus should be set to the common ancestor of the window
|
|
* that is being blurred and the window that is going to focused, when
|
|
* switching focus to a sibling window.
|
|
*
|
|
* aIsLeavingDocument should be set to true if the document/window is being
|
|
* blurred as well. Document/window blur events will be fired. It should be
|
|
* false if an element is the same document is about to be focused.
|
|
*
|
|
* If aAdjustWidget is false, don't change the widget focus state.
|
|
*/
|
|
PRBool Blur(nsPIDOMWindow* aWindowToClear,
|
|
nsPIDOMWindow* aAncestorWindowToFocus,
|
|
PRBool aIsLeavingDocument,
|
|
PRBool aAdjustWidget);
|
|
|
|
/**
|
|
* Focus an element in the active window and child frame.
|
|
*
|
|
* aWindow is the window containing the element aContent to focus.
|
|
*
|
|
* aFlags is the flags passed to the various focus methods in
|
|
* nsIFocusManager.
|
|
*
|
|
* aIsNewDocument should be true if a new document is being focused.
|
|
* Document/window focus events will be fired.
|
|
*
|
|
* aFocusChanged should be true if a new content node is being focused, so
|
|
* the focused content will be scrolled into view and the caret position
|
|
* will be updated. If false is passed, then a window is simply being
|
|
* refocused, for instance, due to a window being raised, or a tab is being
|
|
* switched to.
|
|
*
|
|
* If aFocusChanged is true, then the focus has moved to a new location.
|
|
* Otherwise, the focus is just being updated because the window was
|
|
* raised.
|
|
*
|
|
* aWindowRaised should be true if the window is being raised. In this case,
|
|
* command updaters will not be called.
|
|
*
|
|
* If aAdjustWidget is false, don't change the widget focus state.
|
|
*/
|
|
void Focus(nsPIDOMWindow* aWindow,
|
|
nsIContent* aContent,
|
|
PRUint32 aFlags,
|
|
PRBool aIsNewDocument,
|
|
PRBool aFocusChanged,
|
|
PRBool aWindowRaised,
|
|
PRBool aAdjustWidget);
|
|
|
|
/**
|
|
* Fires a focus or blur event at aTarget.
|
|
*
|
|
* aType should be either NS_FOCUS_CONTENT or NS_BLUR_CONTENT. For blur
|
|
* events, aFocusMethod should normally be non-zero.
|
|
*
|
|
* aWindowRaised should only be true if called from WindowRaised.
|
|
*/
|
|
void SendFocusOrBlurEvent(PRUint32 aType,
|
|
nsIPresShell* aPresShell,
|
|
nsIDocument* aDocument,
|
|
nsISupports* aTarget,
|
|
PRUint32 aFocusMethod,
|
|
PRBool aWindowRaised,
|
|
PRBool aIsRefocus = PR_FALSE);
|
|
|
|
/**
|
|
* Scrolls aContent into view unless the FLAG_NOSCROLL flag is set.
|
|
*/
|
|
void ScrollIntoView(nsIPresShell* aPresShell,
|
|
nsIContent* aContent,
|
|
PRUint32 aFlags);
|
|
|
|
/**
|
|
* Raises the top-level window aWindow at the widget level.
|
|
*/
|
|
void RaiseWindow(nsPIDOMWindow* aWindow);
|
|
|
|
/**
|
|
* Updates the caret positon and visibility to match the focus.
|
|
*
|
|
* aMoveCaretToFocus should be true to move the caret to aContent.
|
|
*
|
|
* aUpdateVisibility should be true to update whether the caret is
|
|
* visible or not.
|
|
*/
|
|
void UpdateCaret(PRBool aMoveCaretToFocus,
|
|
PRBool aUpdateVisibility,
|
|
nsIContent* aContent);
|
|
|
|
/**
|
|
* Helper method to move the caret to the focused element aContent.
|
|
*/
|
|
void MoveCaretToFocus(nsIPresShell* aPresShell, nsIContent* aContent);
|
|
|
|
/**
|
|
* Makes the caret visible or not, depending on aVisible.
|
|
*/
|
|
nsresult SetCaretVisible(nsIPresShell* aPresShell,
|
|
PRBool aVisible,
|
|
nsIContent* aContent);
|
|
|
|
|
|
// the remaining functions are used for tab key and document-navigation
|
|
|
|
/**
|
|
* Retrieves the start and end points of the current selection for
|
|
* aDocument and stores them in aStartContent and aEndContent.
|
|
*/
|
|
nsresult GetSelectionLocation(nsIDocument* aDocument,
|
|
nsIPresShell* aPresShell,
|
|
nsIContent **aStartContent,
|
|
nsIContent **aEndContent);
|
|
|
|
/**
|
|
* Helper function for MoveFocus which determines the next element
|
|
* to move the focus to and returns it in aNextContent.
|
|
*
|
|
* aWindow is the window to adjust the focus within, and aStart is
|
|
* the element to start navigation from. For tab key navigation,
|
|
* this should be the currently focused element.
|
|
*
|
|
* aType is the type passed to MoveFocus.
|
|
*/
|
|
nsresult DetermineElementToMoveFocus(nsPIDOMWindow* aWindow,
|
|
nsIContent* aStart,
|
|
PRInt32 aType,
|
|
nsIContent** aNextContent);
|
|
|
|
/**
|
|
* Retrieve the next tabbable element within a document, using focusability
|
|
* and tabindex to determine the tab order. The element is returned in
|
|
* aResultContent.
|
|
*
|
|
* aRootContent is the root node -- nodes above this will not be examined.
|
|
* Typically this will be the root node of a document, but could also be
|
|
* a popup node.
|
|
*
|
|
* aOriginalStartContent is the content which was originally the starting
|
|
* node, in the case of recursive or looping calls.
|
|
*
|
|
* aStartContent is the starting point for this call of this method.
|
|
* If aStartContent doesn't have visual representation, the next content
|
|
* object, which does have a primary frame, will be used as a start.
|
|
* If that content object is focusable, the method may return it.
|
|
*
|
|
* aForward should be true for forward navigation or false for backward
|
|
* navigation.
|
|
*
|
|
* aCurrentTabIndex is the current tabindex.
|
|
*
|
|
* aIgnoreTabIndex to ignore the current tabindex and find the element
|
|
* irrespective or the tab index. This will be true when a selection is
|
|
* active, since we just want to focus the next element in tree order
|
|
* from where the selection is. Similarly, if the starting element isn't
|
|
* focusable, since it doesn't really have a defined tab index.
|
|
*/
|
|
nsresult GetNextTabbableContent(nsIPresShell* aPresShell,
|
|
nsIContent* aRootContent,
|
|
nsIContent* aOriginalStartContent,
|
|
nsIContent* aStartContent,
|
|
PRBool aForward,
|
|
PRInt32 aCurrentTabIndex,
|
|
PRBool aIgnoreTabIndex,
|
|
nsIContent** aResultContent);
|
|
|
|
/**
|
|
* Get the next tabbable image map area and returns it.
|
|
*
|
|
* aForward should be true for forward navigation or false for backward
|
|
* navigation.
|
|
*
|
|
* aCurrentTabIndex is the current tabindex.
|
|
*
|
|
* aImageContent is the image.
|
|
*
|
|
* aStartContent is the current image map area.
|
|
*/
|
|
nsIContent* GetNextTabbableMapArea(PRBool aForward,
|
|
PRInt32 aCurrentTabIndex,
|
|
nsIContent* aImageContent,
|
|
nsIContent* aStartContent);
|
|
|
|
/**
|
|
* Return the next valid tabindex value after aCurrentTabIndex, if aForward
|
|
* is true, or the previous tabindex value if aForward is false. aParent is
|
|
* the node from which to start looking for tab indicies.
|
|
*/
|
|
PRInt32 GetNextTabIndex(nsIContent* aParent,
|
|
PRInt32 aCurrentTabIndex,
|
|
PRBool aForward);
|
|
|
|
/**
|
|
* Retrieves and returns the root node from aDocument to be focused. Will
|
|
* return null if the root node cannot be focused. There are several reasons
|
|
* for this:
|
|
*
|
|
* - if aIsForDocNavigation is true, and aWindow is in an <iframe>.
|
|
* - if aIsForDocNavigation is false, and aWindow is a chrome shell.
|
|
* - if aCheckVisibility is true and the aWindow is not visible.
|
|
* - if aDocument is a frameset document.
|
|
*/
|
|
nsIContent* GetRootForFocus(nsPIDOMWindow* aWindow,
|
|
nsIDocument* aDocument,
|
|
PRBool aIsForDocNavigation,
|
|
PRBool aCheckVisibility);
|
|
|
|
/**
|
|
* Get the last docshell child of aItem and return it in aResult.
|
|
*/
|
|
void GetLastDocShell(nsIDocShellTreeItem* aItem,
|
|
nsIDocShellTreeItem** aResult);
|
|
|
|
/**
|
|
* Get the next docshell child of aItem and return it in aResult.
|
|
*/
|
|
void GetNextDocShell(nsIDocShellTreeItem* aItem,
|
|
nsIDocShellTreeItem** aResult);
|
|
|
|
/**
|
|
* Get the previous docshell child of aItem and return it in aResult.
|
|
*/
|
|
void GetPreviousDocShell(nsIDocShellTreeItem* aItem,
|
|
nsIDocShellTreeItem** aResult);
|
|
|
|
/**
|
|
* Get the tabbable next document from the currently focused frame if
|
|
* aForward is true, or the previously tabbable document if aForward is
|
|
* false. If this document is a chrome or frameset document, returns
|
|
* the first focusable element within this document, otherwise, returns
|
|
* the root node of the document.
|
|
*
|
|
* This method would be used for document navigation, which is typically
|
|
* invoked by pressing F6.
|
|
*/
|
|
nsIContent* GetNextTabbableDocument(PRBool aForward);
|
|
|
|
/**
|
|
* Retreives a focusable element within the current selection of aWindow.
|
|
* Currently, this only detects links.
|
|
*
|
|
* This is used when MoveFocus is called with a type of MOVEFOCUS_CARET,
|
|
* which is used, for example, to focus links as the caret is moved over
|
|
* them.
|
|
*/
|
|
void GetFocusInSelection(nsPIDOMWindow* aWindow,
|
|
nsIContent* aStartSelection,
|
|
nsIContent* aEndSelection,
|
|
nsIContent** aFocusedContent);
|
|
|
|
// the currently active and front-most top-most window
|
|
nsCOMPtr<nsPIDOMWindow> mActiveWindow;
|
|
|
|
// the child or top-level window that is currently focused. This window will
|
|
// either be the same window as mActiveWindow or a descendant of it.
|
|
nsCOMPtr<nsPIDOMWindow> mFocusedWindow;
|
|
|
|
// the currently focused content, which is always inside mFocusedWindow. This
|
|
// is a cached copy of the mFocusedWindow's current content. This may be null
|
|
// if no content is focused.
|
|
nsCOMPtr<nsIContent> mFocusedContent;
|
|
|
|
// these fields store a content node temporarily while it is being focused
|
|
// or blurred to ensure that a recursive call doesn't refire the same event.
|
|
// They will always be cleared afterwards.
|
|
nsCOMPtr<nsIContent> mFirstBlurEvent;
|
|
nsCOMPtr<nsIContent> mFirstFocusEvent;
|
|
|
|
// keep track of a window while it is being lowered
|
|
nsCOMPtr<nsPIDOMWindow> mWindowBeingLowered;
|
|
|
|
// synchronized actions cannot be interrupted with events, so queue these up
|
|
// and fire them later.
|
|
nsTArray<nsDelayedBlurOrFocusEvent> mDelayedBlurFocusEvents;
|
|
|
|
// A document which is handling a mouse button down event.
|
|
// When a mouse down event process is finished, ESM sets focus to the target
|
|
// content. Therefore, while DOM event handlers are handling mouse down
|
|
// events, the handlers should be able to steal focus from any elements even
|
|
// if focus is in chrome content. So, if this isn't NULL and the caller
|
|
// can access the document node, the caller should succeed in moving focus.
|
|
nsCOMPtr<nsIDocument> mMouseDownEventHandlingDocument;
|
|
|
|
// the single focus manager
|
|
static nsFocusManager* sInstance;
|
|
};
|
|
|
|
nsresult
|
|
NS_NewFocusManager(nsIFocusManager** aResult);
|
|
|
|
#endif
|