зеркало из https://github.com/mozilla/pjs.git
477 строки
18 KiB
C++
477 строки
18 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozila.org code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation
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* Portions created by the Initial Developer are Copyright (C) 2008
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsFocusManager_h___
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#define nsFocusManager_h___
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#include "nsIFocusManager.h"
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#include "nsWeakReference.h"
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#include "nsIObserver.h"
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#include "nsIContent.h"
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#define FOCUSMETHOD_MASK 0xF000
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#define FOCUSMETHODANDRING_MASK 0xF0F000
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#define FOCUSMANAGER_CONTRACTID "@mozilla.org/focus-manager;1"
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class nsIDocShellTreeItem;
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class nsPIDOMWindow;
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struct nsDelayedBlurOrFocusEvent;
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/**
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* The focus manager keeps track of where the focus is, that is, the node
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* which receives key events.
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*/
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class nsFocusManager : public nsIFocusManager,
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public nsIObserver,
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public nsSupportsWeakReference
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{
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public:
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NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsFocusManager, nsIFocusManager)
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_NSIOBSERVER
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NS_DECL_NSIFOCUSMANAGER
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// called to initialize and stop the focus manager at startup and shutdown
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static nsresult Init();
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static void Shutdown();
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/**
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* Retrieve the single focus manager.
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*/
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static nsFocusManager* GetFocusManager() { return sInstance; }
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/**
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* A faster version of nsIFocusManager::GetFocusedElement, returning a
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* raw nsIContent pointer (instead of having AddRef-ed nsIDOMElement
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* pointer filled in to an out-parameter).
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*/
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nsIContent* GetFocusedContent() { return mFocusedContent; }
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/**
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* Called when content has been removed.
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*/
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nsresult ContentRemoved(nsIDocument* aDocument, nsIContent* aContent);
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/**
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* Returns the content node that would be focused if aWindow was in an
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* active window. This will traverse down the frame hierarchy, starting at
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* the given window aWindow. Sets aFocusedWindow to the window with the
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* document containing aFocusedContent. If no element is focused,
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* aFocusedWindow may be still be set -- this means that the document is
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* focused but no element within it is focused.
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*
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* aWindow and aFocusedWindow must both be non-null.
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*/
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static nsIContent* GetFocusedDescendant(nsPIDOMWindow* aWindow, PRBool aDeep,
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nsPIDOMWindow** aFocusedWindow);
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/**
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* Returns the content node that focus will be redirected to if aContent was
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* focused. This is used for the special case of certain XUL elements such
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* as textboxes which redirect focus to an anonymous child.
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*
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* aContent must be non-null.
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*
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* XXXndeakin this should be removed eventually but I want to do that as
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* followup work.
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*/
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static nsIContent* GetRedirectedFocus(nsIContent* aContent);
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static PRBool sMouseFocusesFormControl;
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protected:
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nsFocusManager();
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~nsFocusManager();
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/**
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* Ensure that the widget associated with the currently focused window is
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* focused at the widget level.
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*/
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void EnsureCurrentWidgetFocused();
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/**
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* Blur whatever is currently focused and focus aNewContent. aFlags is a
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* bitmask of the flags defined in nsIFocusManager. If aFocusChanged is
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* true, then the focus has actually shifted and the caret position will be
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* updated to the new focus, aNewContent will be scrolled into view (unless
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* a flag disables this) and the focus method for the window will be updated.
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*
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* All actual focus changes must use this method to do so. (as opposed
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* to those that update the focus in an inactive window for instance).
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*/
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void SetFocusInner(nsIContent* aNewContent, PRInt32 aFlags, PRBool aFocusChanged);
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/**
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* Returns true if aPossibleAncestor is the same as aWindow or an
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* ancestor of aWindow.
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*/
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PRBool IsSameOrAncestor(nsPIDOMWindow* aPossibleAncestor,
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nsPIDOMWindow* aWindow);
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/**
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* Returns the window that is the lowest common ancestor of both aWindow1
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* and aWindow2, or null if they share no common ancestor.
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*/
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already_AddRefed<nsPIDOMWindow> GetCommonAncestor(nsPIDOMWindow* aWindow1,
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nsPIDOMWindow* aWindow2);
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/**
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* When aNewWindow is focused, adjust the ancestors of aNewWindow so that they
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* also have their corresponding frames focused. Thus, one can start at
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* the active top-level window and navigate down the currently focused
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* elements for each frame in the tree to get to aNewWindow.
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*/
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void AdjustWindowFocus(nsPIDOMWindow* aNewWindow, PRBool aCheckPermission);
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/**
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* Returns true if aWindow is visible.
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*/
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PRBool IsWindowVisible(nsPIDOMWindow* aWindow);
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/**
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* Returns true if aContent is a root element and not focusable.
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* I.e., even if aContent is editable root element, this returns true when
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* the document is in designMode.
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*
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* @param aContent must not be null and must be in a document.
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*/
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PRBool IsNonFocusableRoot(nsIContent* aContent);
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/**
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* Checks and returns aContent if it may be focused, another content node if
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* the focus should be retargeted at another node, or null if the node
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* cannot be focused. aFlags are the flags passed to SetFocus and similar
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* methods.
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*
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* An element is focusable if it is in a document, the document isn't in
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* print preview mode and the element has an nsIFrame where the
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* CheckIfFocusable method returns true. For <area> elements, there is no
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* frame, so only the IsFocusable method on the content node must be
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* true.
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*/
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nsIContent* CheckIfFocusable(nsIContent* aContent, PRUint32 aFlags);
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/**
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* Blurs the currently focused element. Returns false if another element was
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* focused as a result. This would mean that the caller should not proceed
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* with a pending call to Focus. Normally, true would be returned.
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*
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* The currently focused element within aWindowToClear will be cleared.
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* aWindowToClear may be null, which means that no window is cleared. This
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* will be the case, for example, when lowering a window, as we want to fire
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* a blur, but not actually change what element would be focused, so that
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* the same element will be focused again when the window is raised.
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*
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* aAncestorWindowToFocus should be set to the common ancestor of the window
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* that is being blurred and the window that is going to focused, when
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* switching focus to a sibling window.
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*
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* aIsLeavingDocument should be set to true if the document/window is being
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* blurred as well. Document/window blur events will be fired. It should be
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* false if an element is the same document is about to be focused.
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*/
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PRBool Blur(nsPIDOMWindow* aWindowToClear,
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nsPIDOMWindow* aAncestorWindowToFocus,
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PRBool aIsLeavingDocument);
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/**
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* Focus an element in the active window and child frame.
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*
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* aWindow is the window containing the element aContent to focus.
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*
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* aFlags is the flags passed to the various focus methods in
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* nsIFocusManager.
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*
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* aIsNewDocument should be true if a new document is being focused.
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* Document/window focus events will be fired.
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*
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* aFocusChanged should be true if a new content node is being focused, so
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* the focused content will be scrolled into view and the caret position
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* will be updated. If false is passed, then a window is simply being
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* refocused, for instance, due to a window being raised, or a tab is being
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* switched to.
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*
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* If aFocusChanged is true, then the focus has moved to a new location.
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* Otherwise, the focus is just being updated because the window was
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* raised.
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*
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* aWindowRaised should be true if the window is being raised. In this case,
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* command updaters will not be called.
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*/
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void Focus(nsPIDOMWindow* aWindow,
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nsIContent* aContent,
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PRUint32 aFlags,
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PRBool aIsNewDocument,
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PRBool aFocusChanged,
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PRBool aWindowRaised);
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/**
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* Fires a focus or blur event at aTarget.
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*
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* aType should be either NS_FOCUS_CONTENT or NS_BLUR_CONTENT. For blur
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* events, aFocusMethod should normally be non-zero.
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*
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* aWindowRaised should only be true if called from WindowRaised.
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*/
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void SendFocusOrBlurEvent(PRUint32 aType,
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nsIPresShell* aPresShell,
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nsIDocument* aDocument,
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nsISupports* aTarget,
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PRUint32 aFocusMethod,
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PRBool aWindowRaised);
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/**
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* Scrolls aContent into view unless the FLAG_NOSCROLL flag is set.
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*/
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void ScrollIntoView(nsIPresShell* aPresShell,
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nsIContent* aContent,
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PRUint32 aFlags);
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/**
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* Raises the top-level window aWindow at the widget level.
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*/
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void RaiseWindow(nsPIDOMWindow* aWindow);
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/**
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* Updates the caret positon and visibility to match the focus.
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*
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* aMoveCaretToFocus should be true to move the caret to aContent.
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*
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* aUpdateVisibility should be true to update whether the caret is
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* visible or not.
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*/
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void UpdateCaret(PRBool aMoveCaretToFocus,
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PRBool aUpdateVisibility,
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nsIContent* aContent);
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/**
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* Helper method to move the caret to the focused element aContent.
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*/
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void MoveCaretToFocus(nsIPresShell* aPresShell, nsIContent* aContent);
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/**
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* Makes the caret visible or not, depending on aVisible.
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*/
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nsresult SetCaretVisible(nsIPresShell* aPresShell,
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PRBool aVisible,
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nsIContent* aContent);
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// the remaining functions are used for tab key and document-navigation
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/**
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* Retrieves the start and end points of the current selection for
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* aDocument and stores them in aStartContent and aEndContent.
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*/
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nsresult GetSelectionLocation(nsIDocument* aDocument,
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nsIPresShell* aPresShell,
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nsIContent **aStartContent,
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nsIContent **aEndContent);
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/**
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* Helper function for MoveFocus which determines the next element
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* to move the focus to and returns it in aNextContent.
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*
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* aWindow is the window to adjust the focus within, and aStart is
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* the element to start navigation from. For tab key navigation,
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* this should be the currently focused element.
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*
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* aType is the type passed to MoveFocus.
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*/
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nsresult DetermineElementToMoveFocus(nsPIDOMWindow* aWindow,
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nsIContent* aStart,
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PRInt32 aType,
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nsIContent** aNextContent);
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/**
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* Retrieve the next tabbable element within a document, using focusability
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* and tabindex to determine the tab order. The element is returned in
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* aResultContent.
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*
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* aRootContent is the root node -- nodes above this will not be examined.
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* Typically this will be the root node of a document, but could also be
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* a popup node.
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*
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* aOriginalStartContent is the content which was originally the starting
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* node, in the case of recursive or looping calls.
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*
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* aStartContent is the starting point for this call of this method.
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* If aStartContent doesn't have visual representation, the next content
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* object, which does have a primary frame, will be used as a start.
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* If that content object is focusable, the method may return it.
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*
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* aForward should be true for forward navigation or false for backward
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* navigation.
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*
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* aCurrentTabIndex is the current tabindex.
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*
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* aIgnoreTabIndex to ignore the current tabindex and find the element
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* irrespective or the tab index. This will be true when a selection is
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* active, since we just want to focus the next element in tree order
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* from where the selection is. Similarly, if the starting element isn't
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* focusable, since it doesn't really have a defined tab index.
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*/
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nsresult GetNextTabbableContent(nsIPresShell* aPresShell,
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nsIContent* aRootContent,
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nsIContent* aOriginalStartContent,
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nsIContent* aStartContent,
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PRBool aForward,
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PRInt32 aCurrentTabIndex,
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PRBool aIgnoreTabIndex,
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nsIContent** aResultContent);
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/**
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* Get the next tabbable image map area and returns it.
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*
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* aForward should be true for forward navigation or false for backward
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* navigation.
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*
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* aCurrentTabIndex is the current tabindex.
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*
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* aImageContent is the image.
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*
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* aStartContent is the current image map area.
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*/
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nsIContent* GetNextTabbableMapArea(PRBool aForward,
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PRInt32 aCurrentTabIndex,
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nsIContent* aImageContent,
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nsIContent* aStartContent);
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/**
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* Return the next valid tabindex value after aCurrentTabIndex, if aForward
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* is true, or the previous tabindex value if aForward is false. aParent is
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* the node from which to start looking for tab indicies.
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*/
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PRInt32 GetNextTabIndex(nsIContent* aParent,
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PRInt32 aCurrentTabIndex,
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PRBool aForward);
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/**
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* Retrieves and returns the root node from aDocument to be focused. Will
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* return null if the root node cannot be focused. There are several reasons
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* for this:
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*
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* - if aIsForDocNavigation is true, and aWindow is in an <iframe>.
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* - if aIsForDocNavigation is false, and aWindow is a chrome shell.
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* - if aCheckVisibility is true and the aWindow is not visible.
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* - if aDocument is a frameset document.
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*/
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nsIContent* GetRootForFocus(nsPIDOMWindow* aWindow,
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nsIDocument* aDocument,
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PRBool aIsForDocNavigation,
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PRBool aCheckVisibility);
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/**
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* Get the last docshell child of aItem and return it in aResult.
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*/
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void GetLastDocShell(nsIDocShellTreeItem* aItem,
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nsIDocShellTreeItem** aResult);
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/**
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* Get the next docshell child of aItem and return it in aResult.
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*/
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void GetNextDocShell(nsIDocShellTreeItem* aItem,
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nsIDocShellTreeItem** aResult);
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/**
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* Get the previous docshell child of aItem and return it in aResult.
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*/
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void GetPreviousDocShell(nsIDocShellTreeItem* aItem,
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nsIDocShellTreeItem** aResult);
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/**
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* Get the tabbable next document from the currently focused frame if
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* aForward is true, or the previously tabbable document if aForward is
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* false. If this document is a chrome or frameset document, returns
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* the first focusable element within this document, otherwise, returns
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* the root node of the document.
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*
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* This method would be used for document navigation, which is typically
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* invoked by pressing F6.
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*/
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nsIContent* GetNextTabbableDocument(PRBool aForward);
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/**
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* Retreives a focusable element within the current selection of aWindow.
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* Currently, this only detects links.
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*
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* This is used when MoveFocus is called with a type of MOVEFOCUS_CARET,
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* which is used, for example, to focus links as the caret is moved over
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* them.
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*/
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void GetFocusInSelection(nsPIDOMWindow* aWindow,
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nsIContent* aStartSelection,
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nsIContent* aEndSelection,
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nsIContent** aFocusedContent);
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// the currently active and front-most top-most window
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nsCOMPtr<nsPIDOMWindow> mActiveWindow;
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// the child or top-level window that is currently focused. This window will
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// either be the same window as mActiveWindow or a descendant of it.
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nsCOMPtr<nsPIDOMWindow> mFocusedWindow;
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// the currently focused content, which is always inside mFocusedWindow. This
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// is a cached copy of the mFocusedWindow's current content. This may be null
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// if no content is focused.
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nsCOMPtr<nsIContent> mFocusedContent;
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// these fields store a content node temporarily while it is being focused
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// or blurred to ensure that a recursive call doesn't refire the same event.
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// They will always be cleared afterwards.
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nsCOMPtr<nsIContent> mFirstBlurEvent;
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nsCOMPtr<nsIContent> mFirstFocusEvent;
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// keep track of a window while it is being lowered
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nsCOMPtr<nsPIDOMWindow> mWindowBeingLowered;
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// synchronized actions cannot be interrupted with events, so queue these up
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// and fire them later.
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nsTArray<nsDelayedBlurOrFocusEvent> mDelayedBlurFocusEvents;
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// the single focus manager
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static nsFocusManager* sInstance;
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};
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nsresult
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NS_NewFocusManager(nsIFocusManager** aResult);
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#endif
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