554 lines
20 KiB
C++
554 lines
20 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsFocusManager_h___
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#define nsFocusManager_h___
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#include "nsCycleCollectionParticipant.h"
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#include "nsIContent.h"
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#include "nsIDocument.h"
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#include "nsIFocusManager.h"
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#include "nsIObserver.h"
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#include "nsIWidget.h"
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#include "nsWeakReference.h"
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#include "mozilla/Attributes.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 nsIContent;
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class nsIDocShellTreeItem;
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class nsPIDOMWindow;
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class nsIMessageBroadcaster;
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namespace mozilla {
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namespace dom {
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class TabParent;
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}
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}
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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 final : public nsIFocusManager,
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public nsIObserver,
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public nsSupportsWeakReference
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{
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typedef mozilla::widget::InputContextAction InputContextAction;
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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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* Return a focused window. Version of nsIFocusManager::GetFocusedWindow.
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*/
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nsPIDOMWindow* GetFocusedWindow() const { return mFocusedWindow; }
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/**
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* Return an active window. Version of nsIFocusManager::GetActiveWindow.
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*/
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nsPIDOMWindow* GetActiveWindow() const { return mActiveWindow; }
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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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* Called when mouse button event handling is started and finished.
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*/
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already_AddRefed<nsIDocument>
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SetMouseButtonHandlingDocument(nsIDocument* aDocument)
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{
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nsCOMPtr<nsIDocument> handlingDocument = mMouseButtonEventHandlingDocument;
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mMouseButtonEventHandlingDocument = aDocument;
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return handlingDocument.forget();
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}
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void NeedsFlushBeforeEventHandling(nsIContent* aContent)
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{
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if (mFocusedContent == aContent) {
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mEventHandlingNeedsFlush = true;
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}
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}
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bool CanSkipFocus(nsIContent* aContent)
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{
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return mFocusedContent == aContent;
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}
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void FlushBeforeEventHandlingIfNeeded(nsIContent* aContent)
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{
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if (mEventHandlingNeedsFlush) {
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nsCOMPtr<nsIDocument> doc = aContent->GetComposedDoc();
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if (doc) {
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mEventHandlingNeedsFlush = false;
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doc->FlushPendingNotifications(Flush_Layout);
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}
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}
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}
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/**
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* Update the caret with current mode (whether in caret browsing mode or not).
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*/
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void UpdateCaretForCaretBrowsingMode();
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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, bool 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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/**
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* Returns an InputContextAction cause for aFlags.
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*/
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static InputContextAction::Cause GetFocusMoveActionCause(uint32_t aFlags);
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static bool sMouseFocusesFormControl;
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static void MarkUncollectableForCCGeneration(uint32_t aGeneration);
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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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* Iterate over the children of the message broadcaster and notify them
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* of the activation change.
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*/
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void ActivateOrDeactivateChildren(nsIMessageBroadcaster* aManager, bool aActive);
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/**
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* Activate or deactivate the window and send the activate/deactivate events.
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*/
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void ActivateOrDeactivate(nsPIDOMWindow* aWindow, bool aActive);
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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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* If aAdjustWidget is false, don't change the widget focus state.
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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, int32_t aFlags,
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bool aFocusChanged, bool aAdjustWidget);
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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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bool 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, bool aCheckPermission);
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/**
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* Returns true if aWindow is visible.
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*/
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bool 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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bool 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, uint32_t 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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* If aAdjustWidget is false, don't change the widget focus state.
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*/
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bool Blur(nsPIDOMWindow* aWindowToClear,
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nsPIDOMWindow* aAncestorWindowToFocus,
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bool aIsLeavingDocument,
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bool aAdjustWidget);
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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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* If aAdjustWidget is false, don't change the widget focus state.
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*/
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void Focus(nsPIDOMWindow* aWindow,
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nsIContent* aContent,
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uint32_t aFlags,
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bool aIsNewDocument,
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bool aFocusChanged,
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bool aWindowRaised,
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bool aAdjustWidget);
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/**
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* Fires a focus or blur event at aTarget.
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*
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* aEventMessage should be either eFocus or eBlur.
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* For blur 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(mozilla::EventMessage aEventMessage,
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nsIPresShell* aPresShell,
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nsIDocument* aDocument,
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nsISupports* aTarget,
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uint32_t aFocusMethod,
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bool aWindowRaised,
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bool aIsRefocus = false);
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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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uint32_t 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(bool aMoveCaretToFocus,
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bool 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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bool 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. If aNoParentTraversal is set,
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* navigation is not done to parent documents and iteration returns to the
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* beginning (or end) of the starting document.
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*/
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nsresult DetermineElementToMoveFocus(nsPIDOMWindow* aWindow,
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nsIContent* aStart,
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int32_t aType, bool aNoParentTraversal,
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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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bool aForward,
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int32_t aCurrentTabIndex,
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bool aIgnoreTabIndex,
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bool aForDocumentNavigation,
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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(bool aForward,
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int32_t 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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int32_t GetNextTabIndex(nsIContent* aParent,
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int32_t aCurrentTabIndex,
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bool aForward);
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/**
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* Focus the first focusable content within the document with a root node of
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* aRootContent. For content documents, this will be aRootContent itself, but
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* for chrome documents, this will locate the next focusable content.
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*/
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nsresult FocusFirst(nsIContent* aRootContent, nsIContent** aNextContent);
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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 aForDocumentNavigation 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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bool aForDocumentNavigation,
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bool aCheckVisibility);
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/**
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* Retrieves and returns the root node as with GetRootForFocus but only if
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* aContent is a frame with a valid child document.
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*/
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nsIContent* GetRootForChildDocument(nsIContent* aContent);
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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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private:
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// Notify that the focus state of aContent has changed. Note that
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// we need to pass in whether the window should show a focus ring
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// before the SetFocusedNode call on it happened when losing focus
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// and after the SetFocusedNode call when gaining focus, which is
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// why that information needs to be an explicit argument instead of
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// just passing in the window and asking it whether it should show
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// focus rings: in the losing focus case that information could be
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// wrong..
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static void NotifyFocusStateChange(nsIContent* aContent,
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bool aWindowShouldShowFocusRing,
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bool aGettingFocus);
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void SetFocusedWindowInternal(nsPIDOMWindow* aWindow);
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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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// Except during shutdown use SetFocusedWindowInternal to set mFocusedWindow!
|
|
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 event.
|
|
// When a mouse down event process is finished, ESM sets focus to the target
|
|
// content if it's not consumed. Therefore, while DOM event handlers are
|
|
// handling mouse down events or preceding mosue down event is consumed but
|
|
// handling mouse up events, they should be able to steal focus from any
|
|
// elements even if focus is in chrome content. So, if this isn't nullptr
|
|
// and the caller can access the document node, the caller should succeed in
|
|
// moving focus.
|
|
nsCOMPtr<nsIDocument> mMouseButtonEventHandlingDocument;
|
|
|
|
// If set to true, layout of the document of the event target should be
|
|
// flushed before handling focus depending events.
|
|
bool mEventHandlingNeedsFlush;
|
|
|
|
static bool sTestMode;
|
|
|
|
// the single focus manager
|
|
static nsFocusManager* sInstance;
|
|
};
|
|
|
|
nsresult
|
|
NS_NewFocusManager(nsIFocusManager** aResult);
|
|
|
|
#endif
|