зеркало из https://github.com/mozilla/gecko-dev.git
683 строки
26 KiB
C++
683 строки
26 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 nsPIDOMWindowOuter;
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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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* Returns true if aContent currently has focus.
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*/
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bool IsFocused(nsIContent* aContent);
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/**
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* Return a focused window. Version of nsIFocusManager::GetFocusedWindow.
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*/
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nsPIDOMWindowOuter* 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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nsPIDOMWindowOuter* 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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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(mozilla::FlushType::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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enum SearchRange
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{
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// Return focused content in aWindow. So, aFocusedWindow is always aWindow.
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eOnlyCurrentWindow,
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// Return focused content in aWindow or one of all sub windows.
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eIncludeAllDescendants,
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// Return focused content in aWindow or one of visible sub windows.
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eIncludeVisibleDescendants,
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};
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static nsIContent* GetFocusedDescendant(nsPIDOMWindowOuter* aWindow,
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SearchRange aSearchRange,
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nsPIDOMWindowOuter** 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 or input number 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(nsPIDOMWindowOuter* 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(nsPIDOMWindowOuter* aPossibleAncestor,
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nsPIDOMWindowOuter* 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<nsPIDOMWindowOuter>
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GetCommonAncestor(nsPIDOMWindowOuter* aWindow1, nsPIDOMWindowOuter* 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(nsPIDOMWindowOuter* 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(nsPIDOMWindowOuter* 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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// MOZ_CAN_RUN_SCRIPT_BOUNDARY for now, until we annotate callers.
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MOZ_CAN_RUN_SCRIPT_BOUNDARY
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bool Blur(nsPIDOMWindowOuter* aWindowToClear,
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nsPIDOMWindowOuter* aAncestorWindowToFocus,
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bool aIsLeavingDocument,
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bool aAdjustWidget,
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nsIContent* aContentToFocus = nullptr);
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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(nsPIDOMWindowOuter* 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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nsIContent* aContentLostFocus = nullptr);
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/**
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* Send a focus or blur event at aTarget. It may be added to the delayed
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* event queue if the document is suppressing events.
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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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mozilla::dom::EventTarget* aRelatedTarget = nullptr);
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/**
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* Fire 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 FireFocusOrBlurEvent(mozilla::EventMessage aEventMessage,
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nsIPresShell* aPresShell,
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nsISupports* aTarget,
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bool aWindowRaised,
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bool aIsRefocus = false,
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mozilla::dom::EventTarget* aRelatedTarget = nullptr);
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/**
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* Fire a focusin or focusout event
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*
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* aEventMessage should be either eFocusIn or eFocusOut.
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*
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* aTarget is the content the event will fire on (the object that gained
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* focus for focusin, the object blurred for focusout).
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*
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* aCurrentFocusedWindow is the window focused before the focus/blur event
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* was fired.
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*
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* aCurrentFocusedContent is the content focused before the focus/blur event
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* was fired.
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*
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* aRelatedTarget is the content related to the event (the object
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* losing focus for focusin, the object getting focus for focusout).
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*/
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void FireFocusInOrOutEvent(mozilla::EventMessage aEventMessage,
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nsIPresShell* aPresShell,
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nsISupports* aTarget,
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nsPIDOMWindowOuter* aCurrentFocusedWindow,
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nsIContent* aCurrentFocusedContent,
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mozilla::dom::EventTarget* aRelatedTarget = nullptr);
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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(nsPIDOMWindowOuter* 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(nsPIDOMWindowOuter* 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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* Returns scope owner of aContent.
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* A scope owner is either a document root, shadow host, or slot.
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*/
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nsIContent* FindOwner(nsIContent* aContent);
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/**
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* Returns true if aContent is a shadow host or slot
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*/
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bool IsHostOrSlot(nsIContent* aContent);
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/**
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* Retrieve the next tabbable element in scope owned by aOwner, using
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* focusability and tabindex to determine the tab order.
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*
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* aOwner is the owner of scope to search in.
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*
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* aStartContent is the starting point for this call of this method.
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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.
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*
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* aSkipOwner to skip owner while searching. The flag is set when caller is
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* |GetNextTabbableContent| in order to let caller handle owner.
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*
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* NOTE:
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* Consider the method searches downwards in flattened subtree
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* rooted at aOwner.
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*/
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nsIContent* GetNextTabbableContentInScope(nsIContent* aOwner,
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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 aSkipOwner);
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/**
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* Retrieve the next tabbable element in scope including aStartContent
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* and the scope's ancestor scopes, using focusability and tabindex to
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* determine the tab order.
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*
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* aStartContent an in/out paremeter. It as input is the starting point
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* for this call of this method; as output it is the shadow host in
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* light DOM if the next tabbable element is not found in shadow DOM,
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* in order to continue searching in light DOM.
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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 returns tab index of shadow host in light DOM if the
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* next tabbable element is not found in shadow DOM, in order to continue
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* searching in light DOM.
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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.
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*
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* NOTE:
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* Consider the method searches upwards in all shadow host- or slot-rooted
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* flattened subtrees that contains aStartContent as non-root, except
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* the flattened subtree rooted at shadow host in light DOM.
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*/
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nsIContent* GetNextTabbableContentInAncestorScopes(nsIContent** aStartContent,
|
|
bool aForward,
|
|
int32_t* aCurrentTabIndex,
|
|
bool aIgnoreTabIndex);
|
|
|
|
/**
|
|
* 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,
|
|
bool aForward,
|
|
int32_t aCurrentTabIndex,
|
|
bool aIgnoreTabIndex,
|
|
bool aForDocumentNavigation,
|
|
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(bool aForward,
|
|
int32_t aCurrentTabIndex,
|
|
mozilla::dom::Element* 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.
|
|
*/
|
|
int32_t GetNextTabIndex(nsIContent* aParent,
|
|
int32_t aCurrentTabIndex,
|
|
bool aForward);
|
|
|
|
/**
|
|
* Focus the first focusable content within the document with a root node of
|
|
* aRootContent. For content documents, this will be aRootContent itself, but
|
|
* for chrome documents, this will locate the next focusable content.
|
|
*/
|
|
nsresult FocusFirst(mozilla::dom::Element* aRootContent, nsIContent** aNextContent);
|
|
|
|
/**
|
|
* 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 aForDocumentNavigation is false and aWindow is a chrome shell.
|
|
* - if aCheckVisibility is true and the aWindow is not visible.
|
|
* - if aDocument is a frameset document.
|
|
*/
|
|
mozilla::dom::Element* GetRootForFocus(nsPIDOMWindowOuter* aWindow,
|
|
nsIDocument* aDocument,
|
|
bool aForDocumentNavigation,
|
|
bool aCheckVisibility);
|
|
|
|
/**
|
|
* Retrieves and returns the root node as with GetRootForFocus but only if
|
|
* aContent is a frame with a valid child document.
|
|
*/
|
|
mozilla::dom::Element* GetRootForChildDocument(nsIContent* aContent);
|
|
|
|
/**
|
|
* 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(nsPIDOMWindowOuter* aWindow,
|
|
nsIContent* aStartSelection,
|
|
nsIContent* aEndSelection,
|
|
nsIContent** aFocusedContent);
|
|
|
|
private:
|
|
// Notify that the focus state of aContent has changed. Note that
|
|
// we need to pass in whether the window should show a focus ring
|
|
// before the SetFocusedNode call on it happened when losing focus
|
|
// and after the SetFocusedNode call when gaining focus, which is
|
|
// why that information needs to be an explicit argument instead of
|
|
// just passing in the window and asking it whether it should show
|
|
// focus rings: in the losing focus case that information could be
|
|
// wrong..
|
|
static void NotifyFocusStateChange(nsIContent* aContent,
|
|
nsIContent* aContentToFocus,
|
|
bool aWindowShouldShowFocusRing,
|
|
bool aGettingFocus);
|
|
|
|
void SetFocusedWindowInternal(nsPIDOMWindowOuter* aWindow);
|
|
|
|
// the currently active and front-most top-most window
|
|
nsCOMPtr<nsPIDOMWindowOuter> 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.
|
|
// Except during shutdown use SetFocusedWindowInternal to set mFocusedWindow!
|
|
nsCOMPtr<nsPIDOMWindowOuter> 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<nsPIDOMWindowOuter> 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
|