mirror of
https://github.com/classilla/tenfourfox.git
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213 lines
7.0 KiB
C++
213 lines
7.0 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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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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#include "nsPrintPreviewListener.h"
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#include "mozilla/TextEvents.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/dom/Event.h" // for nsIDOMEvent::InternalDOMEvent()
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#include "nsIDOMWindow.h"
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#include "nsPIDOMWindow.h"
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#include "nsIDOMElement.h"
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#include "nsIDOMKeyEvent.h"
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#include "nsIDOMEvent.h"
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#include "nsIDocument.h"
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#include "nsIDocShell.h"
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#include "nsPresContext.h"
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#include "nsFocusManager.h"
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#include "nsLiteralString.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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NS_IMPL_ISUPPORTS(nsPrintPreviewListener, nsIDOMEventListener)
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//
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// nsPrintPreviewListener ctor
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//
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nsPrintPreviewListener::nsPrintPreviewListener(EventTarget* aTarget)
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: mEventTarget(aTarget)
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{
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NS_ADDREF_THIS();
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} // ctor
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nsPrintPreviewListener::~nsPrintPreviewListener()
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{
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}
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//-------------------------------------------------------
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//
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// AddListeners
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//
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// Subscribe to the events that will allow us to track various events.
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//
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nsresult
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nsPrintPreviewListener::AddListeners()
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{
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if (mEventTarget) {
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mEventTarget->AddEventListener(NS_LITERAL_STRING("click"), this, true);
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mEventTarget->AddEventListener(NS_LITERAL_STRING("contextmenu"), this, true);
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mEventTarget->AddEventListener(NS_LITERAL_STRING("keydown"), this, true);
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mEventTarget->AddEventListener(NS_LITERAL_STRING("keypress"), this, true);
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mEventTarget->AddEventListener(NS_LITERAL_STRING("keyup"), this, true);
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mEventTarget->AddEventListener(NS_LITERAL_STRING("mousedown"), this, true);
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mEventTarget->AddEventListener(NS_LITERAL_STRING("mousemove"), this, true);
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mEventTarget->AddEventListener(NS_LITERAL_STRING("mouseout"), this, true);
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mEventTarget->AddEventListener(NS_LITERAL_STRING("mouseover"), this, true);
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mEventTarget->AddEventListener(NS_LITERAL_STRING("mouseup"), this, true);
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mEventTarget->AddSystemEventListener(NS_LITERAL_STRING("keydown"),
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this, true);
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}
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return NS_OK;
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}
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//-------------------------------------------------------
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//
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// RemoveListeners
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//
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// Unsubscribe from all the various events that we were listening to.
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//
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nsresult
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nsPrintPreviewListener::RemoveListeners()
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{
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if (mEventTarget) {
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mEventTarget->RemoveEventListener(NS_LITERAL_STRING("click"), this, true);
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mEventTarget->RemoveEventListener(NS_LITERAL_STRING("contextmenu"), this, true);
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mEventTarget->RemoveEventListener(NS_LITERAL_STRING("keydown"), this, true);
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mEventTarget->RemoveEventListener(NS_LITERAL_STRING("keypress"), this, true);
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mEventTarget->RemoveEventListener(NS_LITERAL_STRING("keyup"), this, true);
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mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mousedown"), this, true);
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mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mousemove"), this, true);
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mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mouseout"), this, true);
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mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mouseover"), this, true);
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mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mouseup"), this, true);
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mEventTarget->RemoveSystemEventListener(NS_LITERAL_STRING("keydown"),
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this, true);
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}
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return NS_OK;
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}
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//-------------------------------------------------------
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//
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// GetActionForEvent
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//
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// Helper function to let certain key events through
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//
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enum eEventAction {
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eEventAction_Tab, eEventAction_ShiftTab,
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eEventAction_Propagate, eEventAction_Suppress,
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eEventAction_StopPropagation
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};
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static eEventAction
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GetActionForEvent(nsIDOMEvent* aEvent)
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{
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WidgetKeyboardEvent* keyEvent =
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aEvent->GetInternalNSEvent()->AsKeyboardEvent();
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if (!keyEvent) {
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return eEventAction_Suppress;
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}
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if (keyEvent->mFlags.mInSystemGroup) {
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NS_ASSERTION(keyEvent->mMessage == eKeyDown,
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"Assuming we're listening only keydown event in system group");
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return eEventAction_StopPropagation;
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}
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if (keyEvent->IsAlt() || keyEvent->IsControl() || keyEvent->IsMeta()) {
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// Don't consume keydown event because following keypress event may be
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// handled as access key or shortcut key.
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return (keyEvent->mMessage == eKeyDown) ? eEventAction_StopPropagation :
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eEventAction_Suppress;
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}
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static const uint32_t kOKKeyCodes[] = {
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nsIDOMKeyEvent::DOM_VK_PAGE_UP, nsIDOMKeyEvent::DOM_VK_PAGE_DOWN,
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nsIDOMKeyEvent::DOM_VK_UP, nsIDOMKeyEvent::DOM_VK_DOWN,
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nsIDOMKeyEvent::DOM_VK_HOME, nsIDOMKeyEvent::DOM_VK_END
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};
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if (keyEvent->keyCode == nsIDOMKeyEvent::DOM_VK_TAB) {
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return keyEvent->IsShift() ? eEventAction_ShiftTab : eEventAction_Tab;
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}
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if (keyEvent->charCode == ' ' || keyEvent->keyCode == NS_VK_SPACE) {
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return eEventAction_Propagate;
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}
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if (keyEvent->IsShift()) {
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return eEventAction_Suppress;
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}
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for (uint32_t i = 0; i < ArrayLength(kOKKeyCodes); ++i) {
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if (keyEvent->keyCode == kOKKeyCodes[i]) {
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return eEventAction_Propagate;
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}
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}
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return eEventAction_Suppress;
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}
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NS_IMETHODIMP
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nsPrintPreviewListener::HandleEvent(nsIDOMEvent* aEvent)
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{
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nsCOMPtr<nsIContent> content = do_QueryInterface(
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aEvent ? aEvent->InternalDOMEvent()->GetOriginalTarget() : nullptr);
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if (content && !content->IsXULElement()) {
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eEventAction action = ::GetActionForEvent(aEvent);
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switch (action) {
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case eEventAction_Tab:
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case eEventAction_ShiftTab:
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{
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nsAutoString eventString;
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aEvent->GetType(eventString);
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if (eventString.EqualsLiteral("keydown")) {
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// Handle tabbing explicitly here since we don't want focus ending up
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// inside the content document, bug 244128.
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nsIDocument* doc = content->GetCurrentDoc();
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NS_ASSERTION(doc, "no document");
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nsIDocument* parentDoc = doc->GetParentDocument();
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NS_ASSERTION(parentDoc, "no parent document");
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nsCOMPtr<nsIDOMWindow> win = do_QueryInterface(parentDoc->GetWindow());
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nsIFocusManager* fm = nsFocusManager::GetFocusManager();
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if (fm && win) {
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dom::Element* fromElement = parentDoc->FindContentForSubDocument(doc);
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nsCOMPtr<nsIDOMElement> from = do_QueryInterface(fromElement);
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bool forward = (action == eEventAction_Tab);
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nsCOMPtr<nsIDOMElement> result;
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fm->MoveFocus(win, from,
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forward ? nsIFocusManager::MOVEFOCUS_FORWARD :
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nsIFocusManager::MOVEFOCUS_BACKWARD,
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nsIFocusManager::FLAG_BYKEY, getter_AddRefs(result));
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}
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}
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}
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// fall-through
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case eEventAction_Suppress:
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aEvent->StopPropagation();
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aEvent->PreventDefault();
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break;
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case eEventAction_StopPropagation:
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aEvent->StopPropagation();
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break;
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case eEventAction_Propagate:
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// intentionally empty
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break;
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}
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}
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return NS_OK;
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}
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