1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/printing/nsPrintPreviewListener.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,212 @@
1.4 +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + *
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "nsPrintPreviewListener.h"
1.11 +
1.12 +#include "mozilla/TextEvents.h"
1.13 +#include "mozilla/dom/Element.h"
1.14 +#include "mozilla/dom/Event.h" // for nsIDOMEvent::InternalDOMEvent()
1.15 +#include "nsIDOMWindow.h"
1.16 +#include "nsPIDOMWindow.h"
1.17 +#include "nsIDOMElement.h"
1.18 +#include "nsIDOMKeyEvent.h"
1.19 +#include "nsIDOMEvent.h"
1.20 +#include "nsIDocument.h"
1.21 +#include "nsIDocShell.h"
1.22 +#include "nsPresContext.h"
1.23 +#include "nsFocusManager.h"
1.24 +#include "nsLiteralString.h"
1.25 +
1.26 +using namespace mozilla;
1.27 +using namespace mozilla::dom;
1.28 +
1.29 +NS_IMPL_ISUPPORTS(nsPrintPreviewListener, nsIDOMEventListener)
1.30 +
1.31 +
1.32 +//
1.33 +// nsPrintPreviewListener ctor
1.34 +//
1.35 +nsPrintPreviewListener::nsPrintPreviewListener(EventTarget* aTarget)
1.36 + : mEventTarget(aTarget)
1.37 +{
1.38 + NS_ADDREF_THIS();
1.39 +} // ctor
1.40 +
1.41 +nsPrintPreviewListener::~nsPrintPreviewListener()
1.42 +{
1.43 +}
1.44 +
1.45 +//-------------------------------------------------------
1.46 +//
1.47 +// AddListeners
1.48 +//
1.49 +// Subscribe to the events that will allow us to track various events.
1.50 +//
1.51 +nsresult
1.52 +nsPrintPreviewListener::AddListeners()
1.53 +{
1.54 + if (mEventTarget) {
1.55 + mEventTarget->AddEventListener(NS_LITERAL_STRING("click"), this, true);
1.56 + mEventTarget->AddEventListener(NS_LITERAL_STRING("contextmenu"), this, true);
1.57 + mEventTarget->AddEventListener(NS_LITERAL_STRING("keydown"), this, true);
1.58 + mEventTarget->AddEventListener(NS_LITERAL_STRING("keypress"), this, true);
1.59 + mEventTarget->AddEventListener(NS_LITERAL_STRING("keyup"), this, true);
1.60 + mEventTarget->AddEventListener(NS_LITERAL_STRING("mousedown"), this, true);
1.61 + mEventTarget->AddEventListener(NS_LITERAL_STRING("mousemove"), this, true);
1.62 + mEventTarget->AddEventListener(NS_LITERAL_STRING("mouseout"), this, true);
1.63 + mEventTarget->AddEventListener(NS_LITERAL_STRING("mouseover"), this, true);
1.64 + mEventTarget->AddEventListener(NS_LITERAL_STRING("mouseup"), this, true);
1.65 +
1.66 + mEventTarget->AddSystemEventListener(NS_LITERAL_STRING("keydown"),
1.67 + this, true);
1.68 + }
1.69 +
1.70 + return NS_OK;
1.71 +}
1.72 +
1.73 +
1.74 +//-------------------------------------------------------
1.75 +//
1.76 +// RemoveListeners
1.77 +//
1.78 +// Unsubscribe from all the various events that we were listening to.
1.79 +//
1.80 +nsresult
1.81 +nsPrintPreviewListener::RemoveListeners()
1.82 +{
1.83 + if (mEventTarget) {
1.84 + mEventTarget->RemoveEventListener(NS_LITERAL_STRING("click"), this, true);
1.85 + mEventTarget->RemoveEventListener(NS_LITERAL_STRING("contextmenu"), this, true);
1.86 + mEventTarget->RemoveEventListener(NS_LITERAL_STRING("keydown"), this, true);
1.87 + mEventTarget->RemoveEventListener(NS_LITERAL_STRING("keypress"), this, true);
1.88 + mEventTarget->RemoveEventListener(NS_LITERAL_STRING("keyup"), this, true);
1.89 + mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mousedown"), this, true);
1.90 + mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mousemove"), this, true);
1.91 + mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mouseout"), this, true);
1.92 + mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mouseover"), this, true);
1.93 + mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mouseup"), this, true);
1.94 +
1.95 + mEventTarget->RemoveSystemEventListener(NS_LITERAL_STRING("keydown"),
1.96 + this, true);
1.97 + }
1.98 +
1.99 + return NS_OK;
1.100 +}
1.101 +
1.102 +//-------------------------------------------------------
1.103 +//
1.104 +// GetActionForEvent
1.105 +//
1.106 +// Helper function to let certain key events through
1.107 +//
1.108 +enum eEventAction {
1.109 + eEventAction_Tab, eEventAction_ShiftTab,
1.110 + eEventAction_Propagate, eEventAction_Suppress,
1.111 + eEventAction_StopPropagation
1.112 +};
1.113 +
1.114 +static eEventAction
1.115 +GetActionForEvent(nsIDOMEvent* aEvent)
1.116 +{
1.117 + WidgetKeyboardEvent* keyEvent =
1.118 + aEvent->GetInternalNSEvent()->AsKeyboardEvent();
1.119 + if (!keyEvent) {
1.120 + return eEventAction_Suppress;
1.121 + }
1.122 +
1.123 + if (keyEvent->mFlags.mInSystemGroup) {
1.124 + NS_ASSERTION(keyEvent->message == NS_KEY_DOWN,
1.125 + "Assuming we're listening only keydown event in system group");
1.126 + return eEventAction_StopPropagation;
1.127 + }
1.128 +
1.129 + if (keyEvent->IsAlt() || keyEvent->IsControl() || keyEvent->IsMeta()) {
1.130 + // Don't consume keydown event because following keypress event may be
1.131 + // handled as access key or shortcut key.
1.132 + return (keyEvent->message == NS_KEY_DOWN) ? eEventAction_StopPropagation :
1.133 + eEventAction_Suppress;
1.134 + }
1.135 +
1.136 + static const uint32_t kOKKeyCodes[] = {
1.137 + nsIDOMKeyEvent::DOM_VK_PAGE_UP, nsIDOMKeyEvent::DOM_VK_PAGE_DOWN,
1.138 + nsIDOMKeyEvent::DOM_VK_UP, nsIDOMKeyEvent::DOM_VK_DOWN,
1.139 + nsIDOMKeyEvent::DOM_VK_HOME, nsIDOMKeyEvent::DOM_VK_END
1.140 + };
1.141 +
1.142 + if (keyEvent->keyCode == nsIDOMKeyEvent::DOM_VK_TAB) {
1.143 + return keyEvent->IsShift() ? eEventAction_ShiftTab : eEventAction_Tab;
1.144 + }
1.145 +
1.146 + if (keyEvent->charCode == ' ' || keyEvent->keyCode == NS_VK_SPACE) {
1.147 + return eEventAction_Propagate;
1.148 + }
1.149 +
1.150 + if (keyEvent->IsShift()) {
1.151 + return eEventAction_Suppress;
1.152 + }
1.153 +
1.154 + for (uint32_t i = 0; i < ArrayLength(kOKKeyCodes); ++i) {
1.155 + if (keyEvent->keyCode == kOKKeyCodes[i]) {
1.156 + return eEventAction_Propagate;
1.157 + }
1.158 + }
1.159 +
1.160 + return eEventAction_Suppress;
1.161 +}
1.162 +
1.163 +NS_IMETHODIMP
1.164 +nsPrintPreviewListener::HandleEvent(nsIDOMEvent* aEvent)
1.165 +{
1.166 + nsCOMPtr<nsIContent> content = do_QueryInterface(
1.167 + aEvent ? aEvent->InternalDOMEvent()->GetOriginalTarget() : nullptr);
1.168 + if (content && !content->IsXUL()) {
1.169 + eEventAction action = ::GetActionForEvent(aEvent);
1.170 + switch (action) {
1.171 + case eEventAction_Tab:
1.172 + case eEventAction_ShiftTab:
1.173 + {
1.174 + nsAutoString eventString;
1.175 + aEvent->GetType(eventString);
1.176 + if (eventString == NS_LITERAL_STRING("keydown")) {
1.177 + // Handle tabbing explicitly here since we don't want focus ending up
1.178 + // inside the content document, bug 244128.
1.179 + nsIDocument* doc = content->GetCurrentDoc();
1.180 + NS_ASSERTION(doc, "no document");
1.181 +
1.182 + nsIDocument* parentDoc = doc->GetParentDocument();
1.183 + NS_ASSERTION(parentDoc, "no parent document");
1.184 +
1.185 + nsCOMPtr<nsIDOMWindow> win = do_QueryInterface(parentDoc->GetWindow());
1.186 +
1.187 + nsIFocusManager* fm = nsFocusManager::GetFocusManager();
1.188 + if (fm && win) {
1.189 + dom::Element* fromElement = parentDoc->FindContentForSubDocument(doc);
1.190 + nsCOMPtr<nsIDOMElement> from = do_QueryInterface(fromElement);
1.191 +
1.192 + bool forward = (action == eEventAction_Tab);
1.193 + nsCOMPtr<nsIDOMElement> result;
1.194 + fm->MoveFocus(win, from,
1.195 + forward ? nsIFocusManager::MOVEFOCUS_FORWARD :
1.196 + nsIFocusManager::MOVEFOCUS_BACKWARD,
1.197 + nsIFocusManager::FLAG_BYKEY, getter_AddRefs(result));
1.198 + }
1.199 + }
1.200 + }
1.201 + // fall-through
1.202 + case eEventAction_Suppress:
1.203 + aEvent->StopPropagation();
1.204 + aEvent->PreventDefault();
1.205 + break;
1.206 + case eEventAction_StopPropagation:
1.207 + aEvent->StopPropagation();
1.208 + break;
1.209 + case eEventAction_Propagate:
1.210 + // intentionally empty
1.211 + break;
1.212 + }
1.213 + }
1.214 + return NS_OK;
1.215 +}
