gecko-dev/layout/printing/nsPrintPreviewListener.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Mozilla browser.
*
* The Initial Developer of the Original Code is
* Netscape Communications, Inc.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Mats Palmgren <mats.palmgren@bredband.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsPrintPreviewListener.h"
#include "nsIContent.h"
#include "nsIDOMKeyEvent.h"
#include "nsIDOMNSEvent.h"
#include "nsIDocument.h"
#include "nsIPresShell.h"
#include "nsIDocShell.h"
#include "nsPresContext.h"
#include "nsIEventStateManager.h"
#include "nsLiteralString.h"
NS_IMPL_ISUPPORTS1(nsPrintPreviewListener, nsIDOMEventListener)
//
// nsPrintPreviewListener ctor
//
nsPrintPreviewListener::nsPrintPreviewListener (nsIDOMEventTarget* aTarget)
: mEventTarget(aTarget)
{
NS_ADDREF_THIS();
} // ctor
//-------------------------------------------------------
//
// AddListeners
//
// Subscribe to the events that will allow us to track various events.
//
nsresult
nsPrintPreviewListener::AddListeners()
{
if (mEventTarget) {
mEventTarget->AddEventListener(NS_LITERAL_STRING("click"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("contextmenu"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("keydown"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("keypress"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("keyup"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("mousedown"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("mousemove"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("mouseout"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("mouseover"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("mouseup"), this, true);
}
return NS_OK;
}
//-------------------------------------------------------
//
// RemoveListeners
//
// Unsubscribe from all the various events that we were listening to.
//
nsresult
nsPrintPreviewListener::RemoveListeners()
{
if (mEventTarget) {
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("click"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("contextmenu"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("keydown"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("keypress"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("keyup"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mousedown"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mousemove"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mouseout"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mouseover"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mouseup"), this, true);
}
return NS_OK;
}
//-------------------------------------------------------
//
// GetActionForEvent
//
// Helper function to let certain key events through
//
enum eEventAction {
eEventAction_Tab, eEventAction_ShiftTab,
eEventAction_Propagate, eEventAction_Suppress
};
static eEventAction
GetActionForEvent(nsIDOMEvent* aEvent)
{
static const PRUint32 kOKKeyCodes[] = {
nsIDOMKeyEvent::DOM_VK_PAGE_UP, nsIDOMKeyEvent::DOM_VK_PAGE_DOWN,
nsIDOMKeyEvent::DOM_VK_UP, nsIDOMKeyEvent::DOM_VK_DOWN,
nsIDOMKeyEvent::DOM_VK_HOME, nsIDOMKeyEvent::DOM_VK_END
};
nsCOMPtr<nsIDOMKeyEvent> keyEvent(do_QueryInterface(aEvent));
if (keyEvent) {
PRBool b;
keyEvent->GetAltKey(&b);
if (b) return eEventAction_Suppress;
keyEvent->GetCtrlKey(&b);
if (b) return eEventAction_Suppress;
keyEvent->GetShiftKey(&b);
PRUint32 keyCode;
keyEvent->GetKeyCode(&keyCode);
if (keyCode == nsIDOMKeyEvent::DOM_VK_TAB)
return b ? eEventAction_ShiftTab : eEventAction_Tab;
PRUint32 charCode;
keyEvent->GetCharCode(&charCode);
if (charCode == ' ' || keyCode == nsIDOMKeyEvent::DOM_VK_SPACE)
return eEventAction_Propagate;
if (b) return eEventAction_Suppress;
for (PRUint32 i = 0; i < sizeof(kOKKeyCodes)/sizeof(kOKKeyCodes[0]); ++i) {
if (keyCode == kOKKeyCodes[i]) {
return eEventAction_Propagate;
}
}
}
return eEventAction_Suppress;
}
NS_IMETHODIMP
nsPrintPreviewListener::HandleEvent(nsIDOMEvent* aEvent)
{
nsCOMPtr<nsIDOMEventTarget> target;
nsCOMPtr<nsIDOMNSEvent> nsEvent = do_QueryInterface(aEvent);
if (nsEvent)
nsEvent->GetOriginalTarget(getter_AddRefs(target));
nsCOMPtr<nsIContent> content(do_QueryInterface(target));
if (content && !content->IsNodeOfType(nsINode::eXUL)) {
eEventAction action = ::GetActionForEvent(aEvent);
switch (action) {
case eEventAction_Tab:
case eEventAction_ShiftTab:
{
nsAutoString eventString;
aEvent->GetType(eventString);
if (eventString == NS_LITERAL_STRING("keydown")) {
// Handle tabbing explicitly here since we don't want focus ending up
// inside the content document, bug 244128.
nsIDocument* doc = content->GetCurrentDoc();
NS_ASSERTION(doc, "no document");
nsIDocument* parentDoc = doc->GetParentDocument();
NS_ASSERTION(parentDoc, "no parent document");
nsIEventStateManager* esm =
parentDoc->GetShellAt(0)->GetPresContext()->EventStateManager();
if (esm) {
esm->SetContentState(nsnull, NS_EVENT_STATE_FOCUS);
PRBool forward = (action == eEventAction_Tab);
esm->ShiftFocus(forward,
forward ? nsnull : parentDoc->FindContentForSubDocument(doc));
}
}
}
// fall-through
case eEventAction_Suppress:
aEvent->StopPropagation();
aEvent->PreventDefault();
break;
case eEventAction_Propagate:
// intentionally empty
break;
}
}
return NS_OK;
}