mirror of
https://github.com/rn10950/RetroZilla.git
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212 lines
7.4 KiB
C++
212 lines
7.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Mozilla browser.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications, Inc.
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* Portions created by the Initial Developer are Copyright (C) 1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Mats Palmgren <mats.palmgren@bredband.net>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsPrintPreviewListener.h"
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#include "nsIContent.h"
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#include "nsIDOMKeyEvent.h"
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#include "nsIDOMNSEvent.h"
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#include "nsIDocument.h"
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#include "nsIPresShell.h"
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#include "nsIDocShell.h"
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#include "nsPresContext.h"
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#include "nsIEventStateManager.h"
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#include "nsLiteralString.h"
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NS_IMPL_ISUPPORTS1(nsPrintPreviewListener, nsIDOMEventListener)
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//
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// nsPrintPreviewListener ctor
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//
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nsPrintPreviewListener::nsPrintPreviewListener (nsIDOMEventTarget* 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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//-------------------------------------------------------
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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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}
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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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}
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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 thru
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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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};
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static eEventAction
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GetActionForEvent(nsIDOMEvent* aEvent)
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{
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static const PRUint32 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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nsCOMPtr<nsIDOMKeyEvent> keyEvent(do_QueryInterface(aEvent));
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if (keyEvent) {
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PRBool b;
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keyEvent->GetAltKey(&b);
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if (b) return eEventAction_Suppress;
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keyEvent->GetCtrlKey(&b);
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if (b) return eEventAction_Suppress;
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keyEvent->GetShiftKey(&b);
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PRUint32 keyCode;
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keyEvent->GetKeyCode(&keyCode);
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if (keyCode == nsIDOMKeyEvent::DOM_VK_TAB)
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return b ? eEventAction_ShiftTab : eEventAction_Tab;
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PRUint32 charCode;
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keyEvent->GetCharCode(&charCode);
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if (charCode == ' ' || keyCode == nsIDOMKeyEvent::DOM_VK_SPACE)
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return eEventAction_Propagate;
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if (b) return eEventAction_Suppress;
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for (PRUint32 i = 0; i < sizeof(kOKKeyCodes)/sizeof(kOKKeyCodes[0]); ++i) {
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if (keyCode == kOKKeyCodes[i]) {
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return eEventAction_Propagate;
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}
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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<nsIDOMEventTarget> target;
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nsCOMPtr<nsIDOMNSEvent> nsEvent = do_QueryInterface(aEvent);
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if (nsEvent)
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nsEvent->GetOriginalTarget(getter_AddRefs(target));
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nsCOMPtr<nsIContent> content(do_QueryInterface(target));
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if (content && !content->IsContentOfType(nsIContent::eXUL)) {
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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 == NS_LITERAL_STRING("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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nsIEventStateManager* esm =
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parentDoc->GetShellAt(0)->GetPresContext()->EventStateManager();
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if (esm) {
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esm->SetContentState(nsnull, NS_EVENT_STATE_FOCUS);
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PRBool forward = (action == eEventAction_Tab);
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esm->ShiftFocus(forward,
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forward ? nsnull : parentDoc->FindContentForSubDocument(doc));
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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_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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