2002-03-23 21:07:51 +03:00
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape
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* Communications, Inc. Portions created by Netscape are
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* Copyright (C) 1999, Mozilla. All Rights Reserved.
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*
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* Contributor(s):
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*
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*/
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#include "nsPrintPreviewListener.h"
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#include "nsIDOMKeyEvent.h"
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NS_IMPL_ADDREF(nsPrintPreviewListener)
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NS_IMPL_RELEASE(nsPrintPreviewListener)
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NS_INTERFACE_MAP_BEGIN(nsPrintPreviewListener)
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NS_INTERFACE_MAP_ENTRY(nsIDOMContextMenuListener)
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NS_INTERFACE_MAP_ENTRY(nsIDOMKeyListener)
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NS_INTERFACE_MAP_ENTRY(nsIDOMMouseListener)
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NS_INTERFACE_MAP_ENTRY(nsIDOMMouseMotionListener)
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NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsIDOMEventListener, nsIDOMContextMenuListener)
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NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMContextMenuListener)
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NS_INTERFACE_MAP_END
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//
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// nsPrintPreviewListener ctor
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//
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nsPrintPreviewListener::nsPrintPreviewListener (nsIDOMEventReceiver* aEVRec)
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: mEventReceiver(aEVRec),
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mRegFlags(REG_NONE_LISTENER)
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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 (mRegFlags != REG_NONE_LISTENER) return NS_ERROR_FAILURE;
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if (mEventReceiver) {
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nsIDOMContextMenuListener *pListener = NS_STATIC_CAST(nsIDOMContextMenuListener *, this);
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NS_ASSERTION(pListener, "Cast can't fail!");
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nsresult rv = mEventReceiver->AddEventListenerByIID(pListener, NS_GET_IID(nsIDOMContextMenuListener));
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NS_ENSURE_SUCCESS(rv, rv);
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mRegFlags |= REG_CONTEXTMENU_LISTENER;
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rv = mEventReceiver->AddEventListenerByIID(pListener, NS_GET_IID(nsIDOMKeyListener));
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NS_ENSURE_SUCCESS(rv, rv);
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mRegFlags |= REG_KEY_LISTENER;
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rv = mEventReceiver->AddEventListenerByIID(pListener, NS_GET_IID(nsIDOMMouseListener));
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NS_ENSURE_SUCCESS(rv, rv);
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mRegFlags |= REG_MOUSE_LISTENER;
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rv = mEventReceiver->AddEventListenerByIID(pListener, NS_GET_IID(nsIDOMMouseMotionListener));
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NS_ENSURE_SUCCESS(rv, rv);
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mRegFlags |= REG_MOUSEMOTION_LISTENER;
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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 (mEventReceiver && mRegFlags != REG_NONE_LISTENER) {
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nsIDOMContextMenuListener *pListener = NS_STATIC_CAST(nsIDOMContextMenuListener *, this);
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NS_ASSERTION(pListener, "Cast can't fail!");
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// ignore return values, so we can try to unregister the other listeners
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if (mRegFlags & REG_CONTEXTMENU_LISTENER) {
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mEventReceiver->RemoveEventListenerByIID(pListener, NS_GET_IID(nsIDOMContextMenuListener));
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}
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if (mRegFlags & REG_KEY_LISTENER) {
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mEventReceiver->RemoveEventListenerByIID(pListener, NS_GET_IID(nsIDOMKeyListener));
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}
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if (mRegFlags & REG_MOUSE_LISTENER) {
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mEventReceiver->RemoveEventListenerByIID(pListener, NS_GET_IID(nsIDOMMouseListener));
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}
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if (mRegFlags & REG_MOUSEMOTION_LISTENER) {
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mEventReceiver->RemoveEventListenerByIID(pListener, NS_GET_IID(nsIDOMMouseMotionListener));
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}
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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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// IsKeyOK
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//
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// Helper function to let certain key events thru
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//
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static PRBool IsKeyOK(nsIDOMEvent* aEvent)
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{
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const PRUint32 kOKKeyCodes[] = {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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2002-05-23 14:48:37 +04:00
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nsIDOMKeyEvent::DOM_VK_HOME, nsIDOMKeyEvent::DOM_VK_END,
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nsIDOMKeyEvent::DOM_VK_TAB, 0};
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2002-03-23 21:07:51 +03:00
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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 PR_FALSE;
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keyEvent->GetCtrlKey(&b);
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if (b) return PR_FALSE;
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keyEvent->GetShiftKey(&b);
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if (b) return PR_FALSE;
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PRUint32 keyCode;
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keyEvent->GetKeyCode(&keyCode);
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PRInt32 i = 0;
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while (kOKKeyCodes[i] != 0) {
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if (keyCode == kOKKeyCodes[i]) {
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return PR_TRUE;
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}
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i++;
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}
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}
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return PR_FALSE;
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}
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//-------------------------------------------------------
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//
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// KeyDown
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//
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NS_IMETHODIMP nsPrintPreviewListener::KeyDown(nsIDOMEvent* aKeyEvent)
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{
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if (!IsKeyOK(aKeyEvent)) {
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aKeyEvent->PreventDefault();
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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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// KeyUp
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//
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NS_IMETHODIMP nsPrintPreviewListener::KeyUp(nsIDOMEvent* aKeyEvent)
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{
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if (!IsKeyOK(aKeyEvent)) {
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aKeyEvent->PreventDefault();
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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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// KeyPress
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//
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NS_IMETHODIMP nsPrintPreviewListener::KeyPress(nsIDOMEvent* aKeyEvent)
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{
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if (!IsKeyOK(aKeyEvent)) {
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aKeyEvent->PreventDefault();
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}
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return NS_OK;
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}
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