pjs/layout/printing/nsPrintPreviewListener.cpp

189 строки
5.5 KiB
C++
Исходник Обычный вид История

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* 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 Netscape are
* Copyright (C) 1999, Mozilla. All Rights Reserved.
*
* Contributor(s):
*
*/
#include "nsPrintPreviewListener.h"
#include "nsIDOMKeyEvent.h"
NS_IMPL_ADDREF(nsPrintPreviewListener)
NS_IMPL_RELEASE(nsPrintPreviewListener)
NS_INTERFACE_MAP_BEGIN(nsPrintPreviewListener)
NS_INTERFACE_MAP_ENTRY(nsIDOMContextMenuListener)
NS_INTERFACE_MAP_ENTRY(nsIDOMKeyListener)
NS_INTERFACE_MAP_ENTRY(nsIDOMMouseListener)
NS_INTERFACE_MAP_ENTRY(nsIDOMMouseMotionListener)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsIDOMEventListener, nsIDOMContextMenuListener)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMContextMenuListener)
NS_INTERFACE_MAP_END
//
// nsPrintPreviewListener ctor
//
nsPrintPreviewListener::nsPrintPreviewListener (nsIDOMEventReceiver* aEVRec)
: mEventReceiver(aEVRec),
mRegFlags(REG_NONE_LISTENER)
{
NS_ADDREF_THIS();
} // ctor
//-------------------------------------------------------
//
// AddListeners
//
// Subscribe to the events that will allow us to track various events.
//
nsresult
nsPrintPreviewListener::AddListeners()
{
if (mRegFlags != REG_NONE_LISTENER) return NS_ERROR_FAILURE;
if (mEventReceiver) {
nsIDOMContextMenuListener *pListener = NS_STATIC_CAST(nsIDOMContextMenuListener *, this);
NS_ASSERTION(pListener, "Cast can't fail!");
nsresult rv = mEventReceiver->AddEventListenerByIID(pListener, NS_GET_IID(nsIDOMContextMenuListener));
NS_ENSURE_SUCCESS(rv, rv);
mRegFlags |= REG_CONTEXTMENU_LISTENER;
rv = mEventReceiver->AddEventListenerByIID(pListener, NS_GET_IID(nsIDOMKeyListener));
NS_ENSURE_SUCCESS(rv, rv);
mRegFlags |= REG_KEY_LISTENER;
rv = mEventReceiver->AddEventListenerByIID(pListener, NS_GET_IID(nsIDOMMouseListener));
NS_ENSURE_SUCCESS(rv, rv);
mRegFlags |= REG_MOUSE_LISTENER;
rv = mEventReceiver->AddEventListenerByIID(pListener, NS_GET_IID(nsIDOMMouseMotionListener));
NS_ENSURE_SUCCESS(rv, rv);
mRegFlags |= REG_MOUSEMOTION_LISTENER;
}
return NS_OK;
}
//-------------------------------------------------------
//
// RemoveListeners
//
// Unsubscribe from all the various events that we were listening to.
//
nsresult
nsPrintPreviewListener::RemoveListeners()
{
if (mEventReceiver && mRegFlags != REG_NONE_LISTENER) {
nsIDOMContextMenuListener *pListener = NS_STATIC_CAST(nsIDOMContextMenuListener *, this);
NS_ASSERTION(pListener, "Cast can't fail!");
// ignore return values, so we can try to unregister the other listeners
if (mRegFlags & REG_CONTEXTMENU_LISTENER) {
mEventReceiver->RemoveEventListenerByIID(pListener, NS_GET_IID(nsIDOMContextMenuListener));
}
if (mRegFlags & REG_KEY_LISTENER) {
mEventReceiver->RemoveEventListenerByIID(pListener, NS_GET_IID(nsIDOMKeyListener));
}
if (mRegFlags & REG_MOUSE_LISTENER) {
mEventReceiver->RemoveEventListenerByIID(pListener, NS_GET_IID(nsIDOMMouseListener));
}
if (mRegFlags & REG_MOUSEMOTION_LISTENER) {
mEventReceiver->RemoveEventListenerByIID(pListener, NS_GET_IID(nsIDOMMouseMotionListener));
}
}
return NS_OK;
}
//-------------------------------------------------------
//
// IsKeyOK
//
// Helper function to let certain key events thru
//
static PRBool IsKeyOK(nsIDOMEvent* aEvent)
{
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,
nsIDOMKeyEvent::DOM_VK_TAB, 0};
nsCOMPtr<nsIDOMKeyEvent> keyEvent(do_QueryInterface(aEvent));
if (keyEvent) {
PRBool b;
keyEvent->GetAltKey(&b);
if (b) return PR_FALSE;
keyEvent->GetCtrlKey(&b);
if (b) return PR_FALSE;
keyEvent->GetShiftKey(&b);
if (b) return PR_FALSE;
PRUint32 keyCode;
keyEvent->GetKeyCode(&keyCode);
PRInt32 i = 0;
while (kOKKeyCodes[i] != 0) {
if (keyCode == kOKKeyCodes[i]) {
return PR_TRUE;
}
i++;
}
}
return PR_FALSE;
}
//-------------------------------------------------------
//
// KeyDown
//
NS_IMETHODIMP nsPrintPreviewListener::KeyDown(nsIDOMEvent* aKeyEvent)
{
if (!IsKeyOK(aKeyEvent)) {
aKeyEvent->PreventDefault();
}
return NS_OK;
}
//-------------------------------------------------------
//
// KeyUp
//
NS_IMETHODIMP nsPrintPreviewListener::KeyUp(nsIDOMEvent* aKeyEvent)
{
if (!IsKeyOK(aKeyEvent)) {
aKeyEvent->PreventDefault();
}
return NS_OK;
}
//-------------------------------------------------------
//
// KeyPress
//
NS_IMETHODIMP nsPrintPreviewListener::KeyPress(nsIDOMEvent* aKeyEvent)
{
if (!IsKeyOK(aKeyEvent)) {
aKeyEvent->PreventDefault();
}
return NS_OK;
}