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WindowHook.cpp
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WindowHook.cpp
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/* -*- Mode: C++; tab-width: 2; 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 mozilla.org code.
*
* The Initial Developer of the Original Code is
* Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Rob Arnold <tellrob@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 "WindowHook.h"
#include "nsWindow.h"
namespace mozilla {
namespace widget {
nsresult
WindowHook::AddHook(UINT nMsg, Callback callback, void *context) {
MessageData *data = LookupOrCreate(nMsg);
if (!data)
return NS_ERROR_OUT_OF_MEMORY;
// Ensure we don't overwrite another hook
NS_ENSURE_TRUE(nsnull == data->hook.cb, NS_ERROR_UNEXPECTED);
data->hook = CallbackData(callback, context);
return NS_OK;
}
nsresult
WindowHook::RemoveHook(UINT nMsg, Callback callback, void *context) {
CallbackData cbdata(callback, context);
MessageData *data = Lookup(nMsg);
if (!data)
return NS_ERROR_UNEXPECTED;
if (data->hook != cbdata)
return NS_ERROR_UNEXPECTED;
data->hook = CallbackData();
DeleteIfEmpty(data);
return NS_OK;
}
nsresult
WindowHook::AddMonitor(UINT nMsg, Callback callback, void *context) {
MessageData *data = LookupOrCreate(nMsg);
return (data && data->monitors.AppendElement(CallbackData(callback, context)))
? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
nsresult
WindowHook::RemoveMonitor(UINT nMsg, Callback callback, void *context) {
CallbackData cbdata(callback, context);
MessageData *data = Lookup(nMsg);
if (!data)
return NS_ERROR_UNEXPECTED;
CallbackDataArray::index_type idx = data->monitors.IndexOf(cbdata);
if (idx == CallbackDataArray::NoIndex)
return NS_ERROR_UNEXPECTED;
data->monitors.RemoveElementAt(idx);
DeleteIfEmpty(data);
return NS_OK;
}
WindowHook::MessageData *
WindowHook::Lookup(UINT nMsg) {
MessageDataArray::index_type idx;
for (idx = 0; idx < mMessageData.Length(); idx++) {
MessageData &data = mMessageData[idx];
if (data.nMsg == nMsg)
return &data;
}
return nsnull;
}
WindowHook::MessageData *
WindowHook::LookupOrCreate(UINT nMsg) {
MessageData *data = Lookup(nMsg);
if (!data) {
data = mMessageData.AppendElement();
if (!data)
return nsnull;
data->nMsg = nMsg;
}
return data;
}
void
WindowHook::DeleteIfEmpty(MessageData *data) {
// Never remove a MessageData that has still a hook or monitor entries.
if (data->hook || !data->monitors.IsEmpty())
return;
MessageDataArray::index_type idx;
idx = data - mMessageData.Elements();
NS_ASSERTION(idx >= 0 && idx < mMessageData.Length(), "Attempted to delete MessageData that doesn't belong to this array!");
mMessageData.RemoveElementAt(idx);
}
bool
WindowHook::Notify(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam,
LRESULT *aResult) {
MessageData *data = Lookup(nMsg);
if (!data)
return false;
PRUint32 length = data->monitors.Length();
for (PRUint32 midx = 0; midx < length; midx++) {
data->monitors[midx].Invoke(hWnd, nMsg, wParam, lParam, aResult);
}
return data->hook.Invoke(hWnd, nMsg, wParam, lParam, aResult);
}
bool
WindowHook::CallbackData::Invoke(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam,
LRESULT *aResult) {
if (!cb)
return false;
return cb(context, hWnd, msg, wParam, lParam, aResult);
}
} // namespace widget
} // namespace mozilla