michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  *
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "WindowHook.h"
michael@0: #include "nsWindow.h"
michael@0: #include "nsWindowDefs.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace widget {
michael@0: 
michael@0: nsresult
michael@0: WindowHook::AddHook(UINT nMsg, Callback callback, void *context) {
michael@0:   MessageData *data = LookupOrCreate(nMsg);
michael@0: 
michael@0:   if (!data)
michael@0:     return NS_ERROR_OUT_OF_MEMORY;
michael@0: 
michael@0:   // Ensure we don't overwrite another hook
michael@0:   NS_ENSURE_TRUE(nullptr == data->hook.cb, NS_ERROR_UNEXPECTED);
michael@0: 
michael@0:   data->hook = CallbackData(callback, context);
michael@0: 
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: WindowHook::RemoveHook(UINT nMsg, Callback callback, void *context) {
michael@0:   CallbackData cbdata(callback, context);
michael@0:   MessageData *data = Lookup(nMsg);
michael@0:   if (!data)
michael@0:     return NS_ERROR_UNEXPECTED;
michael@0:   if (data->hook != cbdata)
michael@0:     return NS_ERROR_UNEXPECTED;
michael@0:   data->hook = CallbackData();
michael@0: 
michael@0:   DeleteIfEmpty(data);
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: WindowHook::AddMonitor(UINT nMsg, Callback callback, void *context) {
michael@0:   MessageData *data = LookupOrCreate(nMsg);
michael@0:   return (data && data->monitors.AppendElement(CallbackData(callback, context)))
michael@0:          ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: WindowHook::RemoveMonitor(UINT nMsg, Callback callback, void *context) {
michael@0:   CallbackData cbdata(callback, context);
michael@0:   MessageData *data = Lookup(nMsg);
michael@0:   if (!data)
michael@0:     return NS_ERROR_UNEXPECTED;
michael@0:   CallbackDataArray::index_type idx = data->monitors.IndexOf(cbdata);
michael@0:   if (idx == CallbackDataArray::NoIndex)
michael@0:     return NS_ERROR_UNEXPECTED;
michael@0:   data->monitors.RemoveElementAt(idx);
michael@0:   DeleteIfEmpty(data);
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: WindowHook::MessageData *
michael@0: WindowHook::Lookup(UINT nMsg) {
michael@0:   MessageDataArray::index_type idx;
michael@0:   for (idx = 0; idx < mMessageData.Length(); idx++) {
michael@0:     MessageData &data = mMessageData[idx];
michael@0:     if (data.nMsg == nMsg)
michael@0:       return &data;
michael@0:   }
michael@0:   return nullptr;
michael@0: }
michael@0: 
michael@0: WindowHook::MessageData *
michael@0: WindowHook::LookupOrCreate(UINT nMsg) {
michael@0:   MessageData *data = Lookup(nMsg);
michael@0:   if (!data) {
michael@0:     data = mMessageData.AppendElement();
michael@0: 
michael@0:     if (!data)
michael@0:       return nullptr;
michael@0: 
michael@0:     data->nMsg = nMsg;
michael@0:   }
michael@0:   return data;
michael@0: }
michael@0: 
michael@0: void
michael@0: WindowHook::DeleteIfEmpty(MessageData *data) {
michael@0:   // Never remove a MessageData that has still a hook or monitor entries.
michael@0:   if (data->hook || !data->monitors.IsEmpty())
michael@0:     return;
michael@0: 
michael@0:   MessageDataArray::index_type idx;
michael@0:   idx = data - mMessageData.Elements();
michael@0:   NS_ASSERTION(idx >= 0 && idx < mMessageData.Length(), "Attempted to delete MessageData that doesn't belong to this array!");
michael@0:   mMessageData.RemoveElementAt(idx);
michael@0: }
michael@0: 
michael@0: bool
michael@0: WindowHook::Notify(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam,
michael@0:                    MSGResult& aResult)
michael@0: {
michael@0:   MessageData *data = Lookup(nMsg);
michael@0:   if (!data)
michael@0:     return false;
michael@0: 
michael@0:   uint32_t length = data->monitors.Length();
michael@0:   for (uint32_t midx = 0; midx < length; midx++) {
michael@0:     data->monitors[midx].Invoke(hWnd, nMsg, wParam, lParam, &aResult.mResult);
michael@0:   }
michael@0: 
michael@0:   aResult.mConsumed =
michael@0:     data->hook.Invoke(hWnd, nMsg, wParam, lParam, &aResult.mResult);
michael@0:   return aResult.mConsumed;
michael@0: }
michael@0: 
michael@0: bool
michael@0: WindowHook::CallbackData::Invoke(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam,
michael@0:                                  LRESULT *aResult) {
michael@0:   if (!cb)
michael@0:     return false;
michael@0:   return cb(context, hWnd, msg, wParam, lParam, aResult);
michael@0: }
michael@0: } // namespace widget
michael@0: } // namespace mozilla
michael@0: