1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/widget/windows/WindowHook.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,128 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + *
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "WindowHook.h"
1.11 +#include "nsWindow.h"
1.12 +#include "nsWindowDefs.h"
1.13 +
1.14 +namespace mozilla {
1.15 +namespace widget {
1.16 +
1.17 +nsresult
1.18 +WindowHook::AddHook(UINT nMsg, Callback callback, void *context) {
1.19 + MessageData *data = LookupOrCreate(nMsg);
1.20 +
1.21 + if (!data)
1.22 + return NS_ERROR_OUT_OF_MEMORY;
1.23 +
1.24 + // Ensure we don't overwrite another hook
1.25 + NS_ENSURE_TRUE(nullptr == data->hook.cb, NS_ERROR_UNEXPECTED);
1.26 +
1.27 + data->hook = CallbackData(callback, context);
1.28 +
1.29 + return NS_OK;
1.30 +}
1.31 +
1.32 +nsresult
1.33 +WindowHook::RemoveHook(UINT nMsg, Callback callback, void *context) {
1.34 + CallbackData cbdata(callback, context);
1.35 + MessageData *data = Lookup(nMsg);
1.36 + if (!data)
1.37 + return NS_ERROR_UNEXPECTED;
1.38 + if (data->hook != cbdata)
1.39 + return NS_ERROR_UNEXPECTED;
1.40 + data->hook = CallbackData();
1.41 +
1.42 + DeleteIfEmpty(data);
1.43 + return NS_OK;
1.44 +}
1.45 +
1.46 +nsresult
1.47 +WindowHook::AddMonitor(UINT nMsg, Callback callback, void *context) {
1.48 + MessageData *data = LookupOrCreate(nMsg);
1.49 + return (data && data->monitors.AppendElement(CallbackData(callback, context)))
1.50 + ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
1.51 +}
1.52 +
1.53 +nsresult
1.54 +WindowHook::RemoveMonitor(UINT nMsg, Callback callback, void *context) {
1.55 + CallbackData cbdata(callback, context);
1.56 + MessageData *data = Lookup(nMsg);
1.57 + if (!data)
1.58 + return NS_ERROR_UNEXPECTED;
1.59 + CallbackDataArray::index_type idx = data->monitors.IndexOf(cbdata);
1.60 + if (idx == CallbackDataArray::NoIndex)
1.61 + return NS_ERROR_UNEXPECTED;
1.62 + data->monitors.RemoveElementAt(idx);
1.63 + DeleteIfEmpty(data);
1.64 + return NS_OK;
1.65 +}
1.66 +
1.67 +WindowHook::MessageData *
1.68 +WindowHook::Lookup(UINT nMsg) {
1.69 + MessageDataArray::index_type idx;
1.70 + for (idx = 0; idx < mMessageData.Length(); idx++) {
1.71 + MessageData &data = mMessageData[idx];
1.72 + if (data.nMsg == nMsg)
1.73 + return &data;
1.74 + }
1.75 + return nullptr;
1.76 +}
1.77 +
1.78 +WindowHook::MessageData *
1.79 +WindowHook::LookupOrCreate(UINT nMsg) {
1.80 + MessageData *data = Lookup(nMsg);
1.81 + if (!data) {
1.82 + data = mMessageData.AppendElement();
1.83 +
1.84 + if (!data)
1.85 + return nullptr;
1.86 +
1.87 + data->nMsg = nMsg;
1.88 + }
1.89 + return data;
1.90 +}
1.91 +
1.92 +void
1.93 +WindowHook::DeleteIfEmpty(MessageData *data) {
1.94 + // Never remove a MessageData that has still a hook or monitor entries.
1.95 + if (data->hook || !data->monitors.IsEmpty())
1.96 + return;
1.97 +
1.98 + MessageDataArray::index_type idx;
1.99 + idx = data - mMessageData.Elements();
1.100 + NS_ASSERTION(idx >= 0 && idx < mMessageData.Length(), "Attempted to delete MessageData that doesn't belong to this array!");
1.101 + mMessageData.RemoveElementAt(idx);
1.102 +}
1.103 +
1.104 +bool
1.105 +WindowHook::Notify(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam,
1.106 + MSGResult& aResult)
1.107 +{
1.108 + MessageData *data = Lookup(nMsg);
1.109 + if (!data)
1.110 + return false;
1.111 +
1.112 + uint32_t length = data->monitors.Length();
1.113 + for (uint32_t midx = 0; midx < length; midx++) {
1.114 + data->monitors[midx].Invoke(hWnd, nMsg, wParam, lParam, &aResult.mResult);
1.115 + }
1.116 +
1.117 + aResult.mConsumed =
1.118 + data->hook.Invoke(hWnd, nMsg, wParam, lParam, &aResult.mResult);
1.119 + return aResult.mConsumed;
1.120 +}
1.121 +
1.122 +bool
1.123 +WindowHook::CallbackData::Invoke(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam,
1.124 + LRESULT *aResult) {
1.125 + if (!cb)
1.126 + return false;
1.127 + return cb(context, hWnd, msg, wParam, lParam, aResult);
1.128 +}
1.129 +} // namespace widget
1.130 +} // namespace mozilla
1.131 +
