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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#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(nullptr == 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 nullptr;
}
WindowHook::MessageData *
WindowHook::LookupOrCreate(UINT nMsg) {
MessageData *data = Lookup(nMsg);
if (!data) {
data = mMessageData.AppendElement();
if (!data)
return nullptr;
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;
uint32_t length = data->monitors.Length();
for (uint32_t 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
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