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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:expandtab:shiftwidth=2:tabstop=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 "nsWinUtils.h"
#include "Compatibility.h"
#include "DocAccessible.h"
#include "nsAccessibilityService.h"
#include "nsCoreUtils.h"
#include "mozilla/Preferences.h"
#include "nsArrayUtils.h"
#include "nsIArray.h"
#include "nsICSSDeclaration.h"
#include "nsIDocument.h"
#include "nsIDocShellTreeItem.h"
#include "mozilla/dom/Element.h"
#include "nsXULAppAPI.h"
using namespace mozilla;
using namespace mozilla::a11y;
using mozilla::dom::Element;
// Window property used by ipc related code in identifying accessible
// tab windows.
const wchar_t* kPropNameTabContent = L"AccessibleTabWindow";
/**
* WindowProc to process WM_GETOBJECT messages, used in windows emulation mode.
*/
static LRESULT CALLBACK WindowProc(HWND hWnd, UINT msg,
WPARAM wParam, LPARAM lParam);
bool nsWinUtils::sWindowEmulationStarted = false;
already_AddRefed<nsIDOMCSSStyleDeclaration>
nsWinUtils::GetComputedStyleDeclaration(nsIContent* aContent)
{
nsIContent* elm = nsCoreUtils::GetDOMElementFor(aContent);
if (!elm)
return nullptr;
// Returns number of items in style declaration
nsCOMPtr<nsPIDOMWindowInner> window = elm->OwnerDoc()->GetInnerWindow();
if (!window)
return nullptr;
ErrorResult dummy;
nsCOMPtr<nsICSSDeclaration> cssDecl;
nsCOMPtr<Element> domElement(do_QueryInterface(elm));
cssDecl = window->GetComputedStyle(*domElement, EmptyString(), dummy);
nsCOMPtr<nsIDOMCSSStyleDeclaration> domDecl = do_QueryInterface(cssDecl);
dummy.SuppressException();
return domDecl.forget();
}
bool
nsWinUtils::MaybeStartWindowEmulation()
{
// Register window class that'll be used for document accessibles associated
// with tabs.
if (IPCAccessibilityActive())
return false;
if (Compatibility::IsJAWS() || Compatibility::IsWE() ||
Compatibility::IsDolphin() ||
XRE_IsContentProcess()) {
RegisterNativeWindow(kClassNameTabContent);
sWindowEmulationStarted = true;
return true;
}
return false;
}
void
nsWinUtils::ShutdownWindowEmulation()
{
// Unregister window call that's used for document accessibles associated
// with tabs.
if (IsWindowEmulationStarted()) {
::UnregisterClassW(kClassNameTabContent, GetModuleHandle(nullptr));
sWindowEmulationStarted = false;
}
}
void
nsWinUtils::RegisterNativeWindow(LPCWSTR aWindowClass)
{
WNDCLASSW wc;
wc.style = CS_GLOBALCLASS;
wc.lpfnWndProc = WindowProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = GetModuleHandle(nullptr);
wc.hIcon = nullptr;
wc.hCursor = nullptr;
wc.hbrBackground = nullptr;
wc.lpszMenuName = nullptr;
wc.lpszClassName = aWindowClass;
::RegisterClassW(&wc);
}
HWND
nsWinUtils::CreateNativeWindow(LPCWSTR aWindowClass, HWND aParentWnd,
int aX, int aY, int aWidth, int aHeight,
bool aIsActive)
{
HWND hwnd = ::CreateWindowExW(WS_EX_TRANSPARENT, aWindowClass,
L"NetscapeDispatchWnd",
WS_CHILD | (aIsActive ? WS_VISIBLE : 0),
aX, aY, aWidth, aHeight,
aParentWnd,
nullptr,
GetModuleHandle(nullptr),
nullptr);
if (hwnd) {
// Mark this window so that ipc related code can identify it.
::SetPropW(hwnd, kPropNameTabContent, (HANDLE)1);
}
return hwnd;
}
void
nsWinUtils::ShowNativeWindow(HWND aWnd)
{
::ShowWindow(aWnd, SW_SHOW);
}
void
nsWinUtils::HideNativeWindow(HWND aWnd)
{
::SetWindowPos(aWnd, nullptr, 0, 0, 0, 0,
SWP_HIDEWINDOW | SWP_NOSIZE | SWP_NOMOVE |
SWP_NOZORDER | SWP_NOACTIVATE);
}
LRESULT CALLBACK
WindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
// Note, this window's message handling should not invoke any call that
// may result in a cross-process ipc call. Doing so may violate RPC
// message semantics.
switch (msg) {
case WM_GETOBJECT:
{
// Do explicit casting to make it working on 64bit systems (see bug 649236
// for details).
int32_t objId = static_cast<DWORD>(lParam);
if (objId == OBJID_CLIENT) {
DocAccessible* document =
reinterpret_cast<DocAccessible*>(::GetPropW(hWnd, kPropNameDocAcc));
if (document) {
IAccessible* msaaAccessible = nullptr;
document->GetNativeInterface((void**)&msaaAccessible); // does an addref
if (msaaAccessible) {
LRESULT result = ::LresultFromObject(IID_IAccessible, wParam,
msaaAccessible); // does an addref
msaaAccessible->Release(); // release extra addref
return result;
}
}
}
return 0;
}
case WM_NCHITTEST:
{
LRESULT lRet = ::DefWindowProc(hWnd, msg, wParam, lParam);
if (HTCLIENT == lRet)
lRet = HTTRANSPARENT;
return lRet;
}
}
return ::DefWindowProcW(hWnd, msg, wParam, lParam);
}
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