1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/accessible/src/windows/msaa/nsWinUtils.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,173 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim:expandtab:shiftwidth=2:tabstop=2:
1.6 + */
1.7 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.8 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.9 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.10 +
1.11 +#include "nsWinUtils.h"
1.12 +
1.13 +#include "Compatibility.h"
1.14 +#include "DocAccessible.h"
1.15 +#include "nsCoreUtils.h"
1.16 +
1.17 +#include "mozilla/Preferences.h"
1.18 +#include "nsArrayUtils.h"
1.19 +#include "nsIArray.h"
1.20 +#include "nsIDocument.h"
1.21 +#include "nsIDocShellTreeItem.h"
1.22 +#include "nsXULAppAPI.h"
1.23 +
1.24 +using namespace mozilla;
1.25 +using namespace mozilla::a11y;
1.26 +
1.27 +// Window property used by ipc related code in identifying accessible
1.28 +// tab windows.
1.29 +const wchar_t* kPropNameTabContent = L"AccessibleTabWindow";
1.30 +
1.31 +/**
1.32 + * WindowProc to process WM_GETOBJECT messages, used in windows emulation mode.
1.33 + */
1.34 +static LRESULT CALLBACK WindowProc(HWND hWnd, UINT msg,
1.35 + WPARAM wParam, LPARAM lParam);
1.36 +
1.37 +nsRefPtrHashtable<nsPtrHashKey<void>, DocAccessible>* nsWinUtils::sHWNDCache = nullptr;
1.38 +
1.39 +already_AddRefed<nsIDOMCSSStyleDeclaration>
1.40 +nsWinUtils::GetComputedStyleDeclaration(nsIContent* aContent)
1.41 +{
1.42 + nsIContent* elm = nsCoreUtils::GetDOMElementFor(aContent);
1.43 + if (!elm)
1.44 + return nullptr;
1.45 +
1.46 + // Returns number of items in style declaration
1.47 + nsCOMPtr<nsIDOMWindow> window =
1.48 + do_QueryInterface(elm->OwnerDoc()->GetWindow());
1.49 + if (!window)
1.50 + return nullptr;
1.51 +
1.52 + nsCOMPtr<nsIDOMCSSStyleDeclaration> cssDecl;
1.53 + nsCOMPtr<nsIDOMElement> domElement(do_QueryInterface(elm));
1.54 + window->GetComputedStyle(domElement, EmptyString(), getter_AddRefs(cssDecl));
1.55 + return cssDecl.forget();
1.56 +}
1.57 +
1.58 +bool
1.59 +nsWinUtils::MaybeStartWindowEmulation()
1.60 +{
1.61 + // Register window class that'll be used for document accessibles associated
1.62 + // with tabs.
1.63 + if (Compatibility::IsJAWS() || Compatibility::IsWE() ||
1.64 + Compatibility::IsDolphin() ||
1.65 + XRE_GetProcessType() == GeckoProcessType_Content) {
1.66 + RegisterNativeWindow(kClassNameTabContent);
1.67 + sHWNDCache = new nsRefPtrHashtable<nsPtrHashKey<void>, DocAccessible>(4);
1.68 + return true;
1.69 + }
1.70 +
1.71 + return false;
1.72 +}
1.73 +
1.74 +void
1.75 +nsWinUtils::ShutdownWindowEmulation()
1.76 +{
1.77 + // Unregister window call that's used for document accessibles associated
1.78 + // with tabs.
1.79 + if (IsWindowEmulationStarted())
1.80 + ::UnregisterClassW(kClassNameTabContent, GetModuleHandle(nullptr));
1.81 +}
1.82 +
1.83 +bool
1.84 +nsWinUtils::IsWindowEmulationStarted()
1.85 +{
1.86 + return sHWNDCache != nullptr;
1.87 +}
1.88 +
1.89 +void
1.90 +nsWinUtils::RegisterNativeWindow(LPCWSTR aWindowClass)
1.91 +{
1.92 + WNDCLASSW wc;
1.93 + wc.style = CS_GLOBALCLASS;
1.94 + wc.lpfnWndProc = WindowProc;
1.95 + wc.cbClsExtra = 0;
1.96 + wc.cbWndExtra = 0;
1.97 + wc.hInstance = GetModuleHandle(nullptr);
1.98 + wc.hIcon = nullptr;
1.99 + wc.hCursor = nullptr;
1.100 + wc.hbrBackground = nullptr;
1.101 + wc.lpszMenuName = nullptr;
1.102 + wc.lpszClassName = aWindowClass;
1.103 + ::RegisterClassW(&wc);
1.104 +}
1.105 +
1.106 +HWND
1.107 +nsWinUtils::CreateNativeWindow(LPCWSTR aWindowClass, HWND aParentWnd,
1.108 + int aX, int aY, int aWidth, int aHeight,
1.109 + bool aIsActive)
1.110 +{
1.111 + HWND hwnd = ::CreateWindowExW(WS_EX_TRANSPARENT, aWindowClass,
1.112 + L"NetscapeDispatchWnd",
1.113 + WS_CHILD | (aIsActive ? WS_VISIBLE : 0),
1.114 + aX, aY, aWidth, aHeight,
1.115 + aParentWnd,
1.116 + nullptr,
1.117 + GetModuleHandle(nullptr),
1.118 + nullptr);
1.119 + if (hwnd) {
1.120 + // Mark this window so that ipc related code can identify it.
1.121 + ::SetPropW(hwnd, kPropNameTabContent, (HANDLE)1);
1.122 + }
1.123 + return hwnd;
1.124 +}
1.125 +
1.126 +void
1.127 +nsWinUtils::ShowNativeWindow(HWND aWnd)
1.128 +{
1.129 + ::ShowWindow(aWnd, SW_SHOW);
1.130 +}
1.131 +
1.132 +void
1.133 +nsWinUtils::HideNativeWindow(HWND aWnd)
1.134 +{
1.135 + ::SetWindowPos(aWnd, nullptr, 0, 0, 0, 0,
1.136 + SWP_HIDEWINDOW | SWP_NOSIZE | SWP_NOMOVE |
1.137 + SWP_NOZORDER | SWP_NOACTIVATE);
1.138 +}
1.139 +
1.140 +LRESULT CALLBACK
1.141 +WindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
1.142 +{
1.143 + // Note, this window's message handling should not invoke any call that
1.144 + // may result in a cross-process ipc call. Doing so may violate RPC
1.145 + // message semantics.
1.146 +
1.147 + switch (msg) {
1.148 + case WM_GETOBJECT:
1.149 + {
1.150 + if (lParam == OBJID_CLIENT) {
1.151 + DocAccessible* document =
1.152 + nsWinUtils::sHWNDCache->GetWeak(static_cast<void*>(hWnd));
1.153 + if (document) {
1.154 + IAccessible* msaaAccessible = nullptr;
1.155 + document->GetNativeInterface((void**)&msaaAccessible); // does an addref
1.156 + if (msaaAccessible) {
1.157 + LRESULT result = ::LresultFromObject(IID_IAccessible, wParam,
1.158 + msaaAccessible); // does an addref
1.159 + msaaAccessible->Release(); // release extra addref
1.160 + return result;
1.161 + }
1.162 + }
1.163 + }
1.164 + return 0;
1.165 + }
1.166 + case WM_NCHITTEST:
1.167 + {
1.168 + LRESULT lRet = ::DefWindowProc(hWnd, msg, wParam, lParam);
1.169 + if (HTCLIENT == lRet)
1.170 + lRet = HTTRANSPARENT;
1.171 + return lRet;
1.172 + }
1.173 + }
1.174 +
1.175 + return ::DefWindowProcW(hWnd, msg, wParam, lParam);
1.176 +}
