The Tor Browser / file comparison
comparison: accessible/src/windows/msaa/nsWinUtils.cpp
accessible/src/windows/msaa/nsWinUtils.cpp
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
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| -1:000000000000 | 0:fc234eb51fb2 |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim:expandtab:shiftwidth=2:tabstop=2: | |
| 3 */ | |
| 4 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 5 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 6 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 7 | |
| 8 #include "nsWinUtils.h" | |
| 9 | |
| 10 #include "Compatibility.h" | |
| 11 #include "DocAccessible.h" | |
| 12 #include "nsCoreUtils.h" | |
| 13 | |
| 14 #include "mozilla/Preferences.h" | |
| 15 #include "nsArrayUtils.h" | |
| 16 #include "nsIArray.h" | |
| 17 #include "nsIDocument.h" | |
| 18 #include "nsIDocShellTreeItem.h" | |
| 19 #include "nsXULAppAPI.h" | |
| 20 | |
| 21 using namespace mozilla; | |
| 22 using namespace mozilla::a11y; | |
| 23 | |
| 24 // Window property used by ipc related code in identifying accessible | |
| 25 // tab windows. | |
| 26 const wchar_t* kPropNameTabContent = L"AccessibleTabWindow"; | |
| 27 | |
| 28 /** | |
| 29 * WindowProc to process WM_GETOBJECT messages, used in windows emulation mode. | |
| 30 */ | |
| 31 static LRESULT CALLBACK WindowProc(HWND hWnd, UINT msg, | |
| 32 WPARAM wParam, LPARAM lParam); | |
| 33 | |
| 34 nsRefPtrHashtable<nsPtrHashKey<void>, DocAccessible>* nsWinUtils::sHWNDCache = nullptr; | |
| 35 | |
| 36 already_AddRefed<nsIDOMCSSStyleDeclaration> | |
| 37 nsWinUtils::GetComputedStyleDeclaration(nsIContent* aContent) | |
| 38 { | |
| 39 nsIContent* elm = nsCoreUtils::GetDOMElementFor(aContent); | |
| 40 if (!elm) | |
| 41 return nullptr; | |
| 42 | |
| 43 // Returns number of items in style declaration | |
| 44 nsCOMPtr<nsIDOMWindow> window = | |
| 45 do_QueryInterface(elm->OwnerDoc()->GetWindow()); | |
| 46 if (!window) | |
| 47 return nullptr; | |
| 48 | |
| 49 nsCOMPtr<nsIDOMCSSStyleDeclaration> cssDecl; | |
| 50 nsCOMPtr<nsIDOMElement> domElement(do_QueryInterface(elm)); | |
| 51 window->GetComputedStyle(domElement, EmptyString(), getter_AddRefs(cssDecl)); | |
| 52 return cssDecl.forget(); | |
| 53 } | |
| 54 | |
| 55 bool | |
| 56 nsWinUtils::MaybeStartWindowEmulation() | |
| 57 { | |
| 58 // Register window class that'll be used for document accessibles associated | |
| 59 // with tabs. | |
| 60 if (Compatibility::IsJAWS() || Compatibility::IsWE() || | |
| 61 Compatibility::IsDolphin() || | |
| 62 XRE_GetProcessType() == GeckoProcessType_Content) { | |
| 63 RegisterNativeWindow(kClassNameTabContent); | |
| 64 sHWNDCache = new nsRefPtrHashtable<nsPtrHashKey<void>, DocAccessible>(4); | |
| 65 return true; | |
| 66 } | |
| 67 | |
| 68 return false; | |
| 69 } | |
| 70 | |
| 71 void | |
| 72 nsWinUtils::ShutdownWindowEmulation() | |
| 73 { | |
| 74 // Unregister window call that's used for document accessibles associated | |
| 75 // with tabs. | |
| 76 if (IsWindowEmulationStarted()) | |
| 77 ::UnregisterClassW(kClassNameTabContent, GetModuleHandle(nullptr)); | |
| 78 } | |
| 79 | |
| 80 bool | |
| 81 nsWinUtils::IsWindowEmulationStarted() | |
| 82 { | |
| 83 return sHWNDCache != nullptr; | |
| 84 } | |
| 85 | |
| 86 void | |
| 87 nsWinUtils::RegisterNativeWindow(LPCWSTR aWindowClass) | |
| 88 { | |
| 89 WNDCLASSW wc; | |
| 90 wc.style = CS_GLOBALCLASS; | |
| 91 wc.lpfnWndProc = WindowProc; | |
| 92 wc.cbClsExtra = 0; | |
| 93 wc.cbWndExtra = 0; | |
| 94 wc.hInstance = GetModuleHandle(nullptr); | |
| 95 wc.hIcon = nullptr; | |
| 96 wc.hCursor = nullptr; | |
| 97 wc.hbrBackground = nullptr; | |
| 98 wc.lpszMenuName = nullptr; | |
| 99 wc.lpszClassName = aWindowClass; | |
| 100 ::RegisterClassW(&wc); | |
| 101 } | |
| 102 | |
| 103 HWND | |
| 104 nsWinUtils::CreateNativeWindow(LPCWSTR aWindowClass, HWND aParentWnd, | |
| 105 int aX, int aY, int aWidth, int aHeight, | |
| 106 bool aIsActive) | |
| 107 { | |
| 108 HWND hwnd = ::CreateWindowExW(WS_EX_TRANSPARENT, aWindowClass, | |
| 109 L"NetscapeDispatchWnd", | |
| 110 WS_CHILD | (aIsActive ? WS_VISIBLE : 0), | |
| 111 aX, aY, aWidth, aHeight, | |
| 112 aParentWnd, | |
| 113 nullptr, | |
| 114 GetModuleHandle(nullptr), | |
| 115 nullptr); | |
| 116 if (hwnd) { | |
| 117 // Mark this window so that ipc related code can identify it. | |
| 118 ::SetPropW(hwnd, kPropNameTabContent, (HANDLE)1); | |
| 119 } | |
| 120 return hwnd; | |
| 121 } | |
| 122 | |
| 123 void | |
| 124 nsWinUtils::ShowNativeWindow(HWND aWnd) | |
| 125 { | |
| 126 ::ShowWindow(aWnd, SW_SHOW); | |
| 127 } | |
| 128 | |
| 129 void | |
| 130 nsWinUtils::HideNativeWindow(HWND aWnd) | |
| 131 { | |
| 132 ::SetWindowPos(aWnd, nullptr, 0, 0, 0, 0, | |
| 133 SWP_HIDEWINDOW | SWP_NOSIZE | SWP_NOMOVE | | |
| 134 SWP_NOZORDER | SWP_NOACTIVATE); | |
| 135 } | |
| 136 | |
| 137 LRESULT CALLBACK | |
| 138 WindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) | |
| 139 { | |
| 140 // Note, this window's message handling should not invoke any call that | |
| 141 // may result in a cross-process ipc call. Doing so may violate RPC | |
| 142 // message semantics. | |
| 143 | |
| 144 switch (msg) { | |
| 145 case WM_GETOBJECT: | |
| 146 { | |
| 147 if (lParam == OBJID_CLIENT) { | |
| 148 DocAccessible* document = | |
| 149 nsWinUtils::sHWNDCache->GetWeak(static_cast<void*>(hWnd)); | |
| 150 if (document) { | |
| 151 IAccessible* msaaAccessible = nullptr; | |
| 152 document->GetNativeInterface((void**)&msaaAccessible); // does an addref | |
| 153 if (msaaAccessible) { | |
| 154 LRESULT result = ::LresultFromObject(IID_IAccessible, wParam, | |
| 155 msaaAccessible); // does an addref | |
| 156 msaaAccessible->Release(); // release extra addref | |
| 157 return result; | |
| 158 } | |
| 159 } | |
| 160 } | |
| 161 return 0; | |
| 162 } | |
| 163 case WM_NCHITTEST: | |
| 164 { | |
| 165 LRESULT lRet = ::DefWindowProc(hWnd, msg, wParam, lParam); | |
| 166 if (HTCLIENT == lRet) | |
| 167 lRet = HTTRANSPARENT; | |
| 168 return lRet; | |
| 169 } | |
| 170 } | |
| 171 | |
| 172 return ::DefWindowProcW(hWnd, msg, wParam, lParam); | |
| 173 } |
