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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /accessible/windows/msaa/nsWinUtils.cpp | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | accessible/windows/msaa/nsWinUtils.cpp | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/accessible/windows/msaa/nsWinUtils.cpp b/accessible/windows/msaa/nsWinUtils.cpp new file mode 100644 index 0000000000..6eb7d290dd --- /dev/null +++ b/accessible/windows/msaa/nsWinUtils.cpp @@ -0,0 +1,167 @@ +/* -*- 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/a11y/DocAccessibleParent.h" +#include "mozilla/Preferences.h" +#include "nsArrayUtils.h" +#include "nsICSSDeclaration.h" +#include "mozilla/dom/Document.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<nsICSSDeclaration> 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<Element> domElement(do_QueryInterface(elm)); + nsCOMPtr<nsICSSDeclaration> cssDecl = + window->GetComputedStyle(*domElement, u""_ns, dummy); + dummy.SuppressException(); + return cssDecl.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() || Compatibility::IsVisperoShared()) { + 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, + NativeWindowCreateProc* aOnCreateProc) { + return ::CreateWindowExW( + WS_EX_TRANSPARENT, aWindowClass, L"NetscapeDispatchWnd", + WS_CHILD | (aIsActive ? WS_VISIBLE : 0), aX, aY, aWidth, aHeight, + aParentWnd, nullptr, GetModuleHandle(nullptr), aOnCreateProc); +} + +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_CREATE: { + // Mark this window so that ipc related code can identify it. + ::SetPropW(hWnd, kPropNameTabContent, reinterpret_cast<HANDLE>(1)); + + auto createStruct = reinterpret_cast<CREATESTRUCT*>(lParam); + auto createProc = reinterpret_cast<nsWinUtils::NativeWindowCreateProc*>( + createStruct->lpCreateParams); + + if (createProc && *createProc) { + (*createProc)(hWnd); + } + + return 0; + } + 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) { + RefPtr<IAccessible> msaaAccessible; + DocAccessible* document = + reinterpret_cast<DocAccessible*>(::GetPropW(hWnd, kPropNameDocAcc)); + if (document) { + document->GetNativeInterface(getter_AddRefs(msaaAccessible)); + } else { + DocAccessibleParent* docParent = static_cast<DocAccessibleParent*>( + ::GetPropW(hWnd, kPropNameDocAccParent)); + if (docParent) { + msaaAccessible = MsaaAccessible::GetFrom(docParent); + } + } + if (msaaAccessible) { + LRESULT result = + ::LresultFromObject(IID_IAccessible, wParam, + msaaAccessible); // does an 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); +} |