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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /accessible/windows/msaa/nsWinUtils.cpp
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--accessible/windows/msaa/nsWinUtils.cpp167
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
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+++ b/accessible/windows/msaa/nsWinUtils.cpp
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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/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);
+}