141 lines
4.6 KiB
C++
141 lines
4.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "AccessibleWrap.h"
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#include "mozilla/a11y/DocAccessibleParent.h"
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#include "AccEvent.h"
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#include "nsAccUtils.h"
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#include "nsIAccessibleEvent.h"
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#include "nsIWidget.h"
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#include "nsWindowsHelpers.h"
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#include "mozilla/a11y/HyperTextAccessible.h"
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#include "mozilla/a11y/RemoteAccessible.h"
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#include "ServiceProvider.h"
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#include "sdnAccessible.h"
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#include "LocalAccessible-inl.h"
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using namespace mozilla;
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using namespace mozilla::a11y;
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/* For documentation of the accessibility architecture,
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* see http://lxr.mozilla.org/seamonkey/source/accessible/accessible-docs.html
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*/
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////////////////////////////////////////////////////////////////////////////////
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// AccessibleWrap
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////////////////////////////////////////////////////////////////////////////////
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AccessibleWrap::AccessibleWrap(nsIContent* aContent, DocAccessible* aDoc)
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: LocalAccessible(aContent, aDoc) {}
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AccessibleWrap::~AccessibleWrap() = default;
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NS_IMPL_ISUPPORTS_INHERITED0(AccessibleWrap, LocalAccessible)
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void AccessibleWrap::Shutdown() {
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if (mMsaa) {
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mMsaa->MsaaShutdown();
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// Don't release mMsaa here because this will cause its id to be released
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// immediately, which will result in immediate reuse, causing problems
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// for clients. Instead, we release it in the destructor.
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}
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LocalAccessible::Shutdown();
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}
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//-----------------------------------------------------
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// IUnknown interface methods - see iunknown.h for documentation
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//-----------------------------------------------------
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MsaaAccessible* AccessibleWrap::GetMsaa() {
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if (!mMsaa) {
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mMsaa = MsaaAccessible::Create(this);
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}
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return mMsaa;
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}
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void AccessibleWrap::GetNativeInterface(void** aOutAccessible) {
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RefPtr<IAccessible> result = GetMsaa();
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return result.forget(aOutAccessible);
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}
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////////////////////////////////////////////////////////////////////////////////
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// AccessibleWrap
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//------- Helper methods ---------
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bool AccessibleWrap::IsRootForHWND() {
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if (IsRoot()) {
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return true;
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}
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HWND thisHwnd = MsaaAccessible::GetHWNDFor(this);
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AccessibleWrap* parent = static_cast<AccessibleWrap*>(LocalParent());
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MOZ_ASSERT(parent);
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HWND parentHwnd = MsaaAccessible::GetHWNDFor(parent);
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return thisHwnd != parentHwnd;
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}
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static void UpdateSystemCaretForHwnd(HWND aCaretWnd,
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const LayoutDeviceIntRect& aCaretRect) {
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if (!aCaretWnd || aCaretRect.IsEmpty()) {
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return;
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}
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// Create invisible bitmap for caret, otherwise its appearance interferes
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// with Gecko caret
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nsAutoBitmap caretBitMap(CreateBitmap(1, aCaretRect.Height(), 1, 1, nullptr));
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if (::CreateCaret(aCaretWnd, caretBitMap, 1,
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aCaretRect.Height())) { // Also destroys the last caret
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::ShowCaret(aCaretWnd);
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POINT clientPoint{aCaretRect.X(), aCaretRect.Y()};
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::ScreenToClient(aCaretWnd, &clientPoint);
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::SetCaretPos(clientPoint.x, clientPoint.y);
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}
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}
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/* static */
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void AccessibleWrap::UpdateSystemCaretFor(
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Accessible* aAccessible, const LayoutDeviceIntRect& aCaretRect) {
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if (LocalAccessible* localAcc = aAccessible->AsLocal()) {
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// XXX We need the widget for LocalAccessible, so we have to call
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// HyperTextAccessible::GetCaretRect. We should find some way of avoiding
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// the need for the widget.
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UpdateSystemCaretFor(localAcc);
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} else {
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UpdateSystemCaretFor(aAccessible->AsRemote(), aCaretRect);
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}
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}
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/* static */
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void AccessibleWrap::UpdateSystemCaretFor(LocalAccessible* aAccessible) {
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// Move the system caret so that Windows Tablet Edition and tradional ATs with
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// off-screen model can follow the caret
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::DestroyCaret();
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HyperTextAccessible* text = aAccessible->AsHyperText();
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if (!text) return;
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nsIWidget* widget = nullptr;
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LayoutDeviceIntRect caretRect = text->GetCaretRect(&widget);
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if (!widget) {
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return;
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}
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HWND caretWnd =
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reinterpret_cast<HWND>(widget->GetNativeData(NS_NATIVE_WINDOW));
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UpdateSystemCaretForHwnd(caretWnd, caretRect);
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}
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/* static */
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void AccessibleWrap::UpdateSystemCaretFor(
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RemoteAccessible* aProxy, const LayoutDeviceIntRect& aCaretRect) {
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::DestroyCaret();
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// The HWND should be the real widget HWND, not an emulated HWND.
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// We get the HWND from the proxy's outer doc to bypass window emulation.
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LocalAccessible* outerDoc = aProxy->OuterDocOfRemoteBrowser();
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UpdateSystemCaretForHwnd(MsaaAccessible::GetHWNDFor(outerDoc), aCaretRect);
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}
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