diff options
Diffstat (limited to 'vcl/unx/gtk3/a11y/atkutil.cxx')
| -rw-r--r-- | vcl/unx/gtk3/a11y/atkutil.cxx | 637 |
1 files changed, 637 insertions, 0 deletions
diff --git a/vcl/unx/gtk3/a11y/atkutil.cxx b/vcl/unx/gtk3/a11y/atkutil.cxx new file mode 100644 index 000000000..a2c8b46b4 --- /dev/null +++ b/vcl/unx/gtk3/a11y/atkutil.cxx @@ -0,0 +1,637 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * 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/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#ifdef AIX +#define _LINUX_SOURCE_COMPAT +#include <sys/timer.h> +#undef _LINUX_SOURCE_COMPAT +#endif + +#include <com/sun/star/accessibility/XAccessibleEventBroadcaster.hpp> +#include <com/sun/star/accessibility/XAccessibleSelection.hpp> +#include <com/sun/star/accessibility/AccessibleEventId.hpp> +#include <com/sun/star/accessibility/AccessibleStateType.hpp> +#include <com/sun/star/accessibility/XAccessibleText.hpp> +#include <com/sun/star/lang/IndexOutOfBoundsException.hpp> +#include <cppuhelper/implbase.hxx> +#include <cppuhelper/weakref.hxx> +#include <sal/log.hxx> + +#include <vcl/svapp.hxx> +#include <vcl/window.hxx> +#include <vcl/menu.hxx> +#include <vcl/toolbox.hxx> + +#include <unx/gtk/gtkdata.hxx> +#include "atkwrapper.hxx" +#include "atkutil.hxx" + +#include <cassert> +#include <set> + +using namespace ::com::sun::star; + +namespace +{ + uno::WeakReference< accessibility::XAccessible > theNextFocusObject; +} + +static guint focus_notify_handler = 0; + +/*****************************************************************************/ + +extern "C" { + +static gboolean +atk_wrapper_focus_idle_handler (gpointer data) +{ + SolarMutexGuard aGuard; + + focus_notify_handler = 0; + + uno::Reference< accessibility::XAccessible > xAccessible = theNextFocusObject; + if( xAccessible.get() == static_cast < accessibility::XAccessible * > (data) ) + { + AtkObject *atk_obj = xAccessible.is() ? atk_object_wrapper_ref( xAccessible ) : nullptr; + // Gail does not notify focus changes to NULL, so do we .. + if( atk_obj ) + { + SAL_WNODEPRECATED_DECLARATIONS_PUSH + atk_focus_tracker_notify(atk_obj); + SAL_WNODEPRECATED_DECLARATIONS_POP + // #i93269# + // emit text_caret_moved event for <XAccessibleText> object, + // if cursor is inside the <XAccessibleText> object. + // also emit state-changed:focused event under the same condition. + { + AtkObjectWrapper* wrapper_obj = ATK_OBJECT_WRAPPER (atk_obj); + if( wrapper_obj && !wrapper_obj->mpText.is() ) + { + wrapper_obj->mpText.set(wrapper_obj->mpContext, css::uno::UNO_QUERY); + if ( wrapper_obj->mpText.is() ) + { + gint caretPos = -1; + + try { + caretPos = wrapper_obj->mpText->getCaretPosition(); + } + catch(const uno::Exception&) { + g_warning( "Exception in getCaretPosition()" ); + } + + if ( caretPos != -1 ) + { + atk_object_notify_state_change( atk_obj, ATK_STATE_FOCUSED, true ); + g_signal_emit_by_name( atk_obj, "text_caret_moved", caretPos ); + } + } + } + } + g_object_unref(atk_obj); + } + } + + return false; +} + +} // extern "C" + +/*****************************************************************************/ + +static void +atk_wrapper_focus_tracker_notify_when_idle( const uno::Reference< accessibility::XAccessible > &xAccessible ) +{ + if( focus_notify_handler ) + g_source_remove(focus_notify_handler); + + theNextFocusObject = xAccessible; + + focus_notify_handler = g_idle_add (atk_wrapper_focus_idle_handler, xAccessible.get()); +} + +/*****************************************************************************/ + +void DocumentFocusListener::disposing( const lang::EventObject& aEvent ) +{ + + // Unref the object here, but do not remove as listener since the object + // might no longer be in a state that safely allows this. + if( aEvent.Source.is() ) + m_aRefList.erase(aEvent.Source); + +} + +/*****************************************************************************/ + +void DocumentFocusListener::notifyEvent( const accessibility::AccessibleEventObject& aEvent ) +{ + try { + switch( aEvent.EventId ) + { + case accessibility::AccessibleEventId::STATE_CHANGED: + { + sal_Int16 nState = accessibility::AccessibleStateType::INVALID; + aEvent.NewValue >>= nState; + + if( accessibility::AccessibleStateType::FOCUSED == nState ) + atk_wrapper_focus_tracker_notify_when_idle( getAccessible(aEvent) ); + + break; + } + + case accessibility::AccessibleEventId::CHILD: + { + uno::Reference< accessibility::XAccessible > xChild; + if( (aEvent.OldValue >>= xChild) && xChild.is() ) + detachRecursive(xChild); + + if( (aEvent.NewValue >>= xChild) && xChild.is() ) + attachRecursive(xChild); + + break; + } + + case accessibility::AccessibleEventId::INVALIDATE_ALL_CHILDREN: + SAL_INFO("vcl.a11y", "Invalidate all children called"); + break; + + default: + break; + } + } + catch( const lang::IndexOutOfBoundsException& ) + { + g_warning("DocumentFocusListener: Focused object has invalid index in parent"); + } +} + +/*****************************************************************************/ + +uno::Reference< accessibility::XAccessible > DocumentFocusListener::getAccessible(const lang::EventObject& aEvent ) +{ + uno::Reference< accessibility::XAccessible > xAccessible(aEvent.Source, uno::UNO_QUERY); + + if( xAccessible.is() ) + return xAccessible; + + uno::Reference< accessibility::XAccessibleContext > xContext(aEvent.Source, uno::UNO_QUERY); + + if( xContext.is() ) + { + uno::Reference< accessibility::XAccessible > xParent( xContext->getAccessibleParent() ); + if( xParent.is() ) + { + uno::Reference< accessibility::XAccessibleContext > xParentContext( xParent->getAccessibleContext() ); + if( xParentContext.is() ) + { + return xParentContext->getAccessibleChild( xContext->getAccessibleIndexInParent() ); + } + } + } + + return uno::Reference< accessibility::XAccessible >(); +} + +/*****************************************************************************/ + +void DocumentFocusListener::attachRecursive( + const uno::Reference< accessibility::XAccessible >& xAccessible +) +{ + uno::Reference< accessibility::XAccessibleContext > xContext = + xAccessible->getAccessibleContext(); + + if( xContext.is() ) + attachRecursive(xAccessible, xContext); +} + +/*****************************************************************************/ + +void DocumentFocusListener::attachRecursive( + const uno::Reference< accessibility::XAccessible >& xAccessible, + const uno::Reference< accessibility::XAccessibleContext >& xContext +) +{ + uno::Reference< accessibility::XAccessibleStateSet > xStateSet = + xContext->getAccessibleStateSet(); + + if( xStateSet.is() ) + attachRecursive(xAccessible, xContext, xStateSet); +} + +/*****************************************************************************/ + +void DocumentFocusListener::attachRecursive( + const uno::Reference< accessibility::XAccessible >& xAccessible, + const uno::Reference< accessibility::XAccessibleContext >& xContext, + const uno::Reference< accessibility::XAccessibleStateSet >& xStateSet +) +{ + if( xStateSet->contains(accessibility::AccessibleStateType::FOCUSED ) ) + atk_wrapper_focus_tracker_notify_when_idle( xAccessible ); + + uno::Reference< accessibility::XAccessibleEventBroadcaster > xBroadcaster(xContext, uno::UNO_QUERY); + + if (!xBroadcaster.is()) + return; + + // If not already done, add the broadcaster to the list and attach as listener. + const uno::Reference< uno::XInterface >& xInterface = xBroadcaster; + if( !m_aRefList.insert(xInterface).second ) + return; + + xBroadcaster->addAccessibleEventListener(static_cast< accessibility::XAccessibleEventListener *>(this)); + + if( ! xStateSet->contains(accessibility::AccessibleStateType::MANAGES_DESCENDANTS ) ) + { + sal_Int32 n, nmax = xContext->getAccessibleChildCount(); + for( n = 0; n < nmax; n++ ) + { + uno::Reference< accessibility::XAccessible > xChild( xContext->getAccessibleChild( n ) ); + + if( xChild.is() ) + attachRecursive(xChild); + } + } +} + +/*****************************************************************************/ + +void DocumentFocusListener::detachRecursive( + const uno::Reference< accessibility::XAccessible >& xAccessible +) +{ + uno::Reference< accessibility::XAccessibleContext > xContext = + xAccessible->getAccessibleContext(); + + if( xContext.is() ) + detachRecursive(xContext); +} + +/*****************************************************************************/ + +void DocumentFocusListener::detachRecursive( + const uno::Reference< accessibility::XAccessibleContext >& xContext +) +{ + uno::Reference< accessibility::XAccessibleStateSet > xStateSet = + xContext->getAccessibleStateSet(); + + if( xStateSet.is() ) + detachRecursive(xContext, xStateSet); +} + +/*****************************************************************************/ + +void DocumentFocusListener::detachRecursive( + const uno::Reference< accessibility::XAccessibleContext >& xContext, + const uno::Reference< accessibility::XAccessibleStateSet >& xStateSet +) +{ + uno::Reference< accessibility::XAccessibleEventBroadcaster > xBroadcaster(xContext, uno::UNO_QUERY); + + if( !xBroadcaster.is() || 0 >= m_aRefList.erase(xBroadcaster) ) + return; + + xBroadcaster->removeAccessibleEventListener(static_cast< accessibility::XAccessibleEventListener *>(this)); + + if( ! xStateSet->contains(accessibility::AccessibleStateType::MANAGES_DESCENDANTS ) ) + { + sal_Int32 n, nmax = xContext->getAccessibleChildCount(); + for( n = 0; n < nmax; n++ ) + { + uno::Reference< accessibility::XAccessible > xChild( xContext->getAccessibleChild( n ) ); + + if( xChild.is() ) + detachRecursive(xChild); + } + } +} + +/*****************************************************************************/ + +/* + * page tabs in gtk are widgets, so we need to simulate focus events for those + */ + +static void handle_tabpage_activated(vcl::Window *pWindow) +{ + uno::Reference< accessibility::XAccessible > xAccessible = + pWindow->GetAccessible(); + + if( ! xAccessible.is() ) + return; + + uno::Reference< accessibility::XAccessibleSelection > xSelection( + xAccessible->getAccessibleContext(), uno::UNO_QUERY); + + if( xSelection.is() ) + atk_wrapper_focus_tracker_notify_when_idle( xSelection->getSelectedAccessibleChild(0) ); +} + +/*****************************************************************************/ + +/* + * toolbar items in gtk are widgets, so we need to simulate focus events for those + */ + +static void notify_toolbox_item_focus(ToolBox *pToolBox) +{ + uno::Reference< accessibility::XAccessible > xAccessible = + pToolBox->GetAccessible(); + + if( ! xAccessible.is() ) + return; + + uno::Reference< accessibility::XAccessibleContext > xContext = + xAccessible->getAccessibleContext(); + + if( ! xContext.is() ) + return; + + ToolBox::ImplToolItems::size_type nPos = pToolBox->GetItemPos( pToolBox->GetHighlightItemId() ); + if( nPos != ToolBox::ITEM_NOTFOUND ) + atk_wrapper_focus_tracker_notify_when_idle( xContext->getAccessibleChild( nPos ) ); + //TODO: ToolBox::ImplToolItems::size_type -> sal_Int32 +} + +static void handle_toolbox_highlight(vcl::Window *pWindow) +{ + ToolBox *pToolBox = static_cast <ToolBox *> (pWindow); + + // Make sure either the toolbox or its parent toolbox has the focus + if ( ! pToolBox->HasFocus() ) + { + ToolBox* pToolBoxParent = dynamic_cast< ToolBox* >( pToolBox->GetParent() ); + if ( ! pToolBoxParent || ! pToolBoxParent->HasFocus() ) + return; + } + + notify_toolbox_item_focus(pToolBox); +} + +static void handle_toolbox_highlightoff(vcl::Window const *pWindow) +{ + ToolBox* pToolBoxParent = dynamic_cast< ToolBox* >( pWindow->GetParent() ); + + // Notify when leaving sub toolboxes + if( pToolBoxParent && pToolBoxParent->HasFocus() ) + notify_toolbox_item_focus( pToolBoxParent ); +} + +/*****************************************************************************/ + +static void create_wrapper_for_child( + const uno::Reference< accessibility::XAccessibleContext >& xContext, + sal_Int32 index) +{ + if( xContext.is() ) + { + uno::Reference< accessibility::XAccessible > xChild(xContext->getAccessibleChild(index)); + if( xChild.is() ) + { + // create the wrapper object - it will survive the unref unless it is a transient object + g_object_unref( atk_object_wrapper_ref( xChild ) ); + } + } +} + +/*****************************************************************************/ + +static void handle_toolbox_buttonchange(VclWindowEvent const *pEvent) +{ + vcl::Window* pWindow = pEvent->GetWindow(); + sal_Int32 index = static_cast<sal_Int32>(reinterpret_cast<sal_IntPtr>(pEvent->GetData())); + + if( pWindow && pWindow->IsReallyVisible() ) + { + uno::Reference< accessibility::XAccessible > xAccessible(pWindow->GetAccessible()); + if( xAccessible.is() ) + { + create_wrapper_for_child(xAccessible->getAccessibleContext(), index); + } + } +} + +/*****************************************************************************/ + +namespace { + +struct WindowList { + ~WindowList() { assert(list.empty()); }; + // needs to be empty already on DeInitVCL, but at least check it's empty + // on exit + + std::set< VclPtr<vcl::Window> > list; +}; + +WindowList g_aWindowList; + +} + +DocumentFocusListener & GtkSalData::GetDocumentFocusListener() +{ + if (!m_xDocumentFocusListener) + { + m_xDocumentFocusListener = new DocumentFocusListener; + } + return *m_xDocumentFocusListener; +} + +static void handle_get_focus(::VclWindowEvent const * pEvent) +{ + GtkSalData *const pSalData(GetGtkSalData()); + assert(pSalData); + + DocumentFocusListener & rDocumentFocusListener(pSalData->GetDocumentFocusListener()); + + vcl::Window *pWindow = pEvent->GetWindow(); + + // The menu bar is handled through VclEventId::MenuHighlightED + if( ! pWindow || !pWindow->IsReallyVisible() || pWindow->GetType() == WindowType::MENUBARWINDOW ) + return; + + // ToolBoxes are handled through VclEventId::ToolboxHighlight + if( pWindow->GetType() == WindowType::TOOLBOX ) + return; + + if( pWindow->GetType() == WindowType::TABCONTROL ) + { + handle_tabpage_activated( pWindow ); + return; + } + + uno::Reference< accessibility::XAccessible > xAccessible = + pWindow->GetAccessible(); + + if( ! xAccessible.is() ) + return; + + uno::Reference< accessibility::XAccessibleContext > xContext = + xAccessible->getAccessibleContext(); + + if( ! xContext.is() ) + return; + + uno::Reference< accessibility::XAccessibleStateSet > xStateSet = + xContext->getAccessibleStateSet(); + + if( ! xStateSet.is() ) + return; + +/* the UNO ToolBox wrapper does not (yet?) support XAccessibleSelection, so we + * need to add listeners to the children instead of re-using the tabpage stuff + */ + if( xStateSet->contains(accessibility::AccessibleStateType::FOCUSED) && + ( pWindow->GetType() != WindowType::TREELISTBOX ) ) + { + atk_wrapper_focus_tracker_notify_when_idle( xAccessible ); + } + else + { + if( g_aWindowList.list.insert(pWindow).second ) + { + try + { + rDocumentFocusListener.attachRecursive(xAccessible, xContext, xStateSet); + } + catch (const uno::Exception&) + { + g_warning( "Exception caught processing focus events" ); + } + } + } +} + +/*****************************************************************************/ + +static void handle_menu_highlighted(::VclMenuEvent const * pEvent) +{ + try + { + Menu* pMenu = pEvent->GetMenu(); + sal_uInt16 nPos = pEvent->GetItemPos(); + + if( pMenu && nPos != 0xFFFF) + { + uno::Reference< accessibility::XAccessible > xAccessible ( pMenu->GetAccessible() ); + + if( xAccessible.is() ) + { + uno::Reference< accessibility::XAccessibleContext > xContext ( xAccessible->getAccessibleContext() ); + + if( xContext.is() ) + atk_wrapper_focus_tracker_notify_when_idle( xContext->getAccessibleChild( nPos ) ); + } + } + } + catch (const uno::Exception&) + { + g_warning( "Exception caught processing menu highlight events" ); + } +} + +/*****************************************************************************/ + +static void WindowEventHandler(void *, VclSimpleEvent& rEvent) +{ + try + { + switch (rEvent.GetId()) + { + case VclEventId::WindowShow: + break; + case VclEventId::WindowHide: + break; + case VclEventId::WindowClose: + break; + case VclEventId::WindowGetFocus: + handle_get_focus(static_cast< ::VclWindowEvent const * >(&rEvent)); + break; + case VclEventId::WindowLoseFocus: + break; + case VclEventId::WindowMinimize: + break; + case VclEventId::WindowNormalize: + break; + case VclEventId::WindowKeyInput: + case VclEventId::WindowKeyUp: + case VclEventId::WindowCommand: + case VclEventId::WindowMouseMove: + break; + + case VclEventId::MenuHighlight: + if (const VclMenuEvent* pMenuEvent = dynamic_cast<const VclMenuEvent*>(&rEvent)) + { + handle_menu_highlighted(pMenuEvent); + } + break; + + case VclEventId::ToolboxHighlight: + handle_toolbox_highlight(static_cast< ::VclWindowEvent const * >(&rEvent)->GetWindow()); + break; + + case VclEventId::ToolboxButtonStateChanged: + handle_toolbox_buttonchange(static_cast< ::VclWindowEvent const * >(&rEvent)); + break; + + case VclEventId::ObjectDying: + g_aWindowList.list.erase( static_cast< ::VclWindowEvent const * >(&rEvent)->GetWindow() ); + [[fallthrough]]; + case VclEventId::ToolboxHighlightOff: + handle_toolbox_highlightoff(static_cast< ::VclWindowEvent const * >(&rEvent)->GetWindow()); + break; + + case VclEventId::TabpageActivate: + handle_tabpage_activated(static_cast< ::VclWindowEvent const * >(&rEvent)->GetWindow()); + break; + + case VclEventId::ComboboxSetText: + // This looks quite strange to me. Stumbled over this when fixing #i104290#. + // This kicked in when leaving the combobox in the toolbar, after that the events worked. + // I guess this was a try to work around missing combobox events, which didn't do the full job, and shouldn't be necessary anymore. + // Fix for #i104290# was done in toolkit/source/awt/vclxaccessiblecomponent, FOCUSED state for compound controls in general. + // create_wrapper_for_children(static_cast< ::VclWindowEvent const * >(pEvent)->GetWindow()); + break; + + default: + break; + } + } + catch (const lang::IndexOutOfBoundsException&) + { + g_warning("WindowEventHandler: Focused object has invalid index in parent"); + } +} + +static Link<VclSimpleEvent&,void> g_aEventListenerLink( nullptr, WindowEventHandler ); + +/*****************************************************************************/ + +void ooo_atk_util_ensure_event_listener() +{ + static bool bInited; + if (!bInited) + { + Application::AddEventListener( g_aEventListenerLink ); + bInited = true; + } +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |