Quelle AccessibleContextBase.hxx Sprache: C

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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*
* This file incorporates work covered by the following license notice:
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*   Licensed to the Apache Software Foundation (ASF) under one or more
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#pragma once

#include <com/sun/star/accessibility/XAccessible.hpp>
#include <com/sun/star/uno/Reference.hxx>
#include <com/sun/star/lang/XServiceInfo.hpp>
#include <comphelper/accessiblecomponenthelper.hxx>
#include <cppuhelper/compbase.hxx>
#include <cppuhelper/basemutex.hxx>
#include <editeng/editengdllapi.h>
#include <rtl/ref.hxx>

namespace utl { class AccessibleRelationSetHelper; }

namespace accessibility {

class EDITENG_DLLPUBLIC AccessibleContextBase
    : public cppu::ImplInheritanceHelper<comphelper::OAccessibleComponentHelper,
                                         css::lang::XServiceInfo, css::accessibility::XAccessible>
{
public:

    //=====  internal  ========================================================

    /** The origin of the accessible name or description.
    */
    enum StringOrigin {
        ManuallySet,
        FromShape,
        AutomaticallyCreated,
        NotSet
    };

    AccessibleContextBase (
        css::uno::Reference< css::accessibility::XAccessible> xParent,
        const sal_Int16 aRole);
    virtual ~AccessibleContextBase() override;

    /** Call all accessibility event listeners to inform them about the
        specified event.
        @param aEventId
            Id of the event type.
        @param rNewValue
            New value of the modified attribute.  Pass empty structure if
            not applicable.
        @param rOldValue
            Old value of the modified attribute.  Pass empty structure if
            not applicable.
    */
    void CommitChange (sal_Int16 aEventId,
        const css::uno::Any& rNewValue,
        const css::uno::Any& rOldValue,
        sal_Int32 nValueIndex);

    /** Set a new description and, provided that the new name differs from
        the old one, broadcast an accessibility event.
        @param rsDescription
            The new description.
        @param eDescriptionOrigin
            The origin of the description.  This is used to determine
            whether the given description overrules the existing one.  An
            origin with a lower numerical value overrides one with a higher
            value.
        @throws css::uno::RuntimeException
    */
    void SetAccessibleDescription (
        const OUString& rsDescription,
        StringOrigin eDescriptionOrigin);

    /** Set a new description and, provided that the new name differs from
        the old one, broadcast an accessibility event.
        @param rsName
            The new name.
        @param eNameOrigin
            The origin of the name.  This is used to determine whether the
            given name overrules the existing one.  An origin with a lower
            numerical value overrides one with a higher value.
        @throws css::uno::RuntimeException
    */
    void SetAccessibleName (
        const OUString& rsName,
        StringOrigin eNameOrigin);

    /** Set the specified state (turn it on) and send events to all
        listeners to inform them of the change.

        @param aState
            The state to turn on.

        @return
            If the specified state changed its value due to this call
            <TRUE/> is returned, otherwise <FALSE/>.
    */
    virtual bool SetState (sal_Int64 aState);

    /** Reset the specified state (turn it off) and send events to all
        listeners to inform them of the change.

        @param aState
            The state to turn off.

        @return
            If the specified state changed its value due to this call
            <TRUE/> is returned, otherwise <FALSE/>.
    */
    virtual bool ResetState (sal_Int64 aState);

    /** Return the state of the specified state.

        @param aState
            The state for which to return its value.

        @return
            A value of <TRUE/> indicates that the state is set.  A <FALSE/>
            value indicates an unset state.
    */
    bool GetState (sal_Int64 aState);

    /** Replace the current relation set with the specified one.  Send
        events for relations that are not in both sets.

        @param rRelationSet
            The new relation set that replaces the old one.

        @throws css::uno::RuntimeException
    */
    void SetRelationSet (
        const rtl::Reference< utl::AccessibleRelationSetHelper>& rxRelationSet);

    //=====  XAccessible  =====================================================

    /// Return the XAccessibleContext.
    virtual css::uno::Reference< css::accessibility::XAccessibleContext> SAL_CALL
        getAccessibleContext() override;

    //=====  XAccessibleContext  ==============================================

    /// Return the number of currently visible children.
    virtual sal_Int64 SAL_CALL
        getAccessibleChildCount() override;

    /// Return the specified child or throw exception.
    virtual css::uno::Reference< css::accessibility::XAccessible> SAL_CALL
        getAccessibleChild (sal_Int64 nIndex) override;

    /// Return a reference to the parent.
    virtual css::uno::Reference< css::accessibility::XAccessible> SAL_CALL
        getAccessibleParent() override;

    /// Return this object's role.
    virtual sal_Int16 SAL_CALL
        getAccessibleRole() override;

    /// Return this object's description.
    virtual OUString SAL_CALL
        getAccessibleDescription() override;

    /// Return the object's current name.
    virtual OUString SAL_CALL
        getAccessibleName() override;

    /// Return NULL to indicate that an empty relation set.
    virtual css::uno::Reference< css::accessibility::XAccessibleRelationSet> SAL_CALL
        getAccessibleRelationSet() override;

    /// Return the set of current states.
    virtual sal_Int64 SAL_CALL getAccessibleStateSet() override;

    /** Return the parents locale or throw exception if this object has no
        parent yet/anymore.
    */
    virtual css::lang::Locale SAL_CALL
        getLocale() override;

    //=====  XAccessibleComponent  ================================================

    /** The default implementation returns an empty reference.
    */
    virtual css::uno::Reference<css::accessibility::XAccessible>
        SAL_CALL getAccessibleAtPoint(const css::awt::Point& aPoint) override;

    /** The default implementation does nothing.
    */
    virtual void SAL_CALL grabFocus() override;

    /** Returns black as the default foreground color.
    */
    virtual sal_Int32 SAL_CALL getForeground() override;

    /** Returns white as the default background color.
    */
    virtual sal_Int32 SAL_CALL getBackground() override;

    //=====  XServiceInfo  ====================================================

    /** Returns an identifier for the implementation of this object.
    */
    virtual OUString SAL_CALL
        getImplementationName() override;

    /** Return whether the specified service is supported by this class.
    */
    virtual sal_Bool SAL_CALL
        supportsService (const OUString& sServiceName) override final;

    /** Returns a list of all supported services.  In this case that is just
        the AccessibleContext service.
    */
    virtual css::uno::Sequence< OUString> SAL_CALL
        getSupportedServiceNames() override;

    //=====  XTypeProvider  ===================================================

    /** Returns an implementation id.
    */
    virtual css::uno::Sequence<sal_Int8> SAL_CALL
        getImplementationId() override;

    /** Check whether or not the object has been disposed (or is in the
        state of being disposed).

        @return TRUE, if the object is disposed or in the course
        of being disposed. Otherwise, FALSE is returned.
    */
    bool IsDisposed() const;

protected:
    /** The state set.
    */
    sal_Int64 mnStateSet;

    /** The relation set.  Relations can be set or removed by calling the
        <member>AddRelation</member> and <member>RemoveRelation</member> methods.
    */
    rtl::Reference<utl::AccessibleRelationSetHelper> mxRelationSet;

    // This method is called from the component helper base class while disposing.
    virtual void SAL_CALL disposing() override;

    /** Create the accessible object's name.  This method may be called more
        than once for a single object.
        @return
            The returned string is a unique (among the accessible object's
            siblings) name.
        @throws css::uno::RuntimeException
    */
    virtual OUString CreateAccessibleName();

    /** sets the role as returned by XaccessibleContext::getAccessibleRole

        <p>Caution: This is only to be used in the construction phase (means within
        the ctor or late ctor), <em>never</em> when the object is still alive and part
        of an Accessibility hierarchy.</p>
    */
    void SetAccessibleRole( sal_Int16 _nRole );

private:
    /// Reference to the parent object.
    css::uno::Reference< css::accessibility::XAccessible> mxParent;

    /** Description of this object.  This is not a constant because it can
        be set from the outside.  Furthermore, it changes according to the
        draw page's display mode.
    */
    OUString msDescription;

    /** The origin of the description is used to determine whether new
        descriptions given to the SetAccessibleDescription is ignored or
        whether that replaces the old value in msDescription.
    */
    StringOrigin meDescriptionOrigin;

    /** Name of this object.  It changes according the draw page's
        display mode.
    */
    OUString msName;

    /** The origin of the name is used to determine whether new
        name given to the SetAccessibleName is ignored or
        whether that replaces the old value in msName.
    */
    StringOrigin meNameOrigin;

    /** This is the role of this object.
    */
    sal_Int16 maRole;
};

}

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