25bd5d8adb
subrepo: subdir: "deps/juce" merged: "b13f9084e" upstream: origin: "https://github.com/essej/JUCE.git" branch: "sono6good" commit: "b13f9084e" git-subrepo: version: "0.4.3" origin: "https://github.com/ingydotnet/git-subrepo.git" commit: "2f68596"
326 lines
13 KiB
C++
326 lines
13 KiB
C++
/*
|
|
==============================================================================
|
|
|
|
This file is part of the JUCE library.
|
|
Copyright (c) 2020 - Raw Material Software Limited
|
|
|
|
JUCE is an open source library subject to commercial or open-source
|
|
licensing.
|
|
|
|
By using JUCE, you agree to the terms of both the JUCE 6 End-User License
|
|
Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
|
|
|
|
End User License Agreement: www.juce.com/juce-6-licence
|
|
Privacy Policy: www.juce.com/juce-privacy-policy
|
|
|
|
Or: You may also use this code under the terms of the GPL v3 (see
|
|
www.gnu.org/licenses).
|
|
|
|
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
|
|
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
|
|
DISCLAIMED.
|
|
|
|
==============================================================================
|
|
*/
|
|
|
|
namespace juce
|
|
{
|
|
|
|
class AccessibilityNativeHandle;
|
|
|
|
/** Base class for accessible Components.
|
|
|
|
This class wraps a Component and provides methods that allow an accessibility client,
|
|
such as VoiceOver on macOS, or Narrator on Windows, to control it.
|
|
|
|
It handles hierarchical navigation, properties, state, and various interfaces.
|
|
|
|
@tags{Accessibility}
|
|
*/
|
|
class JUCE_API AccessibilityHandler
|
|
{
|
|
public:
|
|
/** Utility struct which holds one or more accessibility interfaces.
|
|
|
|
The main purpose of this class is to provide convenience constructors from each
|
|
of the four types of accessibility interface.
|
|
*/
|
|
struct JUCE_API Interfaces
|
|
{
|
|
Interfaces() = default;
|
|
|
|
Interfaces (std::unique_ptr<AccessibilityValueInterface> ptr) : value (std::move (ptr)) {}
|
|
Interfaces (std::unique_ptr<AccessibilityTextInterface> ptr) : text (std::move (ptr)) {}
|
|
Interfaces (std::unique_ptr<AccessibilityTableInterface> ptr) : table (std::move (ptr)) {}
|
|
Interfaces (std::unique_ptr<AccessibilityCellInterface> ptr) : cell (std::move (ptr)) {}
|
|
|
|
Interfaces (std::unique_ptr<AccessibilityValueInterface> valueIn,
|
|
std::unique_ptr<AccessibilityTextInterface> textIn,
|
|
std::unique_ptr<AccessibilityTableInterface> tableIn,
|
|
std::unique_ptr<AccessibilityCellInterface> cellIn)
|
|
: value (std::move (valueIn)),
|
|
text (std::move (textIn)),
|
|
table (std::move (tableIn)),
|
|
cell (std::move (cellIn))
|
|
{
|
|
}
|
|
|
|
std::unique_ptr<AccessibilityValueInterface> value;
|
|
std::unique_ptr<AccessibilityTextInterface> text;
|
|
std::unique_ptr<AccessibilityTableInterface> table;
|
|
std::unique_ptr<AccessibilityCellInterface> cell;
|
|
};
|
|
|
|
/** Constructor.
|
|
|
|
This will create a AccessibilityHandler which wraps the provided Component and makes
|
|
it visible to accessibility clients. You must also specify a role for the UI element
|
|
from the `AccessibilityRole` list which best describes it.
|
|
|
|
To enable users to interact with the UI element you should provide the set of supported
|
|
actions and their associated callbacks via the `accessibilityActions` parameter.
|
|
|
|
For UI elements that support more complex interaction the value, text, table, and cell
|
|
interfaces should be implemented as required and passed as the final argument of this
|
|
constructor. See the documentation of these classes for more information about the
|
|
types of control they represent and which methods need to be implemented.
|
|
*/
|
|
AccessibilityHandler (Component& componentToWrap,
|
|
AccessibilityRole accessibilityRole,
|
|
AccessibilityActions actions = {},
|
|
Interfaces interfaces = {});
|
|
|
|
/** Destructor. */
|
|
virtual ~AccessibilityHandler();
|
|
|
|
//==============================================================================
|
|
/** Returns the Component that this handler represents. */
|
|
const Component& getComponent() const noexcept { return component; }
|
|
|
|
/** Returns the Component that this handler represents. */
|
|
Component& getComponent() noexcept { return component; }
|
|
|
|
//==============================================================================
|
|
/** The type of UI element that this accessibility handler represents.
|
|
|
|
@see AccessibilityRole
|
|
*/
|
|
AccessibilityRole getRole() const noexcept { return role; }
|
|
|
|
/** The title of the UI element.
|
|
|
|
This will be read out by the system and should be concise, preferably matching
|
|
the visible title of the UI element (if any). For example, this might be the
|
|
text of a button or a simple label.
|
|
|
|
The default implementation will call `Component::getTitle()`, but you can override
|
|
this to return a different string if required.
|
|
|
|
If neither a name nor a description is provided then the UI element may be
|
|
ignored by accessibility clients.
|
|
|
|
This must be a localised string.
|
|
*/
|
|
virtual String getTitle() const { return component.getTitle(); }
|
|
|
|
/** A short description of the UI element.
|
|
|
|
This may be read out by the system. It should not include the type of the UI
|
|
element and should ideally be a single word, for example "Open" for a button
|
|
that opens a window.
|
|
|
|
The default implementation will call `Component::getDescription()`, but you
|
|
can override this to return a different string if required.
|
|
|
|
If neither a name nor a description is provided then the UI element may be
|
|
ignored by accessibility clients.
|
|
|
|
This must be a localised string.
|
|
*/
|
|
virtual String getDescription() const { return component.getDescription(); }
|
|
|
|
/** Some help text for the UI element (if required).
|
|
|
|
This may be read out by the system. This string functions in a similar way to
|
|
a tooltip, for example "Click to open window." for a button which opens a window.
|
|
|
|
The default implementation will call `Component::getHelpText()`, but you can
|
|
override this to return a different string if required.
|
|
|
|
This must be a localised string.
|
|
*/
|
|
virtual String getHelp() const { return component.getHelpText(); }
|
|
|
|
/** Returns the current state of the UI element.
|
|
|
|
The default implementation of this method will set the focusable flag and, if
|
|
this UI element is currently focused, will also set the focused flag.
|
|
*/
|
|
virtual AccessibleState getCurrentState() const;
|
|
|
|
/** Returns true if this UI element should be ignored by accessibility clients. */
|
|
bool isIgnored() const;
|
|
|
|
/** Returns true if this UI element is visible within its parent.
|
|
|
|
This will always return true for UI elements with the AccessibleState::accessibleOffscreen
|
|
flag set.
|
|
*/
|
|
bool isVisibleWithinParent() const;
|
|
|
|
//==============================================================================
|
|
/** Returns the set of actions that the UI element supports and the associated
|
|
callbacks.
|
|
*/
|
|
const AccessibilityActions& getActions() const noexcept;
|
|
|
|
/** Returns the value interface for this UI element, or nullptr if it is not supported.
|
|
|
|
@see AccessibilityValueInterface
|
|
*/
|
|
AccessibilityValueInterface* getValueInterface() const;
|
|
|
|
/** Returns the table interface for this UI element, or nullptr if it is not supported.
|
|
|
|
@see AccessibilityTableInterface
|
|
*/
|
|
AccessibilityTableInterface* getTableInterface() const;
|
|
|
|
/** Returns the cell interface for this UI element, or nullptr if it is not supported.
|
|
|
|
@see AccessibilityCellInterface
|
|
*/
|
|
AccessibilityCellInterface* getCellInterface() const;
|
|
|
|
/** Returns the text interface for this UI element, or nullptr if it is not supported.
|
|
|
|
@see AccessibilityTextInterface
|
|
*/
|
|
AccessibilityTextInterface* getTextInterface() const;
|
|
|
|
//==============================================================================
|
|
/** Returns the first unignored parent of this UI element in the accessibility hierarchy,
|
|
or nullptr if this is a root element without a parent.
|
|
*/
|
|
AccessibilityHandler* getParent() const;
|
|
|
|
/** Returns the unignored children of this UI element in the accessibility hierarchy. */
|
|
std::vector<AccessibilityHandler*> getChildren() const;
|
|
|
|
/** Checks whether a given UI element is a child of this one in the accessibility
|
|
hierarchy.
|
|
*/
|
|
bool isParentOf (const AccessibilityHandler* possibleChild) const noexcept;
|
|
|
|
/** Returns the deepest child of this UI element in the accessibility hierarchy that
|
|
contains the given screen point, or nullptr if there is no child at this point.
|
|
*/
|
|
AccessibilityHandler* getChildAt (Point<int> screenPoint);
|
|
|
|
/** Returns the deepest UI element which currently has focus.
|
|
|
|
This can be a child of this UI element or, if no child is focused,
|
|
this element itself.
|
|
|
|
Note that this can be different to the value of the Component with keyboard
|
|
focus returned by Component::getCurrentlyFocusedComponent().
|
|
|
|
@see hasFocus
|
|
*/
|
|
AccessibilityHandler* getChildFocus();
|
|
|
|
/** Returns true if this UI element has the focus.
|
|
|
|
@param trueIfChildFocused if this is true, this method will also return true
|
|
if any child of this UI element in the accessibility
|
|
hierarchy has focus
|
|
*/
|
|
bool hasFocus (bool trueIfChildFocused) const;
|
|
|
|
/** Tries to give focus to this UI element.
|
|
|
|
If the UI element is focusable and not ignored this will update the currently focused
|
|
element, try to give keyboard focus to the Component it represents, and notify any
|
|
listening accessibility clients that the current focus has changed.
|
|
|
|
@see hasFocus, giveAwayFocus
|
|
*/
|
|
void grabFocus();
|
|
|
|
/** If this UI element or any of its children in the accessibility hierarchy currently
|
|
have focus, this will defocus it.
|
|
|
|
This will also give away the keyboard focus from the Component it represents, and
|
|
notify any listening accessibility clients that the current focus has changed.
|
|
|
|
@see hasFocus, grabFocus
|
|
*/
|
|
void giveAwayFocus() const;
|
|
|
|
//==============================================================================
|
|
/** Used to send a notification to any observing accessibility clients that something
|
|
has changed in the UI element.
|
|
|
|
@see AccessibilityEvent
|
|
*/
|
|
void notifyAccessibilityEvent (AccessibilityEvent event) const;
|
|
|
|
/** A priority level that can help an accessibility client determine how to handle
|
|
an announcement request.
|
|
|
|
Exactly what this controls is platform-specific, but generally a low priority
|
|
announcement will be read when the screen reader is free, whereas a high priority
|
|
announcement will interrupt the current speech.
|
|
*/
|
|
enum class AnnouncementPriority
|
|
{
|
|
low,
|
|
medium,
|
|
high
|
|
};
|
|
|
|
/** Posts an announcement to be made to the user.
|
|
|
|
@param announcementString a localised string containing the announcement to be read out
|
|
@param priority the appropriate priority level for the announcement
|
|
*/
|
|
static void postAnnouncement (const String& announcementString, AnnouncementPriority priority);
|
|
|
|
//==============================================================================
|
|
/** @internal */
|
|
AccessibilityNativeHandle* getNativeImplementation() const;
|
|
/** @internal */
|
|
std::type_index getTypeIndex() const { return typeIndex; }
|
|
|
|
private:
|
|
//==============================================================================
|
|
friend class AccessibilityNativeHandle;
|
|
|
|
//==============================================================================
|
|
void grabFocusInternal (bool);
|
|
void giveAwayFocusInternal() const;
|
|
void takeFocus();
|
|
|
|
static AccessibilityHandler* currentlyFocusedHandler;
|
|
|
|
//==============================================================================
|
|
Component& component;
|
|
std::type_index typeIndex;
|
|
|
|
const AccessibilityRole role;
|
|
AccessibilityActions actions;
|
|
|
|
Interfaces interfaces;
|
|
|
|
//==============================================================================
|
|
class AccessibilityNativeImpl;
|
|
std::unique_ptr<AccessibilityNativeImpl> nativeImpl;
|
|
|
|
static std::unique_ptr<AccessibilityNativeImpl> createNativeImpl (AccessibilityHandler&);
|
|
|
|
//==============================================================================
|
|
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AccessibilityHandler)
|
|
};
|
|
|
|
} // namespace juce
|