1 #ifndef DALI_TOOLKIT_CONTROL_H
2 #define DALI_TOOLKIT_CONTROL_H
5 * Copyright (c) 2019 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
22 #include <dali/public-api/actors/custom-actor.h>
23 #include <dali-toolkit/public-api/dali-toolkit-common.h>
24 #include <dali/public-api/events/long-press-gesture-detector.h>
25 #include <dali/public-api/events/pan-gesture-detector.h>
26 #include <dali/public-api/events/pinch-gesture-detector.h>
27 #include <dali/public-api/events/tap-gesture-detector.h>
28 #include <dali/public-api/events/tap-gesture-detector.h>
29 #include <dali/public-api/images/image.h>
30 #include <dali/public-api/adaptor-framework/accessibility.h>
33 #include <dali-toolkit/public-api/visuals/visual-properties.h>
41 //Forward declarations.
48 * @addtogroup dali_toolkit_controls
53 * @brief Control is the base class for all controls.
55 * The implementation of the control must be supplied; see Internal::Control for more details.
57 * @see Internal::Control
60 * | %Signal Name | Method |
61 * |------------------------|-----------------------------------------------------|
62 * | keyEvent | @ref KeyEventSignal() |
63 * | keyInputFocusGained | @ref KeyInputFocusGainedSignal() |
64 * | keyInputFocusLost | @ref KeyInputFocusLostSignal() |
65 * | resourceReady | @ref ResourceReadySignal() |
66 * | tapped | @ref GetTapGestureDetector().DetectedSignal() |
67 * | panned | @ref GetPanGestureDetector().DetectedSignal() |
68 * | pinched | @ref GetPinchGestureDetector().DetectedSignal() |
69 * | longPressed | @ref GetLongPressGestureDetector().DetectedSignal() |
72 * | %Action Name | %Control method called |
73 * |------------------------|----------------------------------------------------|
74 * | accessibilityActivated | %OnAccessibilityActivated() |
76 class DALI_TOOLKIT_API Control : public CustomActor
81 * @brief Enumeration for the start and end property ranges for control.
86 PROPERTY_START_INDEX = PROPERTY_REGISTRATION_START_INDEX, ///< Start index is used by the property registration macro. @SINCE_1_0.0
87 CONTROL_PROPERTY_START_INDEX = PROPERTY_START_INDEX, ///< Start index of Control properties. @SINCE_1_0.0
88 CONTROL_PROPERTY_END_INDEX = CONTROL_PROPERTY_START_INDEX + 1000 ///< Reserving 1000 property indices. @SINCE_1_0.0
92 * @brief Enumeration for the instance of properties belonging to the Control class.
98 * @brief Enumeration for the instance of properties belonging to the Control class.
104 * @brief The name of the style to be applied to the control.
105 * @details Name "styleName", type Property::STRING.
106 * @see Toolkit::Control::SetStyleName()
109 STYLE_NAME = PROPERTY_START_INDEX,
111 RESERVED_PROPERTY_01, ///< Reserved index for a removed property.
112 RESERVED_PROPERTY_02, ///< Reserved index for a removed property.
115 * @brief Receives key events to the control.
116 * @details Name "keyInputFocus", type Property::BOOLEAN.
117 * @see Toolkit::Control::SetKeyInputFocus()
123 * @brief The background of the control.
125 * @details Name "background", type Property::MAP or std::string for URL or Property::VECTOR4 for Color.
131 * @brief The outer space around the control.
132 * @details Name "margin", type Property::EXTENTS.
134 * @note Margin property is to be supported by Layout algorithms and containers in future.
139 * @brief The inner space of the control.
140 * @details Name "padding", type Property::EXTENTS.
148 * @brief Describes the direction to move the keyboard focus towards.
154 * @brief Keyboard focus direction.
159 LEFT, ///< Move keyboard focus towards the left direction @SINCE_1_0.0
160 RIGHT, ///< Move keyboard focus towards the right direction @SINCE_1_0.0
161 UP, ///< Move keyboard focus towards the up direction @SINCE_1_0.0
162 DOWN, ///< Move keyboard focus towards the down direction @SINCE_1_0.0
163 PAGE_UP, ///< Move keyboard focus towards the previous page direction @SINCE_1_2.14
164 PAGE_DOWN ///< Move keyboard focus towards the next page direction @SINCE_1_2.14
170 /// @brief Key Event signal type. @SINCE_1_0.0
171 typedef Signal<bool ( Control, const KeyEvent& ) > KeyEventSignalType;
173 /// @brief Key InputFocusType signal type. @SINCE_1_0.0
174 typedef Signal<void ( Control ) > KeyInputFocusSignalType;
176 /// @brief ResourceReady signal type. @SINCE_1_2.60
177 typedef Signal<void ( Control ) > ResourceReadySignalType;
179 /// @brief AccessibilityActivate signal type.
180 typedef Signal< void ( ) > AccessibilityActivateSignalType;
182 /// @brief AccessibilityReadingSkipped signal type.
183 typedef Signal< void ( ) > AccessibilityReadingSkippedSignalType;
185 /// @brief AccessibilityReadingCancelled signal type.
186 typedef Signal< void ( ) > AccessibilityReadingCancelledSignalType;
188 /// @brief AccessibilityReadingStopped signal type.
189 typedef Signal< void ( ) > AccessibilityReadingStoppedSignalType;
191 /// @brief AccessibilityGetName signal type.
192 typedef Signal< void ( std::string& ) > AccessibilityGetNameSignalType;
194 /// @brief AccessibilityGetDescription signal type.
195 typedef Signal< void ( std::string& ) > AccessibilityGetDescriptionSignalType;
197 /// @brief AccessibilityDoGesture signal type.
198 typedef Signal< void ( std::pair<Dali::Accessibility::GestureInfo, bool>& ) > AccessibilityDoGestureSignalType;
200 using RelationsCollection = std::vector<std::vector<Accessibility::Address>>;
202 public: // Creation & Destruction
205 * @brief Creates a new instance of a Control.
208 * @return A handle to a new Control
210 static Control New();
213 * @brief Creates an uninitialized Control handle.
215 * Only derived versions can be instantiated. Calling member
216 * functions with an uninitialized Dali::Object is not allowed.
222 * @brief Copy constructor.
224 * Creates another handle that points to the same real object.
226 * @param[in] uiControl Handle to copy
228 Control(const Control& uiControl);
231 * @brief Dali::Control is intended as a base class.
233 * This is non-virtual since derived Handle types must not contain data or virtual methods.
241 * @brief Assignment operator.
243 * Changes this handle to point to another real object.
245 * @param[in] handle Object to assign this to
246 * @return Reference to this
248 Control& operator=( const Control& handle );
253 * @brief Downcasts a handle to Control handle.
255 * If handle points to a Control, the downcast produces valid handle.
256 * If not, the returned handle is left uninitialized.
259 * @param[in] handle Handle to an object
260 * @return A handle to a Control or an uninitialized handle
262 static Control DownCast( BaseHandle handle );
267 * @brief This sets the control to receive key events.
269 * The key event can originate from a virtual or physical keyboard.
271 * @pre The Control has been initialized.
272 * @pre The Control should be on the stage before setting keyboard focus.
274 void SetKeyInputFocus();
277 * @brief Quries whether the control has key input focus.
280 * @return true if this control has keyboard input focus
281 * @pre The Control has been initialized.
282 * @pre The Control should be on the stage before setting keyboard focus.
283 * @note The control can be set to have the focus and still not receive all the key events if another control has over ridden it.
284 * As the key input focus mechanism works like a stack, the top most control receives all the key events, and passes on the
285 * unhandled events to the controls below in the stack. A control in the stack will regain key input focus when there are no more
286 * controls above it in the focus stack.
287 * To query for the control which is on top of the focus stack use Dali::Toolkit::KeyInputFocusManager::GetCurrentKeyboardFocusActor().
289 bool HasKeyInputFocus();
292 * @brief Once an actor is Set to receive key input focus this function is called to stop it receiving key events.
294 * A check is performed to ensure it was previously set, if this check fails then nothing is done.
296 * @pre The Actor has been initialized.
298 void ClearKeyInputFocus();
303 * @brief Retrieves the pinch gesture detector of the control.
306 * @return The pinch gesture detector
307 * @note Will return an empty handle if the control does not handle the gesture itself.
309 PinchGestureDetector GetPinchGestureDetector() const;
312 * @brief Retrieves the pan gesture detector of the control.
315 * @return The pan gesture detector
316 * @note Will return an empty handle if the control does not handle the gesture itself.
318 PanGestureDetector GetPanGestureDetector() const;
321 * @brief Retrieves the tap gesture detector of the control.
324 * @return The tap gesture detector
325 * @note Will return an empty handle if the control does not handle the gesture itself.
327 TapGestureDetector GetTapGestureDetector() const;
330 * @brief Retrieves the long press gesture detector of the control.
333 * @return The long press gesture detector
334 * @note Will return an empty handle if the control does not handle the gesture itself.
336 LongPressGestureDetector GetLongPressGestureDetector() const;
341 * @brief Sets the name of the style to be applied to the control.
344 * @param[in] styleName A string matching a style described in a stylesheet
346 void SetStyleName( const std::string& styleName );
349 * @brief Retrieves the name of the style to be applied to the control (if any).
351 * @return A string matching a style, or an empty string
353 const std::string& GetStyleName() const;
358 * @brief Sets the background color of the control.
361 * @param[in] color The required background color of the control
363 * @note If SetBackgroundImage is called later, this background color is removed.
365 * @note The background color fully blends with the actor color.
367 void SetBackgroundColor( const Vector4& color );
370 * @brief Clears the background.
373 void ClearBackground();
378 * @brief Query if all resources required by a control are loaded and ready.
380 * Most resources are only loaded when the control is placed on stage.
382 * @return true if the resources are loaded and ready, false otherwise
384 bool IsResourceReady() const;
387 * @brief Get the loading state of the visual resource.
390 * @param[in] index The Property index of the visual
391 * @return Return the loading status (PREPARING, READY and FAILED) of visual resource
393 Visual::ResourceStatus GetVisualResourceStatus( const Dali::Property::Index index );
398 * @brief This signal is emitted when key event is received.
400 * A callback of the following type may be connected:
402 * bool YourCallbackName(Control control, const KeyEvent& event);
404 * The return value of True, indicates that the event should be consumed.
405 * Otherwise the signal will be emitted on the next parent of the actor.
407 * @return The signal to connect to
408 * @pre The Control has been initialized.
410 KeyEventSignalType& KeyEventSignal();
413 * @brief This signal is emitted when the control gets Key Input Focus.
415 * A callback of the following type may be connected:
417 * bool YourCallbackName( Control control );
419 * The return value of True, indicates that the event should be consumed.
420 * Otherwise the signal will be emitted on the next parent of the actor.
422 * @return The signal to connect to
423 * @pre The Control has been initialized.
425 KeyInputFocusSignalType& KeyInputFocusGainedSignal();
428 * @brief This signal is emitted when the control loses Key Input Focus.
430 * This could be due to it being gained by another Control or Actor or just cleared from
431 * this control as no longer required.
433 * A callback of the following type may be connected:
435 * bool YourCallbackName( Control control );
437 * The return value of True, indicates that the event should be consumed.
438 * Otherwise the signal will be emitted on the next parent of the actor.
440 * @return The signal to connect to
441 * @pre The Control has been initialized.
443 KeyInputFocusSignalType& KeyInputFocusLostSignal();
446 * @brief This signal is emitted after all resources required by a control are loaded and ready.
448 * Most resources are only loaded when the control is placed on stage.
450 * If resources are shared between ImageViews, they are cached.
451 * In this case, the ResourceReady signal may be sent before there is an object to connect to.
452 * To protect against this, IsResourceReady() can be checked first.
455 * auto newControl = Control::New();
456 * newControl.SetResource( resourceUrl );
457 * if ( newControl.IsResourceReady() )
463 * newControl.ResourceReadySignal.Connect( .... )
467 * A callback of the following type may be connected:
469 * void YourCallbackName( Control control );
473 * @return The signal to connect to
474 * @note A RelayoutRequest is queued by Control before this signal is emitted
476 ResourceReadySignalType& ResourceReadySignal();
477 public: // Intended for control developers
480 * @brief Creates an initialized Control.
483 * @param[in] implementation The implementation for this control
484 * @return A handle to a newly allocated Dali resource
485 * @note Should NOT be called to create a handle from the implementation. As stated, this allocates a NEW Dali resource.
487 explicit Control(Internal::Control& implementation);
490 * @brief This constructor is used by CustomActor within Dali core to create additional Control handles
491 * using an Internal CustomActor pointer.
494 * @param[in] internal A pointer to a newly allocated Dali resource
496 explicit Control(Dali::Internal::CustomActor* internal);
498 public: // Templates for Deriving Classes
501 * @brief Template to allow deriving controls to DownCast handles to deriving handle classes.
503 * @tparam T The handle class
504 * @tparam I The implementation class
506 * @param[in] handle Handle to an object
507 * @return Handle to a class T or an uninitialized handle
508 * @see DownCast(BaseHandle)
510 template<typename T, typename I>
511 DALI_INTERNAL static T DownCast( BaseHandle handle )
515 CustomActor custom = Dali::CustomActor::DownCast( handle );
518 CustomActorImpl& customImpl = custom.GetImplementation();
520 I* impl = dynamic_cast<I*>(&customImpl);
524 result = T(customImpl.GetOwner());
532 * @brief Template to allow deriving controls to verify whether the Internal::CustomActor* is actually an
533 * implementation of their class.
535 * @tparam I The implementation class
537 * @param[in] internal Pointer to the Internal::CustomActor
540 DALI_INTERNAL void VerifyCustomActorPointer(Dali::Internal::CustomActor* internal)
542 // Can have a NULL pointer so we only need to check if the internal implementation is our class
543 // when there is a value.
546 DALI_ASSERT_DEBUG(dynamic_cast<I*>(&CustomActor(internal).GetImplementation()));
554 } // namespace Toolkit
558 #endif // DALI_TOOLKIT_CONTROL_H