1 #ifndef DALI_TOOLKIT_CONTROL_H
2 #define DALI_TOOLKIT_CONTROL_H
5 * Copyright (c) 2020 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>
31 #include <dali-toolkit/public-api/visuals/visual-properties.h>
39 //Forward declarations.
46 * @addtogroup dali_toolkit_controls
51 * @brief Control is the base class for all controls.
53 * The implementation of the control must be supplied; see Internal::Control for more details.
55 * @see Internal::Control
58 * | %Signal Name | Method |
59 * |------------------------|-----------------------------------------------------|
60 * | keyEvent | @ref KeyEventSignal() |
61 * | keyInputFocusGained | @ref KeyInputFocusGainedSignal() |
62 * | keyInputFocusLost | @ref KeyInputFocusLostSignal() |
63 * | resourceReady | @ref ResourceReadySignal() |
64 * | tapped | @ref GetTapGestureDetector().DetectedSignal() |
65 * | panned | @ref GetPanGestureDetector().DetectedSignal() |
66 * | pinched | @ref GetPinchGestureDetector().DetectedSignal() |
67 * | longPressed | @ref GetLongPressGestureDetector().DetectedSignal() |
70 * | %Action Name | %Control method called |
71 * |------------------------|----------------------------------------------------|
72 * | accessibilityActivated | %OnAccessibilityActivated() |
74 class DALI_TOOLKIT_API Control : public CustomActor
79 * @brief Enumeration for the start and end property ranges for control.
84 PROPERTY_START_INDEX = PROPERTY_REGISTRATION_START_INDEX, ///< Start index is used by the property registration macro. @SINCE_1_0.0
85 CONTROL_PROPERTY_START_INDEX = PROPERTY_START_INDEX, ///< Start index of Control properties. @SINCE_1_0.0
86 CONTROL_PROPERTY_END_INDEX = CONTROL_PROPERTY_START_INDEX + 1000 ///< Reserving 1000 property indices. @SINCE_1_0.0
90 * @brief Enumeration for the instance of properties belonging to the Control class.
96 * @brief Enumeration for the instance of properties belonging to the Control class.
102 * @brief The name of the style to be applied to the control.
103 * @details Name "styleName", type Property::STRING.
104 * @see Toolkit::Control::SetStyleName()
107 STYLE_NAME = PROPERTY_START_INDEX,
109 RESERVED_PROPERTY_01, ///< Reserved index for a removed property.
110 RESERVED_PROPERTY_02, ///< Reserved index for a removed property.
113 * @brief Receives key events to the control.
114 * @details Name "keyInputFocus", type Property::BOOLEAN.
115 * @see Toolkit::Control::SetKeyInputFocus()
121 * @brief The background of the control.
123 * @details Name "background", type Property::MAP or std::string for URL or Property::VECTOR4 for Color.
129 * @brief The outer space around the control.
130 * @details Name "margin", type Property::EXTENTS.
132 * @note Margin property is to be supported by Layout algorithms and containers in future.
137 * @brief The inner space of the control.
138 * @details Name "padding", type Property::EXTENTS.
146 * @brief Describes the direction to move the keyboard focus towards.
152 * @brief Keyboard focus direction.
157 LEFT, ///< Move keyboard focus towards the left direction @SINCE_1_0.0
158 RIGHT, ///< Move keyboard focus towards the right direction @SINCE_1_0.0
159 UP, ///< Move keyboard focus towards the up direction @SINCE_1_0.0
160 DOWN, ///< Move keyboard focus towards the down direction @SINCE_1_0.0
161 PAGE_UP, ///< Move keyboard focus towards the previous page direction @SINCE_1_2.14
162 PAGE_DOWN ///< Move keyboard focus towards the next page direction @SINCE_1_2.14
168 /// @brief Key Event signal type. @SINCE_1_0.0
169 typedef Signal<bool ( Control, const KeyEvent& ) > KeyEventSignalType;
171 /// @brief Key InputFocusType signal type. @SINCE_1_0.0
172 typedef Signal<void ( Control ) > KeyInputFocusSignalType;
174 /// @brief ResourceReady signal type. @SINCE_1_2.60
175 typedef Signal<void ( Control ) > ResourceReadySignalType;
177 public: // Creation & Destruction
180 * @brief Creates a new instance of a Control.
183 * @return A handle to a new Control
185 static Control New();
188 * @brief Creates an uninitialized Control handle.
190 * Only derived versions can be instantiated. Calling member
191 * functions with an uninitialized Dali::Object is not allowed.
197 * @brief Copy constructor.
199 * Creates another handle that points to the same real object.
201 * @param[in] uiControl Handle to copy
203 Control(const Control& uiControl);
206 * @brief Dali::Control is intended as a base class.
208 * This is non-virtual since derived Handle types must not contain data or virtual methods.
216 * @brief Assignment operator.
218 * Changes this handle to point to another real object.
220 * @param[in] handle Object to assign this to
221 * @return Reference to this
223 Control& operator=( const Control& handle );
228 * @brief Downcasts a handle to Control handle.
230 * If handle points to a Control, the downcast produces valid handle.
231 * If not, the returned handle is left uninitialized.
234 * @param[in] handle Handle to an object
235 * @return A handle to a Control or an uninitialized handle
237 static Control DownCast( BaseHandle handle );
242 * @brief This sets the control to receive key events.
244 * The key event can originate from a virtual or physical keyboard.
246 * @pre The Control has been initialized.
247 * @pre The Control should be on the stage before setting keyboard focus.
249 void SetKeyInputFocus();
252 * @brief Quries whether the control has key input focus.
255 * @return true if this control has keyboard input focus
256 * @pre The Control has been initialized.
257 * @pre The Control should be on the stage before setting keyboard focus.
258 * @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.
259 * As the key input focus mechanism works like a stack, the top most control receives all the key events, and passes on the
260 * unhandled events to the controls below in the stack. A control in the stack will regain key input focus when there are no more
261 * controls above it in the focus stack.
262 * To query for the control which is on top of the focus stack use Dali::Toolkit::KeyInputFocusManager::GetCurrentKeyboardFocusActor().
264 bool HasKeyInputFocus();
267 * @brief Once an actor is Set to receive key input focus this function is called to stop it receiving key events.
269 * A check is performed to ensure it was previously set, if this check fails then nothing is done.
271 * @pre The Actor has been initialized.
273 void ClearKeyInputFocus();
278 * @brief Retrieves the pinch gesture detector of the control.
281 * @return The pinch gesture detector
282 * @note Will return an empty handle if the control does not handle the gesture itself.
284 PinchGestureDetector GetPinchGestureDetector() const;
287 * @brief Retrieves the pan gesture detector of the control.
290 * @return The pan gesture detector
291 * @note Will return an empty handle if the control does not handle the gesture itself.
293 PanGestureDetector GetPanGestureDetector() const;
296 * @brief Retrieves the tap gesture detector of the control.
299 * @return The tap gesture detector
300 * @note Will return an empty handle if the control does not handle the gesture itself.
302 TapGestureDetector GetTapGestureDetector() const;
305 * @brief Retrieves the long press gesture detector of the control.
308 * @return The long press gesture detector
309 * @note Will return an empty handle if the control does not handle the gesture itself.
311 LongPressGestureDetector GetLongPressGestureDetector() const;
316 * @brief Sets the name of the style to be applied to the control.
319 * @param[in] styleName A string matching a style described in a stylesheet
321 void SetStyleName( const std::string& styleName );
324 * @brief Retrieves the name of the style to be applied to the control (if any).
326 * @return A string matching a style, or an empty string
328 const std::string& GetStyleName() const;
333 * @brief Sets the background color of the control.
336 * @param[in] color The required background color of the control
338 * @note If SetBackgroundImage is called later, this background color is removed.
340 * @note The background color fully blends with the actor color.
342 void SetBackgroundColor( const Vector4& color );
345 * @brief Clears the background.
348 void ClearBackground();
353 * @brief Query if all resources required by a control are loaded and ready.
355 * Most resources are only loaded when the control is placed on stage.
357 * @return true if the resources are loaded and ready, false otherwise
359 bool IsResourceReady() const;
362 * @brief Get the loading state of the visual resource.
365 * @param[in] index The Property index of the visual
366 * @return Return the loading status (PREPARING, READY and FAILED) of visual resource
368 Visual::ResourceStatus GetVisualResourceStatus( const Dali::Property::Index index );
373 * @brief This signal is emitted when key event is received.
375 * A callback of the following type may be connected:
377 * bool YourCallbackName(Control control, const KeyEvent& event);
379 * The return value of True, indicates that the event should be consumed.
380 * Otherwise the signal will be emitted on the next parent of the actor.
382 * @return The signal to connect to
383 * @pre The Control has been initialized.
385 KeyEventSignalType& KeyEventSignal();
388 * @brief This signal is emitted when the control gets Key Input Focus.
390 * A callback of the following type may be connected:
392 * bool YourCallbackName( Control control );
394 * The return value of True, indicates that the event should be consumed.
395 * Otherwise the signal will be emitted on the next parent of the actor.
397 * @return The signal to connect to
398 * @pre The Control has been initialized.
400 KeyInputFocusSignalType& KeyInputFocusGainedSignal();
403 * @brief This signal is emitted when the control loses Key Input Focus.
405 * This could be due to it being gained by another Control or Actor or just cleared from
406 * this control as no longer required.
408 * A callback of the following type may be connected:
410 * bool YourCallbackName( Control control );
412 * The return value of True, indicates that the event should be consumed.
413 * Otherwise the signal will be emitted on the next parent of the actor.
415 * @return The signal to connect to
416 * @pre The Control has been initialized.
418 KeyInputFocusSignalType& KeyInputFocusLostSignal();
421 * @brief This signal is emitted after all resources required by a control are loaded and ready.
423 * Most resources are only loaded when the control is placed on stage.
425 * If resources are shared between ImageViews, they are cached.
426 * In this case, the ResourceReady signal may be sent before there is an object to connect to.
427 * To protect against this, IsResourceReady() can be checked first.
430 * auto newControl = Control::New();
431 * newControl.SetResource( resourceUrl );
432 * if ( newControl.IsResourceReady() )
438 * newControl.ResourceReadySignal.Connect( .... )
442 * A callback of the following type may be connected:
444 * void YourCallbackName( Control control );
448 * @return The signal to connect to
449 * @note A RelayoutRequest is queued by Control before this signal is emitted
451 ResourceReadySignalType& ResourceReadySignal();
453 public: // Intended for control developers
456 * @brief Creates an initialized Control.
459 * @param[in] implementation The implementation for this control
460 * @return A handle to a newly allocated Dali resource
461 * @note Should NOT be called to create a handle from the implementation. As stated, this allocates a NEW Dali resource.
463 explicit Control(Internal::Control& implementation);
466 * @brief This constructor is used by CustomActor within Dali core to create additional Control handles
467 * using an Internal CustomActor pointer.
470 * @param[in] internal A pointer to a newly allocated Dali resource
472 explicit Control(Dali::Internal::CustomActor* internal);
474 public: // Templates for Deriving Classes
477 * @brief Template to allow deriving controls to DownCast handles to deriving handle classes.
479 * @tparam T The handle class
480 * @tparam I The implementation class
482 * @param[in] handle Handle to an object
483 * @return Handle to a class T or an uninitialized handle
484 * @see DownCast(BaseHandle)
486 template<typename T, typename I>
487 DALI_INTERNAL static T DownCast( BaseHandle handle )
491 CustomActor custom = Dali::CustomActor::DownCast( handle );
494 CustomActorImpl& customImpl = custom.GetImplementation();
496 I* impl = dynamic_cast<I*>(&customImpl);
500 result = T(customImpl.GetOwner());
508 * @brief Template to allow deriving controls to verify whether the Internal::CustomActor* is actually an
509 * implementation of their class.
511 * @tparam I The implementation class
513 * @param[in] internal Pointer to the Internal::CustomActor
516 DALI_INTERNAL void VerifyCustomActorPointer(Dali::Internal::CustomActor* internal)
518 // Can have a NULL pointer so we only need to check if the internal implementation is our class
519 // when there is a value.
522 DALI_ASSERT_DEBUG(dynamic_cast<I*>(&CustomActor(internal).GetImplementation()));
531 } // namespace Toolkit
535 #endif // DALI_TOOLKIT_CONTROL_H