1 #ifndef __DALI_TOOLKIT_CONTROL_H__
2 #define __DALI_TOOLKIT_CONTROL_H__
5 * Copyright (c) 2016 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/public-api/common/dali-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>
37 //Forward declarations.
44 * @addtogroup dali_toolkit_controls
49 * @brief Control is the base class for all controls.
51 * The implementation of the control must be supplied; see Internal::Control for more details.
53 * @see Internal::Control
56 * | %Signal Name | Method |
57 * |------------------------|-----------------------------------------------------|
58 * | keyEvent | @ref KeyEventSignal() |
59 * | keyInputFocusGained | @ref KeyInputFocusGainedSignal() |
60 * | keyInputFocusLost | @ref KeyInputFocusLostSignal() |
61 * | tapped | @ref GetTapGestureDetector().DetectedSignal() |
62 * | panned | @ref GetPanGestureDetector().DetectedSignal() |
63 * | pinched | @ref GetPinchGestureDetector().DetectedSignal() |
64 * | longPressed | @ref GetLongPressGestureDetector().DetectedSignal() |
67 * | %Action Name | %Control method called |
68 * |------------------------|----------------------------------------------------|
69 * | accessibilityActivated | %OnAccessibilityActivated() |
71 class DALI_IMPORT_API Control : public CustomActor
76 * @brief Enumeration for the start and end property ranges for control.
81 PROPERTY_START_INDEX = PROPERTY_REGISTRATION_START_INDEX, ///< Start index is used by the property registration macro. @SINCE_1_0.0
82 CONTROL_PROPERTY_START_INDEX = PROPERTY_START_INDEX, ///< Start index of Control properties. @SINCE_1_0.0
83 CONTROL_PROPERTY_END_INDEX = CONTROL_PROPERTY_START_INDEX + 1000 ///< Reserving 1000 property indices. @SINCE_1_0.0
87 * @brief Enumeration for the instance of properties belonging to the Control class.
93 * @brief Enumeration for the instance of properties belonging to the Control class.
99 * @brief name "styleName", type std::string.
103 STYLE_NAME = PROPERTY_START_INDEX,
106 * @brief name "backgroundColor", mutually exclusive with BACKGROUND_IMAGE & BACKGROUND, type Vector4.
113 * @brief name "backgroundImage", mutually exclusive with BACKGROUND_COLOR & BACKGROUND, type Map.
118 * @brief name "keyInputFocus", type bool.
120 * @see SetKeyInputFocus
124 * @brief name "background", mutually exclusive with BACKGROUND_COLOR & BACKGROUND_IMAGE, type Map or std::string for URL.
132 * @brief Describes the direction to move the keyboard focus towards.
138 * @brief Keyboard focus direction.
143 LEFT, ///< Move keyboard focus towards the left direction @SINCE_1_0.0
144 RIGHT, ///< Move keyboard focus towards the right direction @SINCE_1_0.0
145 UP, ///< Move keyboard focus towards the up direction @SINCE_1_0.0
146 DOWN, ///< Move keyboard focus towards the down direction @SINCE_1_0.0
147 PAGE_UP, ///< Move keyboard focus towards the previous page direction @SINCE_1_2.14
148 PAGE_DOWN ///< Move keyboard focus towards the next page direction @SINCE_1_2.14
154 /// @brief Key Event signal type;
155 typedef Signal<bool ( Control, const KeyEvent& ) > KeyEventSignalType;
157 /// @brief Key InputFocusType signal type;
158 typedef Signal<void ( Control ) > KeyInputFocusSignalType;
160 public: // Creation & Destruction
163 * @brief Creates a new instance of a Control.
166 * @return A handle to a new Control
168 static Control New();
171 * @brief Creates an uninitialized Control handle.
173 * Only derived versions can be instantiated. Calling member
174 * functions with an uninitialized Dali::Object is not allowed.
180 * @brief Copy constructor.
182 * Creates another handle that points to the same real object.
184 * @param[in] uiControl Handle to copy
186 Control(const Control& uiControl);
189 * @brief Dali::Control is intended as a base class.
191 * This is non-virtual since derived Handle types must not contain data or virtual methods.
199 * @brief Assignment operator.
201 * Changes this handle to point to another real object.
203 * @param[in] handle Object to assign this to
204 * @return Reference to this
206 Control& operator=( const Control& handle );
211 * @brief Downcasts a handle to Control handle.
213 * If handle points to a Control, the downcast produces valid handle.
214 * If not, the returned handle is left uninitialized.
217 * @param[in] handle Handle to an object
218 * @return A handle to a Control or an uninitialized handle
220 static Control DownCast( BaseHandle handle );
225 * @brief This sets the control to receive key events.
227 * The key event can originate from a virtual or physical keyboard.
229 * @pre The Control has been initialized.
230 * @pre The Control should be on the stage before setting keyboard focus.
232 void SetKeyInputFocus();
235 * @brief Quries whether the control has key input focus.
238 * @return true if this control has keyboard input focus
239 * @pre The Control has been initialized.
240 * @pre The Control should be on the stage before setting keyboard focus.
241 * @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.
242 * As the key input focus mechanism works like a stack, the top most control receives all the key events, and passes on the
243 * unhandled events to the controls below in the stack. A control in the stack will regain key input focus when there are no more
244 * controls above it in the focus stack.
245 * To query for the control which is on top of the focus stack use Dali::Toolkit::KeyInputFocusManager::GetCurrentKeyboardFocusActor().
247 bool HasKeyInputFocus();
250 * @brief Once an actor is Set to receive key input focus this function is called to stop it receiving key events.
252 * A check is performed to ensure it was previously set, if this check fails then nothing is done.
254 * @pre The Actor has been initialized.
256 void ClearKeyInputFocus();
261 * @brief Retrieves the pinch gesture detector of the control.
264 * @return The pinch gesture detector
265 * @note Will return an empty handle if the control does not handle the gesture itself.
267 PinchGestureDetector GetPinchGestureDetector() const;
270 * @brief Retrieves the pan gesture detector of the control.
273 * @return The pan gesture detector
274 * @note Will return an empty handle if the control does not handle the gesture itself.
276 PanGestureDetector GetPanGestureDetector() const;
279 * @brief Retrieves the tap gesture detector of the control.
282 * @return The tap gesture detector
283 * @note Will return an empty handle if the control does not handle the gesture itself.
285 TapGestureDetector GetTapGestureDetector() const;
288 * @brief Retrieves the long press gesture detector of the control.
291 * @return The long press gesture detector
292 * @note Will return an empty handle if the control does not handle the gesture itself.
294 LongPressGestureDetector GetLongPressGestureDetector() const;
299 * @brief Sets the name of the style to be applied to the control.
302 * @param[in] styleName A string matching a style described in a stylesheet
304 void SetStyleName( const std::string& styleName );
307 * @brief Retrieves the name of the style to be applied to the control (if any).
309 * @return A string matching a style, or an empty string
311 const std::string& GetStyleName() const;
316 * @brief Sets the background color of the control.
319 * @param[in] color The required background color of the control
321 * @note If SetBackgroundImage is called later, this background color is removed.
323 * @note The background color fully blends with the actor color.
325 void SetBackgroundColor( const Vector4& color );
330 * @brief Retrieves the background color of the control.
333 * @return The background color of the control
335 Vector4 GetBackgroundColor() const DALI_DEPRECATED_API;
338 * @DEPRECATED_1_2_8, use Property::BACKGROUND instead
340 * @brief Sets an image as the background of the control.
343 * @param[in] image The image to set as the background
345 void SetBackgroundImage( Image image ) DALI_DEPRECATED_API;
348 * @brief Clears the background.
351 void ClearBackground();
356 * @brief This signal is emitted when key event is received.
358 * A callback of the following type may be connected:
360 * bool YourCallbackName(Control control, const KeyEvent& event);
362 * The return value of True, indicates that the event should be consumed.
363 * Otherwise the signal will be emitted on the next parent of the actor.
365 * @return The signal to connect to
366 * @pre The Control has been initialized.
368 KeyEventSignalType& KeyEventSignal();
371 * @brief This signal is emitted when the control gets Key Input Focus.
373 * A callback of the following type may be connected:
375 * bool YourCallbackName( Control control );
377 * The return value of True, indicates that the event should be consumed.
378 * Otherwise the signal will be emitted on the next parent of the actor.
380 * @return The signal to connect to
381 * @pre The Control has been initialized.
383 KeyInputFocusSignalType& KeyInputFocusGainedSignal();
386 * @brief This signal is emitted when the control loses Key Input Focus
387 * which could be due to it being gained by another Control or Actor or just cleared from
388 * this control as no longer required.
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& KeyInputFocusLostSignal();
402 public: // Intended for control developers
405 * @brief Creates an initialized Control.
408 * @param[in] implementation The implementation for this control
409 * @return A handle to a newly allocated Dali resource
410 * @note Should NOT be called to create a handle from the implementation. As stated, this allocates a NEW Dali resource.
412 explicit Control(Internal::Control& implementation);
415 * @brief This constructor is used by CustomActor within Dali core to create additional Control handles
416 * using an Internal CustomActor pointer.
419 * @param[in] internal A pointer to a newly allocated Dali resource
421 explicit Control(Dali::Internal::CustomActor* internal);
423 public: // Templates for Deriving Classes
426 * @brief Template to allow deriving controls to DownCast handles to deriving handle classes.
428 * @tparam T The handle class
429 * @tparam I The implementation class
431 * @param[in] handle Handle to an object
432 * @return Handle to a class T or an uninitialized handle
433 * @see DownCast(BaseHandle)
435 template<typename T, typename I>
436 DALI_INTERNAL static T DownCast( BaseHandle handle )
440 CustomActor custom = Dali::CustomActor::DownCast( handle );
443 CustomActorImpl& customImpl = custom.GetImplementation();
445 I* impl = dynamic_cast<I*>(&customImpl);
449 result = T(customImpl.GetOwner());
457 * @brief Template to allow deriving controls to verify whether the Internal::CustomActor* is actually an
458 * implementation of their class.
460 * @tparam I The implementation class
462 * @param[in] internal Pointer to the Internal::CustomActor
465 DALI_INTERNAL void VerifyCustomActorPointer(Dali::Internal::CustomActor* internal)
467 // Can have a NULL pointer so we only need to check if the internal implementation is our class
468 // when there is a value.
471 DALI_ASSERT_DEBUG(dynamic_cast<I*>(&CustomActor(internal).GetImplementation()));
480 } // namespace Toolkit
484 #endif // __DALI_TOOLKIT_CONTROL_H__