1 #ifndef __DALI_TOOLKIT_CONTROL_H__
2 #define __DALI_TOOLKIT_CONTROL_H__
5 // Copyright (c) 2014 Samsung Electronics Co., Ltd.
7 // Licensed under the Flora License, Version 1.0 (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://floralicense.org/license/
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.
21 * @addtogroup CAPI_DALI_TOOLKIT_CONTROLS_MODULE
26 #include <dali/dali.h>
28 namespace Dali DALI_IMPORT_API
34 //Forward declarations.
39 * @brief Control is the base class for all controls.
41 * The implementation of the control must be supplied; see ControlImpl for more details.
44 class Control : public CustomActor, public ConnectionTrackerInterface
49 static const char* const ACTION_CONTROL_ACTIVATED; ///< name "control-activated"
52 static const char* const SIGNAL_KEY_EVENT; ///< name "key-event"
55 * @brief Describes how a control could be resized.
59 Fixed, ///< Size can't grow or shrink.
60 Minimum, ///< Size can grow but shrink up to a minimum level.
61 Maximum, ///< Size can shrink but grow up to a maximum value.
62 Range, ///< Size can grow or shrink between a minimum and a maximum values.
63 Flexible, ///< Size can grow or shrink with no limits.
67 * @brief Describes what a control should do when a contained actor/control exceeds the boundary of the control.
71 Crop, ///< Control's contents will be cropped.
72 Shrink, ///< Control's contents will be shrunk.
73 Scroll ///< Control's contents will be added to a scroll.
77 * @brief Describes the direction to move the keyboard focus towards.
79 enum KeyboardFocusNavigationDirection
81 Left, ///< Move keyboard focus towards the left direction
82 Right, ///< Move keyboard focus towards the right direction
83 Up, ///< Move keyboard focus towards the up direction
84 Down ///< Move keyboard focus towards the down direction
89 /// @brief Key Event signal type;
90 typedef SignalV2<bool ( Control, const KeyEvent& ) > KeyEventSignalV2;
92 public: // Creation & Destruction
95 * @brief Create a new instance of a Control.
97 * @return A handle to a new Control.
102 * @brief Create an uninitialized Control handle.
104 * Only derived versions can be instantiated. Calling member
105 * functions with an uninitialized Dali::Object is not allowed.
110 * @brief Copy constructor.
112 * Creates another handle that points to the same real object
113 * @param[in] uiControl Handle to copy
115 Control(const Control& uiControl);
118 * @brief Virtual destructor.
120 * Dali::Object derived classes do not contain member data.
127 * @brief Assignment operator.
129 * Changes this handle to point to another real object
130 * @param[in] handle Object to assign this to
131 * @return reference to this
133 Control& operator=( const Control& handle );
138 * @brief Downcast an Object handle to Control.
140 * If handle points to a Control the downcast produces valid
141 * handle. If not the returned handle is left uninitialized.
143 * @param[in] handle Handle to an object
144 * @return handle to a Control or an uninitialized handle
146 static Control DownCast( BaseHandle handle );
149 * @brief Retrieve the Control implementation.
151 * @return The implementation.
153 ControlImpl& GetImplementation();
156 * @brief Retrieve the Control implementation.
158 * @return The implementation.
160 const ControlImpl& GetImplementation() const;
163 * @brief Sets the size policies for the width and height dimensions.
165 * @param[in] widthPolicy Size policy for the width dimension.
166 * @param[in] heightPolicy Size policy for the height dimension.
168 void SetSizePolicy( SizePolicy widthPolicy, SizePolicy heightPolicy );
171 * @brief Retrieves the size policies for the width and height dimensions.
173 * @param[out] widthPolicy Width's size policy.
174 * @param[out] heightPolicy Height's size policy.
176 void GetSizePolicy( SizePolicy& widthPolicy, SizePolicy& heightPolicy ) const;
179 * @brief Sets the minimum size for the control.
181 * @param[in] size The minimum size.
183 void SetMinimumSize( const Vector3& size );
186 * @brief Retrieves the minimum size.
188 * @return The minimum size.
190 const Vector3& GetMinimumSize() const;
193 * @brief Sets the maximum size.
195 * @param[in] size The maximum size.
197 void SetMaximumSize( const Vector3& size );
200 * @brief Retrieves the maximum size.
202 * @return The maximum size.
204 const Vector3& GetMaximumSize() const;
207 * @brief Works out the natural size.
209 * Natural size is the control's size with any restriction.
211 * @return The natural size.
213 Vector3 GetNaturalSize();
216 * @brief Works out the control's height for a given width.
218 * @param[in] width The control's width.
220 * @return The control's height for the given width.
222 float GetHeightForWidth( float width );
225 * @brief Works out the control's width for a given height.
227 * @param[in] height The control's height.
229 * @return The control's width for the given height.
231 float GetWidthForHeight( float height );
234 * @brief This sets the control to receive key events.
236 * The key event can originate from a virtual or physical keyboard.
237 * @pre The Control has been initialized.
238 * @pre The Control should be on the stage before setting keyboard focus.
239 * @return True if the control has foucs, False otherwise.
241 void SetKeyInputFocus();
244 * @brief Quries whether the control has key input focus.
246 * 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.
247 * As the key input focus mechanism works like a stack, the top most control receives all the key events, and passes on the
248 * unhandled events to the controls below in the stack. A control in the stack will regain key input focus when there are no more
249 * controls above it in the focus stack.
250 * To query for the conrol which is on top of the focus stack use Dali::Toolkit::KeyInputFocusManager::GetCurrentKeyboardFocusActor()
251 * @pre The Control has been initialized.
252 * @pre The Control should be on the stage before setting keyboard focus.
253 * @return true if this control has keyboard input focus
255 bool HasKeyInputFocus();
258 * @brief Once an actor is Set to receive key input focus this function is called to stop it receiving key events.
260 * A check is performed to ensure it was previously set, if this check fails then nothing is done.
261 * @pre The Actor has been initialized.
263 void ClearKeyInputFocus();
269 * @brief This signal is emitted when key event is received.
271 * A callback of the following type may be connected:
273 * bool YourCallbackName(Control control, const KeyEvent& event);
275 * The return value of True, indicates that the touch event should be consumed.
276 * Otherwise the signal will be emitted on the next sensitive parent of the actor.
277 * @pre The Control has been initialized.
278 * @return The signal to connect to.
280 KeyEventSignalV2& KeyEventSignal();
285 * @copydoc ConnectionTrackerInterface::SignalConnected
287 virtual void SignalConnected( SlotObserver* slotObserver, CallbackBase* callback );
290 * @copydoc ConnectionTrackerInterface::SignalDisconnected
292 virtual void SignalDisconnected( SlotObserver* slotObserver, CallbackBase* callback );
295 * @copydoc ConnectionTrackerInterface::GetConnectionCount
297 virtual std::size_t GetConnectionCount() const;
299 public: // Not intended for application developers
302 * @brief Create an initialised Control.
304 * @param[in] implementation The implementation for this control.
305 * @return A handle to a newly allocated Dali resource.
307 Control(ControlImpl& implementation);
310 * @brief This constructor is used by CustomActor within Dali core to create additional Control handles
311 * using an Internal CustomActor pointer.
313 * @param [in] internal A pointer to a newly allocated Dali resource
315 Control(Dali::Internal::CustomActor* internal);
317 public: // Templates for Deriving Classes
320 * @brief Template to allow deriving controls to DownCast handles to deriving handle classes.
322 * @tparam T The handle class
323 * @tparam I The implementation class
324 * @param[in] handle Handle to an object
325 * @return Handle to a class T or an uninitialized handle.
326 * @see DownCast(BaseHandle)
328 template<typename T, typename I>
329 static T DownCast( BaseHandle handle )
333 CustomActor custom = Dali::CustomActor::DownCast( handle );
336 CustomActorImpl& customImpl = custom.GetImplementation();
338 I* impl = dynamic_cast<I*>(&customImpl);
342 result = T(customImpl.GetOwner());
350 * @brief Template to allow deriving controls to verify whether the Internal::CustomActor* is actually an
351 * implementation of their class.
353 * @tparam I The implementation class
354 * @param[in] internal Pointer to the Internal::CustomActor
357 void VerifyCustomActorPointer(Dali::Internal::CustomActor* internal)
359 // Can have a NULL pointer so we only need to check if the internal implementation is our class
360 // when there is a value.
363 DALI_ASSERT_DEBUG(dynamic_cast<I*>(&CustomActor(internal).GetImplementation()));
369 } // namespace Toolkit
376 #endif // __DALI_TOOLKIT_CONTROL_H__