1 #ifndef __DALI_CUSTOM_ACTOR_IMPL_H__
2 #define __DALI_CUSTOM_ACTOR_IMPL_H__
5 * Copyright (c) 2015 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/object/property.h>
23 #include <dali/public-api/object/ref-object.h>
24 #include <dali/public-api/actors/actor-enumerations.h>
25 #include <dali/public-api/math/compile-time-math.h>
30 * @addtogroup dali_core_actors
34 namespace Internal DALI_INTERNAL
42 class CustomActorImpl;
43 class RelayoutContainer;
52 * @brief Pointer to Dali::CustomActorImpl object.
55 typedef IntrusivePtr<CustomActorImpl> CustomActorImplPtr;
58 * @brief CustomActorImpl is an abstract base class for custom control implementations.
60 * This provides a series of pure virtual methods, which are called when actor-specific events occur.
61 * An CustomActorImpl is typically owned by a single CustomActor instance; see also CustomActor::CustomActor( CustomActorImpl &implementation ).
64 class DALI_IMPORT_API CustomActorImpl : public Dali::RefObject
68 class Extension; ///< Forward declare future extension interface
71 * @brief Virtual destructor.
74 virtual ~CustomActorImpl();
77 * @brief Used by derived CustomActorImpl instances, to access the public Actor interface.
80 * @return A pointer to self, or an uninitialized pointer if the CustomActorImpl is not owned.
82 CustomActor Self() const;
85 * @brief Called after the actor has been connected to the stage.
87 * When an actor is connected, it will be directly or indirectly parented to the root Actor.
89 * @param[in] depth The depth in the hierarchy for the actor
91 * @note The root Actor is provided automatically by Dali::Stage, and is always considered to be connected.
92 * When the parent of a set of actors is connected to the stage, then all of the children
93 * will received this callback.
94 * For the following actor tree, the callback order will be A, B, D, E, C, and finally F.
106 virtual void OnStageConnection( int depth ) = 0;
109 * @brief Called after the actor has been disconnected from Stage.
111 * If an actor is disconnected it either has no parent, or is parented to a disconnected actor.
114 * @note When the parent of a set of actors is disconnected to the stage, then all of the children
115 * will received this callback, starting with the leaf actors.
116 * For the following actor tree, the callback order will be D, E, B, F, C, and finally A.
128 virtual void OnStageDisconnection() = 0;
131 * @brief Called after a child has been added to the owning actor.
134 * @param[in] child The child which has been added.
136 virtual void OnChildAdd(Actor& child) = 0;
139 * @brief Called after a child has been removed from the owning actor.
142 * @param[in] child The child being removed.
144 virtual void OnChildRemove(Actor& child) = 0;
147 * @brief Called when the owning actor property is set.
150 * @param[in] index The Property index that was set.
151 * @param[in] propertyValue The value to set.
153 virtual void OnPropertySet( Property::Index index, Property::Value propertyValue );
156 * @brief Called when the owning actor's size is set e.g. using Actor::SetSize().
159 * @param[in] targetSize The target size. Note that this target size may not match the size returned via @ref Actor::GetSize.
161 virtual void OnSizeSet(const Vector3& targetSize) = 0;
164 * @brief Called when the owning actor's size is animated e.g. using Animation::AnimateTo( Property( actor, Actor::Property::SIZE ), ... ).
167 * @param[in] animation The object which is animating the owning actor.
168 * @param[in] targetSize The target size. Note that this target size may not match the size returned via @ref Actor::GetSize.
170 virtual void OnSizeAnimation(Animation& animation, const Vector3& targetSize) = 0;
173 * @brief Called after a touch-event is received by the owning actor.
176 * @param[in] event The touch event.
177 * @return True if the event should be consumed.
178 * @note This must be enabled during construction. See CustomActorImpl::CustomActorImpl( ActorFlags flags ).
180 virtual bool OnTouchEvent(const TouchEvent& event) = 0;
183 * @brief Called after a hover-event is received by the owning actor.
186 * @param[in] event The hover event.
187 * @return True if the event should be consumed.
188 * @note This must be enabled during construction. See CustomActorImpl::CustomActorImpl( ActorFlags flags ).
190 virtual bool OnHoverEvent(const HoverEvent& event) = 0;
193 * @brief Called after a key-event is received by the actor that has had its focus set.
196 * @param[in] event the Key Event
197 * @return True if the event should be consumed.
199 virtual bool OnKeyEvent(const KeyEvent& event) = 0;
202 * @brief Called after a wheel-event is received by the owning actor.
205 * @param[in] event The wheel event.
206 * @return True if the event should be consumed.
207 * @note This must be enabled during construction. See CustomActorImpl::CustomActorImpl( ActorFlags flags ).
209 virtual bool OnWheelEvent(const WheelEvent& event) = 0;
212 * @brief Called after the size negotiation has been finished for this control.
214 * The control is expected to assign this given size to itself/its children.
216 * Should be overridden by derived classes if they need to layout
217 * actors differently after certain operations like add or remove
218 * actors, resize or after changing specific properties.
221 * @param[in] size The allocated size.
222 * @param[in,out] container The control should add actors to this container that it is not able
223 * to allocate a size for.
225 virtual void OnRelayout( const Vector2& size, RelayoutContainer& container ) = 0;
228 * @brief Notification for deriving classes
231 * @param[in] policy The policy being set
232 * @param[in] dimension The dimension the policy is being set for
234 virtual void OnSetResizePolicy( ResizePolicy::Type policy, Dimension::Type dimension ) = 0;
237 * @brief Return the natural size of the actor
240 * @return The actor's natural size
242 virtual Vector3 GetNaturalSize() = 0;
245 * @brief Calculate the size for a child
248 * @param[in] child The child actor to calculate the size for
249 * @param[in] dimension The dimension to calculate the size for. E.g. width or height.
250 * @return Return the calculated size for the given dimension
252 virtual float CalculateChildSize( const Dali::Actor& child, Dimension::Type dimension ) = 0;
255 * @brief This method is called during size negotiation when a height is required for a given width.
257 * Derived classes should override this if they wish to customize the height returned.
260 * @param width Width to use.
261 * @return The height based on the width.
263 virtual float GetHeightForWidth( float width ) = 0;
266 * @brief This method is called during size negotiation when a width is required for a given height.
268 * Derived classes should override this if they wish to customize the width returned.
271 * @param height Height to use.
272 * @return The width based on the width.
274 virtual float GetWidthForHeight( float height ) = 0;
277 * @brief Determine if this actor is dependent on it's children for relayout
280 * @param dimension The dimension(s) to check for
281 * @return Return if the actor is dependent on it's children
283 virtual bool RelayoutDependentOnChildren( Dimension::Type dimension = Dimension::ALL_DIMENSIONS ) = 0;
286 * @brief Virtual method to notify deriving classes that relayout dependencies have been
287 * met and the size for this object is about to be calculated for the given dimension
290 * @param dimension The dimension that is about to be calculated
292 virtual void OnCalculateRelayoutSize( Dimension::Type dimension ) = 0;
295 * @brief Virtual method to notify deriving classes that the size for a dimension
296 * has just been negotiated
299 * @param[in] size The new size for the given dimension
300 * @param[in] dimension The dimension that was just negotiated
302 virtual void OnLayoutNegotiated( float size, Dimension::Type dimension ) = 0;
305 * @brief Retrieve the extension for this control
308 * @return The extension if available, NULL otherwise
310 virtual Extension* GetExtension()
315 protected: // For derived classes
317 // Flags for the constructor
320 ACTOR_BEHAVIOUR_NONE = 0,
321 DISABLE_SIZE_NEGOTIATION = 1 << 0, ///< True if control does not need size negotiation, i.e. it can be skipped in the algorithm @since_tizen 2.4
322 REQUIRES_TOUCH_EVENTS = 1 << 1, ///< True if the OnTouchEvent() callback is required. @since_tizen 2.4
323 REQUIRES_HOVER_EVENTS = 1 << 2, ///< True if the OnHoverEvent() callback is required. @since_tizen 2.4
324 REQUIRES_WHEEL_EVENTS = 1 << 3, ///< True if the OnWheelEvent() callback is required. @since_tizen 2.4
326 LAST_ACTOR_FLAG ///< Special marker for last actor flag @since_tizen 2.4
329 static const int ACTOR_FLAG_COUNT = Log< LAST_ACTOR_FLAG - 1 >::value + 1; ///< Value for deriving classes to continue on the flag enum
332 * @brief Create a CustomActorImpl.
334 * @param[in] flags Bitfield of ActorFlags to define behaviour
336 CustomActorImpl( ActorFlags flags );
338 // Size negotiation helpers
341 * @brief Request a relayout, which means performing a size negotiation on this actor, its parent and children (and potentially whole scene)
343 * This method can also be called from a derived class every time it needs a different size.
344 * At the end of event processing, the relayout process starts and
345 * all controls which requested Relayout will have their sizes (re)negotiated.
348 * @note RelayoutRequest() can be called multiple times; the size negotiation is still
349 * only performed once, i.e. there is no need to keep track of this in the calling side.
351 void RelayoutRequest();
354 * @brief provides the Actor implementation of GetHeightForWidth
356 * @param width Width to use.
357 * @return The height based on the width.
359 float GetHeightForWidthBase( float width );
362 * @brief Provides the Actor implementation of GetWidthForHeight
364 * @param height Height to use.
365 * @return The width based on the height.
367 float GetWidthForHeightBase( float height );
370 * @brief Calculate the size for a child using the base actor object
373 * @param[in] child The child actor to calculate the size for
374 * @param[in] dimension The dimension to calculate the size for. E.g. width or height.
375 * @return Return the calculated size for the given dimension
377 float CalculateChildSizeBase( const Dali::Actor& child, Dimension::Type dimension );
380 * @brief Determine if this actor is dependent on it's children for relayout from the base class
383 * @param dimension The dimension(s) to check for
384 * @return Return if the actor is dependent on it's children
386 bool RelayoutDependentOnChildrenBase( Dimension::Type dimension = Dimension::ALL_DIMENSIONS );
388 public: // Not intended for application developers
391 * @brief Called when ownership of the CustomActorImpl is passed to a CustomActor.
393 * @param[in] owner The owning object.
394 * @pre The CustomActorImpl is not already owned.
396 void Initialize(Internal::CustomActor& owner);
399 * @brief Get the owner.
401 * This method is needed when creating additional handle objects to existing objects.
402 * Owner is the Dali::Internal::CustomActor that owns the implementation of the custom actor
403 * inside core. Creation of a handle to Dali public API Actor requires this pointer.
405 * @return A pointer to the Actor implementation that owns this custom actor implementation
407 Internal::CustomActor* GetOwner() const;
410 * @brief Called when ownership of the CustomActorImpl is passed to a CustomActor.
412 * @return True if the OnTouchEvent() callback is required.
414 bool RequiresTouchEvents() const;
417 * @brief Called when ownership of the CustomActorImpl is passed to a CustomActor.
419 * @return True if the OnHoverEvent() callback is required.
421 bool RequiresHoverEvents() const;
424 * @brief Called when ownership of the CustomActorImpl is passed to a CustomActor.
426 * @return True if the OnWheelEvent() callback is required.
428 bool RequiresWheelEvents() const;
431 * @brief Called when ownership of the CustomActorImpl is passed to a CustomActor.
433 * @return Return true if relayout is enabled on the custom actor
435 bool IsRelayoutEnabled() const;
439 Internal::CustomActor* mOwner; ///< Internal owner of this custom actor implementation
440 ActorFlags mFlags :ACTOR_FLAG_COUNT; ///< ActorFlags flags to determine behaviour
448 #endif // __DALI_CUSTOM_ACTOR_IMPL_H__