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::New(CustomActorImplPtr).
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 * @note The root Actor is provided automatically by Dali::Stage, and is always considered to be connected.
91 * @note When the parent of a set of actors is connected to the stage, then all of the children
92 * will received this callback.
94 * For the following actor tree, the callback order will be A, B, D, E, C, and finally F.
102 * @param[in] depth The depth in the hierarchy for the actor
104 virtual void OnStageConnection( int depth ) = 0;
107 * @brief Called after the actor has been disconnected from the stage.
109 * If an actor is disconnected it either has no parent, or is parented to a disconnected actor.
112 * @note When the parent of a set of actors is disconnected to the stage, then all of the children
113 * will received this callback, starting with the leaf actors.
115 * For the following actor tree, the callback order will be D, E, B, F, C, and finally A.
123 virtual void OnStageDisconnection() = 0;
126 * @brief Called after a child has been added to the owning actor.
129 * @param[in] child The child which has been added.
131 virtual void OnChildAdd(Actor& child) = 0;
134 * @brief Called after a child has been removed from the owning actor.
137 * @param[in] child The child being removed.
139 virtual void OnChildRemove(Actor& child) = 0;
142 * @brief Called when the owning actor property is set.
145 * @param[in] index The Property index that was set.
146 * @param[in] propertyValue The value to set.
148 virtual void OnPropertySet( Property::Index index, Property::Value propertyValue );
151 * @brief Called when the owning actor's size is set e.g. using Actor::SetSize().
154 * @param[in] targetSize The target size. Note that this target size may not match the size returned via Actor::GetSize().
156 virtual void OnSizeSet(const Vector3& targetSize) = 0;
159 * @brief Called when the owning actor's size is animated e.g. using Animation::AnimateTo( Property( actor, Actor::Property::SIZE ), ... ).
162 * @param[in] animation The object which is animating the owning actor.
163 * @param[in] targetSize The target size. Note that this target size may not match the size returned via Actor::GetSize().
165 virtual void OnSizeAnimation(Animation& animation, const Vector3& targetSize) = 0;
168 * @brief Called after a touch-event is received by the owning actor.
171 * @param[in] event The touch event.
172 * @return True if the event should be consumed.
173 * @note This must be enabled during construction; see CustomActorImpl::CustomActorImpl(bool)
175 virtual bool OnTouchEvent(const TouchEvent& event) = 0;
178 * @brief Called after a hover-event is received by the owning actor.
181 * @param[in] event The hover event.
182 * @return True if the event should be consumed.
183 * @note This must be enabled during construction; see CustomActorImpl::SetRequiresHoverEvents(bool)
185 virtual bool OnHoverEvent(const HoverEvent& event) = 0;
188 * @brief Called after a key-event is received by the actor that has had its focus set.
191 * @param[in] event the Key Event
192 * @return True if the event should be consumed.
194 virtual bool OnKeyEvent(const KeyEvent& event) = 0;
197 * @brief Called after a wheel-event is received by the owning actor.
200 * @param[in] event The wheel event.
201 * @return True if the event should be consumed.
202 * @note This must be enabled during construction; see CustomActorImpl::SetRequiresWheelEvents(bool)
204 virtual bool OnWheelEvent(const WheelEvent& event) = 0;
207 * @brief Called after the size negotiation has been finished for this control.
209 * The control is expected to assign this given size to itself/its children.
211 * Should be overridden by derived classes if they need to layout
212 * actors differently after certain operations like add or remove
213 * actors, resize or after changing specific properties.
215 * Note! As this function is called from inside the size negotiation algorithm, you cannot
216 * call RequestRelayout (the call would just be ignored)
219 * @param[in] size The allocated size.
220 * @param[in,out] container The control should add actors to this container that it is not able
221 * to allocate a size for.
223 virtual void OnRelayout( const Vector2& size, RelayoutContainer& container ) = 0;
226 * @brief Notification for deriving classes
229 * @param[in] policy The policy being set
230 * @param[in] dimension The dimension the policy is being set for
232 virtual void OnSetResizePolicy( ResizePolicy::Type policy, Dimension::Type dimension ) = 0;
235 * @brief Return the natural size of the actor
238 * @return The actor's natural size
240 virtual Vector3 GetNaturalSize() = 0;
243 * @brief Calculate the size for a child
246 * @param[in] child The child actor to calculate the size for
247 * @param[in] dimension The dimension to calculate the size for. E.g. width or height.
248 * @return Return the calculated size for the given dimension
250 virtual float CalculateChildSize( const Dali::Actor& child, Dimension::Type dimension ) = 0;
253 * @brief This method is called during size negotiation when a height is required for a given width.
255 * Derived classes should override this if they wish to customize the height returned.
258 * @param width to use.
259 * @return the height based on the width.
261 virtual float GetHeightForWidth( float width ) = 0;
264 * @brief This method is called during size negotiation when a width is required for a given height.
266 * Derived classes should override this if they wish to customize the width returned.
269 * @param height to use.
270 * @return the width based on the width.
272 virtual float GetWidthForHeight( float height ) = 0;
275 * @brief Determine if this actor is dependent on it's children for relayout
278 * @param dimension The dimension(s) to check for
279 * @return Return if the actor is dependent on it's children
281 virtual bool RelayoutDependentOnChildren( Dimension::Type dimension = Dimension::ALL_DIMENSIONS ) = 0;
284 * @brief Virtual method to notify deriving classes that relayout dependencies have been
285 * met and the size for this object is about to be calculated for the given dimension
288 * @param dimension The dimension that is about to be calculated
290 virtual void OnCalculateRelayoutSize( Dimension::Type dimension ) = 0;
293 * @brief Virtual method to notify deriving classes that the size for a dimension
294 * has just been negotiated
297 * @param[in] size The new size for the given dimension
298 * @param[in] dimension The dimension that was just negotiated
300 virtual void OnLayoutNegotiated( float size, Dimension::Type dimension ) = 0;
303 * @brief Retrieve the extension for this control
306 * @return The extension if available, NULL otherwise
308 virtual Extension* GetExtension()
313 protected: // For derived classes
315 // Flags for the constructor
318 ACTOR_BEHAVIOUR_NONE = 0,
319 DISABLE_SIZE_NEGOTIATION = 1 << 0, ///< True if control does not need size negotiation, i.e. it can be skipped in the algorithm @SINCE_1_0.0
320 REQUIRES_TOUCH_EVENTS = 1 << 1, ///< True if the OnTouchEvent() callback is required. @SINCE_1_0.0
321 REQUIRES_HOVER_EVENTS = 1 << 2, ///< True if the OnHoverEvent() callback is required. @SINCE_1_0.0
322 REQUIRES_WHEEL_EVENTS = 1 << 3, ///< True if the OnWheelEvent() callback is required. @SINCE_1_0.0
324 LAST_ACTOR_FLAG ///< Special marker for last actor flag @SINCE_1_0.0
327 static const int ACTOR_FLAG_COUNT = Log< LAST_ACTOR_FLAG - 1 >::value + 1; ///< Value for deriving classes to continue on the flag enum
330 * @brief Create a CustomActorImpl.
332 * @param[in] flags Bitfield of ActorFlags to define behaviour
334 CustomActorImpl( ActorFlags flags );
336 // Size negotiation helpers
339 * @brief Request a relayout, which means performing a size negotiation on this actor, its parent and children (and potentially whole scene)
341 * This method can also be called from a derived class every time it needs a different size.
342 * At the end of event processing, the relayout process starts and
343 * all controls which requested Relayout will have their sizes (re)negotiated.
346 * @note RelayoutRequest() can be called multiple times; the size negotiation is still
347 * only performed once, i.e. there is no need to keep track of this in the calling side.
349 void RelayoutRequest();
352 * @brief provides the Actor implementation of GetHeightForWidth
354 * @param width to use.
355 * @return the height based on the width.
357 float GetHeightForWidthBase( float width );
360 * @brief provides the Actor implementation of GetWidthForHeight
362 * @param height to use.
363 * @return the width based on the height.
365 float GetWidthForHeightBase( float height );
368 * @brief Calculate the size for a child using the base actor object
371 * @param[in] child The child actor to calculate the size for
372 * @param[in] dimension The dimension to calculate the size for. E.g. width or height.
373 * @return Return the calculated size for the given dimension
375 float CalculateChildSizeBase( const Dali::Actor& child, Dimension::Type dimension );
378 * @brief Determine if this actor is dependent on it's children for relayout from the base class
381 * @param dimension The dimension(s) to check for
382 * @return Return if the actor is dependent on it's children
384 bool RelayoutDependentOnChildrenBase( Dimension::Type dimension = Dimension::ALL_DIMENSIONS );
386 public: // Not intended for application developers
389 * @brief Called when ownership of the CustomActorImpl is passed to a CustomActor.
391 * @param[in] owner The owning object.
392 * @pre The CustomActorImpl is not already owned.
394 void Initialize(Internal::CustomActor& owner);
397 * @brief Get the owner.
399 * This method is needed when creating additional handle objects to existing objects.
400 * Owner is the Dali::Internal::CustomActor that owns the implementation of the custom actor
401 * inside core. Creation of a handle to Dali public API Actor requires this pointer.
403 * @return a pointer to the Actor implementation that owns this custom actor implementation
405 Internal::CustomActor* GetOwner() const;
408 * @brief Called when ownership of the CustomActorImpl is passed to a CustomActor.
410 * @return True if the OnTouchEvent() callback is required.
412 bool RequiresTouchEvents() const;
415 * @brief Called when ownership of the CustomActorImpl is passed to a CustomActor.
417 * @return True if the OnHoverEvent() callback is required.
419 bool RequiresHoverEvents() const;
422 * @brief Called when ownership of the CustomActorImpl is passed to a CustomActor.
424 * @return True if the OnWheelEvent() callback is required.
426 bool RequiresWheelEvents() const;
429 * @brief Called when ownership of the CustomActorImpl is passed to a CustomActor.
431 * @return Return true if relayout is enabled on the custom actor
433 bool IsRelayoutEnabled() const;
437 Internal::CustomActor* mOwner; ///< Internal owner of this custom actor implementation
438 ActorFlags mFlags :ACTOR_FLAG_COUNT; ///< ActorFlags flags to determine behaviour
446 #endif // __DALI_CUSTOM_ACTOR_IMPL_H__