1 #ifndef __DALI_CUSTOM_ACTOR_IMPL_H__
2 #define __DALI_CUSTOM_ACTOR_IMPL_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/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 * And 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 Used by derived CustomActorImpl instances, to access the public Actor interface.
74 * @return A pointer to self, or an uninitialized pointer if the CustomActorImpl is not owned.
76 CustomActor Self() const;
79 * @brief Called after the actor has been connected to the stage.
81 * When an actor is connected, it will be directly or indirectly parented to the root Actor.
83 * @param[in] depth The depth in the hierarchy for the actor
85 * @note The root Actor is provided automatically by Dali::Stage, and is always considered to be connected.
86 * When the parent of a set of actors is connected to the stage, then all of the children
87 * will received this callback.
88 * For the following actor tree, the callback order will be A, B, D, E, C, and finally F.
99 * @param[in] depth The depth in the hierarchy for the actor
101 virtual void OnStageConnection( int depth ) = 0;
104 * @brief Called after the actor has been disconnected from Stage.
106 * If an actor is disconnected it either has no parent, or is parented to a disconnected actor.
109 * @note When the parent of a set of actors is disconnected to the stage, then all of the children
110 * will received this callback, starting with the leaf actors.
111 * 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 the owning actor has attempted to remove a child( regardless of whether it succeeded or not ).
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 @ref Actor::GetTargetSize.
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 @ref Actor::GetTargetSize.
165 virtual void OnSizeAnimation(Animation& animation, const Vector3& targetSize) = 0;
168 * @DEPRECATED_1_1.37 Connect to TouchSignal() instead.
170 * @brief Called after a touch-event is received by the owning actor.
173 * @param[in] event The touch event
174 * @return True if the event should be consumed.
175 * @note CustomActorImpl::REQUIRES_TOUCH_EVENTS must be enabled during construction. See CustomActorImpl::CustomActorImpl( ActorFlags flags ).
177 virtual bool OnTouchEvent(const TouchEvent& event) DALI_DEPRECATED_API = 0;
180 * @brief Called after a hover-event is received by the owning actor.
183 * @param[in] event The hover event
184 * @return True if the event should be consumed.
185 * @note CustomActorImpl::REQUIRES_HOVER_EVENTS must be enabled during construction. See CustomActorImpl::CustomActorImpl( ActorFlags flags ).
187 virtual bool OnHoverEvent(const HoverEvent& event) = 0;
190 * @brief Called after a key-event is received by the actor that has had its focus set.
193 * @param[in] event the Key Event
194 * @return True if the event should be consumed.
196 virtual bool OnKeyEvent(const KeyEvent& event) = 0;
199 * @brief Called after a wheel-event is received by the owning actor.
202 * @param[in] event The wheel event
203 * @return True if the event should be consumed.
204 * @note CustomActorImpl::REQUIRES_WHEEL_EVENTS must be enabled during construction. See CustomActorImpl::CustomActorImpl( ActorFlags flags ).
206 virtual bool OnWheelEvent(const WheelEvent& event) = 0;
209 * @brief Called after the size negotiation has been finished for this control.
211 * The control is expected to assign this given size to itself/its children.
213 * Should be overridden by derived classes if they need to layout
214 * actors differently after certain operations like add or remove
215 * actors, resize or after changing specific properties.
218 * @param[in] size The allocated size.
219 * @param[in,out] container The control should add actors to this container that it is not able
220 * to allocate a size for.
221 * @note As this function is called from inside the size negotiation algorithm, you cannot
222 * call RequestRelayout (the call would just be ignored).
224 virtual void OnRelayout( const Vector2& size, RelayoutContainer& container ) = 0;
227 * @brief Notification for deriving classes
230 * @param[in] policy The policy being set
231 * @param[in] dimension The dimension the policy is being set for
233 virtual void OnSetResizePolicy( ResizePolicy::Type policy, Dimension::Type dimension ) = 0;
236 * @brief Return the natural size of the actor.
239 * @return The actor's natural size
241 virtual Vector3 GetNaturalSize() = 0;
244 * @brief Calculate the size for a child.
247 * @param[in] child The child actor to calculate the size for
248 * @param[in] dimension The dimension to calculate the size for. E.g. width or height.
249 * @return Return the calculated size for the given dimension.
251 virtual float CalculateChildSize( const Dali::Actor& child, Dimension::Type dimension ) = 0;
254 * @brief This method is called during size negotiation when a height is required for a given width.
256 * Derived classes should override this if they wish to customize the height returned.
259 * @param width Width to use.
260 * @return The height based on the width.
262 virtual float GetHeightForWidth( float width ) = 0;
265 * @brief This method is called during size negotiation when a width is required for a given height.
267 * Derived classes should override this if they wish to customize the width returned.
270 * @param height Height to use.
271 * @return The width based on the width.
273 virtual float GetWidthForHeight( float height ) = 0;
276 * @brief Determine if this actor is dependent on it's children for relayout.
279 * @param dimension The dimension(s) to check for
280 * @return Return if the actor is dependent on it's children.
282 virtual bool RelayoutDependentOnChildren( Dimension::Type dimension = Dimension::ALL_DIMENSIONS ) = 0;
285 * @brief Virtual method to notify deriving classes that relayout dependencies have been
286 * met and the size for this object is about to be calculated for the given dimension
289 * @param dimension The dimension that is about to be calculated
291 virtual void OnCalculateRelayoutSize( Dimension::Type dimension ) = 0;
294 * @brief Virtual method to notify deriving classes that the size for a dimension
295 * has just been negotiated
298 * @param[in] size The new size for the given dimension
299 * @param[in] dimension The dimension that was just negotiated
301 virtual void OnLayoutNegotiated( float size, Dimension::Type dimension ) = 0;
304 * @brief Retrieve the extension for this control.
307 * @return The extension if available, NULL otherwise
309 virtual Extension* GetExtension()
314 protected: // For derived classes
317 * @brief Flags for the constructor
322 ACTOR_BEHAVIOUR_NONE = 0, ///< Use if no change to default behaviour is needed. @DEPRECATED_1_2_10
323 ACTOR_BEHAVIOUR_DEFAULT = 0, ///< Use to provide default behaviour (size negotiation is on, event callbacks are not called). @SINCE_1_2_10
324 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
325 REQUIRES_TOUCH_EVENTS = 1 << 1, ///< True if the OnTouchEvent() callback is required. @SINCE_1_0.0
326 REQUIRES_HOVER_EVENTS = 1 << 2, ///< True if the OnHoverEvent() callback is required. @SINCE_1_0.0
327 REQUIRES_WHEEL_EVENTS = 1 << 3, ///< True if the OnWheelEvent() callback is required. @SINCE_1_0.0
329 LAST_ACTOR_FLAG ///< Special marker for last actor flag @SINCE_1_0.0
332 static const int ACTOR_FLAG_COUNT = Log< LAST_ACTOR_FLAG - 1 >::value + 1; ///< Value for deriving classes to continue on the flag enum
335 * @brief Create a CustomActorImpl.
337 * @param[in] flags Bitfield of ActorFlags to define behaviour
339 CustomActorImpl( ActorFlags flags );
342 * @brief Virtual destructor
345 virtual ~CustomActorImpl();
347 // Size negotiation helpers
350 * @brief Request a relayout, which means performing a size negotiation on this actor, its parent and children (and potentially whole scene).
352 * This method can also be called from a derived class every time it needs a different size.
353 * At the end of event processing, the relayout process starts and
354 * all controls which requested Relayout will have their sizes (re)negotiated.
357 * @note RelayoutRequest() can be called multiple times; the size negotiation is still
358 * only performed once, i.e. there is no need to keep track of this in the calling side.
360 void RelayoutRequest();
363 * @brief Provides the Actor implementation of GetHeightForWidth.
365 * @param width Width to use.
366 * @return The height based on the width.
368 float GetHeightForWidthBase( float width );
371 * @brief Provides the Actor implementation of GetWidthForHeight.
373 * @param height Height to use.
374 * @return The width based on the height.
376 float GetWidthForHeightBase( float height );
379 * @brief Calculate the size for a child using the base actor object.
382 * @param[in] child The child actor to calculate the size for
383 * @param[in] dimension The dimension to calculate the size for. E.g. width or height
384 * @return Return the calculated size for the given dimension. If more than one dimension is requested, just return the first one found.
386 float CalculateChildSizeBase( const Dali::Actor& child, Dimension::Type dimension );
389 * @brief Determine if this actor is dependent on it's children for relayout from the base class.
392 * @param dimension The dimension(s) to check for
393 * @return Return if the actor is dependent on it's children.
395 bool RelayoutDependentOnChildrenBase( Dimension::Type dimension = Dimension::ALL_DIMENSIONS );
397 public: // Not intended for application developers
400 * @brief Initialize a CustomActor.
402 * @param[in] owner The owning object
403 * @pre The CustomActorImpl is not already owned.
404 * @note Called when ownership of the CustomActorImpl is passed to a CustomActor.
406 void Initialize(Internal::CustomActor& owner);
409 * @brief Get the owner.
411 * This method is needed when creating additional handle objects to existing objects.
412 * Owner is the Dali::Internal::CustomActor that owns the implementation of the custom actor
413 * inside core. Creation of a handle to Dali public API Actor requires this pointer.
415 * @return A pointer to the Actor implementation that owns this custom actor implementation
417 Internal::CustomActor* GetOwner() const;
420 * @brief Returns whether the OnTouchEvent() callback is required.
422 * @return True if the OnTouchEvent() callback is required.
423 * @note Called when ownership of the CustomActorImpl is passed to a CustomActor.
425 bool RequiresTouchEvents() const;
428 * @brief Returns whether the OnHoverEvent() callback is required.
430 * @return True if the OnHoverEvent() callback is required.
431 * @note Called when ownership of the CustomActorImpl is passed to a CustomActor.
433 bool RequiresHoverEvents() const;
436 * @brief Returns whether the OnWheelEvent() callback is required.
438 * @return True if the OnWheelEvent() callback is required.
439 * @note Called when ownership of the CustomActorImpl is passed to a CustomActor.
441 bool RequiresWheelEvents() const;
444 * @brief Returns whether relayout is enabled.
446 * @return Return true if relayout is enabled on the custom actor.
447 * @note Called when ownership of the CustomActorImpl is passed to a CustomActor.
449 bool IsRelayoutEnabled() const;
453 Internal::CustomActor* mOwner; ///< Internal owner of this custom actor implementation
454 ActorFlags mFlags :ACTOR_FLAG_COUNT; ///< ActorFlags flags to determine behaviour
462 #endif // __DALI_CUSTOM_ACTOR_IMPL_H__