1 #ifndef __DALI_TOOLKIT_SCROLL_CONNECTOR_H__
2 #define __DALI_TOOLKIT_SCROLL_CONNECTOR_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 #include <dali/dali.h>
23 namespace Dali DALI_IMPORT_API
29 namespace Internal DALI_INTERNAL
31 class ScrollConnector;
35 * ScrollConnector is used to connect scrollable containers with components such as scroll bars, indicators etc.
37 * This basically consists of:
38 * - A "scroll-position" property which controls which part of the scrollable content is visible
39 * - The minimum/maximum limits of the scroll position, which corresponds to the start & end points of the scollable list etc.
40 * - An "overshoot" property which shows any attempts to exceed the start & end points.
41 * - The scrollable content size, which corresponds to the length of the scrollable content in the scrollable container in actor coordinates.
43 * The provider of the scrollable content is responsible for calling SetScrollDomain(). Scroll-bar components are then expected to
44 * receive these values via the DOMAIN_CHANGED signal.
46 * The scroll-position property is accessible via GetScrollPositionObject(). This is intended to be shared by multiple controls
47 * e.g. a list control may be scrolled by panning the list content, or indirectly by dragging a connected scroll-bar control.
49 * The overshoot property is intended for implementing 'end of list' style indicators. This property is expected to be in the range
50 * -1 to 1, where -1 shows an attempt the scroll beyond the minimum limit, and 1 shows an attempt the scroll beyond the maximum limit.
51 * Zero indicates normal scrolling i.e. when overshoot indicators should be hidden.
53 class ScrollConnector : public BaseHandle
57 static const char* const SCROLL_POSITION_PROPERTY_NAME; ///< This float "scroll-position" property is available via GetScrollPositionObject()
58 static const char* const OVERSHOOT_PROPERTY_NAME; ///< This float "overshoot" property is available via GetScrollPositionObject()
60 static const Property::Index SCROLL_POSITION; ///< The index of the "scroll-position" property
61 static const Property::Index OVERSHOOT; ///< The index of the "overshoot" property
64 static const char* const DOMAIN_CHANGED_SIGNAL_NAME; ///< "domain-changed" signal name
65 typedef SignalV2< void ( float min, float max, float size ) > DomainChangedSignalType;
68 * Create a ScrollConnector.
69 * @return A handle to a newly allocated ScrollConnector.
71 static ScrollConnector New();
74 * Create an empty handle.
80 * @param handle A handle to copy.
82 ScrollConnector( const ScrollConnector& handle );
85 * @copydoc Dali::BaseHandle::operator=
87 using Dali::BaseHandle::operator=;
92 virtual ~ScrollConnector();
95 * Downcast a BaseHandle to ScrollConnector handle.
96 * @return A handle to a ScrollConnector or an empty handle.
98 static ScrollConnector DownCast( BaseHandle handle );
101 * Set the scroll domain, corresponding to the start & end position, and size of the scrollable content in actor coordinates.
102 * @param[in] min The minimum scroll position limit.
103 * @param[in] max The maximum scroll position limit.
104 * @param[in] length The length of the scrollable content in actor coordinates.
106 void SetScrollDomain( float min, float max, float length );
109 * Retrieve the min limit.
110 * @return The minimum value.
112 float GetMinLimit() const;
115 * Retrieve the max limit.
116 * @return The maximum value.
118 float GetMaxLimit() const;
121 * Retrieve the length of the scrollable content in actor coordinates.
122 * @return The length of the scrollable content.
124 float GetContentLength() const;
127 * Signal emitted after the SetScrollDomain() method has been called.
129 ScrollConnector::DomainChangedSignalType& DomainChangedSignal();
132 * Retrieve the object which provides the "scroll-position" property.
133 * @return The scroll-position object.
135 Constrainable GetScrollPositionObject() const;
137 public: // Not intended for application developers
140 * Creates a handle using the Toolkit::Internal implementation.
141 * @param[in] impl The Control implementation.
143 ScrollConnector( Internal::ScrollConnector* impl );
146 } // namespace Toolkit
150 #endif // __DALI_TOOLKIT_SCROLL_CONNECTOR_H__