2 // Copyright (c) 2014 Samsung Electronics Co., Ltd.
4 // Licensed under the Flora License, Version 1.0 (the License);
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
8 // http://floralicense.org/license/
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an AS IS BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
17 #include <dali-toolkit/internal/controls/scroll-bar/scroll-bar-impl.h>
18 #include <dali-toolkit/internal/controls/scrollable/item-view/item-view-impl.h>
25 const char* DEFAULT_INDICATOR_IMAGE_PATH = DALI_IMAGE_DIR "popup_scroll.png";
26 const Vector4 DEFAULT_INDICATOR_NINE_PATCH_BORDER(4.0f, 9.0f, 7.0f, 11.0f);
27 const float MINIMUM_INDICATOR_HEIGHT(20.0f); // The minimum indicator height for the nine patch border
28 const float DEFAULT_SLIDER_DEPTH(1.0f);
29 const float INDICATOR_SHOW_TIME(0.5f);
30 const float INDICATOR_HIDE_TIME(0.5f);
31 const float DEFAULT_PAN_GESTURE_PROCESS_TIME(16.7f); // 16.7 milliseconds, i.e. one frame
32 const float DEFAULT_INDICATOR_FIXED_HEIGHT(80.0f);
35 * Indicator size constraint
36 * Indicator size depends on both indicator's parent size and the scroll content size
38 struct IndicatorSizeConstraint
41 * @param[in] contentSize The size of scrollable content
43 IndicatorSizeConstraint(float contentSize)
44 : mContentSize(contentSize)
50 * @param[in] current The current indicator size
51 * @param[in] parentSizeProperty The parent size of scroll indicator.
52 * @return The new scroll indicator size.
54 Vector3 operator()(const Vector3& current,
55 const PropertyInput& parentSizeProperty)
57 const Vector3& parentSize = parentSizeProperty.GetVector3();
58 float height = mContentSize > parentSize.height ? parentSize.height * ( parentSize.height / mContentSize ) : parentSize.height * ( (parentSize.height - mContentSize * 0.5f) / parentSize.height);
59 return Vector3( parentSize.width, std::max(MINIMUM_INDICATOR_HEIGHT, height), parentSize.depth );
62 float mContentSize; ///< The size of scrollable content
66 * Indicator position constraint
67 * Positions the indicator to reflect the current scroll position within the scroll domain.
69 struct IndicatorPositionConstraint
72 * @param[in] minPosition The minimum limit of scroll position
73 * @param[in] maxPosition the maximum limit of scroll position
75 IndicatorPositionConstraint(float minPosition, float maxPosition)
76 : mMinPosition(minPosition),
77 mMaxPosition(maxPosition)
83 * @param[in] current The current indicator position
84 * @param[in] indicatorSizeProperty The size of indicator.
85 * @param[in] parentSizeProperty The parent size of indicator.
86 * @param[in] scrollPositionProperty The scroll position of the scrollable container // (from 0.0 -> 1.0 in each axis)
87 * @return The new indicator position is returned.
89 Vector3 operator()(const Vector3& current,
90 const PropertyInput& indicatorSizeProperty,
91 const PropertyInput& parentSizeProperty,
92 const PropertyInput& scrollPositionProperty)
94 Vector3 indicatorSize = indicatorSizeProperty.GetVector3();
95 Vector3 parentSize = parentSizeProperty.GetVector3();
96 float scrollPosition = scrollPositionProperty.GetFloat();
98 const float domainSize = fabs(mMaxPosition - mMinPosition);
99 float relativePosition = (mMaxPosition - scrollPosition) / domainSize;
100 return Vector3(current.x, relativePosition * (parentSize.height - indicatorSize.height), DEFAULT_SLIDER_DEPTH);
103 float mMinPosition; ///< The minimum scroll position
104 float mMaxPosition; ///< The maximum scroll position
107 } // unnamed namespace
115 const Property::Index ScrollBar::PROPERTY_INDICATOR_HEIGHT_POLICY( Internal::ScrollBar::SCROLLBAR_PROPERTY_START_INDEX );
116 const Property::Index ScrollBar::PROPERTY_INDICATOR_FIXED_HEIGHT( Internal::ScrollBar::SCROLLBAR_PROPERTY_START_INDEX + 1 );
124 using namespace Dali;
126 const char* INDICATOR_HEIGHT_POLICY_NAME[] = {"Variable", "Fixed"};
130 return Toolkit::ScrollBar::New();
133 TypeRegistration typeRegistration( typeid(Toolkit::ScrollBar), typeid(Toolkit::ScrollComponent), Create );
135 PropertyRegistration property1( typeRegistration, "indicator-height-policy", Toolkit::ScrollBar::PROPERTY_INDICATOR_HEIGHT_POLICY, Property::STRING, &ScrollBar::SetProperty, &ScrollBar::GetProperty );
136 PropertyRegistration property2( typeRegistration, "indicator-fixed-height", Toolkit::ScrollBar::PROPERTY_INDICATOR_FIXED_HEIGHT, Property::FLOAT, &ScrollBar::SetProperty, &ScrollBar::GetProperty );
139 ScrollBar::ScrollBar()
140 : mScrollStart(0.0f),
142 mCurrentScrollPosition(0.0f),
143 mIndicatorHeightPolicy(Toolkit::ScrollBar::Variable),
144 mIndicatorFixedHeight(DEFAULT_INDICATOR_FIXED_HEIGHT)
148 ScrollBar::~ScrollBar()
152 void ScrollBar::OnInitialize()
156 Image indicatorImage = Image::New( DEFAULT_INDICATOR_IMAGE_PATH );
157 mIndicator = ImageActor::New( indicatorImage );
158 mIndicator.SetNinePatchBorder( DEFAULT_INDICATOR_NINE_PATCH_BORDER );
159 mIndicator.SetStyle( ImageActor::STYLE_NINE_PATCH );
160 mIndicator.SetParentOrigin( ParentOrigin::TOP_LEFT );
161 mIndicator.SetAnchorPoint( AnchorPoint::TOP_LEFT );
162 self.Add(mIndicator);
164 self.SetDrawMode(DrawMode::OVERLAY);
166 // Enable the pan gesture which is attached to the control
167 EnableGestureDetection(Gesture::Type(Gesture::Pan));
170 void ScrollBar::OnScrollConnectorSet( Toolkit::ScrollConnector oldConnector )
174 oldConnector.DomainChangedSignal().Disconnect(this, &ScrollBar::OnScrollDomainChanged);
176 mScrollPositionObject.Reset();
179 if( mScrollConnector )
181 mScrollPositionObject = mScrollConnector.GetScrollPositionObject();
184 mScrollConnector.DomainChangedSignal().Connect(this, &ScrollBar::OnScrollDomainChanged);
188 void ScrollBar::SetBackgroundImage( Image image, const Vector4& border )
192 mBackground = ImageActor::New( image );
193 mBackground.SetParentOrigin( ParentOrigin::TOP_LEFT );
194 mBackground.SetAnchorPoint( AnchorPoint::TOP_LEFT );
195 Self().Add(mBackground);
199 mBackground.SetImage(image);
202 mBackground.SetNinePatchBorder( border );
203 mBackground.SetStyle( ImageActor::STYLE_NINE_PATCH );
206 void ScrollBar::SetIndicatorImage( Image image, const Vector4& border )
208 mIndicator.SetImage(image);
209 mIndicator.SetNinePatchBorder( border );
210 mIndicator.SetStyle( ImageActor::STYLE_NINE_PATCH );
213 Actor ScrollBar::GetScrollIndicator()
218 void ScrollBar::ApplyConstraints()
220 if( mScrollConnector )
224 Constraint constraint;
226 if(mIndicatorSizeConstraint)
228 self.RemoveConstraint(mIndicatorSizeConstraint);
231 // Set indicator height according to the indicator's height policy
232 if(mIndicatorHeightPolicy == Toolkit::ScrollBar::Fixed)
234 mIndicator.SetSize(Self().GetCurrentSize().width, mIndicatorFixedHeight);
238 constraint = Constraint::New<Vector3>( Actor::SIZE,
239 ParentSource( Actor::SIZE ),
240 IndicatorSizeConstraint( mScrollConnector.GetContentLength() ) );
241 mIndicatorSizeConstraint = mIndicator.ApplyConstraint( constraint );
244 if(mIndicatorPositionConstraint)
246 self.RemoveConstraint(mIndicatorPositionConstraint);
249 constraint = Constraint::New<Vector3>( Actor::POSITION,
250 LocalSource( Actor::SIZE ),
251 ParentSource( Actor::SIZE ),
252 Source( mScrollPositionObject, Toolkit::ScrollConnector::SCROLL_POSITION ),
253 IndicatorPositionConstraint( mScrollConnector.GetMinLimit(), mScrollConnector.GetMaxLimit() ) );
254 mIndicatorPositionConstraint = mIndicator.ApplyConstraint( constraint );
258 mBackground.RemoveConstraints();
260 constraint = Constraint::New<Vector3>(Actor::SIZE,
261 ParentSource(Actor::SIZE),
262 EqualToConstraint());
263 mBackground.ApplyConstraint(constraint);
268 void ScrollBar::SetPositionNotifications( const std::vector<float>& positions )
270 if(mScrollPositionObject)
272 if(mPositionNotification)
274 mScrollPositionObject.RemovePropertyNotification(mPositionNotification);
276 mPositionNotification = mScrollPositionObject.AddPropertyNotification( Toolkit::ScrollConnector::SCROLL_POSITION, VariableStepCondition(positions) );
277 mPositionNotification.NotifySignal().Connect( this, &ScrollBar::OnScrollPositionNotified );
281 void ScrollBar::OnScrollPositionNotified(PropertyNotification& source)
283 // Emit the signal to notify the scroll position crossing
284 mScrollPositionNotifiedSignal.Emit(mScrollPositionObject.GetProperty<float>( Toolkit::ScrollConnector::SCROLL_POSITION ));
287 void ScrollBar::Show()
289 // Cancel any animation
296 mAnimation = Animation::New( INDICATOR_SHOW_TIME );
297 mAnimation.OpacityTo( Self(), 1.0f, AlphaFunctions::EaseIn );
301 void ScrollBar::Hide()
303 // Cancel any animation
310 mAnimation = Animation::New( INDICATOR_HIDE_TIME );
311 mAnimation.OpacityTo( Self(), 0.0f, AlphaFunctions::EaseIn );
315 bool ScrollBar::OnPanGestureProcessTick()
317 // Update the scroll position property.
318 mScrollPositionObject.SetProperty( Toolkit::ScrollConnector::SCROLL_POSITION, mCurrentScrollPosition );
320 Dali::Toolkit::ItemView itemView = Dali::Toolkit::ItemView::DownCast(Self().GetParent());
323 // Refresh ItemView immediately when the scroll position is changed.
324 GetImpl(itemView).DoRefresh(mCurrentScrollPosition, false); // No need to cache extra items.
330 void ScrollBar::OnPan( PanGesture gesture )
332 if(mScrollPositionObject)
334 switch(gesture.state)
336 case Gesture::Started:
340 // Make sure the pan gesture is only being processed once per frame.
341 mTimer = Timer::New( DEFAULT_PAN_GESTURE_PROCESS_TIME );
342 mTimer.TickSignal().Connect( this, &ScrollBar::OnPanGestureProcessTick );
347 mScrollStart = mScrollPositionObject.GetProperty<float>( Toolkit::ScrollConnector::SCROLL_POSITION );
348 mGestureDisplacement = Vector3::ZERO;
353 case Gesture::Continuing:
355 Vector3 delta(gesture.displacement.x, gesture.displacement.y, 0.0f);
356 mGestureDisplacement+=delta;
358 Vector3 span = Self().GetCurrentSize() - mIndicator.GetCurrentSize();
359 const float domainSize = fabs(mScrollConnector.GetMaxLimit() - mScrollConnector.GetMinLimit());
360 mCurrentScrollPosition = mScrollStart - mGestureDisplacement.y * domainSize / span.y;
361 mCurrentScrollPosition = std::min(mScrollConnector.GetMaxLimit(), std::max(mCurrentScrollPosition, mScrollConnector.GetMinLimit()));
371 // Destroy the timer when pan gesture is finished.
373 mTimer.TickSignal().Disconnect( this, &ScrollBar::OnPanGestureProcessTick );
381 Dali::Toolkit::ItemView itemView = Dali::Toolkit::ItemView::DownCast(Self().GetParent());
384 // Disable automatic refresh in ItemView during fast scrolling
385 GetImpl(itemView).SetRefreshEnabled(!mIsPanning);
390 void ScrollBar::OnScrollDomainChanged(float minPosition, float maxPosition, float contentSize)
392 // Reapply constraints when the scroll domain is changed
396 void ScrollBar::SetIndicatorHeightPolicy( Toolkit::ScrollBar::IndicatorHeightPolicy policy )
398 mIndicatorHeightPolicy = policy;
402 Toolkit::ScrollBar::IndicatorHeightPolicy ScrollBar::GetIndicatorHeightPolicy()
404 return mIndicatorHeightPolicy;
407 void ScrollBar::SetIndicatorFixedHeight( float height )
409 mIndicatorFixedHeight = height;
413 float ScrollBar::GetIndicatorFixedHeight()
415 return mIndicatorFixedHeight;
418 void ScrollBar::OnIndicatorHeightPolicyPropertySet( Property::Value propertyValue )
420 std::string policyName( propertyValue.Get<std::string>() );
421 if(policyName == "Variable")
423 SetIndicatorHeightPolicy(Toolkit::ScrollBar::Variable);
425 else if(policyName == "Fixed")
427 SetIndicatorHeightPolicy(Toolkit::ScrollBar::Fixed);
431 DALI_ASSERT_ALWAYS( !"ScrollBar::OnIndicatorHeightPolicyPropertySet(). Invalid Property value." );
435 void ScrollBar::SetProperty( BaseObject* object, Property::Index index, const Property::Value& value )
437 Toolkit::ScrollBar scrollBar = Toolkit::ScrollBar::DownCast( Dali::BaseHandle( object ) );
441 ScrollBar& scrollBarImpl( GetImpl( scrollBar ) );
444 case Toolkit::ScrollBar::PROPERTY_INDICATOR_HEIGHT_POLICY:
446 scrollBarImpl.OnIndicatorHeightPolicyPropertySet( value );
449 case Toolkit::ScrollBar::PROPERTY_INDICATOR_FIXED_HEIGHT:
451 scrollBarImpl.SetIndicatorFixedHeight(value.Get<float>());
458 Property::Value ScrollBar::GetProperty( BaseObject* object, Property::Index index )
460 Property::Value value;
462 Toolkit::ScrollBar scrollBar = Toolkit::ScrollBar::DownCast( Dali::BaseHandle( object ) );
466 ScrollBar& scrollBarImpl( GetImpl( scrollBar ) );
469 case Toolkit::ScrollBar::PROPERTY_INDICATOR_HEIGHT_POLICY:
471 value = INDICATOR_HEIGHT_POLICY_NAME[ scrollBarImpl.GetIndicatorHeightPolicy() ];
474 case Toolkit::ScrollBar::PROPERTY_INDICATOR_FIXED_HEIGHT:
476 value = scrollBarImpl.GetIndicatorFixedHeight();
484 Toolkit::ScrollBar ScrollBar::New()
486 // Create the implementation, temporarily owned by this handle on stack
487 IntrusivePtr< ScrollBar > impl = new ScrollBar();
489 // Pass ownership to CustomActor handle
490 Toolkit::ScrollBar handle( *impl );
492 // Second-phase init of the implementation
493 // This can only be done after the CustomActor connection has been made...
499 } // namespace Internal
501 } // namespace Toolkit