2 * Copyright (c) 2018 Samsung Electronics Co., Ltd.
4 * Licensed under the Apache License, Version 2.0 (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://www.apache.org/licenses/LICENSE-2.0
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.
18 #include <dali-toolkit/devel-api/layouting/layout-group-impl.h>
21 #include <dali/public-api/object/type-registry-helper.h>
22 #include <dali/devel-api/actors/actor-devel.h>
23 #include <dali/devel-api/object/handle-devel.h>
24 #include <dali/integration-api/debug.h>
27 #include <dali-toolkit/internal/layouting/layout-group-data-impl.h>
28 #include <dali-toolkit/public-api/controls/control-impl.h>
29 #include <dali-toolkit/internal/controls/control/control-data-impl.h>
30 #include <dali-toolkit/internal/layouting/size-negotiation-mapper.h>
34 #if defined(DEBUG_ENABLED)
35 Debug::Filter* gLogFilter = Debug::Filter::New( Debug::NoLogging, false, "LOG_LAYOUT" );
46 LayoutGroup::LayoutGroup()
47 : mImpl( new LayoutGroup::Impl() ),
52 LayoutGroupPtr LayoutGroup::New( Handle& owner )
54 LayoutGroupPtr layoutPtr = new LayoutGroup();
58 LayoutGroup::~LayoutGroup()
60 // An object with a unique_ptr to an opaque structure must define it's destructor in the translation unit
61 // where the opaque structure is defined. It cannot use the default method in the header file.
64 Toolkit::LayoutGroup::LayoutId LayoutGroup::Add( LayoutItem& child )
66 LayoutParent* oldParent = child.GetParent();
69 LayoutGroupPtr parentGroup( dynamic_cast< LayoutGroup* >( oldParent ) );
72 parentGroup->Remove( child );
76 Impl::ChildLayout childLayout;
77 childLayout.layoutId = mImpl->mNextLayoutId++;
78 childLayout.child = &child;
79 mImpl->mChildren.emplace_back( childLayout );
81 child.SetParent( this );
83 auto owner = child.GetOwner();
85 // If the owner does not have any LayoutItem child properties, add them
86 if( ! DevelHandle::DoesCustomPropertyExist( owner, Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION ) )
88 // Set default properties for LayoutGroup and LayoutItem.
89 // Deriving classes can override OnChildAdd() to add their own default properties
90 GenerateDefaultChildPropertyValues( owner );
93 // Inform deriving classes that this child has been added
94 OnChildAdd( *childLayout.child.Get() );
96 // Now listen to future changes to the child properties.
97 DevelHandle::PropertySetSignal(owner).Connect( this, &LayoutGroup::OnSetChildProperties );
101 return childLayout.layoutId;
104 void LayoutGroup::Remove( Toolkit::LayoutGroup::LayoutId childId )
106 for( auto iter = mImpl->mChildren.begin() ; iter != mImpl->mChildren.end() ; ++iter )
108 if( iter->layoutId == childId )
110 RemoveChild( *iter->child.Get() );
111 mImpl->mChildren.erase(iter);
118 void LayoutGroup::Remove( LayoutItem& child )
120 for( auto iter = mImpl->mChildren.begin() ; iter != mImpl->mChildren.end() ; ++iter )
122 if( iter->child.Get() == &child )
124 RemoveChild( *iter->child.Get() );
125 mImpl->mChildren.erase(iter);
132 Toolkit::LayoutGroup::LayoutId LayoutGroup::Insert( LayoutItem& target, LayoutItem& child )
134 LayoutParent* oldParent = child.GetParent();
137 LayoutGroupPtr parentGroup( dynamic_cast< LayoutGroup* >( oldParent ) );
140 parentGroup->Remove( child );
144 // Find target position
145 std::vector< Impl::ChildLayout >::iterator position;
146 for( auto iter = mImpl->mChildren.begin(); iter != mImpl->mChildren.end(); ++iter )
148 if( iter->child.Get() == &target )
155 Impl::ChildLayout childLayout;
156 childLayout.layoutId = mImpl->mNextLayoutId++;
157 childLayout.child = &child;
158 mImpl->mChildren.insert( position, childLayout );
160 child.SetParent( this );
162 auto owner = child.GetOwner();
164 // Inform deriving classes that this child has been added
165 OnChildAdd( *childLayout.child.Get() );
167 // Now listen to future changes to the child properties.
168 DevelHandle::PropertySetSignal(owner).Connect( this, &LayoutGroup::OnSetChildProperties );
172 return childLayout.layoutId;
175 Toolkit::LayoutGroup::LayoutId LayoutGroup::Move( LayoutItem& target, LayoutItem& child )
177 // Remove child from the previous position
178 for( auto iter = mImpl->mChildren.begin() ; iter != mImpl->mChildren.end() ; ++iter )
180 if( iter->child.Get() == &child )
182 mImpl->mChildren.erase( iter );
187 // Find target position
188 std::vector< Impl::ChildLayout >::iterator position;
189 for( auto iter = mImpl->mChildren.begin(); iter != mImpl->mChildren.end(); ++iter )
191 if( iter->child.Get() == &target )
198 Impl::ChildLayout childLayout;
199 childLayout.layoutId = mImpl->mNextLayoutId++;
200 childLayout.child = &child;
201 mImpl->mChildren.insert( position, childLayout );
205 return childLayout.layoutId;
208 Toolkit::LayoutGroup::LayoutId LayoutGroup::MoveBack( LayoutItem& child )
210 // Remove child from the previous position
211 for( auto iter = mImpl->mChildren.begin() ; iter != mImpl->mChildren.end() ; ++iter )
213 if( iter->child.Get() == &child )
215 mImpl->mChildren.erase( iter );
220 Impl::ChildLayout childLayout;
221 childLayout.layoutId = mImpl->mNextLayoutId++;
222 childLayout.child = &child;
223 mImpl->mChildren.emplace_back( childLayout );
227 return childLayout.layoutId;
230 void LayoutGroup::RemoveAll()
232 for( auto iter = mImpl->mChildren.begin() ; iter != mImpl->mChildren.end() ; )
234 RemoveChild( *iter->child.Get() );
235 iter = mImpl->mChildren.erase(iter);
239 unsigned int LayoutGroup::GetChildCount() const
241 return mImpl->mChildren.size();
244 LayoutItemPtr LayoutGroup::GetChildAt( unsigned int index ) const
246 DALI_ASSERT_ALWAYS( index < mImpl->mChildren.size() );
247 return mImpl->mChildren[ index ].child;
250 LayoutItemPtr LayoutGroup::GetChild( Toolkit::LayoutGroup::LayoutId childId ) const
252 for( auto&& childLayout : mImpl->mChildren )
254 if( childLayout.layoutId == childId )
256 return childLayout.child;
262 Toolkit::LayoutGroup::LayoutId LayoutGroup::GetChildId( LayoutItem& child ) const
264 for( auto&& childLayout : mImpl->mChildren )
266 if( childLayout.child.Get() == &child )
268 return childLayout.layoutId;
271 return Toolkit::LayoutGroup::UNKNOWN_ID;
274 void LayoutGroup::OnChildAdd( LayoutItem& child )
278 void LayoutGroup::OnChildRemove( LayoutItem& child )
282 void LayoutGroup::DoInitialize()
286 void LayoutGroup::DoRegisterChildProperties( const std::string& containerType )
290 void LayoutGroup::OnSetChildProperties( Handle& handle, Property::Index index, Property::Value value )
292 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup::OnSetChildProperties property(" << handle.GetPropertyName(index) << ")\n" );
294 if ( ( ( index >= CHILD_PROPERTY_REGISTRATION_START_INDEX ) &&
295 ( index <= CHILD_PROPERTY_REGISTRATION_MAX_INDEX ) )
297 ( index == Toolkit::Control::Property::MARGIN || index == Toolkit::Control::Property::PADDING ) )
299 // If any child properties are set, must perform relayout
300 for( auto&& child : mImpl->mChildren )
302 if( child.child->GetOwner() == handle )
304 child.child->RequestLayout();
311 void LayoutGroup::GenerateDefaultChildPropertyValues( Handle child )
313 child.SetProperty( Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION,
314 Toolkit::ChildLayoutData::WRAP_CONTENT );
315 child.SetProperty( Toolkit::LayoutItem::ChildProperty::HEIGHT_SPECIFICATION,
316 Toolkit::ChildLayoutData::WRAP_CONTENT );
319 void LayoutGroup::MeasureChildren( MeasureSpec widthMeasureSpec, MeasureSpec heightMeasureSpec)
321 for( auto&& child : mImpl->mChildren )
323 //if( (child.mViewFlags & Impl::VISIBILITY_MASK) != Impl::GONE ) // Use owner visibility/enabled/ready
325 MeasureChild( child.child, widthMeasureSpec, heightMeasureSpec );
330 void LayoutGroup::MeasureChild( LayoutItemPtr child,
331 MeasureSpec parentWidthMeasureSpec,
332 MeasureSpec parentHeightMeasureSpec )
334 DALI_LOG_TRACE_METHOD( gLogFilter );
336 auto childOwner = child->GetOwner();
338 auto control = Toolkit::Control::DownCast( childOwner );
340 #if defined( DEBUG_ENABLED )
343 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::MeasureChild(%s) natural size(%f, %f)\n",
344 control.GetName().c_str(), control.GetNaturalSize().width, control.GetNaturalSize().height );
349 // Get last stored width and height specifications for the child
350 auto desiredWidth = childOwner.GetProperty<int>( Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION );
351 auto desiredHeight = childOwner.GetProperty<int>( Toolkit::LayoutItem::ChildProperty::HEIGHT_SPECIFICATION );
352 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::MeasureChild desiredWidth(%d) desiredHeight(%d)\n", desiredWidth, desiredHeight );
354 auto padding = GetPadding(); // Padding of this layout's owner, not of the child being measured.
356 const MeasureSpec childWidthMeasureSpec = GetChildMeasureSpec( parentWidthMeasureSpec,
357 padding.start + padding.end,
359 const MeasureSpec childHeightMeasureSpec = GetChildMeasureSpec( parentHeightMeasureSpec,
360 padding.top + padding.bottom,
363 child->Measure( childWidthMeasureSpec, childHeightMeasureSpec );
366 void LayoutGroup::MeasureChildWithMargins( LayoutItemPtr child,
367 MeasureSpec parentWidthMeasureSpec, LayoutLength widthUsed,
368 MeasureSpec parentHeightMeasureSpec, LayoutLength heightUsed)
370 auto childOwner = child->GetOwner();
371 auto desiredWidth = childOwner.GetProperty<int>( Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION );
372 auto desiredHeight = childOwner.GetProperty<int>( Toolkit::LayoutItem::ChildProperty::HEIGHT_SPECIFICATION );
374 auto padding = GetPadding(); // Padding of this layout's owner, not of the child being measured.
376 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::MeasureChildWithMargins desiredWidth(%d)\n", desiredWidth );
378 MeasureSpec childWidthMeasureSpec = GetChildMeasureSpec( parentWidthMeasureSpec,
379 LayoutLength( padding.start + padding.end ) +
380 widthUsed, desiredWidth );
382 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::MeasureChildWithMargins desiredHeight(%d)\n", desiredHeight );
384 MeasureSpec childHeightMeasureSpec = GetChildMeasureSpec( parentHeightMeasureSpec,
385 LayoutLength( padding.top + padding.bottom )+
386 heightUsed, desiredHeight );
388 child->Measure( childWidthMeasureSpec, childHeightMeasureSpec );
392 MeasureSpec LayoutGroup::GetChildMeasureSpec(
393 MeasureSpec measureSpec,
394 LayoutLength padding,
395 LayoutLength childDimension )
397 auto specMode = measureSpec.GetMode();
398 LayoutLength specSize = measureSpec.GetSize();
400 LayoutLength size = std::max( LayoutLength(0), specSize - padding ); // reduce available size by the owners padding
402 LayoutLength resultSize = 0;
403 MeasureSpec::Mode resultMode = MeasureSpec::Mode::UNSPECIFIED;
407 // Parent has imposed an exact size on us
408 case MeasureSpec::Mode::EXACTLY:
410 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec MeasureSpec::Mode::EXACTLY\n");
411 if (childDimension == Toolkit::ChildLayoutData::MATCH_PARENT)
413 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec childDimension MATCH_PARENT\n");
415 // Child wants to be our size. So be it.
417 resultMode = MeasureSpec::Mode::EXACTLY;
419 else if (childDimension == Toolkit::ChildLayoutData::WRAP_CONTENT)
421 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec childDimension WRAP_CONTENT\n");
423 // Child wants to determine its own size. It can't be
426 resultMode = MeasureSpec::Mode::AT_MOST;
430 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec childDimension UNSPECIFIED\n");
431 resultSize = childDimension;
432 resultMode = MeasureSpec::Mode::EXACTLY;
438 // Parent has imposed a maximum size on us
439 case MeasureSpec::Mode::AT_MOST:
441 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec MeasureSpec::Mode::AT_MOST\n");
442 if (childDimension == Toolkit::ChildLayoutData::MATCH_PARENT)
444 // Child wants to be our size, but our size is not fixed.
445 // Constrain child to not be bigger than us.
447 resultMode = MeasureSpec::Mode::AT_MOST;
449 else if (childDimension == Toolkit::ChildLayoutData::WRAP_CONTENT)
451 // Child wants to determine its own size. It can't be
454 resultMode = MeasureSpec::Mode::AT_MOST;
458 // Child wants a specific size... so be it
459 resultSize = childDimension + padding;
460 resultMode = MeasureSpec::Mode::EXACTLY;
466 // Parent asked to see how big we want to be
467 case MeasureSpec::Mode::UNSPECIFIED:
469 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec MeasureSpec::Mode::UNSPECIFIED\n");
471 if (childDimension == Toolkit::ChildLayoutData::MATCH_PARENT)
473 // Child wants to be our size... find out how big it should be
474 resultSize = LayoutItem::Impl::sUseZeroUnspecifiedMeasureSpec ? LayoutLength(0) : size;
475 resultMode = MeasureSpec::Mode::UNSPECIFIED;
477 else if (childDimension == Toolkit::ChildLayoutData::WRAP_CONTENT)
479 // Child wants to determine its own size.... find out how big
481 resultSize = LayoutItem::Impl::sUseZeroUnspecifiedMeasureSpec ? LayoutLength(0) : size;
482 resultMode = MeasureSpec::Mode::UNSPECIFIED;
486 // Child wants a specific size... let him have it
487 resultSize = childDimension + padding;
488 resultMode = MeasureSpec::Mode::EXACTLY;
494 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec resultSize(" << resultSize << ")\n" );
496 //noinspection ResourceType
497 return MeasureSpec( resultSize, resultMode );
501 void LayoutGroup::OnInitialize()
503 auto control = Toolkit::Control::DownCast( GetOwner() );
507 // Take ownership of existing children
508 for( unsigned int childIndex = 0 ; childIndex < control.GetChildCount(); ++childIndex )
510 ChildAddedToOwner( control.GetChildAt( childIndex ) );
513 DevelActor::ChildAddedSignal( control ).Connect( mSlotDelegate, &LayoutGroup::ChildAddedToOwner );
514 DevelActor::ChildRemovedSignal( control ).Connect( mSlotDelegate, &LayoutGroup::ChildRemovedFromOwner );
515 DevelActor::ChildOrderChangedSignal( control ).Connect( mSlotDelegate, &LayoutGroup::ChildOrderChanged );
516 DevelHandle::PropertySetSignal( control ).Connect( mSlotDelegate, &LayoutGroup::OnOwnerPropertySet );
518 if( control.GetParent() )
520 auto parent = Toolkit::Control::DownCast( control.GetParent() );
523 auto parentLayout = Toolkit::LayoutGroup::DownCast( DevelControl::GetLayout( parent ) );
526 Internal::LayoutGroup& parentLayoutImpl = GetImplementation( parentLayout );
528 unsigned int count = parent.GetChildCount();
529 unsigned int index = static_cast< unsigned int >( control.GetProperty< int >( DevelActor::Property::SIBLING_ORDER ) );
531 // Find insertion position
532 while( ++index < count )
534 auto sibling = Toolkit::Control::DownCast( parent.GetChildAt( index ) );
537 auto siblingLayout = DevelControl::GetLayout( sibling );
540 Internal::LayoutItem& siblingLayoutImpl = GetImplementation( siblingLayout );
541 parentLayoutImpl.Insert( siblingLayoutImpl, *this );
549 parentLayoutImpl.Add( *this );
557 void LayoutGroup::OnRegisterChildProperties( const std::string& containerType )
559 DoRegisterChildProperties( containerType );
562 void LayoutGroup::OnUnparent()
567 auto control = Toolkit::Control::DownCast( GetOwner() );
570 DevelActor::ChildAddedSignal( control ).Disconnect( mSlotDelegate, &LayoutGroup::ChildAddedToOwner );
571 DevelActor::ChildRemovedSignal( control ).Disconnect( mSlotDelegate, &LayoutGroup::ChildRemovedFromOwner );
572 DevelActor::ChildOrderChangedSignal( control ).Disconnect( mSlotDelegate, &LayoutGroup::ChildOrderChanged );
573 DevelHandle::PropertySetSignal( control ).Disconnect( mSlotDelegate, &LayoutGroup::OnOwnerPropertySet );
577 void LayoutGroup::RemoveChild( LayoutItem& item )
579 item.SetParent( nullptr );
580 OnChildRemove( item );
583 void LayoutGroup::ChildAddedToOwner( Actor child )
585 LayoutItemPtr childLayout;
586 Toolkit::Control control = Toolkit::Control::DownCast( child );
588 #if defined(DEBUG_ENABLED)
589 auto parent = Toolkit::Control::DownCast( GetOwner() );
590 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::ChildAddedToOwner child control(%s) owner control(%s)\n",
591 control?control.GetName().c_str():"Invalid",
592 parent?parent.GetName().c_str():"Invalid" );
595 if( control ) // Can only support adding Controls, not Actors to layout
597 Internal::Control& childControlImpl = GetImplementation( control );
598 Internal::Control::Impl& childControlDataImpl = Internal::Control::Impl::Get( childControlImpl );
599 childLayout = childControlDataImpl.GetLayout();
603 // If the child doesn't already have a layout, then create a LayoutItem or LayoutGroup for it.
604 // If control behaviour flag set to Layout then set a LayoutGroup.
605 if( DevelControl::IsLayoutingRequired( control ) )
607 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::ChildAddedToOwner Creating default LayoutGroup for control:%s\n",
608 control?control.GetName().c_str():"Invalid" );
609 childLayout = LayoutGroup::New( control );
613 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::ChildAddedToOwner Creating default LayoutItem for control:%s\n",
614 control?control.GetName().c_str():"Invalid" );
615 childLayout = LayoutItem::New( control );
616 childLayout->SetAnimateLayout( IsLayoutAnimated() ); // forces animation inheritance.
619 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup::ChildAddedToOwner child control:" << control.GetName() <<
620 " desiredWidth: " << control.GetNaturalSize().width <<
621 " desiredHeight:" << control.GetNaturalSize().height );
623 childControlDataImpl.SetLayout( *childLayout.Get() );
625 Vector3 size = child.GetTargetSize();
626 // If the size of the control is set explicitly make sure that the control size
627 // stays the same after the layout except it is over written with match parent specs.
630 childLayout->SetMinimumWidth( size.x );
635 childLayout->SetMinimumHeight( size.y );
637 // Default layout data will be generated by Add().
641 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::ChildAddedToOwner child(%s) already has a Layout\n", control.GetName().c_str() );
642 LayoutGroupPtr layoutGroup( dynamic_cast< LayoutGroup* >( childLayout.Get() ) );
645 // Set only in case of leaf children
646 childLayout->SetAnimateLayout( IsLayoutAnimated() );
650 Add( *childLayout.Get() );
654 void LayoutGroup::ChildRemovedFromOwner( Actor child )
656 Toolkit::Control control = Toolkit::Control::DownCast( child );
659 Internal::Control& childControlImpl = GetImplementation( control );
660 Internal::Control::Impl& childControlDataImpl = Internal::Control::Impl::Get( childControlImpl );
661 auto childLayout = childControlDataImpl.GetLayout();
664 Remove( *childLayout.Get() );
669 void LayoutGroup::ChildOrderChanged( Actor child )
671 Toolkit::Control childControl = Toolkit::Control::DownCast( child );
674 Internal::Control& childControlImpl = GetImplementation( childControl );
675 Internal::Control::Impl& childControlDataImpl = Internal::Control::Impl::Get( childControlImpl );
677 auto childLayout = childControlDataImpl.GetLayout();
680 Toolkit::Control control = Toolkit::Control::DownCast( GetOwner() );
681 unsigned int count = control.GetChildCount();
682 unsigned int index = static_cast< unsigned int >( childControl.GetProperty< int >( DevelActor::Property::SIBLING_ORDER ) );
684 // Find insertion position
685 while( ++index < count )
687 auto sibling = Toolkit::Control::DownCast( control.GetChildAt( index ) );
690 auto siblingLayout = DevelControl::GetLayout( sibling );
693 Internal::LayoutItem& siblingLayoutImpl = GetImplementation( siblingLayout );
694 Move( siblingLayoutImpl, *childLayout );
700 MoveBack( *childLayout );
705 void LayoutGroup::OnOwnerPropertySet( Handle& handle, Property::Index index, Property::Value value )
707 DALI_LOG_INFO( gLogFilter, Debug::Concise, "LayoutGroup::OnOwnerPropertySet\n");
708 auto actor = Actor::DownCast( handle );
711 index == Actor::Property::LAYOUT_DIRECTION ||
712 index == Toolkit::Control::Property::PADDING ||
713 index == Toolkit::Control::Property::MARGIN
721 void LayoutGroup::OnAnimationStateChanged( bool animateLayout )
723 // Change children's animation state
724 for( auto&& child : mImpl->mChildren )
726 LayoutGroupPtr parentGroup( dynamic_cast< LayoutGroup* >( child.child.Get() ) );
729 // Change state only in case of leaf children
730 child.child->SetAnimateLayout( animateLayout );
735 void LayoutGroup::OnMeasure( MeasureSpec widthMeasureSpec, MeasureSpec heightMeasureSpec )
737 auto childCount = GetChildCount();
739 DALI_LOG_STREAM( gLogFilter, Debug::Verbose,
740 "LayoutGroup::OnMeasure Actor Id:" << Actor::DownCast(GetOwner()).GetId() <<
741 " Owner:" << Actor::DownCast(GetOwner()).GetName() <<
742 " Child Count:" << childCount <<
743 " MeasureSpecs( width:"<<widthMeasureSpec<<", height:"<<heightMeasureSpec );
745 auto widthMode = widthMeasureSpec.GetMode();
746 auto heightMode = heightMeasureSpec.GetMode();
747 LayoutLength widthSpecSize = widthMeasureSpec.GetSize();
748 LayoutLength heightSpecSize = heightMeasureSpec.GetSize();
750 bool exactWidth ( false );
751 bool exactHeight ( false );
753 // Layouting behaviour
754 // EXACT, width and height as provided.
755 // MATCH_PARENT, width and height that of parent
756 // WRAP_CONTENT, take width of widest child and height size of longest child (within given limit)
757 // UNSPECIFIED, take width of widest child and height size of longest child.
759 LayoutLength layoutWidth( 0 );
760 LayoutLength layoutHeight( 0 );
762 // If LayoutGroup has children then measure children to get max dimensions
763 if ( childCount > 0 )
765 for( unsigned int i=0; i<childCount; ++i )
767 auto childLayout = GetChildAt( i );
770 auto childControl = Toolkit::Control::DownCast(childLayout->GetOwner());
772 // If child control has children check if a ResizePolicy is set on it. A LayoutItem could be a legacy container.
773 // A legacy container would need it's ResizePolicy to be applied as a MeasureSpec.
775 // Check below will be true for legacy containers and controls with layout required set.
776 // Other layouts will have their own OnMeasure (a checked requirement) hence not execute LayoutGroup::OnMeasure.
777 // Controls which have set layout required will not be legacy controls hence should not have a ResizePolicy set.
778 if( childControl.GetChildCount() > 0 )
780 // First pass, Static mappings that are not dependant on parent
781 SizeNegotiationMapper::SetLayoutParametersUsingResizePolicy( childControl, childLayout, Dimension::WIDTH );
782 SizeNegotiationMapper::SetLayoutParametersUsingResizePolicy( childControl, childLayout, Dimension::HEIGHT );
785 // Second pass, if any mappings were not possible due to parent size dependancies then calculate an exact desired size for child
786 if( true == childLayout->IsResizePolicyRequired() ) // No need to test child count as this flag would only be set if control had children.
788 // Get last stored width and height specifications for the child
789 LayoutLength desiredWidth = childControl.GetProperty<float>( Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION );
790 LayoutLength desiredHeight = childControl.GetProperty<float>( Toolkit::LayoutItem::ChildProperty::HEIGHT_SPECIFICATION );
792 DALI_LOG_INFO( gLogFilter, Debug::General, "LayoutGroup::MeasureChild Initial desired size pre ResizePolicy(%f,%f)\n", desiredWidth.AsInteger(), desiredHeight.AsInteger() );
794 childLayout->SetResizePolicyRequired( false ); // clear flag incase in case of changes before next Measure
795 SizeNegotiationMapper::GetSizeofChildForParentDependentResizePolicy( childControl, widthMeasureSpec, heightMeasureSpec, desiredWidth, desiredHeight );
797 // Parent dependant ResizePolicies become exact sizes so are now set on the child before it's measured.
798 childControl.SetProperty( Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION, desiredWidth.AsInteger() );
799 childControl.SetProperty( Toolkit::LayoutItem::ChildProperty::HEIGHT_SPECIFICATION, desiredHeight.AsInteger() );
801 DALI_LOG_INFO( gLogFilter, Debug::General, " LayoutGroup::OnMeasure ResizePolicy Required resulting size(%f,%f)\n", desiredWidth.AsInteger(), desiredHeight.AsInteger() );
805 MeasureChild( childLayout, widthMeasureSpec, heightMeasureSpec );
806 LayoutLength childWidth = childLayout->GetMeasuredWidth();
807 LayoutLength childHeight = childLayout->GetMeasuredHeight();
809 Extents childMargin = childLayout->GetMargin();
810 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup::OnMeasure child " << childControl.GetName().c_str() << " width[" << childWidth << "] height[" << childHeight << "]\n" );
812 layoutWidth = std::max( layoutWidth, childWidth + childMargin.start + childMargin.end );
813 layoutHeight = std::max( layoutHeight, childHeight + childMargin.top + childMargin.bottom );
814 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup::OnMeasure calculated child width[" << layoutWidth << "] height[" << layoutHeight << "]\n" );
818 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::OnMeasure Not a layout\n" );
822 Extents padding = GetPadding();
823 layoutWidth += padding.start + padding.end;
824 layoutHeight += padding.top + padding.bottom;
828 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::OnMeasure Getting default size as a leaf\n" );
829 // LayoutGroup does not contain any children so must be a leaf
830 layoutWidth = GetDefaultSize( GetSuggestedMinimumWidth(), widthMeasureSpec );
831 layoutHeight = GetDefaultSize( GetSuggestedMinimumHeight(), heightMeasureSpec );
834 // Can't exceed specified width
835 if( widthMode == MeasureSpec::Mode::EXACTLY )
839 else if ( widthMode == MeasureSpec::Mode::AT_MOST )
841 layoutWidth = std::min( layoutWidth, widthSpecSize );
844 // Can't exceed specified height
845 if( heightMode == MeasureSpec::Mode::EXACTLY )
849 else if ( heightMode == MeasureSpec::Mode::AT_MOST )
851 layoutHeight = std::min( layoutHeight, heightSpecSize );
854 layoutWidth = std::max( layoutWidth, GetSuggestedMinimumWidth() );
855 layoutHeight = std::max( layoutHeight, GetSuggestedMinimumHeight() );
859 layoutWidth = widthSpecSize;
864 layoutHeight = heightSpecSize;
867 DALI_LOG_STREAM( gLogFilter, Debug::General, "LayoutGroup::OnMeasure Measured size(" << layoutWidth << "," << layoutHeight << ") for : " << Actor::DownCast(GetOwner()).GetName() << " \n" );
868 SetMeasuredDimensions( MeasuredSize( layoutWidth ), MeasuredSize( layoutHeight ) );
871 void LayoutGroup::OnLayout( bool changed, LayoutLength left, LayoutLength top, LayoutLength right, LayoutLength bottom )
873 auto count = GetChildCount();
875 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup OnLayout owner:" << ( ( Toolkit::Control::DownCast(GetOwner())) ? Toolkit::Control::DownCast(GetOwner()).GetName() : "invalid" ) << " childCount:" << count );
877 for( unsigned int childIndex = 0; childIndex < count; childIndex++)
879 LayoutItemPtr childLayout = GetChildAt( childIndex );
880 if( childLayout != nullptr )
883 auto childOwner = childLayout->GetOwner();
884 LayoutLength childWidth = childLayout->GetMeasuredWidth();
885 LayoutLength childHeight = childLayout->GetMeasuredHeight();
886 Extents childMargin = childLayout->GetMargin();
887 auto control = Toolkit::Control::DownCast( childOwner );
888 Extents padding = GetPadding();
890 auto childPosition = control.GetProperty< Vector3 >( Actor::Property::POSITION );
891 auto anchorPoint = control.GetProperty< Vector3 >( Actor::Property::ANCHOR_POINT );
893 DALI_LOG_STREAM( gLogFilter, Debug::General, "LayoutGroup::OnLayout child[" << control.GetName() <<
894 "] position(" << childPosition << ") child width[" << childWidth << "] height[" << childHeight << "]\n" );
896 // Margin and Padding only supported when child anchor point is TOP_LEFT.
897 int paddingAndMarginOffsetX = ( AnchorPoint::TOP_LEFT == anchorPoint ) ? ( padding.top + childMargin.top ) : 0;
898 int paddingAndMarginOffsetY = ( AnchorPoint::TOP_LEFT == anchorPoint ) ? ( padding.start + childMargin.start ) : 0;
899 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::OnLayout paddingMargin offset(%d,%d)\n", paddingAndMarginOffsetX, paddingAndMarginOffsetY );
901 LayoutLength childLeft = childPosition.x + paddingAndMarginOffsetX;
902 LayoutLength childTop = childPosition.y + paddingAndMarginOffsetY;
904 childLayout->Layout( childLeft, childTop, childLeft + childWidth, childTop + childHeight );
910 } // namespace Internal
911 } // namespace Toolkit