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.
65 Toolkit::LayoutGroup::LayoutId LayoutGroup::Add( LayoutItem& child )
67 LayoutParent* oldParent = child.GetParent();
70 LayoutGroupPtr parentGroup( dynamic_cast< LayoutGroup* >( oldParent ) );
73 parentGroup->Remove( child );
77 Impl::ChildLayout childLayout;
78 childLayout.layoutId = mImpl->mNextLayoutId++;
79 childLayout.child = &child;
80 mImpl->mChildren.emplace_back( childLayout );
82 child.SetParent( this );
84 auto owner = child.GetOwner();
86 // If the owner does not have any LayoutItem child properties, add them
87 if( ! DevelHandle::DoesCustomPropertyExist( owner, Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION ) )
89 // Set default properties for LayoutGroup and LayoutItem.
90 // Deriving classes can override OnChildAdd() to add their own default properties
91 GenerateDefaultChildPropertyValues( owner );
94 // Inform deriving classes that this child has been added
95 OnChildAdd( *childLayout.child.Get() );
97 // Now listen to future changes to the child properties.
98 DevelHandle::PropertySetSignal(owner).Connect( this, &LayoutGroup::OnSetChildProperties );
102 return childLayout.layoutId;
105 void LayoutGroup::Remove( Toolkit::LayoutGroup::LayoutId childId )
107 for( auto iter = mImpl->mChildren.begin() ; iter != mImpl->mChildren.end() ; ++iter )
109 if( iter->layoutId == childId )
111 RemoveChild( *iter->child.Get() );
112 mImpl->mChildren.erase(iter);
119 void LayoutGroup::Remove( LayoutItem& child )
121 for( auto iter = mImpl->mChildren.begin() ; iter != mImpl->mChildren.end() ; ++iter )
123 if( iter->child.Get() == &child )
125 RemoveChild( *iter->child.Get() );
126 mImpl->mChildren.erase(iter);
133 Toolkit::LayoutGroup::LayoutId LayoutGroup::Insert( LayoutItem& target, LayoutItem& child )
135 LayoutParent* oldParent = child.GetParent();
138 LayoutGroupPtr parentGroup( dynamic_cast< LayoutGroup* >( oldParent ) );
141 parentGroup->Remove( child );
145 // Find target position
146 std::vector< Impl::ChildLayout >::iterator position;
147 for( auto iter = mImpl->mChildren.begin(); iter != mImpl->mChildren.end(); ++iter )
149 if( iter->child.Get() == &target )
156 Impl::ChildLayout childLayout;
157 childLayout.layoutId = mImpl->mNextLayoutId++;
158 childLayout.child = &child;
159 mImpl->mChildren.insert( position, childLayout );
161 child.SetParent( this );
163 auto owner = child.GetOwner();
165 // Inform deriving classes that this child has been added
166 OnChildAdd( *childLayout.child.Get() );
168 // Now listen to future changes to the child properties.
169 DevelHandle::PropertySetSignal(owner).Connect( this, &LayoutGroup::OnSetChildProperties );
173 return childLayout.layoutId;
176 void LayoutGroup::RemoveAll()
178 for( auto iter = mImpl->mChildren.begin() ; iter != mImpl->mChildren.end() ; )
180 RemoveChild( *iter->child.Get() );
181 iter = mImpl->mChildren.erase(iter);
185 unsigned int LayoutGroup::GetChildCount() const
187 return mImpl->mChildren.size();
190 LayoutItemPtr LayoutGroup::GetChildAt( unsigned int index ) const
192 DALI_ASSERT_ALWAYS( index < mImpl->mChildren.size() );
193 return mImpl->mChildren[ index ].child;
196 LayoutItemPtr LayoutGroup::GetChild( Toolkit::LayoutGroup::LayoutId childId ) const
198 for( auto&& childLayout : mImpl->mChildren )
200 if( childLayout.layoutId == childId )
202 return childLayout.child;
208 Toolkit::LayoutGroup::LayoutId LayoutGroup::GetChildId( LayoutItem& child ) const
210 for( auto&& childLayout : mImpl->mChildren )
212 if( childLayout.child.Get() == &child )
214 return childLayout.layoutId;
217 return Toolkit::LayoutGroup::UNKNOWN_ID;
220 void LayoutGroup::OnChildAdd( LayoutItem& child )
224 void LayoutGroup::OnChildRemove( LayoutItem& child )
228 void LayoutGroup::DoInitialize()
232 void LayoutGroup::DoRegisterChildProperties( const std::string& containerType )
236 void LayoutGroup::OnSetChildProperties( Handle& handle, Property::Index index, Property::Value value )
238 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup::OnSetChildProperties property(" << handle.GetPropertyName(index) << ")\n" );
240 if ( ( ( index >= CHILD_PROPERTY_REGISTRATION_START_INDEX ) &&
241 ( index <= CHILD_PROPERTY_REGISTRATION_MAX_INDEX ) )
243 ( index == Toolkit::Control::Property::MARGIN || index == Toolkit::Control::Property::PADDING ) )
245 // If any child properties are set, must perform relayout
246 for( auto&& child : mImpl->mChildren )
248 if( child.child->GetOwner() == handle )
250 child.child->RequestLayout();
257 void LayoutGroup::GenerateDefaultChildPropertyValues( Handle child )
259 child.SetProperty( Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION,
260 Toolkit::ChildLayoutData::WRAP_CONTENT );
261 child.SetProperty( Toolkit::LayoutItem::ChildProperty::HEIGHT_SPECIFICATION,
262 Toolkit::ChildLayoutData::WRAP_CONTENT );
265 void LayoutGroup::MeasureChildren( MeasureSpec widthMeasureSpec, MeasureSpec heightMeasureSpec)
267 for( auto&& child : mImpl->mChildren )
269 //if( (child.mViewFlags & Impl::VISIBILITY_MASK) != Impl::GONE ) // Use owner visibility/enabled/ready
271 MeasureChild( child.child, widthMeasureSpec, heightMeasureSpec );
276 void LayoutGroup::MeasureChild( LayoutItemPtr child,
277 MeasureSpec parentWidthMeasureSpec,
278 MeasureSpec parentHeightMeasureSpec )
280 DALI_LOG_TRACE_METHOD( gLogFilter );
282 auto childOwner = child->GetOwner();
284 auto control = Toolkit::Control::DownCast( childOwner );
286 #if defined( DEBUG_ENABLED )
289 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::MeasureChild(%s) natural size(%f, %f)\n",
290 control.GetName().c_str(), control.GetNaturalSize().width, control.GetNaturalSize().height );
295 // Get last stored width and height specifications for the child
296 auto desiredWidth = childOwner.GetProperty<int>( Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION );
297 auto desiredHeight = childOwner.GetProperty<int>( Toolkit::LayoutItem::ChildProperty::HEIGHT_SPECIFICATION );
298 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::MeasureChild desiredWidth(%d) desiredHeight(%d)\n", desiredWidth, desiredHeight );
300 auto padding = GetPadding(); // Padding of this layout's owner, not of the child being measured.
302 const MeasureSpec childWidthMeasureSpec = GetChildMeasureSpec( parentWidthMeasureSpec,
303 padding.start + padding.end,
305 const MeasureSpec childHeightMeasureSpec = GetChildMeasureSpec( parentHeightMeasureSpec,
306 padding.top + padding.bottom,
309 child->Measure( childWidthMeasureSpec, childHeightMeasureSpec );
312 void LayoutGroup::MeasureChildWithMargins( LayoutItemPtr child,
313 MeasureSpec parentWidthMeasureSpec, LayoutLength widthUsed,
314 MeasureSpec parentHeightMeasureSpec, LayoutLength heightUsed)
316 auto childOwner = child->GetOwner();
317 auto desiredWidth = childOwner.GetProperty<int>( Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION );
318 auto desiredHeight = childOwner.GetProperty<int>( Toolkit::LayoutItem::ChildProperty::HEIGHT_SPECIFICATION );
320 auto padding = GetPadding(); // Padding of this layout's owner, not of the child being measured.
322 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::MeasureChildWithMargins desiredWidth(%d)\n", desiredWidth );
324 MeasureSpec childWidthMeasureSpec = GetChildMeasureSpec( parentWidthMeasureSpec,
325 LayoutLength( padding.start + padding.end ) +
326 widthUsed, desiredWidth );
328 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::MeasureChildWithMargins desiredHeight(%d)\n", desiredHeight );
330 MeasureSpec childHeightMeasureSpec = GetChildMeasureSpec( parentHeightMeasureSpec,
331 LayoutLength( padding.top + padding.bottom )+
332 heightUsed, desiredHeight );
334 child->Measure( childWidthMeasureSpec, childHeightMeasureSpec );
338 MeasureSpec LayoutGroup::GetChildMeasureSpec(
339 MeasureSpec measureSpec,
340 LayoutLength padding,
341 LayoutLength childDimension )
343 auto specMode = measureSpec.GetMode();
344 LayoutLength specSize = measureSpec.GetSize();
346 LayoutLength size = std::max( LayoutLength(0), specSize - padding ); // reduce available size by the owners padding
348 LayoutLength resultSize = 0;
349 MeasureSpec::Mode resultMode = MeasureSpec::Mode::UNSPECIFIED;
353 // Parent has imposed an exact size on us
354 case MeasureSpec::Mode::EXACTLY:
356 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec MeasureSpec::Mode::EXACTLY\n");
357 if (childDimension == Toolkit::ChildLayoutData::MATCH_PARENT)
359 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec childDimension MATCH_PARENT\n");
361 // Child wants to be our size. So be it.
363 resultMode = MeasureSpec::Mode::EXACTLY;
365 else if (childDimension == Toolkit::ChildLayoutData::WRAP_CONTENT)
367 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec childDimension WRAP_CONTENT\n");
369 // Child wants to determine its own size. It can't be
372 resultMode = MeasureSpec::Mode::AT_MOST;
376 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec childDimension UNSPECIFIED\n");
377 resultSize = childDimension;
378 resultMode = MeasureSpec::Mode::EXACTLY;
384 // Parent has imposed a maximum size on us
385 case MeasureSpec::Mode::AT_MOST:
387 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec MeasureSpec::Mode::AT_MOST\n");
388 if (childDimension == Toolkit::ChildLayoutData::MATCH_PARENT)
390 // Child wants to be our size, but our size is not fixed.
391 // Constrain child to not be bigger than us.
393 resultMode = MeasureSpec::Mode::AT_MOST;
395 else if (childDimension == Toolkit::ChildLayoutData::WRAP_CONTENT)
397 // Child wants to determine its own size. It can't be
400 resultMode = MeasureSpec::Mode::AT_MOST;
404 // Child wants a specific size... so be it
405 resultSize = childDimension + padding;
406 resultMode = MeasureSpec::Mode::EXACTLY;
412 // Parent asked to see how big we want to be
413 case MeasureSpec::Mode::UNSPECIFIED:
415 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec MeasureSpec::Mode::UNSPECIFIED\n");
417 if (childDimension == Toolkit::ChildLayoutData::MATCH_PARENT)
419 // Child wants to be our size... find out how big it should be
420 resultSize = LayoutItem::Impl::sUseZeroUnspecifiedMeasureSpec ? LayoutLength(0) : size;
421 resultMode = MeasureSpec::Mode::UNSPECIFIED;
423 else if (childDimension == Toolkit::ChildLayoutData::WRAP_CONTENT)
425 // Child wants to determine its own size.... find out how big
427 resultSize = LayoutItem::Impl::sUseZeroUnspecifiedMeasureSpec ? LayoutLength(0) : size;
428 resultMode = MeasureSpec::Mode::UNSPECIFIED;
432 // Child wants a specific size... let him have it
433 resultSize = childDimension + padding;
434 resultMode = MeasureSpec::Mode::EXACTLY;
440 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec resultSize(" << resultSize << ")\n" );
442 //noinspection ResourceType
443 return MeasureSpec( resultSize, resultMode );
447 void LayoutGroup::OnInitialize()
449 auto control = Toolkit::Control::DownCast( GetOwner() );
453 // Take ownership of existing children
454 for( unsigned int childIndex = 0 ; childIndex < control.GetChildCount(); ++childIndex )
456 ChildAddedToOwnerImpl( control.GetChildAt( childIndex ) );
459 DevelActor::ChildAddedSignal( control ).Connect( mSlotDelegate, &LayoutGroup::ChildAddedToOwner );
460 DevelActor::ChildRemovedSignal( control ).Connect( mSlotDelegate, &LayoutGroup::ChildRemovedFromOwner );
461 DevelHandle::PropertySetSignal( control ).Connect( mSlotDelegate, &LayoutGroup::OnOwnerPropertySet );
463 if( control.GetParent() )
465 auto parent = Toolkit::Control::DownCast( control.GetParent() );
468 auto parentLayout = Toolkit::LayoutGroup::DownCast( DevelControl::GetLayout( parent ) );
471 Internal::LayoutGroup& parentLayoutImpl = GetImplementation( parentLayout );
473 unsigned int count = parent.GetChildCount();
474 unsigned int index = static_cast< unsigned int >( control.GetProperty< int >( DevelActor::Property::SIBLING_ORDER ) );
476 // Find insertion position
477 while( ++index < count )
479 auto sibling = Toolkit::Control::DownCast( parent.GetChildAt( index ) );
482 auto siblingLayout = DevelControl::GetLayout( sibling );
485 Internal::LayoutItem& siblingLayoutImpl = GetImplementation( siblingLayout );
486 parentLayoutImpl.Insert( siblingLayoutImpl, *this );
494 parentLayoutImpl.Add( *this );
500 RequestLayout( Dali::Toolkit::LayoutTransitionData::Type::ON_OWNER_SET );
504 void LayoutGroup::OnRegisterChildProperties( const std::string& containerType )
506 DoRegisterChildProperties( containerType );
509 void LayoutGroup::OnUnparent()
514 auto control = Toolkit::Control::DownCast( GetOwner() );
517 DevelActor::ChildAddedSignal( control ).Disconnect( mSlotDelegate, &LayoutGroup::ChildAddedToOwner );
518 DevelActor::ChildRemovedSignal( control ).Disconnect( mSlotDelegate, &LayoutGroup::ChildRemovedFromOwner );
519 DevelHandle::PropertySetSignal( control ).Disconnect( mSlotDelegate, &LayoutGroup::OnOwnerPropertySet );
523 void LayoutGroup::RemoveChild( LayoutItem& item )
525 item.SetParent( nullptr );
526 OnChildRemove( item );
529 void LayoutGroup::ChildAddedToOwner( Actor child )
531 ChildAddedToOwnerImpl( child );
532 RequestLayout( Dali::Toolkit::LayoutTransitionData::Type::ON_CHILD_ADD, child, Actor() );
535 void LayoutGroup::ChildAddedToOwnerImpl( Actor child )
537 LayoutItemPtr childLayout;
538 Toolkit::Control control = Toolkit::Control::DownCast( child );
540 #if defined(DEBUG_ENABLED)
541 auto parent = Toolkit::Control::DownCast( GetOwner() );
542 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::ChildAddedToOwner child control(%s) owner control(%s)\n",
543 control?control.GetName().c_str():"Invalid",
544 parent?parent.GetName().c_str():"Invalid" );
547 if( control ) // Can only support adding Controls, not Actors to layout
549 Internal::Control& childControlImpl = GetImplementation( control );
550 Internal::Control::Impl& childControlDataImpl = Internal::Control::Impl::Get( childControlImpl );
551 childLayout = childControlDataImpl.GetLayout();
555 // If the child doesn't already have a layout, then create a LayoutItem or LayoutGroup for it.
556 // If control behaviour flag set to Layout then set a LayoutGroup.
557 if( DevelControl::IsLayoutingRequired( control ) )
559 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::ChildAddedToOwner Creating default LayoutGroup for control:%s\n",
560 control?control.GetName().c_str():"Invalid" );
561 childLayout = LayoutGroup::New( control );
565 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::ChildAddedToOwner Creating default LayoutItem for control:%s\n",
566 control?control.GetName().c_str():"Invalid" );
567 childLayout = LayoutItem::New( control );
568 childLayout->SetAnimateLayout( IsLayoutAnimated() ); // forces animation inheritance.
571 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup::ChildAddedToOwner child control:" << control.GetName() <<
572 " desiredWidth: " << control.GetNaturalSize().width <<
573 " desiredHeight:" << control.GetNaturalSize().height );
575 childControlDataImpl.SetLayout( *childLayout.Get() );
577 Vector3 size = child.GetTargetSize();
578 // If the size of the control is set explicitly make sure that the control size
579 // stays the same after the layout except it is over written with match parent specs.
582 childLayout->SetMinimumWidth( size.x );
587 childLayout->SetMinimumHeight( size.y );
589 // Default layout data will be generated by Add().
593 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::ChildAddedToOwner child(%s) already has a Layout\n", control.GetName().c_str() );
594 LayoutGroupPtr layoutGroup( dynamic_cast< LayoutGroup* >( childLayout.Get() ) );
597 // Set only in case of leaf children
598 childLayout->SetAnimateLayout( IsLayoutAnimated() );
602 Add( *childLayout.Get() );
606 void LayoutGroup::ChildRemovedFromOwner( Actor child )
608 Toolkit::Control control = Toolkit::Control::DownCast( child );
611 Internal::Control& childControlImpl = GetImplementation( control );
612 Internal::Control::Impl& childControlDataImpl = Internal::Control::Impl::Get( childControlImpl );
613 auto childLayout = childControlDataImpl.GetLayout();
616 Remove( *childLayout.Get() );
617 RequestLayout( Dali::Toolkit::LayoutTransitionData::Type::ON_CHILD_REMOVE, child, Actor() );
622 void LayoutGroup::OnOwnerPropertySet( Handle& handle, Property::Index index, Property::Value value )
624 DALI_LOG_INFO( gLogFilter, Debug::Concise, "LayoutGroup::OnOwnerPropertySet\n");
625 auto actor = Actor::DownCast( handle );
628 index == Actor::Property::LAYOUT_DIRECTION ||
629 index == Toolkit::Control::Property::PADDING ||
630 index == Toolkit::Control::Property::MARGIN
638 void LayoutGroup::OnAnimationStateChanged( bool animateLayout )
640 // Change children's animation state
641 for( auto&& child : mImpl->mChildren )
643 LayoutGroupPtr parentGroup( dynamic_cast< LayoutGroup* >( child.child.Get() ) );
646 // Change state only in case of leaf children
647 child.child->SetAnimateLayout( animateLayout );
652 void LayoutGroup::OnMeasure( MeasureSpec widthMeasureSpec, MeasureSpec heightMeasureSpec )
654 auto childCount = GetChildCount();
656 DALI_LOG_STREAM( gLogFilter, Debug::Verbose,
657 "LayoutGroup::OnMeasure Actor Id:" << Actor::DownCast(GetOwner()).GetId() <<
658 " Owner:" << Actor::DownCast(GetOwner()).GetName() <<
659 " Child Count:" << childCount <<
660 " MeasureSpecs( width:"<<widthMeasureSpec<<", height:"<<heightMeasureSpec );
662 auto widthMode = widthMeasureSpec.GetMode();
663 auto heightMode = heightMeasureSpec.GetMode();
664 LayoutLength widthSpecSize = widthMeasureSpec.GetSize();
665 LayoutLength heightSpecSize = heightMeasureSpec.GetSize();
667 bool exactWidth ( false );
668 bool exactHeight ( false );
670 // Layouting behaviour
671 // EXACT, width and height as provided.
672 // MATCH_PARENT, width and height that of parent
673 // WRAP_CONTENT, take width of widest child and height size of longest child (within given limit)
674 // UNSPECIFIED, take width of widest child and height size of longest child.
676 LayoutLength layoutWidth( 0 );
677 LayoutLength layoutHeight( 0 );
679 // If LayoutGroup has children then measure children to get max dimensions
680 if ( childCount > 0 )
682 for( unsigned int i=0; i<childCount; ++i )
684 auto childLayout = GetChildAt( i );
687 auto childControl = Toolkit::Control::DownCast(childLayout->GetOwner());
689 // If child control has children check if a ResizePolicy is set on it. A LayoutItem could be a legacy container.
690 // A legacy container would need it's ResizePolicy to be applied as a MeasureSpec.
692 // Check below will be true for legacy containers and controls with layout required set.
693 // Other layouts will have their own OnMeasure (a checked requirement) hence not execute LayoutGroup::OnMeasure.
694 // Controls which have set layout required will not be legacy controls hence should not have a ResizePolicy set.
695 // Only need to map the resize policy the first time as the Layouting system will then set it to FIXED.
696 if( childControl.GetChildCount() > 0 && ! mImpl->mResizePolicyMapped )
698 // First pass, Static mappings that are not dependant on parent
699 SizeNegotiationMapper::SetLayoutParametersUsingResizePolicy( childControl, childLayout, Dimension::WIDTH );
700 SizeNegotiationMapper::SetLayoutParametersUsingResizePolicy( childControl, childLayout, Dimension::HEIGHT );
701 mImpl->mResizePolicyMapped = true;
704 // Second pass, if any mappings were not possible due to parent size dependancies then calculate an exact desired size for child
705 if( true == childLayout->IsResizePolicyRequired() ) // No need to test child count as this flag would only be set if control had children.
707 // Get last stored width and height specifications for the child
708 LayoutLength desiredWidth = childControl.GetProperty<float>( Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION );
709 LayoutLength desiredHeight = childControl.GetProperty<float>( Toolkit::LayoutItem::ChildProperty::HEIGHT_SPECIFICATION );
711 DALI_LOG_INFO( gLogFilter, Debug::General, "LayoutGroup::MeasureChild Initial desired size pre ResizePolicy(%f,%f)\n", desiredWidth.AsInteger(), desiredHeight.AsInteger() );
713 childLayout->SetResizePolicyRequired( false ); // clear flag incase in case of changes before next Measure
714 SizeNegotiationMapper::GetSizeofChildForParentDependentResizePolicy( childControl, widthMeasureSpec, heightMeasureSpec, desiredWidth, desiredHeight );
716 // Parent dependant ResizePolicies become exact sizes so are now set on the child before it's measured.
717 childControl.SetProperty( Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION, desiredWidth.AsInteger() );
718 childControl.SetProperty( Toolkit::LayoutItem::ChildProperty::HEIGHT_SPECIFICATION, desiredHeight.AsInteger() );
720 DALI_LOG_INFO( gLogFilter, Debug::General, " LayoutGroup::OnMeasure ResizePolicy Required resulting size(%f,%f)\n", desiredWidth.AsInteger(), desiredHeight.AsInteger() );
724 MeasureChild( childLayout, widthMeasureSpec, heightMeasureSpec );
725 LayoutLength childWidth = childLayout->GetMeasuredWidth();
726 LayoutLength childHeight = childLayout->GetMeasuredHeight();
728 Extents childMargin = childLayout->GetMargin();
729 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup::OnMeasure child " << childControl.GetName().c_str() << " width[" << childWidth << "] height[" << childHeight << "]\n" );
731 layoutWidth = std::max( layoutWidth, childWidth + childMargin.start + childMargin.end );
732 layoutHeight = std::max( layoutHeight, childHeight + childMargin.top + childMargin.bottom );
733 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup::OnMeasure calculated child width[" << layoutWidth << "] height[" << layoutHeight << "]\n" );
737 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::OnMeasure Not a layout\n" );
741 Extents padding = GetPadding();
742 layoutWidth += padding.start + padding.end;
743 layoutHeight += padding.top + padding.bottom;
747 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::OnMeasure Getting default size as a leaf\n" );
748 // LayoutGroup does not contain any children so must be a leaf
749 layoutWidth = GetDefaultSize( GetSuggestedMinimumWidth(), widthMeasureSpec );
750 layoutHeight = GetDefaultSize( GetSuggestedMinimumHeight(), heightMeasureSpec );
753 // Can't exceed specified width
754 if( widthMode == MeasureSpec::Mode::EXACTLY )
758 else if ( widthMode == MeasureSpec::Mode::AT_MOST )
760 layoutWidth = std::min( layoutWidth, widthSpecSize );
763 // Can't exceed specified height
764 if( heightMode == MeasureSpec::Mode::EXACTLY )
768 else if ( heightMode == MeasureSpec::Mode::AT_MOST )
770 layoutHeight = std::min( layoutHeight, heightSpecSize );
773 layoutWidth = std::max( layoutWidth, GetSuggestedMinimumWidth() );
774 layoutHeight = std::max( layoutHeight, GetSuggestedMinimumHeight() );
778 layoutWidth = widthSpecSize;
783 layoutHeight = heightSpecSize;
786 DALI_LOG_STREAM( gLogFilter, Debug::General, "LayoutGroup::OnMeasure Measured size(" << layoutWidth << "," << layoutHeight << ") for : " << Actor::DownCast(GetOwner()).GetName() << " \n" );
787 SetMeasuredDimensions( MeasuredSize( layoutWidth ), MeasuredSize( layoutHeight ) );
790 void LayoutGroup::OnLayout( bool changed, LayoutLength left, LayoutLength top, LayoutLength right, LayoutLength bottom )
792 auto count = GetChildCount();
794 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup OnLayout owner:" << ( ( Toolkit::Control::DownCast(GetOwner())) ? Toolkit::Control::DownCast(GetOwner()).GetName() : "invalid" ) << " childCount:" << count );
796 for( unsigned int childIndex = 0; childIndex < count; childIndex++)
798 LayoutItemPtr childLayout = GetChildAt( childIndex );
799 if( childLayout != nullptr )
802 auto childOwner = childLayout->GetOwner();
803 LayoutLength childWidth = childLayout->GetMeasuredWidth();
804 LayoutLength childHeight = childLayout->GetMeasuredHeight();
805 Extents childMargin = childLayout->GetMargin();
806 auto control = Toolkit::Control::DownCast( childOwner );
807 Extents padding = GetPadding();
809 auto childPosition = control.GetProperty< Vector3 >( Actor::Property::POSITION );
810 auto anchorPoint = control.GetProperty< Vector3 >( Actor::Property::ANCHOR_POINT );
812 DALI_LOG_STREAM( gLogFilter, Debug::General, "LayoutGroup::OnLayout child[" << control.GetName() <<
813 "] position(" << childPosition << ") child width[" << childWidth << "] height[" << childHeight << "]\n" );
815 // Margin and Padding only supported when child anchor point is TOP_LEFT.
816 int paddingAndMarginOffsetX = ( AnchorPoint::TOP_LEFT == anchorPoint ) ? ( padding.top + childMargin.top ) : 0;
817 int paddingAndMarginOffsetY = ( AnchorPoint::TOP_LEFT == anchorPoint ) ? ( padding.start + childMargin.start ) : 0;
818 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::OnLayout paddingMargin offset(%d,%d)\n", paddingAndMarginOffsetX, paddingAndMarginOffsetY );
820 LayoutLength childLeft = childPosition.x + paddingAndMarginOffsetX;
821 LayoutLength childTop = childPosition.y + paddingAndMarginOffsetY;
823 childLayout->Layout( childLeft, childTop, childLeft + childWidth, childTop + childHeight );
829 } // namespace Internal
830 } // namespace Toolkit