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 void LayoutGroup::RemoveAll()
177 for( auto iter = mImpl->mChildren.begin() ; iter != mImpl->mChildren.end() ; )
179 RemoveChild( *iter->child.Get() );
180 iter = mImpl->mChildren.erase(iter);
184 unsigned int LayoutGroup::GetChildCount() const
186 return mImpl->mChildren.size();
189 LayoutItemPtr LayoutGroup::GetChildAt( unsigned int index ) const
191 DALI_ASSERT_ALWAYS( index < mImpl->mChildren.size() );
192 return mImpl->mChildren[ index ].child;
195 LayoutItemPtr LayoutGroup::GetChild( Toolkit::LayoutGroup::LayoutId childId ) const
197 for( auto&& childLayout : mImpl->mChildren )
199 if( childLayout.layoutId == childId )
201 return childLayout.child;
207 Toolkit::LayoutGroup::LayoutId LayoutGroup::GetChildId( LayoutItem& child ) const
209 for( auto&& childLayout : mImpl->mChildren )
211 if( childLayout.child.Get() == &child )
213 return childLayout.layoutId;
216 return Toolkit::LayoutGroup::UNKNOWN_ID;
219 void LayoutGroup::OnChildAdd( LayoutItem& child )
223 void LayoutGroup::OnChildRemove( LayoutItem& child )
227 void LayoutGroup::DoInitialize()
231 void LayoutGroup::DoRegisterChildProperties( const std::string& containerType )
235 void LayoutGroup::OnSetChildProperties( Handle& handle, Property::Index index, Property::Value value )
237 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup::OnSetChildProperties property(" << handle.GetPropertyName(index) << ")\n" );
239 if ( ( ( index >= CHILD_PROPERTY_REGISTRATION_START_INDEX ) &&
240 ( index <= CHILD_PROPERTY_REGISTRATION_MAX_INDEX ) )
242 ( index == Toolkit::Control::Property::MARGIN || index == Toolkit::Control::Property::PADDING ) )
244 // If any child properties are set, must perform relayout
245 for( auto&& child : mImpl->mChildren )
247 if( child.child->GetOwner() == handle )
249 child.child->RequestLayout();
256 void LayoutGroup::GenerateDefaultChildPropertyValues( Handle child )
258 child.SetProperty( Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION,
259 Toolkit::ChildLayoutData::WRAP_CONTENT );
260 child.SetProperty( Toolkit::LayoutItem::ChildProperty::HEIGHT_SPECIFICATION,
261 Toolkit::ChildLayoutData::WRAP_CONTENT );
264 void LayoutGroup::MeasureChildren( MeasureSpec widthMeasureSpec, MeasureSpec heightMeasureSpec)
266 for( auto&& child : mImpl->mChildren )
268 //if( (child.mViewFlags & Impl::VISIBILITY_MASK) != Impl::GONE ) // Use owner visibility/enabled/ready
270 MeasureChild( child.child, widthMeasureSpec, heightMeasureSpec );
275 void LayoutGroup::MeasureChild( LayoutItemPtr child,
276 MeasureSpec parentWidthMeasureSpec,
277 MeasureSpec parentHeightMeasureSpec )
279 DALI_LOG_TRACE_METHOD( gLogFilter );
281 auto childOwner = child->GetOwner();
283 auto control = Toolkit::Control::DownCast( childOwner );
285 #if defined( DEBUG_ENABLED )
288 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::MeasureChild(%s) natural size(%f, %f)\n",
289 control.GetName().c_str(), control.GetNaturalSize().width, control.GetNaturalSize().height );
294 // Get last stored width and height specifications for the child
295 auto desiredWidth = childOwner.GetProperty<int>( Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION );
296 auto desiredHeight = childOwner.GetProperty<int>( Toolkit::LayoutItem::ChildProperty::HEIGHT_SPECIFICATION );
297 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::MeasureChild desiredWidth(%d) desiredHeight(%d)\n", desiredWidth, desiredHeight );
299 auto padding = GetPadding(); // Padding of this layout's owner, not of the child being measured.
301 const MeasureSpec childWidthMeasureSpec = GetChildMeasureSpec( parentWidthMeasureSpec,
302 padding.start + padding.end,
304 const MeasureSpec childHeightMeasureSpec = GetChildMeasureSpec( parentHeightMeasureSpec,
305 padding.top + padding.bottom,
308 child->Measure( childWidthMeasureSpec, childHeightMeasureSpec );
311 void LayoutGroup::MeasureChildWithMargins( LayoutItemPtr child,
312 MeasureSpec parentWidthMeasureSpec, LayoutLength widthUsed,
313 MeasureSpec parentHeightMeasureSpec, LayoutLength heightUsed)
315 auto childOwner = child->GetOwner();
316 auto desiredWidth = childOwner.GetProperty<int>( Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION );
317 auto desiredHeight = childOwner.GetProperty<int>( Toolkit::LayoutItem::ChildProperty::HEIGHT_SPECIFICATION );
319 auto padding = GetPadding(); // Padding of this layout's owner, not of the child being measured.
321 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::MeasureChildWithMargins desiredWidth(%d)\n", desiredWidth );
323 MeasureSpec childWidthMeasureSpec = GetChildMeasureSpec( parentWidthMeasureSpec,
324 LayoutLength( padding.start + padding.end ) +
325 widthUsed, desiredWidth );
327 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::MeasureChildWithMargins desiredHeight(%d)\n", desiredHeight );
329 MeasureSpec childHeightMeasureSpec = GetChildMeasureSpec( parentHeightMeasureSpec,
330 LayoutLength( padding.top + padding.bottom )+
331 heightUsed, desiredHeight );
333 child->Measure( childWidthMeasureSpec, childHeightMeasureSpec );
337 MeasureSpec LayoutGroup::GetChildMeasureSpec(
338 MeasureSpec measureSpec,
339 LayoutLength padding,
340 LayoutLength childDimension )
342 auto specMode = measureSpec.GetMode();
343 LayoutLength specSize = measureSpec.GetSize();
345 LayoutLength size = std::max( LayoutLength(0), specSize - padding ); // reduce available size by the owners padding
347 LayoutLength resultSize = 0;
348 MeasureSpec::Mode resultMode = MeasureSpec::Mode::UNSPECIFIED;
352 // Parent has imposed an exact size on us
353 case MeasureSpec::Mode::EXACTLY:
355 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec MeasureSpec::Mode::EXACTLY\n");
356 if (childDimension == Toolkit::ChildLayoutData::MATCH_PARENT)
358 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec childDimension MATCH_PARENT\n");
360 // Child wants to be our size. So be it.
362 resultMode = MeasureSpec::Mode::EXACTLY;
364 else if (childDimension == Toolkit::ChildLayoutData::WRAP_CONTENT)
366 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec childDimension WRAP_CONTENT\n");
368 // Child wants to determine its own size. It can't be
371 resultMode = MeasureSpec::Mode::AT_MOST;
375 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec childDimension UNSPECIFIED\n");
376 resultSize = childDimension;
377 resultMode = MeasureSpec::Mode::EXACTLY;
383 // Parent has imposed a maximum size on us
384 case MeasureSpec::Mode::AT_MOST:
386 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec MeasureSpec::Mode::AT_MOST\n");
387 if (childDimension == Toolkit::ChildLayoutData::MATCH_PARENT)
389 // Child wants to be our size, but our size is not fixed.
390 // Constrain child to not be bigger than us.
392 resultMode = MeasureSpec::Mode::AT_MOST;
394 else if (childDimension == Toolkit::ChildLayoutData::WRAP_CONTENT)
396 // Child wants to determine its own size. It can't be
399 resultMode = MeasureSpec::Mode::AT_MOST;
403 // Child wants a specific size... so be it
404 resultSize = childDimension + padding;
405 resultMode = MeasureSpec::Mode::EXACTLY;
411 // Parent asked to see how big we want to be
412 case MeasureSpec::Mode::UNSPECIFIED:
414 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec MeasureSpec::Mode::UNSPECIFIED\n");
416 if (childDimension == Toolkit::ChildLayoutData::MATCH_PARENT)
418 // Child wants to be our size... find out how big it should be
419 resultSize = LayoutItem::Impl::sUseZeroUnspecifiedMeasureSpec ? LayoutLength(0) : size;
420 resultMode = MeasureSpec::Mode::UNSPECIFIED;
422 else if (childDimension == Toolkit::ChildLayoutData::WRAP_CONTENT)
424 // Child wants to determine its own size.... find out how big
426 resultSize = LayoutItem::Impl::sUseZeroUnspecifiedMeasureSpec ? LayoutLength(0) : size;
427 resultMode = MeasureSpec::Mode::UNSPECIFIED;
431 // Child wants a specific size... let him have it
432 resultSize = childDimension + padding;
433 resultMode = MeasureSpec::Mode::EXACTLY;
439 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup::GetChildMeasureSpec resultSize(" << resultSize << ")\n" );
441 //noinspection ResourceType
442 return MeasureSpec( resultSize, resultMode );
446 void LayoutGroup::OnInitialize()
448 auto control = Toolkit::Control::DownCast( GetOwner() );
452 // Take ownership of existing children
453 for( unsigned int childIndex = 0 ; childIndex < control.GetChildCount(); ++childIndex )
455 ChildAddedToOwnerImpl( control.GetChildAt( childIndex ) );
458 DevelActor::ChildAddedSignal( control ).Connect( mSlotDelegate, &LayoutGroup::ChildAddedToOwner );
459 DevelActor::ChildRemovedSignal( control ).Connect( mSlotDelegate, &LayoutGroup::ChildRemovedFromOwner );
460 DevelHandle::PropertySetSignal( control ).Connect( mSlotDelegate, &LayoutGroup::OnOwnerPropertySet );
462 if( control.GetParent() )
464 auto parent = Toolkit::Control::DownCast( control.GetParent() );
467 auto parentLayout = Toolkit::LayoutGroup::DownCast( DevelControl::GetLayout( parent ) );
470 Internal::LayoutGroup& parentLayoutImpl = GetImplementation( parentLayout );
472 unsigned int count = parent.GetChildCount();
473 unsigned int index = static_cast< unsigned int >( control.GetProperty< int >( DevelActor::Property::SIBLING_ORDER ) );
475 // Find insertion position
476 while( ++index < count )
478 auto sibling = Toolkit::Control::DownCast( parent.GetChildAt( index ) );
481 auto siblingLayout = DevelControl::GetLayout( sibling );
484 Internal::LayoutItem& siblingLayoutImpl = GetImplementation( siblingLayout );
485 parentLayoutImpl.Insert( siblingLayoutImpl, *this );
493 parentLayoutImpl.Add( *this );
499 RequestLayout( Dali::Toolkit::LayoutTransitionData::Type::ON_OWNER_SET );
503 void LayoutGroup::OnRegisterChildProperties( const std::string& containerType )
505 DoRegisterChildProperties( containerType );
508 void LayoutGroup::OnUnparent()
513 auto control = Toolkit::Control::DownCast( GetOwner() );
516 DevelActor::ChildAddedSignal( control ).Disconnect( mSlotDelegate, &LayoutGroup::ChildAddedToOwner );
517 DevelActor::ChildRemovedSignal( control ).Disconnect( mSlotDelegate, &LayoutGroup::ChildRemovedFromOwner );
518 DevelHandle::PropertySetSignal( control ).Disconnect( mSlotDelegate, &LayoutGroup::OnOwnerPropertySet );
522 void LayoutGroup::RemoveChild( LayoutItem& item )
524 item.SetParent( nullptr );
525 OnChildRemove( item );
528 void LayoutGroup::ChildAddedToOwner( Actor child )
530 ChildAddedToOwnerImpl( child );
531 RequestLayout( Dali::Toolkit::LayoutTransitionData::Type::ON_CHILD_ADD, child, Actor() );
534 void LayoutGroup::ChildAddedToOwnerImpl( Actor child )
536 LayoutItemPtr childLayout;
537 Toolkit::Control control = Toolkit::Control::DownCast( child );
539 #if defined(DEBUG_ENABLED)
540 auto parent = Toolkit::Control::DownCast( GetOwner() );
541 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::ChildAddedToOwner child control(%s) owner control(%s)\n",
542 control?control.GetName().c_str():"Invalid",
543 parent?parent.GetName().c_str():"Invalid" );
546 if( control ) // Can only support adding Controls, not Actors to layout
548 Internal::Control& childControlImpl = GetImplementation( control );
549 Internal::Control::Impl& childControlDataImpl = Internal::Control::Impl::Get( childControlImpl );
550 childLayout = childControlDataImpl.GetLayout();
554 // If the child doesn't already have a layout, then create a LayoutItem or LayoutGroup for it.
555 // If control behaviour flag set to Layout then set a LayoutGroup.
556 if( DevelControl::IsLayoutingRequired( control ) )
558 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::ChildAddedToOwner Creating default LayoutGroup for control:%s\n",
559 control?control.GetName().c_str():"Invalid" );
560 childLayout = LayoutGroup::New( control );
564 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::ChildAddedToOwner Creating default LayoutItem for control:%s\n",
565 control?control.GetName().c_str():"Invalid" );
566 childLayout = LayoutItem::New( control );
567 childLayout->SetAnimateLayout( IsLayoutAnimated() ); // forces animation inheritance.
570 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup::ChildAddedToOwner child control:" << control.GetName() <<
571 " desiredWidth: " << control.GetNaturalSize().width <<
572 " desiredHeight:" << control.GetNaturalSize().height );
574 childControlDataImpl.SetLayout( *childLayout.Get() );
576 Vector3 size = child.GetTargetSize();
577 // If the size of the control is set explicitly make sure that the control size
578 // stays the same after the layout except it is over written with match parent specs.
581 childLayout->SetMinimumWidth( size.x );
586 childLayout->SetMinimumHeight( size.y );
588 // Default layout data will be generated by Add().
592 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::ChildAddedToOwner child(%s) already has a Layout\n", control.GetName().c_str() );
593 LayoutGroupPtr layoutGroup( dynamic_cast< LayoutGroup* >( childLayout.Get() ) );
596 // Set only in case of leaf children
597 childLayout->SetAnimateLayout( IsLayoutAnimated() );
601 Add( *childLayout.Get() );
605 void LayoutGroup::ChildRemovedFromOwner( Actor child )
607 Toolkit::Control control = Toolkit::Control::DownCast( child );
610 Internal::Control& childControlImpl = GetImplementation( control );
611 Internal::Control::Impl& childControlDataImpl = Internal::Control::Impl::Get( childControlImpl );
612 auto childLayout = childControlDataImpl.GetLayout();
615 Remove( *childLayout.Get() );
616 RequestLayout( Dali::Toolkit::LayoutTransitionData::Type::ON_CHILD_REMOVE, child, Actor() );
621 void LayoutGroup::OnOwnerPropertySet( Handle& handle, Property::Index index, Property::Value value )
623 DALI_LOG_INFO( gLogFilter, Debug::Concise, "LayoutGroup::OnOwnerPropertySet\n");
624 auto actor = Actor::DownCast( handle );
627 index == Actor::Property::LAYOUT_DIRECTION ||
628 index == Toolkit::Control::Property::PADDING ||
629 index == Toolkit::Control::Property::MARGIN
637 void LayoutGroup::OnAnimationStateChanged( bool animateLayout )
639 // Change children's animation state
640 for( auto&& child : mImpl->mChildren )
642 LayoutGroupPtr parentGroup( dynamic_cast< LayoutGroup* >( child.child.Get() ) );
645 // Change state only in case of leaf children
646 child.child->SetAnimateLayout( animateLayout );
651 void LayoutGroup::OnMeasure( MeasureSpec widthMeasureSpec, MeasureSpec heightMeasureSpec )
653 auto childCount = GetChildCount();
655 DALI_LOG_STREAM( gLogFilter, Debug::Verbose,
656 "LayoutGroup::OnMeasure Actor Id:" << Actor::DownCast(GetOwner()).GetId() <<
657 " Owner:" << Actor::DownCast(GetOwner()).GetName() <<
658 " Child Count:" << childCount <<
659 " MeasureSpecs( width:"<<widthMeasureSpec<<", height:"<<heightMeasureSpec );
661 auto widthMode = widthMeasureSpec.GetMode();
662 auto heightMode = heightMeasureSpec.GetMode();
663 LayoutLength widthSpecSize = widthMeasureSpec.GetSize();
664 LayoutLength heightSpecSize = heightMeasureSpec.GetSize();
666 bool exactWidth ( false );
667 bool exactHeight ( false );
669 // Layouting behaviour
670 // EXACT, width and height as provided.
671 // MATCH_PARENT, width and height that of parent
672 // WRAP_CONTENT, take width of widest child and height size of longest child (within given limit)
673 // UNSPECIFIED, take width of widest child and height size of longest child.
675 LayoutLength layoutWidth( 0 );
676 LayoutLength layoutHeight( 0 );
678 // If LayoutGroup has children then measure children to get max dimensions
679 if ( childCount > 0 )
681 for( unsigned int i=0; i<childCount; ++i )
683 auto childLayout = GetChildAt( i );
686 auto childControl = Toolkit::Control::DownCast(childLayout->GetOwner());
688 // If child control has children check if a ResizePolicy is set on it. A LayoutItem could be a legacy container.
689 // A legacy container would need it's ResizePolicy to be applied as a MeasureSpec.
691 // Check below will be true for legacy containers and controls with layout required set.
692 // Other layouts will have their own OnMeasure (a checked requirement) hence not execute LayoutGroup::OnMeasure.
693 // Controls which have set layout required will not be legacy controls hence should not have a ResizePolicy set.
694 // Only need to map the resize policy the first time as the Layouting system will then set it to FIXED.
695 if( childControl.GetChildCount() > 0 && ! mImpl->mResizePolicyMapped )
697 // First pass, Static mappings that are not dependant on parent
698 SizeNegotiationMapper::SetLayoutParametersUsingResizePolicy( childControl, childLayout, Dimension::WIDTH );
699 SizeNegotiationMapper::SetLayoutParametersUsingResizePolicy( childControl, childLayout, Dimension::HEIGHT );
700 mImpl->mResizePolicyMapped = true;
703 // Second pass, if any mappings were not possible due to parent size dependancies then calculate an exact desired size for child
704 if( true == childLayout->IsResizePolicyRequired() ) // No need to test child count as this flag would only be set if control had children.
706 // Get last stored width and height specifications for the child
707 LayoutLength desiredWidth = childControl.GetProperty<float>( Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION );
708 LayoutLength desiredHeight = childControl.GetProperty<float>( Toolkit::LayoutItem::ChildProperty::HEIGHT_SPECIFICATION );
710 DALI_LOG_INFO( gLogFilter, Debug::General, "LayoutGroup::MeasureChild Initial desired size pre ResizePolicy(%f,%f)\n", desiredWidth.AsInteger(), desiredHeight.AsInteger() );
712 childLayout->SetResizePolicyRequired( false ); // clear flag incase in case of changes before next Measure
713 SizeNegotiationMapper::GetSizeofChildForParentDependentResizePolicy( childControl, widthMeasureSpec, heightMeasureSpec, desiredWidth, desiredHeight );
715 // Parent dependant ResizePolicies become exact sizes so are now set on the child before it's measured.
716 childControl.SetProperty( Toolkit::LayoutItem::ChildProperty::WIDTH_SPECIFICATION, desiredWidth.AsInteger() );
717 childControl.SetProperty( Toolkit::LayoutItem::ChildProperty::HEIGHT_SPECIFICATION, desiredHeight.AsInteger() );
719 DALI_LOG_INFO( gLogFilter, Debug::General, " LayoutGroup::OnMeasure ResizePolicy Required resulting size(%f,%f)\n", desiredWidth.AsInteger(), desiredHeight.AsInteger() );
723 MeasureChild( childLayout, widthMeasureSpec, heightMeasureSpec );
724 LayoutLength childWidth = childLayout->GetMeasuredWidth();
725 LayoutLength childHeight = childLayout->GetMeasuredHeight();
727 Extents childMargin = childLayout->GetMargin();
728 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup::OnMeasure child " << childControl.GetName().c_str() << " width[" << childWidth << "] height[" << childHeight << "]\n" );
730 layoutWidth = std::max( layoutWidth, childWidth + childMargin.start + childMargin.end );
731 layoutHeight = std::max( layoutHeight, childHeight + childMargin.top + childMargin.bottom );
732 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup::OnMeasure calculated child width[" << layoutWidth << "] height[" << layoutHeight << "]\n" );
736 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::OnMeasure Not a layout\n" );
740 Extents padding = GetPadding();
741 layoutWidth += padding.start + padding.end;
742 layoutHeight += padding.top + padding.bottom;
746 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::OnMeasure Getting default size as a leaf\n" );
747 // LayoutGroup does not contain any children so must be a leaf
748 layoutWidth = GetDefaultSize( GetSuggestedMinimumWidth(), widthMeasureSpec );
749 layoutHeight = GetDefaultSize( GetSuggestedMinimumHeight(), heightMeasureSpec );
752 // Can't exceed specified width
753 if( widthMode == MeasureSpec::Mode::EXACTLY )
757 else if ( widthMode == MeasureSpec::Mode::AT_MOST )
759 layoutWidth = std::min( layoutWidth, widthSpecSize );
762 // Can't exceed specified height
763 if( heightMode == MeasureSpec::Mode::EXACTLY )
767 else if ( heightMode == MeasureSpec::Mode::AT_MOST )
769 layoutHeight = std::min( layoutHeight, heightSpecSize );
772 layoutWidth = std::max( layoutWidth, GetSuggestedMinimumWidth() );
773 layoutHeight = std::max( layoutHeight, GetSuggestedMinimumHeight() );
777 layoutWidth = widthSpecSize;
782 layoutHeight = heightSpecSize;
785 DALI_LOG_STREAM( gLogFilter, Debug::General, "LayoutGroup::OnMeasure Measured size(" << layoutWidth << "," << layoutHeight << ") for : " << Actor::DownCast(GetOwner()).GetName() << " \n" );
786 SetMeasuredDimensions( MeasuredSize( layoutWidth ), MeasuredSize( layoutHeight ) );
789 void LayoutGroup::OnLayout( bool changed, LayoutLength left, LayoutLength top, LayoutLength right, LayoutLength bottom )
791 auto count = GetChildCount();
793 DALI_LOG_STREAM( gLogFilter, Debug::Verbose, "LayoutGroup OnLayout owner:" << ( ( Toolkit::Control::DownCast(GetOwner())) ? Toolkit::Control::DownCast(GetOwner()).GetName() : "invalid" ) << " childCount:" << count );
795 for( unsigned int childIndex = 0; childIndex < count; childIndex++)
797 LayoutItemPtr childLayout = GetChildAt( childIndex );
798 if( childLayout != nullptr )
801 auto childOwner = childLayout->GetOwner();
802 LayoutLength childWidth = childLayout->GetMeasuredWidth();
803 LayoutLength childHeight = childLayout->GetMeasuredHeight();
804 Extents childMargin = childLayout->GetMargin();
805 auto control = Toolkit::Control::DownCast( childOwner );
806 Extents padding = GetPadding();
808 auto childPosition = control.GetProperty< Vector3 >( Actor::Property::POSITION );
809 auto anchorPoint = control.GetProperty< Vector3 >( Actor::Property::ANCHOR_POINT );
811 DALI_LOG_STREAM( gLogFilter, Debug::General, "LayoutGroup::OnLayout child[" << control.GetName() <<
812 "] position(" << childPosition << ") child width[" << childWidth << "] height[" << childHeight << "]\n" );
814 // Margin and Padding only supported when child anchor point is TOP_LEFT.
815 int paddingAndMarginOffsetX = ( AnchorPoint::TOP_LEFT == anchorPoint ) ? ( padding.top + childMargin.top ) : 0;
816 int paddingAndMarginOffsetY = ( AnchorPoint::TOP_LEFT == anchorPoint ) ? ( padding.start + childMargin.start ) : 0;
817 DALI_LOG_INFO( gLogFilter, Debug::Verbose, "LayoutGroup::OnLayout paddingMargin offset(%d,%d)\n", paddingAndMarginOffsetX, paddingAndMarginOffsetY );
819 LayoutLength childLeft = childPosition.x + paddingAndMarginOffsetX;
820 LayoutLength childTop = childPosition.y + paddingAndMarginOffsetY;
822 childLayout->Layout( childLeft, childTop, childLeft + childWidth, childTop + childHeight );
828 } // namespace Internal
829 } // namespace Toolkit