dali-toolkit/internal/layouting/absolute-layout-impl.cpp

   1 /*
   2  * Copyright (c) 2018 Samsung Electronics Co., Ltd.
   3  *
   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
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  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.
  15  */
  16
  17 //CLASS HEADER
  18 #include <dali-toolkit/internal/layouting/absolute-layout-impl.h>
  19
  20 //INTERNAL HEADERS
  21 #include <dali/integration-api/debug.h>
  22 #include <dali/public-api/common/extents.h>
  23 #include <dali/public-api/actors/actor.h>
  24 #include <dali-toolkit/devel-api/layouting/layout-item.h>
  25 #include <dali-toolkit/public-api/controls/control-impl.h>
  26 #include <dali-toolkit/internal/controls/control/control-data-impl.h>
  27
  28 namespace
  29 {
  30 #if defined(DEBUG_ENABLED)
  31 static Debug::Filter* gLogFilter = Debug::Filter::New( Debug::NoLogging, false, "LOG_LAYOUT" );
  32 #endif
  33 }
  34
  35 namespace Dali
  36 {
  37 namespace Toolkit
  38 {
  39 namespace Internal
  40 {
  41
  42 AbsoluteLayoutPtr AbsoluteLayout::New()
  43 {
  44   AbsoluteLayoutPtr layout( new AbsoluteLayout() );
  45   return layout;
  46 }
  47
  48 AbsoluteLayout::AbsoluteLayout()
  49 : LayoutGroup()
  50 {
  51 }
  52
  53 AbsoluteLayout::~AbsoluteLayout()
  54 {
  55 }
  56
  57 void AbsoluteLayout::OnMeasure( MeasureSpec widthMeasureSpec, MeasureSpec heightMeasureSpec )
  58 {
  59 #if defined(DEBUG_ENABLED)
  60   auto actor = Actor::DownCast(GetOwner());
  61
  62   std::ostringstream oss;
  63   oss << "AbsoluteLayout::OnMeasure  ";
  64   if( actor )
  65   {
  66     oss << "Actor Id:" << actor.GetId() << " Name:" << actor.GetName() << "  ";
  67   }
  68   oss << "widthMeasureSpec:" << widthMeasureSpec << " heightMeasureSpec:" << heightMeasureSpec << std::endl;
  69   DALI_LOG_INFO( gLogFilter, Debug::Concise, oss.str().c_str() );
  70 #endif
  71
  72   LayoutLength totalHeight( 0 );
  73   LayoutLength totalWidth( 0 );
  74
  75   struct
  76   {
  77     MeasuredSize::State widthState;
  78     MeasuredSize::State heightState;
  79   } childState = { MeasuredSize::State::MEASURED_SIZE_OK, MeasuredSize::State::MEASURED_SIZE_OK };
  80
  81   LayoutLength minPositionX( 0 );
  82   LayoutLength minPositionY( 0 );
  83   LayoutLength maxPositionX( 0 );
  84   LayoutLength maxPositionY( 0 );
  85
  86   // measure children
  87   for( unsigned int i=0; i<GetChildCount(); ++i )
  88   {
  89     auto childLayout = GetChildAt( i );
  90     if( childLayout )
  91     {
  92       auto childOwner = childLayout->GetOwner();
  93
  94       // Get size of child
  95       MeasureChild( childLayout, widthMeasureSpec, heightMeasureSpec );
  96       LayoutLength childWidth = childLayout->GetMeasuredWidth();
  97       LayoutLength childHeight = childLayout->GetMeasuredHeight();
  98
  99       // Determine the width and height needed by the children using their given position and size.
 100       // Children could overlap so find the left most and right most child.
 101       auto childPosition = childOwner.GetProperty< Vector3 >( Actor::Property::POSITION );
 102       LayoutLength childLeft = childPosition.x;
 103       LayoutLength childTop = childPosition.y;
 104
 105       minPositionX = std::min( minPositionX, childLeft );
 106       maxPositionX = std::max( maxPositionX, childLeft + childWidth );
 107       // Children could overlap so find the highest and lowest child.
 108       minPositionY = std::min( minPositionY, childTop );
 109       maxPositionY = std::max( maxPositionY, childTop + childHeight );
 110
 111       // Store current width and height needed to contain all children.
 112       totalWidth = maxPositionX - minPositionX;
 113       totalHeight = maxPositionY - minPositionY;
 114       DALI_LOG_INFO( gLogFilter, Debug::Concise, "AbsoluteLayout::OnMeasure child width(%f) height(%f) \n", totalWidth.AsDecimal(), totalHeight.AsDecimal() );
 115
 116       if( childLayout->GetMeasuredWidthAndState().GetState() == MeasuredSize::State::MEASURED_SIZE_TOO_SMALL )
 117       {
 118         childState.widthState = MeasuredSize::State::MEASURED_SIZE_TOO_SMALL;
 119       }
 120       if( childLayout->GetMeasuredHeightAndState().GetState() == MeasuredSize::State::MEASURED_SIZE_TOO_SMALL )
 121       {
 122         childState.heightState = MeasuredSize::State::MEASURED_SIZE_TOO_SMALL;
 123       }
 124     }
 125   }
 126
 127   MeasuredSize widthSizeAndState = ResolveSizeAndState( totalWidth, widthMeasureSpec, MeasuredSize::State::MEASURED_SIZE_OK);
 128   MeasuredSize heightSizeAndState = ResolveSizeAndState( totalHeight, heightMeasureSpec, MeasuredSize::State::MEASURED_SIZE_OK);
 129   totalWidth = widthSizeAndState.GetSize();
 130   totalHeight = heightSizeAndState.GetSize();
 131
 132   // Ensure layout respects it's given minimum size
 133   totalWidth = std::max( totalWidth, GetSuggestedMinimumWidth() );
 134   totalHeight = std::max( totalHeight, GetSuggestedMinimumHeight() );
 135
 136   widthSizeAndState.SetState( childState.widthState );
 137   heightSizeAndState.SetState( childState.heightState );
 138
 139   SetMeasuredDimensions( ResolveSizeAndState( totalWidth, widthMeasureSpec, childState.widthState ),
 140                          ResolveSizeAndState( totalHeight, heightMeasureSpec, childState.heightState ) );
 141
 142 }
 143
 144 void AbsoluteLayout::OnLayout( bool changed, LayoutLength left, LayoutLength top, LayoutLength right, LayoutLength bottom )
 145 {
 146   // Absolute layout positions it's children at their Actor positions.
 147   // Children could overlap or spill outside the parent, as is the nature of absolute positions.
 148   auto count = GetChildCount();
 149   DALI_LOG_INFO( gLogFilter, Debug::Concise, "AbsoluteLayout::OnLayout child count(%d)\n", count  );
 150
 151   for( unsigned int i = 0; i < count; i++)
 152   {
 153     LayoutItemPtr childLayout = GetChildAt( i );
 154     if( childLayout != nullptr )
 155     {
 156       auto childOwner = childLayout->GetOwner();
 157       LayoutLength childWidth = childLayout->GetMeasuredWidth();
 158       LayoutLength childHeight = childLayout->GetMeasuredHeight();
 159
 160       auto childPosition = childOwner.GetProperty< Vector3 >( Actor::Property::POSITION );
 161
 162       LayoutLength childTop = childPosition.y;
 163       LayoutLength childLeft = childPosition.x;
 164
 165       DALI_LOG_STREAM( gLogFilter, Debug::General,
 166                        "AbsoluteLayout::OnLayout child[" << Toolkit::Control::DownCast( childOwner ).GetName().c_str() <<
 167                        "] position(" << childPosition << ") child width[" << childWidth << "] height[" << childHeight << "]\n" );
 168
 169       childLayout->Layout( childLeft, childTop, childLeft + childWidth, childTop + childHeight );
 170     }
 171   }
 172 }
 173
 174 } // namespace Internal
 175 } // namespace Toolkit
 176 } // namespace Dali