examples/layouting/absolute-example.cpp

   1 /*
   2  * Copyright (c) 2017 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
  18 #include <string>
  19 #include "absolute-example.h"
  20 #include "layout-utilities.h"
  21 #include <dali-toolkit/devel-api/visuals/image-visual-properties-devel.h>
  22 #include <dali-toolkit/devel-api/visual-factory/visual-factory.h>
  23 #include <dali-toolkit/devel-api/controls/control-devel.h>
  24 #include <dali-toolkit/devel-api/layouting/absolute-layout.h>
  25
  26 using namespace Dali;
  27 using namespace Dali::Toolkit;
  28
  29
  30 namespace
  31 {
  32 const char* const TITLE = "Absolute Example";
  33
  34 struct ImageDetails
  35 {
  36   const char * name;
  37   Vector2 position;
  38   Size size;
  39 };
  40
  41 ImageDetails IMAGES[] =
  42 {
  43   { DEMO_IMAGE_DIR "gallery-small-23.jpg", Vector2( 0.0f,   0.0f ), Size( 100.0f, 100.0f ) },
  44   { DEMO_IMAGE_DIR "gallery-small-23.jpg", Vector2( 100.0f,   0.0f ), Size( 100.0f, 100.0f ) },
  45   { DEMO_IMAGE_DIR "gallery-small-23.jpg", Vector2( 0.0f, 100.0f ), Size( 100.0f, 100.0f ) },
  46   { DEMO_IMAGE_DIR "gallery-small-23.jpg", Vector2( 200.0f, 200.0f ), Size( 100.0f, 100.0f ) },
  47 };
  48 unsigned int IMAGE_COUNT=sizeof(IMAGES)/sizeof(IMAGES[0]);
  49
  50 // Helper function to create ImageViews with given filename and size.
  51 void CreateChildImageView( ImageView& imageView, unsigned imageIndex )
  52 {
  53   imageView = ImageView::New();
  54   Property::Map imagePropertyMap;
  55   imagePropertyMap[ Visual::Property::TYPE ] = Toolkit::Visual::IMAGE;
  56   imagePropertyMap[ ImageVisual::Property::URL ] = IMAGES[imageIndex].name;
  57   imagePropertyMap[ ImageVisual::Property::DESIRED_WIDTH ] = IMAGES[imageIndex].size.width ;
  58   imagePropertyMap[ ImageVisual::Property::DESIRED_HEIGHT ] = IMAGES[imageIndex].size.height;
  59   imageView.SetProperty( ImageView::Property::IMAGE , imagePropertyMap );
  60   imageView.SetName("ImageView");
  61   imageView.SetAnchorPoint( AnchorPoint::TOP_LEFT );
  62   imageView.SetResizePolicy( ResizePolicy::FIXED, Dimension::ALL_DIMENSIONS );
  63   imageView.SetProperty( Dali::Actor::Property::POSITION, Vector3( IMAGES[imageIndex].position ) );
  64 }
  65
  66 } // namespace
  67
  68 namespace Demo
  69 {
  70
  71 AbsoluteExample::AbsoluteExample()
  72 : Example( TITLE ),
  73   mRootLayoutControl(),
  74   mAbsoluteLayoutContainer(),
  75   mLayoutSizeToggleStatus( true ),
  76   mToggleButton()
  77 {
  78
  79 }
  80
  81 void AbsoluteExample::Create()
  82 {
  83   auto stage = Stage::GetCurrent();
  84   // This layout will be the size of the stage but allows subsequent layouts to be any size.
  85   mRootLayoutControl = LayoutUtilities::CreateRootContainer();
  86   stage.Add( mRootLayoutControl );
  87
  88   // Create an Absolute Layout to show ImageViews at explictly provided positions.
  89   mAbsoluteLayoutContainer = Control::New();
  90   mAbsoluteLayoutContainer.SetBackgroundColor( Color::WHITE );
  91   auto absoluteLayout = AbsoluteLayout::New();
  92   DevelControl::SetLayout( mAbsoluteLayoutContainer, absoluteLayout );
  93   mAbsoluteLayoutContainer.SetName("AbsoluteLayout");
  94
  95   mAbsoluteLayoutContainer.SetAnchorPoint( AnchorPoint::CENTER );
  96   mAbsoluteLayoutContainer.SetParentOrigin( ParentOrigin::CENTER );
  97
  98   // Initially absolute layout to use these specifications, toggle button will alter them.
  99   mAbsoluteLayoutContainer.SetProperty( LayoutItem::ChildProperty::WIDTH_SPECIFICATION, ChildLayoutData::WRAP_CONTENT );
 100   mAbsoluteLayoutContainer.SetProperty( LayoutItem::ChildProperty::HEIGHT_SPECIFICATION,  ChildLayoutData::WRAP_CONTENT );
 101
 102   mRootLayoutControl.Add( mAbsoluteLayoutContainer );
 103
 104   for( unsigned int x = 0; x < NUMBER_OF_IMAGE_VIEWS; x++ )
 105   {
 106     CreateChildImageView( mImageViews[x], x%IMAGE_COUNT );
 107     mAbsoluteLayoutContainer.Add( mImageViews[x] );
 108   }
 109
 110   // Button toggles the size of the layout
 111   mToggleButton = PushButton::New();
 112   mToggleButton.SetProperty( Toolkit::Button::Property::LABEL, "Change layout size" );
 113   mToggleButton.SetParentOrigin( ParentOrigin::BOTTOM_CENTER );
 114   mToggleButton.SetAnchorPoint( AnchorPoint::BOTTOM_CENTER );
 115   mToggleButton.ClickedSignal().Connect( this, &Demo::AbsoluteExample::ChangeSizeClicked );
 116   mToggleButton.SetResizePolicy( ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH );
 117   mToggleButton.SetResizePolicy( ResizePolicy::USE_NATURAL_SIZE, Dimension::HEIGHT );
 118
 119   stage.Add( mToggleButton );
 120
 121 }
 122
 123 void AbsoluteExample::Remove()
 124 {
 125   UnparentAndReset( mAbsoluteLayoutContainer );
 126   UnparentAndReset( mToggleButton );
 127   UnparentAndReset( mRootLayoutControl );
 128 }
 129
 130 bool AbsoluteExample::ChangeSizeClicked( Toolkit::Button button )
 131 {
 132   if ( true == mLayoutSizeToggleStatus )
 133   {
 134     mAbsoluteLayoutContainer.SetProperty( LayoutItem::ChildProperty::WIDTH_SPECIFICATION, 480 );
 135     mAbsoluteLayoutContainer.SetProperty( LayoutItem::ChildProperty::HEIGHT_SPECIFICATION,  700 );
 136     mLayoutSizeToggleStatus = false;
 137   }
 138   else
 139   {
 140     mAbsoluteLayoutContainer.SetProperty( LayoutItem::ChildProperty::WIDTH_SPECIFICATION, ChildLayoutData::WRAP_CONTENT );
 141     mAbsoluteLayoutContainer.SetProperty( LayoutItem::ChildProperty::HEIGHT_SPECIFICATION,  ChildLayoutData::WRAP_CONTENT );
 142     mLayoutSizeToggleStatus = true;
 143   }
 144
 145   return true;
 146 }
 147
 148 } // namespace Demo