clipping-draw-order.cpp
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/*
* Copyright (c) 2020 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <dali-toolkit/dali-toolkit.h>
#include <dali-toolkit/devel-api/controls/table-view/table-view.h>
using namespace Dali;
using namespace Dali::Toolkit;
const char* images[] = {
DEMO_IMAGE_DIR "gallery-small-1.jpg",
DEMO_IMAGE_DIR "gallery-small-2.jpg",
DEMO_IMAGE_DIR "gallery-small-3.jpg",
DEMO_IMAGE_DIR "gallery-small-4.jpg",
DEMO_IMAGE_DIR "gallery-small-5.jpg"
};
// This verification example confirms drawing order is the same, with or without clipping enabled.
class ClippingDrawOrderVerification : public ConnectionTracker
{
public:
ClippingDrawOrderVerification( Application& application )
: mApplication( application )
{
// Connect to the Application's Init signal.
mApplication.InitSignal().Connect( this, &ClippingDrawOrderVerification::Create );
}
~ClippingDrawOrderVerification()
{
// Nothing to do here.
}
// The Init signal is received once (only) during the Application lifetime.
void Create( Application& application )
{
// Get a handle to the window
Window window = application.GetWindow();
window.SetBackgroundColor( Color::WHITE );
// Connect to the window's key signal to allow Back and Escape to exit.
window.KeyEventSignal().Connect( this, &ClippingDrawOrderVerification::OnKeyEvent );
// Create the title label.
TextLabel title = TextLabel::New( "Clipping draw order verification" );
title.SetProperty( TextLabel::Property::HORIZONTAL_ALIGNMENT, "CENTER" );
title.SetProperty( TextLabel::Property::VERTICAL_ALIGNMENT, "CENTER" );
title.SetProperty( Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER );
title.SetProperty( Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER );
// Create the description label.
TextLabel description = TextLabel::New( "The bottom tree should have the same draw order as the top tree.\nThey should look identical except \"C\" is clipped on the bottom tree." );
description.SetProperty( TextLabel::Property::HORIZONTAL_ALIGNMENT, "CENTER" );
description.SetProperty( TextLabel::Property::MULTI_LINE, true );
description.SetProperty( Actor::Property::ANCHOR_POINT, AnchorPoint::BOTTOM_CENTER );
description.SetProperty( Actor::Property::PARENT_ORIGIN, Vector3( 0.5f, 1.0f, 0.5f ) );
window.Add( description );
/*
* Create a 4-row TableView.
* It will be segmented as follows:
*
* +---------------+
* | Title |
* +---------------+
* | Tree |
* | Without |
* | Clipping |
* +---------------+
* | Tree |
* | With |
* | Clipping |
* +---------------+
* | Explanation |
* +---------------+
*/
TableView view = TableView::New( 4, 1 );
view.SetProperty( Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER );
view.SetProperty( Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER );
view.SetResizePolicy( ResizePolicy::FILL_TO_PARENT, Dimension::ALL_DIMENSIONS );
view.SetCellAlignment( Toolkit::TableView::CellPosition( 0, 0 ), HorizontalAlignment::CENTER, VerticalAlignment::CENTER );
view.SetCellAlignment( Toolkit::TableView::CellPosition( 1, 0 ), HorizontalAlignment::CENTER, VerticalAlignment::CENTER );
view.SetCellAlignment( Toolkit::TableView::CellPosition( 2, 0 ), HorizontalAlignment::CENTER, VerticalAlignment::CENTER );
view.SetCellAlignment( Toolkit::TableView::CellPosition( 3, 0 ), HorizontalAlignment::CENTER, VerticalAlignment::CENTER );
view.SetCellPadding( Vector2( 14.0f, 7.0f ) );
view.SetRelativeWidth( 0u, 1.0f );
view.SetFitHeight( 0u );
view.SetRelativeHeight( 1u, 0.5f );
view.SetRelativeHeight( 2u, 0.5f );
view.SetFitHeight( 3u );
// Add the title and description to the TableView.
view.AddChild( title, TableView::CellPosition( 0u, 0u ) );
view.AddChild( description, TableView::CellPosition( 3u, 0u ) );
/*
For each of the 2 tree views, we create a small tree of actors as follows:
( Note: Clipping is only enabled for B on the bottom tree ).
A
/ \
Clipping enabled -> B D
| |
C E
The correct draw order is "ABCDE" (the same as if clipping was not enabled).
*/
const float treeYStart = 0.12f;
const float depthGap = 0.35f;
for( int tree = 0; tree < 2; ++tree )
{
Control container = Control::New();
container.SetProperty( Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_CENTER );
container.SetProperty( Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_CENTER );
container.SetResizePolicy( ResizePolicy::FILL_TO_PARENT, Dimension::ALL_DIMENSIONS );
Vector4 backgroundColor = tree == 0 ? Vector4( 0.77f, 1.0f, 0.77f, 1.0f ) : Vector4( 0.8f, 0.8f, 1.0f, 1.0f );
container.SetProperty( Control::Property::BACKGROUND, backgroundColor );
ImageView image[5];
// Loop for each of the 5 images & labels.
for( int i = 0; i < 5; ++i )
{
std::stringstream labelStream;
labelStream << static_cast<char>( static_cast<char>( i ) + 'A' );
TextLabel textLabel = TextLabel::New( labelStream.str() );
textLabel.SetProperty( Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_CENTER );
image[i] = ImageView::New( images[i] );
image[i].SetProperty( Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_CENTER );
// Calculate the relative positioning for the images and labels.
float depth = static_cast<float>( i == 0 ? 0 : ( ( i - 1 ) % 2 ) + 1 );
if( i == 0 )
{
image[i].SetProperty( Actor::Property::PARENT_ORIGIN, Vector3( 0.5f, treeYStart, 0.5f ) );
textLabel.SetProperty( Actor::Property::PARENT_ORIGIN, Vector3( 1.0f, 0.05f * depth, 0.5f ) );
}
else
{
float b = i > 2 ? 1.0f : -1.0f;
image[i].SetProperty( Actor::Property::PARENT_ORIGIN, Vector3( 0.5f + ( 0.2f * b ), depthGap, 0.5f ) );
textLabel.SetProperty( Actor::Property::PARENT_ORIGIN, Vector3( 0.98f + 0.215f * b + ( 0.04f * b * depth ), treeYStart + 0.02f + ( 0.16f * depth ), 0.5f ) );
}
container.Add( textLabel );
}
// Create the title label.
std::string treeText = tree == 0 ? "Without Clipping" : "With Clipping";
TextLabel treeLabel = TextLabel::New( treeText );
treeLabel.SetProperty( TextLabel::Property::HORIZONTAL_ALIGNMENT, "CENTER" );
treeLabel.SetProperty( TextLabel::Property::VERTICAL_ALIGNMENT, "BOTTOM" );
treeLabel.SetProperty( Actor::Property::ANCHOR_POINT, AnchorPoint::BOTTOM_CENTER );
treeLabel.SetProperty( Actor::Property::PARENT_ORIGIN, ParentOrigin::BOTTOM_CENTER );
container.Add( treeLabel );
// Enable clipping for the 2nd tree.
if( tree == 1 )
{
image[1].SetProperty( Actor::Property::CLIPPING_MODE, ClippingMode::CLIP_CHILDREN );
}
// Build the tree structure.
container.Add( image[0] );
image[0].Add( image[1] );
image[1].Add( image[2] );
image[0].Add( image[3] );
image[3].Add( image[4] );
// Add the finished tree to the TableView.
view.AddChild( container, TableView::CellPosition( 1u + tree, 0u ) );
}
// Add the finished TableView to the window.
window.Add( view );
// Respond to a click anywhere on the window
window.GetRootLayer().TouchSignal().Connect( this, &ClippingDrawOrderVerification::OnTouch );
}
bool OnTouch( Actor actor, const TouchEvent& touch )
{
// Quit the application.
mApplication.Quit();
return true;
}
/**
* @brief Called when any key event is received
*
* Will use this to quit the application if Back or the Escape key is received
* @param[in] event The key event information
*/
void OnKeyEvent( const KeyEvent& event )
{
if( event.GetState() == KeyEvent::Down )
{
if( IsKey( event, DALI_KEY_ESCAPE) || IsKey( event, DALI_KEY_BACK ) )
{
mApplication.Quit();
}
}
}
private:
Application& mApplication;
};
int DALI_EXPORT_API main( int argc, char **argv )
{
Application application = Application::New( &argc, &argv );
ClippingDrawOrderVerification verification( application );
application.MainLoop();
return 0;
}