Peter M. Groen / dali-demo

/*
 * Copyright (c) 2016 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.
 *
 */

/**
 * @file text-label-example.cpp
 * @brief Basic usage of TextLabel control
 */

// EXTERNAL INCLUDES
#include <dali/devel-api/object/handle-devel.h>
#include <dali-toolkit/dali-toolkit.h>
#include <iostream>

// INTERNAL INCLUDES
#include "shared/multi-language-strings.h"
#include "shared/view.h"

using namespace Dali;
using namespace Dali::Toolkit;
using namespace MultiLanguageStrings;

namespace
{
const char* const BACKGROUND_IMAGE = DEMO_IMAGE_DIR "grab-handle.png";

const unsigned int KEY_ZERO = 10;
const unsigned int KEY_ONE = 11;
const unsigned int KEY_F = 41;
const unsigned int KEY_H = 43;
const unsigned int KEY_V = 55;
const unsigned int KEY_M = 58;
const unsigned int KEY_L = 46;
const unsigned int KEY_S = 39;
const unsigned int KEY_PLUS = 21;
const unsigned int KEY_MINUS = 20;

const char* H_ALIGNMENT_STRING_TABLE[] =
{
  "BEGIN",
  "CENTER",
  "END"
};

const unsigned int H_ALIGNMENT_STRING_COUNT = sizeof( H_ALIGNMENT_STRING_TABLE ) / sizeof( H_ALIGNMENT_STRING_TABLE[0u] );

const char* V_ALIGNMENT_STRING_TABLE[] =
{
  "TOP",
  "CENTER",
  "BOTTOM"
};

const unsigned int V_ALIGNMENT_STRING_COUNT = sizeof( V_ALIGNMENT_STRING_TABLE ) / sizeof( V_ALIGNMENT_STRING_TABLE[0u] );

int ConvertToEven(int value)
{
  return (value % 2 == 0) ? value : (value + 1);
}

struct HSVColorConstraint
{
  HSVColorConstraint(float hue, float saturation, float value)
  : hue(hue),
    saturation(saturation),
    value(value)
  {
  }

  void operator()(Vector3& current, const PropertyInputContainer& inputs )
  {
    current = hsv2rgb(Vector3(inputs[0]->GetFloat(), saturation, value));
  }

  Vector3 hsv2rgb(Vector3 colorHSV)
  {
    float r=colorHSV.z*(1+colorHSV.y*(cos(colorHSV.x)-1));
    float g=colorHSV.z*(1+colorHSV.y*(cos(colorHSV.x-2.09439)-1));
    float b=colorHSV.z*(1+colorHSV.y*(cos(colorHSV.x+2.09439)-1));
    return Vector3(r, g, b);
  }
  float hue;
  float saturation;
  float value;
};

} // anonymous namespace

/**
 * @brief The main class of the demo.
 */
class TextLabelExample : public ConnectionTracker
{
public:

  TextLabelExample( Application& application )
  : mApplication( application ),
    mLabel(),
    mContainer(),
    mGrabCorner(),
    mPanGestureDetector(),
    mLayoutSize(),
    mLanguageId( 0u ),
    mAlignment( 0u ),
    mHueAngleIndex( Property::INVALID_INDEX ),
    mOverrideMixColorIndex( Property::INVALID_INDEX )
  {
    // Connect to the Application's Init signal
    mApplication.InitSignal().Connect( this, &TextLabelExample::Create );
  }

  ~TextLabelExample()
  {
    // Nothing to do here.
  }

  /**
   * One-time setup in response to Application InitSignal.
   */
  void Create( Application& application )
  {
    Stage stage = Stage::GetCurrent();

    stage.KeyEventSignal().Connect(this, &TextLabelExample::OnKeyEvent);
    Vector2 stageSize = stage.GetSize();

    mContainer = Control::New();
    mContainer.SetName( "Container" );
    mContainer.SetParentOrigin( ParentOrigin::CENTER );
    mLayoutSize = Vector2(stageSize.width*0.6f, stageSize.width*0.6f);
    mContainer.SetSize( mLayoutSize );
    mContainer.SetDrawMode( DrawMode::OVERLAY_2D );
    stage.Add( mContainer );

    // Resize the center layout when the corner is grabbed
    mGrabCorner = ImageView::New( BACKGROUND_IMAGE );
    mGrabCorner.SetName( "GrabCorner" );
    mGrabCorner.SetAnchorPoint( AnchorPoint::TOP_CENTER );
    mGrabCorner.SetParentOrigin( ParentOrigin::BOTTOM_RIGHT );
    mGrabCorner.SetResizePolicy( ResizePolicy::USE_NATURAL_SIZE, Dimension::ALL_DIMENSIONS );
    mContainer.Add( mGrabCorner );

    mPanGestureDetector = PanGestureDetector::New();
    mPanGestureDetector.Attach( mGrabCorner );
    mPanGestureDetector.DetectedSignal().Connect( this, &TextLabelExample::OnPan );

    mLabel = TextLabel::New( "A Quick Brown Fox Jumps Over The Lazy Dog" );
    mLabel.SetName( "TextLabel" );
    mLabel.SetAnchorPoint( AnchorPoint::TOP_LEFT );
    mLabel.SetResizePolicy( ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH );
    mLabel.SetResizePolicy( ResizePolicy::FILL_TO_PARENT, Dimension::HEIGHT );
    mLabel.SetProperty( TextLabel::Property::MULTI_LINE, true );
    mLabel.SetProperty( TextLabel::Property::TEXT_COLOR, Color::BLUE );
    mLabel.SetProperty( TextLabel::Property::SHADOW_OFFSET, Vector2( 1.0f, 1.0f ) );
    mLabel.SetProperty( TextLabel::Property::SHADOW_COLOR, Color::BLACK );
    mLabel.SetBackgroundColor( Color::WHITE );
    mContainer.Add( mLabel );

    mHueAngleIndex = mLabel.RegisterProperty( "hue", 0.0f );
    Renderer bgRenderer = mLabel.GetRendererAt(0);
    mOverrideMixColorIndex = DevelHandle::GetPropertyIndex( bgRenderer, ColorVisual::Property::MIX_COLOR );

    Constraint constraint = Constraint::New<Vector3>( bgRenderer, mOverrideMixColorIndex, HSVColorConstraint(0.0f, 0.5f, 0.8f));
    constraint.AddSource( Source( mLabel, mHueAngleIndex ) );
    constraint.SetRemoveAction( Constraint::Discard );
    constraint.Apply();

    Animation anim = Animation::New(50.0f);
    anim.AnimateTo(Property(mLabel, mHueAngleIndex), 6.28318f);
    anim.SetLooping(true);
    anim.Play();

    Property::Value labelText = mLabel.GetProperty( TextLabel::Property::TEXT );
    std::cout << "Displaying text: \"" << labelText.Get< std::string >() << "\"" << std::endl;
  }

  // Resize the text-label with pan gesture
  void OnPan( Actor actor, const PanGesture& gesture )
  {
    // Reset mLayoutSize when the pan starts
    if( gesture.state == Gesture::Started )
    {
      if( mLayoutSize.x < 2.0f )
      {
        mLayoutSize.x = 2.0f;
      }

      if( mLayoutSize.y < 2.0f )
      {
        mLayoutSize.y = 2.0f;
      }
    }

    mLayoutSize.x += gesture.displacement.x * 2.0f;
    mLayoutSize.y += gesture.displacement.y * 2.0f;

    if( mLayoutSize.x >= 2.0f ||
        mLayoutSize.y >= 2.0f )
    {
      // Avoid pixel mis-alignment issue
      Vector2 clampedSize = Vector2( std::max( ConvertToEven( static_cast<int>( mLayoutSize.x )), 2 ),
                                     std::max( ConvertToEven( static_cast<int>( mLayoutSize.y )), 2 ) );

      mContainer.SetSize( clampedSize );
    }
  }

  /**
   * Main key event handler
   */
  void OnKeyEvent(const KeyEvent& event)
  {
    if(event.state == KeyEvent::Down)
    {
      if( IsKey( event, DALI_KEY_ESCAPE) || IsKey( event, DALI_KEY_BACK ) )
      {
        mApplication.Quit();
      }
      else if( event.IsCtrlModifier() )
      {
        switch( event.keyCode )
        {
          // Select rendering back-end
          case KEY_ZERO: // fall through
          case KEY_ONE:
          {
            mLabel.SetProperty( TextLabel::Property::RENDERING_BACKEND, event.keyCode - 10 );
            break;
          }
          case KEY_F: // Fill vertically
          {
            if( ResizePolicy::DIMENSION_DEPENDENCY == mLabel.GetResizePolicy(Dimension::HEIGHT) )
            {
              mLabel.SetResizePolicy( ResizePolicy::FILL_TO_PARENT, Dimension::HEIGHT );
            }
            else
            {
              mLabel.SetResizePolicy( ResizePolicy::DIMENSION_DEPENDENCY, Dimension::HEIGHT );
            }
            break;
          }
          case KEY_H: // Horizontal alignment
          {
            if( ++mAlignment >= H_ALIGNMENT_STRING_COUNT )
            {
              mAlignment = 0u;
            }

            mLabel.SetProperty( TextLabel::Property::HORIZONTAL_ALIGNMENT, H_ALIGNMENT_STRING_TABLE[ mAlignment ] );
            break;
          }
          case KEY_V: // Vertical alignment
          {
            if( ++mAlignment >= V_ALIGNMENT_STRING_COUNT )
            {
              mAlignment = 0u;
            }

            mLabel.SetProperty( TextLabel::Property::VERTICAL_ALIGNMENT, V_ALIGNMENT_STRING_TABLE[ mAlignment ] );
            break;
          }
          case KEY_M: // Multi-line
          {
            bool multiLine = mLabel.GetProperty<bool>( TextLabel::Property::MULTI_LINE );
            mLabel.SetProperty( TextLabel::Property::MULTI_LINE, !multiLine );
            break;
          }
          case KEY_L: // Language
          {
            const Language& language = LANGUAGES[ mLanguageId ];

            mLabel.SetProperty( TextLabel::Property::TEXT, language.text );

            if( ++mLanguageId >= NUMBER_OF_LANGUAGES )
            {
              mLanguageId = 0u;
            }
            break;
          }
          case KEY_S: // Shadow color
          {
            if( Color::BLACK == mLabel.GetProperty<Vector4>( TextLabel::Property::SHADOW_COLOR ) )
            {
              mLabel.SetProperty( TextLabel::Property::SHADOW_COLOR, Color::RED );
            }
            else
            {
              mLabel.SetProperty( TextLabel::Property::SHADOW_COLOR, Color::BLACK );
            }
            break;
          }
          case KEY_PLUS: // Increase shadow offset
          {
            mLabel.SetProperty( TextLabel::Property::SHADOW_OFFSET, mLabel.GetProperty<Vector2>( TextLabel::Property::SHADOW_OFFSET ) + Vector2( 1.0f, 1.0f ) );
            break;
          }
          case KEY_MINUS: // Decrease shadow offset
          {
            mLabel.SetProperty( TextLabel::Property::SHADOW_OFFSET, mLabel.GetProperty<Vector2>( TextLabel::Property::SHADOW_OFFSET ) - Vector2( 1.0f, 1.0f ) );
            break;
          }

        }
      }
    }
  }

private:

  Application& mApplication;

  TextLabel mLabel;

  Control mContainer;
  Control mGrabCorner;

  PanGestureDetector mPanGestureDetector;

  Vector2 mLayoutSize;

  unsigned int mLanguageId;
  unsigned int mAlignment;
  Property::Index mHueAngleIndex;
  Property::Index mOverrideMixColorIndex;
};

void RunTest( Application& application )
{
  TextLabelExample test( application );

  application.MainLoop();
}

/** Entry point for Linux & Tizen applications */
int DALI_EXPORT_API main( int argc, char **argv )
{
  Application application = Application::New( &argc, &argv, DEMO_THEME_PATH );

  RunTest( application );

  return 0;
}