/*
 * Copyright (c) 2022 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 Usage of TextLabel control with style application.
 */

// EXTERNAL INCLUDES
#include <dali-toolkit/dali-toolkit.h>
#include <dali-toolkit/devel-api/controls/text-controls/text-label-devel.h>
#include <dali-toolkit/devel-api/text/text-enumerations-devel.h>
#include <dali/devel-api/actors/actor-devel.h>
#include <dali/devel-api/object/handle-devel.h>
#include <iostream>

// INTERNAL INCLUDES
#include "expanding-buttons.h"
#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 char* const STYLE_SELECTED_IMAGE = DEMO_IMAGE_DIR "FontStyleButton_OK_03.png";

const char* BUTTON_IMAGES[] =
  {
    DEMO_IMAGE_DIR "FontStyleButton_Colour.png",
    DEMO_IMAGE_DIR "FontStyleButton_Outline.png",
    DEMO_IMAGE_DIR "FontStyleButton_Shadow.png",
    DEMO_IMAGE_DIR "FontStyleButton_Background.png"};

const unsigned int KEY_ZERO  = 10;
const unsigned int KEY_ONE   = 11;
const unsigned int KEY_A     = 38;
const unsigned int KEY_F     = 41;
const unsigned int KEY_H     = 43;
const unsigned int KEY_U     = 30;
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]);

enum StyleType
{
  TEXT_COLOR = 0,
  OUTLINE,
  SHADOW,
  BACKGROUND,
  NUMBER_OF_STYLES
};

const Vector4 AVAILABLE_COLORS[] =
  {
    Color::GREEN,
    Color::BLUE,
    Color::RED,
    Color::CYAN,
    Color::WHITE // Used as clear
};

const unsigned int NUMBER_OF_COLORS = sizeof(AVAILABLE_COLORS) / sizeof(AVAILABLE_COLORS[0u]);

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

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

  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;
};

const float   STYLE_BUTTON_POSTION_RELATIVE_TO_WINDOW = 0.9f;
const float   BUTTON_SIZE_RATIO_TO_WINDOW             = 0.1f;
const float   OUTLINE_WIDTH                           = 2.0f;
const Vector2 SHADOW_OFFSET                           = Vector2(2.0f, 2.0f);
const int     GAP_BETWEEN_BUTTONS                     = 3;

} // anonymous namespace

/**
 * @brief The main class of the demo.
 */
class TextLabelExample : public ConnectionTracker
{
public:
  TextLabelExample(Application& application)
  : mApplication(application),
    mLabel(),
    mSelectedColor(AVAILABLE_COLORS[0]),
    mStyleActivatedForColor(NUMBER_OF_STYLES),
    mContainer(),
    mGrabCorner(),
    mBorder(),
    mPanGestureDetector(),
    mLayoutSize(),
    mLanguageId(0u),
    mAlignment(0u),
    mHueAngleIndex(Property::INVALID_INDEX),
    mOverrideMixColorIndex(Property::INVALID_INDEX),
    mColorButtonsHidden(true),
    mCollapseColorsAndStyles(false)
  {
    // Connect to the Application's Init signal
    mApplication.InitSignal().Connect(this, &TextLabelExample::Create);

    // Set Style flags to inactive
    for(unsigned int i = TEXT_COLOR; i < NUMBER_OF_STYLES; i++)
    {
      mStyleActiveState[i]  = false;
      mCurrentStyleColor[i] = AVAILABLE_COLORS[NUMBER_OF_COLORS - 1];
    }
  }

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

  // Clicking the expanding button shows the registered style buttons.
  void SetUpExpandingStyleButtons(Vector2 position)
  {
    mExpandingButtons = Demo::ExpandingButtons::New();
    mExpandingButtons.SetProperty(Actor::Property::POSITION, Vector2(mButtonSize.width, mWindowSize.height * STYLE_BUTTON_POSTION_RELATIVE_TO_WINDOW));
    mExpandingButtons.CollapsingSignal().Connect(this, &TextLabelExample::OnExpandingButtonCollapsing);
    mExpandingButtons.SetProperty(Actor::Property::SIZE, mButtonSize);
    // Creates the buttons to be expanded
    CreateStyleButtons();

    // Register the created buttons with the ExpandingButtons.
    for(unsigned int index = 0; index < NUMBER_OF_STYLES; index++)
    {
      mExpandingButtons.RegisterButton(mStyleButtons[index]);
    }
  }

  /**
   * One-time setup in response to Application InitSignal.
   */
  void Create(Application& application)
  {
    Window window = application.GetWindow();

    window.KeyEventSignal().Connect(this, &TextLabelExample::OnKeyEvent);
    mWindowSize = window.GetSize();
    mButtonSize = Size(mWindowSize.height * 0.1, mWindowSize.height * 0.1); // Button size 1/10 of window height

    mContainer = Control::New();
    mContainer.SetProperty(Dali::Actor::Property::NAME, "Container");
    mContainer.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
    auto size = std::min(mWindowSize.width, mWindowSize.height) * 0.6f;
    mLayoutSize = Vector2(size, size);
    mContainer.SetProperty(Actor::Property::SIZE, mLayoutSize);
    window.Add(mContainer);

    // Resize the center layout when the corner is grabbed
    mGrabCorner = ImageView::New(BACKGROUND_IMAGE);
    mGrabCorner.SetProperty(Dali::Actor::Property::NAME, "GrabCorner");
    mGrabCorner.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_CENTER);
    mGrabCorner.SetProperty(Actor::Property::PARENT_ORIGIN, 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("\xF0\x9F\x98\x89 A Quick Brown Fox Jumps Over The Lazy Dog");

    mLabel.SetProperty(Dali::Actor::Property::NAME, "TextLabel");
    mLabel.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
    mLabel.SetProperty(Actor::Property::SIZE, mLayoutSize);
    mLabel.SetProperty(TextLabel::Property::MULTI_LINE, true);
    mLabel.SetProperty(TextLabel::Property::TEXT_COLOR, Color::GREEN);
    mLabel.SetBackgroundColor(Color::WHITE);
    mContainer.Add(mLabel);

    // Clicking ExpandingButton shows the Registered Style buttons, clicking again hides them.
    Vector2 expandingButtonPosition(mButtonSize.width, mWindowSize.height * STYLE_BUTTON_POSTION_RELATIVE_TO_WINDOW);
    SetUpExpandingStyleButtons(expandingButtonPosition);
    window.Add(mExpandingButtons);

    // Add a border for the container so you can see the container is being resized while grabbing the handle.
    mBorder = Control::New();
    mBorder.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
    mBorder.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH);
    mBorder.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::HEIGHT);

    Dali::Property::Map border;
    border.Insert(Toolkit::Visual::Property::TYPE, Visual::BORDER);
    border.Insert(BorderVisual::Property::COLOR, Color::WHITE);
    border.Insert(BorderVisual::Property::SIZE, 3.f);
    mBorder.SetProperty(Control::Property::BACKGROUND, border);
    mContainer.Add(mBorder);
    mBorder.SetProperty(Actor::Property::VISIBLE, false);
    mGrabCorner.RaiseToTop();

    mHueAngleIndex      = mLabel.RegisterProperty("hue", 0.0f);
    Renderer bgRenderer = mLabel.GetRendererAt(0);

    Constraint constraint = Constraint::New<Vector3>(bgRenderer, VisualRenderer::Property::VISUAL_MIX_COLOR, 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();

    mContainer.RaiseToTop();
    mGrabCorner.RaiseToTop();

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

  // If the styling buttons should colapse (hide) then the color buttons should also hide.
  bool OnExpandingButtonCollapsing(Demo::ExpandingButtons button)
  {
    mCollapseColorsAndStyles = true;
    HideColorButtons();
    return true;
  }

  // Get the style type from the given button
  StyleType GetStyleTypeFromButton(Toolkit::Button button)
  {
    StyleType style = StyleType::TEXT_COLOR;

    if(button == mStyleButtons[StyleType::OUTLINE])
    {
      style = StyleType::OUTLINE;
    }
    else if(button == mStyleButtons[StyleType::SHADOW])
    {
      style = StyleType::SHADOW;
    }
    else if(button == mStyleButtons[StyleType::BACKGROUND])
    {
      style = StyleType::BACKGROUND;
    }
    return style;
  }

  // Style selected, show color buttons
  bool OnStyleButtonClicked(Toolkit::Button button)
  {
    StyleType selectedStyle = GetStyleTypeFromButton(button);
    if(mStyleActivatedForColor == selectedStyle)
    {
      HideColorButtons();
    }
    else
    {
      ResetColorButtons(mColorButtons, NUMBER_OF_COLORS);
      ShowColorButtons(selectedStyle);
    }
    return true;
  }

  // Set style to selected color
  bool OnColorSelected(Toolkit::Button button)
  {
    for(unsigned int index = 0; index < NUMBER_OF_COLORS; index++)
    {
      if(mColorButtons[index] == button)
      {
        mSelectedColor = AVAILABLE_COLORS[index];
      }
    }

    switch(mStyleActivatedForColor)
    {
      case TEXT_COLOR:
      {
        Animation animation = Animation::New(1.f);
        animation.AnimateTo(Property(mLabel, TextLabel::Property::TEXT_COLOR), mSelectedColor, AlphaFunction::LINEAR);
        mCurrentStyleColor[TEXT_COLOR] = mSelectedColor;
        animation.Play();
        break;
      }
      case OUTLINE:
      {
        Property::Map outlineMap;
        float         outlineWidth = OUTLINE_WIDTH;

        if(mStyleActiveState[OUTLINE])
        {
          outlineWidth = (Color::WHITE == mSelectedColor) ? 0.0f : OUTLINE_WIDTH; // toggles outline on/off
        }
        mStyleActiveState[OUTLINE] = (outlineWidth > 0.0f) ? true : false;

        outlineMap["color"]         = mSelectedColor;
        outlineMap["width"]         = outlineWidth;
        mCurrentStyleColor[OUTLINE] = mSelectedColor;
        mLabel.SetProperty(TextLabel::Property::OUTLINE, outlineMap);
        break;
      }
      case SHADOW:
      {
        Vector2         shadowOffset(SHADOW_OFFSET); // Will be set to zeros if color already set
        Property::Value value = mLabel.GetProperty(TextLabel::Property::SHADOW);
        Vector4         currentShadowColor;
        value.Get(currentShadowColor);

        if(mStyleActiveState[SHADOW])
        {
          // toggle shadow off ( zero offset ) if color is already set
          shadowOffset = (Color::WHITE == mSelectedColor) ? Vector2::ZERO : Vector2(SHADOW_OFFSET);
        }

        mStyleActiveState[SHADOW]  = (shadowOffset == Vector2::ZERO) ? false : true;
        mCurrentStyleColor[SHADOW] = mSelectedColor;

        Property::Map shadowMap;
        shadowMap.Insert("offset", shadowOffset);
        shadowMap.Insert("color", mSelectedColor);
        mLabel.SetProperty(TextLabel::Property::SHADOW, shadowMap);

        break;
      }
      case BACKGROUND:
      {
        Property::Map backgroundMap;
        auto          backgroundEnabled(true);

        if(mStyleActiveState[BACKGROUND])
        {
          backgroundEnabled = (Color::WHITE != mSelectedColor); // toggles background on/off
        }
        mStyleActiveState[BACKGROUND] = backgroundEnabled;

        backgroundMap["color"]         = mSelectedColor;
        backgroundMap["enable"]        = backgroundEnabled;
        mCurrentStyleColor[BACKGROUND] = mSelectedColor;
        mLabel.SetProperty(DevelTextLabel::Property::BACKGROUND, backgroundMap);

        break;
      }
      default:
        break;
    }

    return true;
  }

  // Set the inital color button that should be be selected.
  // If the style already has a color set then that should be used
  void SetInitialSelectedColorButton(StyleType styleButtonIndex)
  {
    Vector4 selectedColor = mCurrentStyleColor[styleButtonIndex];

    for(unsigned int i = 0; i < NUMBER_OF_COLORS; i++)
    {
      if(AVAILABLE_COLORS[i] == selectedColor)
      {
        if(mColorButtons[i])
        {
          mColorButtons[i].SetProperty(Toolkit::Button::Property::SELECTED, true);
        }
        break;
      }
    }
  }

  // Create a bar of color buttons that the user can select.
  void ShowColorButtons(StyleType styleButtonIndex)
  {
    mCollapseColorsAndStyles = false; // Request to show colors so reset flag
    mStyleActivatedForColor  = styleButtonIndex;

    for(unsigned int index = 0; index < NUMBER_OF_COLORS; index++)
    {
      if(!mColorButtonsAnimation)
      {
        mColorButtonsAnimation = Animation::New(0.15f);
        mColorButtonsAnimation.FinishedSignal().Connect(this, &TextLabelExample::OnColorButtonAnimationFinished);
      }

      // Create a color button
      if(!mColorButtons[index])
      {
        mColorButtons[index] = RadioButton::New();
        mColorButtons[index].SetProperty(Actor::Property::SIZE, mButtonSize);
        mColorButtons[index].ClickedSignal().Connect(this, &TextLabelExample::OnColorSelected);
        mColorButtons[index].SetProperty(Button::Property::TOGGLABLE, true);
        Property::Map propertyMap;
        propertyMap.Insert(Visual::Property::TYPE, Visual::COLOR);
        propertyMap.Insert(ColorVisual::Property::MIX_COLOR, AVAILABLE_COLORS[index]);
        mColorButtons[index].SetProperty(Toolkit::Button::Property::UNSELECTED_BACKGROUND_VISUAL, propertyMap);
        mColorButtons[index].SetProperty(Toolkit::Button::Property::UNSELECTED_VISUAL, propertyMap);
        mColorButtons[index].SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_CENTER);
        mColorButtons[index].SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::BOTTOM_CENTER);

        propertyMap.Insert(Visual::Property::TYPE, Visual::COLOR);
        propertyMap.Insert(ColorVisual::Property::MIX_COLOR, AVAILABLE_COLORS[index]);
        mColorButtons[index].SetProperty(Toolkit::Button::Property::SELECTED_BACKGROUND_VISUAL, propertyMap);

        mColorButtons[index].SetProperty(Toolkit::Button::Property::SELECTED_VISUAL,
                                         Property::Map().Add(Visual::Property::TYPE, Visual::BORDER).Add(BorderVisual::Property::COLOR, Color::WHITE).Add(BorderVisual::Property::SIZE, 4.0f).Add(BorderVisual::Property::ANTI_ALIASING, true));

        // Use a white button with 50% transparency as a clear color button
        if(Color::WHITE == AVAILABLE_COLORS[index] && styleButtonIndex != StyleType::TEXT_COLOR)
        {
          mColorButtons[index].SetProperty(Actor::Property::OPACITY, 0.5f);

          mColorButtons[index].SetProperty(Toolkit::Button::Property::LABEL,
                                           Property::Map().Add(Toolkit::Visual::Property::TYPE, Toolkit::Visual::TEXT).Add(Toolkit::TextVisual::Property::HORIZONTAL_ALIGNMENT, HorizontalAlignment::CENTER).Add(Toolkit::TextVisual::Property::TEXT, "off"));
        }
      }

      SetInitialSelectedColorButton(mStyleActivatedForColor);

      mColorButtons[index].Unparent();

      mStyleButtons[styleButtonIndex].Add(mColorButtons[index]);
      mColorButtons[index].Lower();

      // Position button using nice animation
      mColorButtons[index].SetProperty(Actor::Property::POSITION_Y, -GAP_BETWEEN_BUTTONS);
      float         desiredPosition      = -(mButtonSize.height + GAP_BETWEEN_BUTTONS) * (index);
      AlphaFunction focusedAlphaFunction = AlphaFunction(Vector2(0.32f, 0.08f), Vector2(0.38f, 1.72f));
      mColorButtonsAnimation.AnimateBy(Property(mColorButtons[index], Actor::Property::POSITION_Y), desiredPosition, focusedAlphaFunction);
    }

    mColorButtonsHidden = false;
    mColorButtonsAnimation.Play();
  }

  // Remove the color buttons when not being shown.
  void ResetColorButtons(Button buttons[], unsigned int numberOfButtons)
  {
    for(unsigned int index = 0; index < numberOfButtons; index++)
    {
      UnparentAndReset(buttons[index]);
    }
  }

  void OnColorButtonAnimationFinished(Animation& animation)
  {
    animation.Clear();
    if(mColorButtonsHidden)
    {
      ResetColorButtons(mColorButtons, NUMBER_OF_COLORS);
      animation.Reset(); // Handle reset
      if(mCollapseColorsAndStyles)
      {
        mExpandingButtons.Collapse();
      }
    }
  }

  // Create the style buttons that will expand from the expanding button.
  void CreateStyleButtons()
  {
    for(unsigned int index = 0; index < NUMBER_OF_STYLES; index++)
    {
      if(!mStyleButtons[index])
      {
        mStyleButtons[index] = PushButton::New();
        mStyleButtons[index].SetProperty(Toolkit::Button::Property::UNSELECTED_BACKGROUND_VISUAL, BUTTON_IMAGES[index]);
        mStyleButtons[index].SetProperty(Toolkit::Button::Property::SELECTED_BACKGROUND_VISUAL, STYLE_SELECTED_IMAGE);
        mStyleButtons[index].SetProperty(Dali::Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
        mStyleButtons[index].SetProperty(Actor::Property::SIZE, mButtonSize);
        mStyleButtons[index].ClickedSignal().Connect(this, &TextLabelExample::OnStyleButtonClicked);
      }
    }
  }

  // Animate away the color bar.
  void HideColorButtons()
  {
    if(!mColorButtonsHidden)
    {
      for(unsigned int index = 0; index < NUMBER_OF_COLORS; index++)
      {
        mColorButtonsAnimation.AnimateTo(Property(mColorButtons[index], Actor::Property::POSITION_Y), 0.0f);
      }
      mColorButtonsHidden = true;
      mColorButtonsAnimation.Play();
    }
    mStyleActivatedForColor = NUMBER_OF_STYLES;
  }

  //  Request the expanding button to collapse.
  void HideStyleAndColorButtons()
  {
    mCollapseColorsAndStyles = true;
    if(mColorButtonsHidden)
    {
      mExpandingButtons.Collapse();
    }
    else
    {
      HideColorButtons();
    }
  }

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

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

      // Only show the border during the panning
      mBorder.SetProperty(Actor::Property::VISIBLE, true);

      HideStyleAndColorButtons();
    }

    const Vector2& displacement = gesture.GetDisplacement();
    mLayoutSize.x += displacement.x * 2.0f;
    mLayoutSize.y += displacement.y * 2.0f;

    if(mLayoutSize.x >= 2.0f ||
       mLayoutSize.y >= 2.0f)
    {
      mLayoutSize.x = std::min(mLayoutSize.x, mWindowSize.width);
      mLayoutSize.y = std::min(mLayoutSize.y, mWindowSize.height * .9f);

      // 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.SetProperty(Actor::Property::SIZE, clampedSize);
    }

    if(state == GestureState::CANCELLED || state == GestureState::FINISHED)
    {
      // Resize the text label to match the container size when panning is finished
      mLabel.SetProperty(Actor::Property::SIZE, mLayoutSize);
      mBorder.SetProperty(Actor::Property::VISIBLE, false);
    }
  }

  /**
   * Main key event handler
   */
  void OnKeyEvent(const KeyEvent& event)
  {
    if(event.GetState() == KeyEvent::DOWN)
    {
      if(IsKey(event, DALI_KEY_ESCAPE) || IsKey(event, DALI_KEY_BACK))
      {
        mApplication.Quit();
      }
      else if(event.IsCtrlModifier())
      {
        switch(event.GetKeyCode())
        {
          // Select rendering back-end
          case KEY_ZERO: // fall through
          case KEY_ONE:
          {
            mLabel.SetProperty(DevelTextLabel::Property::RENDERING_BACKEND, event.GetKeyCode() - 10);
            break;
          }
          case KEY_A: // Animate text colour
          {
            Animation animation = Animation::New(2.f);
            animation.AnimateTo(Property(mLabel, TextLabel::Property::TEXT_COLOR), Color::RED, AlphaFunction::SIN);
            animation.SetLoopCount(3);
            animation.Play();
            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
          {
            Property::Value value = mLabel.GetProperty(TextLabel::Property::SHADOW);
            Vector4         shadowColor;
            value.Get(shadowColor);
            Property::Map shadowMap;
            if(Color::BLACK == shadowColor)
            {
              shadowMap.Insert("color", Color::RED);
              mLabel.SetProperty(TextLabel::Property::SHADOW, shadowMap);
            }
            else
            {
              shadowMap.Insert("color", Color::BLACK);
              mLabel.SetProperty(TextLabel::Property::SHADOW, shadowMap);
            }
            break;
          }
          case KEY_U: // Markup
          {
            mLabel.SetProperty(TextLabel::Property::ENABLE_MARKUP, true);
            mLabel.SetProperty(TextLabel::Property::TEXT, "<font family='DejaVuSerif' size='18'>H<color value='blue'>ello</color> <font weight='bold'>world</font> demo</font>");
            break;
          }
          case KEY_PLUS: // Increase shadow offset
          {
            Property::Value value = mLabel.GetProperty(TextLabel::Property::SHADOW);
            Vector2         shadowOffset;
            value.Get(shadowOffset);
            shadowOffset += Vector2(1.0f, 1.0f);

            Property::Map shadowMap;
            shadowMap.Insert("offset", shadowOffset);
            mLabel.SetProperty(TextLabel::Property::SHADOW, shadowMap);
            break;
          }
          case KEY_MINUS: // Decrease shadow offset
          {
            Property::Value value = mLabel.GetProperty(TextLabel::Property::SHADOW);
            Vector2         shadowOffset;
            value.Get(shadowOffset);
            shadowOffset -= Vector2(1.0f, 1.0f);

            Property::Map shadowMap;
            shadowMap.Insert("offset", shadowOffset);
            mLabel.SetProperty(TextLabel::Property::SHADOW, shadowMap);
            break;
          }
        }
      }
    }
  }

private:
  Application& mApplication;

  TextLabel mLabel;

  Demo::ExpandingButtons mExpandingButtons;
  PushButton             mStyleButtons[NUMBER_OF_STYLES];
  bool                   mStyleActiveState[NUMBER_OF_STYLES];

  Vector4 mCurrentStyleColor[NUMBER_OF_STYLES];

  Vector4 mSelectedColor;

  Button mColorButtons[NUMBER_OF_COLORS];

  StyleType mStyleActivatedForColor; // The style that the color bar is connected to

  Control mContainer;
  Control mGrabCorner;
  Control mBorder;

  PanGestureDetector mPanGestureDetector;

  Vector2 mLayoutSize;

  Animation mColorButtonsAnimation;

  Size mWindowSize;
  Size mButtonSize;

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

  bool mColorButtonsHidden;
  bool mCollapseColorsAndStyles;
};

int DALI_EXPORT_API main(int argc, char** argv)
{
  Application      application = Application::New(&argc, &argv, DEMO_THEME_PATH);
  TextLabelExample test(application);
  application.MainLoop();
  return 0;
}