Peter M. Groen / dali-demo

/*
 * 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/control-devel.h>
#include <dali/devel-api/adaptor-framework/application-devel.h>
#include <dali/integration-api/adaptor-framework/adaptor.h>

using namespace Dali::Toolkit;

namespace Dali
{
const char* SCENE_IMAGE_1(DEMO_IMAGE_DIR "gallery-small-10.jpg");
const char* SCENE_IMAGE_2(DEMO_IMAGE_DIR "gallery-small-42.jpg");
const char* SCENE_IMAGE_3(DEMO_IMAGE_DIR "gallery-small-48.jpg");
const char* ROTATE_TEXT("-\\|/");
const float TEXT_HEIGHT = 40.0f;

void AddText(Control textContainer, std::string text, unsigned int yIndex)
{
  auto label = TextLabel::New(text);
  label.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_CENTER);
  label.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
  label.SetProperty(Actor::Property::SIZE, Vector2(300, TEXT_HEIGHT));
  label.SetProperty(Actor::Property::POSITION_Y, yIndex * TEXT_HEIGHT);
  textContainer.Add(label);
}

class PreRenderCallbackController : public ConnectionTracker
{
public:
  /**
   * @brief Constructor.
   * @param[in]  application  The application.
   */
  PreRenderCallbackController(Application& application)
  : mApplication(application),
    mWindow(),
    mTapDetector(),
    mKeepPreRender(false),
    mRotateTextCharacter(0),
    mLastRTC(-1),
    mImageActor1(),
    mImageActor2(),
    mImageActor3(),
    mAngle1Index(Property::INVALID_INDEX),
    mAngle3Index(Property::INVALID_INDEX),
    mSceneActor(),
    mSceneAnimation(),
    mSpinner()
  {
    // Connect to the Application's Init signal
    mApplication.InitSignal().Connect(this, &PreRenderCallbackController::Create);
  }

private:
  struct RotationConstraint
  {
    RotationConstraint(float sign)
    : mSign(sign)
    {
    }

    void operator()(Quaternion& current, const PropertyInputContainer& inputs)
    {
      Radian angle(inputs[0]->GetFloat());
      current = Quaternion(angle * mSign, Vector3::YAXIS);
    }

    float mSign;
  };

  /**
   * @brief Creates the scene.
   */
  void Create(Application& application)
  {
    mWindow = application.GetWindow();
    mWindow.SetBackgroundColor(Color::WHITE);
    mWindow.KeyEventSignal().Connect(this, &PreRenderCallbackController::OnKeyEvent);

    // Detect taps on the root layer.
    mTapDetector = TapGestureDetector::New();
    mTapDetector.Attach(mWindow.GetRootLayer());
    mTapDetector.DetectedSignal().Connect(this, &PreRenderCallbackController::OnTap);

    CreateAnimatingScene();

    auto textContainer = Control::New();
    textContainer.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
    AddText(textContainer, "Click to add callback", 1);
    AddText(textContainer, "Press 1 to add callback", 2);
    AddText(textContainer, "Press 2 to clear callback", 3);
    AddText(textContainer, "Press 3 to toggle keep alive", 4);

    mSpinner = TextLabel::New("");
    mSpinner.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
    mSpinner.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_LEFT);
    mSpinner.SetProperty(Actor::Property::SIZE, Vector2(100, 100));

    mWindow.Add(mSpinner);
    mWindow.Add(textContainer);

    DevelApplication::AddIdleWithReturnValue(application, MakeCallback(this, &PreRenderCallbackController::OnIdle));
  }

  void CreateAnimatingScene()
  {
    mSceneActor = Layer::New();
    mSceneActor.SetProperty(Layer::Property::BEHAVIOR, Layer::LAYER_3D);
    mSceneActor.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);

    // Create and add images to the scene actor:
    mImageActor1 = ImageView::New(SCENE_IMAGE_1);
    mImageActor2 = ImageView::New(SCENE_IMAGE_2);
    mImageActor3 = ImageView::New(SCENE_IMAGE_3);

    mImageActor1.SetResizePolicy(ResizePolicy::USE_NATURAL_SIZE, Dimension::ALL_DIMENSIONS);
    mImageActor2.SetResizePolicy(ResizePolicy::USE_NATURAL_SIZE, Dimension::ALL_DIMENSIONS);
    mImageActor3.SetResizePolicy(ResizePolicy::USE_NATURAL_SIZE, Dimension::ALL_DIMENSIONS);

    mImageActor2.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);

    mImageActor1.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER_LEFT);
    mImageActor1.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER_RIGHT);

    mImageActor3.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER_RIGHT);
    mImageActor3.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER_LEFT);

    mSceneActor.Add(mImageActor2);
    mImageActor2.Add(mImageActor1);
    mImageActor2.Add(mImageActor3);

    Property::Index angleIndex = mImageActor2.RegisterProperty("angle", Property::Value(Dali::ANGLE_30));
    Source          angleSrc(mImageActor2, angleIndex);

    Constraint constraint = Constraint::New<Quaternion>(mImageActor1, Actor::Property::ORIENTATION, RotationConstraint(-1.0f));
    constraint.AddSource(angleSrc);
    constraint.Apply();

    constraint = Constraint::New<Quaternion>(mImageActor3, Actor::Property::ORIENTATION, RotationConstraint(+1.0f));
    constraint.AddSource(angleSrc);
    constraint.Apply();

    mSceneAnimation = Animation::New(2.5f);

    // Want to animate angle from 30 => -30 and back again smoothly.
    mSceneAnimation.AnimateTo(Property(mImageActor2, angleIndex), Property::Value(-Dali::ANGLE_30), AlphaFunction::SIN);

    mSceneAnimation.SetLooping(true);
    mSceneAnimation.Play();

    mSceneActor.SetProperty(Actor::Property::SIZE, Vector2(250.0f, 250.0f));
    mSceneActor.SetProperty(Actor::Property::POSITION, Vector3(0.0f, 0.0f, 130.0f));
    Quaternion p(Degree(-6.0f), Vector3::XAXIS);
    Quaternion q(Degree(20.0f), Vector3::YAXIS);
    mSceneActor.SetProperty(Actor::Property::ORIENTATION, p * q);

    mWindow.Add(mSceneActor);
  }

  void OnTap(Actor /* actor */, const TapGesture& /* tap */)
  {
    Adaptor::Get().SetPreRenderCallback(MakeCallback(this, &PreRenderCallbackController::OnPreRender));
  }

  /**
   * @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::DALI_KEY_ESCAPE) || IsKey(event, Dali::DALI_KEY_BACK))
      {
        mApplication.Quit();
      }
      else if(event.GetKeyName().compare("1") == 0)
      {
        Adaptor::Get().SetPreRenderCallback(MakeCallback(this, &PreRenderCallbackController::OnPreRender));
      }
      else if(event.GetKeyName().compare("2") == 0)
      {
        Adaptor::Get().SetPreRenderCallback(NULL);
      }
      else if(event.GetKeyName().compare("3") == 0)
      {
        mKeepPreRender = !mKeepPreRender;
      }
    }
  }

  bool OnPreRender()
  {
    // Called from Update/Render thread
    printf("Pre-render callback\n");
    ++mRotateTextCharacter;
    return mKeepPreRender;
  }

  bool OnIdle()
  {
    // Called from Event thread on main loop
    int rotation = mRotateTextCharacter;
    if(rotation != mLastRTC)
    {
      mLastRTC = rotation;
      mSpinner.SetProperty(TextLabel::Property::TEXT, std::string(1, ROTATE_TEXT[rotation % 4]));
    }
    return true;
  }

private:
  Application&       mApplication;
  Window             mWindow;
  TapGestureDetector mTapDetector; ///< Tap detector to enable the PreRenderCallback
  bool               mKeepPreRender;
  int                mRotateTextCharacter;
  int                mLastRTC;

  // Scene objects:
  ImageView       mImageActor1;
  ImageView       mImageActor2;
  ImageView       mImageActor3;
  Property::Index mAngle1Index;
  Property::Index mAngle3Index;
  Layer           mSceneActor;
  Animation       mSceneAnimation;
  TextLabel       mSpinner;
};

} // namespace Dali

int DALI_EXPORT_API main(int argc, char** argv)
{
  Dali::Application                 application = Dali::Application::New(&argc, &argv);
  Dali::PreRenderCallbackController controller(application);
  application.MainLoop();
  return 0;
}