examples/drag-and-drop/drag-and-drop-example.cpp

   1 /*
   2  * Copyright (c) 2018 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 <dali-toolkit/dali-toolkit.h>
  19 #include <dali/integration-api/debug.h>
  20 #include <dali/devel-api/actors/actor-devel.h>
  21 #include <dali-toolkit/devel-api/drag-drop-detector/drag-and-drop-detector.h>
  22
  23 using namespace Dali;
  24 using Dali::Toolkit::TextLabel;
  25 using namespace Dali::Toolkit;
  26
  27 namespace
  28 {
  29 Vector4 TEXT_LABEL_COLOR[] =
  30 {
  31   Color::MAGENTA,
  32   Color::YELLOW,
  33   Color::CYAN,
  34   Color::BLUE,
  35   Color::MAGENTA,
  36   Color::YELLOW,
  37   Color::CYAN,
  38   Color::BLUE
  39 };
  40
  41 const float TEXT_LABEL_POSITION_X = 100.0f;
  42 const float TEXT_LABEL_POSITION_START_Y = 50.0f;
  43 const float TEXT_LABEL_WIDTH = 250.0f;
  44 const float TEXT_LABEL_HEIGHT = 70.0f;
  45 const unsigned int TEXT_LABEL_NUM = sizeof(TEXT_LABEL_COLOR) / sizeof(TEXT_LABEL_COLOR[0]);
  46
  47 #if defined(DEBUG_ENABLED)
  48   Debug::Filter* gDragAndDropFilter = Debug::Filter::New(Debug::NoLogging, false, "LOG_DRAG_AND_DROP_EXAMPLE");
  49 #endif
  50 }
  51
  52 //This example shows how to use drag and drop function by several simple TextActors
  53 class DragAndDropExample : public ConnectionTracker
  54 {
  55 public:
  56
  57   DragAndDropExample( Application& application )
  58   : mApplication( application ),
  59     mDragIndex(-1),
  60     mDragRealIndex(-1),
  61     mDroppedFinished(false)
  62   {
  63     // Connect to the Application's Init signal
  64     mApplication.InitSignal().Connect( this, &DragAndDropExample::Create );
  65   }
  66
  67   // The Init signal is received once (only) during the Application lifetime
  68   void Create( Application& application )
  69   {
  70     Stage stage = Stage::GetCurrent();
  71     stage.SetBackgroundColor( Color::WHITE );
  72
  73     mDragAndDropDetector = Dali::Toolkit::DragAndDropDetector::New();
  74
  75     // Respond to key events
  76     stage.KeyEventSignal().Connect( this, &DragAndDropExample::OnKeyEvent );
  77
  78     TextLabel hintText = TextLabel::New("please drag one textlabel, move and drop on other textlabel");
  79     hintText.SetPosition(0.0f, 700.0f);
  80     hintText.SetParentOrigin(ParentOrigin::TOP_LEFT);
  81     hintText.SetAnchorPoint(AnchorPoint::TOP_LEFT);
  82     hintText.SetProperty(TextLabel::Property::MULTI_LINE, true);
  83     stage.Add(hintText);
  84
  85     for(unsigned int i = 0 ; i < TEXT_LABEL_NUM; i++)
  86     {
  87       std::string str = "textlabel ";
  88       mTextLabel[i] = TextLabel::New(str + std::to_string(i));
  89       mTextLabel[i].SetParentOrigin(ParentOrigin::TOP_LEFT);
  90       mTextLabel[i].SetAnchorPoint(AnchorPoint::TOP_LEFT);
  91       mTextLabel[i].SetName("textlabel " + std::to_string(i));
  92       mTextLabel[i].SetLeaveRequired(true);
  93       mTextLabel[i].SetProperty(TextLabel::Property::HORIZONTAL_ALIGNMENT, "CENTER");
  94       mTextLabel[i].SetProperty(TextLabel::Property::VERTICAL_ALIGNMENT, "CENTER");
  95       mTextLabel[i].SetBackgroundColor(TEXT_LABEL_COLOR[i]);
  96
  97       mTextLabel[i].SetSize(TEXT_LABEL_WIDTH, TEXT_LABEL_HEIGHT);
  98       mTextLabel[i].SetPosition(TEXT_LABEL_POSITION_X, TEXT_LABEL_POSITION_START_Y + TEXT_LABEL_HEIGHT * i);
  99       mDragAndDropDetector.Attach(mTextLabel[i]);
 100
 101       mRect[i] = Rect<float>(TEXT_LABEL_POSITION_X, TEXT_LABEL_POSITION_START_Y + TEXT_LABEL_HEIGHT * i, TEXT_LABEL_WIDTH, TEXT_LABEL_HEIGHT);
 102       mOrder[i] = i;
 103
 104       stage.Add(mTextLabel[i]);
 105     }
 106
 107     mDragAndDropDetector.StartedSignal().Connect(this, &DragAndDropExample::OnStart);
 108     mDragAndDropDetector.EnteredSignal().Connect(this, &DragAndDropExample::OnEnter);
 109     mDragAndDropDetector.ExitedSignal().Connect(this, &DragAndDropExample::OnExit);
 110     mDragAndDropDetector.MovedSignal().Connect(this, &DragAndDropExample::OnMoved);
 111     mDragAndDropDetector.DroppedSignal().Connect(this, &DragAndDropExample::OnDropped);
 112     mDragAndDropDetector.EndedSignal().Connect(this, &DragAndDropExample::OnEnd);
 113   }
 114
 115   void OnKeyEvent( const KeyEvent& event )
 116   {
 117     if( event.state == KeyEvent::Down )
 118     {
 119       if ( IsKey( event, Dali::DALI_KEY_ESCAPE ) || IsKey( event, Dali::DALI_KEY_BACK ) )
 120       {
 121         mApplication.Quit();
 122       }
 123     }
 124   }
 125
 126   void OnStart(Control control, Dali::Toolkit::DragAndDropDetector detector)
 127   {
 128     DALI_LOG_INFO(gDragAndDropFilter, Debug::General, "---OnStart---\n");
 129     DALI_LOG_INFO(gDragAndDropFilter, Debug::General, "---control name is %s---\n", control.GetName().c_str());
 130
 131     control.SetOpacity(0.1f);
 132     Vector2 screenPos  = detector.GetCurrentScreenPosition();
 133     control.ScreenToLocal(mDragLocalPos.x, mDragLocalPos.y,screenPos.x, screenPos.y );
 134     Rect<float> targetRect(screenPos.x, screenPos.y, 0.0f, 0.0f);
 135
 136     for(unsigned int i = 0; i < TEXT_LABEL_NUM; i++)
 137     {
 138       if(mRect[i].Contains(targetRect))
 139       {
 140         mDragIndex = i;
 141       }
 142     }
 143
 144     mDragRealIndex = mOrder[mDragIndex];
 145   }
 146
 147   void OnEnter(Control control, Dali::Toolkit::DragAndDropDetector detector)
 148   {
 149     DALI_LOG_INFO(gDragAndDropFilter, Debug::General, "---OnEnter---\n");
 150     DALI_LOG_INFO(gDragAndDropFilter, Debug::General, "---control name is %s---\n", control.GetName().c_str());
 151   }
 152
 153   void OnExit(Control control, Dali::Toolkit::DragAndDropDetector detector)
 154   {
 155     DALI_LOG_INFO(gDragAndDropFilter, Debug::General, "---OnExit---\n");
 156     DALI_LOG_INFO(gDragAndDropFilter, Debug::General, "---control name is %s---\n", control.GetName().c_str());
 157   }
 158
 159   void OnMoved(Control control, Dali::Toolkit::DragAndDropDetector detector)
 160   {
 161     DALI_LOG_INFO(gDragAndDropFilter, Debug::Verbose, "---OnMoved---\n");
 162     DALI_LOG_INFO(gDragAndDropFilter, Debug::Verbose, "---control name is %s---\n", control.GetName().c_str());
 163     DALI_LOG_INFO(gDragAndDropFilter, Debug::Verbose, "---coordinate is (%f, %f)---\n", detector.GetCurrentScreenPosition().x, detector.GetCurrentScreenPosition().y);
 164   }
 165
 166   void OnDropped(Control control, Dali::Toolkit::DragAndDropDetector detector)
 167   {
 168     DALI_LOG_INFO(gDragAndDropFilter, Debug::General, "---OnDropped---\n");
 169     DALI_LOG_INFO(gDragAndDropFilter, Debug::General, "---control name is %s---\n", control.GetName().c_str());
 170
 171     Vector2 screenPos  = detector.GetCurrentScreenPosition();
 172     Rect<float> targetRect(screenPos.x, screenPos.y, 0.0f, 0.0f);
 173     int droppedIndex = -1;
 174     for(unsigned int i = 0; i < TEXT_LABEL_NUM; i++)
 175     {
 176       if(mRect[i].Contains(targetRect))
 177       {
 178         droppedIndex = i;
 179       }
 180     }
 181
 182     Animation mAnimation = Animation::New(0.5f);
 183
 184     if(droppedIndex > mDragIndex)
 185     {
 186       for(int i = mDragIndex + 1; i <= droppedIndex; i++)
 187       {
 188         float y = mTextLabel[mOrder[i]].GetCurrentPosition().y;
 189         mAnimation.AnimateTo(Property(mTextLabel[mOrder[i]], Actor::Property::POSITION), Vector3(TEXT_LABEL_POSITION_X, y - TEXT_LABEL_HEIGHT, 0.0f), AlphaFunction::EASE_OUT);
 190         mAnimation.Play();
 191       }
 192
 193       int tmpId = mOrder[mDragIndex];
 194       for(int i = mDragIndex; i < droppedIndex; i++)
 195       {
 196         mOrder[i] = mOrder[i+1];
 197       }
 198
 199       mOrder[droppedIndex] = tmpId;
 200     }
 201     else if(droppedIndex < mDragIndex)
 202     {
 203
 204       for(int i = mDragIndex - 1; i >= droppedIndex; i--)
 205       {
 206         float y = mTextLabel[mOrder[i]].GetCurrentPosition().y;
 207         mAnimation.AnimateTo(Property(mTextLabel[mOrder[i]], Actor::Property::POSITION), Vector3(TEXT_LABEL_POSITION_X, y + TEXT_LABEL_HEIGHT, 0.0f), AlphaFunction::EASE_OUT);
 208         mAnimation.Play();
 209       }
 210
 211       int tmpId = mOrder[mDragIndex];
 212       for(int i = mDragIndex; i > droppedIndex; i--)
 213       {
 214         mOrder[i] = mOrder[i-1];
 215       }
 216
 217       mOrder[droppedIndex] = tmpId;
 218
 219     }
 220
 221
 222     Vector2 pos = detector.GetCurrentScreenPosition();
 223     Vector2 localPos;
 224     control.GetParent().ScreenToLocal(localPos.x, localPos.y, pos.x, pos.y);
 225
 226     KeyFrames k0 = KeyFrames::New();
 227     k0.Add(0.0f, Vector3(localPos.x - mDragLocalPos.x, localPos.y - mDragLocalPos.y, 0.0f));
 228     k0.Add(1.0f, Vector3(control.GetCurrentPosition().x, control.GetCurrentPosition().y, 0.0f));
 229
 230     KeyFrames k1 = KeyFrames::New();
 231     k1.Add(0.0f, 0.1f);
 232     k1.Add(1.0f, 1.0f);
 233
 234     Animation dropAnimation = Animation::New(0.5f);
 235     dropAnimation.FinishedSignal().Connect(this, &DragAndDropExample::DropAnimationFinished);
 236     dropAnimation.AnimateBetween(Property(mTextLabel[mDragRealIndex], Actor::Property::POSITION), k0, AlphaFunction::EASE_OUT);
 237     dropAnimation.AnimateBetween(Property(mTextLabel[mDragRealIndex], DevelActor::Property::OPACITY), k1, AlphaFunction::EASE_OUT);
 238     dropAnimation.Play();
 239
 240     mDroppedFinished = true;
 241   }
 242
 243   void DropAnimationFinished(Animation& animation)
 244   {
 245     for(unsigned int i = 0 ; i < TEXT_LABEL_NUM; i++)
 246     {
 247       mDragAndDropDetector.Attach(mTextLabel[i]);
 248     }
 249   }
 250
 251   void OnEnd(Control control, Dali::Toolkit::DragAndDropDetector detector)
 252   {
 253     DALI_LOG_INFO(gDragAndDropFilter, Debug::General, "---OnEnd---\n");
 254     DALI_LOG_INFO(gDragAndDropFilter, Debug::General, "---control name is %s---\n", control.GetName().c_str());
 255
 256     control.SetOpacity(1.0f);
 257
 258     if(mDroppedFinished)
 259     {
 260       mDragAndDropDetector.DetachAll();
 261     }
 262
 263     mDroppedFinished = false;
 264   }
 265
 266 private:
 267   Application&  mApplication;
 268   Dali::Toolkit::DragAndDropDetector mDragAndDropDetector;
 269
 270   TextLabel mTextLabel[TEXT_LABEL_NUM];
 271   Rect<float> mRect[TEXT_LABEL_NUM];
 272
 273   int mOrder[TEXT_LABEL_NUM];
 274   int mDragIndex;
 275   int mDragRealIndex;
 276
 277   Vector2 mDragLocalPos;
 278
 279   bool mDroppedFinished;
 280
 281 };
 282
 283 int DALI_EXPORT_API main( int argc, char **argv )
 284 {
 285   Application application = Application::New( &argc, &argv );
 286   DragAndDropExample test( application );
 287   application.MainLoop();
 288   return 0;
 289 }