examples/text-overlap/text-overlap-example.cpp

   1
   2 /*
   3  * Copyright (c) 2020 Samsung Electronics Co., Ltd.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  * http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include "text-overlap-example.h"
  19 #include <dali-toolkit/dali-toolkit.h>
  20 #include <dali/devel-api/actors/actor-devel.h>
  21
  22 #include <iostream>
  23
  24 using namespace Dali;
  25 using namespace Dali::Toolkit;
  26
  27 static const int NUMBER_OF_LABELS(2);
  28
  29 namespace Demo
  30 {
  31 TextOverlapController::TextOverlapController(Application& app)
  32 : mApplication(app),
  33   mTopmostLabel(1)
  34 {
  35   app.InitSignal().Connect(this, &TextOverlapController::Create);
  36   app.TerminateSignal().Connect(this, &TextOverlapController::Destroy);
  37 }
  38
  39 void TextOverlapController::Create(Application& app)
  40 {
  41   Window window = app.GetWindow();
  42   window.KeyEventSignal().Connect(this, &TextOverlapController::OnKeyEvent);
  43
  44   Vector2 windowSize = window.GetSize();
  45
  46   mLabels[0] = TextLabel::New("Text Label 1");
  47   mLabels[1] = TextLabel::New("Text Label 2");
  48
  49   mLabels[0].SetProperty(Dali::Actor::Property::NAME, "Label1");
  50   mLabels[1].SetProperty(Dali::Actor::Property::NAME, "Label2");
  51
  52   mLabels[0].SetProperty(Dali::DevelActor::Property::SIBLING_ORDER, 1);
  53   mLabels[1].SetProperty(Dali::DevelActor::Property::SIBLING_ORDER, 2);
  54
  55   mLabels[0].SetProperty(Control::Property::BACKGROUND, Color::RED);
  56   mLabels[1].SetProperty(Control::Property::BACKGROUND, Color::YELLOW);
  57
  58   for(int i = 0; i < NUMBER_OF_LABELS; ++i)
  59   {
  60     mLabels[i].SetProperty(TextLabel::Property::HORIZONTAL_ALIGNMENT, "CENTER");
  61     mLabels[i].SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_LEFT);
  62     mLabels[i].SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_LEFT);
  63     mLabels[i].SetProperty(Actor::Property::POSITION, Vector2(0, (i * 2 + 1) * windowSize.height * 0.25f));
  64   }
  65
  66   window.Add(mLabels[0]);
  67   window.Add(mLabels[1]);
  68
  69   mSwapButton = PushButton::New();
  70   mSwapButton.SetProperty(Button::Property::LABEL, "Swap depth order");
  71   mSwapButton.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::BOTTOM_CENTER);
  72   mSwapButton.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::BOTTOM_CENTER);
  73   mSwapButton.ClickedSignal().Connect(this, &TextOverlapController::OnClicked);
  74   mSwapButton.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::WIDTH);
  75   mSwapButton.SetResizePolicy(ResizePolicy::USE_NATURAL_SIZE, Dimension::HEIGHT);
  76   window.Add(mSwapButton);
  77
  78   Layer rootLayer = window.GetRootLayer();
  79   rootLayer.SetProperty(Dali::Actor::Property::NAME, "RootLayer");
  80
  81   mPanDetector = PanGestureDetector::New();
  82   mPanDetector.Attach(rootLayer);
  83   mPanDetector.AddAngle(Radian(-0.5f * Math::PI));
  84   mPanDetector.AddAngle(Radian(0.5f * Math::PI));
  85   mPanDetector.DetectedSignal().Connect(this, &TextOverlapController::OnPan);
  86 }
  87
  88 void TextOverlapController::OnPan(Actor actor, const PanGesture& gesture)
  89 {
  90   const GestureState state = gesture.GetState();
  91   if(!mGrabbedActor || state == GestureState::STARTED)
  92   {
  93     const Vector2& gesturePosition = gesture.GetPosition();
  94     for(int i = 0; i < NUMBER_OF_LABELS; ++i)
  95     {
  96       Vector3 position = mLabels[i].GetCurrentProperty<Vector3>(Actor::Property::POSITION);
  97       Vector3 size     = mLabels[i].GetCurrentProperty<Vector3>(Actor::Property::SIZE);
  98       if(gesturePosition.y > position.y - size.y * 0.5f &&
  99          gesturePosition.y <= position.y + size.y * 0.5f)
 100       {
 101         mGrabbedActor = mLabels[i];
 102         break;
 103       }
 104     }
 105   }
 106   else if(mGrabbedActor && state == GestureState::CONTINUING)
 107   {
 108     Vector2        windowSize      = mApplication.GetWindow().GetSize();
 109     Vector3        size            = mGrabbedActor.GetCurrentProperty<Vector3>(Actor::Property::SIZE);
 110     const Vector2& gesturePosition = gesture.GetPosition();
 111
 112     float y = Clamp(gesturePosition.y, size.y * 0.5f, windowSize.y - size.y * 0.5f);
 113     mGrabbedActor.SetProperty(Actor::Property::POSITION, Vector2(0, y));
 114   }
 115   else
 116   {
 117     mGrabbedActor.Reset();
 118   }
 119 }
 120
 121 void TextOverlapController::Destroy(Application& app)
 122 {
 123   mPanDetector.DetachAll();
 124   UnparentAndReset(mLabels[0]);
 125   UnparentAndReset(mLabels[1]);
 126   mGrabbedActor.Reset();
 127 }
 128
 129 bool TextOverlapController::OnClicked(Button button)
 130 {
 131   mTopmostLabel = 1 - mTopmostLabel; // toggles between 0 and 1
 132   mLabels[mTopmostLabel].RaiseToTop();
 133   return false;
 134 }
 135
 136 void TextOverlapController::OnKeyEvent(const KeyEvent& keyEvent)
 137 {
 138   if(keyEvent.GetState() == KeyEvent::DOWN &&
 139      (IsKey(keyEvent, DALI_KEY_BACK) ||
 140       IsKey(keyEvent, DALI_KEY_ESCAPE)))
 141   {
 142     mApplication.Quit();
 143   }
 144   else
 145   {
 146     Dali::Layer l  = mApplication.GetWindow().GetRootLayer();
 147     int         so = l.GetProperty<int>(Dali::DevelActor::Property::SIBLING_ORDER);
 148     l.SetProperty(Dali::DevelActor::Property::SIBLING_ORDER, so + 1);
 149   }
 150 }
 151
 152 } // namespace Demo
 153
 154 int DALI_EXPORT_API main(int argc, char** argv)
 155 {
 156   {
 157     Application                 app = Application::New(&argc, &argv);
 158     Demo::TextOverlapController controller(app);
 159     app.MainLoop();
 160   }
 161   exit(0);
 162 }