plugins/dali-swig/examples/scroll-view.cs

   1 /*
   2  * Copyright (c) 2016 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 using System;
  19 using System.Runtime.InteropServices;
  20 using Dali;
  21
  22 namespace MyCSharpExample
  23 {
  24     class Example
  25     {
  26         [UnmanagedFunctionPointer(CallingConvention.StdCall)]
  27         delegate void CallbackDelegate(IntPtr data);
  28
  29         [UnmanagedFunctionPointer(CallingConvention.StdCall)]
  30         delegate void ActorCallbackDelegate(IntPtr data);
  31
  32         private Dali.Application _application;
  33         private ScrollView _scrollView;
  34         private ScrollBar _scrollBar;
  35
  36         public Example(Dali.Application application)
  37         {
  38             _application = application;
  39
  40             CallbackDelegate initializeCallback = new CallbackDelegate( Initialize );
  41             _application.InitSignal().Connect( initializeCallback );
  42         }
  43
  44         private void Initialize(IntPtr appPtr)
  45         {
  46             CreateScrollView();
  47         }
  48
  49         private void CreateScrollView()
  50         {
  51             Stage stage = Stage.GetCurrent();
  52             stage.SetBackgroundColor(NDalic.WHITE);
  53
  54             // Create a scroll view
  55             _scrollView = new ScrollView();
  56             Vector2 stageSize = stage.GetSize();
  57             _scrollView.Size = new Vector3(stageSize.x, stageSize.y, 0.0f);
  58             _scrollView.ParentOrigin = NDalic.ParentOriginCenter;
  59             _scrollView.AnchorPoint = NDalic.AnchorPointCenter;
  60             stage.Add(_scrollView);
  61
  62             // Add actors to a scroll view with 3 pages
  63             int pageRows = 1;
  64             int pageColumns = 3;
  65             for(int pageRow = 0; pageRow < pageRows; pageRow++)
  66             {
  67                 for(int pageColumn = 0; pageColumn < pageColumns; pageColumn++)
  68                 {
  69                     Control pageActor = new Control();
  70                     pageActor.SetResizePolicy(ResizePolicyType.FILL_TO_PARENT, DimensionType.ALL_DIMENSIONS);
  71                     pageActor.ParentOrigin = NDalic.ParentOriginCenter;
  72                     pageActor.AnchorPoint = NDalic.AnchorPointCenter;
  73                     pageActor.Position = new Vector3(pageColumn * stageSize.x, pageRow * stageSize.y, 0.0f);
  74
  75                     // Add images in a 3x4 grid layout for each page
  76                     int imageRows = 4;
  77                     int imageColumns = 3;
  78                     float margin = 10.0f;
  79                     Vector3 imageSize = new Vector3((stageSize.x / imageColumns) - margin, (stageSize.y / imageRows) - margin, 0.0f);
  80
  81                     for(int row = 0; row < imageRows; row++)
  82                     {
  83                         for(int column = 0; column < imageColumns;column++)
  84                         {
  85                             int imageId = (row * imageColumns + column) % 2 + 1;
  86                             ImageView imageView = new ImageView("images/image-" + imageId + ".jpg");
  87                             imageView.ParentOrigin = NDalic.ParentOriginCenter;
  88                             imageView.AnchorPoint = NDalic.AnchorPointCenter;
  89                             imageView.Size = imageSize;
  90                             imageView.Position = new Vector3( margin * 0.5f + (imageSize.x + margin) * column - stageSize.x * 0.5f + imageSize.x * 0.5f,
  91                                                    margin * 0.5f + (imageSize.y + margin) * row - stageSize.y * 0.5f + imageSize.y * 0.5f, 0.0f );
  92                             pageActor.Add(imageView);
  93                         }
  94                     }
  95
  96                     _scrollView.Add(pageActor);
  97                 }
  98             }
  99
 100             _scrollView.SetAxisAutoLock(true);
 101
 102             // Set scroll view to have 3 pages in X axis and allow page snapping,
 103             // and also disable scrolling in Y axis.
 104             RulerPtr scrollRulerX = new RulerPtr(new FixedRuler(stageSize.width));
 105             RulerPtr scrollRulerY = new RulerPtr(new DefaultRuler());
 106             scrollRulerX.SetDomain(new RulerDomain(0.0f, stageSize.width * pageColumns, true));
 107             scrollRulerY.Disable();
 108             _scrollView.SetRulerX(scrollRulerX);
 109             _scrollView.SetRulerY(scrollRulerY);
 110
 111             // Create a horizontal scroll bar in the bottom of scroll view (which is optional)
 112             _scrollBar = new ScrollBar();
 113             _scrollBar.ParentOrigin = NDalic.ParentOriginBottomLeft;
 114             _scrollBar.AnchorPoint = NDalic.AnchorPointTopLeft;
 115             _scrollBar.SetResizePolicy(ResizePolicyType.FIT_TO_CHILDREN, DimensionType.WIDTH);
 116             _scrollBar.SetResizePolicy(ResizePolicyType.FILL_TO_PARENT, DimensionType.HEIGHT);
 117             _scrollBar.Orientation = new Quaternion( new Radian( new Degree( 270.0f ) ), Vector3.ZAXIS );
 118             _scrollBar.SetScrollDirection(ScrollBar.Direction.Horizontal);
 119             _scrollView.Add(_scrollBar);
 120
 121             // Connect to the OnRelayout signal
 122             ActorCallbackDelegate ScrollViewRelayoutCallback = new ActorCallbackDelegate( OnScrollViewRelayout );
 123             _scrollView.OnRelayoutSignal().Connect( ScrollViewRelayoutCallback );
 124         }
 125
 126         private void OnScrollViewRelayout(IntPtr data)
 127         {
 128           // Set the correct scroll bar size after size negotiation of scroll view is done
 129             _scrollBar.Size = new Vector3(0.0f, _scrollView.GetRelayoutSize(DimensionType.WIDTH), 0.0f);
 130         }
 131
 132         public void MainLoop()
 133         {
 134             _application.MainLoop ();
 135         }
 136
 137         /// <summary>
 138         /// The main entry point for the application.
 139         /// </summary>
 140         [STAThread]
 141         static void Main(string[] args)
 142         {
 143             Example example = new Example(Application.NewApplication());
 144             example.MainLoop ();
 145         }
 146     }
 147 }