test/NUITizenGallery/Examples/CollectionViewTest/CollectionViewTest7.xaml.cs

   1 /*
   2  * Copyright(c) 2021 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 using System;
  18 using System.Collections.ObjectModel;
  19 using System.ComponentModel;
  20 using Tizen.NUI;
  21 using Tizen.NUI.Binding;
  22 using Tizen.NUI.BaseComponents;
  23 using Tizen.NUI.Components;
  24 using Tizen.NUI.Components.Extension;
  25
  26 namespace NUITizenGallery
  27 {
  28     public partial class CollectionViewTest7 : ContentPage
  29     {
  30         void OnScrolling(object sender, ScrollEventArgs e)
  31         {
  32             ObservableCollection<TestItem> source = ColView.ItemsSource as ObservableCollection<TestItem>;
  33             if (source == null) return;
  34             //Reached Bound of Scroll
  35             if (e.ScrollPosition.Y == (ColView.ContentContainer.SizeHeight - ColView.SizeHeight))
  36             {
  37                 int count = source.Count;
  38                 var Rand = new Random();
  39                 for (int i = count; i < count + 20; i++)
  40                 {
  41                     source.Add(new TestItem(i,
  42                                             "Test Item",
  43                                             new Color(((float)(Rand.Next(255))/255),
  44                                                       ((float)(Rand.Next(255))/255),
  45                                                       ((float)(Rand.Next(255))/255), 1)));
  46                 }
  47             }
  48         }
  49
  50         public CollectionViewTest7()
  51         {
  52             InitializeComponent();
  53             BindingContext = new TestSourceModel(40);
  54
  55             ColView.ItemTemplate = new DataTemplate(() =>
  56             {
  57                 var item = new RecyclerViewItem()
  58                 {
  59                     WidthSpecification = LayoutParamPolicies.MatchParent,
  60                     HeightSpecification = 100,
  61                 };
  62                 item.SetBinding(View.BackgroundColorProperty, "BgColor");
  63                 var label = new TextLabel()
  64                 {
  65                     ParentOrigin = Tizen.NUI.ParentOrigin.Center,
  66                     PivotPoint = Tizen.NUI.PivotPoint.Center,
  67                     PositionUsesPivotPoint = true,
  68                 };
  69                 label.PixelSize = 30;
  70                 label.SetBinding(TextLabel.TextProperty, "Index");
  71                 item.Add(label);
  72
  73                 return item;
  74             });
  75             // Currently ScrollableBase only support Scrolling and ScrollOutOfBound event.
  76             ColView.Scrolling += OnScrolling;
  77         }
  78
  79         protected override void Dispose(DisposeTypes type)
  80         {
  81             if (Disposed)
  82             {
  83                 return;
  84             }
  85
  86             if (type == DisposeTypes.Explicit)
  87             {
  88                 RemoveAllChildren(true);
  89             }
  90
  91             base.Dispose(type);
  92         }
  93
  94         private void RemoveAllChildren(bool dispose = false)
  95         {
  96             RecursiveRemoveChildren(this, dispose);
  97         }
  98
  99         private void RecursiveRemoveChildren(View parent, bool dispose)
 100         {
 101             if (parent == null)
 102             {
 103                 return;
 104             }
 105
 106             int maxChild = (int)parent.ChildCount;
 107             for (int i = maxChild - 1; i >= 0; --i)
 108             {
 109                 View child = parent.GetChildAt((uint)i);
 110                 if (child == null)
 111                 {
 112                     continue;
 113                 }
 114
 115                 RecursiveRemoveChildren(child, dispose);
 116                 parent.Remove(child);
 117                 if (dispose)
 118                 {
 119                     child.Dispose();
 120                 }
 121             }
 122         }
 123     }
 124 }