test/NUITizenGallery/Examples/LayoutAddRemoveTest/LayoutAddRemoveTest2Page.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.Threading;
  18 using Tizen.NUI;
  19 using Tizen.NUI.BaseComponents;
  20 using Tizen.NUI.Components;
  21
  22 namespace NUITizenGallery
  23 {
  24     public partial class LayoutAddRemoveTest2Page : ContentPage
  25     {
  26         float red = 1f;
  27         public LayoutAddRemoveTest2Page()
  28         {
  29             InitializeComponent();
  30             addButton.Clicked += OnAddButtonClicked;
  31             addTaskButton.Clicked += OnAddTaskButtonClicked;
  32             removeButton.Clicked += OnRemoveButtonClicked;
  33         }
  34
  35         private void OnAddButtonClicked(object sender, ClickedEventArgs e)
  36         {
  37             linear.Add(new View
  38             {
  39                 WidthSpecification = 240,
  40                 HeightSpecification = 240,
  41                 BackgroundColor = new Color(red / 255f, 50f / 255f, 50 / 255f, 255f),
  42             });
  43
  44             red = red > 255f ? 1f : red + 50f;
  45         }
  46
  47         private void OnAddTaskButtonClicked(object sender, ClickedEventArgs e)
  48         {
  49             SynchronizationContext.Current.Post(AddButton, null);
  50         }
  51
  52         private void OnRemoveButtonClicked(object sender, ClickedEventArgs e)
  53         {
  54             if (linear.ChildCount > 0)
  55             {
  56                 linear.Remove(linear.Children[0]);
  57             }
  58         }
  59
  60         private void AddButton(object state)
  61         {
  62             linear.Add(new Button()
  63             {
  64                 Text = "Add",
  65                 HeightSpecification = LayoutParamPolicies.MatchParent,
  66             });
  67         }
  68
  69         protected override void Dispose(DisposeTypes type)
  70         {
  71             if (Disposed)
  72             {
  73                 return;
  74             }
  75
  76             if (type == DisposeTypes.Explicit)
  77             {
  78                 addButton.Clicked -= OnAddButtonClicked;
  79                 addTaskButton.Clicked -= OnAddTaskButtonClicked;
  80                 removeButton.Clicked -= OnRemoveButtonClicked;
  81                 RemoveAllChildren(true);
  82             }
  83
  84             base.Dispose(type);
  85         }
  86
  87         private void RemoveAllChildren(bool dispose = false)
  88         {
  89             RecursiveRemoveChildren(this, dispose);
  90         }
  91
  92         private void RecursiveRemoveChildren(View parent, bool dispose)
  93         {
  94             if (parent == null)
  95             {
  96                 return;
  97             }
  98
  99             int maxChild = (int)parent.ChildCount;
 100             for (int i = maxChild - 1; i >= 0; --i)
 101             {
 102                 View child = parent.GetChildAt((uint)i);
 103                 if (child == null)
 104                 {
 105                     continue;
 106                 }
 107                 RecursiveRemoveChildren(child, dispose);
 108                 parent.Remove(child);
 109                 if (dispose)
 110                 {
 111                     child.Dispose();
 112                 }
 113             }
 114         }
 115     }
 116 }