src/XSF/Tizen.Wearable.CircularUI.Forms/ContentButton.cs

   1 /*
   2  * Copyright (c) 2018 Samsung Electronics Co., Ltd All Rights Reserved
   3  *
   4  * Licensed under the Flora License, Version 1.1 (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://floralicense.org/license/
   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.ComponentModel;
  19 using System.Windows.Input;
  20 using Xamarin.Forms;
  21
  22 namespace Tizen.Wearable.CircularUI.Forms
  23 {
  24     /// <summary>
  25     /// The ContentButton is a Button, which allows you to customize the View to be displayed.
  26     /// </summary>
  27     /// <since_tizen> 4 </since_tizen>
  28     public class ContentButton : ContentView, IButtonController
  29     {
  30         /// <summary>
  31         /// BindableProperty. Identifies the Command bindable property.
  32         /// </summary>
  33         /// <since_tizen> 4 </since_tizen>
  34         public static readonly BindableProperty CommandProperty = BindableProperty.Create(nameof(Command), typeof(ICommand), typeof(ContentButton), null,
  35             propertyChanging: OnCommandChanging, propertyChanged: OnCommandChanged);
  36
  37         /// <summary>
  38         /// BindableProperty. Identifies the CommandParameter bindable property.
  39         /// </summary>
  40         /// <since_tizen> 4 </since_tizen>
  41         public static readonly BindableProperty CommandParameterProperty = BindableProperty.Create(nameof(CommandParameter), typeof(object), typeof(ContentButton), null,
  42             propertyChanged: (bindable, oldvalue, newvalue) => CommandCanExcuteChanged(bindable, EventArgs.Empty));
  43
  44         /// <summary>
  45         /// Gets or sets command that is executed when the button is clicked.
  46         /// </summary>
  47         /// <since_tizen> 4 </since_tizen>
  48         public ICommand Command
  49         {
  50             get => (ICommand)GetValue(CommandProperty);
  51             set => SetValue(CommandProperty, value);
  52         }
  53
  54         /// <summary>
  55         /// Gets or sets command paramter that is executed when the button is clicked.
  56         /// </summary>
  57         /// <since_tizen> 4 </since_tizen>
  58         public object CommandParameter
  59         {
  60             get => GetValue(CommandParameterProperty);
  61             set => SetValue(CommandParameterProperty, value);
  62         }
  63
  64         /// <summary>
  65         /// Occurs when the button is clicked.
  66         /// </summary>
  67         /// <since_tizen> 4 </since_tizen>
  68         public event EventHandler Clicked;
  69
  70         /// <summary>
  71         /// Occurs when the button is pressed.
  72         /// </summary>
  73         /// <since_tizen> 4 </since_tizen>
  74         public event EventHandler Pressed;
  75
  76         /// <summary>
  77         /// Occurs when the button is released.
  78         /// </summary>
  79         /// <since_tizen> 4 </since_tizen>
  80         public event EventHandler Released;
  81
  82         bool IsEnabledCore
  83         {
  84             set => SetValueCore(IsEnabledProperty, value);
  85         }
  86
  87         /// <summary>
  88         /// For internal use.
  89         /// </summary>
  90         [EditorBrowsable(EditorBrowsableState.Never)]
  91         public void SendClicked()
  92         {
  93             if (IsEnabled)
  94             {
  95                 Command?.Execute(CommandParameter);
  96                 Clicked?.Invoke(this, EventArgs.Empty);
  97             }
  98         }
  99
 100         /// <summary>
 101         /// For internal use.
 102         /// </summary>
 103         [EditorBrowsable(EditorBrowsableState.Never)]
 104         public void SendPressed()
 105         {
 106             if (IsEnabled)
 107             {
 108                 Pressed?.Invoke(this, EventArgs.Empty);
 109             }
 110         }
 111
 112         /// <summary>
 113         /// For internal use.
 114         /// </summary>
 115         [EditorBrowsable(EditorBrowsableState.Never)]
 116         public void SendReleased()
 117         {
 118             if (IsEnabled)
 119             {
 120                 Released?.Invoke(this, EventArgs.Empty);
 121             }
 122         }
 123
 124         protected override void OnBindingContextChanged()
 125         {
 126             base.OnBindingContextChanged();
 127
 128             View content = Content;
 129             if (content != null)
 130             {
 131                 SetInheritedBindingContext(content, BindingContext);
 132             }
 133         }
 134
 135         static void OnCommandChanged(BindableObject bindable, object oldCommand, object newCommand)
 136         {
 137             ContentButton button = (ContentButton)bindable;
 138             if (newCommand is ICommand command)
 139             {
 140                 command.CanExecuteChanged += button.OnCommandCanExecuteChanged;
 141             }
 142             CommandChanged(button);
 143         }
 144
 145         static void CommandChanged(ContentButton button)
 146         {
 147             if(button.Command != null)
 148             {
 149                 CommandCanExcuteChanged(button, EventArgs.Empty);
 150             }
 151             else
 152             {
 153                 button.IsEnabledCore = true;
 154             }
 155         }
 156
 157         static void OnCommandChanging(BindableObject bindable, object oldCommand, object newCommand)
 158         {
 159             ContentButton button = (ContentButton)bindable;
 160             if (oldCommand != null)
 161             {
 162                 (oldCommand as ICommand).CanExecuteChanged -= button.OnCommandCanExecuteChanged;
 163             }
 164         }
 165
 166         static void CommandCanExcuteChanged(object sender, EventArgs e)
 167         {
 168             var button = (ContentButton)sender;
 169             if (button.Command != null)
 170             {
 171                 button.IsEnabledCore = button.Command.CanExecute(button.CommandParameter);
 172             }
 173         }
 174
 175         void OnCommandCanExecuteChanged(object sender, EventArgs e)
 176         {
 177             ContentButton button = (ContentButton)sender;
 178             if (button.Command != null)
 179             {
 180                 button.IsEnabledCore = button.Command.CanExecute(button.CommandParameter);
 181             }
 182         }
 183     }
 184 }