disable-send-icon-when-editor-text-reaches-certain-length-xamarin.forms-chat

This sample demonstrates how to disable the send icon when the editor text reaches a certain length in Xamarin.Forms Chat (SfChat).

Sample

    <ContentPage.Content>
        <sfChat:SfChat x:Name="sfChat"
                       Messages="{Binding Messages}"
                       CurrentUser="{Binding CurrentUser}"   
                       ShowIncomingMessageAvatar="True"
                       ShowOutgoingMessageAvatar="True">
            <sfChat:SfChat.Behaviors>
                <local:SfChatBehavior/>
            </sfChat:SfChat.Behaviors>
        </sfChat:SfChat>
    </ContentPage.Content

Behavior:

    public class SfChatBehavior : Behavior<SfChat>
    {
        #region Fields

        private SfChat sfChat = null;

        #endregion

        #region Overrides

        protected override void OnAttachedTo(SfChat bindable)
        {
            base.OnAttachedTo(bindable);
            sfChat = bindable;
            if (sfChat != null)
            {
                sfChat.Editor.TextChanged += Editor_TextChanged;
            }
        }

        protected override void OnDetachingFrom(SfChat bindable)
        {
            base.OnAttachedTo(bindable);
            sfChat.Editor.TextChanged -= Editor_TextChanged;
            sfChat = null;
           
        }

        #endregion

        private void Editor_TextChanged(object sender, TextChangedEventArgs e)
        {
            var editorGrid = this.sfChat.GetType().GetRuntimeProperties().FirstOrDefault(x => x.Name == "FooterView").GetValue(this.sfChat) as Grid;
            var inputView = editorGrid.Children.FirstOrDefault(x => x.GetType() == typeof(MessageInputView)) as MessageInputView;
            var border = (inputView as ContentView).Content;
            var grid = (border as ContentView).Content as Grid;
            if ((sender as Editor).Text.Length >= 40)
            {
                (grid.Children[2] as SendMessageView).IsVisible = false;
            }
            else
                ((grid.Children[2] as SendMessageView)).IsVisible = true;
        }
    }

Requirements to run the demo

To run the demo, refer to System Requirements for Xamarin

Troubleshooting

Path too long exception

If you are facing path too long exception when building this example project, close Visual Studio and rename the repository to short and build the project.