If I paste something in an Entry, it doesn't fire Trigger

EnricoRossini

Hi guys,
I have an Entry with some Triggers. One of them is checking is an email is valid. The problem is that a user pastes an email, the Entry doesn't fire the Triggers.

How can I update an Entry in this case?

I tried to prevent Cut, Paste or Copy but it doesn't work.

iOS

[assembly: ExportRenderer(typeof(Entry), typeof(EntryCustomRenderer))]
namespace MyProject.iOS.Renderers
{
    /// <summary> 
    /// Entry extra renderer. 
    /// </summary> 
    public class EntryCustomRenderer : EntryRenderer
    {
        [...]

        public override bool CanPerform(ObjCRuntime.Selector action, Foundation.NSObject withSender)
        {
            if (action.Name == "paste:" || action.Name == "copy:" || action.Name == "cut:")
                return false;

            return base.CanPerform(action, withSender);
        }
    }
}

Android

Callback

namespace MyProject.Droid.Renderers
{
    public class Callback : Java.Lang.Object, ActionMode.ICallback
    {
        public bool OnActionItemClicked(ActionMode mode, IMenuItem item)
        {
            return false;
        }

        public bool OnCreateActionMode(ActionMode mode, IMenu menu)
        {
            return false;
        }

        public void OnDestroyActionMode(ActionMode mode)
        {
        }

        public bool OnPrepareActionMode(ActionMode mode, IMenu menu)
        {
            return false;
        }
    }
}

EntryRender

public class EntryCustomRenderer : EntryRenderer
{
    protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
    {
        base.OnElementChanged(e);
        [...]

        // prevent copy/paste
        Control.CustomSelectionActionModeCallback = new Callback();
    }
}

Thanks in advance

JohnHardman

@EnricoRossini - I remove Cut and Paste options using the following (excuse the magic numbers):

For iOS:

    public override bool CanPerform(ObjCRuntime.Selector action, NSObject withSender)
    {
        if ((action == new ObjCRuntime.Selector("paste:"))
            || (action == new ObjCRuntime.Selector("cut:")))
        {
            return false;
        }
        else
            return base.CanPerform(action, withSender);
    }

For Android:

    public bool OnCreateActionMode(ActionMode mode, IMenu menu)
    {
        // Cut - 16908320
        // Copy - 16908321
        // Paste - 16908322
        // Share - 16908341

        if (menu != null)
        {
            menu.RemoveItem(16908320); // cut - 1020020 hex
            menu.RemoveItem(16908322); // paste - 1020022 hex
        }

        return true;
    }

EnricoRossini

Thank @JohnHardman
I applied your code but I have the same result. See the attach. I replaced my code in Callback with yours.

JohnHardman

@EnricoRossini - I cannot remember why (I should have commented it), but for Android, I put the callback handling in my main Activity class, and then in my custom Entry renderer, did:

            FormsEditText nativeEntryEditText = Control;
            nativeEntryEditText.CustomSelectionActionModeCallback = MyAppAndroid.MainActivity.TheInstance;

That doesn't look like something I would have done without a good reason :-) Might be worth a try.

EnricoRossini

In my MainActivity I put the callback

public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
    public static UI.Forms.App formsApp;

    protected override void OnCreate(Bundle bundle)
    {
        [...]
    }

    public class MyCallback : Java.Lang.Object, ActionMode.ICallback
    {
        public bool OnActionItemClicked(ActionMode mode, IMenuItem item)
        {
            return false;
        }

        public bool OnCreateActionMode(ActionMode mode, IMenu menu)
        {
            // Cut - 16908320
            // Copy - 16908321
            // Paste - 16908322
            // Share - 16908341

            if (menu != null)
            {
                menu.RemoveItem(16908320); // cut - 1020020 hex
                menu.RemoveItem(16908322); // paste - 1020022 hex
            }

            return true;
        }

        public void OnDestroyActionMode(ActionMode mode)
        {
        }

        public bool OnPrepareActionMode(ActionMode mode, IMenu menu)
        {
            return false;
        }
    }
}

In my EntryCustomRenderer I wrote

public class EntryCustomRenderer : EntryRenderer
{
    protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
    {
        base.OnElementChanged(e);

        if (Control != null)
        {
            [...]

            EntryEditText nativeEntryEditText = Control;
            nativeEntryEditText.CustomSelectionActionModeCallback = new MainActivity.MyCallback();
        }
    }

    protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        base.OnElementPropertyChanged(sender, e);
    }
}

I can paste everything.

JohnHardman

@EnricoRossini - I'm afraid I don't remember what more (if anything) I had to do on Android to remove Cut & Paste. Whilst I have it working, I don't have time right now to work out what else in my codebase might have affected this.

Is the other code above working for you on iOS?

EnricoRossini

In iOS action has a lot of Name

cut:
copy:
select:
selectAll:
delete:
_promptForReplace:
_transliterateChinese:
_insertDrawing:
_showTextStyleOptions:
_lookup:
_define:
_addShortcut:
_accessibilitySpeak:
_accessibilitySpeakLanguageSelection:
_accessibilityPauseSpeaking:
_share:
makeTextWritingDirectionRightToLeft:
makeTextWritingDirectionLeftToRight:

But paste is not in the list. Then when an entry has a long press, it displays Paste

SivaShankarArumugam

@EnricoRossini did you find any solution to disable paste function

noob8129

@EnricoRossini @SivaShankarArumugam Were you guys able to hide paste? I'm having this issue now.