MyUITextViewDelegateImpl.ios.ts

import { ScrollEventData } from "tns-core-modules/ui/scroll-view";
import { TextView as TextViewDefinition } from "tns-core-modules/ui/text-view";
import {
    EditableTextBase, editableProperty, hintProperty, textProperty, colorProperty, placeholderColorProperty,
    borderTopWidthProperty, borderRightWidthProperty, borderBottomWidthProperty, borderLeftWidthProperty,
    paddingTopProperty, paddingRightProperty, paddingBottomProperty, paddingLeftProperty,
    Length, Color, layout, CSSType, // _updateCharactersInRangeReplacementString
} from "tns-core-modules/ui/editable-text-base";

import { profile } from "tns-core-modules/profiling";
import { TextView } from "tns-core-modules/ui/text-view";

export class MyTextView extends TextView {
    constructor(private textView: UITextView){
        super();
        this.nativeView = this.textView;
    }

    createNativeView(){
        // console.log(`createNativeView() called! this.textView:`, this.textView);
        // console.log(`createNativeView() called! this.nativeTextViewProtected:`, this.nativeTextViewProtected);
        // console.log(`createNativeView() called! this.nativeView:`, this.nativeView);
        return this.textView;
    }
}

export class MyUITextViewDelegateImpl extends NSObject implements UITextViewDelegate {
    public static ObjCProtocols = [UITextViewDelegate];

    private _owner: WeakRef<TextView>;
    // https://github.com/NativeScript/NativeScript/issues/1404#issuecomment-182402358
    private _originalDelegate: UITextViewDelegate;

    // public static initWithOwner(owner: WeakRef<TextView>): MyUITextViewDelegateImpl {
    public static initWithOwner(owner: WeakRef<TextView>): MyUITextViewDelegateImpl {
        // console.log('INITED');
        const impl = <MyUITextViewDelegateImpl>MyUITextViewDelegateImpl.new();
        impl._owner = owner;
        // console.log("INITED OWNER");
        impl._originalDelegate = <UITextViewDelegate>(<UITextView>owner.get().ios).delegate;
        // console.log("INITED ORIGINAL DELEGATE");
        return impl;
    }

    textViewShouldBeginEditing(textView: UITextView): boolean {
        console.log(`textViewShouldBeginEditing`);
        if(this._originalDelegate) return this._originalDelegate.textViewShouldBeginEditing(textView);
        else return true;
    }

    textViewDidBeginEditing(textView: UITextView) {
        console.log(`textViewDidBeginEditing`);
        if(this._originalDelegate) this._originalDelegate.textViewDidBeginEditing(textView);
    }

    textViewDidEndEditing(textView: UITextView) {
        console.log(`textViewDidEndEditing`);
        if(this._originalDelegate) this._originalDelegate.textViewDidEndEditing(textView);
    }

    onTextViewDidChange?(textView: UITextView);

    textViewDidChange(textView: UITextView) {
        if(this.onTextViewDidChange) this.onTextViewDidChange(textView);
        if(this._originalDelegate) this._originalDelegate.textViewDidChange(textView);
    }

    returnDismissesKeyboard: boolean = false;

    onTab?(textView: UITextView): boolean;

    textViewShouldChangeTextInRangeReplacementText(textView: UITextView, range: NSRange, text: string): boolean {
        // console.log(`MyUITextViewDelegateImpl.textViewShouldChangeTextInRangeReplacementText(${text})`);
        // if(text.length > 0) // FIXME: force re-layout. Otherwise copy-paste doesn't wrap.
        if(this.onTab && text === "\t"){
            return this.onTab(textView);
        } else if(this.returnDismissesKeyboard && text === "\n"){
            console.log(`textView.resignFirstResponder();`);
            textView.resignFirstResponder();
            return false;
        }
        return true;
    }
}