EditorContentView.swift

//
//  EditorContentView.swift
//  Proton
//
//  Created by Rajdeep Kwatra on 6/1/20.
//  Copyright © 2020 Rajdeep Kwatra. All rights reserved.
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//

import Foundation
import UIKit

/// Describes a view contained in `Attachment` that contains a single `EditorView`.
/// This is a helper protocol that can be applied to the view so that
/// basic properties and functions are made available on the view as passthrough.
public protocol EditorContentView: Focusable {
    var editor: EditorView { get }

    var attributedText: NSAttributedString { get set }
    var maxHeight: EditorHeight { get set }
    var boundsObserver: BoundsObserving? { get set }
    var delegate: EditorViewDelegate? { get set }

    func becomeFirstResponder() -> Bool
}

public extension EditorContentView {
    var attributedText: NSAttributedString {
        get { editor.attributedText }
        set { editor.attributedText = newValue }
    }

    func becomeFirstResponder() -> Bool {
        return editor.becomeFirstResponder()
    }

    var maxHeight: EditorHeight {
        get { editor.maxHeight }
        set { editor.maxHeight = newValue }
    }

    var boundsObserver: BoundsObserving? {
        get { editor.boundsObserver }
        set { editor.boundsObserver = newValue }
    }

    var delegate: EditorViewDelegate? {
        get { editor.delegate }
        set { editor.delegate = newValue }
    }

    func setFocus() {
        guard editor.isEditable,
              editor.frame.size != .zero
        else { return }
        
        editor.becomeFirstResponder()
    }
}