NSTextView 研究（1）

//
//  TextAttributedDesigner.swift
//  TestTextKit
//
//  Created by wuzhiqiang on 2016/10/11.
//  Copyright ? 2016年 wuzhiqiang. All rights reserved.
//

import Cocoa

public enum AttributeItemType {
    case font(NSFont)
    case paragraphStyle(NSParagraphStyle)
    case foregroundColor(NSColor)
    case backgroundColor(NSColor)
    case ligature(NSNumber)             // 是否使用连字符
    case kern(NSNumber)                 // 字距调整
    case strikethrough(NSNumber)
    case underline(NSNumber)
    case strokeColor(NSColor)
    case strokeWidth(NSNumber)
    case shadow(NSShadow)
    case textEffect(NSString)
    case attachment(NSTextAttachment)
    case link(NSURL)
    case baselineOffset(NSNumber)
    case obliqueness(NSNumber)
    case expansion(NSNumber)
    case writingDirection([NSNumber])
    case verticalGlyphForm(NSNumber)
    case markedClauseSegment(NSNumber)
    case textAlternatives(NSTextAlternatives)
    case spellingState(NSNumber)
    case cursor(NSNumber)
    case toolTip(NSString?)
    
    public var key: String {
        switch self {
        case .font: return NSFontAttributeName
        case .paragraphStyle: return NSParagraphStyleAttributeName
        case .foregroundColor: return NSForegroundColorAttributeName
        case .backgroundColor: return NSBackgroundColorAttributeName
        case .ligature: return NSLigatureAttributeName
        case .kern: return NSKernAttributeName
        case .strikethrough: return NSStrikethroughStyleAttributeName
        case .underline: return NSUnderlineStyleAttributeName
        case .strokeColor: return NSStrokeColorAttributeName
        case .strokeWidth: return NSStrokeWidthAttributeName
        case .shadow: return  NSShadowAttributeName
        case .textEffect: return NSTextEffectAttributeName
        case .attachment: return NSAttachmentAttributeName
        case .link: return NSLinkAttributeName
        case .baselineOffset: return NSBaselineOffsetAttributeName
        case .obliqueness: return NSObliquenessAttributeName
        case .expansion: return NSExpansionAttributeName
        case .writingDirection: return NSWritingDirectionAttributeName
        case .verticalGlyphForm: return NSVerticalGlyphFormAttributeName
        case .markedClauseSegment: return NSMarkedClauseSegmentAttributeName
        case .textAlternatives: return NSTextAlternativesAttributeName
        case .spellingState: return NSSpellingStateAttributeName
        case .cursor: return NSCursorAttributeName
        case .toolTip: return NSToolTipAttributeName
        }
    }
    public var keyValuePair: [String: Any] {
        switch self {
        case .font(let value): return [self.key : value]
        case .paragraphStyle(let value): return [self.key : value]
        case .foregroundColor(let value): return [self.key : value]
        case .backgroundColor(let value): return [self.key : value]
        case .ligature(let value): return [self.key : value]
        case .kern(let value): return [self.key : value]
        case .strikethrough(let value): return [self.key : value]
        case .underline(let value): return [self.key : value]
        case .strokeColor(let value): return [self.key : value]
        case .strokeWidth(let value): return [self.key : value]
        case .shadow(let value): return [self.key : value]
        case .textEffect(let value): return [self.key : value]
        case .attachment(let value): return [self.key : value]
        case .link(let value): return [self.key : value]
        case .baselineOffset(let value): return [self.key : value]
        case .obliqueness(let value): return [self.key : value]
        case .expansion(let value): return [self.key : value]
        case .writingDirection(let value): return [self.key : value]
        case .verticalGlyphForm(let value): return [self.key : value]
        case .markedClauseSegment(let value): return [self.key : value]
        case .textAlternatives(let value): return [self.key : value]
        case .spellingState(let value): return [self.key : value]
        case .cursor(let value): return [self.key : value]
        case .toolTip(let value): return [self.key : value]
        }
    }
}

public struct TextAttributedDesigner {
    internal let attrText = NSMutableAttributedString()
    
    public var attributedString: NSAttributedString {
        return attrText
    }
    // Texkit Support
    public init(_ text: String,attrType: AttributeItemType? = nil ){
        self.append(text,attrType: attrType )
    }
    public func newline(attrType: AttributeItemType? = nil){
        self.append( "rn",attrType: attrType )
    }
    public func append(_ text: String,attrType: AttributeItemType? = nil ){
        let attr =  NSAttributedString(string: text,attributes: attrType?.keyValuePair )
        self.attrText.append( attr )
    }
    public func insert(_ text: String,at loc: Int,attributes: attrType?.keyValuePair )
        self.attrText.insert( attr,at: loc)
    }
    public func append(_ text: String,attrTypes: [AttributeItemType] ){
        let attr =  NSAttributedString(string: text,attributes: ItemTypesToDict(attrTypes: attrTypes) )
        self.attrText.append( attr )
    }
    public func insert(_ text: String,attributes: ItemTypesToDict(attrTypes: attrTypes) )
        self.attrText.insert( attr,at: loc)
    }
    
    //////////
    private func ItemTypesToDict(attrTypes: [AttributeItemType] )->[String: Any] {
        var dict = [String:Any]()
        for attr in attrTypes {
            let keyValue = attr.keyValuePair
            for (key,value) in keyValue {
                dict[key] = value
            }
        }
        return dict
    }

}