FLEX/Classes/Editing/ArgumentInputViews/FLEXArgumentInputTextView.m

//
//  FLEXArgumentInputTextView.m
//  FLEXInjected
//
//  Created by Ryan Olson on 6/15/14.
//
//

#import "FLEXColor.h"
#import "FLEXArgumentInputTextView.h"
#import "FLEXUtility.h"

@interface FLEXArgumentInputTextView ()

@property (nonatomic) UITextView *inputTextView;
@property (nonatomic) UILabel *placeholderLabel;
@property (nonatomic, readonly) NSUInteger numberOfInputLines;

@end

@implementation FLEXArgumentInputTextView

- (instancetype)initWithArgumentTypeEncoding:(const char *)typeEncoding
{
    self = [super initWithArgumentTypeEncoding:typeEncoding];
    if (self) {
        self.inputTextView = [UITextView new];
        self.inputTextView.font = [[self class] inputFont];
        self.inputTextView.backgroundColor = [FLEXColor primaryBackgroundColor];
        self.inputTextView.layer.borderColor = [FLEXColor borderColor].CGColor;
        self.inputTextView.layer.borderWidth = 1.f;
        self.inputTextView.layer.cornerRadius = 5.f;
        self.inputTextView.autocapitalizationType = UITextAutocapitalizationTypeNone;
        self.inputTextView.autocorrectionType = UITextAutocorrectionTypeNo;
        self.inputTextView.delegate = self;
        self.inputTextView.inputAccessoryView = [self createToolBar];
        [self addSubview:self.inputTextView];

        self.placeholderLabel = [UILabel new];
        self.placeholderLabel.font = self.inputTextView.font;
        self.placeholderLabel.textColor = [FLEXColor deemphasizedTextColor];
        self.placeholderLabel.numberOfLines = 0;
        [self.inputTextView addSubview:self.placeholderLabel];

    }
    return self;
}

#pragma mark - Private

- (UIToolbar *)createToolBar
{
    UIToolbar *toolBar = [UIToolbar new];
    [toolBar sizeToFit];
    UIBarButtonItem *spaceItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
    UIBarButtonItem *doneItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(textViewDone)];
    toolBar.items = @[spaceItem, doneItem];
    return toolBar;
}

- (void)textViewDone
{
    [self.inputTextView resignFirstResponder];
}

- (void)setInputPlaceholderText:(NSString *)placeholder
{
    self.placeholderLabel.text = placeholder;
    if (placeholder.length) {
        if (!self.inputTextView.text.length) {
            self.placeholderLabel.hidden = NO;
        } else {
            self.placeholderLabel.hidden = YES;
        }
    } else {
        self.placeholderLabel.hidden = YES;
    }

    [self setNeedsLayout];
}

- (NSString *)inputPlaceholderText
{
    return self.placeholderLabel.text;
}


#pragma mark - Superclass Overrides

- (BOOL)inputViewIsFirstResponder
{
    return self.inputTextView.isFirstResponder;
}


#pragma mark - Layout and Sizing

- (void)layoutSubviews
{
    [super layoutSubviews];
    
    self.inputTextView.frame = CGRectMake(0, self.topInputFieldVerticalLayoutGuide, self.bounds.size.width, [self inputTextViewHeight]);
    // Placeholder label is positioned by insetting origin,
    // which is the line fragment padding for X and 0 for Y,
    // by the content inset then the text container inset
    CGFloat leading = self.inputTextView.textContainer.lineFragmentPadding;
    CGSize s = self.inputTextView.frame.size;
    self.placeholderLabel.frame = CGRectMake(leading, 0, s.width, s.height);
    self.placeholderLabel.frame = UIEdgeInsetsInsetRect(
        UIEdgeInsetsInsetRect(self.placeholderLabel.frame, self.inputTextView.contentInset),
        self.inputTextView.textContainerInset
    );
}

- (NSUInteger)numberOfInputLines
{
    switch (self.targetSize) {
        case FLEXArgumentInputViewSizeDefault:
            return 2;
        case FLEXArgumentInputViewSizeSmall:
            return 1;
        case FLEXArgumentInputViewSizeLarge:
            return 8;
    }
}

- (CGFloat)inputTextViewHeight
{
    return ceil([[self class] inputFont].lineHeight * self.numberOfInputLines) + 16.0;
}

- (CGSize)sizeThatFits:(CGSize)size
{
    CGSize fitSize = [super sizeThatFits:size];
    fitSize.height += [self inputTextViewHeight];
    return fitSize;
}


#pragma mark - Trait collection changes

- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection
{
#if FLEX_AT_LEAST_IOS13_SDK
    if (@available(iOS 13.0, *)) {
        if (previousTraitCollection.userInterfaceStyle != self.traitCollection.userInterfaceStyle) {
            self.inputTextView.layer.borderColor = [FLEXColor borderColor].CGColor;
        }
    }
#endif
}


#pragma mark - Class Helpers

+ (UIFont *)inputFont
{
    return [FLEXUtility defaultFontOfSize:14.0];
}


#pragma mark - UITextViewDelegate

- (void)textViewDidChange:(UITextView *)textView
{
    [self.delegate argumentInputViewValueDidChange:self];
    self.placeholderLabel.hidden = !(self.inputPlaceholderText.length && !textView.text.length);
}

@end