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//
// SSTextView.m
// SSToolkit
//
// Created by Sam Soffes on 8/18/10.
// Copyright 2010-2011 Sam Soffes. All rights reserved.
//
#import "SSTextView.h"
@interface SSTextView ()
- (void)_initialize;
- (void)_updateShouldDrawPlaceholder;
- (void)_textChanged:(NSNotification *)notification;
@end
@implementation SSTextView {
BOOL _shouldDrawPlaceholder;
}
#pragma mark - Accessors
@synthesize placeholder = _placeholder;
@synthesize placeholderColor = _placeholderColor;
- (void)setText:(NSString *)string {
[super setText:string];
[self _updateShouldDrawPlaceholder];
}
- (void)setPlaceholder:(NSString *)string {
if ([string isEqual:_placeholder]) {
return;
}
_placeholder = string;
[self _updateShouldDrawPlaceholder];
}
#pragma mark - NSObject
- (void)dealloc {
[[NSNotificationCenter defaultCenter] removeObserver:self name:UITextViewTextDidChangeNotification object:self];
}
#pragma mark - UIView
- (id)initWithCoder:(NSCoder *)aDecoder {
if ((self = [super initWithCoder:aDecoder])) {
[self _initialize];
}
return self;
}
- (id)initWithFrame:(CGRect)frame {
if ((self = [super initWithFrame:frame])) {
[self _initialize];
}
return self;
}
- (void)drawRect:(CGRect)rect {
[super drawRect:rect];
if (_shouldDrawPlaceholder) {
[_placeholderColor set];
[_placeholder drawInRect:CGRectMake(8.0f, 8.0f, self.frame.size.width - 16.0f, self.frame.size.height - 16.0f) withFont:self.font];
}
}
#pragma mark - Private
- (void)_initialize {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_textChanged:) name:UITextViewTextDidChangeNotification object:self];
self.placeholderColor = [UIColor colorWithWhite:0.702f alpha:1.0f];
_shouldDrawPlaceholder = NO;
}
- (void)_updateShouldDrawPlaceholder {
BOOL prev = _shouldDrawPlaceholder;
_shouldDrawPlaceholder = self.placeholder && self.placeholderColor && self.text.length == 0;
if (prev != _shouldDrawPlaceholder) {
[self setNeedsDisplay];
}
}
- (void)_textChanged:(NSNotification *)notificaiton {
[self _updateShouldDrawPlaceholder];
}
@end
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