//

// QMUIEmptyView.m

// qmui

//

// Created by 李凯 on 2016/10/9.

// Copyright © 2016年 QMUI Team. All rights reserved.

//

#import "QMUIEmptyView.h"

#import "QMUICore.h"

#import "UIControl+QMUI.h"

#import "NSParagraphStyle+QMUI.h"

@interface QMUIEmptyView ()

@property(nonatomic, strong) UIScrollView *scrollView; // 保证内容超出屏幕时也不至于直接被clip（比如横屏时）

@end

@implementation QMUIEmptyView

- (instancetype)initWithFrame:(CGRect)frame {

self = [super initWithFrame:frame];

if (self) {

[self didInitialized];

}

return self;

}

- (instancetype)initWithCoder:(NSCoder *)aDecoder {

if (self = [super initWithCoder:aDecoder]) {

[self didInitialized];

}

return self;

}

- (void)didInitialized {

// 系统默认会在view即将被add到window上时才设置这些值，这个时机有点晚了，因为我们可能在add到window之前就进行sizeThatFits计算或对view进行截图等操作，因此这里提前到init时就去做

QMUIEmptyView *appearance = [QMUIEmptyView appearance];

_imageViewInsets = appearance.imageViewInsets;

_loadingViewInsets = appearance.loadingViewInsets;

_textLabelInsets = appearance.textLabelInsets;

_detailTextLabelInsets = appearance.detailTextLabelInsets;

_actionButtonInsets = appearance.actionButtonInsets;

_verticalOffset = appearance.verticalOffset;

_textLabelFont = appearance.textLabelFont;

_detailTextLabelFont = appearance.detailTextLabelFont;

_actionButtonFont = appearance.actionButtonFont;

_textLabelTextColor = appearance.textLabelTextColor;

_detailTextLabelTextColor = appearance.detailTextLabelTextColor;

_actionButtonTitleColor = appearance.actionButtonTitleColor;

self.scrollView = [[UIScrollView alloc] init];

self.scrollView.showsVerticalScrollIndicator = NO;

self.scrollView.showsHorizontalScrollIndicator = NO;

self.scrollView.scrollsToTop = NO;

self.scrollView.contentInset = UIEdgeInsetsMake(0, 10, 0, 10); // 避免 label 直接撑满到屏幕两边，不好看

[self addSubview:self.scrollView];

_contentView = [[UIView alloc] init];

[self.scrollView addSubview:self.contentView];

_loadingView = (UIView<QMUIEmptyViewLoadingViewProtocol> *)[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];

((UIActivityIndicatorView *)self.loadingView).hidesWhenStopped = NO; // 此控件是通过loadingView.hidden属性来控制显隐的，如果UIActivityIndicatorView的hidesWhenStopped属性设置为YES的话，则手动设置它的hidden属性就会失效，因此这里要置为NO

[self.contentView addSubview:self.loadingView];

_imageView = [[UIImageView alloc] init];

self.imageView.contentMode = UIViewContentModeCenter;

[self.contentView addSubview:self.imageView];

_textLabel = [[UILabel alloc] init];

self.textLabel.textAlignment = NSTextAlignmentCenter;

self.textLabel.numberOfLines = 0;

[self.contentView addSubview:self.textLabel];

_detailTextLabel = [[UILabel alloc] init];

self.detailTextLabel.textAlignment = NSTextAlignmentCenter;

self.detailTextLabel.numberOfLines = 0;

[self.contentView addSubview:self.detailTextLabel];

_actionButton = [[UIButton alloc] init];

self.actionButton.qmui_outsideEdge = UIEdgeInsetsMake(-20, -20, -20, -20);

[self.contentView addSubview:self.actionButton];

}

- (void)layoutSubviews {

[super layoutSubviews];

self.scrollView.frame = self.bounds;

CGSize contentViewSize = CGSizeFlatted([self sizeThatContentViewFits]);

self.contentView.frame = CGRectFlatMake(0, CGRectGetMidY(self.scrollView.bounds) - contentViewSize.height / 2 + self.verticalOffset, contentViewSize.width, contentViewSize.height);

self.scrollView.contentSize = CGSizeMake(fmaxf(CGRectGetWidth(self.scrollView.bounds) - UIEdgeInsetsGetHorizontalValue(self.scrollView.contentInset), contentViewSize.width), fmaxf(CGRectGetHeight(self.scrollView.bounds) - UIEdgeInsetsGetVerticalValue(self.scrollView.contentInset), CGRectGetMaxY(self.contentView.frame)));

CGFloat originY = 0;

if (!self.imageView.hidden) {

[self.imageView sizeToFit];

self.imageView.frame = CGRectSetXY(self.imageView.frame, CGRectGetMinXHorizontallyCenterInParentRect(self.contentView.bounds, self.imageView.frame) + self.imageViewInsets.left - self.imageViewInsets.right, originY + self.imageViewInsets.top);

originY = CGRectGetMaxY(self.imageView.frame) + self.imageViewInsets.bottom;

}

if (!self.loadingView.hidden) {

self.loadingView.frame = CGRectSetXY(self.loadingView.frame, CGRectGetMinXHorizontallyCenterInParentRect(self.contentView.bounds, self.loadingView.frame) + self.loadingViewInsets.left - self.loadingViewInsets.right, originY + self.loadingViewInsets.top);

originY = CGRectGetMaxY(self.loadingView.frame) + self.loadingViewInsets.bottom;

}

if (!self.textLabel.hidden) {

CGFloat labelWidth = CGRectGetWidth(self.contentView.bounds) - UIEdgeInsetsGetHorizontalValue(self.textLabelInsets);

CGSize labelSize = [self.textLabel sizeThatFits:CGSizeMake(labelWidth, CGFLOAT_MAX)];

self.textLabel.frame = CGRectFlatMake(self.textLabelInsets.left, originY + self.textLabelInsets.top, labelWidth, labelSize.height);

originY = CGRectGetMaxY(self.textLabel.frame) + self.textLabelInsets.bottom;

}

if (!self.detailTextLabel.hidden) {

CGFloat labelWidth = CGRectGetWidth(self.contentView.bounds) - UIEdgeInsetsGetHorizontalValue(self.detailTextLabelInsets);

CGSize labelSize = [self.detailTextLabel sizeThatFits:CGSizeMake(labelWidth, CGFLOAT_MAX)];

self.detailTextLabel.frame = CGRectFlatMake(self.detailTextLabelInsets.left, originY + self.detailTextLabelInsets.top, labelWidth, labelSize.height);

originY = CGRectGetMaxY(self.detailTextLabel.frame) + self.detailTextLabelInsets.bottom;

}

if (!self.actionButton.hidden) {

[self.actionButton sizeToFit];

self.actionButton.frame = CGRectSetXY(self.actionButton.frame, CGRectGetMinXHorizontallyCenterInParentRect(self.contentView.bounds, self.actionButton.frame) + self.actionButtonInsets.left - self.actionButtonInsets.right, originY + self.actionButtonInsets.top);

originY = CGRectGetMaxY(self.actionButton.frame) + self.actionButtonInsets.bottom;

}

}

- (CGSize)sizeThatContentViewFits {

CGFloat resultWidth = CGRectGetWidth(self.scrollView.bounds) - UIEdgeInsetsGetHorizontalValue(self.scrollView.contentInset);

CGFloat imageViewHeight = [self.imageView sizeThatFits:CGSizeMake(resultWidth, CGFLOAT_MAX)].height + UIEdgeInsetsGetVerticalValue(self.imageViewInsets);

CGFloat loadingViewHeight = CGRectGetHeight(self.loadingView.bounds) + UIEdgeInsetsGetVerticalValue(self.loadingViewInsets);

CGFloat textLabelHeight = [self.textLabel sizeThatFits:CGSizeMake(resultWidth, CGFLOAT_MAX)].height + UIEdgeInsetsGetVerticalValue(self.textLabelInsets);

CGFloat detailTextLabelHeight = [self.detailTextLabel sizeThatFits:CGSizeMake(resultWidth, CGFLOAT_MAX)].height + UIEdgeInsetsGetVerticalValue(self.detailTextLabelInsets);

CGFloat actionButtonHeight = [self.actionButton sizeThatFits:CGSizeMake(resultWidth, CGFLOAT_MAX)].height + UIEdgeInsetsGetVerticalValue(self.actionButtonInsets);

CGFloat resultHeight = 0;

if (!self.imageView.hidden) {

resultHeight += imageViewHeight;

}

if (!self.loadingView.hidden) {

resultHeight += loadingViewHeight;

}

if (!self.textLabel.hidden) {

resultHeight += textLabelHeight;

}

if (!self.detailTextLabel.hidden) {

resultHeight += detailTextLabelHeight;

}

if (!self.actionButton.hidden) {

resultHeight += actionButtonHeight;

}

return CGSizeMake(resultWidth, resultHeight);

}

- (void)updateDetailTextLabelWithText:(NSString *)text {

if (self.detailTextLabelFont && self.detailTextLabelTextColor && text) {

NSAttributedString *string = [[NSAttributedString alloc] initWithString:text attributes:@{

NSFontAttributeName: self.detailTextLabelFont,

NSForegroundColorAttributeName: self.detailTextLabelTextColor,

NSParagraphStyleAttributeName: [NSMutableParagraphStyle qmui_paragraphStyleWithLineHeight:self.detailTextLabelFont.pointSize + 10 lineBreakMode:NSLineBreakByWordWrapping textAlignment:NSTextAlignmentCenter]

}];

self.detailTextLabel.attributedText = string;

}

self.detailTextLabel.hidden = !text;

[self setNeedsLayout];

}

- (void)setLoadingView:(UIView<QMUIEmptyViewLoadingViewProtocol> *)loadingView {

if (self.loadingView != loadingView) {

[self.loadingView removeFromSuperview];

_loadingView = loadingView;

[self.contentView addSubview:loadingView];

}

[self setNeedsLayout];

}

- (void)setLoadingViewHidden:(BOOL)hidden {

self.loadingView.hidden = hidden;

if (!hidden && [self.loadingView respondsToSelector:@selector(startAnimating)]) {

[self.loadingView startAnimating];

}

[self setNeedsLayout];

}

- (void)setImage:(UIImage *)image {

self.imageView.image = image;

self.imageView.hidden = !image;

[self setNeedsLayout];

}

- (void)setTextLabelText:(NSString *)text {

self.textLabel.text = text;

self.textLabel.hidden = !text;

[self setNeedsLayout];

}

- (void)setDetailTextLabelText:(NSString *)text {

[self updateDetailTextLabelWithText:text];

}

- (void)setActionButtonTitle:(NSString *)title {

[self.actionButton setTitle:title forState:UIControlStateNormal];

self.actionButton.hidden = !title;

[self setNeedsLayout];

}

- (void)setImageViewInsets:(UIEdgeInsets)imageViewInsets {

_imageViewInsets = imageViewInsets;

[self setNeedsLayout];

}

- (void)setTextLabelInsets:(UIEdgeInsets)textLabelInsets {

_textLabelInsets = textLabelInsets;

[self setNeedsLayout];

}

- (void)setDetailTextLabelInsets:(UIEdgeInsets)detailTextLabelInsets {

_detailTextLabelInsets = detailTextLabelInsets;

[self setNeedsLayout];

}

- (void)setActionButtonInsets:(UIEdgeInsets)actionButtonInsets {

_actionButtonInsets = actionButtonInsets;

[self setNeedsLayout];

}

- (void)setVerticalOffset:(CGFloat)verticalOffset {

_verticalOffset = verticalOffset;

[self setNeedsLayout];

}

- (void)setTextLabelFont:(UIFont *)textLabelFont {

_textLabelFont = textLabelFont;

self.textLabel.font = textLabelFont;

[self setNeedsLayout];

}

- (void)setDetailTextLabelFont:(UIFont *)detailTextLabelFont {

_detailTextLabelFont = detailTextLabelFont;

[self updateDetailTextLabelWithText:self.detailTextLabel.text];

}

- (void)setActionButtonFont:(UIFont *)actionButtonFont {

_actionButtonFont = actionButtonFont;

self.actionButton.titleLabel.font = actionButtonFont;

[self setNeedsLayout];

}

- (void)setTextLabelTextColor:(UIColor *)textLabelTextColor {

_textLabelTextColor = textLabelTextColor;

self.textLabel.textColor = textLabelTextColor;

}

- (void)setDetailTextLabelTextColor:(UIColor *)detailTextLabelTextColor {

_detailTextLabelTextColor = detailTextLabelTextColor;

[self updateDetailTextLabelWithText:self.detailTextLabel.text];

}

- (void)setActionButtonTitleColor:(UIColor *)actionButtonTitleColor {

_actionButtonTitleColor = actionButtonTitleColor;

[self.actionButton setTitleColor:actionButtonTitleColor forState:UIControlStateNormal];

}

@end

@interface QMUIEmptyView (UIAppearance)

@end

@implementation QMUIEmptyView (UIAppearance)

+ (void)initialize {

static dispatch_once_t onceToken;

dispatch_once(&onceToken, ^{

[self setDefaultAppearance];

});

}

+ (void)setDefaultAppearance {

QMUIEmptyView *appearance = [QMUIEmptyView appearance];

appearance.imageViewInsets = UIEdgeInsetsMake(0, 0, 36, 0);

appearance.loadingViewInsets = UIEdgeInsetsMake(0, 0, 36, 0);

appearance.textLabelInsets = UIEdgeInsetsMake(0, 0, 10, 0);

appearance.detailTextLabelInsets = UIEdgeInsetsMake(0, 0, 10, 0);

appearance.actionButtonInsets = UIEdgeInsetsZero;

appearance.verticalOffset = -30;

appearance.textLabelFont = UIFontMake(15);

appearance.detailTextLabelFont = UIFontMake(14);

appearance.actionButtonFont = UIFontMake(15);

appearance.textLabelTextColor = UIColorMake(93, 100, 110);

appearance.detailTextLabelTextColor = UIColorMake(133, 140, 150);

appearance.actionButtonTitleColor = ButtonTintColor;

}

@end