element-ios/Riot/Modules/Common/SectionHeaders/SectionHeaderView.m

/*
 Copyright 2014 OpenMarket Ltd
 Copyright 2020 Vector Creations Ltd
 
 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 "SectionHeaderView.h"

#import "GeneratedInterface-Swift.h"

static const CGFloat kInterItemsSpaceHorizontal = 8.0;

@implementation SectionHeaderView

+ (NSString*)defaultReuseIdentifier
{
    return NSStringFromClass([self class]);
}

- (void)setMinimumLeftInset:(CGFloat)minimumLeftInset
{
    _minimumLeftInset = minimumLeftInset;
    [self setNeedsLayout];
}

- (void)setMinimumRightInset:(CGFloat)minimumRightInset
{
    _minimumRightInset = minimumRightInset;
    [self setNeedsLayout];
}

- (void)setTopViewHeight:(CGFloat)topViewHeight
{
    _topViewHeight = topViewHeight;
    [self setNeedsLayout];
}

- (void)setTopPadding:(CGFloat)topPadding
{
    _topPadding = topPadding;
    [self setNeedsLayout];
}

- (void)setTopSpanningView:(UIView *)topSpanningView
{
    //  remove old one
    [_topSpanningView removeFromSuperview];
    _topSpanningView = topSpanningView;
    if (_topSpanningView)
    {
        //  add new one
        [self.contentView addSubview:_topSpanningView];
    }
    [self setNeedsLayout];
}

- (void)setHeaderLabel:(UILabel *)headerLabel
{
    //  remove old one
    [_headerLabel removeFromSuperview];
    _headerLabel = headerLabel;
    if (_headerLabel)
    {
        //  add new one
        [self.contentView addSubview:_headerLabel];
    }
    [self setNeedsLayout];
}

- (void)setAccessoryView:(UIView *)accessoryView
{
    //  remove old one
    [_accessoryView removeFromSuperview];
    _accessoryView = accessoryView;
    if (_accessoryView)
    {
        //  add new one
        [self.contentView addSubview:_accessoryView];
    }
    [self setNeedsLayout];
}

- (void)setRightAccessoryView:(UIView *)rightAccessoryView
{
    //  remove old one
    [_rightAccessoryView removeFromSuperview];
    _rightAccessoryView = rightAccessoryView;
    if (_rightAccessoryView)
    {
        //  add new one
        [self.contentView addSubview:_rightAccessoryView];
    }
    [self setNeedsLayout];
}

- (void)setBottomView:(UIView *)bottomView
{
    //  remove old one
    [_bottomView removeFromSuperview];
    _bottomView = bottomView;
    if (_bottomView)
    {
        //  add new one
        [self.contentView addSubview:_bottomView];
    }
    [self setNeedsLayout];
}

- (instancetype)init
{
    return [self initWithFrame:CGRectZero];
}

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self)
    {
        [self setup];
    }
    return self;
}

- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
    if (self)
    {
        [self setup];
    }
    return self;
}

- (instancetype)initWithReuseIdentifier:(NSString *)reuseIdentifier
{
    if (self = [super initWithReuseIdentifier:reuseIdentifier])
    {
        [self setup];
    }
    return self;
}

- (void)setup
{
    _minimumLeftInset = 16;
    _minimumRightInset = 16;
    _topViewHeight = 30;
}

- (void)prepareForReuse
{
    [self.contentView vc_removeAllSubviews];
    [super prepareForReuse];
}

- (void)layoutSubviews
{
    [super layoutSubviews];

    CGFloat _leftInset = 0.0, _rightInset = 0.0;

    CGFloat leftMargin = _minimumLeftInset;
    CGFloat rightMargin = _minimumRightInset;

    if (_topSpanningView)
    {
        CGRect frame = self.contentView.bounds;
        frame.origin.y += _topPadding;
        frame.size.height = _topViewHeight;
        _topSpanningView.frame = frame;
    }

    if (_headerLabel)
    {
        CGRect frame = _headerLabel.frame;
        frame.origin.x = leftMargin;
        if (_accessoryView)
        {
            rightMargin += _accessoryView.frame.size.width + kInterItemsSpaceHorizontal;
        }
        if (_rightAccessoryView)
        {
            rightMargin += _rightAccessoryView.frame.size.width + kInterItemsSpaceHorizontal;
        }
        if (_bottomView)
        {
            //  set header label top
            frame.origin.y = (_topViewHeight - frame.size.height)/2;
        }
        else
        {
            //  center header label vertically
            frame.origin.y = MAX(0, (self.contentView.bounds.size.height - frame.size.height)/2);
        }
        frame.size.width = MIN(self.contentView.bounds.size.width - leftMargin - rightMargin,
                               [_headerLabel sizeThatFits:self.frame.size].width);
        frame.origin.y += _topPadding;
        _headerLabel.frame = frame;
    }

    if (_accessoryView)
    {
        //  reset margins
        leftMargin = MAX(_leftInset, 20);
        rightMargin = MAX(_rightInset, 20);

        CGRect frame = _accessoryView.frame;
        if(_headerLabel)
        {
            frame.origin.x = leftMargin + _headerLabel.frame.size.width + kInterItemsSpaceHorizontal;
        }
        else
        {
            frame.origin.x = leftMargin;
        }
        frame.origin.y = MAX(0, (_topViewHeight - frame.size.height)/2);
        frame.origin.y += _topPadding;
        _accessoryView.frame = frame;
    }

    if (_rightAccessoryView)
    {
        //  reset margins
        leftMargin = MAX(_leftInset, 20);
        rightMargin = MAX(_rightInset, 20);

        CGRect frame = _rightAccessoryView.frame;
        frame.origin.x = self.contentView.bounds.size.width - frame.size.width - rightMargin;
        frame.origin.y = MAX(0, (_topViewHeight - frame.size.height)/2);
        frame.origin.y += _topPadding;
        _rightAccessoryView.frame = frame;
    }

    if (_bottomView)
    {
        //  reset margins
        leftMargin = MAX(_leftInset, 16);
        rightMargin = MAX(_rightInset, 16);

        CGRect frame = _bottomView.frame;
        frame.origin.x = leftMargin;
        frame.origin.y = CGRectGetMaxY(_headerLabel.frame);
        frame.size.width = self.contentView.bounds.size.width - leftMargin - rightMargin;
        frame.size.height = self.contentView.bounds.size.height - frame.origin.y;
        _bottomView.frame = frame;
    }
}

@end