/*
 * Copyright 2011 Sven Weidauer <sven.weidauer@gmail.com>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * NetSurf is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#import "cocoa/ScrollableView.h"

@interface ScrollableView ()

@property (weak, nonatomic) NSView *observedSuperview;

- (void)frameChangeNotification:(NSNotification *)note;

@end

@implementation ScrollableView

- (void)setMinimumSize:(NSSize)newSize
{
    if (!CGSizeEqualToSize(_minimumSize, newSize)) {
        _minimumSize = newSize;
        [self adjustFrame];
    }
}

- (void)adjustFrame
{
    NSSize frameSize = [[self superview] frame].size;
    [self setFrameSize:NSMakeSize(MAX(self.minimumSize.width, frameSize.width),
                           MAX(self.minimumSize.height, frameSize.height))];
}

- (void)frameChangeNotification:(NSNotification *)note
{
    // TODO: Correctly handle window resizing.
    // Removing this call is a quick hack to avoid an endless layout loop due to appearing/disappearing
    // scroll bars.
    //[self adjustFrame];
}

- (void)viewDidMoveToSuperview
{
    NSView *oldSuperview = _observedSuperview;
    _observedSuperview = nil;
    if (oldSuperview) {
        [[NSNotificationCenter defaultCenter]
            removeObserver:self
                      name:NSViewFrameDidChangeNotification
                    object:oldSuperview];
    }

    NSView *newSuperView = [self superview];

    if (nil != newSuperView) {
        _observedSuperview = newSuperView;
        [[NSNotificationCenter defaultCenter]
            addObserver:self
               selector:@selector(frameChangeNotification:)
                   name:NSViewFrameDidChangeNotification
                 object:newSuperView];
        newSuperView.postsFrameChangedNotifications = YES;
    }
}

@end