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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "chrome/browser/cocoa/vertical_layout_view.h"
@interface VerticalLayoutView(PrivateMethods)
- (void)layoutChildren;
@end
@implementation VerticalLayoutView
- (id)initWithFrame:(NSRect)frame {
self = [super initWithFrame:frame];
if (self) {
// Turn auto resizing off, we'll be laying out our children programatically.
[self setAutoresizesSubviews:NO];
[self setAutoresizingMask:NSViewNotSizable];
}
return self;
}
// Flip the coordinate system to arrange child views from top to bottom
// with top at 0, increasing down. This simplifies the logic and plays
// well with containing scroll views.
- (BOOL)isFlipped {
return YES;
}
// Override the default |viewWillDraw| to indicate to drawing machinery proper
// arrangement of subviews.
- (void)viewWillDraw {
// Reposition child views prior to super's descent into its |viewWillDraw|
// pass.
[self layoutChildren];
// Default descent into subviews.
[super viewWillDraw];
// Adjust children again to account for any modifications made during the
// prior descent. Most importantly we resize our own frame to properly
// adjust any containing scroll view.
[self layoutChildren];
}
@end
@implementation VerticalLayoutView(PrivateMethods)
// This method traverses the immediate subviews measuring their height and
// adjusting their frames so they are arranged vertically ordered relative
// to their sibling views. Note the dependency here on the |isFlipped|
// state. This code assumes |isFlipped| is YES.
- (void)layoutChildren {
NSArray* children = [self subviews];
int childCount = [children count];
CGFloat yPosition = 0.0;
for (int i = childCount-1; i >= 0; --i) {
NSView* child = [children objectAtIndex:i];
[child setFrameOrigin:NSMakePoint([child frame].origin.x, yPosition)];
yPosition += [child frame].size.height;
}
// Resize self to reflect vertical extent of children.
[self setFrame:NSMakeRect([self frame].origin.x,
[self frame].origin.y,
[self frame].size.width,
yPosition)];
}
@end
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