Justin Spahr-Summers
98 lines
3.0 KiB
Objective-C
98 lines
3.0 KiB
Objective-C
/*
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Copyright 2011 Twitter, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this work except in compliance with the License.
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You may obtain a copy of the License in the LICENSE file, or at:
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#import "ExampleTabBar.h"
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@interface ExampleTab : TUIView
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@end
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@implementation ExampleTab
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- (ExampleTabBar *)tabBar
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{
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return (ExampleTabBar *)self.superview;
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}
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- (void)mouseDown:(NSEvent *)event
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{
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[super mouseDown:event]; // always call super when overriding mouseXXX: methods - lots of plumbing happens in TUIView
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[self setNeedsDisplay];
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}
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- (void)mouseUp:(NSEvent *)event
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{
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[super mouseUp:event];
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// rather than a simple -setNeedsDisplay, let's fade it back out
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[TUIView animateWithDuration:0.5 animations:^{
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[self redraw]; // -redraw forces a .contents update immediately based on drawRect, and it happens inside an animation block, so CoreAnimation gives us a cross-fade for free
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}];
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if([self eventInside:event]) { // only perform the action if the mouse up happened inside our bounds - ignores mouse down, drag-out, mouse up
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[[self tabBar].delegate tabBar:[self tabBar] didSelectTab:self.tag];
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}
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}
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@end
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@implementation ExampleTabBar
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@synthesize delegate;
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@synthesize tabViews;
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- (id)initWithNumberOfTabs:(NSInteger)nTabs
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{
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if((self = [super initWithFrame:CGRectZero])) {
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NSMutableArray *_tabViews = [NSMutableArray arrayWithCapacity:nTabs];
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for(int i = 0; i < nTabs; ++i) {
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ExampleTab *t = [[ExampleTab alloc] initWithFrame:CGRectZero];
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t.tag = i;
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t.layout = ^(TUIView *v) { // the layout of an individual tab is a function of the superview bounds, the number of tabs, and the current tab index
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CGRect b = v.superview.bounds; // reference the passed-in 'v' rather than 't' to avoid a retain cycle
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float width = b.size.width / nTabs;
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float x = i * width;
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return CGRectMake(roundf(x), 0, roundf(width), b.size.height);
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};
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[self addSubview:t];
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[_tabViews addObject:t];
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}
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tabViews = [[NSArray alloc] initWithArray:_tabViews];
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}
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return self;
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}
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- (void)drawRect:(CGRect)rect
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{
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// draw tab bar background
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CGRect b = self.bounds;
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CGContextRef ctx = TUIGraphicsGetCurrentContext();
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// gray gradient
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CGFloat colorA[] = { 0.85, 0.85, 0.85, 1.0 };
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CGFloat colorB[] = { 0.71, 0.71, 0.71, 1.0 };
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CGContextDrawLinearGradientBetweenPoints(ctx, CGPointMake(0, b.size.height), colorA, CGPointMake(0, 0), colorB);
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// top emboss
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CGContextSetRGBFillColor(ctx, 1, 1, 1, 0.5);
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CGContextFillRect(ctx, CGRectMake(0, b.size.height-2, b.size.width, 1));
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CGContextSetRGBFillColor(ctx, 0, 0, 0, 0.3);
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CGContextFillRect(ctx, CGRectMake(0, b.size.height-1, b.size.width, 1));
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}
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@end
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