WEPopoverController.m

//
//  WEPopoverController.m
//  WEPopover
//
//  Created by Werner Altewischer on 02/09/10.
//  Copyright 2010 Werner IT Consultancy. All rights reserved.
//

#import "WEPopoverController.h"
#import "WEPopoverParentView.h"
#import "UIBarButtonItem+WEPopover.h"

#define FADE_DURATION 0.3

@interface WEPopoverController(Private)

- (UIView *)keyView;
- (void)updateBackgroundPassthroughViews;
- (void)setView:(UIView *)v;
- (CGRect)displayAreaForView:(UIView *)theView;
- (WEPopoverContainerViewProperties *)defaultContainerViewProperties;
- (void)dismissPopoverAnimated:(BOOL)animated userInitiated:(BOOL)userInitiated;

@end


@implementation WEPopoverController

@synthesize contentViewController;
@synthesize popoverContentSize;
@synthesize popoverVisible;
@synthesize popoverArrowDirection;
@synthesize delegate;
@synthesize view;
@synthesize containerViewProperties;
@synthesize context;
@synthesize passthroughViews;

- (id)init {
	if ((self = [super init])) {
	}
	return self;
}

- (id)initWithContentViewController:(UIViewController *)viewController {
	if ((self = [self init])) {
		self.contentViewController = viewController;
	}
	return self;
}

- (void)dealloc {
	[self dismissPopoverAnimated:NO];
}

- (void)setContentViewController:(UIViewController *)vc {
	if (vc != contentViewController) {
		contentViewController = vc;
		popoverContentSize = CGSizeZero;
	}
}

//Overridden setter to copy the passthroughViews to the background view if it exists already
- (void)setPassthroughViews:(NSArray *)array {
	passthroughViews = nil;
	if (array) {
		passthroughViews = [[NSArray alloc] initWithArray:array];
	}
	[self updateBackgroundPassthroughViews];
}

- (void)dismissPopoverAnimated:(BOOL)animated {
	
	[self dismissPopoverAnimated:animated userInitiated:NO];
}

- (void)presentPopoverFromBarButtonItem:(UIBarButtonItem *)item 
			   permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections 
							   animated:(BOOL)animated {
	
	UIView *v = [self keyView];
	CGRect rect = [item frameInView:v];
	
    [self presentPopoverFromRect:rect inView:v permittedArrowDirections:arrowDirections animated:animated];
}

- (void)presentPopoverFromRect:(CGRect)rect 
						inView:(UIView *)theView 
	  permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections 
					  animated:(BOOL)animated {
	
	
	[self dismissPopoverAnimated:NO];
	
	//First force a load view for the contentViewController so the popoverContentSize is properly initialized
	// NEST: edit to avoid warning
	if (contentViewController.view == nil) return;
	
	if (CGSizeEqualToSize(popoverContentSize, CGSizeZero)) {
		popoverContentSize = contentViewController.preferredContentSize;
	}
	
	CGRect displayArea = [self displayAreaForView:theView];
	
	WEPopoverContainerViewProperties *props = self.containerViewProperties ? self.containerViewProperties : [self defaultContainerViewProperties];
	WEPopoverContainerView *containerView = [[WEPopoverContainerView alloc] initWithSize:self.popoverContentSize anchorRect:rect displayArea:displayArea permittedArrowDirections:arrowDirections properties:props];
	popoverArrowDirection = containerView.arrowDirection;
	
	UIView *topView = theView;
	while (topView.superview.superview != nil) topView = topView.superview;
	
	UIView *keyView = topView;
	
	backgroundView = [[WETouchableView alloc] initWithFrame:keyView.bounds];
	backgroundView.contentMode = UIViewContentModeScaleToFill;
	backgroundView.autoresizingMask = ( UIViewAutoresizingFlexibleLeftMargin |
									   UIViewAutoresizingFlexibleWidth |
									   UIViewAutoresizingFlexibleRightMargin |
									   UIViewAutoresizingFlexibleTopMargin |
									   UIViewAutoresizingFlexibleHeight |
									   UIViewAutoresizingFlexibleBottomMargin);
	backgroundView.backgroundColor = [UIColor clearColor];
	backgroundView.delegate = self;
	
	[keyView addSubview:backgroundView];
	
	containerView.frame = [theView convertRect:containerView.frame toView:backgroundView];
	
	[backgroundView addSubview:containerView];
	
	containerView.contentView = contentViewController.view;
	containerView.autoresizingMask = ( UIViewAutoresizingFlexibleLeftMargin |
									  UIViewAutoresizingFlexibleRightMargin);
	
	self.view = containerView;
	[self updateBackgroundPassthroughViews];
	
	[contentViewController viewWillAppear:animated];
	
	[self.view becomeFirstResponder];
	
	if (animated) {
		self.view.alpha = 0.0;

		[UIView animateWithDuration:FADE_DURATION animations:^{
			self.view.alpha = 1.0;
		} completion:^(BOOL finished) {
			self.view.userInteractionEnabled = YES;
			popoverVisible = YES;
			[contentViewController viewDidAppear:YES];
		}];
	} else {
		popoverVisible = YES;
		[contentViewController viewDidAppear:animated];
	}	
}

- (void)repositionPopoverFromRect:(CGRect)rect
						   inView:(UIView *)theView
		 permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections {
	
	CGRect displayArea = [self displayAreaForView:theView];
	WEPopoverContainerView *containerView = (WEPopoverContainerView *)self.view;
	[containerView updatePositionWithAnchorRect:rect
									displayArea:displayArea
					   permittedArrowDirections:arrowDirections];
	
	popoverArrowDirection = containerView.arrowDirection;
	containerView.frame = [theView convertRect:containerView.frame toView:backgroundView];
}

#pragma mark -
#pragma mark WETouchableViewDelegate implementation

- (void)viewWasTouched:(WETouchableView *)view {
	if (popoverVisible) {
		if (!delegate || [delegate popoverControllerShouldDismissPopover:self]) {
			[self dismissPopoverAnimated:YES userInitiated:YES];
		}
	}
}

@end


@implementation WEPopoverController(Private)

- (UIView *)keyView {
	UIWindow *w = [[UIApplication sharedApplication] keyWindow];
	if (w.subviews.count > 0) {
		return [w.subviews objectAtIndex:0];
	} else {
		return w;
	}
}

- (void)setView:(UIView *)v {
	if (view != v) {
		view = v;
	}
}

- (void)updateBackgroundPassthroughViews {
	backgroundView.passthroughViews = passthroughViews;
}


- (void)dismissPopoverAnimated:(BOOL)animated userInitiated:(BOOL)userInitiated {
	if (self.view) {
		[contentViewController viewWillDisappear:animated];
		popoverVisible = NO;
		[self.view resignFirstResponder];
		if (animated) {
			
			self.view.userInteractionEnabled = NO;
			[UIView animateWithDuration:FADE_DURATION animations:^{
				self.view.alpha = 0.0;
			} completion:^(BOOL finished) {
				popoverVisible = NO;
				[contentViewController viewDidDisappear:YES];
				[self.view removeFromSuperview];
				self.view = nil;
				[backgroundView removeFromSuperview];
				backgroundView = nil;
								
				if (userInitiated) {
					//Only send message to delegate in case the user initiated this event, which is if he touched outside the view
					[delegate popoverControllerDidDismissPopover:self];
				}
			}];
		} else {
			[contentViewController viewDidDisappear:animated];
			[self.view removeFromSuperview];
			self.view = nil;
			[backgroundView removeFromSuperview];
			backgroundView = nil;
		}
	}
}

- (CGRect)displayAreaForView:(UIView *)theView {
	CGRect displayArea = CGRectZero;
	if ([theView conformsToProtocol:@protocol(WEPopoverParentView)] && [theView respondsToSelector:@selector(displayAreaForPopover)]) {
		displayArea = [(id <WEPopoverParentView>)theView displayAreaForPopover];
	} else {
		displayArea = [[[UIApplication sharedApplication] keyWindow] convertRect:[[UIScreen mainScreen] applicationFrame] toView:theView];
		displayArea = CGRectInset(displayArea, 6, 6);	// give some margin from the edges of the screen
	}
	return displayArea;
}

//Enable to use the simple popover style
- (WEPopoverContainerViewProperties *)defaultContainerViewProperties {
	WEPopoverContainerViewProperties *ret = [WEPopoverContainerViewProperties new];
	
	CGSize imageSize = CGSizeMake(30.0f, 30.0f);
	NSString *bgImageName = nl_img_popover_bg_simple;
	CGFloat bgMargin = 0.0f;
	CGFloat contentMargin = 12.0f;
	
	ret.leftBgMargin = bgMargin;
	ret.rightBgMargin = bgMargin;
	ret.topBgMargin = bgMargin;
	ret.bottomBgMargin = bgMargin;
	ret.leftBgCapSize = (NSInteger)(imageSize.width/2);
	ret.topBgCapSize = (NSInteger)(imageSize.height/2);
	ret.bgImageName = bgImageName;
	ret.leftContentMargin = contentMargin;
	ret.rightContentMargin = contentMargin;
	ret.topContentMargin = contentMargin;
	ret.bottomContentMargin = contentMargin;
	ret.arrowMargin = 1.0f;
	
	ret.upArrowImageName = nl_img_popover_arrow_up_simple;
	ret.downArrowImageName = nl_img_popover_arrow_down_simple;
	ret.leftArrowImageName = nl_img_popover_arrow_left_simple;
	ret.rightArrowImageName = nl_img_popover_arrow_right_simple;
	return ret;
}

@end