NavigationViewController.c

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/*
 * ObjectivelyMVC: Object oriented MVC framework for OpenGL, SDL2 and GNU C.
 * Copyright (C) 2014 Jay Dolan <jay@jaydolan.com>
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */
 
#include <assert.h>
 
#include "NavigationViewController.h"
 
#define _Class _NavigationViewController
 
#pragma mark - Object
 
#pragma mark - NavigationViewController
 
static NavigationViewController *init(NavigationViewController *self) {
 
    return (NavigationViewController *) super(ViewController, self, init);
}
 
static void pushViewController(NavigationViewController *self, ViewController *viewController) {
 
    assert(viewController);
 
    ViewController *this = (ViewController *) self;
 
    ViewController *topViewController = $(self, topViewController);
    if (topViewController) {
 
        $(topViewController, viewWillDisappear);
        $(this->view, removeSubview, topViewController->view);
        $(topViewController, viewDidDisappear);
    }
 
    $(this, addChildViewController, viewController);
}
 
static void popToRootViewController(NavigationViewController *self) {
 
    const ViewController *rootViewController = $(self, rootViewController);
    if (rootViewController) {
        $(self, popToViewController, rootViewController);
    }
}
 
static void popToViewController(NavigationViewController *self, const ViewController *viewController) {
 
    ViewController *topViewController;
    while ((topViewController = $(self, topViewController))) {
 
        if (topViewController == viewController) {
            break;
        }
 
        $(self, popViewController);
    }
}
 
static void popViewController(NavigationViewController *self) {
 
    ViewController *topViewController = $(self, topViewController);
    if (topViewController) {
        $((ViewController *) self, removeChildViewController, topViewController);
    }
 
    ViewController *this = (ViewController *) self;
    ViewController *that = $(self, topViewController);
 
    if (that) {
        $(that, viewWillAppear);
        $(this->view, addSubview, that->view);
        $(that, viewDidAppear);
    }
}
 
static ViewController *rootViewController(const NavigationViewController *self) {
    return (ViewController *) $((Array *) self->viewController.childViewControllers, firstObject);
}
 
static ViewController *topViewController(const NavigationViewController *self) {
    return (ViewController *) $((Array *) self->viewController.childViewControllers, lastObject);
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
    ((NavigationViewControllerInterface *) clazz->interface)->init = init;
    ((NavigationViewControllerInterface *) clazz->interface)->pushViewController = pushViewController;
    ((NavigationViewControllerInterface *) clazz->interface)->popToRootViewController = popToRootViewController;
    ((NavigationViewControllerInterface *) clazz->interface)->popToViewController = popToViewController;
    ((NavigationViewControllerInterface *) clazz->interface)->popViewController = popViewController;
    ((NavigationViewControllerInterface *) clazz->interface)->rootViewController = rootViewController;
    ((NavigationViewControllerInterface *) clazz->interface)->topViewController = topViewController;
}
 
Class *_NavigationViewController(void) {
    static Class *clazz;
    static Once once;
 
    do_once(&once, {
        clazz = _initialize(&(const ClassDef) {
            .name = "NavigationViewController",
            .superclass = _ViewController(),
            .instanceSize = sizeof(NavigationViewController),
            .interfaceOffset = offsetof(NavigationViewController, interface),
            .interfaceSize = sizeof(NavigationViewControllerInterface),
            .initialize = initialize,
        });
    });
 
    return clazz;
}
 
#undef _Class