PageView.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 "PageView.h"
 
#define _Class _PageView
 
#pragma mark - View
 
static void addSubview(View *self, View *subview) {
 
    super(View, self, addSubview, subview);
 
    PageView *this = (PageView *) self;
 
    subview->hidden = true;
 
    if (this->currentPage == NULL) {
        $(this, setCurrentPage, subview);
    }
}
 
static View *init(View *self) {
    return (View *) $((PageView *) self, initWithFrame, NULL);
}
 
static void removeSubview(View *self, View *subview) {
 
    PageView *this = (PageView *) self;
 
    retain(subview);
 
    super(View, self, removeSubview, subview);
 
    subview->hidden = false;
 
    if (subview == this->currentPage) {
        $(this, setCurrentPage, NULL);
    }
 
    release(subview);
}
 
static Array *visibleSubviews(const View *self) {
    return $$(Array, arrayWithArray, (Array *) self->subviews);
}
 
#pragma mark - PageView
 
static PageView *initWithFrame(PageView *self, const SDL_Rect *frame) {
 
    self = (PageView *) super(View, self, initWithFrame, frame);
    if (self) {
        $((View *) self, addClassName, "container");
    }
 
    return self;
}
 
static void setCurrentPage_enumerate(const Array *array, ident obj, ident data) {
 
    View *subview = obj;
 
    if (subview == ((PageView *) data)->currentPage) {
        subview->hidden = false;
    } else {
        subview->hidden = true;
    }
}
 
static void setCurrentPage(PageView *self, View *currentPage) {
 
    if (currentPage != self->currentPage) {
 
        const Array *subviews = (Array *) self->view.subviews;
 
        if (currentPage) {
            self->currentPage = currentPage;
        } else {
            self->currentPage = $(subviews, firstObject);
        }
 
        $(subviews, enumerateObjects, setCurrentPage_enumerate, self);
 
        if (self->currentPage) {
 
            if (self->delegate.didSetCurrentPage) {
                self->delegate.didSetCurrentPage(self);
            }
        }
 
        self->view.needsLayout = true;
    }
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
    ((ViewInterface *) clazz->interface)->addSubview = addSubview;
    ((ViewInterface *) clazz->interface)->init = init;
    ((ViewInterface *) clazz->interface)->removeSubview = removeSubview;
    ((ViewInterface *) clazz->interface)->visibleSubviews = visibleSubviews;
 
    ((PageViewInterface *) clazz->interface)->initWithFrame = initWithFrame;
    ((PageViewInterface *) clazz->interface)->setCurrentPage = setCurrentPage;
}
 
Class *_PageView(void) {
    static Class *clazz;
    static Once once;
 
    do_once(&once, {
        clazz = _initialize(&(const ClassDef) {
            .name = "PageView",
            .superclass = _View(),
            .instanceSize = sizeof(PageView),
            .interfaceOffset = offsetof(PageView, interface),
            .interfaceSize = sizeof(PageViewInterface),
            .initialize = initialize,
        });
    });
 
    return clazz;
}
 
#undef _Class