StackView.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 "StackView.h"
 
const EnumName StackViewAxisNames[] = MakeEnumNames(
    MakeEnumAlias(StackViewAxisVertical, vertical),
    MakeEnumAlias(StackViewAxisHorizontal, horizontal)
);
 
const EnumName StackViewDistributionNames[] = MakeEnumNames(
    MakeEnumAlias(StackViewDistributionDefault, default),
    MakeEnumAlias(StackViewDistributionFill, fill),
    MakeEnumAlias(StackViewDistributionFillEqually, fill-equally)
);
 
#define _Class _StackView
 
#pragma mark - View
 
static void applyStyle(View *self, const Style *style) {
 
    super(View, self, applyStyle, style);
 
    StackView *this = (StackView *) self;
 
    const Inlet inlets[] = MakeInlets(
        MakeInlet("axis", InletTypeEnum, &this->axis, (ident) StackViewAxisNames),
        MakeInlet("distribution", InletTypeEnum, &this->distribution, (ident) StackViewDistributionNames),
        MakeInlet("spacing", InletTypeInteger, &this->spacing, NULL)
    );
 
    $(self, bind, inlets, (Dictionary *) style->attributes);
}
 
static View *init(View *self) {
    return (View *) $((StackView *) self, initWithFrame, NULL);
}
 
static void layoutSubviews(View *self) {
 
    super(View, self, layoutSubviews);
 
    Array *subviews = $(self, visibleSubviews);
    if (subviews->count) {
 
        StackView *this = (StackView *) self;
 
        const SDL_Rect bounds = $(self, bounds);
 
        int availableSize, requestedSize = 0;
        switch (this->axis) {
            case StackViewAxisVertical:
                availableSize = bounds.h;
                break;
            case StackViewAxisHorizontal:
                availableSize = bounds.w;
                break;
        }
 
        availableSize -= this->spacing * (subviews->count - 1);
 
        for (size_t i = 0; i < subviews->count; i++) {
 
            const View *subview = $(subviews, objectAtIndex, i);
            const SDL_Size size = $(subview, size);
 
            switch (this->axis) {
                case StackViewAxisVertical:
                    requestedSize += size.h;
                    break;
                case StackViewAxisHorizontal:
                    requestedSize += size.w;
                    break;
            }
        }
 
        int pos = 0;
 
        const float scale = requestedSize ? availableSize / (float) requestedSize : 1.0;
 
        for (size_t i = 0; i < subviews->count; i++) {
 
            View *subview = $(subviews, objectAtIndex, i);
 
            switch (this->axis) {
                case StackViewAxisVertical:
                    subview->frame.y = pos;
                    break;
                case StackViewAxisHorizontal:
                    subview->frame.x = pos;
                    break;
            }
 
            SDL_Size subviewSize = $(subview, size);
 
            switch (this->distribution) {
                case StackViewDistributionDefault:
                    break;
 
                case StackViewDistributionFill:
                    switch (this->axis) {
                        case StackViewAxisVertical:
                            subviewSize.h *= scale;
                            break;
                        case StackViewAxisHorizontal:
                            subviewSize.w *= scale;
                            break;
                    }
                    break;
 
                case StackViewDistributionFillEqually:
                    switch (this->axis) {
                        case StackViewAxisVertical:
                            subviewSize.h = availableSize / (float) subviews->count;
                            break;
                        case StackViewAxisHorizontal:
                            subviewSize.w = availableSize / (float) subviews->count;
                            break;
                    }
                    break;
            }
 
            $(subview, resize, &subviewSize);
 
            switch (this->axis) {
                case StackViewAxisVertical:
                    pos += subviewSize.h;
                    break;
                case StackViewAxisHorizontal:
                    pos += subviewSize.w;
                    break;
            }
 
            pos += this->spacing;
        }
    }
 
    release(subviews);
}
 
static SDL_Size sizeThatFits(const View *self) {
 
    SDL_Size size = super(View, self, sizeThatFits);
 
    if ($(self, isContainer)) {
 
        const StackView *this = (StackView *) self;
 
        switch (this->axis) {
            case StackViewAxisVertical:
                size.h = self->padding.top + self->padding.bottom;
                break;
            case StackViewAxisHorizontal:
                size.w = self->padding.left + self->padding.right;
                break;
        }
 
        Array *subviews = $(self, visibleSubviews);
        for (size_t i = 0; i < subviews->count; i++) {
 
            const View *subview = $(subviews, objectAtIndex, i);
            const SDL_Size subviewSize = $(subview, sizeThatContains);
 
            switch (this->axis) {
                case StackViewAxisVertical:
                    size.h += subviewSize.h;
                    break;
                case StackViewAxisHorizontal:
                    size.w += subviewSize.w;
                    break;
            }
        }
 
        if (subviews->count) {
            switch (this->axis) {
                case StackViewAxisVertical:
                    size.h += this->spacing * (subviews->count - 1);
                    break;
                case StackViewAxisHorizontal:
                    size.w += this->spacing * (subviews->count - 1);
                    break;
            }
        }
 
        release(subviews);
    }
 
    return size;
}
 
#pragma mark - StackView
 
static StackView *initWithFrame(StackView *self, const SDL_Rect *frame) {
 
    self = (StackView *) super(View, self, initWithFrame, frame);
    if (self) {
        self->view.autoresizingMask = ViewAutoresizingContain;
    }
 
    return self;
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
    ((ViewInterface *) clazz->interface)->applyStyle = applyStyle;
    ((ViewInterface *) clazz->interface)->init = init;
 
    ((ViewInterface *) clazz->interface)->layoutSubviews = layoutSubviews;
    ((ViewInterface *) clazz->interface)->sizeThatFits = sizeThatFits;
 
    ((StackViewInterface *) clazz->interface)->initWithFrame = initWithFrame;
}
 
Class *_StackView(void) {
    static Class *clazz;
    static Once once;
 
    do_once(&once, {
        clazz = _initialize(&(const ClassDef) {
            .name = "StackView",
            .superclass = _View(),
            .instanceSize = sizeof(StackView),
            .interfaceOffset = offsetof(StackView, interface),
            .interfaceSize = sizeof(StackViewInterface),
            .initialize = initialize,
        });
    });
 
    return clazz;
}
 
#undef _Class