Panel.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 "Panel.h"
 
#include "resize.png.h"
 
static Image *_resize;
 
#define _Class _Panel
 
#pragma mark - Object
 
static void dealloc(Object *self) {
 
    Panel *this = (Panel *) self;
 
    release(this->accessoryView);
    release(this->contentView);
    release(this->resizeHandle);
 
    super(Object, self, dealloc);
}
 
#pragma mark - View
 
static void applyStyle(View *self, const Style *style) {
 
    super(View, self, applyStyle, style);
 
    Panel *this = (Panel *) self;
 
    const Inlet inlets[] = MakeInlets(
        MakeInlet("draggable", InletTypeBool, &this->isDraggable, NULL),
        MakeInlet("resizable", InletTypeBool, &this->isResizable, NULL)
    );
 
    $(self, bind, inlets, (Dictionary *) style->attributes);
}
 
static void awakeWithDictionary(View *self, const Dictionary *dictionary) {
 
    super(View, self, awakeWithDictionary, dictionary);
 
    Panel *this = (Panel *) self;
 
    const Inlet inlets[] = MakeInlets(
        MakeInlet("accessoryView", InletTypeView, &this->accessoryView, NULL),
        MakeInlet("contentView", InletTypeView, &this->contentView, NULL),
        MakeInlet("stackView", InletTypeView, &this->stackView, NULL)
    );
 
    $(self, bind, inlets, dictionary);
}
 
static View *init(View *self) {
    return (View *) $((Panel *) self, initWithFrame, NULL);
}
 
static void layoutSubviews(View *self) {
 
    const Panel *this = (Panel *) self;
 
    const SDL_Size size = $(this, contentSize);
 
    $((View *) this->contentView, resize, &size);
 
    super(View, self, layoutSubviews);
 
    View *resizeHandle = (View *) this->resizeHandle;
 
    resizeHandle->frame.x = self->frame.w - resizeHandle->frame.w;
    resizeHandle->frame.y = self->frame.h - resizeHandle->frame.h;
 
    resizeHandle->hidden = !this->isResizable;
}
 
#pragma mark - Control
 
static _Bool captureEvent(Control *self, const SDL_Event *event) {
 
    Panel *this = (Panel *) self;
 
    if (event->type == SDL_MOUSEMOTION && (SDL_GetMouseState(NULL, NULL) & SDL_BUTTON_LMASK)) {
 
        if ((self->state & ControlStateHighlighted) == 0) {
            if ($((View *) this->resizeHandle, didReceiveEvent, event)) {
                self->state |= ControlStateHighlighted;
                this->isResizing = true;
            } else if (this->isDraggable) {
                self->state |= ControlStateHighlighted;
                this->isDragging = true;
            }
        }
 
        if (this->isResizing) {
            SDL_Size size = $((View *) self, size);
 
            size.w = clamp(size.w + event->motion.xrel, this->minSize.w, this->maxSize.w);
            size.h = clamp(size.h + event->motion.yrel, this->minSize.h, this->maxSize.h);
 
            $((View *) self, resize, &size);
        } else if (this->isDragging) {
            self->view.frame.x += event->motion.xrel;
            self->view.frame.y += event->motion.yrel;
        }
 
        return true;
    }
 
    if (event->type == SDL_MOUSEBUTTONUP && event->button.button == SDL_BUTTON_LEFT) {
        self->state &= ~ControlStateHighlighted;
        this->isResizing = this->isDragging = false;
        return true;
    }
 
    return super(Control, self, captureEvent, event);
}
 
#pragma mark - Panel
 
static SDL_Size contentSize(const Panel *self) {
 
    const View *accessoryView = (View *) self->accessoryView;
    const View *contentView = (View *) self->contentView;
 
    SDL_Size size = $(contentView, sizeThatContains);
 
    if (accessoryView->hidden == false) {
        const SDL_Size accessorySize = $(accessoryView, sizeThatContains);
        size.h -= accessorySize.h + self->stackView->spacing;
    }
 
    return size;
}
 
static Panel *initWithFrame(Panel *self, const SDL_Rect *frame) {
 
    self = (Panel *) super(Control, self, initWithFrame, frame);
    if (self) {
        View *this = (View *) self;
 
        self->isDraggable = true;
        self->isResizable = true;
 
        self->maxSize = MakeSize(INT32_MAX, INT32_MAX);
 
        self->stackView = $(alloc(StackView), initWithFrame, NULL);
        assert(self->stackView);
 
        $(this, addSubview, (View *) self->stackView);
 
        self->contentView = $(alloc(StackView), initWithFrame, NULL);
        assert(self->contentView);
 
        $((View *) self->contentView, addClassName, "contentView");
        $((View *) self->contentView, addClassName, "container");
 
        self->contentView->view.autoresizingMask |= ViewAutoresizingWidth;
 
        $((View *) self->stackView, addSubview, (View *) self->contentView);
 
        self->accessoryView = $(alloc(StackView), initWithFrame, NULL);
        assert(self->accessoryView);
 
        $((View *) self->accessoryView, addClassName, "accessoryView");
        $((View *) self->accessoryView, addClassName, "container");
 
        self->accessoryView->view.hidden = true;
 
        $((View *) self->stackView, addSubview, (View *) self->accessoryView);
 
        self->resizeHandle = $(alloc(ImageView), initWithImage, _resize);
        assert(self->resizeHandle);
 
        self->resizeHandle->view.alignment = ViewAlignmentInternal;
 
        self->resizeHandle->view.frame.w = DEFAULT_PANEL_RESIZE_HANDLE_SIZE;
        self->resizeHandle->view.frame.h = DEFAULT_PANEL_RESIZE_HANDLE_SIZE;
 
        $((View *) self, addSubview, (View *) self->resizeHandle);
    }
 
    return self;
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
    ((ObjectInterface *) clazz->interface)->dealloc = dealloc;
 
    ((ViewInterface *) clazz->interface)->applyStyle = applyStyle;
    ((ViewInterface *) clazz->interface)->awakeWithDictionary = awakeWithDictionary;
    ((ViewInterface *) clazz->interface)->init = init;
    ((ViewInterface *) clazz->interface)->layoutSubviews = layoutSubviews;
 
    ((ControlInterface *) clazz->interface)->captureEvent = captureEvent;
 
    ((PanelInterface *) clazz->interface)->contentSize = contentSize;
    ((PanelInterface *) clazz->interface)->initWithFrame = initWithFrame;
 
    _resize = $(alloc(Image), initWithBytes, resize_png, resize_png_len);
}
 
static void destroy(Class *clazz) {
    release(_resize);
}
 
Class *_Panel(void) {
    static Class *clazz;
    static Once once;
 
    do_once(&once, {
        clazz = _initialize(&(const ClassDef) {
            .name = "Panel",
            .superclass = _Control(),
            .instanceSize = sizeof(Panel),
            .interfaceOffset = offsetof(Panel, interface),
            .interfaceSize = sizeof(PanelInterface),
            .initialize = initialize,
            .destroy = destroy,
        });
    });
 
    return clazz;
}
 
#undef _Class