Control.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 "Control.h"
 
const EnumName ControlBevelNames[] = MakeEnumNames(
    MakeEnumAlias(ControlBevelNone, none),
    MakeEnumAlias(ControlBevelInset, inset),
    MakeEnumAlias(ControlBevelOutset, outset)
);
 
const EnumName ControlSelectionNames[] = MakeEnumNames(
    MakeEnumAlias(ControlSelectionNone, none),
    MakeEnumAlias(ControlSelectionSingle, single),
    MakeEnumAlias(ControlSelectionMultiple, multiple)
);
 
const EnumName ControlStateNames[] = MakeEnumNames(
    MakeEnumAlias(ControlStateDefault, default),
    MakeEnumAlias(ControlStateHighlighted, highlighted),
    MakeEnumAlias(ControlStateSelected, selected),
    MakeEnumAlias(ControlStateFocused, focused)
);
 
#define _Class _Control
 
#pragma mark - Object
 
static void dealloc(Object *self) {
 
    Control *this = (Control *) self;
 
    release(this->actions);
 
    super(Object, self, dealloc);
}
 
#pragma mark - View
 
static _Bool acceptsFirstResponder(const View *self) {
    return true;
}
 
static void applyStyle(View *self, const Style *style) {
 
    super(View, self, applyStyle, style);
 
    Control *this = (Control *) self;
 
    const Inlet inlets[] = MakeInlets(
        MakeInlet("bevel", InletTypeEnum, &this->bevel, (ident) (ControlBevelNames)),
        MakeInlet("selection", InletTypeEnum, &this->selection, (ident) ControlSelectionNames)
    );
 
    $(self, bind, inlets, (Dictionary *) style->attributes);
}
 
static View *init(View *self) {
    return (View *) $((Control *) self, initWithFrame, NULL);
}
 
static _Bool matchesSelector(const View *self, const SimpleSelector *simpleSelector) {
 
    assert(simpleSelector);
 
    const Control *this = (Control *) self;
 
    switch (simpleSelector->type) {
        case SimpleSelectorTypePseudo:
            if (strcmp("highlighted", simpleSelector->pattern) == 0) {
                return $(this, isHighlighted);
            } else if (strcmp("disabled", simpleSelector->pattern) == 0) {
                return $(this, isDisabled);
            } else if (strcmp("selected", simpleSelector->pattern) == 0) {
                return $(this, isSelected);
            } else if (strcmp("focused", simpleSelector->pattern) == 0) {
                return $(this, isFocused);
            } else if (strcmp("single", simpleSelector->pattern) == 0) {
                return this->selection == ControlSelectionSingle;
            } else if (strcmp("multiple", simpleSelector->pattern) == 0) {
                return this->selection == ControlSelectionMultiple;
            }
            break;
        default:
            break;
    }
 
    return super(View, self, matchesSelector, simpleSelector);
}
 
static void render(View *self, Renderer *renderer) {
 
    super(View, self, render, renderer);
 
    Control *this = (Control *) self;
 
    const SDL_Rect frame = $(self, renderFrame);
 
    if (this->bevel == ControlBevelInset) {
 
        $(renderer, setDrawColor, &Colors.Silver);
 
        SDL_Point points[3];
 
        points[0].x = frame.x;
        points[0].y = frame.y + frame.h;
 
        points[1].x = frame.x + frame.w;
        points[1].y = frame.y + frame.h;
 
        points[2].x = frame.x + frame.w;
        points[2].y = frame.y;
 
        $(renderer, drawLines, points, lengthof(points));
 
        $(renderer, setDrawColor, &Colors.Black);
 
        points[0].x = frame.x;
        points[0].y = frame.y + frame.h;
 
        points[1].x = frame.x;
        points[1].y = frame.y;
 
        points[2].x = frame.x + frame.w;
        points[2].y = frame.y;
 
        $(renderer, drawLines, points, lengthof(points));
 
    } else if (this->bevel == ControlBevelOutset) {
 
        $(renderer, setDrawColor, &Colors.Black);
 
        SDL_Point points[3];
 
        points[0].x = frame.x;
        points[0].y = frame.y + frame.h;
 
        points[1].x = frame.x + frame.w;
        points[1].y = frame.y + frame.h;
 
        points[2].x = frame.x + frame.w;
        points[2].y = frame.y;
 
        $(renderer, drawLines, points, lengthof(points));
 
        $(renderer, setDrawColor, &Colors.Silver);
 
        points[0].x = frame.x;
        points[0].y = frame.y + frame.h;
 
        points[1].x = frame.x;
        points[1].y = frame.y;
 
        points[2].x = frame.x + frame.w;
        points[2].y = frame.y;
 
        $(renderer, drawLines, points, lengthof(points));
    }
 
    if (this->state & ControlStateFocused) {
 
        $(renderer, setDrawColor, &Colors.Charcoal);
 
        $(renderer, drawRect, &frame);
    }
 
    $(renderer, setDrawColor, &Colors.White);
}
 
static void respondToEvent(View *self, const SDL_Event *event) {
 
    Control *this = (Control *) self;
 
    const ControlState state = this->state;
 
    const _Bool didCaptureEvent = $(this, captureEvent, event);
    if (didCaptureEvent) {
 
        const Array *actions = (Array *) this->actions;
        for (size_t i = 0; i < actions->count; i++) {
 
            const Action *action = $(actions, objectAtIndex, i);
            if (action->eventType == event->type) {
                action->function(this, event, action->sender, action->data);
            }
        }
    }
 
    if (this->state != state) {
        $(this, stateDidChange);
    }
 
    if (didCaptureEvent) {
        return;
    }
 
    super(View, self, respondToEvent, event);
}
 
#pragma mark - Control
 
static _Bool actionsForEvent_predicate(const ident obj, ident data) {
    return ((Action *) obj)->eventType == ((SDL_Event *) data)->type;
}
 
static Array *actionsForEvent(const Control *self, const SDL_Event *event) {
    return $((Array *) self->actions, filteredArray, actionsForEvent_predicate, (ident) event);
}
 
static void addActionForEventType(Control *self, SDL_EventType eventType, ActionFunction function, ident sender, ident data) {
 
    Action *action = $(alloc(Action), initWithEventType, eventType, function, sender, data);
 
    $(self->actions, addObject, action);
 
    release(action);
}
 
static _Bool captureEvent(Control *self, const SDL_Event *event) {
    return false;
}
 
static Control *initWithFrame(Control *self, const SDL_Rect *frame) {
 
    self = (Control *) super(View, self, initWithFrame, frame);
    if (self) {
 
        self->actions = $$(MutableArray, arrayWithCapacity, 0);
        assert(self->actions);
    }
 
    return self;
}
 
static _Bool isDisabled(const Control *self) {
    return (self->state & ControlStateDisabled) == ControlStateDisabled;
}
 
static _Bool isFocused(const Control *self) {
    return (self->state & ControlStateFocused) == ControlStateFocused;
}
 
static _Bool isHighlighted(const Control *self) {
    return (self->state & ControlStateHighlighted) == ControlStateHighlighted;
}
 
static _Bool isSelected(const Control *self) {
    return (self->state & ControlStateSelected) == ControlStateSelected;
}
 
static void stateDidChange(Control *self) {
 
    View *this = (View *) self;
 
    if (self->state & (ControlStateHighlighted | ControlStateFocused)) {
        $(this, becomeFirstResponder);
    } else {
        $(this, resignFirstResponder);
    }
 
    $(this, invalidateStyle);
 
    this->needsLayout = true;
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
    ((ObjectInterface *) clazz->interface)->dealloc = dealloc;
 
    ((ViewInterface *) clazz->interface)->acceptsFirstResponder = acceptsFirstResponder;
    ((ViewInterface *) clazz->interface)->applyStyle = applyStyle;
    ((ViewInterface *) clazz->interface)->init = init;
    ((ViewInterface *) clazz->interface)->matchesSelector = matchesSelector;
    ((ViewInterface *) clazz->interface)->render = render;
    ((ViewInterface *) clazz->interface)->respondToEvent = respondToEvent;
 
    ((ControlInterface *) clazz->interface)->actionsForEvent = actionsForEvent;
    ((ControlInterface *) clazz->interface)->addActionForEventType = addActionForEventType;
    ((ControlInterface *) clazz->interface)->captureEvent = captureEvent;
    ((ControlInterface *) clazz->interface)->initWithFrame = initWithFrame;
    ((ControlInterface *) clazz->interface)->isDisabled = isDisabled;
    ((ControlInterface *) clazz->interface)->isFocused = isFocused;
    ((ControlInterface *) clazz->interface)->isHighlighted = isHighlighted;
    ((ControlInterface *) clazz->interface)->isSelected = isSelected;
    ((ControlInterface *) clazz->interface)->stateDidChange = stateDidChange;
}
 
Class *_Control(void) {
    static Class *clazz;
    static Once once;
 
    do_once(&once, {
        clazz = _initialize(&(const ClassDef) {
            .name = "Control",
            .superclass = _View(),
            .instanceSize = sizeof(Control),
            .interfaceOffset = offsetof(Control, interface),
            .interfaceSize = sizeof(ControlInterface),
            .initialize = initialize,
        });
    });
 
    return clazz;
}
 
#undef _Class