Button.c

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/*
 * ObjectivelyMVC: Object oriented MVC framework for SDL3 and 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 "Button.h"
 
#define _Class _Button
 
#pragma mark - Object
 
static void dealloc(Object *self) {
 
  Button *this = (Button *) self;
 
  memset(&this->delegate, 0, sizeof(this->delegate));
 
  release(this->image);
  release(this->title);
 
  super(Object, self, dealloc);
}
 
#pragma mark - View
 
static void awakeWithDictionary(View *self, const Dictionary *dictionary) {
 
  super(View, self, awakeWithDictionary, dictionary);
 
  Button *this = (Button *) self;
 
  const Inlet inlets[] = MakeInlets(
    MakeInlet("title", InletTypeView, &this->title, NULL),
    MakeInlet("image", InletTypeImage, &this->image->image, NULL)
  );
 
  $(self, bind, inlets, dictionary);
}
 
static View *init(View *self) {
  return (View *) $((Button *) self, initWithFrame, NULL);
}
 
#pragma mark - Control
 
static bool captureEvent(Control *self, const SDL_Event *event) {
 
  Button *this = (Button *) self;
 
  View *view = (View *) self;
 
  const bool didReceiveEvent = $(view, didReceiveEvent, event);
 
  if (event->type == SDL_EVENT_MOUSE_BUTTON_DOWN) {
    if (didReceiveEvent) {
      self->state |= ControlStateHighlighted;
    }
    return true;
  }
 
  if (event->type == SDL_EVENT_MOUSE_BUTTON_UP) {
    $(view, resignKeyResponder);
 
    self->state &= ~ControlStateHighlighted;
    if (didReceiveEvent) {
      if (event->button.clicks) {
        if (this->delegate.didClick) {
          this->delegate.didClick(this);
        }
        $(view, emitViewEvent, ViewEventClick, NULL);
      }
    }
    return true;
  }
 
  if (event->type == SDL_EVENT_MOUSE_MOTION) {
    if (self->state & ControlStateHighlighted) {
      return true;
    }
  }
 
  if (event->type == SDL_EVENT_KEY_DOWN) {
    switch (event->key.key) {
      case SDLK_SPACE:
      case SDLK_KP_SPACE:
      case SDLK_RETURN:
      case SDLK_KP_ENTER:
        if (this->delegate.didClick) {
          this->delegate.didClick(this);
        }
        $(view, emitViewEvent, ViewEventClick, NULL);
        return true;
      default:
        break;
    }
  }
 
  return super(Control, self, captureEvent, event);
}
 
#pragma mark - Button
 
static Button *initWithFrame(Button *self, const SDL_Rect *frame) {
 
  self = (Button *) super(Control, self, initWithFrame, frame);
  if (self) {
 
    self->image = $(alloc(ImageView), initWithFrame, frame);
    assert(self->image);
 
    $((View *) self, addSubview, (View *) self->image);
 
    self->title = $(alloc(Text), initWithText, NULL, NULL);
    assert(self->title);
 
    $((View *) self, addSubview, (View *) self->title);
  }
 
  return self;
}
 
static Button *initWithImage(Button *self, Image *image) {
 
  self = $(self, initWithFrame, NULL);
  if (self) {
    $(self->image, setImage, image);
  }
  return self;
}
 
static Button *initWithTitle(Button *self, const char *title) {
 
  self = $(self, initWithFrame, NULL);
  if (self) {
    $(self->title, setText, title);
  }
  return self;
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
  ((ObjectInterface *) clazz->interface)->dealloc = dealloc;
 
  ((ViewInterface *) clazz->interface)->awakeWithDictionary = awakeWithDictionary;
  ((ViewInterface *) clazz->interface)->init = init;
 
  ((ControlInterface *) clazz->interface)->captureEvent = captureEvent;
 
  ((ButtonInterface *) clazz->interface)->initWithFrame = initWithFrame;
  ((ButtonInterface *) clazz->interface)->initWithImage = initWithImage;
  ((ButtonInterface *) clazz->interface)->initWithTitle = initWithTitle;
}
 
Class *_Button(void) {
  static Class *clazz;
  static Once once;
 
  do_once(&once, {
    clazz = _initialize(&(const ClassDef) {
      .name = "Button",
      .superclass = _Control(),
      .instanceSize = sizeof(Button),
      .interfaceOffset = offsetof(Button, interface),
      .interfaceSize = sizeof(ButtonInterface),
      .initialize = initialize,
    });
  });
 
  return clazz;
}
 
#undef _Class