ScrollHandle.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 "ScrollHandle.h"
 
#define _Class _ScrollHandle
 
#pragma mark - View
 
static View *init(View *self) {
  return (View *) $((ScrollHandle *) self, initWithFrame, NULL);
}
 
#pragma mark - Control
 
static bool captureEvent(Control *self, const SDL_Event *event) {
 
  ScrollHandle *this = (ScrollHandle *) self;
 
  if (event->type == SDL_EVENT_MOUSE_BUTTON_DOWN) {
    if ($((View *) self, didReceiveEvent, event)) {
      self->state |= ControlStateHighlighted;
      return true;
    }
  } else if (event->type == SDL_EVENT_MOUSE_MOTION) {
    if (self->state & ControlStateHighlighted) {
      if (this->delegate.didDrag) {
        this->delegate.didDrag(this, event->motion.yrel);
      }
      return true;
    }
  } else if (event->type == SDL_EVENT_MOUSE_BUTTON_UP) {
    if (self->state & ControlStateHighlighted) {
      self->state &= ~ControlStateHighlighted;
      return true;
    }
  }
 
  return super(Control, self, captureEvent, event);
}
 
#pragma mark - ScrollHandle
 
static ScrollHandle *initWithFrame(ScrollHandle *self, const SDL_Rect *frame) {
 
  self = (ScrollHandle *) super(Control, self, initWithFrame, frame);
  if (self) {
    $((View *) self, addClassName, "handle");
  }
 
  return self;
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
  ((ViewInterface *) clazz->interface)->init = init;
 
  ((ControlInterface *) clazz->interface)->captureEvent = captureEvent;
 
  ((ScrollHandleInterface *) clazz->interface)->initWithFrame = initWithFrame;
}
 
Class *_ScrollHandle(void) {
  static Class *clazz;
  static Once once;
 
  do_once(&once, {
    clazz = _initialize(&(const ClassDef) {
      .name = "ScrollHandle",
      .superclass = _Control(),
      .instanceSize = sizeof(ScrollHandle),
      .interfaceOffset = offsetof(ScrollHandle, interface),
      .interfaceSize = sizeof(ScrollHandleInterface),
      .initialize = initialize,
    });
  });
 
  return clazz;
}
 
#undef _Class