ProgressBar.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 <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
 
#include "ProgressBar.h"
 
#define _Class _ProgressBar
 
#pragma mark - Object
 
static void dealloc(Object *self) {
 
  ProgressBar *this = (ProgressBar *) self;
 
  memset(&this->delegate, 0, sizeof(this->delegate));
 
  release(this->background);
  release(this->foreground);
  release(this->label);
 
  free(this->labelFormat);
 
  super(Object, self, dealloc);
}
 
#pragma mark - View
 
static void awakeWithDictionary(View *self, const Dictionary *dictionary) {
 
  super(View, self, awakeWithDictionary, dictionary);
 
  ProgressBar *this = (ProgressBar *) self;
 
  double value = this->value;
 
  const Inlet inlets[] = MakeInlets(
    MakeInlet("background", InletTypeView, &this->background, NULL),
    MakeInlet("foreground", InletTypeView, &this->foreground, NULL),
    MakeInlet("label", InletTypeView, &this->label, NULL),
    MakeInlet("labelFormat", InletTypeCharacters, &this->labelFormat, NULL),
    MakeInlet("min", InletTypeDouble, &this->min, NULL),
    MakeInlet("max", InletTypeDouble, &this->max, NULL),
    MakeInlet("value", InletTypeDouble, &value, NULL)
  );
 
  $(self, bind, inlets, dictionary);
 
  $(this, setValue, value);
}
 
static View *init(View *self) {
  return (View *) $((ProgressBar *) self, initWithFrame, NULL);
}
 
#pragma mark - ProgressBar
 
static void formatLabel(ProgressBar *self) {
 
  char text[128];
  snprintf(text, sizeof(text), self->labelFormat, self->value);
 
  $(self->label, setText, text);
}
 
static ProgressBar *initWithFrame(ProgressBar *self, const SDL_Rect *frame) {
 
  self = (ProgressBar *) super(View, self, initWithFrame, frame);
  if (self) {
 
    self->background = $(alloc(ImageView), initWithFrame, NULL);
    assert(self->background);
 
    $((View *) self->background, addClassName, "background");
    $((View *) self, addSubview, (View *) self->background);
 
    self->foreground = $(alloc(ImageView), initWithFrame, NULL);
    assert(self->foreground);
 
    $((View *) self->foreground, addClassName, "foreground");
    $((View *) self, addSubview, (View *) self->foreground);
 
    self->label = $(alloc(Text), initWithText, NULL, NULL);
    assert(self->label);
 
    $((View *) self, addSubview, (View *) self->label);
 
    $(self, setLabelFormat, "%0.0lf%%");
 
    self->value = -1.0;
    self->max = 100.0;
  }
 
  return self;
}
 
static double progress(const ProgressBar *self) {
 
  if (self->max <= self->min) {
    return 0.0;
  }
 
  return 100.0 * (self->value - self->min) / (self->max - self->min);
}
 
static void setLabelFormat(ProgressBar *self, const char *labelFormat) {
 
  if (self->labelFormat) {
    free(self->labelFormat);
  }
 
  self->labelFormat = strdup(labelFormat);
  $(self, formatLabel);
}
 
static void setValue(ProgressBar *self, double value) {
 
  value = clamp(value, self->min, self->max);
 
  const double delta = fabs(self->value - value);
  if (delta > __DBL_EPSILON__) {
    self->value = value;
 
    const SDL_Rect bounds = $((View *) self, bounds);
    const double frac = $(self, progress) / 100.0;
 
    self->foreground->view.frame.w = bounds.w * frac;
    $((View *) self, setNeedsLayout);
 
    $(self, formatLabel);
 
    if (self->delegate.didSetValue) {
      self->delegate.didSetValue(self, self->value);
    }
  }
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
  ((ObjectInterface *) clazz->interface)->dealloc = dealloc;
 
  ((ViewInterface *) clazz->interface)->awakeWithDictionary = awakeWithDictionary;
  ((ViewInterface *) clazz->interface)->init = init;
 
  ((ProgressBarInterface *) clazz->interface)->formatLabel = formatLabel;
  ((ProgressBarInterface *) clazz->interface)->initWithFrame = initWithFrame;
  ((ProgressBarInterface *) clazz->interface)->progress = progress;
  ((ProgressBarInterface *) clazz->interface)->setLabelFormat = setLabelFormat;
  ((ProgressBarInterface *) clazz->interface)->setValue = setValue;
}
 
Class *_ProgressBar(void) {
  static Class *clazz;
  static Once once;
 
  do_once(&once, {
    clazz = _initialize(&(const ClassDef) {
      .name = "ProgressBar",
      .superclass = _View(),
      .instanceSize = sizeof(ProgressBar),
      .interfaceSize = sizeof(ProgressBarInterface),
      .initialize = initialize,
    });
  });
 
  return clazz;
}
 
#undef _Class