Control.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 "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),
  MakeEnumAlias(ControlStateDisabled, disabled)
);
 
#define _Class _Control
 
#pragma mark - Object
 
static void dealloc(Object *self) {
 
  Control *this = (Control *) self;
 
  this->state = ControlStateDefault;
 
  super(Object, self, dealloc);
}
 
#pragma mark - View
 
static bool acceptsKeyResponder(const View *self) {
 
  Control *this = (Control *) self;
 
  return (this->state & ControlStateDisabled) == 0;
}
 
static bool acceptsTouchResponder(const View *self) {
 
  Control *this = (Control *) self;
 
  return (this->state & ControlStateDisabled) == 0;
}
 
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("bevel-dark-color", InletTypeColor, &this->bevelDarkColor, NULL),
    MakeInlet("bevel-light-color", InletTypeColor, &this->bevelLightColor, NULL),
    MakeInlet("selection", InletTypeEnum, &this->selection, (ident) ControlSelectionNames)
  );
 
  $(self, bind, inlets, (Dictionary *) style->attributes);
}
 
static void awakeWithDictionary(View *self, const Dictionary *dictionary) {
 
  super(View, self, awakeWithDictionary, dictionary);
 
  Control *this = (Control *) self;
 
  const Inlet inlets[] = MakeInlets(
    MakeInlet("state", InletTypeEnum, &this->state, (ident) ControlStateNames)
  );
 
  $(self, bind, inlets, dictionary);
}
 
static View *init(View *self) {
  return (View *) $((Control *) self, initWithFrame, NULL);
}
 
static void becomeKeyResponder(View *self) {
 
  Control *this = (Control *) self;
 
  if (!$(this, isFocused)) {
 
    this->state |= ControlStateFocused;
 
    $(this, stateDidChange);
  }
 
  super(View, self, becomeKeyResponder);
}
 
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 (self->borderRadius > 0) {
 
    if (this->bevel == ControlBevelInset) {
      $(renderer, drawBevel, &frame, self->borderRadius, 1, &this->bevelDarkColor, &this->bevelLightColor);
    } else if (this->bevel == ControlBevelOutset) {
      $(renderer, drawBevel, &frame, self->borderRadius, 1, &this->bevelLightColor, &this->bevelDarkColor);
    }
 
    if (this->state & ControlStateFocused) {
      $(renderer, drawRoundedRect, &frame, self->borderRadius, 1, &Colors.Charcoal);
    }
 
  } else {
 
    if (this->bevel == ControlBevelInset) {
 
      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), &this->bevelLightColor);
 
      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), &this->bevelDarkColor);
 
    } else if (this->bevel == ControlBevelOutset) {
 
      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), &this->bevelDarkColor);
 
      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), &this->bevelLightColor);
    }
 
    if (this->state & ControlStateFocused) {
      $(renderer, drawRect, &frame, &Colors.Charcoal);
    }
  }
}
 
static void resignKeyResponder(View *self) {
 
  Control *this = (Control *) self;
 
  if ($(this, isHighlighted) || $(this, isFocused)) {
 
    this->state &= ~ControlStateHighlighted;
    this->state &= ~ControlStateFocused;
 
    $(this, stateDidChange);
  }
 
  super(View, self, resignKeyResponder);
}
 
static void respondToEvent(View *self, const SDL_Event *event) {
 
  Control *this = (Control *) self;
 
  retain(self);
 
  const ControlState state = (ControlState) this->state;
  if (!(state & ControlStateDisabled)) {
    if ($(this, captureEvent, event)) {
      if (this->state != state) {
        $(this, stateDidChange);
      }
      release(self);
      return;
    }
  }
 
  super(View, self, respondToEvent, event);
 
  release(self);
}
 
#pragma mark - Control
 
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->bevelDarkColor = Colors.Black;
    self->bevelLightColor = Colors.Silver;
  }
 
  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 & ControlStateFocused) {
    $(this, emitViewEvent, ViewEventFocus, NULL);
  } else {
    $(this, emitViewEvent, ViewEventBlur, NULL);
  }
 
  $(this, invalidateStyle);
 
  $(this, setNeedsLayout);
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
  ((ObjectInterface *) clazz->interface)->dealloc = dealloc;
 
  ((ViewInterface *) clazz->interface)->acceptsKeyResponder = acceptsKeyResponder;
  ((ViewInterface *) clazz->interface)->acceptsTouchResponder = acceptsTouchResponder;
  ((ViewInterface *) clazz->interface)->applyStyle = applyStyle;
  ((ViewInterface *) clazz->interface)->awakeWithDictionary = awakeWithDictionary;
  ((ViewInterface *) clazz->interface)->becomeKeyResponder = becomeKeyResponder;
  ((ViewInterface *) clazz->interface)->init = init;
  ((ViewInterface *) clazz->interface)->matchesSelector = matchesSelector;
  ((ViewInterface *) clazz->interface)->render = render;
  ((ViewInterface *) clazz->interface)->resignKeyResponder = resignKeyResponder;
  ((ViewInterface *) clazz->interface)->respondToEvent = respondToEvent;
 
  ((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),
      .interfaceSize = sizeof(ControlInterface),
      .initialize = initialize,
    });
  });
 
  return clazz;
}
 
#undef _Class