TabView.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 <string.h>
 
#include <Objectively/String.h>
 
#include "TabView.h"
 
#define _Class _TabView
 
#pragma mark - Object
 
static void dealloc(Object *self) {
 
  TabView *this = (TabView *) self;
 
  memset(&this->delegate, 0, sizeof(this->delegate));
 
  release(this->tabPageView);
  release(this->tabSelectionView);
  release(this->tabs);
 
  super(Object, self, dealloc);
}
 
#pragma mark - View
 
static void awakeWithDictionary_tabs(const Array *array, ident obj, ident data) {
 
  const String *identifier = $((Dictionary *) obj, objectForKeyPath, "identifier");
  assert(identifier);
 
  TabViewItem *tab = $(alloc(TabViewItem), initWithIdentifier, identifier->chars);
  assert(tab);
 
  const Inlet inlets[] = MakeInlets(
    MakeInlet("label", InletTypeView, &tab->label, NULL),
    MakeInlet("view", InletTypeView, &tab->view, NULL)
  );
 
  $((View *) data, bind, inlets, obj);
  $((TabView *) data, addTab, tab);
 
  release(tab);
}
 
static void awakeWithDictionary(View *self, const Dictionary *dictionary) {
 
  super(View, self, awakeWithDictionary, dictionary);
 
  TabView *this = (TabView *) self;
 
  const Inlet inlets[] = MakeInlets(
    MakeInlet("tabPageView", InletTypeView, &this->tabPageView, NULL),
    MakeInlet("tabSelectionView", InletTypeView, &this->tabSelectionView, NULL)
  );
 
  $(self, bind, inlets, dictionary);
 
  const Array *tabs = $(dictionary, objectForKeyPath, "tabs");
  if (tabs) {
    $(tabs, enumerate, awakeWithDictionary_tabs, self);
  }
}
 
static View *init(View *self) {
  return (View *) $((TabView *) self, initWithFrame, NULL);
}
 
static void respondToEvent(View *self, const SDL_Event *event) {
 
  if (event->type == SDL_EVENT_MOUSE_BUTTON_UP) {
 
    TabView *this = (TabView *) self;
 
    const Array *tabs = (Array *) this->tabs;
    for (size_t i = 0; i < tabs->count; i++) {
 
      TabViewItem *tab = $(tabs, objectAtIndex, i);
 
      if ($((View *) tab->label, didReceiveEvent, event)) {
        $(this, selectTab, tab);
      }
    }
  }
 
  super(View, self, respondToEvent, event);
}
 
#pragma mark - TabView
 
static void addTab(TabView *self, TabViewItem *tab) {
 
  assert(tab);
 
  $(self->tabs, addObject, tab);
 
  $((View *) self->tabSelectionView, addSubview, (View *) tab->label);
  $((View *) self->tabPageView, addSubview, tab->view);
 
  if (self->delegate.didAddTab) {
    self->delegate.didAddTab(self, tab);
  }
 
  if (self->selectedTab == NULL) {
    $(self, selectTab, tab);
  }
}
 
static TabView *initWithFrame(TabView *self, const SDL_Rect *frame) {
 
  self = (TabView *) super(StackView, self, initWithFrame, frame);
  if (self) {
 
    self->tabPageView = $(alloc(PageView), initWithFrame, NULL);
    assert(self->tabPageView);
 
    self->tabs = $$(Array, array);
    assert(self->tabs);
 
    self->tabSelectionView = $(alloc(StackView), initWithFrame, NULL);
    assert(self->tabSelectionView);
 
    $((View *) self->tabSelectionView, addClassName, "tabSelectionView");
    $((View *) self, addSubview, (View *) self->tabSelectionView);
 
    $((View *) self->tabPageView, addClassName, "tabPageView");
    $((View *) self, addSubview, (View *) self->tabPageView);
  }
 
  return self;
}
 
static void removeTab(TabView *self, TabViewItem *tab) {
 
  assert(tab);
 
  if (self->delegate.willRemoveTab) {
    self->delegate.willRemoveTab(self, tab);
  }
 
  retain(tab);
 
  $(self->tabs, removeObject, tab);
 
  $((View *) self->tabSelectionView, removeSubview, (View *) tab->label);
  $((View *) self->tabPageView, removeSubview, tab->view);
 
  if (self->selectedTab == tab) {
    $(self, selectTab, NULL);
  }
 
  release(tab);
}
 
static void selectTab_enumerate(const Array *array, ident obj, ident data) {
 
  TabViewItem *tab = obj;
 
  int state = tab->state;
 
  if (tab == ((TabView *) data)->selectedTab) {
    state |= TabStateSelected;
  } else {
    state &= ~TabStateSelected;
  }
 
  $(tab, setState, state);
}
 
static void selectTab(TabView *self, TabViewItem *tab) {
 
  if (self->selectedTab != tab) {
 
    const Array *tabs = (Array *) self->tabs;
 
    if (tab) {
      self->selectedTab = tab;
    } else {
      self->selectedTab = $(tabs, firstObject);
    }
 
    $(tabs, enumerate, selectTab_enumerate, self);
 
    if (self->selectedTab) {
      $(self->tabPageView, setCurrentPage, self->selectedTab->view);
 
      if (self->delegate.didSelectTab) {
        self->delegate.didSelectTab(self, self->selectedTab);
      }
    }
 
    self->stackView.view.needsLayout = true;
  }
}
 
static bool tabWithIdentifier_predicate(const ident obj, ident data) {
 
  const TabViewItem *tab = obj;
 
  if (tab->identifier) {
    if (data) {
      return !strcmp(tab->identifier, data);
    } else {
      return false;
    }
  } else {
    return data == NULL;
  }
}
 
static TabViewItem *tabWithIdentifier(const TabView *self, const char *identifier) {
  return $((Array *) self->tabs, find, tabWithIdentifier_predicate, (ident) identifier);
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
  ((ObjectInterface *) clazz->interface)->dealloc = dealloc;
 
  ((ViewInterface *) clazz->interface)->awakeWithDictionary = awakeWithDictionary;
  ((ViewInterface *) clazz->interface)->init = init;
  ((ViewInterface *) clazz->interface)->respondToEvent = respondToEvent;
 
  ((TabViewInterface *) clazz->interface)->addTab = addTab;
  ((TabViewInterface *) clazz->interface)->initWithFrame = initWithFrame;
  ((TabViewInterface *) clazz->interface)->removeTab = removeTab;
  ((TabViewInterface *) clazz->interface)->selectTab = selectTab;
  ((TabViewInterface *) clazz->interface)->tabWithIdentifier = tabWithIdentifier;
}
 
Class *_TabView(void) {
  static Class *clazz;
  static Once once;
 
  do_once(&once, {
    clazz = _initialize(&(const ClassDef) {
      .name = "TabView",
      .superclass = _StackView(),
      .instanceSize = sizeof(TabView),
      .interfaceOffset = offsetof(TabView, interface),
      .interfaceSize = sizeof(TabViewInterface),
      .initialize = initialize,
    });
  });
 
  return clazz;
}
 
#undef _Class