this._headerWindow = new Window_Base(0, 0, Graphics.boxWidth, windowHeight);
this._headerWindow.opacity = 255;
this.addWindow(this._headerWindow);
this._headerWindow.contents.fontSize = 64;
this._headerWindow.drawText("Items", 0, 25, Graphics.boxWidth, 'center');
};

Scene_Inventory.prototype.createTabButton = function() {
var x = Graphics.boxWidth - buttonWidth - 30;
var y = Graphics.boxHeight - buttonHeight - 30;

this._tabButton = new Window_TabButton(x, y, buttonWidth, buttonHeight, "Equipment");
this._tabButton.setHandler('ok', this.commandEquipment.bind(this));
this._tabButton.setHandler('cancel', this.commandCancel.bind(this));
this.addWindow(this._tabButton);
};

Scene_Inventory.prototype.createGoldWindow = function() {
this._goldWindow = new Window_Gold();
this._goldWindow.x = 20;
this._goldWindow.y = Graphics.boxHeight - this._goldWindow.height - 20;
this.addWindow(this._goldWindow);
};

Scene_Inventory.prototype.createItemWindows = function() {
this._categoryWindow = new Window_ItemCategory();
this._categoryWindow.y = 120;
this._categoryWindow.setHandler('ok', this.onCategoryOk.bind(this));
this._categoryWindow.setHandler('cancel', this.commandCancel.bind(this));
this.addWindow(this._categoryWindow);

var wy = this._categoryWindow.y + this._categoryWindow.height;
var wh = Graphics.boxHeight - wy - 190;
this._itemWindow = new Window_ItemList(0, wy, Graphics.boxWidth, wh);
this._itemWindow.setHelpWindow(this._helpWindow);
this._itemWindow.setHandler('ok', this.onItemOk.bind(this));
this._itemWindow.setHandler('cancel', this.onItemCancel.bind(this));
this._categoryWindow.setItemWindow(this._itemWindow);
this.addWindow(this._itemWindow);
};

Scene_Inventory.prototype.commandEquipment = function() {
SoundManager.playOk();
SceneManager.push(Scene_Equip);
};

Scene_Inventory.prototype.commandCancel = function() {
SoundManager.playCancel();
this.popScene();
};

Scene_Inventory.prototype.onCategoryOk = function() {
this._itemWindow.activate();
this._itemWindow.select(0);
};

Scene_Inventory.prototype.onItemOk = function() {
var item = this._itemWindow.item();
if (item) {
this._itemWindow.activate();
}
};

Scene_Inventory.prototype.onItemCancel = function() {
this._categoryWindow.activate();
this._itemWindow.deselect();
};

Scene_Inventory.prototype.update = function() {
Scene_MenuBase.prototype.update.call(this);
this.updateTabNavigation();
};

Scene_Inventory.prototype.updateTabNavigation = function() {
var activeWindow = this.getActiveWindow();

if (activeWindow && activeWindow.active && Input.isTriggered('down')) {
activeWindow.deactivate();
activeWindow.deselect();
this._tabButton.activate();
this._tabButton.select(0);
} else if (this._tabButton.active && Input.isTriggered('up')) {
this._tabButton.deactivate();
this._tabButton.deselect();
this.activateMainWindow();
}

if (this._tabButton.active && Input.isTriggered('ok')) {
this._tabButton.processOk();
}
};

Scene_Inventory.prototype.getActiveWindow = function() {
return this._categoryWindow.active ? this._categoryWindow :
this._itemWindow.active ? this._itemWindow : null;
};

Scene_Inventory.prototype.activateMainWindow = function() {
this._categoryWindow.activate();
this._categoryWindow.select(0);
};

Scene_Menu.prototype.commandItem = function() {
SceneManager.push(Scene_Inventory);
};

})();