//*****************************************************************************
// Do not remove this notice.
//
// Copyright 2001 by Mike Hall.
// See http://www.brainjar.com for terms of use.
//*****************************************************************************

// Determine browser and version.

function Browser() {

  var ua, s, i;

  this.isIE    = false;  // Internet Explorer
  this.isNS    = false;  // Netscape
  this.version = null;

  ua = navigator.userAgent;

  s = "MSIE";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isIE = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }

  s = "Netscape6/";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }

  // Treat any other "Gecko" browser as NS 6.1.

  s = "Gecko";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = 6.1;
    return;
  }
}

var browser = new Browser();

//=============================================================================
// Window Object
//=============================================================================

function Window(el) {

  var i, mapList, mapName;

  // Get window components.

  this.frame           = el;
  this.titleBar        = winFindByClassName(el, "titleBar");
  this.titleBarText    = winFindByClassName(el, "titleBarText");
  this.titleBarButtons = winFindByClassName(el, "titleBarButtons");
  this.clientArea      = winFindByClassName(el, "clientArea");

  // Find matching button image map.

  mapName = this.titleBarButtons.useMap.substr(1);
  mapList = document.getElementsByTagName("MAP");
  for (i = 0; i < mapList.length; i++)
    if (mapList[i].name == mapName)
      this.titleBarMap = mapList[i];

  // Save colors.

  this.activeFrameBackgroundColor  = this.frame.style.backgroundColor;
  this.activeFrameBorderColor      = this.frame.style.borderColor;
  this.activeTitleBarColor         = this.titleBar.style.backgroundColor;
  this.activeTitleTextColor        = this.titleBar.style.color;
  this.activeClientAreaBorderColor = this.clientArea.style.borderColor;
  if (browser.isIE)
    this.activeClientAreaScrollbarColor = this.clientArea.style.scrollbarBaseColor;

  // Save images.

  this.activeButtonsImage   = this.titleBarButtons.src;
  this.inactiveButtonsImage = this.titleBarButtons.longDesc;

  // Set flags.

  this.isOpen      = false;
  this.isMinimized = false;

  // Set methods.

  this.open       = winOpen;
  this.close      = winClose;
  this.minimize   = winMinimize;
  this.restore    = winRestore;
  this.makeActive = winMakeActive;

  // Set up event handling.

  this.frame.parentWindow = this;
  this.frame.onmousemove  = winResizeCursorSet;
  this.frame.onmouseout   = winResizeCursorRestore;
  this.frame.onmousedown  = winResizeDragStart;

  this.titleBar.parentWindow = this;
  this.titleBar.onmousedown  = winMoveDragStart;

  this.clientArea.parentWindow = this;
  this.clientArea.onclick      = winClientAreaClick;

  for (i = 0; i < this.titleBarMap.childNodes.length; i++)
    if (this.titleBarMap.childNodes[i].tagName == "AREA")
      this.titleBarMap.childNodes[i].parentWindow = this;

  // Calculate the minimum width and height values for resizing
  // and fix any initial display problems.

  var initLt, initWd, w, dw;

  // Save the inital frame width and position, then reposition
  // the window.

  initLt = this.frame.style.left;
  initWd = parseInt(this.frame.style.width);
  this.frame.style.left = -this.titleBarText.offsetWidth + "px";

  // For IE, start calculating the value to use when setting
  // the client area width based on the frame width.

  if (browser.isIE) {
    this.titleBarText.style.display = "none";
    w = this.clientArea.offsetWidth;
    this.widthDiff = this.frame.offsetWidth - w;
    this.clientArea.style.width = w + "px";
    dw = this.clientArea.offsetWidth - w;
    w -= dw;     
    this.widthDiff += dw;
    this.titleBarText.style.display = "";
  }

  // Find the difference between the frame's style and offset
  // widths. For IE, adjust the client area/frame width
  // difference accordingly.

  w = this.frame.offsetWidth;
  this.frame.style.width = w + "px";
  dw = this.frame.offsetWidth - w;
  w -= dw;     
  this.frame.style.width = w + "px";
  if (browser.isIE)
    this.widthDiff -= dw;

  // Find the minimum width for resize.

  this.isOpen = true;  // Flag as open so minimize call will work.
  this.minimize();
  // Get the minimum width.
  if (browser.isNS && browser.version >= 1.2)
    // For later versions of Gecko.
    this.minimumWidth = this.frame.offsetWidth;
  else
    // For all others.
    this.minimumWidth = this.frame.offsetWidth - dw;

  // Find the frame width at which or below the title bar text will
  // need to be clipped.

  this.titleBarText.style.width = "";
  this.clipTextMinimumWidth = this.frame.offsetWidth - dw;

  // Set the minimum height.

  this.minimumHeight = 1;

  // Restore window. For IE, set client area width.

  this.restore();
  this.isOpen = false;  // Reset flag.
  initWd = Math.max(initWd, this.minimumWidth);
  this.frame.style.width = initWd + "px";
  if (browser.isIE)
    this.clientArea.style.width = (initWd - this.widthDiff) + "px";

  // Clip the title bar text if needed.

  if (this.clipTextMinimumWidth >= this.minimumWidth)
    this.titleBarText.style.width = (winCtrl.minimizedTextWidth + initWd - this.minimumWidth) + "px";

  // Restore the window to its original position.

  this.frame.style.left = initLt;
}

//=============================================================================
// Window Methods
//=============================================================================

function winOpen() {

  if (this.isOpen)
    return;

  // Restore the window and make it visible.

  this.makeActive();
  this.isOpen = true;
  if (this.isMinimized)
    this.restore();
  this.frame.style.visibility = "visible";
}

function winClose() {

  // Hide the window.

  this.frame.style.visibility = "hidden";
  this.isOpen = false;
}

function winMinimize() {

  if (!this.isOpen || this.isMinimized)
    return;

  this.makeActive();

  // Save current frame and title bar text widths.

  this.restoreFrameWidth = this.frame.style.width;
  this.restoreTextWidth = this.titleBarText.style.width;

  // Disable client area display.

  this.clientArea.style.display = "none";

  // Minimize frame and title bar text widths.

  if (this.minimumWidth)
    this.frame.style.width = this.minimumWidth + "px";
  else
    this.frame.style.width = "";
  this.titleBarText.style.width = winCtrl.minimizedTextWidth + "px";

  this.isMinimized = true;
}

function winRestore() {

  if (!this.isOpen || !this.isMinimized)
    return;

  this.makeActive();

  // Enable client area display.

  this.clientArea.style.display = "";

  // Restore frame and title bar text widths.

  this.frame.style.width = this.restoreFrameWidth;
  this.titleBarText.style.width = this.restoreTextWidth;

  this.isMinimized = false;
}

function winMakeActive() {

  if (winCtrl.active == this)
    return;

  // Inactivate the currently active window.

  if (winCtrl.active) {
    winCtrl.active.frame.style.backgroundColor    = winCtrl.inactiveFrameBackgroundColor;
    winCtrl.active.frame.style.borderColor        = winCtrl.inactiveFrameBorderColor;
    winCtrl.active.titleBar.style.backgroundColor = winCtrl.inactiveTitleBarColor;
    winCtrl.active.titleBar.style.color           = winCtrl.inactiveTitleTextColor;
    winCtrl.active.clientArea.style.borderColor   = winCtrl.inactiveClientAreaBorderColor;
    if (browser.isIE)
      winCtrl.active.clientArea.style.scrollbarBaseColor = winCtrl.inactiveClientAreaScrollbarColor;
    if (browser.isNS && browser.version < 6.1)
      winCtrl.active.clientArea.style.overflow = "hidden";
    if (winCtrl.active.inactiveButtonsImage)
      winCtrl.active.titleBarButtons.src = winCtrl.active.inactiveButtonsImage;
  }

  // Activate this window.

  this.frame.style.backgroundColor    = this.activeFrameBackgroundColor;
  this.frame.style.borderColor        = this.activeFrameBorderColor;
  this.titleBar.style.backgroundColor = this.activeTitleBarColor;
  this.titleBar.style.color           = this.activeTitleTextColor;
  this.clientArea.style.borderColor   = this.activeClientAreaBorderColor;
  if (browser.isIE)
    this.clientArea.style.scrollbarBaseColor = this.activeClientAreaScrollbarColor;
  if (browser.isNS && browser.version < 6.1)
    this.clientArea.style.overflow = "auto";
  if (this.inactiveButtonsImage)
    this.titleBarButtons.src = this.activeButtonsImage;
  this.frame.style.zIndex = ++winCtrl.maxzIndex;
  winCtrl.active = this;
}

//=============================================================================
// Event handlers.
//=============================================================================

function winClientAreaClick(event) {

  // Make this window the active one.

  this.parentWindow.makeActive();
}

//-----------------------------------------------------------------------------
// Window dragging.
//-----------------------------------------------------------------------------

function winMoveDragStart(event) {

  var target;
  var x, y;

  if (browser.isIE)
    target = window.event.srcElement.tagName;
  if (browser.isNS)
    target = event.target.tagName;

  if (target == "AREA")
    return;

  this.parentWindow.makeActive();

  // Get cursor offset from window frame.