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   1  /*
   2  tip_centerwindow.js  v. 1.21
   3  
   4  The latest version is available at
   5  http://www.walterzorn.com
   6  or http://www.devira.com
   7  or http://www.walterzorn.de
   8  
   9  Initial author: Walter Zorn
  10  Last modified: 3.6.2008
  11  
  12  Extension for the tooltip library wz_tooltip.js.
  13  Centers a sticky tooltip in the window's visible clientarea,
  14  optionally even if the window is being scrolled or resized.
  15  */
  16  
  17  // Make sure that the core file wz_tooltip.js is included first
  18  if(typeof config == "undefined")
  19      alert("Error:\nThe core tooltip script file 'wz_tooltip.js' must be included first, before the plugin files!");
  20  
  21  // Here we define new global configuration variable(s) (as members of the
  22  // predefined "config." class).
  23  // From each of these config variables, wz_tooltip.js will automatically derive
  24  // a command which can be passed to Tip() or TagToTip() in order to customize
  25  // tooltips individually. These command names are just the config variable
  26  // name(s) translated to uppercase,
  27  // e.g. from config. CenterWindow a command CENTERWINDOW will automatically be
  28  // created.
  29  
  30  //===================  GLOBAL TOOPTIP CONFIGURATION  =========================//
  31  config. CenterWindow = false    // true or false - set to true if you want this to be the default behaviour
  32  config. CenterAlways = false    // true or false - recenter if window is resized or scrolled
  33  //=======  END OF TOOLTIP CONFIG, DO NOT CHANGE ANYTHING BELOW  ==============//
  34  
  35  
  36  // Create a new tt_Extension object (make sure that the name of that object,
  37  // here ctrwnd, is unique amongst the extensions available for
  38  // wz_tooltips.js):
  39  var ctrwnd = new tt_Extension();
  40  
  41  // Implement extension eventhandlers on which our extension should react
  42  ctrwnd.OnLoadConfig = function()
  43  {
  44      if(tt_aV[CENTERWINDOW])
  45      {
  46          // Permit CENTERWINDOW only if the tooltip is sticky
  47          if(tt_aV[STICKY])
  48          {
  49              if(tt_aV[CENTERALWAYS])
  50              {
  51                  // IE doesn't support style.position "fixed"
  52                  if(tt_ie)
  53                      tt_AddEvtFnc(window, "scroll", Ctrwnd_DoCenter);
  54                  else
  55                      tt_aElt[0].style.position = "fixed";
  56                  tt_AddEvtFnc(window, "resize", Ctrwnd_DoCenter);
  57              }
  58              return true;
  59          }
  60          tt_aV[CENTERWINDOW] = false;
  61      }
  62      return false;
  63  };
  64  // We react on the first OnMouseMove event to center the tip on that occasion
  65  ctrwnd.OnMoveBefore = Ctrwnd_DoCenter;
  66  ctrwnd.OnKill = function()
  67  {
  68      if(tt_aV[CENTERWINDOW] && tt_aV[CENTERALWAYS])
  69      {
  70          tt_RemEvtFnc(window, "resize", Ctrwnd_DoCenter);
  71          if(tt_ie)
  72              tt_RemEvtFnc(window, "scroll", Ctrwnd_DoCenter);
  73          else
  74              tt_aElt[0].style.position = "absolute";
  75      }
  76      return false;
  77  };
  78  // Helper function
  79  function Ctrwnd_DoCenter()
  80  {
  81      if(tt_aV[CENTERWINDOW])
  82      {
  83          var x, y, dx, dy;
  84  
  85          // Here we use some functions and variables (tt_w, tt_h) which the
  86          // extension API of wz_tooltip.js provides for us
  87          if(tt_ie || !tt_aV[CENTERALWAYS])
  88          {
  89              dx = tt_GetScrollX();
  90              dy = tt_GetScrollY();
  91          }
  92          else
  93          {
  94              dx = 0;
  95              dy = 0;
  96          }
  97          // Position the tip, offset from the center by OFFSETX and OFFSETY
  98          x = (tt_GetClientW() - tt_w) / 2 + dx + tt_aV[OFFSETX];
  99          y = (tt_GetClientH() - tt_h) / 2 + dy + tt_aV[OFFSETY];
 100          tt_SetTipPos(x, y);
 101          return true;
 102      }
 103      return false;
 104  }