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/*
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tip_centerwindow.js v. 1.21
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The latest version is available at
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http://www.walterzorn.com
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or http://www.devira.com
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or http://www.walterzorn.de
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Initial author: Walter Zorn
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Last modified: 3.6.2008
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Extension for the tooltip library wz_tooltip.js.
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Centers a sticky tooltip in the window's visible clientarea,
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optionally even if the window is being scrolled or resized.
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*/
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// Make sure that the core file wz_tooltip.js is included first
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if(typeof config == "undefined")
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alert("Error:\nThe core tooltip script file 'wz_tooltip.js' must be included first, before the plugin files!");
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// Here we define new global configuration variable(s) (as members of the
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// predefined "config." class).
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// From each of these config variables, wz_tooltip.js will automatically derive
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// a command which can be passed to Tip() or TagToTip() in order to customize
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// tooltips individually. These command names are just the config variable
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// name(s) translated to uppercase,
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// e.g. from config. CenterWindow a command CENTERWINDOW will automatically be
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// created.
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//=================== GLOBAL TOOLTIP CONFIGURATION =========================//
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config. CenterWindow = false // true or false - set to true if you want this to be the default behaviour
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config. CenterAlways = false // true or false - recenter if window is resized or scrolled
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//======= END OF TOOLTIP CONFIG, DO NOT CHANGE ANYTHING BELOW ==============//
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// Create a new tt_Extension object (make sure that the name of that object,
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// here ctrwnd, is unique amongst the extensions available for
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// wz_tooltips.js):
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var ctrwnd = new tt_Extension();
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// Implement extension eventhandlers on which our extension should react
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ctrwnd.OnLoadConfig = function()
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{
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if(tt_aV[CENTERWINDOW])
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{
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// Permit CENTERWINDOW only if the tooltip is sticky
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if(tt_aV[STICKY])
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{
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if(tt_aV[CENTERALWAYS])
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{
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// IE doesn't support style.position "fixed"
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if(tt_ie)
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tt_AddEvtFnc(window, "scroll", Ctrwnd_DoCenter);
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else
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tt_aElt[0].style.position = "fixed";
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tt_AddEvtFnc(window, "resize", Ctrwnd_DoCenter);
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}
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return true;
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}
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tt_aV[CENTERWINDOW] = false;
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}
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return false;
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};
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// We react on the first OnMouseMove event to center the tip on that occasion
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ctrwnd.OnMoveBefore = Ctrwnd_DoCenter;
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ctrwnd.OnKill = function()
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{
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if(tt_aV[CENTERWINDOW] && tt_aV[CENTERALWAYS])
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{
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tt_RemEvtFnc(window, "resize", Ctrwnd_DoCenter);
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if(tt_ie)
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tt_RemEvtFnc(window, "scroll", Ctrwnd_DoCenter);
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else
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tt_aElt[0].style.position = "absolute";
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}
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return false;
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};
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// Helper function
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function Ctrwnd_DoCenter()
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{
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if(tt_aV[CENTERWINDOW])
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{
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var x, y, dx, dy;
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// Here we use some functions and variables (tt_w, tt_h) which the
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// extension API of wz_tooltip.js provides for us
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if(tt_ie || !tt_aV[CENTERALWAYS])
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{
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dx = tt_GetScrollX();
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dy = tt_GetScrollY();
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}
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else
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{
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dx = 0;
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dy = 0;
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}
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// Position the tip, offset from the center by OFFSETX and OFFSETY
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x = (tt_GetClientW() - tt_w) / 2 + dx + tt_aV[OFFSETX];
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y = (tt_GetClientH() - tt_h) / 2 + dy + tt_aV[OFFSETY];
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tt_SetTipPos(x, y);
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return true;
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}
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return false;
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}
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