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web/js/tooltip/tip_centerwindow.js

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+/*
+tip_centerwindow.js  v. 1.2
+
+The latest version is available at
+http://www.walterzorn.com
+or http://www.devira.com
+or http://www.walterzorn.de
+
+Initial author: Walter Zorn
+Last modified: 23.6.2007
+
+Extension for the tooltip library wz_tooltip.js.
+Centers a sticky tooltip in the window's visible clientarea,
+optionally even if the window is being scrolled or resized.
+*/
+
+// Here we define new global configuration variable(s) (as members of the
+// predefined "config." class).
+// From each of these config variables, wz_tooltip.js will automatically derive
+// a command which can be passed to Tip() or TagToTip() in order to customize
+// tooltips individually. These command names are just the config variable
+// name(s) translated to uppercase,
+// e.g. from config. CenterWindow a command CENTERWINDOW will automatically be
+// created.
+
+//===================  GLOBAL TOOPTIP CONFIGURATION  =========================//
+config. CenterWindow = false	// true or false - set to true if you want this to be the default behaviour
+config. CenterAlways = false	// true or false - recenter if window is resized or scrolled
+//=======  END OF TOOLTIP CONFIG, DO NOT CHANGE ANYTHING BELOW  ==============//
+
+
+// Create a new tt_Extension object (make sure that the name of that object,
+// here ctrwnd, is unique amongst the extensions available for
+// wz_tooltips.js):
+var ctrwnd = new tt_Extension();
+
+// Implement extension eventhandlers on which our extension should react
+ctrwnd.OnLoadConfig = function()
+{
+	if(tt_aV[CENTERWINDOW])
+	{
+		// Permit CENTERWINDOW only if the tooltip is sticky
+		if(tt_aV[STICKY])
+		{
+			if(tt_aV[CENTERALWAYS])
+			{
+				// IE doesn't support style.position "fixed"
+				if(tt_ie)
+					tt_AddEvtFnc(window, "scroll", Ctrwnd_DoCenter);
+				else
+					tt_aElt[0].style.position = "fixed";
+				tt_AddEvtFnc(window, "resize", Ctrwnd_DoCenter);
+			}
+			return true;
+		}
+		tt_aV[CENTERWINDOW] = false;
+	}
+	return false;
+};
+// We react on the first OnMouseMove event to center the tip on that occasion
+ctrwnd.OnMoveBefore = Ctrwnd_DoCenter;
+ctrwnd.OnKill = function()
+{
+	if(tt_aV[CENTERWINDOW] && tt_aV[CENTERALWAYS])
+	{
+		tt_RemEvtFnc(window, "resize", Ctrwnd_DoCenter);
+		if(tt_ie)
+			tt_RemEvtFnc(window, "scroll", Ctrwnd_DoCenter);
+		else
+			tt_aElt[0].style.position = "absolute";
+	}
+	return false;
+};
+// Helper function
+function Ctrwnd_DoCenter()
+{
+	if(tt_aV[CENTERWINDOW])
+	{
+		var x, y, dx, dy;
+
+		// Here we use some functions and variables (tt_w, tt_h) which the
+		// extension API of wz_tooltip.js provides for us
+		if(tt_ie || !tt_aV[CENTERALWAYS])
+		{
+			dx = tt_GetScrollX();
+			dy = tt_GetScrollY();
+		}
+		else
+		{
+			dx = 0;
+			dy = 0;
+		}
+		// Position the tip, offset from the center by OFFSETX and OFFSETY
+		x = (tt_GetClientW() - tt_w) / 2 + dx + tt_aV[OFFSETX];
+		y = (tt_GetClientH() - tt_h) / 2 + dy + tt_aV[OFFSETY];
+		tt_SetTipPos(x, y);
+		return true;
+	}
+	return false;
+}