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web/js/tooltip/tip_followscroll.js

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+/*
+tip_followscroll.js	v. 1.1
+
+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: 21.6.2007
+
+Extension for the tooltip library wz_tooltip.js.
+Lets a "sticky" tooltip keep its position inside the clientarea if the window
+is scrolled.
+*/
+
+// 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. FollowScroll a command FOLLOWSCROLL will automatically be
+// created.
+
+//===================	GLOBAL TOOPTIP CONFIGURATION	======================//
+config. FollowScroll = false		// true or false - set to true if you want this to be the default behaviour
+//=======	END OF TOOLTIP CONFIG, DO NOT CHANGE ANYTHING BELOW	==============//
+
+
+// Create a new tt_Extension object (make sure that the name of that object,
+// here fscrl, is unique amongst the extensions available for
+// wz_tooltips.js):
+var fscrl = new tt_Extension();
+
+// Implement extension eventhandlers on which our extension should react
+fscrl.OnShow = function()
+{
+	if(tt_aV[FOLLOWSCROLL])
+	{
+		// Permit FOLLOWSCROLL only if the tooltip is sticky
+		if(tt_aV[STICKY])
+		{
+			var x = tt_x - tt_GetScrollX(), y = tt_y - tt_GetScrollY();
+
+			if(tt_ie)
+			{
+				fscrl.MoveOnScrl.offX = x;
+				fscrl.MoveOnScrl.offY = y;
+				fscrl.AddRemEvtFncs(tt_AddEvtFnc);
+			}
+			else
+			{
+				tt_SetTipPos(x, y);
+				tt_aElt[0].style.position = "fixed";
+			}
+			return true;
+		}
+		tt_aV[FOLLOWSCROLL] = false;
+	}
+	return false;
+};
+fscrl.OnHide = function()
+{
+	if(tt_aV[FOLLOWSCROLL])
+	{
+		if(tt_ie)
+			fscrl.AddRemEvtFncs(tt_RemEvtFnc);
+		else
+			tt_aElt[0].style.position = "absolute";
+	}
+};
+// Helper functions (encapsulate in the class to avoid conflicts with other
+// extensions)
+fscrl.MoveOnScrl = function()
+{
+	tt_SetTipPos(fscrl.MoveOnScrl.offX + tt_GetScrollX(), fscrl.MoveOnScrl.offY + tt_GetScrollY());
+};
+fscrl.AddRemEvtFncs = function(PAddRem)
+{
+	PAddRem(window, "resize", fscrl.MoveOnScrl);
+	PAddRem(window, "scroll", fscrl.MoveOnScrl);
+};
+