ToggleCover.js

////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 * @title : ToggleCover
 * @description : Acrobat script to toggle easily between different views, with or without the cover page, in the frontmost PDF.
 * @author : Tobias Wantzen <kontakt@wantzen.com>
 * @date : 2017-03-17
 * @version : v01
 * @todo : 
 */
////////////////////////////////////////////////////////////////////////////////////////////////////////////
// 
//  GENERAL INSTALLATION INSTRUCTIONS:
//
//  This Acrobat Automation Script will only work when 
//  placed in one of the Acrobat JavaScript Folders. Execute
//  the following code from the Acrobat JavaScript Console to find
//  the location of the JavaScript folders. 
//
//  To display the Acrobat JavaScript Console use Ctrl+J on 
//  Windows and Command+J on the Mac, does not work properly on newer Mac Books
//
//      app.getPath("app","javascript");
//
//      app.getPath("user");
//      [You may have to add a folder called "JavaScripts" to this folder manually.]
//
//  You may place this script file in either one of the folders.
//  However, the "user" folder is shared by both Acrobat and Reader
//  Placing the file in the user folder will make the menu item 
//  availible to both Acrobat and Reader
//

// localization
var _lang = app.language;
//



///////
// Logic
//
var twaToggleCover = app.trustedFunction( function() {
   app.beginPriv();
	var _doc = this;
	_doc.zoomType = zoomtype.fitP;
	if ( _doc.layout == "TwoPageRight" ) {
		_doc.layout = "TwoPageLeft";
	} else if ( _doc.layout == "TwoPageLeft" ) {
		_doc.layout = "SinglePage";
	} else {
		_doc.layout = "TwoPageRight";
	}
   app.endPriv();
});


///////
//  User Interface: menu items (View menu)
//
// localization
var twa_addMenuItem_ToggleCover_cUser = { ENU: "Two page view: &Toggle Cover Page View", DEU: "Zweiseitenansicht: &Deckblatt umschalten" };
//
app.addMenuItem({
	cName:"twaToggleCoverMen", 
	cUser:twa_addMenuItem_ToggleCover_cUser[_lang],
	cParent:"View", 
//    nPos:"Rotate", 
	nPos:"PageLayout", 
	bPrepend:true,
	cExec:"twaToggleCover()", 
	cEnable:"event.rc = app.doc != null"
});


///////
//  User Interface: buttons in toolbar
//
// localization
var twa_addToolButton_ToggleCover_cTooltext = { ENU: "Toggles the cover page on or off in two page layout.", DEU: "Schaltet das Deckblatt in der Zweiseitenansicht an oder aus." };
var twa_addToolButton_ToggleCover_cLabel = { ENU: "Toggle Cover Page View", DEU: "Deckblatt-Ansicht umschalten" };
//
var strDataToggleCover = "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";
var oIconToggleCover = null;
oIconToggleCover = {count: 0, width: 20, height: 20, read: function(nBytes){return strDataToggleCover.slice(this.count, this.count += nBytes);}};
try { app.removeToolButton("twaToggleCoverBtn"); } catch(e) {}
try {
    app.addToolButton({
		cName: "twaToggleCoverBtn",
		cExec: "twaToggleCover()",
		cEnable: "event.rc = (app.doc != null)",
		cMarked: "event.rc = false",
		cTooltext: twa_addToolButton_ToggleCover_cTooltext[_lang],
		oIcon: oIconToggleCover,
		nPos: 1,
		cLabel: twa_addToolButton_ToggleCover_cLabel[_lang]
	});
} catch(e) {}