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MemPool-Module/mempool.js /

Nikhil Patched parseMemory function to return mem value directly when on iOS
Latest commit c2c44f3 on Jan 19, 2013
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1 contributor
131 lines (109 sloc) 3.31 KB

/*
MemPool Module for Appcelerator Titanium
About:
Created by Raul Riera, http://raulriera.com
Code taken from https://github.com/pec1985/Single-Context and modified
*/

(function(){

MemoryPool = function() {
    var _window;
    /*
     Here we make our "auto-release" pool. It's simply a window.
     We hide it upon creation so it won't interfere with our view hierarchy.
 
     5/3/2011: It seems that the window does not need to be a subcontext, just a regular window will do.
     */
    this.init = function() {
        _window = Ti.UI.createWindow();
        _window.hide();
        _window.open();
    }
    // This is where we clear out the memPool by closing it then reopening it again.
    this.clean = function(obj) {
        if(obj instanceof Array) {
            var arLen=obj.length;
            for ( var i=0, len=arLen; i<len; ++i ) {
                // We then stick the entire view into the pool
                _window.add(obj[i]);
            }
        } else {
            // We then stick the entire view into the pool
            _window.add(obj);
        }
        Ti.API.info('Cleaning MemoryPool.');
 
        // We empty the pool by closing it.
        _window.close();
 
        // We recreate the window again for the next object
        this.init();
    };
    
    // This displays a message with the current memory usage
    this.showMemoryUsage = function(){
	
		var screenWidth = Ti.Platform.displayCaps.platformWidth;
	
		var messageWin = Ti.UI.createWindow({
			height: 30,
			width: screenWidth,
			top: 0,
			touchEnabled: false
		});
		var messageView = Ti.UI.createView({
			id:'messageview',
			height: 30,
			width: screenWidth,
			backgroundColor: '#fff',
			opacity: 0.7,
			touchEnabled: false
		});

		var messageLabel = Ti.UI.createLabel({
			id: 'messagelabel',
			text: '',
			color: '#000',
			width: screenWidth,
			height: 'auto',
			font:{
				fontFamily: 'Helvetica Neue',
				fontSize: 13
			},
			textAlign: 'center'
		});
	
		// Converts the memory from bytes to kilobytes or megabytes
		var parseMemory = function(mem){
			if(Ti.Platform.osname == 'iphone' || Ti.Platform.osname == 'ipad') {
				//on iOS, memory is already defined in MBs
				return mem.toFixed(2) + " mb"; 
			}
			
			// bytes to kilobytes
			var kb = mem / 1024;
			// bytes to megabytes
			var mb = kb / 1024;
			
			if (mb > 1) {
				mem = mb.toFixed(2) + " mb";
			} else if (kb > 1) {
				mem = kb.toFixed(2) + " kb";
			} else {
				mem = mem.toFixed(2) + " bytes";
			}
			return mem;
		};
	
		messageWin.add(messageView);
		messageWin.add(messageLabel);
	
		// this app event will show the message
		Ti.App.addEventListener('showMemoryDisplay', function(){
			setInterval(function(){
				var memory = Ti.Platform.availableMemory;
				
				// Parse this number into something usable and display it back
				messageLabel.text = parseMemory(memory);
			}, 2000);
			messageWin.open();	
		});
		// this app event will hide the message
		Ti.App.addEventListener('hideMemoryDisplay', function(){
			messageWin.close();
		});
		
		Ti.App.fireEvent('showMemoryDisplay');
	};

	// this hides the message with the memory usage
	this.hideMemoryUsage = function(){
		Ti.App.fireEvent('hideMemoryDisplay');
	};
    
    this.init();
}

})();
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