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--- sample_code:datediff [2016/07/23 08:17]
stevegarman tidy
+++ sample_code:datediff [2016/07/29 13:39]
@@ Line 1: / Line 1: @@
-====== Date Difference demo ======
-This demo uses the UIExtras plugin, which is not free.
-You can buy it outright or you can use it for free if you have a Premium subscription.
-===== What can I learn from this sample? =====
-The main subjects explored in this demo are
-  * Changing layout when the screen rotates
-  * Calculating the difference between two dates in years, months and days.
-===== What if I don't have the plugin? =====
-Of course you could always buy it or take out a Premium subscription.
-Alternatively, you can study the code and pick out any bits you want.
-Or you can remove the UIExtras stuff and replace it with your own controls (TextEdits?) to allow the user to input a date.
-===== The code =====
-<code JavaScript dateDiff.js>
-// DroidScript
-// needs UIExtras plugin to run without modification
-//
-// tries to handle screen rotation helpfully
-// by placing controls vertically or horizontally
-// as appropriate. This does not rely on the plugin
-// the dateDiff function does not rely on the plugin
-app.LoadPlugin( "UIExtras" );
-var date1,date2;
-var picker,picker2,lay,txt,txt2,mth={};;
-function OnStart()
-{
- setMth(mth);
- var orient = app.GetOrientation()=="Landscape"?"Horizontal":"Verical";
- lay = app.CreateLayout( "Linear", orient+",FillXY" );
- var lay1 = app.CreateLayout( "Linear", "" );
- var lay2 = app.CreateLayout( "Linear", "" );
- lay.AddChild( lay1 );
- lay.AddChild( lay2 );
- if(app.GetOrientation=="Landscape")
-     lay.SetOrientation( "Horizontal" );
- var uix = app.CreateUIExtras();
- picker = uix.CreateDatePicker();
- picker.SetOnDateChanged( OnDateChanged );
- lay1.AddChild( picker );
- txt= app.CreateText( "",-1,-1,"autoscale" );
- txt.SetTextSize( 32 );
- txt.SetOnTouchUp( txt_OnTouch );
- lay1.AddChild( txt );
- picker2 = uix.CreateDatePicker();
- picker2.SetOnDateChanged( OnDate2Changed );
- lay2.AddChild( picker2 );
- txt2= app.CreateText( "",-1,-1,"autoscale" );
- txt2.SetTextSize( 32 );
- lay2.AddChild( txt2 );
- app.AddLayout( lay );
- init()
-}
-function txt_OnTouch()
-{
-	if(confirm("Reset dates?")) init();
-}
-function init()
-{
- var date = new Date();
- date1 = new Date(date.getFullYear(),date.getMonth(),date.getDate());
- //date2 = new Date(date.getFullYear(),date.getMonth(),(date.getDate()+7));
- date2 = new Date(2019, mth.jan, 1);
- picker.SetDate(date1);
- picker2.SetDate(date2);
- showDiff();
-}
-function OnDateChanged( year, month, day )
-{
- date1 = new Date( year, month, day);
- showDiff();
-}
-function OnDate2Changed( year, month, day )
-{
- date2 = new Date( year, month, day);
- showDiff();
-}
-// something changed, update text.
-function showDiff()
-{
-  var d = 1000*3600*24;
-	var diff = Math.round((date2.getTime() - date1.getTime())/d);
-	txt.SetText( diff + " days" );
-	txt.SetTextSize( 32 ); // may have been undone by autoscale
-	var diffObj = dateDiff(date1,date2);
-	var s = diffObj.sign;
-	if(diffObj.years > 0) s += diffObj.years+" years, "
-	if(diffObj.months > 0) s += diffObj.months+" months, "
-	s += diffObj.days+" days"
-	txt2.SetText( s );
-	txt2.SetTextSize( 32 );// may have been undone by autoscale
-}
-// lazy way to choose month when using Date object
-function setMth(m)
-{
-	m.jan=0;
-	m.feb=1;
-	m.mar=2;
-	m.apr=3;
-	m.may=4;
-	m.jun=5;
-	m.jul=6;
-	m.aug=7;
-	m.sep=8;
-	m.oct=9;
-	m.nov=10;
-	m.dec=11;
-}
-// screen orientation has probably changed
-function OnConfig()
-{
-	 if(app.GetOrientation()=="Landscape")
-      lay.SetOrientation( "Horizontal" );
-  else lay.SetOrientation( "Vertical" );
-  //let autoscale do its job again
-  txt.SetTextSize( 32 );
-  txt2.SetTextSize( 32 );
-}
-// calculate the absolute difference in days, months and years between 2 days
-//ignoring any time component
-function dateDiff(dt1, dt2)
-{
-    // setup return object
-    var ret = {days:0, months:0, years:0,sign:""};
-    // if same date, nothing to do
-    if (dt1 == dt2) return ret;
-    // we will do absolute diff and set the sign
-    if (dt1 > dt2)
-    {
-        var dtmp = dt2;
-        dt2 = dt1;
-        dt1 = dtmp;
-        ret.sign = "-";
-    }
-    // populate variables for comparison
-    var year1 = dt1.getFullYear();
-    var year2 = dt2.getFullYear();
-    var month1 = dt1.getMonth();
-    var month2 = dt2.getMonth();
-    var day1 = dt1.getDate();
-    var day2 = dt2.getDate();
-    // calculate differences
-    ret['years'] = year2 - year1;
-    ret['months'] = month2 - month1;
-    ret['days'] = day2 - day1;
-    // cope with any negative values.
-    if (ret['days'] < 0)
-    {
-        // can't span months by arithmetic, use temp date
-        var dtmp = new Date(dt1.getFullYear(), dt1.getMonth() + 1, 1, 0, 0, -1);
-        var numDays = dtmp.getDate();
-        ret['months'] -= 1;
-        ret['days'] += numDays;
-    }
-    // months is pure arithmetic
-    if (ret['months'] < 0)
-    {
-        ret['months'] += 12;
-        ret['years'] -= 1;
-    }
-    return ret;
-}
-</code>

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