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This shows you the differences between two versions of the page.

--- sample_code:unit_convert [2014/11/01 12:45]
106.77.65.188 [Unit Converter]
+++ sample_code:unit_convert [2014/11/01 12:52]
106.77.65.188 [The code]
@@ Line 1: / Line 1: @@
-====== Unit Converter ======
+====== Converterlator ======
-Simplistic demo of how a unit-converter app could be built.Supports two quantities.
+Calculator+Converter app.
 ===== The code =====
 <code javascript unit_convert.js>
-var unitval = [];
+//variables for converter.
-unitval ["mm"] = 1;
+var unitval = [];
-unitval ["m"] = 1000;
+unitval ["mm"] = 1;
-unitval ["km"] =1000000;
+unitval ["cm"] = 10
+unitval ["m"] = 1000;
+unitval ["km"] =1000000;
+unitval ["g"] = 1;
+unitval ["pound"] = 453.59;
+unitval ["kg"] = 1000;
+//variables for calculator.
+var sum = "";
+var π = 3.14;
-//Called when application is started.
+//Called when application is started.
-function OnStart()
+function OnStart()
+{
+    //Create a main layout with objects vertically centered.
+    lay = app.CreateLayout( "linear", "FillXY" );
+    lay.SetBackColor( "#ff000000" );
+    //Create array to hold number buttons.
+    keys = [ 7,8,9,"/", 4,5,6,"*", 1,2,3,"-", 0,".","C","+","√","π", "=", "%" ];
+    //Create an about button.
+    abt = app.CreateButton( "About" );
+    abt.SetOnTouch( abt_OnTouch );
+    lay.AddChild( abt );
+    //Create a spinner for Background colour.
+    clrs = app.CreateSpinner( "Background Color-Black,Blue,Red,Yellow,Purple,Orange,White" );
+    clrs.SetOnTouch( clrs_OnTouch );
+    lay.AddChild( clrs );
+    //Create text control for displaying sum.
+    txtSum = app.CreateText( "", 1.0, 0.1 );
+    txtSum.SetTextSize( 42 );
+    txtSum.SetBackColor( "#ff222222" );
+    txtSum.SetMargins( 0, 0.05, 0, 0.05 );
+    lay.AddChild( txtSum );
+    //Create first row of buttons.
+    lay1st = app.CreateLayout( "linear", "Horizontal" );
+    for( i=0; i<4; i++ ) AddButton( lay1st, keys[i] );
+    lay.AddChild( lay1st );
+    //Create second row of buttons.
+    lay2nd = app.CreateLayout( "linear", "Horizontal" );
+    for( i=4; i<8; i++ ) AddButton( lay2nd, keys[i] );
+    lay.AddChild( lay2nd );
+    //Create third row of buttons.
+    lay3rd = app.CreateLayout( "linear", "Horizontal" );
+    for( i=8; i<12; i++ ) AddButton( lay3rd, keys[i] );
+    lay.AddChild( lay3rd );
+    //Create fourth row of buttons.
+    lay4th = app.CreateLayout( "linear", "Horizontal" );
+    for( i=12; i<16; i++ ) AddButton( lay4th, keys[i] );
+    lay.AddChild( lay4th );
+    //Create fifth row of buttons.
+    lay5th = app.CreateLayout( "linear", "Horizontal" );
+    for( i=16; i<20; i++ ) AddButton( lay5th, keys[i] );
+    lay.AddChild( lay5th );
+    //Create a converter button.
+    cnvrtr = app.CreateButton( "Converter", 0.4, 0.1 );
+    cnvrtr.SetOnTouch( cnvrtr_OnTouch );
+    cnvrtr.SetMargins( 0, 0.02, 0, 0 );
+    lay.AddChild( cnvrtr );
+    //Set Debug off for max performance.
+    app.SetDebugEnabled( false );
+    app.EnableBackKey( false );
+    //Add layout to app.
+    app.AddLayout( lay );
+}
+ function OnBack()
 {
-    //Create a horizontal layout.
+ var yesno = app.CreateYesNoDialog( "Exit Converlator?" );
-    lay = app.CreateLayout( "linear", "Horizontal,FillXY" );
+ yesno.SetOnTouch( yesno_OnTouch );
+}
+ function yesno_OnTouch( result )
+{
+ if( result == "Yes" ) app.Exit();
+}
+ function abt_OnTouch()
+{
+ //Create a dialog window.
+ dlg = app.CreateDialog( "About" );
-    edt = app.CreateTextEdit("100",0.23, -1, "Number");
+ //Create a layout for dialog.
-    edt.SetTextSize(12);
+ laydlg = app.CreateLayout( "linear" );
-    edt.SetOnChange(docalc);
+ dlg.AddLayout( laydlg );
-    spinfrom = app.CreateSpinner("Unit,mm,m,km",0.23);
-    spinfrom.SetOnTouch(docalc);
+ vrsn = app.CreateText( "Version : 1.0" );
-    spinto = app.CreateSpinner("Unit,mm,m,km",0.23);
+ vrsn.SetTextSize(24);
-    spinto.SetOnTouch(docalc);
+ vrsn.SetMargins( 0, 0, 0, 0.02 );
-    txt = app.CreateText( "????",0.23 );
+ laydlg.AddChild(vrsn);
-    txt.SetTextSize( 12 );
-    lay.AddChild(edt);
+ nm = app.CreateText( "Developer : Sankarshan Dudhate" );
-    lay.AddChild(spinfrom);
+ nm.SetTextSize(20);
-    lay.AddChild(spinto);
+ nm.SetPadding(0.05, 0, 0, 0 );
-    lay.AddChild( txt );
+ laydlg.AddChild(nm);
-    //Add layout to app.
+ dlg.Show();
-    app.AddLayout( lay );
 }
-function docalc(){
+ function clrs_OnTouch()
-  qty = edt.GetText();
+{
-  if(spinfrom.GetText() == "Unit" ||
+ if(clrs.GetText() == "Blue")
-     spinto.GetText() == "Unit" ||
+{
-     !isNumber(qty)){
+ lay.SetBackColor("#ff0000ff" );
-     txt.SetText("????")
+}
-     return;
+ else if( clrs.GetText() == "Red")
-  }
+{
-  var a = unitval[spinfrom.GetText()];
+ lay.SetBackColor("#ffff0000" );
-  var b = unitval[spinto.GetText()];
+}
-  var res = qty * a / b;
+ else if( clrs.GetText() == "Yellow" )
-  txt.SetText(res);
+{
+ lay.SetBackColor( "#ffffff00" );
+}
+ else if( clrs.GetText() == "Purple" )
+{
+ lay.SetBackColor( "#aa770077" );
+}
+else if( clrs.GetText() == "Orange" )
+{
+ lay.SetBackColor( "#ffff6700" );
+}
+ else if( clrs.GetText() == "White" )
+{
+ lay.SetBackColor( "#ffffffff" );
+}
+ else
+{
+ lay.SetBackColor( "#ff000000" );
+}
 }
-function isNumber(n) {
+//Add a button to a given layout.
-  return !isNaN(parseFloat(n)) && isFinite(n);
+function AddButton( lay, name )
+{
+    if( name=="=" ) w = 0.2; else w=0.2;
+    btn = app.CreateButton( name, w, 0.1, "Alum" );
+    btn.SetOnTouch( btns_OnTouch );
+    lay.AddChild( btn );
+}
+//Called when user presses number buttons.
+function btns_OnTouch()
+ {
+    app.Vibrate( "0,100" );
+    //Get button text.
+    btn = app.GetLastButton();
+    var txt = btn.GetText();
+    //Handle equals button.
+    if( txt=="=" ) CalcResult();
+    //Handle clear button.
+    else if( txt=="C" ) sum = "";
+    else if( txt=="√" )
+  {
+        sum = Math.sqrt( sum );
+  }
+    //Handle other buttons.
+    else sum += txt;
+    //Update display.
+    txtSum.SetText( sum );
+}
+//Calculate sum.
+function CalcResult()
+{
+    try{
+        //Evaluate sum (and catch errors).
+        sum = eval( sum ).toFixed(4);
+    }
+    catch(e) { sum = "Error" }
+}
+ function cnvrtr_OnTouch()
+{
+ //Hide the objects from calculator.
+ txtSum.SetVisibility( "Gone" );
+ lay1st.SetVisibility( "Gone" );
+ lay2nd.SetVisibility( "Gone" );
+ lay3rd.SetVisibility( "Gone" );
+ lay4th.SetVisibility( "Gone" );
+ lay5th.SetVisibility( "Gone" );
+ cnvrtr.SetVisibility( "Gone" );
+ //Create a spinner for quantities.
+ qnt = app.CreateSpinner( "Length,Mass", 0.4, 0.1 );
+ qnt.SetOnTouch( qnt_OnTouch );
+ qnt.SetMargins( 0, 0.05, 0, 0.02 );
+ lay.AddChild( qnt );
+ //Create 1st layout for unit and text edit.
+ lay1 = app.CreateLayout( "Linear", "Horizontal" );
+ lay.AddChild( lay1 );
+ //Create 2nd layout for unit and text edit.
+ lay2 = app.CreateLayout( "Linear", "Horizontal" );
+ lay.AddChild( lay2 );
+ /* We will set SetOnTouch callbacks of unt as well as edt
+ to be same because if anyone is edited, we should calculate
+ same result. So, instead of doing two different callbacks for
+ them, we will set same for both of them. */
+ //Create a spinner for 1st units.
+ unt1 = app.CreateSpinner( "mm,cm,m,km", 0.3, 0.1);
+ unt1.SetOnTouch( unt1_OnTouch );
+ lay1.AddChild( unt1 );
+ //Create text edit to take value.
+ edt1 = app.CreateTextEdit( "0", 0.7, 0.1 );
+ edt1.SetOnChange( unt1_OnTouch );
+ lay1.AddChild( edt1 );
+ //Create a spinner for 2nd units.
+ unt2 = app.CreateSpinner( "mm,cm,m,km", 0.3, 0.1 );
+ unt2.SetOnTouch( unt2_OnTouch );
+ lay2.AddChild( unt2 );
+ //Create text edit to take value.
+ edt2 = app.CreateTextEdit( "0", 0.7, 0.1 );
+ edt2.SetOnChange( unt2_OnTouch );
+ lay2.AddChild( edt2 );
+ //Create a calculator button.
+ clc = app.CreateButton( "Calculator", 0.4, 0.1 );
+ clc.SetOnTouch( clc_OnTouch );
+ clc.SetMargins( 0, 0.1, 0, 0 );
+ lay.AddChild( clc );
 }
+ function qnt_OnTouch()
+{
+ if( qnt.GetText() == "Mass" )
+{
+ unt1.SetList( "g,pound,kg" );
+ unt2.SetList( "g,pound,kg" );
+}
+}
+ function unt1_OnTouch()
+{
+ //Create variables to hold values of inputs.
+ var a = unitval[unt1.GetText()];
+ var b = unitval[unt2.GetText()];
+ qty = edt1.GetText();
+ res = qty*a/b;
+ edt2.SetText( res );
+}
+ function unt2_OnTouch()
+{
+ //Create variables to hold values of inputs.
+ var a = unitval[unt1.GetText()];
+ var b = unitval[unt2.GetText()];
+ qty = edt2.GetText();
+ res = qty*b/a;
+ edt1.SetText( res );
+}
+ function isNumber(n)
+{
+  return !isNaN(parseFloat(n)) && isFinite(n);
+}
+ function clc_OnTouch()
+{
+    //Hide the objects of converter.
+    qnt.SetVisibility( "Gone" );
+    lay1.SetVisibility( "Gone" );
+    lay2.SetVisibility( "Gone" );
+    clc.SetVisibility( "Gone" );
+    //Create text control for displaying sum.
+    txtSum = app.CreateText( "", 1.0, 0.1 );
+    txtSum.SetTextSize( 42 );
+    txtSum.SetBackColor( "#ff222222" );
+    txtSum.SetMargins( 0, 0.05, 0, 0.05 );
+    lay.AddChild( txtSum );
+    //Create first row of buttons.
+    lay1st = app.CreateLayout( "linear", "Horizontal" );
+    for( i=0; i<4; i++ ) AddButton( lay1st, keys[i] );
+    lay.AddChild( lay1st );
+    //Create second row of buttons.
+    lay2nd = app.CreateLayout( "linear", "Horizontal" );
+    for( i=4; i<8; i++ ) AddButton( lay2nd, keys[i] );
+    lay.AddChild( lay2nd );
+    //Create third row of buttons.
+    lay3rd = app.CreateLayout( "linear", "Horizontal" );
+    for( i=8; i<12; i++ ) AddButton( lay3rd, keys[i] );
+    lay.AddChild( lay3rd );
+    //Create fourth row of buttons.
+    lay4th = app.CreateLayout( "linear", "Horizontal" );
+    for( i=12; i<16; i++ ) AddButton( lay4th, keys[i] );
+    lay.AddChild( lay4th );
+    //Create fifth row of buttons.
+    lay5th = app.CreateLayout( "linear", "Horizontal" );
+    for( i=16; i<20; i++ ) AddButton( lay5th, keys[i] );
+    lay.AddChild( lay5th );
+    //Create a converter button.
+    cnvrtr = app.CreateButton( "Converter", 0.4, 0.1 );
+    cnvrtr.SetOnTouch( cnvrtr_OnTouch );
+    cnvrtr.SetMargins( 0, 0.02, 0, 0 );
+    lay.AddChild( cnvrtr );
+}
 </code>
 ===== Note =====

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