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--- sample_code:layout_children [2014/12/01 06:32]
stevegarman
+++ sample_code:layout_children [2014/12/29 02:20]
@@ Line 1: / Line 1: @@
-====== Layout Children ======
-DroidScript's [[built_in:layouts|Layout]] comes complete with methods ChildToFront and GetChildOrder but some people seem to think it is missing a couple of methods, so I offer these functions in the hopr that they may be useful.
-===== ChildToBack =====
-<code javascript childToBack.js>
-function childToBack(layt, obj){
-  if( layt.GetChildOrder( obj ) > 0 ){
-    layt.RemoveChild(obj);
-    layt.AddChild(obj,0);
-  }
-}
-</code>
-===== setChildOrder =====
-<code javascript setChildOrder.js>
-function setChildOrder(layt, obj, order){
-  var tst = layt.GetChildOrder( obj );
-  if ((tst >= 0) && (tst != order)){
-    layt.RemoveChild(obj);
-    layt.AddChild(obj,order);
-  }
-}
-</code>
-===== getChildren =====
-<code javascript getChildren.js>
-function getChildren(layt){
-  //takes a layout as an argument
-  var children = [];
-  var obj, order;
-  //loop through all controls
-  for (var id in _map) {
-    obj = _map[id]
-    //check if control is on our layout
-    order = layt.GetChildOrder( obj );
-    if( order > -1 ) {
-      //got one!
-      //zorder propery wll persist until getChildren called again
-      //or manually overwritten by coder
-      obj.zorder = order;
-      children.push( obj );
-    }
-  }
-  children.sort(function (a, b) { return a.zorder - b.zorder});
-  return children;
-}
-</code>
-===== Sample app =====
-This sample shows how to use the childToBack function
-<code javascript toback.js>
-//Called when application is started.
-function OnStart()
-{
-    app.SetOrientation("Portrait");
-    //Create a layout with objects vertically centered.
-    lay = app.CreateLayout( "Linear", "VCenter,FillXY" );
-    //Create an absolute layout so we can position objects.
-    layAbs = app.CreateLayout( "Absolute" );
-    lay.AddChild( layAbs );
-    //Create first image.
-    img1 = app.CreateImage( null, 0.5, 0.3 );
-    img1.SetColor("#66000088");
-    img1.SetOnTouchDown(img_OnTouch);
-    layAbs.AddChild( img1 );
-    //Create second image.
-    img2 = app.CreateImage( null, 0.5, 0.3 );
-    img2.SetColor("#66880000");
-    img2.SetPosition( 0.1,0.1 );
-    img2.SetOnTouchDown(img_OnTouch);
-    layAbs.AddChild( img2  );
-    //Create third image in middle
-    img3 = app.CreateImage( null, 0.5, 0.3 );
-    img3.SetColor("#66008800");
-    img3.SetPosition( 0.2,0.2 );
-    img3.SetOnTouchDown(img_OnTouch);
-    layAbs.AddChild( img3,1 );
-    //Add layout to app.
-    app.AddLayout( lay );
-}
-//Called when user touches image
-function img_OnTouch(){
-  childToBack(layAbs, this)
-}
-function childToBack(layt, obj){
-  if( layt.GetChildOrder( obj ) > 0 ){
-    layt.RemoveChild(obj);
-    layt.AddChild(obj,0);
-  }
-}
-</code>

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