LAMW UI questions
lazarus / 43-Android

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CC · 2017-09-25 14:02

Hi,

1. I need to change its  color when a button is clicked to mimic
grouped button behaviour  (always only one is selected). Trying to
change the color  within the eventhandler crashes  the app.  Is there
a way to do  this properly?

2. Z Order has no effect. Is there a way to insure that a  control
appears on  top of an other when overlapped.

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RAW · 2017-09-25 15:11

1) How does the unproperly way look like?
    OS ? LAZ version ?

2) What's wrong with Code: Pascal  [Select][+][-]window.onload =
function(){var x1 = document.getElementById("main_content_section");
if (x1) { var x = document.getElementsByClassName("geshi");for (var i
= 0; i Control.BringToFront;

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Thaddy · 2017-09-25 16:52

Note you may not be able to change the color on every widgetset for
TButton: e.g. on windows that is not possible.

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CC · 2017-09-25 16:53

I forgot to mention a very important piece of information : I am using
LAMW. 

QuoteHow does the unproperly way look like?
Trying to change the color  within the on click event handler crashes 
the app.  The process of handling a click involves some UI updates
after the event handler code is executed. So I assumed  that changing
a  property value it uses  caused the crash.  Maybe my code needs to
be wrapped between some kind of  "Begin update" and  "End update" 
calls.

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jmpessoa · 2017-09-25 18:21

QuoteI forgot to mention a very important piece of information : I am
using LAMW. 

Please, add "LAMW:" in your subject ...

Ok. I will try some solution!

Thank you!

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jmpessoa · 2017-09-26 23:50

Hi, CC

This work:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i procedure
TAndroidModule1.jButton1Click(Sender: TObject);begin 
jButton1.Enabled:= False;end; procedure
TAndroidModule1.jButton2Click(Sender: TObject);begin 
jButton1.Enabled:= True;end; 
and this, too:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i procedure
TAndroidModule1.jButton1AfterDispatchDraw(Sender: TObject; canvas:
JObject; tag: integer);begin  if jButton1.Enabled = False then   
 jButton1.BackgroundColor:= colbrYellow  else   
jButton1.BackgroundColor:= colbrRed;end; 
NOTE:
Fixed jButton Enable property in design time....

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CC · 2017-10-22 12:06

jmpessoa,

I have just realized, that for some reason my "Thank you" comment  did
not make into the topic earlier. So once again:

Thank you for creating LAMW and for your quick response.

Your solution works. There is small time-lag though, so I ended up
putting every button into its own panel and coloring the parent
instead. There is no delay this way.