python - Linking main.py with .kv file -


i trying label has text of string stored in w variable in main.py file , label in .kv file let me show both files.

here's main.py file

from kivy.app import app kivy.properties import stringproperty  class exampleapp(app):       def hell(self):         w="hello world"     def build(self):         self.load_kv("exapmleapp.kv")  if __name__ == "__main__":     exampleapp().run()

and here .kv file.

label:     text:app.w

every time when run main.py file, gives me error.

1: 2:label: 3: text:app.w ... attributeerror: 'exampleapp' object has no attribute 'w' file "/usr/local/lib/python2.7/dist-packages/kivy/lang.py", line 1649, in create_handler return eval(value, idmap) file "./exampleapp.kv", line 3, in text:app.w file "/usr/local/lib/python2.7/dist-packages/kivy/lang.py", line 858, in getattribute return getattr(object.getattribute(self, '_obj'), name) file "/usr/local/lib/python2.7/dist-packages/kivy/lang.py", line 2011, in _apply_rule value, rule, rctx['ids']) file "/usr/local/lib/python2.7/dist-packages/kivy/lang.py", line 1654, in create_handler cause=tb)

how can label has text stored in w variable in main.py file

i don't think .kv file can see attributes inside function calling. can see in example below, i've moved 'w' attribute outside function.

edit: aah seems want change displayed label when function hell() called. firstly need easy way refer label. kivy uses id tag, , list of ids can found in self.ids

having 'w' variable no longer necessary, i've left in there answer original question.

so, should work in theory:

from kivy.app import app kivy.properties import stringproperty  class exampleapp(app):     w = "hello"   def hell(self):     self.ids.mylabel.text = "world"   def build(self):     self.load_kv("exapmleapp.kv")  if __name__ == "__main__":   exampleapp().run()

and .kv file:

label:   id: mylabel   text:app.w

Comments

Post a Comment

Popular posts from this blog

javascript - Using jquery append to add option values into a select element not working -

i'm looking dynamically populate select element names of items stored array. for reason it's not working , i'm not sure why. html: <div class="col-md-4 col-md-offset-4"> <select class="select1"> </select> , <select class="select2"> </select> </div> note i'm using bootstrap layout. here's jquery i'm using try , populate ".select1" jquery: select: function() { $.each(state.greens, function(index, value) { $(".select1").append("<option value =' " + index + " '>" + state.greens[index].name + "</option>"); }); } note function 'select' stored within object called 'display'. state.greens name of array i'm trying access. so @ end of html page call display.select(); call function. no error messages showing in console. also, saw question: appending
Read more

Android soft keyboard reverts to default keyboard on orientation change -

i'm building android soft keyboard , can't seem fix bug - have arabic , qwerty keyboard , when rotate device on qwerty keyboard (or arabic shift), it's if program has "restarted" , becomes arabic keyboard without shift. the onsaveinstancestate(bundle savedinstancestate) not work because application not extend activity inputmethodservice . i put following in android manifest android:configchanges="keyboard|keyboardhidden|orientation" android:windowsoftinputmode="stateunchanged|adjustresize"> i tried using @override public void onconfigurationchanged(configuration newconfig) { super.onconfigurationchanged(newconfig); log.i(mydebug, "config changed " + currentkeyboard.equals(qwerty)); } however, currentkeyboard.equals(qwerty)) results false , made sure true before orientation change. any appreciated. i think applications fault. if application restarting on orientation change
Read more

Rendering JButton to get the JCheckBox behavior in a JTable by using images does not update my table -

i rendering jbutton image on simulate jcheckbox behavior. why don't let jtable render jcheckbox? because need bigger checkboxes , there's no way can resize them (as far know). so, have own table cell renderer , editor. both renders jbutton , checkbox images on them. trying change image checked image unchecked image (or vice versa) , update cell value (boolean true or false). however, reason, getcelleditorvalue() not update table. so, release mouse, value goes original one. any appreciated! lot! public class tableexample extends jframe { jscrollpane pane; jpanel panel; jtable table; object[][] data; mytablemodel tm; renderer buttoncolumn; public tableexample(object[][] data) throws ioexception { string[] columns = {"column#1", "column#2", "column#3", "column#4", "column#5", "column#6"}; this.data = data; this.setpreferredsize(new dimension(700, 500));
Read more