According to apple documentation calling visibleMapRect should return an instance of MKMapRect but I am getting a MKCoordinateRegion instead.
class MyMapController < UIViewController
def loadView
super
self.view = MKMapView.alloc.init
view.delegate = self
end
def viewDidLoad
region = MKCoordinateRegionMake(
CLLocationCoordinate2D.new(20.7103500366211, -101.607849121094),
MKCoordinateSpanMake(18, 18)
)
view.setRegion region, animated: false
end
def mapView map, regionDidChangeAnimated: animated
puts map.visibleMapRect.inspect
# prints => <MKCoordinateRegion center=#<CLLocationCoordinate2D latitude=47967664.0 longitude=106401408.0> span=#<MKCoordinateSpan latitudeDelta=20971520.0 longitudeDelta=24051712.0>>
end
end
Apparently it is a bug in RubyMotion:
Hi,
It is possible that this is a compiler bug. Both structures may have
the same signature (same field types) therefore the compiler gets
confused. We will investigate this for an upcoming software update.
Regards. Laurent
Related
I am trying to Check Tree items from a function after the Tree is initialized. Check marks never appear. I'm not sure if I need to 'refresh' the Tree or that I am not interacting with the right object.
I've read about this widget a lot and I see the same question more or less on several websites but the answers are 8+ years old, two pages of code or I just don't understand them.
What am I doing wrong here? Why are there no check marks showing up in the tree when I call checkActiveTreeItems()?
After a REST call, I want to update the checked items in the tree. This seems to be ok but the items never get checked.
def checkActiveTreeItems(self):
for label in self.transactie['transactie']['labels']:
test = QtWidgets.QTreeWidgetItem([label])
test.setCheckState(0, QtCore.Qt.Checked)
This is the function that creates the tree, I do not call it again after setting the QTreeWidgetItem to Checked in the function above.
def initTree(self):
print("initTree")
self.treeWidget = QtWidgets.QTreeWidget(self.gridLayoutWidget)
self.treeWidget.setSelectionMode(QtWidgets.QAbstractItemView.ContiguousSelection)
self.treeWidget.setObjectName("treeWidget")
inkomstenstructuur = requests.get(url="http://localhost:32769/_db/piekenpijp/incoming/inkomstenstructuur")
iscontent = json.loads(inkomstenstructuur.content)
self.inkomsten = iscontent
inkomstentree = QtWidgets.QTreeWidgetItem(["Inkomsten"])
for groep in iscontent:
child = QtWidgets.QTreeWidgetItem([groep['groep']])
inkomstentree.addChild(child)
for categorie in groep['categorien']:
child2 = QtWidgets.QTreeWidgetItem([categorie])
child2.setCheckState(0, QtCore.Qt.Unchecked)
child.addChild(child2)
uitgavenstructuur = requests.get(url="http://localhost:32769/_db/piekenpijp/incoming/uitgavenstructuur")
uscontent = json.loads(uitgavenstructuur.content)
self.uitgaven = uscontent
uitgaventree = QtWidgets.QTreeWidgetItem(["Uitgaven"])
for groep in uscontent:
child = QtWidgets.QTreeWidgetItem([groep['groep']])
uitgaventree.addChild(child)
for categorie in groep['categorien']:
child2 = QtWidgets.QTreeWidgetItem([categorie])
child2.setCheckState(0, QtCore.Qt.Unchecked)
child.addChild(child2)
self.treeWidget.itemChanged.connect(self.vinkje)
self.treeWidget.resize(500, 200)
self.treeWidget.setColumnCount(1)
self.treeWidget.setHeaderLabels(["Categorie"])
self.treeWidget.addTopLevelItem(inkomstentree)
self.treeWidget.addTopLevelItem(uitgaventree)
self.treeWidget.expandItem(uitgaventree)
self.gridLayout.addWidget(self.treeWidget, 0, 2, 1, 1)
Your current method creates a new item, sets its check-state, and then throws it away without using it. Instead, you need to find the items in the tree that you have already created:
def checkActiveTreeItems(self):
for label in self.transactie['transactie']['labels']:
for item in self.treeWidget.findItems(label, Qt.MatchExactly):
item.setCheckState(0, QtCore.Qt.Checked)
I want to apply a certain behaviour to a label. When a lateral button is clicked, the corresponding label should rotate 90 degrees. It can be easily done in vala, but I can't discover the particular syntax on genie.
The vala code I am trying to reproduce comes from elementary OS getting started guide:
hello_button.clicked.connect(() =>
{
hello_label.label = "Hello World!";
hello_button.sensitive = false;
});
rotate_button.clicked.connect(() =>
{
rotate_label.angle = 90;
rotate_label.label = "Verbal";
rotate_button.sensitive = false;
});
I actually managed to reproduce almost entirely the code in Genie, for the exception of the rotation. Here is how far I got:
/* ANOTHER GTK EXPERIMENT WITH GENIE BASED ON ELEMENTARY INTRODUCTORY PAGE
** compile with valac --pkg gtk+03.0 layoutgtkexample.gs */
[indent=4]
uses Gtk
init
Gtk.init (ref args)
var window = new Gtk.Window()
window.title = "Hello World!"
window.set_border_width(12)
var layout = new Gtk.Grid ()
layout.column_spacing = 6
layout.row_spacing = 6
var hello_button = new Gtk.Button.with_label("Say Hello")
var hello_label = new Gtk.Label("Hello")
var rotate_button = new Gtk.Button.with_label ("Rotate")
var rotate_label = new Gtk.Label("Horizontal")
// add first row of widgets
layout.attach (hello_button, 0, 0, 1,1)
layout.attach_next_to (hello_label, hello_button, PositionType.RIGHT, 1, 1)
// add second row of widgets
layout.attach(rotate_button, 0,1,1,1)
layout.attach_next_to(rotate_label, rotate_button, PositionType.RIGHT, 1, 1)
window.add(layout)
hello_button.clicked.connect(hello_pushed)
rotate_button.clicked.connect(rotate_pushed)
window.destroy.connect(Gtk.main_quit)
window.show_all ()
Gtk.main ()
def hello_pushed (btn:Button)
btn.label = "Hello World!"
btn.sensitive = false
def rotate_pushed (btn:Button)
btn.label = "Vertical"
//btn.angle = 90
btn.sensitive = false
The problem is to do with where identifiers are valid and is known as "scope".
The Vala example makes use of an anonymous function, also called a lambda expression in Vala. An anonymous function can be a "closure", when the variables in the scope that defines the anonymous function are also available within the anonymous function. This is useful because the callback occurs after the original block of code has been run, but the variables are still available within the callback. So in the Vala example, where both the button and label are defined in the enclosing scope, the button and label are also available in the callback anonymous function.
Unfortunately Genie isn't able to parse anonymous functions as function arguments, in this case within the connect() call. Although some work has been done on this in 2015. So you have rightly used a function name instead. The problem is the callback only passes the button as an argument and not the adjacent label. So to make the label available within the callback function we could use a class:
/* ANOTHER GTK EXPERIMENT WITH GENIE BASED ON ELEMENTARY INTRODUCTORY PAGE
** compile with valac --pkg gtk+-3.0 layoutgtkexample.gs */
[indent=4]
uses Gtk
init
Gtk.init (ref args)
new RotatingButtonWindow( "Hello World!" )
Gtk.main ()
class RotatingButtonWindow:Window
_hello_label:Label
_rotate_label:Label
construct( window_title:string )
title = window_title
set_border_width(12)
var layout = new Grid ()
layout.column_spacing = 6
layout.row_spacing = 6
// add 'hello' row of widgets
var hello_button = new Button.with_label("Say Hello")
_hello_label = new Label("Hello")
layout.attach (hello_button, 0, 0, 1,1)
layout.attach_next_to (_hello_label, hello_button, PositionType.RIGHT, 1, 1)
// add 'rotate' row of widgets
var rotate_button = new Button.with_label ("Rotate")
_rotate_label = new Label("Horizontal")
layout.attach(rotate_button, 0,1,1,1)
layout.attach_next_to(_rotate_label, rotate_button, PositionType.RIGHT, 1, 1)
add(layout)
hello_button.clicked.connect(hello_pushed)
rotate_button.clicked.connect(rotate_pushed)
destroy.connect(Gtk.main_quit)
show_all ()
def hello_pushed (btn:Button)
_hello_label.label = "Hello World!"
btn.sensitive = false
def rotate_pushed (btn:Button)
_rotate_label.label = "Vertical"
_rotate_label.angle = 90
btn.sensitive = false
A few notes:
By placing the definitions of the _hello_label and _rotate_label within the scope of the class they become available to all the functions defined in the class. Definitions like this are often called "fields". The underscore means they are not available outside the class, so in the example you cannot access them from init
construct() is called when the object is created, in the example the line new RotatingButtonWindow( "Hello World!" ) instantiates the object. If you repeat the line you will have two separate windows, that is two instances of the RotatingButtonWindow data type
You will notice that the RotatingButtonWindow type is also defined as a Window type. This means it is adding more detail to the Gtk.Window class. This is why title and set_border_width() can be used within the new class. They have been "inherited" from the parent Gtk.Window class
By using the Gtk namespace with uses Gtk we don't need to prefix everything with Gtk
As your Gtk application gets more complex you probably want to look at GtkBuilder. That allows windows and widgets to be laid out in an external file. Then use GResource to build the file into the binary of your application so there is no need to distribute the UI file separately.
I am building an application using platebutton iin wxpython. The problem is that I am not able to manually SetState of the toogle buton. I used SetState(0) but it does not change the state of toggle button. Any help would be great. Thanks. Sample code:
self.infinity= platebutton.PlateButton(self._ribbon,wx.ID_NEW, bmp = wx.Bitmap('infinity.bmp'), pos = (0,0), size = (38,18), style= platebutton.PB_STYLE_NOBG |platebutton.PB_STYLE_TOGGLE)
def OnInfinityToggled(self,event):
if event.GetEventObject().IsPressed():
self.popupmenu = wx.Menu()
Session = self.popupmenu.Append(-1, "Session")
self.Bind(wx.EVT_MENU, self.SessionMenu, Session)
self.PopupMenu(self.popupmenu,(2,23))
else:
pass
def SessionMenu(self, event):
print 5
self.infinity.SetState(0)
self.infinity.Raise()
PLATE_NORMAL = 0
PLATE_PRESSED = 1
PLATE_HIGHLIGHT = 2
SetState(0) means set to normal.
Here's how I managed to toggle state:
btn._ToggleState()
btn._pressed = True
I had the same problem. Playing around I managed to resolve my problem with
button._SetState(ix)
button.Refresh()
where ix = your choice of state.
Just started learning Groovy, got the PragProg book "Programming Groovy" and had a problem compiling one of the sample scripts:
class GCar2 {
final miles = 0
def getMiles() {
println "getMiles called"
miles
}
def drive(dist) {
if (dist > 0) {
miles += dist
}
}
}
def car = new GCar2()
println "Miles: $car.miles"
println 'Driving'
car.drive(10)
println "Miles: $car.miles"
try {
print 'Can I see the miles? '
car.miles = 12
} catch (groovy.lang.ReadOnlyPropertyException ex) {
println ex.message
GroovyCar2.groovy: 20: cannnot access final field or property outside of constructor.
# line 20, column 35.
def drive(dist) { if (dist > 0) miles += dist }
^
Groovy versions prior to 1.7 do not give an error. I looked through whatever documentation I could find and did not see the issue discussed. What is going on here?
Aaron
I don't know much about Groovy 1.7, but it looks like a bug in earlier versions which has now been fixed - if a variable is final, you shouldn't be able to assign to it outside the constructor (or its declaration). If you can, what's the point of making it final?
I doubt that it'll stop you from reading it outside the constructor though...
You shouldn't be able to assign to a final variable in a normal method. It was a bug in groovy, fixed in 1.7.
In Ruby, objects have a handy method called method_missing which allows one to handle method calls for methods that have not even been (explicitly) defined:
Invoked by Ruby when obj is sent a message it cannot handle. symbol is the symbol for the method called, and args are any arguments that were passed to it. By default, the interpreter raises an error when this method is called. However, it is possible to override the method to provide more dynamic behavior. The example below creates a class Roman, which responds to methods with names consisting of roman numerals, returning the corresponding integer values.
class Roman
def romanToInt(str)
# ...
end
def method_missing(methId)
str = methId.id2name
romanToInt(str)
end
end
r = Roman.new
r.iv #=> 4
r.xxiii #=> 23
r.mm #=> 2000
For example, Ruby on Rails uses this to allow calls to methods such as find_by_my_column_name.
My question is, what other languages support an equivalent to method_missing, and how do you implement the equivalent in your code?
Smalltalk has the doesNotUnderstand message, which is probably the original implementation of this idea, given that Smalltalk is one of Ruby's parents. The default implementation displays an error window, but it can be overridden to do something more interesting.
PHP objects can be overloaded with the __call special method.
For example:
<?php
class MethodTest {
public function __call($name, $arguments) {
// Note: value of $name is case sensitive.
echo "Calling object method '$name' "
. implode(', ', $arguments). "\n";
}
}
$obj = new MethodTest;
$obj->runTest('in object context');
?>
Some use cases of method_missing can be implemented in Python using __getattr__ e.g.
class Roman(object):
def roman_to_int(self, roman):
# implementation here
def __getattr__(self, name):
return self.roman_to_int(name)
Then you can do:
>>> r = Roman()
>>> r.iv
4
I was looking for this before, and found a useful list (quickly being overtaken here) as part of the Merd project on SourceForge.
Construct Language
----------- ----------
AUTOLOAD Perl
AUTOSCALAR, AUTOMETH, AUTOLOAD... Perl6
__getattr__ Python
method_missing Ruby
doesNotUnderstand Smalltalk
__noSuchMethod__(17) CoffeeScript, JavaScript
unknown Tcl
no-applicable-method Common Lisp
doesNotRecognizeSelector Objective-C
TryInvokeMember(18) C#
match [name, args] { ... } E
the predicate fail Prolog
forward Io
With footnotes:
(17) firefox
(18) C# 4, only for "dynamic" objects
JavaScript has noSuchMethod, but unfortunately this is only supported by Firefox/Spidermonkey.
Here is an example:
wittyProjectName.__noSuchMethod__ = function __noSuchMethod__ (id, args) {
if (id == 'errorize') {
wittyProjectName.log("wittyProjectName.errorize has been deprecated.\n" +
"Use wittyProjectName.log(message, " +
"wittyProjectName.LOGTYPE_ERROR) instead.",
this.LOGTYPE_LOG);
// just act as a wrapper for the newer log method
args.push(this.LOGTYPE_ERROR);
this.log.apply(this, args);
}
}
Perl has AUTOLOAD which works on subroutines & class/object methods.
Subroutine example:
use 5.012;
use warnings;
sub AUTOLOAD {
my $sub_missing = our $AUTOLOAD;
$sub_missing =~ s/.*:://;
uc $sub_missing;
}
say foo(); # => FOO
Class/Object method call example:
use 5.012;
use warnings;
{
package Shout;
sub new { bless {}, shift }
sub AUTOLOAD {
my $method_missing = our $AUTOLOAD;
$method_missing =~ s/.*:://;
uc $method_missing;
}
}
say Shout->bar; # => BAR
my $shout = Shout->new;
say $shout->baz; # => BAZ
Objective-C supports the same thing and calls it forwarding.
This is accomplished in Lua by setting the __index key of a metatable.
t = {}
meta = {__index = function(_, idx) return function() print(idx) end end}
setmetatable(t, meta)
t.foo()
t.bar()
This code will output:
foo
bar
In Common Lisp, no-applicable-method may be used for this purpose, according to the Common Lisp Hyper Spec:
The generic function no-applicable-method is called when a generic function is invoked and no method on that generic function is applicable. The default method signals an error.
The generic function no-applicable-method is not intended to be called by programmers. Programmers may write methods for it.
So for example:
(defmethod no-applicable-method (gf &rest args)
;(error "No applicable method for args:~% ~s~% to ~s" args gf)
(%error (make-condition 'no-applicable-method :generic-function gf :arguments args) '()
;; Go past the anonymous frame to the frame for the caller of the generic function
(parent-frame (%get-frame-ptr))))
C# now has TryInvokeMember, for dynamic objects (inheriting from DynamicObject)
Actionscript 3.0 has a Proxy class that can be extended to provide this functionality.
dynamic class MyProxy extends Proxy {
flash_proxy override function callProperty(name:*, ...rest):* {
try {
// custom code here
}
catch (e:Error) {
// respond to error here
}
}
Tcl has something similar. Any time you call any command that can't be found, the procedure unknown will be called. While it's not something you normally use, it can be handy at times.
In CFML (ColdFusion, Railo, OpenBD), the onMissingMethod() event handler, defined within a component, will receive undefined method calls on that component. The arguments missingMethodName and missingMethodArguments are automatically passed in, allowing dynamic handling of the missing method call. This is the mechanism that facilitated the creation of implicit setter/getter schemes before they began to be built into the various CFML engines.
Its equivalent in Io is using the forward method.
From the docs:
If an object doesn't respond to a message, it will invoke its "forward" method if it has one....
Here is a simple example:
Shout := Object clone do (
forward := method (
method_missing := call message name
method_missing asUppercase
)
)
Shout baz println # => BAZ
/I3az/
Boo has IQuackFu - there is already an excellent summary on SO at how-can-i-intercept-a-method-call-in-boo
Here is an example:
class XmlObject(IQuackFu):
_element as XmlElement
def constructor(element as XmlElement):
_element = element
def QuackInvoke(name as string, args as (object)) as object:
pass # ignored
def QuackSet(name as string, parameters as (object), value) as object:
pass # ignored
def QuackGet(name as string, parameters as (object)) as object:
elements = _element.SelectNodes(name)
if elements is not null:
return XmlObject(elements[0]) if elements.Count == 1
return XmlObject(e) for e as XmlElement in elements
override def ToString():
return _element.InnerText