You simply have to set the state of the your button self.x to normal: self.x[‘state’] = ‘normal’ or self.x.config(state=”normal”) This code would go in the callback for the event that will cause the Button to be enabled. Also, the right code should be: self.x = Button(self.dialog, text=”Download”, state=DISABLED, command=self.download) self.x.pack(side=LEFT) The method pack in Button(…).pack() … Read more
HTTP — that is the actual transport protocol between the server and the client — is “stateless” because it remembers nothing between invocations. EVERY resource that is accessed via HTTP is a single request with no threaded connection between them. If you load a web page with an HTML file that within it contains three … Read more
I got resolve it with this tip WPF TabControl: Turning Off Tab Virtualization at http://www.codeproject.com/Articles/460989/WPF-TabControl-Turning-Off-Tab-Virtualization this a class of TabContent with property IsCached.
ST is a monad in which a limited type of side effects are allowed, namely mutable references and mutable arrays. Thus it allows you to implement functions which are pure as seen from the outside world, but which use mutation internally. This is different from State, which only fakes mutation by threading the state through … Read more
I don’t use ST much, but sometimes it is just the best solution. This can be in many scenarios: There are already well-known, efficient ways to solve a problem. Quicksort is a perfect example of this. It is known for its speed and in-place behavior, which cannot be imitated by pure code very well. You … Read more
You can not do exactly what you want to do right now, anyway, the best approach right now is to check when the application it’s running in background/inactive using the AppLifecycleState from the SDK (basically does what your library is trying to do) The library that you are using it’s outdated, since a pull request … Read more
You can set foo to undefined, like so var Hello = React.createClass({ getInitialState: function () { return { foo: 10, bar: 10 } }, handleClick: function () { this.setState({ foo: undefined }); }, render: function() { return ( <div> <div onClick={ this.handleClick.bind(this) }>Remove foo</div> <div>Foo { this.state.foo }</div> <div>Bar { this.state.bar }</div> </div> ); } … Read more
Not sure this will work for everybody, but I ran into this today and someone on the team suggested “have you tried Normal“? Turns out he was right. The following seems to nicely restore your window: if (myWindow.WindowState == WindowState.Minimized) myWindow.WindowState = WindowState.Normal; That works just fine, restoring the window to Maximized if needed. It … Read more
Property wrappers are generating some code for you. What you need to know is the actual generated stored property is of the type of the wrapper, hence you need to use its constructors, and it is prefixed with a _. In your case this means var _mapState: State<Int>, so following your example: import SwiftUI struct … Read more
It’s been some time since I posted the question, which was quite colored by my little experience and knowledge of MVC. Still I received some quite useful input, that eventually led me to find a solution and also gain some insight of MVC. What threw me off in the first place, was that you could … Read more