event-handling

问题 Is there a way to my C# winforms application knows when Date and time settings has changed on local computer. 回答1: Yes, you want to take a look at SystemEvents.TimeChanged. Microsoft.Win32.SystemEvents.TimeChanged += new EventHandler(SystemEvents_TimeChanged); void SystemEvents_TimeChanged(object sender, EventArgs e) { // The system time was changed } From the documentation: Occurs when the user changes the time on the system clock. 回答2: I think SystemEvents.TimeChanged is what you are

问题 I have a dive that flashs once on click. If you press the button multiple times it will keep flashing until the click count has been executed. I would like to so then if the user was to click the button multiple times, it would stop flashing after the last click. Example https://jsfiddle.net/va6njdry/ $('button').click(function () { $('div').fadeOut().fadeIn().fadeOut().fadeIn(); }); 回答1: Use stop to stop previous animations. $('button').click(function () { $('div').stop(true, true).fadeOut()

问题 I want to get values of my textBox before change its value and after changed its value. String beforeValue = ""; TextBox textBox = new TextBox(); textBox.addFocusHandler(new FocusHandler() { public void onFocus(final FocusEvent event) { beforeValue = textBox.getText(); } }); textBox.addValueChangeHandler(new ValueChangeHandler<String>() { public void onValueChange(final ValueChangeEvent<String> event) { System.out.println("Before value is " + beforeValue); System.out.println("After value is "

问题 This is logic for dragging some cropper over image, and it works. But i have multiple images on different windows (and because of that different files) and I want to assign same logic to all of them, but i dont want to copy same code everywhere. Is there any way to do it? private bool isDragging; private Point clickPosition; private void OnMouseMove(object sender, MouseEventArgs e) { if (isDragging) { Point currentPosition = e.GetPosition(this.Parent as UIElement); double xdiff =

问题 I have following application starter: @SpringBootApplication public class MyApplication { public static void main(String[] args) { SpringApplication springApplication = new SpringApplication(); springApplication.setListeners(Collections.singleton(new MyListenrer())); springApplication.run(MyApplication.class, args) } public static class MyListener implements ApplicationListener<ApplicationEnvironmentPreparedEvent>{ @Override public void onApplicationEvent(ApplicationEnvironmentPreparedEvent

问题 Given, from enthought.traits.api import HasTraits, Tuple, Delegate, Trait, Float,Dict,List class Foo(HasTraits): def __init__(self): super(Foo,self).__init__() self.add_trait('node',List) def _node_items_changed(self,name,old,new): print name print old print new Why do I get: >>> f = Foo() >>> f.node.append(0) node_items <undefined> <traits.trait_handlers.TraitListEvent object at 0x05BA8CF0> The documentation says I should get a list of items added/removed. What am I missing here? This is

问题 Any ideas what could be the reason that the code $('body').on('click', '.btn_add', function(e) {alert("test");}); works, but $('.btn_add').on('click', function(e) {alert("test");}); does not? Thanks, 回答1: It is event delegation: Syntax is : $(staticparent).on(event, selector, fn); in this syntax selector is not a part of DOM, what it means when your page loaded this element was not there in the dom but after some js code execution this .btn_add element added in the DOM. so any event bound on

问题 I'm having a working datatemplate for a ListView with ItemTemplate <ListView ItemTemplate="{StaticResource MYTEMPLATE}" HorizontalAlignment="Center" ScrollViewer.VerticalScrollBarVisibility="Auto" ContinuumNavigationTransitionInfo.IsEntranceElement="True"> <ListView.ItemsPanel> <ItemsPanelTemplate> <VirtualizingStackPanel VerticalAlignment="Bottom"/> </ItemsPanelTemplate> </ListView.ItemsPanel> </ListView> The Template looks like that: <DataTemplate x:Key="GlobalBox"> <Border Background="

问题 Having not any answers to my previous questions about using javascript to measure page turn times, I'm going to start writing my own code (!). To measure the length of tie it takes, I'm proposing dropping a cookie containing a timestamp when the user browses away from a page, then in a subsequent page, comparing that time with 'now' and sending back a request to a URL which will log the interval. It seems that there are 2 possible handlers I could associate the first block of code with - the

问题 DocField has a public bool property IsSelected DocField implements INotifyPropertyChanged I need an event that fires in UserControlDocFieldBaseB when DocField.IsSelected changes. How do I do that? public partial class UserControlDocFieldBaseB : UserControl { private DocField docField = null; public UserControlDocFieldBaseB(DocField DocField) { InitializeComponent(); docField = DocField; } Based on the comment from dkozl this is how I wired it up UserControlDocFieldString is a fairly expensive