event-handling

问题 In Xamarin Forms: I want to be able to detect both click/tap and double-click/tap, and to be able to perform different actions. That is, when the button is clicked I want to perform actionA , and when the button is double-clicked I want to perform actionB , and only actionB . 回答1: Do you need an actual button? Else look at the TapGestureRecognizer . In this post is described how you can use it. You can apply it to virtually any control. For example if you would style a Label to look like a

问题 I am using jQuery to submit my form via AJAX. This updates a database record and then returns a response for success or failure. The issue I am having is not critical but more for convenience. When resetting a form it resets all the fields to their default values from when the page loads (for sake of simplicity.) This is not the behavior I want. The reason I want to change this is because if I submit the form and I then decide to change the value again then I decide I want to reset the form

问题 I am using jQuery to submit my form via AJAX. This updates a database record and then returns a response for success or failure. The issue I am having is not critical but more for convenience. When resetting a form it resets all the fields to their default values from when the page loads (for sake of simplicity.) This is not the behavior I want. The reason I want to change this is because if I submit the form and I then decide to change the value again then I decide I want to reset the form

问题 How do you add an event listener or handler to widgets in GWT 1.7? I know there are some questions alreayd about this on SO but it seems they are outdated. For example (ignoring the fact that there is a :hover in CSS) how do I add a Hover listener to a FlexTable for example? 回答1: If you want to add a MouseOverHandler to a FlexTable try this: public class MyFlexTable extends FlexTable implements MouseOverHandler, HasMouseOverHandler { public MyFlexTable() { this.addMouseOverHandler(this); }

问题 What's the key-binding for Control-Shift-Tab? I've tried lots of things and nothing seems to work. I'm already aware of tkinter.ttk.Notebook.enable_traversal. If you know of a handler for tabs being activated, that would suffice, too. 回答1: The general format for representing an event is: <[event modifier(s)-]...event type [-event detail]>. For key-binding Ctrl+Shift+Tab the format would be: 'Control-Shift-KeyPress-Tab'. In this case the event modifiers would be: Control- Shift-, the event

问题 I've searched for the difference about the use of the keyword Handles instead of AddHandler, in VB.NET, but I'm unable to explain why this code doesn't work.. Imports System.Threading Public Class MyClass_EventArgs Inherits System.EventArgs End Class Public Class MyClass Public Event MainThreadFinished(ByVal sender As Object, ByVal e As MyClass_EventArgs) Private WithEvents MyEvents As MyClass Private trd As Thread Public Sub New() 'AddHandler MainThreadFinished, AddressOf Me.MyEvents

问题 I would like to remove a truncate filter on mouseover using VueJS 2. Here is my filter in the template: <div class="eng" @mouseover="showAll">{{ word.english | truncate }}</div> And here is the filter itself: filters: { truncate: function(value) { let length = 50; if (value.length <= length) { return value; } else { return value.substring(0, length) + '...'; } } }, Is there a way to remove the filter on the mouseover event so that the div is not truncated anymore? Thanks! Edit: The showAll()

问题 I want to be able to modify the value property of a trackbar in code without triggering my event handler. I wish to trigger the event only when the control is changed by the user by dragging the slider or moving it with the keyboard. What's the simplest way of achieving this? I have 6 trackbars and I want to change the value of 3 of them depending on which trackbar is changed. The issue is that changing the value of those trackbars will trigger their ValueChanged events. 回答1: One way you can

问题 Good Afternoon, I have some very basic questions on GUI Event Handling. Firstly with C# how can we link events to objects - I am guessing event handlers? If so can each handler use separate code? - How can the event handler locate the objects it must manipulate? I have a rough idea of how it works in JAVA. Pointing me towards a reference would be fine - I have already trawled Google for answers to no avail. Many Thanks, J 回答1: Firstly with C# how can we link events to objects - I am guessing

问题 I have a C# app that subscribes to a topic on our messaging system for value updates. When a new value comes in, I do some processing and then carry on. The problem is, the updates can come faster than the app can process them. What I want to do is to just hold on to the latest value, so I don't want a queue. For example, the source publishes value "1" and my app receives it; while processing, the source publishes the sequence (2, 3, 4, 5) before my app is done processing; my app then