event-handling

问题 What is the simplest way to bind an ICommand to a DataGridTextColumn that will handle a user double click on that column without code behind? Can I somehow expose an underlying FE and do it all in the XAML? This particular column is read only and here is the xaml for it: <dg:DataGridTextColumn Header="Number" Binding="{Binding BusinessId}" Width="75" IsReadOnly="True" CanUserReorder="False" /> Cheers, Berryl 回答1: the short answer is no. you cant create a new command property on a column in

问题 Hey; I have the following visual hyerarchy in a usercontrol: Grid -> Canvas -> MyContentControl MyContentControl is a class derived from ContentControl that has an adorner on top that is a rectangle, this is to make it easier to click on certain objects (increase hit testing area). The adorner is present at all times, but with transparent background. I would like to see the PreviewMouseDown events raised when I click on a MyContentControl from the usercontrol's codebehind, but the event does

问题 I'm using wx.html2.WebView to load a Website in a Dialog, which is working fine. Problem : If the Website can't be reached for any reason, the output will be Could not connect: Connection refused . Desired behaviour : Try to reload the URL after x seconds on every fail. import wx import wx.html2 import time URL = "http://mydomain.tld" class MyBrowser(wx.Frame): def __init__(self, *args, **kwds): wx.Frame.__init__(self, *args, **kwds) self.browser = wx.html2.WebView.New(self) self.browser.Bind

问题 I have a program that is listening to a certain event file handle. Is there a file I can read to get details about the specific event's device that I am listening to? 回答1: Assuming that (a) you're on Linux and (b) you have sysfs mounted (typically on /sys ), you can look at /sys/class/input/eventX . This will be a symlink into the device tree; this should provide you some device details. For example: $ readlink /sys/class/input/event4 ../../devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4

问题 This question continue the question on the link : wxPython Event for ScrolledPanel. I edited the code a little bit so that OnScroll function get the x position of the content's scrollbar and use that to set x position of the header's scrollbar. My problem is I cannot decide when the horizontal scrollbar is rolled. So my program now has the header's horizontal scrollbar rolled whenever any of the content's scrollbars is rolled while I want the header's h-scrollbar rolled when the content's h

问题 Me and my team currently work on the read side of a CQRS and event-sourcing system. We want our projectors to be able to listen to only a subset of all events and we want our projectors to be idempotent since an event can be published many times. Here is our current architecture: Since a projectionist doesn't handle all events how it can know if an event hasn't been received in the correct order or if an event has already been received? We can't use the sequence number because the sequence

问题 This question already has answers here : ReferenceError: event is not defined error in Firefox (2 answers) Closed 3 years ago . Consider the following code: <input id="myinput" type="text" size="40" onkeydown="myFunction()"> function myFunction() { console.log(event); } event is a global object and is known inside the event handler myFunction. However, Firefox throws an error: event is not defined while Chrome and IE output KeyboardEvent {...}. This is one of the most crazy things I have met.

问题 When adding code to an onclick handler, are there any limitations to what can be done? Can I have unlimited statements separated by ; ? Can I declare variables that will live in the global scope? Can I declare an anonymous function right in there and call it? (function(){})();? Is there any limitation? The reason I'm asking is that i'm putting a lot of code in an onclick handler, and only in IE, one variable that I'm declaring and should go to the global scope is not being found afterwards.

问题 during my debug sessions I found a strange thing occurring. I have an EditText control for which I defined the current activity as OnKeyListener to perform validation while user types. Code txtPhoneNumber.setOnEditorActionListener(this); txtPhoneNumber.setOnKeyListener(this); txtPhoneNumber.setOnFocusChangeListener(this); @Override public boolean onEditorAction(TextView v, int actionId, KeyEvent event) { String phoneNumber = ((TextView) v).getText().toString(); if (phoneNumber != null && !""

问题 I have a MDI form that will open a logon form so the user can be authenticated when the user hits the logon button and is properly authenticated i wanted to trigger an event that the parent form could pick up and change some variables ((authenticated = true) for example) I understand how to do this in something like a textbox or a costume usercontrol but im not clear on how to do it between forms because i usually do it through the designer view can someone walk me through triggering an event