event-handling

问题 How do I simulate the touch event in React native? Basically I have X and Y cordinates of an onPress event and want to trigger a touch event at the same position again. This is doable in javascript document.elementFromPoint(x, y).click(); But doable in RN? 来源： https://stackoverflow.com/questions/60994249/react-native-trigger-simulate-touch-event

问题 I have two Forms, Form1 and Form2 and I want to do something in Form2 whenever I call Form2.BringToFront() in Form1. class Form1 : Form { button1_MouseClick() { Form2.BringToFront(); // trigger an event an do something in Form2 } } class Form2 : Form { UnknownEvent_EventHandler() { //do something } } But Documentation on BringToFrontMethod doesn't say which events does this method trigger. Notice I don't want to create a public method on Form2 and call it. 回答1: Well it doesn't fire one

问题 I have two Forms, Form1 and Form2 and I want to do something in Form2 whenever I call Form2.BringToFront() in Form1. class Form1 : Form { button1_MouseClick() { Form2.BringToFront(); // trigger an event an do something in Form2 } } class Form2 : Form { UnknownEvent_EventHandler() { //do something } } But Documentation on BringToFrontMethod doesn't say which events does this method trigger. Notice I don't want to create a public method on Form2 and call it. 回答1: Well it doesn't fire one

问题 I need to process large (~100s) of syslog messages using Perl and Linux::Inotify2. I wrote a test script which generates log messages continuously. To process events, my Perl script looks like this- #!/usr/bin/perl use Linux::Inotify2 ; use Time::HiRes qw(usleep nanosleep); # create a new object my $inotify = new Linux::Inotify2 or die "Unable to create new inotify object: $!" ; # create watch $inotify->watch ("/var/log/messages", IN_ACCESS|IN_OPEN|IN_CLOSE|IN_MODIFY|IN_Q_OVERFLOW) or die

问题 In code I have developed some years ago I have been using this a lot to close the current form on pressing the Escape key at any moment: procedure TSomeForm.FormKeyPress(Sender: TObject; var Key: Char); begin if key = #27 then close; end; This behaviour is defined for the TForm. The form's KeyPreview property is be set to True to let the form react to key presses before any other components. It all works perfectly well for the best part of the program, however, when the Escape key is pressed

问题 In code I have developed some years ago I have been using this a lot to close the current form on pressing the Escape key at any moment: procedure TSomeForm.FormKeyPress(Sender: TObject; var Key: Char); begin if key = #27 then close; end; This behaviour is defined for the TForm. The form's KeyPreview property is be set to True to let the form react to key presses before any other components. It all works perfectly well for the best part of the program, however, when the Escape key is pressed

问题 In code I have developed some years ago I have been using this a lot to close the current form on pressing the Escape key at any moment: procedure TSomeForm.FormKeyPress(Sender: TObject; var Key: Char); begin if key = #27 then close; end; This behaviour is defined for the TForm. The form's KeyPreview property is be set to True to let the form react to key presses before any other components. It all works perfectly well for the best part of the program, however, when the Escape key is pressed

问题 I want to use the onclick method to select a range of data on my matplotlib graph. But the thing is, I can't do that more than once and update the plot. I have some ideas to do this, one of them would be to make a list of plots where I jump to new indices after I appended the new picture ... but mostly I would like to be able to store the information from the click ( event.xdata ) two times to color the area under the graph in that section - but for starters it would already be an achievement

问题 I want to use the onclick method to select a range of data on my matplotlib graph. But the thing is, I can't do that more than once and update the plot. I have some ideas to do this, one of them would be to make a list of plots where I jump to new indices after I appended the new picture ... but mostly I would like to be able to store the information from the click ( event.xdata ) two times to color the area under the graph in that section - but for starters it would already be an achievement

问题 So, my goal is this: if the checkbox is checked by the user, do something (let's say just an alert). Here's my code, that is not working: function validate() { if (document.getElementById('LetterNeed').checked) { alert("checked"); } else { alert("You didn't check it! Let me check it for you."); } } <input type="checkbox" name="LetterNeed" id="LetterNeed">Not important</span> Thanks for your help! 回答1: Call the validate function on change of the checkbox state. <input type="checkbox" name=