event-handling

问题 I'm in need of a function that figures out if the user is clicking, double-clicking or dragging the mouse. Since it's all happening in the same canvas using the normal events doesn't work. I found this through google: It is inadvisable to bind handlers to both the click and dblclick events for the same element. The sequence of events triggered varies from browser to browser, with some receiving two click events and others only one. If an interface that reacts differently to single- and double

问题 I'm in need of a function that figures out if the user is clicking, double-clicking or dragging the mouse. Since it's all happening in the same canvas using the normal events doesn't work. I found this through google: It is inadvisable to bind handlers to both the click and dblclick events for the same element. The sequence of events triggered varies from browser to browser, with some receiving two click events and others only one. If an interface that reacts differently to single- and double

问题 I'm in need of a function that figures out if the user is clicking, double-clicking or dragging the mouse. Since it's all happening in the same canvas using the normal events doesn't work. I found this through google: It is inadvisable to bind handlers to both the click and dblclick events for the same element. The sequence of events triggered varies from browser to browser, with some receiving two click events and others only one. If an interface that reacts differently to single- and double

问题 I've got some very old code (15+yr) that used to run ok, on older slower machines with older software versions. It doesn't work so well now because if fails a race condition. This is a general question: tell me why I should have known and expected the failure in this code, so that I can recognise the pattern in other code: procedure TMainform.portset(iComNumber:word); begin windows.outputdebugstring(pchar('portset ' + inttostr(icomnumber))); with mainform.comport do try if open then open :=

问题 I'm new to c# programming so bear with me, there is a concept I couldn't understand in the event handling pattern, here a simple implementation to an event handling class test { someobject.Click += OnClick; private void OnClick(object sender,EventArgs e) { SomeClass someclass = new SomeClass(); } } the problem is why the variable someclass doesn't get garbage collected since it's a local variable in the method OnClick and gets out of scope when this method finishes 回答1: It does get released,

问题 How to alert when scroll page only first time using javascript ? I want to alert only first scroll page, How can i do that ? <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script> <script type="text/javascript"> $(window).scroll(function() { var xxx; if (xxx === '') { var xxx = "test"; var div = $("#myDiv"); alert(div.height()); } }); </script> <DIV id="myDiv" style="height:auto; width:78;overflow:hidden"> Simple Test</DIV> <br><br><br><br><br><br><br><br><br>

问题 I have a GUI that has Entry widget and a submit Button . I am basically trying to use get() and print the values that are inside the Entry widget. I wanted to do this by clicking the submit Button or by pressing enter or return on keyboard. I tried to bind the "<Return>" event with the same function that is called when I press the submit Button: self.bind("<Return>", self.enterSubmit) But I got an error: needs 2 arguments But self.enterSubmit function only accepts one, since for the command

问题 I'm creating a script and have troubles. Is it possible to create an object (of some class) from within a listener? I tried it but I get an error: ``class not found''. I want to do something like: class ONE { class_ONE_code } class TWO { object o = alloc(ONE) } I need this to create a new listener when I execute another listener. 回答1: What you wish to do is certainly possible. Most likely you have a syntax error in your code. For example, your implementation of class TWO is invalid since a

问题 Hellu The question is simple, yet the answers seem to be various and pretty unclear. How can I, in an application A, handle events sent by an application B, and how to implements those events in B? Knowing that B has no idea of the existence of A. Let's say B is a "batch-like" type of program, doing things in the back with no graphical display whatsoever, and A is the nice GUI (pun intended) that should write messages B sends him in a dialog or something. I found interesting answers about

问题 Hellu The question is simple, yet the answers seem to be various and pretty unclear. How can I, in an application A, handle events sent by an application B, and how to implements those events in B? Knowing that B has no idea of the existence of A. Let's say B is a "batch-like" type of program, doing things in the back with no graphical display whatsoever, and A is the nice GUI (pun intended) that should write messages B sends him in a dialog or something. I found interesting answers about