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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to be able to detect when a mouse is held down instead of clicked. This is what I have, but instead of a click count I want to be able to detect the mouse being held down. -(void)mouseDown:(NSEvent *)event; { //instead of clickCount I want my if statement to be // if the mouse is being held down. if ([event clickCount] < 1) { } else if ([event clickCount] > 1) { } } 回答1: Presumably you want to detect whether the mouse is being held down for a certain period of time. This is pretty straightforward; it just requires a timer. In

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have received a SQL query that makes use of the distinct keyword. When I tried running the query it took at least a minute to join two tables with hundreds of thousands of records and actually return something. I then took out the distinct and it came back in 0.2 seconds. Does the distinct keyword really make things that bad? EDIT: here's the query SELECT Distinct c.username, o.orderno, o.totalcredits, o.totalrefunds, o.recstatus, o.reason from management.contacts c join management.orders o on (c.custID = o.custID) where o.recDate > to

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am talking about one of these Dialog boxes that pop up: http://jquerymobile.com/test/docs/pages/page-dialogs.html (short url for mobile http://bit.ly/KhCGVD ) Click 'Open Dialog' -- on that dialog box, nothing is copy-able in iOS without unless 'data-ajax="false"' is used in the link. (works fine on Android) Putting '-webkit-user-select: auto!important;' (or 'text' instead of 'auto') does nothing. Adding the javascript 'document.documentElement.style.webkitTouchCallout = "auto";' does nothing. I am desperate to make this work as I have

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm running Tomcat 7.0.53 on CentOS 6.5 64 bit and OpenJDK 1.7 64. I have several servers where occasionally - like randomly once per week - Tomcat will just gracefully shut itself down. I've been looking at this for months and cannot find the reason. The only pattern seems to be a long period of nothing going on then the shutdown. I have upgraded to latest versions of the underlying tools (Tomcat, Java, etc) I am running with the default memory settings I have disabled the SHUTDOWN in the server.xml I have moved MySQL to another box to

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I started up Redis for the first time on my local machine today and then later closed all terminal windows after I shutdown my Rails app. An hour later, I started up the Rails app again and did the following to start the redis server redis-server /usr/local/etc/redis.conf However, it told me # Opening port 6379: bind: Address already in use I therefore assumed it was still running its earlier instance even though I closed the terminal windows on my Mac. Looking at this page http://redis.io/commands/shutdown , I tried to run SHUTDOWN in the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to write a script that will shut down the computer if a few requirements are filled with the command os.system("poweroff") also tried os.system("shutdown now -h") and a few others. but nothing happens when I run it, the computer goes through the code without crashing or producing any error messages and terminates the script normally, without shutting down the computer. How does one shutdown the computer in python? edit: Seems that the commands I have tried requires root access. Is there any way to shut down the machine from the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I understood that the Tk keypress and keyrelease events were supposed only to fire when the key was actually pressed or released? However with the following simple code, if I hold down the "a" key I get a continual sequence of alternating keypress/keyrelease events. Am I doing something wrong or is TkInter buggy? This is Python2.7 on Linux mint. from Tkinter import * def keyup(e): print 'up', e.char def keydown(e): print 'down', e.char root = Tk() frame = Frame(root, width=100, height=100) frame.bind("<KeyPress>", keydown) frame.bind("

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to achieve something like this https://material.google.com/components/bottom-navigation.html#bottom-navigation-behavior But recycler view is hiding below toolbar and no effect is on BottomNavigationView Below is my code activity_main.xml <?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: What is the best way to track down a memory leak that is only found on one customer's test/release box, and no where else? 回答1: dotTrace3.1 (This question is kinda funny, cause I am tracking a mem leak that isn't present on my machine ...) 回答2: Try a memory profiler like ANTS Profiler . 回答3: If the user has the problem it consistently, take a stackdump and analyse in the standard way 回答4: It's either code, data or configuration. Since you say the code is not faulty 100% of the time, I would blame configuration. Take a copy of the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: In a C# MVC5 Internet application view, how can I display a dropdown list for a user to select a list item that is populated from a View Model list? Here is the ViewModel code: public class MapLocationItemViewModel { [Editable(false)] public int mapLocationForeignKeyId { get; set; } public List<string> mapLocationItemTypes { get; set; } public MapLocationItem mapLocationItem { get; set; } } Here is the code that I currently have in the View : <div class="form-group"> @Html.LabelFor(model => model.mapLocationItem.mapLocationItemType, new {