clear

Clear controls does not dispose them - what is the risk?

由 喜夏-厌秋 提交于 2019-11-26 09:57:33
问题 There are multiple threads(a, b, c etc.) about the fact that Clear () ing items in the .NET component containers does not Dispose them(by calling Dispose( true ). Most frequently, IMHO, the Clear-ed components are not used anymore in the application, so it needs explicitly be Disposed after Clearing them from the parent containers. Maybe is a good idea that collection\'s Clear method had a bool parameter dispose that when in true also disposes the collection elements before its removing from

Clear screen in shell

由 非 Y 不嫁゛ 提交于 2019-11-26 08:49:45
问题 Just a quick question: How do you clear the screen in shell? I\'ve seen ways like: import os os.system(\'cls\') This just opens the windows cmd, clears the screen and closes but I want the shell window to be cleared (PS: I don\'t know this helps, but I\'m using version 3.3.2 of Python) Thank you :) 回答1: For OS X, you can use subprocess module and call 'cls' from shell: import subprocess as sp sp.call('cls',shell=True) To prevent '0' from showing on top of the window, replace the 2nd line with

Clear JSF form input values after submitting

由 允我心安 提交于 2019-11-26 08:26:20
问题 If there\'s a form, and has a textbox and a button, how do you erase the content of the textbox after you submit the form? <h:inputText id=\"name\" value=\"#{bean.name}\" /> <h:commandButton id=\"submit\" value=\"Add Name\" action=\"#{bean.submit}\" /> After I enter a value in the textbox and submit, the value still appears in the textbox. I need to clear the content of the textbox once its been submitted. How can I achieve this? 回答1: You can clear the form from the Bean method that gets

How do I clear all variables in the middle of a Python script?

由 一曲冷凌霜 提交于 2019-11-26 07:22:17
问题 I am looking for something similar to \'clear\' in Matlab: A command/function which removes all variables from the workspace, releasing them from system memory. Is there such a thing in Python? EDIT: I want to write a script which at some point clears all the variables. 回答1: The following sequence of commands does remove every name from the current module: >>> import sys >>> sys.modules[__name__].__dict__.clear() I doubt you actually DO want to do this, because "every name" includes all built

How to clear cache Android

由 孤人 提交于 2019-11-26 05:35:36
问题 I need to find a way how to clear the data which my application stores in cache.Basically I am using Fedor\'s ( Lazy load of images in ListView ) lazy list implementation and I want to clear the cache automatically when I have for example 100 images loaded.Any ideas how to do that? EDIT: Code : public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); list=(ListView)findViewById(R.id.list); adapter=new LazyAdapter(this, mStrings);

Why does &#39;overflow: auto&#39; clear floats? And why are clear floats needed?

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-11-26 04:50:38
问题 My question arose when I created my (first ever!) two columns. I have a wrapper for my left and right columns, but the wrapper\'s height didn\'t expand to fit the left and right columns with each floated to its side respectively. I found a solution online where it adds the style (is this the right word?) \'overflow: auto\' to the wrapper. After some research, I\'ve found several articles that explain what the overflow does, including this stackoverflow answer:Why "overflow: hidden" clears a

Best practices for Storyboard login screen, handling clearing of data upon logout

由 让人想犯罪 __ 提交于 2019-11-26 02:22:19
I'm building an iOS app using a Storyboard. The root view controller is a Tab Bar Controller. I'm creating the login/logout process, and it's mostly working fine, but I've got a few issues. I need to know the BEST way to set all this up. I want to accomplish the following: Show a login screen the first time the app is launched. When they login, go to the first tab of the Tab Bar Controller. Any time they launch the app after that, check if they are logged in, and skip straight to the first tab of the root Tab Bar Controller. When they manually click a logout button, show the login screen, and

how to clear the screen in python [duplicate]

由 自古美人都是妖i 提交于 2019-11-26 02:17:25
问题 This question already has answers here : Closed 8 years ago . Possible Duplicates: clear terminal in python How to clear python interpreter console? I\'m trying to write a program in Python but I don\'t know how to clear the screen. I use both Windows and Linux and I use commands to clear the screen in those, but I don\'t know how to do it in Python. How do I use Python to clear the screen? 回答1: If you mean the screen where you have that interpreter prompt >>> you can do CTRL + L on Bash

clearRect function doesn&#39;t clear the canvas

由 邮差的信 提交于 2019-11-26 02:14:46
问题 I\'m using this script on the body onmousemove function: function lineDraw() { // Get the context and the canvas: var canvas = document.getElementById(\"myCanvas\"); var context = canvas.getContext(\"2d\"); // Clear the last canvas context.clearRect(0, 0, canvas.width, canvas.height); // Draw the line: context.moveTo(0, 0); context.lineTo(event.clientX, event.clientY); context.stroke(); } It\'s supposed to clear the canvas each time I move the mouse around, and draw a new line, but it isn\'t

Best practices for Storyboard login screen, handling clearing of data upon logout

由 不打扰是莪最后的温柔 提交于 2019-11-26 01:09:44
问题 I\'m building an iOS app using a Storyboard. The root view controller is a Tab Bar Controller. I\'m creating the login/logout process, and it\'s mostly working fine, but I\'ve got a few issues. I need to know the BEST way to set all this up. I want to accomplish the following: Show a login screen the first time the app is launched. When they login, go to the first tab of the Tab Bar Controller. Any time they launch the app after that, check if they are logged in, and skip straight to the
订阅 clear