overriding

问题 Stemming from my last question, I am stumped trying to do an override. I am doing exactly what MudithaE's answer here did, too. I want to implement my own _prepareColumns() as found in the file app/code/core/Mage/Adminhtml/Block/Sales/Order/Grid.php . I set up my module's directories and the files as below. While researching, I saw a lot of developers like to do Dev_Module_Block_Adminhtml_blah , so I tried changing the directory structure and class names everywhere in my code. No change. My

问题 default column get for a dataRow in .designer.cs is like public partial class Fi_securityRow : global::System.Data.DataRow { [global::system.diagnostics.debuggernonusercodeattribute()] [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Data.Design.TypedDataSetGenerator", "4.0.0.0")] public override System.DateTime Exp_dt { get { try { return ((global::System.DateTime)(this[this.tableFi_security.Exp_dtColumn])); } catch (global::System.InvalidCastException e) { throw new global:

问题 I'm working on a Magento project and I've overridden the Page Html Header block because I need to change how the getLogoSrc() function (which I found in app/code/core/Mage/Page/Block/Html/Header.php). However I seem to have done something incorrectly as header.phtml is no longer being drawn. app/code/local/NameSpace/Customize/Block/Html/Header.php class NameSpace_Page_Block_Html_Header extends Mage_Page_Block_Html_Header { ...Code... } app/code/local/NameSpace/Customize/etc/config.xml <config

问题 I have a SortedList in my code. I fill inside it key value pairs. When I add an item to SortedList it sorts automatically by key. But i need to sort it by value. Because the values are visible texts in a combobox. They must be alphabetically sorted. I decided to write a class and inherit from SortedList class and override the Add method. But when I looked at the code of Microsoft's SortedList class, I see there is an Insert method and it makes the sorting and unfortunately it is private so I

问题 In most Android apps, onCreate() is overridden with the first bit of code being super.onCreate(savedInstanceState) and I know this gathers the savedInstanceState Bundle and is neccessary for compilation but what about all of the constructors? onResume() , onStop() , onStop() etc. Which overridden methods have important super constructors you need to include? Is there a list somewhere? I see the super constructors included in some code, not in others.. I have included them sometimes myself,

问题 I have a JLabel inside a JPanel. I'm using Netbeans IDE for the GUI of my java program (free design, and no Layout Manager). At runtime I need to highlight a part of my JLabel. Highlighting a part of JLabel can be done as said here : How to highlight part of a JLabel? I don't know how to do that in run time, I mean I already have a JLabel, now how can I override it's paintComponent() method for that purpose ? 回答1: Here is an illustrative example of the answer given by Tikhon Jelvis in the

问题 So the problem is the following. The project needs to intercept all file IO operations, like open() and close() . I am trying to add printf() before calling the corresponding open() or close() . I am not supposed to rewrite the source code by changing open() or close() to myOpen() or myClose() for example. I have been trying to use LD_PRELOAD environment variable. But the indefinite loop problem came up. My problem is like this one. int open(char * path,int flags,int mode) { // print file

问题 I am new user of Magento (in customization). I want to override Mage_Catalog_Block_Product_View_Options_Type_Select.php file in local folder. Till I am doing overriding functionality. Please can any one suggest me which steps should I follow for override this file. And for overriding which other files need to add in local folder. 回答1: There are two way to do it if you want to just override block then copy that file from core to your local folder, please maintain the same folder structure as

问题 I know there is a wiki page about it , but since I'm very new to Rails I am having lot of difficulties in understanding that page. I had to override registration controller for my user. When user fails to signin I want him to be redirected to my custom signin page. But the application send him to the signin page inside the gem. How can I accomplish that? Where should I put this class and how can I change it? I have multiple models, each of them has a different signin page. How can I set the

问题 I created a question and realized that it was due to some design error on my part. However, I do think that that concept can be useful and I would like to know how to solve an issue similar, if possible. I want to create an algorithm that adds up 2 numbers, be it string or int . I also want to be able to output everything in the console and would like to avoid code duplication. I create a generic interface that changes according to the model. Then a class that handles the addition of the two