Extract factory class: Use a simple factory class to create an object instance. For example: for a client event, we may need to initialize an object instance and call several methods to perform a series of operations. If client events often need to be extended, the object instances may be different each time they are initialized. In order to encapsulate the actions of this initialization object and make this behavior easier to maintain, we need to hand over the initialization object action to th
() { //related business }} Usage ScenariosSuppose now to design a shopping cart system for e-commerce sites that sell all kinds of books. One of the simplest cases is to multiply the unit price of all goods, but the reality is definitely more complicated than this. For example, this website may offer 20% discount per copy for all Premium members, 10% discount per copy for intermediate members an
The MFC class library providesCwnd::OnctlcolorFunction. This member function is called when the child window of the working framework is re-painted.Wm_ctlcolorMessage response function. prototype of this function:Afx_msg hbrush onctlcolor (CDC * PDC, cwnd* Pwnd, uint nctlcolor );
ParametersNctlcolor Used to specify the control type, which can be:. Ctlcolor_btn Button Control. Ctlcolor_dlg Dialog Box. Ctlcolor_Edit Edit box. Ctlcolor_listbox List controls. Ctlcolor_msgbox Message Control.
Recently, when I made a checkbox transparent, I encountered a cbutton re-painting. There were many posts on the Internet about this problem and there were many implementation methods.
Here we will only talk about some problems and solutions I have encountered in actual operations.
1. When the wm_ctlcolor is reloaded in the form to achieve transparency, in some systems that use the XP style, the checkbox has a dark background color and does not really achieve the transparency effect, the specific
OnCtlColorThe specific is:1. Set a background brush in the header file
Public
CBrush M_BRUSHBK;
2, add the following sentence in the OnInitDialog
Todo:add Extra initialization here
CBitmap bmp;
Bmp. LoadBitmap (IDB_BITMAP_TEMPBK);
M_brushbk.createpatternbrush (bmp);
M_brushbk.createsolidbrush (RGB (0,255,0)); Use solid color as background
Bmp. DeleteObject ();
3. Return background brush in OnCtlColor function
Hbrush Cxxxxxdlg::onctlcolor (
Here are three ways to implement the default background color for changing dialog boxes: (1) You can set the background color of the update dialog box in Clotteryapp::initinstance () Call SetDialogBkColor (RGB (160,32,240)) That is, you can change the background color Note that the color drawn here is for all dialog boxes in the program SetDialogBkColor (RGB (0,0,255), RGB (255,0,0)); Previous RGB is the background color, the latter RGB is the text colors (2) You can also clotteryd
understand the interfaces that inherit hierarchically, then we can use them directly, or we encapsulate these interfaces and use the interface of the handle class itself.The following is a more complex example to illustrate the problem:The general idea of this example is to use a container (multiset) to simulate a shopping cart, which contains a lot of books, some books are sold at the original price, some books are discounted sales, and discount sal
Every 5.1 and other festivals, you will see a sea of people in the mall. Malls are so attractive because of crazy discounts.
The following uses discounts for malls as an example to describe the strategic model.
Commodity discount algorithm:
Algorithm 1: There is no discount for some products.
Algorithm 2: Take a fixed discount for some commodities.
Algorithm 3: T
gives us a clean and concise way to define our own filters, and then we can use the pipe "|" To complete the filtering.Defining a global custom filter requires the use of the Vue.filter () constructor. This constructor requires two parameters.Vue.filter () Constructor Parameters:1.FILTERID: Filter ID, used as a unique identifier for your filter;2.filter functions: A filter function that takes one function to receive a parameter and then formats the received parameter as the desired data result.
"). Click (function () {var bool = true;
//Storage Asynchronous request results through//1, verify the discount amount is correct
var index = parseint ($ ("#intGiftMold"). Val ());
if (index = = 1) {//full minus var reg =/^[0-9]+,[0-9]+$/;
if (!reg.test ($ ("#strDiscounts"). Val ())) {
$.messager.alert (' ERROR hint ', ' invalid format ' for full discount amount, ' Error ');
How to play the car code of excellent step
The first step: Check the message, see the code
Your carpool code in the little U sent yesterday SMS ~
If the SMS has been deleted, look in the app "notice" column to see the push, your carpool signal in the headlines
The second step: Ask the owner, the signal
The car owner also has a carpool signal.
Your password + owner password = today's discount code!
cart system for e-commerce sites that sell all kinds of books. One of the simplest cases is to multiply the unit price of all goods, but the reality is definitely more complicated than this. For example, this website may offer 20% discount per copy for all Premium members, 10% discount per copy for intermediate members and no discount for junior members.
Accordi
ArticleDirectory
1.1 quotation Management
1.2 non-use mode solution
1.3 what's the problem?
Author: Yunfei Longxing published on read: 1082 comments: 4
First of all, I would like to thank many of my friends for their support, comments, and encouragement. I only have to work hard and write some blog posts to reward everyone for their kindness!
Next, I want to write another mode that is simple but frequently used-Rule mode.
Strategy 1 Scenario 1.1 quotation Management
Temperature so know new, each reading design mode will have a different experience, adhere to a design pattern every day, until skilled use of design patterns.The policy pattern defines many algorithms that do the same work, but with different implementations, it can invoke all the algorithms in the same way, reducing the coupling between the algorithm and the calling algorithm.The following is the strategy class diagram of the big talk design pattern/***/Publicclass Context {private strate
2.7 export documentary Service2.7.1 export Letter of Credit2.7.1.1 business definition of exported letters of creditAfter receiving a letter of credit issued by the issuing bank, the bank where the exporter is located provides a series of services for the exporter, including issuing notices, receiving orders, reviewing orders, sending orders, and collecting foreign exchanges.The content of the exported letter of credit business includes: Review the authenticity of the exported Letter of Credit a
Calculate an array algorithm based on "array 1" and "array 2" to obtain the result of "array 3", and it is best to be efficient.
Array 2 is a set property; array 1 is a product that may only contain one or more attributes.
// Array 1 Array ([100008] => Array ([5] => Array ([name] => Price [0] => Unlimited) [6] => Array ([name] => discount [0] => unlimited )) [100009] => Array ([5] => Array ([name] => Price [8] => 0-29) [6] => Array ([name] =>
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