QT common Concepts-1

Catalog

List of articles

1. Time and date ：

1.1 data type

1.2  Related components     

2. listview and listwiget relevant ：

3. Packing related ：

1. Time and date ：

1.1 data type

1. QTime： Time data type , Time , Such as ：14:23:13.
2. QDate： Date data type , Indicates the date , Such as ：2020-4-5.
3. QDateTime： Date time data type , Represents the date and time , Such as ：2020-03-23 08:12:43.

therefore Time It's time ;Date It's the date ;DateTime It's time + date

1.2  Related components     

1. QTimeEdit： Edit and display time components .
2. QDateEdit： Components for editing and displaying dates .
3. QDateTimeEdit： Edit and display date and time components .
4. QCalendarWidget： Select the component of the date in the form of calendar .

QDateEdit and QTimeEdit from QDateTimeEdit inherited , Realize the specific display function of date or time . actually ,QDateEdit and QTimeEdit All display functions can be through QDateTimeEdit Realization , Just set the properties .

QDateTimeEdit The main properties of class are as follows ：

datetime： Date time .
date： date , Set up datetime It will change automatically when date, Again , Set up date when , It will also change automatically datetime The date in the .
time： Time , Set up datetime It will change automatically when time, Again , Set up time when , It will also change automatically datetime Time in .
maximumDateTime、 minimumDateTime： Maximum 、 Minimum date time .
maximumDate、minimumDate： Maximum 、 Minimum date .
maximumTime、minimumTime： Maximum 、 Minimum time .
currentSection： The time and date data segment where the current input cursor is located , Is enumeration type QDateTimeEdit::Section.QDateTimeEdit The display date and time data is divided into multiple segments , Click the up and down buttons on the right side of the edit box to modify the value of the current segment . If the input cursor is YearSection paragraph , Just modify “ year ” Value .
currentSectionIndex： The segment where the input cursor is located, represented by a sequence number .
calendarPopup： Allow a calendar selection box to pop up . When the value is true when , The input button on the right becomes the same as QComboBox Similar drop-down buttons , When you click the button, a calendar selection box appears , Used to select a date on the calendar . about QTimeEdit, This property is not valid .
displayFormat： Display format , Display format of date and time data , For example, set to “yyyy-MM-dd HH:mm:ss”, A date and time data is displayed as “2020-11-02 08:23:46”

2. listview and listwiget relevant ：

3. Packing related ：

1.  
2. setup.py
   1. If I develop a program on my computer , Need to use python Of redis、mysql Modules and their own writing redis_run.py modular . How can I publish the system on the server , How to implement dependent modules and self written modules redis_run.py Pack together , Realize one click installation ？ At the same time, I will write it myself redis_run.py Module to exe The file format is installed to python Global execution path of C:\Python27\Scripts Next ？ In this application scenario ,pip Tools seem useless , Only use python Build tools for setup.py 了 , Using this build tool can realize the above application scenario requirements , Just in setup.py The file indicates the dependent library and version , Then use it on the target machine python setup.py install install .

4. Common function ：

1. QApplication：

   1. QApplication As a whole GUI The entry point of the application , It must be to complete various initializations . The entry function .