Python---Basics review (ix) graphical user interface

Source: Internet
Author: User

Main use of Wxpython (most mature cross-platform Python GUI toolkit) foreplay: Veteran python GUI program (Tkinter)
Import Tkinter.messagebox asMessageBoxclassApplication (Frame): def __init__ (Self,master=None): frame.__init__ (SELF,MASTER,BG="Red") #设置框架类的父类 (based on master< main form >), frame can be considered as the parent container of the control Self.pack () #显示frame控件 self.createwidgets () def createwidgets (self): #用于创建控件 (f Rame's son) Self.nameinput=Entry (self) self.nameInput.pack () Self.alertbutton= Button (self,text="Hello", command=Self.hello) self.alertButton.pack () def hello (self): name= Self.nameinput.Get() Messagebox.showinfo ("Message","Hello,%s"%name) Root=Tk () root.title ("title") Root.wm_minsize ( $, $) App=application (Root) app.mainloop ()

def callback ():var.Set("hhhhhhh") Root=Tk ()var=Stringvar ()var.Set("66666") frame1=Frame (Root) frame2=Frame (root) lb= Label (frame1,textvariable=var, padx= -) Lb.pack (Side=Left ) # img= Image (file="1.gif", imgtype="Photo") img= Photoimage (file="1.gif") lb2= Label (frame1,image=img) lb2.pack (Side=Right ) BTNCM= Button (frame2,text="Next Step", command=callback) Btncm.pack () Frame1.pack () Frame2.pack () Root.mainloop ()
use of label labels (using pictures)
 from tkinter import *== intvar ()    = Checkbutton (root,text="Test  ", variable== Label (root,textvariable=v) l.pack () Root.mainloop ()
Checkbutton Use (1)
 fromTkinter Import *Root=Tk () GIRLS= ["ASD",'DSA','FEF','Fwaf']v=[]def Change (): forIinchV:print (I.Get()) forGirlinchGirls:v.append (Intvar ()) b= Checkbutton (root,text=girl,variable=v[-1],command=Change ) #使用一个固有变量来记录状态 B.pack (anchor=W) #控件相对主窗口在左边root. Mainloop ()
Use of Checkbutton (2)
#对于单选框, multiple buttons correspond to only one variable, check box, multiple buttons for multiple values fromTkinter Import *def change (): Print (v.Get()) root=Tk () v=Intvar () Radiobutton (Root,text=" One", variable=v,value=1, Command=change). Pack (anchor=W) Radiobutton (Root,text=" Both", variable=v,value=2, Command=change). Pack (anchor=W) Radiobutton (Root,text="three", variable=v,value=3, Command=change). Pack (anchor=W) Root.mainloop ()
use of RadioButton (1)
 fromTkinter Import *def change (): Print (v.Get()) root=Tk () v=Intvar () langes= [    ("python",1),    ("JavaScript",2),    ("Lua",3),    ("Ruby",4)] forKey,valinchLanges:radiobutton (Root,text=key,variable=v,value=val,command=change). Pack (anchor=W) Root.mainloop ()
Use of RadioButton (2)
#对于单选框, multiple buttons correspond to only one variable, and for check boxes, multiple buttons correspond to multiple values (obtained using the list)
== Intvar () The variables we declare here should all be written after the main window is generated before you can 
=='nonetype'object'_root'
1first enter the Intvar class.classIntvar (Variable): Def __init__ (self, master=none, Value=none, name=None): variable.__init__ (self, master, value, name)2. Enter the parent classclassvariable:def __init__ (self, master=none, Value=none, name=None): .....ifnot master: #看此处 (Master is the main window, it is a parameter, but we do not pass it in, so it is empty, enter the following code) Master=_default_root #_default_root是什么 self._root=master._root () self._tk=master.tk ...3. _default_root Find _support_default_root=1#也有用, look behind _default_root.=None #是一个全局变量, represents the main window but he is also empty, so there is a property error above, none _root () method------------------------------------------------------------------start viewing TK () root=Tk ()1. View Source CodeclassTk (Misc, Wm): Def __init__ (self, screenname=none, Basename=none, classname='Tk', USETK=1, sync=0, use=None): .....ifusetk: #这里默认传入1, enter the following logic SELF._LOADTK () ...2. View Self._loadtk () method def _loadtk (self): self._tkloaded=1        Global_default_root # Version Sanity checks ... # Create and register the Tkerror and exit commands # We need to inline parts of _register here, _ Register # would register differently-named Commands. ......        if_support_default_root and not _default_root: #查看上面的全局变量, find that you can enter the following logic code _default_root=Self #所以_default_root就是主窗口...------------------------------------------------------------------Conclusion: It can be known from the above that the use of variables such as Intvar requires _default_root (when we do not pass in master) and the main window generates root=TK (), the internal code is _default_root implemented. So both orders need to be guaranteed successively
Reason: source code Analysis

There are other kits pyqt and PYGTK are also widely used.

Python---Basics review (ix) graphical user interface

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.