(7) Pyqt5 tutorial -- > > window properties and basic controls (continuous update)

1. Form settings

Set the form name	setWindowTitle(‘title’)
Set the form icon	self.setWindowIcon(‘image path’)
Change the size of the form	self.resize(height, wide)
Get the size of the form	self.size()
Get the width of the form	self.width()
Get the height of the form	self.height()
Do not stretch window size	self.setFixedSize(width,height)
Don't maximize	self.setWindowFlags(QtCore.Qt.WindowMinimizeButtonHint)
Get the starting coordinates of the window	self.pos()
Get the size and position of the window	self.frameGeometry()
Set window initialization position	self.setGeometry(x, y, width, height)
Set the window size	self.setFixedSize(width, height)

2. Basic controls

1. Message box —>QMessageBox

Inheritance relationships ：QtWidgets.QMessageBox

Message box type

QMessageBox.information	Message box
QMessageBox.question	Question and answer box
QMessageBox.warning	Warning box
QMessageBox.critical	Error box
QMessageBox.about	About the box

give an example ：QMessageBox.information(QWidget, ‘Title’, 'Content‘, buttons)
QWidget： It's an interface parameter , It can be understood as a parent window
Title： The title of the message box
Content： The contents of the message box
buttons： The button in the message box （ Can be more ）

Parametric button There are many kinds , As follows

• QMessageBox.Ok
• QMessageBox.Yes
• QMessageBox.No
• QMessageBox.Close
• QMessageBox.Cancel
• QMessage.Open
• QMessage.Save

There will be a return value after the message box runs , The return value is which button you choose , Here's a concrete example

        choice=QtWidgets.QMessageBox.question(self,u'Notice!',u'Are you sure to exit?'
            ,QtWidgets.QMessageBox.Yes,QtWidgets.QMessageBox.No)

        if choice==QtWidgets.QMessageBox.Yes:
            print(" You chose the OK button ")
        else:
             print(" You chose the no button ")

Running effect ：

2. Single line text box ：QLineEdit

This is a single line of text input , Be similar to QQ Input box of login interface , You can set plaintext or ciphertext

Let's first introduce some common methods owned by this class

Some methods don't need to pass parameters , Some need

setFont(combobox.currentFont())	Set the font
setPlaceholderText()	Set the text box to display text
setMaxLength()	Set the maximum number of characters allowed in the text box
setReadOnly()	Set the text to read-only
setText()	Set the content of the text box
text()	Returns the contents of the text box
setDragEnable()	Sets whether the text box accepts dragging
selectAll()	Future generations
setFocus()	Get the focus

self.setAlignment( Parameters ) Used to set the alignment of text

Qt.AlignLeft	Align horizontally to the left
Qt.AlignRight	Horizontally right aligned
Qt.AlignCenter	Align horizontally and Center
Qt.AlignJustify	Adjust the spacing horizontally and align the ends
Qt.AlignTop	Vertical alignment up
Qt.AlignBottom	Align vertically down
Qt.AlignVCenter	Align vertically in the middle

self.setEchoMode( Parameters ) Used to set the encoding format

Parameters	explain
QLineEdit.Normal	Normal display of input characters , This is the default option
QLineEdit.NoEcho	No input characters are displayed , Commonly used for password type input , And the length is confidential
QLineEdit.Password	Display platform related password masking characters , Instead of the actual input character
QLineEdit.PasswordEchoOnEdit	Display characters when editing , Responsible for displaying password type input

self.setInputMask( Parameters )

Parameters	explain
000.000.000.000;_	ip Address , The white space character is ‘_’
HH:HH:HH:HH:HH:HH;	MAC Address
0000-00-00	date , White space characters are spaces
>AAAAA-AAAAA-AAAAA-AAAAA-AAAAA;#	License number , The white space character is ‘_’, All letters are capitalized

self.setValidator() Set the verifier for the text box （ Validation rule ）, Any text that may be entered will be restricted

Parameters	explain
QIntValidator	Limit input integers
QDoubleValidator	Limit the input of floating point numbers
QRegexpValidator	Check that the input matches the regular expression

QLineEdit Common signals

selectionChanged	As long as you select the content to send the change, the signal will be sent
textChanged	When modifying text content , This signal will be transmitted
editingFinished	When editing text ends , This signal will be transmitted

There are two ways to see the specific parameter requirements , Or go to the source code , Or read the official manual
The official manual looks like this , Reading the manual should be the fastest

3. Text edit box QTextEdit And text browsing boxes QTextBrowser

4. Various button
5. label QLabel
6. Drop down the selection box comboBox
7. Digital adjustment box QSpinBox
8. Slider bar QSlider
9. knob QDial
10. Progress bar QProgressBar
11. Timer QTimer
12. Digital display QLCDNumber
13. Color dialog
14. Font selection dialog box
15. File selection dialog