Detailed Description. The QLineEdit widget is a one-line text editor. A line edit allows the user to enter and edit a single line of plain text with a useful collection of editing functions, including undo and redo, cut and paste, and drag and drop. PyQt Signals and Slots - Learn PyQt starting from Introduction, Hello World, Major Classes, Using Qt Designer, Signals and Slots, Layout Management, QBoxLayout, QGridLayout, QFormLayout Class, QLabel Widget, QLineEdit Widget, QPushButton Widget, QRadioButton Widget, QCheckBox Widget, QComboBox Widget, QSpinBox . I have some trouble understanding how signal and slots work. I have an input and a button, I want a value to be written on the input field when I click the button.
Constructs a line edit with no text. See also copy and cut. We clear the line edit in this case to ensure that the new validator is initially given valid input to work with. The completion mode is set using QCompleter:: The width returned, in pixels, is usually enough for about 15 to 20 characters. This function creates the standard context menu which is shown when the user clicks on the line edit with the right mouse button. This will be used to efficiently make changes to the appropriate line edit in each slot.
Line Edits Example
The Line Edits example demonstrates the many ways that QLineEdit can be used, and shows the effects of various properties and validators on the input and output supplied by the user. The example consists of a single Window class, containing a selection of line edits with different input constraints and display properties that can be changed by selecting items from comboboxes.
Presenting these together helps developers choose suitable properties to use with line edits, and makes it easy to compare the effects of each validator on user input.
The Window class inherits QWidget and contains a constructor and several slots:. The slots are used to update the type of validator used for a given line edit when a new validator has been selected in the associated combobox. The line edits are stored in the window for use in these slots.
The Window constructor is used to set up the line edits, validators, and comboboxes, connect signals from the comboboxes to slots in the Window class, and arrange the child widgets in layouts. We begin by constructing a group box to hold a label, combobox, and line edit so that we can demonstrate the QLineEdit:: At this point, none of these widgets have been arranged in layouts.
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A line edit allows the user to enter and edit a single line of plain text with a useful collection of editing functions, including undo and redo, cut and paste, and drag and drop.
By changing the echoMode of a line edit, it can also be used as a "write-only" field, for inputs such as passwords. The length of the text can be constrained to maxLength. The text can be arbitrarily constrained using a validator or an inputMask , or both. When switching between a validator and an input mask on the same line edit, it is best to clear the validator or input mask to prevent undefined behavior. A related class is QTextEdit which allows multi-line, rich text editing.
You can change the text with setText or insert. The text is retrieved with text ; the displayed text which may be different, see EchoMode is retrieved with displayText. Text can be selected with setSelection or selectAll , and the selection can be cut , copy ied and paste d. The text can be aligned with setAlignment. When the text changes the textChanged signal is emitted; when the text changes other than by calling setText the textEdited signal is emitted; when the cursor is moved the cursorPositionChanged signal is emitted; and when the Return or Enter key is pressed the returnPressed signal is emitted.
By default, QLineEdits have a frame as specified by the Windows and Motif style guides; you can turn it off by calling setFrame false. The default key bindings are described below. The line edit also provides a context menu usually invoked by a right mouse click that presents some of these editing options. Any other key sequence that represents a valid character, will cause the character to be inserted into the line edit.
See also setEchoMode and echoMode. See also setText and setMaxLength. The cursor position is set to the end of the line and the maximum text length to characters. See also text and setMaxLength. If no text is selected, deletes the character to the left of the text cursor and moves the cursor one position to the left.
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