2024-07-11
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QLineEdit is used to represent a single-line input box, where you can enter a paragraph of text but cannot wrap.
Core Attributes:
| Attributes | illustrate |
|---|---|
| text | Text in the input box |
| inputMask | Input content format constraints |
| maxLength | The maximum length |
| frame | Whether to add a border |
| echoMode | Display mode: 1. QLineEdit::Normal: This is the default value, the text box will display the entered text. 2. QLineEdit::Password: In this mode, the entered characters will be hidden, usually replaced by (*) or (=) 3. QLineEdit::NoEcho: In this mode, the text box will not echo any entered characters |
| cursorPosition | Cursor location |
| alignment | Text alignment, set horizontal and vertical alignment |
| dragEnabled | Is dragging allowed? |
| readOnly | Is it read-only (modification is not allowed) |
| placeHolderText | When the input box is empty, what kind of prompt message is displayed |
| clearButtonEnabled | Whether the "clear button" will be automatically displayed |
Core signal:
| Signal | illustrate |
|---|---|
| void cursorPositionChanged(int old, int new) | When the mouse moves, a signal is emitted, old is the previous position, and new is the new position |
| void editingFinished() | This signal is emitted when the Back or Enter key is pressed, or when the line edit loses focus. |
| void returnPressed() | This signal is triggered when the return or enter key is pressed. If a validator is set, it must pass the validation to be triggered. |
| void selectionChanged() | This signal is emitted when the selected text changes. |
void textChanged(const QString
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