QLCDNumber 小部件显示带有类似 LCD 数字的数字。 更多...
继承 QFrame .
The QLCDNumber widget displays a number with LCD-like digits.
It can display a number in just about any size. It can display decimal, hexadecimal, octal or binary numbers. It is easy to connect to data sources using the display () slot, which is overloaded to take any of five argument types.
There are also slots to change the base with setMode () and the decimal point with setSmallDecimalPoint ().
QLCDNumber emits the overflow () signal when it is asked to display something beyond its range. The range is set by setDigitCount ()，但 setSmallDecimalPoint () also influences it. If the display is set to hexadecimal, octal or binary, the integer equivalent of the value is displayed.
These digits and other symbols can be shown: 0/O, 1, 2, 3, 4, 5/S, 6, 7, 8, 9/g, minus, decimal point, A, B, C, D, E, F, h, H, L, o, P, r, u, U, Y, colon, degree sign (which is specified as single quote in the string) and space. QLCDNumber substitutes spaces for illegal characters.
It is not possible to retrieve the contents of a QLCDNumber object, although you can retrieve the numeric value with value (). If you really need the text, we recommend that you connect the signals that feed the display () slot to another slot as well and store the value there.
Incidentally, QLCDNumber is the very oldest part of Qt, tracing its roots back to a BASIC program on the Sinclair Spectrum .
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| LCD number widgets shown in various widget styles (from left to right): Motif , CDE , Windows , Windows XP , Macintosh , Plastique . |
This type determines how numbers are shown.
| 常量 | 值 | 描述 |
|---|---|---|
| QLCDNumber.Hex | 0 | Hexadecimal |
| QLCDNumber.Dec | 1 | Decimal |
| QLCDNumber.Oct | 2 | Octal |
| QLCDNumber.Bin | 3 | Binary |
If the display is set to hexadecimal, octal or binary, the integer equivalent of the value is displayed.
This type determines the visual appearance of the QLCDNumber 小部件。
| 常量 | 值 | 描述 |
|---|---|---|
| QLCDNumber.Outline | 0 | gives raised segments filled with the background color. |
| QLCDNumber.Filled | 1 | gives raised segments filled with the windowText color. |
| QLCDNumber.Flat | 2 | gives flat segments filled with the windowText color. |
parent argument, if not None, causes self to be owned by Qt instead of PyQt.
Constructs an LCD number, sets the number of digits to 5, the base to decimal, the decimal point mode to 'small' and the frame style to a raised box. The segmentStyle () 被设为 Outline .
parent argument is passed to the QFrame 构造函数。
另请参阅 setDigitCount () 和 setSmallDecimalPoint ().
parent argument, if not None, causes self to be owned by Qt instead of PyQt.
Constructs an LCD number, sets the number of digits to numDigits , the base to decimal, the decimal point mode to 'small' and the frame style to a raised box. The segmentStyle () 被设为 Filled .
parent argument is passed to the QFrame 构造函数。
另请参阅 setDigitCount () 和 setSmallDecimalPoint ().
返回 true 若 num is too big to be displayed in its entirety; otherwise returns false.
另请参阅 display (), digitCount ()，和 smallDecimalPoint ().
这是重载函数。
返回 true 若 num is too big to be displayed in its entirety; otherwise returns false.
另请参阅 display (), digitCount ()，和 smallDecimalPoint ().
重实现自 QObject.event ().
重实现自 QWidget.paintEvent ().
Calls setMode(Bin). Provided for convenience (e.g. for connecting buttons to it).
另请参阅 setMode (), setHexMode (), setDecMode (), setOctMode ()，和 mode ().
Calls setMode(Dec). Provided for convenience (e.g. for connecting buttons to it).
另请参阅 setMode (), setHexMode (), setOctMode (), setBinMode ()，和 mode ().
Calls setMode(Hex). Provided for convenience (e.g. for connecting buttons to it).
另请参阅 setMode (), setDecMode (), setOctMode (), setBinMode ()，和 mode ().
Calls setMode(Oct). Provided for convenience (e.g. for connecting buttons to it).
另请参阅 setMode (), setHexMode (), setDecMode (), setBinMode ()，和 mode ().
重实现自 QWidget.sizeHint ().
This is the default overload of this signal.
此信号被发射每当 QLCDNumber is asked to display a too-large number or a too-long string.
It is never emitted by setDigitCount ().
