QProgressBar Class▲
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Header: QProgressBar
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CMake:
find_package(Qt6 REQUIRED COMPONENTS Widgets)
target_link_libraries(mytarget PRIVATE Qt6::Widgets)
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qmake: QT += widgets
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Inherits: QWidget
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Group: QProgressBar is part of basicwidgets
Detailed Description▲
A progress bar is used to give the user an indication of the progress of an operation and to reassure them that the application is still running.
The progress bar uses the concept of steps. You set it up by specifying the minimum and maximum possible step values, and it will display the percentage of steps that have been completed when you later give it the current step value. The percentage is calculated by dividing the progress (value() - minimum()) divided by maximum() - minimum().
You can specify the minimum and maximum number of steps with setMinimum() and setMaximum. The current number of steps is set with setValue(). The progress bar can be rewound to the beginning with reset().
If minimum and maximum both are set to 0, the bar shows a busy indicator instead of a percentage of steps. This is useful, for example, when using QNetworkAccessManager to download items when they are unable to determine the size of the item being downloaded.
See Also▲
See also QProgressDialog
Member Type Documentation▲
enum QProgressBar::Direction▲
Specifies the reading direction of the text for vertical progress bars.
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Constant |
Value |
Description |
|---|---|---|
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QProgressBar::TopToBottom |
0 |
The text is rotated 90 degrees clockwise. |
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QProgressBar::BottomToTop |
1 |
The text is rotated 90 degrees counter-clockwise. |
Note that whether or not the text is drawn is dependent on the style. Currently CleanLooks and Plastique draw the text. Mac, Windows and WindowsVista style do not.
See Also▲
See also textDirection
Property Documentation▲
alignment : Qt::Alignment▲
This property holds the alignment of the progress bar
Access functions:
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alignment() const
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void setAlignment( alignment)
format : QString▲
This property holds the string used to generate the current text
%p - is replaced by the percentage completed. %v - is replaced by the current value. %m - is replaced by the total number of steps.
The default value is "%p%".
Access functions:
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format() const
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void setFormat(const &format)
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void resetFormat()
See Also▲
See also text()
invertedAppearance : bool▲
This property holds whether or not a progress bar shows its progress inverted
If this property is true, the progress bar grows in the other direction (e.g. from right to left). By default, the progress bar is not inverted.
Access functions:
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bool invertedAppearance() const
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void setInvertedAppearance(bool invert)
See Also▲
See also orientation, layoutDirection
maximum : int▲
This property holds the progress bar's maximum value
When setting this property, the minimum is adjusted if necessary to ensure that the range remains valid. If the current value falls outside the new range, the progress bar is reset with reset().
Access functions:
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int maximum() const
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void setMaximum(int maximum)
minimum : int▲
This property holds the progress bar's minimum value
When setting this property, the maximum is adjusted if necessary to ensure that the range remains valid. If the current value falls outside the new range, the progress bar is reset with reset().
Access functions:
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int minimum() const
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void setMinimum(int minimum)
orientation : Qt::Orientation▲
This property holds the orientation of the progress bar
The orientation must be Qt::Horizontal (the default) or Qt::Vertical.
Access functions:
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orientation() const
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void setOrientation(Qt::Orientation)
See Also▲
See also invertedAppearance, textDirection
[read-only] text : const QString▲
This property holds the descriptive text shown with the progress bar
The text returned is the same as the text displayed in the center (or in some styles, to the left) of the progress bar.
The progress shown in the text may be smaller than the minimum value, indicating that the progress bar is in the "reset" state before any progress is set.
In the default implementation, the text either contains a percentage value that indicates the progress so far, or it is blank because the progress bar is in the reset state.
Access functions:
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virtual text() const
textDirection : Direction▲
This property holds the reading direction of the text for vertical progress bars
This property has no impact on horizontal progress bars. By default, the reading direction is QProgressBar::TopToBottom.
Access functions:
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textDirection() const
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void setTextDirection( textDirection)
See Also▲
See also orientation, textVisible
textVisible : bool▲
This property holds whether the current completed percentage should be displayed
This property may be ignored by the style (e.g., QMacStyle never draws the text).
Access functions:
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bool isTextVisible() const
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void setTextVisible(bool visible)
See Also▲
See also textDirection
value : int▲
This property holds the progress bar's current value
Attempting to change the current value to one outside the minimum-maximum range has no effect on the current value.
Access functions:
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int value() const
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void setValue(int value)
Notifier signal:
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void valueChanged(int value)
Member Function Documentation▲
[explicit] QProgressBar::QProgressBar(QWidget *parent = nullptr)▲
Constructs a progress bar with the given parent.
By default, the minimum step value is set to 0, and the maximum to 100.
See Also▲
See also setRange()
[virtual] QProgressBar::~QProgressBar()▲
Destructor.
[override virtual protected] bool QProgressBar::event(QEvent *e)▲
Reimplements: QWidget::event(QEvent *event).
[virtual protected] void QProgressBar::initStyleOption(QStyleOptionProgressBar *option) const▲
Initialize option with the values from this QProgressBar. This method is useful for subclasses when they need a QStyleOptionProgressBar, but don't want to fill in all the information themselves.
See Also▲
See also QStyleOption::initFrom()
[override virtual] QSize QProgressBar::minimumSizeHint() const▲
Reimplements an access function for property: QWidget::minimumSizeHint.
[override virtual protected] void QProgressBar::paintEvent(QPaintEvent *)▲
Reimplements: QWidget::paintEvent(QPaintEvent *event).
void QProgressBar::reset()▲
Reset the progress bar. The progress bar "rewinds" and shows no progress.
void QProgressBar::setRange(int minimum, int maximum)▲
Sets the progress bar's minimum and maximum values to minimum and maximum respectively.
If maximum is smaller than minimum, minimum becomes the only legal value.
If the current value falls outside the new range, the progress bar is reset with reset().
The QProgressBar can be set to undetermined state by using setRange(0, 0).
See Also▲
[override virtual] QSize QProgressBar::sizeHint() const▲
Reimplements an access function for property: QWidget::sizeHint.
void QProgressBar::valueChanged(int value)▲
This signal is emitted when the value shown in the progress bar changes. value is the new value shown by the progress bar.
Notifier signal for property value.