QProgressDialog ¶

QProgressDialog class provides feedback on the progress of a slow operation. 更多 …

概要 ¶

函数 ¶

def autoClose ()
def autoReset ()
def labelText ()
def maximum ()
def minimum ()
def minimumDuration ()
def open (receiver, member)
def setAutoClose (close)
def setAutoReset (reset)
def setBar (bar)
def setCancelButton (button)
def setLabel (label)
def value ()
def wasCanceled ()

槽 ¶

def cancel ()
def forceShow ()
def reset ()
def setCancelButtonText (text)
def setLabelText (text)
def setMaximum (maximum)
def setMinimum (minimum)
def setMinimumDuration (ms)
def setRange (minimum, maximum)
def setValue (progress)

信号 ¶

def canceled ()

详细描述 ¶

进度对话框用于给予用户操作将花费多长时间的指示，并演示应用程序没有被冻结。它还可以让用户有机会中止操作。

A common problem with progress dialogs is that it is difficult to know when to use them; operations take different amounts of time on different hardware. QProgressDialog offers a solution to this problem: it estimates the time the operation will take (based on time for steps), and only shows itself if that estimate is beyond minimumDuration() (4 seconds by default).

使用 setMinimum() and setMaximum() or the constructor to set the number of “steps” in the operation and call setValue() as the operation progresses. The number of steps can be chosen arbitrarily. It can be the number of files copied, the number of bytes received, the number of iterations through the main loop of your algorithm, or some other suitable unit. Progress starts at the value set by setMinimum() , and the progress dialog shows that the operation has finished when you call setValue() with the value set by setMaximum() as its argument.

对话框在操作结束时自动重置并隐藏本身。使用 setAutoReset() and setAutoClose() to change this behavior. Note that if you set a new maximum (using setMaximum() or setRange() ) that equals your current value() , the dialog will not close regardless.

There are two ways of using QProgressDialog : modal and modeless.

Compared to a modeless QProgressDialog , a modal QProgressDialog is simpler to use for the programmer. Do the operation in a loop, call setValue() at intervals, and check for cancellation with wasCanceled() 。例如：
progress = QProgressDialog("Copying files...", "Abort Copy", 0, numFiles, self)
progress.setWindowModality(Qt.WindowModal)
for i in range(numFiles):
    progress.setValue(i)
    if progress.wasCanceled():
        break
    #... copy one file
progress.setValue(numFiles)
											
A modeless progress dialog is suitable for operations that take place in the background, where the user is able to interact with the application. Such operations are typically based on QTimer (或 timerEvent() ) or QSocketNotifier ; or performed in a separate thread. A QProgressBar in the status bar of your main window is often an alternative to a modeless progress dialog.

You need to have an event loop to be running, connect the canceled() signal to a slot that stops the operation, and call setValue() at intervals. For example:
# Operation constructor
def __init__(self, parent=None):
    QObject.__init__(self, parent)
    pd =  QProgressDialog("Operation in progress.", "Cancel", 0, 100)
    pd.canceled.connect(self.cancel)
    t =  QTimer(self)
    t.timeout.connect(self.perform)
    t.start(0)
def perform(self):
    pd.setValue(steps)
    #... perform one percent of the operation
    steps += 1
    if steps > pd.maximum():
        t.stop()
def cancel(self):
    t.stop()
    #... cleanup
											
In both modes the progress dialog may be customized by replacing the child widgets with custom widgets by using setLabel() , setBar() ，和 setCancelButton() . The functions setLabelText() and setCancelButtonText() set the texts shown.

另请参阅

QDialog QProgressBar GUI 设计手册：进度指示器查找文件范例像素器范例

class QProgressDialog ( [ parent=None [ , flags=Qt.WindowFlags() ] ] ) ¶

QProgressDialog(labelText, cancelButtonText, minimum, maximum[, parent=None[, flags=Qt.WindowFlags()]])

param parent

QWidget

param cancelButtonText

unicode

param flags

WindowFlags

param labelText

unicode

param minimum

int

param maximum

int

构造进度对话框。

默认设置：

标签文本为空。
The cancel button text is (translated) “Cancel”.
最小为 0；
最大为 100

parent argument is dialog’s parent widget. The widget flags, f , are passed to the QDialog() 构造函数。

另请参阅

setLabelText() setCancelButtonText() setCancelButton() setMinimum() setMaximum()

构造进度对话框。

labelText 是用于提醒用户进展如何的文本。

cancelButtonText 是要在取消按钮上显示的文本。若传递的是 QString()，则不展示取消按钮。

minimum and maximum is the number of steps in the operation for which this progress dialog shows progress. For example, if the operation is to examine 50 files, this value minimum value would be 0, and the maximum would be 50. Before examining the first file, call setValue (0). As each file is processed call setValue (1), setValue (2), etc., finally calling setValue (50) after examining the last file.

parent argument is the dialog’s parent widget. The parent, parent , and widget flags, f , are passed to the QDialog() 构造函数。

另请参阅

setLabelText() setLabel() setCancelButtonText() setCancelButton() setMinimum() setMaximum()

PySide2.QtWidgets.QProgressDialog. autoClose ( ) ¶

返回类型: bool

另请参阅

setAutoClose()

PySide2.QtWidgets.QProgressDialog. autoReset ( ) ¶

返回类型: bool

另请参阅

setAutoReset()

PySide2.QtWidgets.QProgressDialog. cancel ( ) ¶: 重置进度对话框。 wasCanceled() becomes true until the progress dialog is reset. The progress dialog becomes hidden.