QDialog 类是对话框窗口的基类。 更多...
继承 QWidget .
Inherited by QAbstractPrintDialog , QColorDialog , QErrorMessage , QFileDialog , QFontDialog , QInputDialog , QMessageBox , QPageSetupDialog , QPrintPreviewDialog , QProgressDialog and QWizard .
QDialog 类是对话框窗口的基类。
A dialog window is a top-level window mostly used for short-term tasks and brief communications with the user. QDialogs may be modal or modeless. QDialogs can provide a return value ，且它们可以有 default buttons 。QDialogs 也可拥有 QSizeGrip 在其右下角，使用 setSizeGripEnabled ().
注意：QDialog (及任何其它 Widget 有类型 Qt.Dialog ) uses the parent widget slightly differently from other classes in Qt. A dialog is always a top-level widget, but if it has a parent, its default location is centered on top of the parent's top-level widget (if it is not top-level itself). It will also share the parent's taskbar entry.
使用重载 QWidget.setParent () function to change the ownership of a QDialog widget. This function allows you to explicitly set the window flags of the reparented widget; using the overloaded function will clear the window flags specifying the window-system properties for the widget (in particular it will reset the Qt.Dialog 标志)。
A modal dialog is a dialog that blocks input to other visible windows in the same application. Dialogs that are used to request a file name from the user or that are used to set application preferences are usually modal. Dialogs can be 应用程序模态 (the default) or 窗口模态 .
When an application modal dialog is opened, the user must finish interacting with the dialog and close it before they can access any other window in the application. Window modal dialogs only block access to the window associated with the dialog, allowing the user to continue to use other windows in an application.
The most common way to display a modal dialog is to call its exec_ () function. When the user closes the dialog, exec_ () will provide a useful 返回值 . Typically, to get the dialog to close and return the appropriate value, we connect a default button, e.g. OK , to the accept () slot and a Cancel button 到 reject () slot. Alternatively you can call the done () slot with 接受 or Rejected .
An alternative is to call setModal(true) or setWindowModality (), then show (). Unlike exec_ (), show () returns control to the caller immediately. Calling setModal(true) is especially useful for progress dialogs, where the user must have the ability to interact with the dialog, e.g. to cancel a long running operation. If you use show () and setModal(true) together to perform a long operation, you must call QApplication.processEvents () periodically during processing to enable the user to interact with the dialog. (See QProgressDialog .)
A modeless dialog is a dialog that operates independently of other windows in the same application. Find and replace dialogs in word-processors are often modeless to allow the user to interact with both the application's main window and with the dialog.
非模态对话框被显示使用 show (), which returns control to the caller immediately.
若援引 show() function after hiding a dialog, the dialog will be displayed in its original position. This is because the window manager decides the position for windows that have not been explicitly placed by the programmer. To preserve the position of a dialog that has been moved by the user, save its position in your closeEvent() handler and then move the dialog to that position, before showing it again.
对话框的 default button is the button that's pressed when the user presses Enter (Return). This button is used to signify that the user accepts the dialog's settings and wants to close the dialog. Use QPushButton.setDefault (), QPushButton.isDefault () 和 QPushButton.autoDefault () to set and control the dialog's default button.
若用户在对话框中按 Esc 键， QDialog.reject () will be called. This will cause the window to close: The 关闭事件 不能是 ignored .
Extensibility is the ability to show the dialog in two ways: a partial dialog that shows the most commonly used options, and a full dialog that shows all the options. Typically an extensible dialog will initially appear as a partial dialog, but with a 更多 toggle button. If the user presses the 更多 button down, the dialog is expanded. The 扩展范例 shows how to achieve extensible dialogs using Qt.
Modal dialogs are often used in situations where a return value is required, e.g. to indicate whether the user pressed OK or Cancel . A dialog can be closed by calling the accept () or the reject () slots, and exec_ () 会返回 接受 or Rejected as appropriate. The exec_ () call returns the result of the dialog. The result is also available from result () if the dialog has not been destroyed.
In order to modify your dialog's close behavior, you can reimplement the functions accept (), reject () 或 done ()。 closeEvent() function should only be reimplemented to preserve the dialog's position or to override the standard close or reject behavior.
模态对话框：
void EditorWindow.countWords() { WordCountDialog dialog(this); dialog.setWordCount(document().wordCount()); dialog.exec(); }
非模态对话框：
void EditorWindow.find() { if (!findDialog) { findDialog = new FindDialog(this); connect(findDialog, SIGNAL(findNext()), this, SLOT(findNext())); } findDialog->show(); findDialog->raise(); findDialog->activateWindow(); }
由模态对话框返回的值。
| 常量 | 值 |
|---|---|
| QDialog.Accepted | 1 |
| QDialog.Rejected | 0 |
parent argument, if not None, causes self to be owned by Qt instead of PyQt.
构造对话框采用父级 parent .
A dialog is always a top-level widget, but if it has a parent, its default location is centered on top of the parent. It will also share the parent's taskbar entry.
The widget flags f are passed on to the QWidget constructor. If, for example, you don't want a What's This button in the title bar of the dialog, pass Qt.WindowTitleHint | Qt.WindowSystemMenuHint in f .
另请参阅 QWidget.setWindowFlags ().
This method is also a Qt slot with the C++ signature void accept() .
隐藏模态对话框并将结果代码设为 接受 .
重实现自 QWidget.closeEvent ().
重实现自 QWidget.contextMenuEvent ().
This method is also a Qt slot with the C++ signature void done(int) .
关闭对话框并将其结果代码设为 r . If this dialog is shown with exec_ (), done() causes the local event loop to finish, and exec_ () to return r .
As with QWidget.close (), done() deletes the dialog if the Qt.WA_DeleteOnClose flag is set. If the dialog is the application's main widget, the application terminates. If the dialog is the last window closed, the QApplication.lastWindowClosed () 信号被发射。
另请参阅 accept (), reject (), QApplication.activeWindow (), and QApplication.quit ().
重实现自 QObject.eventFilter ().
This method is also a Qt slot with the C++ signature int exec() .
把对话框展示成 modal dialog , blocking until the user closes it. The function returns a DialogCode 结果。
若对话框是 应用程序模态 , users cannot interact with any other window in the same application until they close the dialog. If the dialog is 窗口模态 , only interaction with the parent window is blocked while the dialog is open. By default, the dialog is application modal.
另请参阅 open (), show (), result ()，和 setWindowModality ().
重实现自 QWidget.keyPressEvent ().
重实现自 QWidget.minimumSizeHint ().
This method is also a Qt slot with the C++ signature void open() .
把对话框展示成 窗口模态对话框 , returning immediately.
该函数在 Qt 4.5 引入。
另请参阅 exec_ (), show (), result ()，和 setWindowModality ().
This method is also a Qt slot with the C++ signature void reject() .
隐藏模态对话框并将结果代码设为 Rejected .
重实现自 QWidget.resizeEvent ().
In general returns the modal dialog's result code, 接受 or Rejected .
注意： When used from QMessageBox instance the result code type is QMessageBox.StandardButton
Do not call this function if the dialog was constructed with the Qt.WA_DeleteOnClose 属性。
另请参阅 setResult ().
extension argument has it's ownership transferred to Qt.
Sets the modal dialog's result code to i .
注意： We recommend that you use one of the values defined by QDialog.DialogCode .
另请参阅 result ().
重实现自 QWidget.setVisible ().
重实现自 QWidget.showEvent ().
This method is also a Qt slot with the C++ signature void showExtension(bool) .
重实现自 QWidget.sizeHint ().
This is the default overload of this signal.
This signal is emitted when the dialog has been accepted either by the user or by calling accept () 或 done () with the QDialog.Accepted 自变量。
Note that this signal is not emitted when hiding the dialog with hide () 或 setVisible(false). This includes deleting the dialog while it is visible.
该函数在 Qt 4.1 引入。
另请参阅 finished () and rejected ().
This is the default overload of this signal.
This signal is emitted when the dialog's result code has been set, either by the user or by calling done (), accept ()，或 reject ().
Note that this signal is not emitted when hiding the dialog with hide () 或 setVisible(false). This includes deleting the dialog while it is visible.
该函数在 Qt 4.1 引入。
另请参阅 accepted () and rejected ().
This is the default overload of this signal.
This signal is emitted when the dialog has been rejected either by the user or by calling reject () 或 done () with the QDialog.Rejected 自变量。
Note that this signal is not emitted when hiding the dialog with hide () 或 setVisible(false). This includes deleting the dialog while it is visible.
该函数在 Qt 4.1 引入。
