Qdialog slots

8 class FindDialog: public QDialog 9 { 10 Q_OBJECT 11 public: 12 FindDialog(QWidget *parent = 0); The Q_OBJECT macro at the beginning of the class definition is necessary for all classes that define signals or slots. PyQt Signals and Slots - Learn PyQt starting from Introduction, QMenu and QAction Widgets, QToolBar Widget, QDialog Class, QMessageBox, QInputDialog. Signals and Slots in Depth. The signals and slots mechanism is fundamental to Qt programming. It enables the application programmer to bind objects together without.

C++ GUI Programming with Qt4: Creating Dialogs

Modeless Dialogs A modeless dialog is a dialog that operates independently of other windows in the same application. 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:: This button is used to signify that the user accepts the dialog's settings and wishes to close the dialog. Dialogs that are used to request a file name from the user or that are used to set application preferences are usually modal. 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. Modal Dialogs A modal dialog is a dialog that blocks input to other visible windows in the same application.

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Qt Documentation

Dialog boxes present users with options and choices, and allow them to set the options to their preferred values and to make their choices. They are called dialog boxes, or simply "dialogs", because they provide a means by which users and applications can "talk to" each other. Most GUI applications consist of a main window with a menu bar and toolbar, along with dozens of dialogs that complement the main window.

It is also possible to create dialog applications that respond directly to the user's choices by performing the appropriate actions e. We will create our first dialog purely by writing code to show how it is done. Then we will see how to build dialogs using Qt Designer, Qt's visual design tool.

Using Qt Designer is a lot faster than hand-coding and makes it easy to test different designs and to change designs later. It is shown in Figure 2. We will implement the dialog as a class in its own right. By doing so, we make it an independent, self-contained component, with its own signals and slots. We will start with finddialog. Line 3 includes the definition of QDialog, the base class for dialogs in Qt.

QDialog is derived from QWidget. Lines 4 to 7 are forward declarations of the Qt classes that we will use to implement the dialog. We will say more about this shortly. Next, we define FindDialog as a subclass of QDialog: The FindDialog constructor is typical of Qt widget classes. The parent parameter specifies the parent widget. The default is a null pointer, meaning that the dialog has no parent. CaseSensitivity cs ; The signals section declares two signals that the dialog emits when the user clicks the Find button.

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Detailed Description The QDialog class is the base class of dialog windows. 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 support extensibility and can provide a return value. They can have default buttons. Note that QDialog 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.

It will also share the parent's taskbar entry. There are three kinds of dialog that are useful: A modal dialog is a dialog that blocks input to other visible windows in the same application: Modal dialogs have their own local event loop.

Dialogs which are used to request a filename from the user or which are used to set application preferences are usually modal. Call exec to display a modal dialog. When the user closes the dialog, exec will provide a useful return value , and the flow of control will follow on from the exec call at this time. Typically we connect a default button, e.

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Alternatively you can connect to the done slot, passing it Accepted or Rejected. 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 the dialog.

Call show to display a modeless dialog. In practice you will often call show and come to the end of the function in which show is called with control returning to the main event loop.


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