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4f03651072
SingleApplication/Windows.md
Itay Grudev 4f03651072 Primary PID support (#36) 
* Added the ability to bring the primary application window to the foreground on Windows systems by adding an option flag. THis option can only be used in Windows development and in applications derived from QApplication with a QMainWindow object.
Because the primary application needs to be instructed to go to the foreground, the option SecondaryNotification must also be set to use this functionality

* Changed the ability to bring the primary application window to the front as discussed in itay-grudev/SingleApplication#31.

Now the process ID of the primary application get stored and is accessible for other instances of the application. It is to the developer to bring the applications windows to the front. For convenience the accompanying readme now contains a paragraph with example of how to do this on Windows systems.

* v3.0.9 Added SingleApplicationPrivate::primaryPid()
2017-10-02 12:17:41 +01:00

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Windows Specific Implementations

Setting the foreground window

In the instanceStarted() example in the README we demonstrated how an application can bring it's primary instance window whenever a second copy of the application is started.

On Windows the ability to bring the application windows to the foreground is restricted, see AllowSetForegroundWindow() for more details.

The background process (the primary instance) can bring its windows to the foreground if it is allowed by the current foreground process (the secondary instance). To bypass this SingleApplication must be initialized with the allowSecondary parameter set to true and the options parameter must include Mode::SecondaryNotification, See SingleApplication::Mode for more details.

Here is an example:

if( app.isSecondary() ) {
    // This API requires LIBS += User32.lib to be added to the project
    AllowSetForegroundWindow( DWORD( app.getPrimaryPid() ) );
}

if( app.isPrimary() ) {
    QObject::connect(
        &app,
        &SingleApplication::instanceStarted,
        this,
        &App::instanceStarted
    );
}

void App::instanceStarted() {
    QApplication::setActiveWindow( [window/widget to set to the foreground] );
}