Global Long Key Capture - Capture long presses(捕获长按键)

最新推荐文章于 2025-11-23 15:36:09 发布

原创最新推荐文章于 2025-11-23 15:36:09 发布 · 978 阅读

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CC 4.0 BY-SA版权

文章标签：

#function #application #user #server #events

本文介绍了一种在Symbian系统中捕获长按键的方法。通过使用RWindowGroup::CaptureKey与RWindowGroup::CaptureLongKey两个函数组合的方式，实现了对按键的长按操作捕获。需要注意的是必须先调用CaptureKey函数后再调用CaptureLongKey函数。

RWindowGroup::CaptureKey function, demonstrated earlier does not allow for capturing long key presses. There is a similar function RWindowGroup::CaptureLongKey, however you cannot just use it instead the CaptureKey.

The trick is to call CaptureLongKey after the CaptureKey. The attached compilable example is an ExeDll that can be run on Emulator with the help of ExeLauncher

void CGlobalCapturer::StartCapturingL() { // Connect to the window server User::LeaveIfError( iWsSession.Connect() ); // Create an invisible window group. Well, we'll make it invisible later iWindowGroup = new (ELeave) RWindowGroup ( iWsSession ); // @see RBlankWindow::Construct iWindowGroup->Construct( (TUint32)iWindowGroup, EFalse );

// You cannot just call CaptureLongKey for the same key code
// You MUST call CaptureKey first
User::LeaveIfError( iCaptureHandle = iWindowGroup->CaptureKey(
KKeyCode , 0, 0 ) );
// And finally capture long key presses
User::LeaveIfError( iLongCaptureHandle = iWindowGroup->CaptureLongKey(
KKeyCode , KKeyCode, 0, 0, 0, 0 ) );
// Send created window to the background and hide it from the
// application switcher
iWindowGroup->SetOrdinalPosition(-1);
iWindowGroup->EnableReceiptOfFocus( EFalse );
iWindowGroupName = CApaWindowGroupName::NewL( iWsSession );
iWindowGroupName->SetHidden(ETrue);
iWindowGroupName->SetWindowGroupName( *iWindowGroup );

// Tell window server, that we are ready to receive events
iWsSession.EventReady( &this->iStatus );
CActiveScheduler::Add( this );
SetActive();
}