在QT中刪除一個dinamically生成的用戶界面？

我在Dialog上配置了一個文件傳輸管理器，需要動態生成幾個UI元素。這裏是產生它的功能：在QT中刪除一個dinamically生成的用戶界面？

qint32 TransferManager::addTransfer(TransferData td){ 

    // Getting the ID for this tranfer 
    qint32 transferID = transfers.size(); 

    td.createGraphicalUI(this,transferID); 

    // Adding it to the UI 
    ui->globalTMLayout->addWidget(td.getFrame()); 

    connect(td.getAcceptButton(),SIGNAL(wasClicked(qint32)),this,SLOT(onTransferAccepted(qint32))); 
    connect(td.getRejectButton(),SIGNAL(wasClicked(qint32)),this,SLOT(onTransferRejected(qint32))); 
    connect(td.getCancelButton(),SIGNAL(wasClicked(qint32)),this,SLOT(onTransferCanceled(qint32))); 

    // Adding the TD 
    transfers << td; 

    // If a transfer is added this needs to be shown 
    this->show(); 

    return transferID; 

}

一旦傳輸完成我需要刪除的所有元素：

void TransferData::createGraphicalUI(QDialog *parent, qint32 td_id){ 
    status = new QLabel(parent); 
    filename = new QLabel(parent); 
    contact_label = new QLabel(parent); 
    accept = new IDPushButton(parent,td_id); 
    reject = new IDPushButton(parent,td_id); 
    cancel = new IDPushButton(parent,td_id); 
    progress = new QProgressBar(parent); 
    statlayout = new QHBoxLayout(); 
    frameLayout = new QVBoxLayout(); 
    frame = new QFrame(parent); 

    // Stylying the frame 
    frame->setStyleSheet("background-color: rgb(255, 255, 255);"); 

    // Setting the messages. 
    QString htmlHeader = "<html><head/><body><p><span style='font-weight:792; color:#0000ff;'>"; 
    QString htmlEnder = "</span></p></body></html>"; 
    QString contactMsg = "Transfer "; 
    QString filenameMsg = "File name: </span><span>" + getFileToBeSent(); 
    QString statusMsg = "Status: </span><span>"; 

    cancel->setText("Cancel"); 
    cancel->setIcon(QIcon(":/Icons/icons/cancel.png")); 
    cancel->setVisible(false); 


    if (getIsATransfer()){ 
     // This is a transfer TO, the file will be uploaded 
     contactMsg = contactMsg + "to: </span><span> " + getConctacName(); 
     statusMsg = statusMsg + "Waiting for file to be accepted."; 
     statlayout->addWidget(status); 
     statlayout->addWidget(cancel); 
     accept->setVisible(false); 
     reject->setVisible(false); 
    } 
    else{ 
     // This is a transfer FROM, the file will be downlaoded 
     contactMsg = contactMsg + "from: </span><span> " + getConctacName(); 
     statusMsg = statusMsg + "Transfer must be accepted before it begins."; 
     accept->setText("Accept"); 
     accept->setIcon(QIcon(":/Icons/icons/ok.png")); 
     reject->setText("Reject"); 
     reject->setIcon(QIcon(":/Icons/icons/cancel.png")); 
     statlayout->addWidget(status); 
     statlayout->addWidget(accept); 
     statlayout->addWidget(reject); 
     statlayout->addWidget(cancel); 

    } 

    status->setText(htmlHeader + statusMsg + htmlEnder); 
    filename->setText(htmlHeader + filenameMsg + htmlEnder); 
    contact_label->setText(htmlHeader + contactMsg + htmlEnder); 

    // Resettign the progress bar 
    progress->setValue(0); 

    // Putting it all together. 
    frameLayout->addWidget(contact_label); 
    frameLayout->addWidget(filename); 
    frameLayout->addLayout(statlayout); 
    frameLayout->addWidget(progress); 
    frame->setLayout(frameLayout); 

}

這是從具有TransferData對象列表的函數調用創建了UI。我不喜歡這樣寫道：

void TransferManager::removeTransferData(qint32 which){ 
    if (which < transfers.size()){ 

     // Deleting the UI 
     transfers[which].removeGraphicalUI(); 

     // Removing the frame 
     QFrame *frame = transfers.at(which).getFrame(); 
     ui->globalTMLayout->removeWidget(frame); 

     // Removing the data itself 
     transfers.removeAt(which); 
    } 
}

哪裏removeGraphicalUI是這樣的功能：

void TransferData::removeGraphicalUI(){ 

    frameLayout->removeWidget(progress); 
    frameLayout->removeWidget(filename); 
    frameLayout->removeWidget(contact_label); 
    statlayout->removeWidget(cancel); 
    statlayout->removeWidget(status); 
    if (!getIsATransfer()){ 
     statlayout->removeWidget(accept); 
     statlayout->removeWidget(reject); 
    } 
}

什麼情況是，框架被刪除，但everythign這是在框架內仍然存在。我用打印的消息檢查了代碼是否能夠實現removeUI功能。

那麼，爲什麼這不起作用，什麼是刪除dinamically生成的用戶界面的正確方法？

謝謝！

來源

2016-06-13 aarelovich

好了，我還沒有找到答案，我的問題，但我發現這樣做的方式：

基本的文件說，當一個QWidget後裔對象被刪除，所有的孩子的被刪除。

所以我所做的是基本上使用QFrame作爲父母的一切，但佈局。

然後，當我想刪除所述框架我會簡單地調用：

frame->~QFrame()

在removeGraphicalUI（）函數，僅此而已。我也評論過這個：

void TransferManager::removeTransferData(qint32 which){ 
    if (which < transfers.size()){ 

     // Deleting the UI 
     transfers[which].removeGraphicalUI(); 

     // Removing the frame 
     // QFrame *frame = transfers.at(which).getFrame(); 
     // ui->globalTMLayout->removeWidget(frame); 

     // Removing the data itself 
     transfers.removeAt(which); 
    } 
}

由於不再需要從GUI中刪除幀。我希望這可以幫助別人。

來源

2016-06-13 12:14:29 aarelovich

實際上刪除幀你需要'刪除幀;' – nib

這是不是frame->〜QFrame（）或者除此之外？ – aarelovich

@aarelovich'delete'負責破壞對象。 C++不是Borland Pascal :) –

在QT中刪除一個dinamically生成的用戶界面？

回答

相關問題