QT qtablewidget table column top requirements ideas and codes

QT  Project use QTableWidget when Requirements encountered ：

The top of the table column 、 Cancel topping

Click a column to top , If there is no top column, set it to the first column , If there is a top row in front, row behind the top row .

When canceling the top column , Restore to the last position of the top column , If it is the last column at the top , Don't move the position

（ In the example , Because there is also a header column , So the program 1 In the first column ）

General idea ：

There are custom classes in each column of table items , If you delete and then create a new one, it will be more troublesome .

So I used , First create a new column , Then copy the contents of each table item in the clicked column to the new column , Then delete the click column

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Project example operation process ：

1、 First select the program 1  Top to the first column

2、 Select show 3 Roof placement   Will be scheduled to the program 1 Back

2、 And so on Select show 4 Roof placement   Will be scheduled to the program 3 Back （ At this time, if you cancel the top program 4, Position the same ）

3、 Click on the program 3 Cancel topping , Then it will be ranked to the last item in the top column , And so on

  Main code ：

// Roof placement 
void MyManagement::setColTop() {
    int curCol = clickedTableCol;// Currently click on the column 
    int toCol = 0;
    for(int s = 0;s<programList.size();s++){//programList  All column arrays 
        if(programList[s]->isTop == 1) {//isTop  Is it the top 
            toCol++;
        }
    }
    toCol++;// The number of columns to top ,  If there is no top, go to the first column , If there is a set rule, set the top number +1

    QWidget *item = qTableWidget->cellWidget(0,curCol);
//    TableWidgetHeadItem *item = dynamic_cast<TableWidgetHeadItem*>(ui->qTableWidget->cellWidget(0,curCol));

    qDebug() << " curCol11== " << curCol;
    ui->qTableWidget->insertColumn(toCol); //  Insert column first , Copy the contents of the column into the new column , Delete the front row （ It's complicated not to delete first and then create a new one ）
//    int colnum = ui->qTableWidget->columnCount();
//    ui->qTableWidget->setColumnCount(colnum);// Set number of columns 
    item->setStyleSheet("QLabel{color:rgb(173, 53, 0);}");

    qTableWidget->setCellWidget(0, toCol, item);// Header 

    int nRowCount = qTableWidget->rowCount(); // Copy the contents of the table 
    for(int row=1; row<nRowCount; row++){
        qDebug() << "==row== " << row << " curCol== "<< curCol;
        QWidget *wdg = qTableWidget->cellWidget(row, curCol + 1);// The column has been inserted before   To get the contents of cells, add 1
        qTableWidget->setCellWidget(row, toCol, wdg);
    }

    qTableWidget->removeColumn(curCol + 1);// Delete the click column , Top to the front column , Delete by +1

    //  Modify the attributes in the array 
    for(int s = 0;s<programList.size();s++){
        if(programList[s]->col == curCol) {
            programList[s]->isTop = 1;
            programList[s]->col = toCol;
        }else if(programList[s]->col < curCol && programList[s]->isTop == 0){// Click behind the column to be placed at the top , The front is not the top +1
             programList[s]->col += 1;
        }
    }

    clickedTableCol = toCol;
    qDebug() << " After topping col  Location " << clickedTableCol;

    qTableWidget->setCurrentCell(0, clickedTableCol);

//    ui->qTableWidget->resizeColumnsToContents();
//    ui->qTableWidget->resizeRowsToContents();
}

// Cancel topping 
void MyManagement::cancelColTop() {
    int curCol = clickedTableCol;
    int toCol = 0;
    for(int s = 0;s<programList.size();s++){
        if(programList[s]->isTop == 1) {
            toCol++;
        }
    }
    qDebug() << "  Cancel topping  curCol11== " << curCol << " toCol== " << toCol;

    QWidget *item = qTableWidget->cellWidget(0,curCol);
    item->setStyleSheet("QLabel{color:rgb(255, 255, 255);}");

    if(toCol == curCol) {// At the end of the top   Position the same 
        for(int s = 0;s<programList.size();s++){
            if(programList[s]->col == curCol) {
                programList[s]->isTop = 0;
            }
        }
    } else {
        qTableWidget->insertColumn(toCol + 1);// Top the last column +1  Insert 
        qTableWidget->setCellWidget(0, toCol + 1, item);

        int nRowCount = qTableWidget->rowCount(); // Copy the contents of the table 
        for(int row=1; row<nRowCount; row++){
            qDebug() << "==row== " << row << " curCol== "<< curCol;
            QWidget *wdg = qTableWidget->cellWidget(row, curCol);// The column has been inserted before   To get the contents of cells, add 1
            qTableWidget->setCellWidget(row, toCol + 1, wdg);
        }

        qTableWidget->removeColumn(curCol);

        for(int s = 0;s<programList.size();s++){
            if(programList[s]->col == curCol) {// First modify the current column 
                programList[s]->isTop = 0;
                programList[s]->col = toCol;
            } else if(programList[s]->col > curCol){// Larger than the current top column 
                if(programList[s]->isTop == 1) {// For the top column 
                    programList[s]->col -= 1;
                } 
            }
        }
    }

    clickedTableCol = toCol;
    qDebug() << " After canceling the top col  Location " << clickedTableCol << " toCol== " << toCol;
    qTableWidget->setCurrentCell(0, clickedTableCol);
}