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POHow to optimize qt tablewidget refreshing?
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2012-10-14T06:45:06.983
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I'am using qt to develop a monitor which shows new log items received from the network. I use QTableWidget to display the dynamic items received and the table only shows 100 rows. The problem is: the monitor will receive some 400 'messages' per sec and update the rows. I found using setItem(row,col,item) and new QTableWidgetItem() is quite time-consuming, I only want to show the newest items(three strings at 3 cols) from top to buttom. But the method is really time-consuming, it costs 5.281s when I add 4000 test cases at one time, which should finish in 4000/400 = 10s. So it costs the half time, how to shorten the time? Any better methods to use the qt tablewidget? ;) Thanks for reading! The filterLog function code: <pre><code> start = clock(); filter_log_display(); duration_filterLogDisplay += (double)(finish - start) / CLOCKS_PER_SEC; </code></pre> filter_log_display(): <pre><code> clock_t start = clock(); row_selectable = false; ui->tableWidget->setRowCount(0);//delete table items all row_selectable = true; int size_1 = logDisplayQueue.size() - 1; ui->tableWidget->verticalScrollBar()->setSliderPosition(0); if(size_1+1 < 100) { ui->tableWidget->setRowCount(size_1 + 1); } else { ui->tableWidget->setRowCount(100); } clock_t finish = clock(); duration_setRowCount += (double)(finish - start) / CLOCKS_PER_SEC; for(int queue_i = size_1, index = 0; queue_i >= 0; queue_i--, index++) { start = clock(); LogInfoItem* logItem = (LogInfoItem*)logDisplayQueue.at(queue_i); finish = clock(); duration_getItemFQueue += (double)(finish - start) / CLOCKS_PER_SEC; start = clock(); QString BITS_str = bits2Hexs(logItem->BITS); finish = clock(); duration_bits2Hexs += (double)(finish - start) / CLOCKS_PER_SEC; start = clock(); ui->tableWidget->setItem(index, 0, new QTableWidgetItem(logItem->time));//time ui->tableWidget->setItem(index, 1, new QTableWidgetItem(logItem->name));//name ui->tableWidget->setItem(index, 2, new QTableWidgetItem(BITS_str));//BITS finish = clock(); duration_setItem += (double)(finish - start) / CLOCKS_PER_SEC; start = clock(); if(queue_i == oldRowItemNo)ui->tableWidget->selectRow(index); finish = clock(); duration_ifSelectRow += (double)(finish - start) / CLOCKS_PER_SEC; } </code></pre> Analysis about time: :) There are many places to optimize including this one :) <img src="https://i.stack.imgur.com/JMMpK.png" alt="enter image description here">
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<algorithm><qt><user-interface><optimization>
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How to optimize qt tablewidget refreshing?
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