Qt之模型/视图（实时更新数据）

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上两节简单介绍了Qt中对于模型/视图的编程，大部分助手里说的很清楚了，现在就开始实战部分吧！

在实际应用中，视图展示的数据往往并非一成不变的，那么如何实时更新成了一个很重要的问题！

功能：

（1）添加委托（进度条）

（2）显示文件名称、大小、进度、速度、剩余时间、状态等。

（3）可进行添加、更新、删除、清空等操作。

（4）实时更新数据

先看一个效果图：

委托（进度条）：

ProgressBarDelegate::ProgressBarDelegate(QObject *parent)

: QItemDelegate(parent)

{

}

void ProgressBarDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const

{

if(index.column() == 2)

{

int progress = index.model ()->data(index, Qt::DisplayRole).toInt ();

QStyleOptionProgressBarV2 progressBarOption;

progressBarOption.state = QStyle:: State_Enabled;

progressBarOption.direction = QApplication:: layoutDirection ();

progressBarOption.rect = option.rect;

progressBarOption.fontMetrics = QApplication:: fontMetrics ();

progressBarOption.minimum = 0;

progressBarOption.maximum = 100;

progressBarOption.textAlignment = Qt:: AlignCenter;

progressBarOption.textVisible = true;

progressBarOption.progress = progress;

progressBarOption.text = QString("%1%").arg(progressBarOption.progress);

QApplication:: style ()->drawControl(QStyle::CE_ProgressBar, &progressBarOption, painter);

} else {

return QItemDelegate::paint (painter, option, index);

}

模型:

TableModel::TableModel(QObject *parent)

: QAbstractTableModel(parent), arr_row_list(NULL)

{

}

TableModel::~TableModel(void)

{

arr_row_list = NULL;

}

void TableModel::setHorizontalHeaderList(QStringList horizontalHeaderList)

{

horizontal_header_list = horizontalHeaderList;

}

void TableModel::setVerticalHeaderList(QStringList verticalHeaderList)

{

vertical_header_list = verticalHeaderList;

}

int TableModel::rowCount(const QModelIndex &parent) const

{

if(vertical_header_list.size() > 0)

return vertical_header_list.size();

if(NULL == arr_row_list)

return 0;

else

return arr_row_list->size();

}

int TableModel::columnCount(const QModelIndex &parent) const

{

if(horizontal_header_list.size() > 0)

return horizontal_header_list.size();

if(NULL == arr_row_list)

return 0;

else if(arr_row_list->size() < 1)

return 0;

else

return arr_row_list->at(0).size();

}

QVariant TableModel::data(const QModelIndex &index, int role) const

{

if (!index.isValid())

return QVariant();

if(NULL == arr_row_list)

return QVariant();

if(arr_row_list->size() < 1)

return QVariant();

if (role == Qt::TextAlignmentRole)

{

return int(Qt::AlignLeft | Qt::AlignVCenter);

}

else if (role == Qt::DisplayRole)

{

if(index.row() >= arr_row_list->size())

return QVariant();

if(index.column() >= arr_row_list->at(0).size())

return QVariant();

return arr_row_list->at(index.row()).at(index.column());

}

return QVariant();

}

QVariant TableModel::headerData(int section, Qt::Orientation orientation, int role) const

{

if(role==Qt::DisplayRole)

{

if(orientation==Qt::Horizontal) // 水平表头

{

if(horizontal_header_list.size() > section)

return horizontal_header_list[section];

else

return QVariant();

}

else

{

if(vertical_header_list.size() > section)

return vertical_header_list[section]; // 垂直表头

else

return QVariant();

}

return QVariant();

}

Qt::ItemFlags TableModel::flags(const QModelIndex &index) const

{

if (!index.isValid())

return Qt::NoItemFlags;

Qt::ItemFlags flag = QAbstractItemModel::flags(index);

// flag|=Qt::ItemIsEditable // 设置单元格可编辑,此处注释,单元格无法被编辑

return flag;

}

void TableModel::setModalDatas(QList< QStringList > *rowlist)

{

arr_row_list = rowlist;

}

void TableModel::refrushModel()

{

beginResetModel();

endResetModel();

emit updateCount(this->rowCount(QModelIndex()));

}

视图：

TableView::TableView(QWidget *parent)

: QTableView(parent)

{

this->setAlternatingRowColors(true);

this->setStyleSheet( "QTableView{background-color: rgb(250, 250, 115);"

"alternate-background-color: rgb(141, 163, 215);}" );

this->setSelectionBehavior(QAbstractItemView::SelectRows);

this->horizontalHeader()->setStretchLastSection(true);

this->horizontalHeader()->setHighlightSections(false);

this->verticalHeader()->setVisible(false);

this->setShowGrid(false);

this->setEditTriggers(QAbstractItemView::NoEditTriggers);

this->setSelectionMode(QAbstractItemView::ExtendedSelection);

model = new TableModel();

this->setModel(model);

this->initHeader();

model->setModalDatas(&grid_data_list);

progressbar_delegate = new ProgressBarDelegate();

this->setItemDelegate(progressbar_delegate);

connect(model, &TableModel::updateCount, this, &TableView::updateCount);

this->initHeader();

}

TableView::~TableView(void)

{

if(progressbar_delegate) {

delete progressbar_delegate;

progressbar_delegate = NULL;

}

if(model) {

delete model;

model = NULL;

}

grid_data_list.clear();

}

void TableView::addRow(QStringList rowList)

{

grid_data_list.append(rowList);

model->refrushModel();

}

void TableView::remove()

{

QModelIndexList model_index_list = this->selectedIndexes();

int model_count = model_index_list.count();

if(model_count <= 0)

return;

QList list_row;

for(int i=model_count-1; i>=0; i--)

{

QModelIndex model_index = model_index_list.at(i);

int row = model_index.row();

if(!list_row.contains(row))

list_row.append(row);

}

if(list_row.isEmpty())

return;

qSort(list_row);

for(int i=list_row.count()-1; i>=0; i--)

{

grid_data_list.removeAt(list_row.at(i));

}

model->refrushModel();

}

void TableView::clear()

{

grid_data_list.clear();

model->refrushModel();

}

int TableView::rowCount()

{

return model->rowCount(QModelIndex());

}

void TableView::initHeader()

{

QStringList header;

header << tr("name") << tr("size") << tr("progress") << tr("speed") << tr("left time") << tr("state");

model->setHorizontalHeaderList(header);

}

void TableView::changeValue()

{

//这里以10行尾列进行更新

int row_count = this->rowCount();

if(row_count < 10)

return;

for(int i=0; i<10; i++)

{

QStringList file_list = grid_data_list.at(i);

int progress = rand()0;

QStringList row_list;

row_list << file_list.at(0) << file_list.at(1) << QString::number(progress) << file_list.at(3) << file_list.at(4) << file_list.at(5);

grid_data_list.replace(i, row_list);

}

model->refrushModel();

}

完整的工程（源码）下载地址：http://download.csdn.net/detail/u011012932/6829783。

注：

技术在于交流、沟通，转载请注明出处并保持作品的完整性。

作者：╰☆奋斗ing❤孩子` 原文：http://blog.sina.com.cn/s/blog_a6fb6cc90101hhse.html。

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