营销型网站设计房地产,常州微信网站建设案例,基于python的网站开发,做电商讲师课程的网站上两节简单介绍了Qt中对于模型/视图的编程#xff0c;大部分助手里说的很清楚了#xff0c;现在就开始实战部分吧#xff01; 在实际应用中#xff0c;视图展示的数据往往并非一成不变的#xff0c;那么如何实时更新成了一个很重要的问题#xff01;功能#xff1a;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;elsereturn 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;elsereturn 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(roleQt::DisplayRole) { if(orientationQt::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 imodel_count-1; i0; 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 ilist_row.count()-1; i0; 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 i0; i10; 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。转载于:https://www.cnblogs.com/lvdongjie/p/3736780.html
