Qt细节笔记

Bertha 。 2022-09-18 03:53 302阅读 0赞

1.在view视图中设置不可编辑：   listView\->setEditTriggers(QAbstractItemView::NoEditTriggers);

2.QTableView改变被选择上的项颜色, qss样式语法：View\->setStyleSheet("QListView::item:selected\{background:red\}");

3.对话框去掉右上角的问号: setWindowFlags(windowFlags()&~Qt::WindowContextHelpButtonHint);

4.对话框加上最小化按钮: setWindowFlags(windowFlags()|Qt::WindowMinimizeButtonHint);

5.设置字体的属性： QFont listFont; listFont.setPixelSize(18); listFont.setBold(true); listFont.setWeight(50); listView->setFont(listFont);

6.QListView的添加和删除： //QListView通过QStringList提供值给QStringListModel，然后他通过setModel设置mode QStringListModel \*model = new QStringListModel(); QStringList data; data += "data1"; data += "data2"; data += "data3"; model->setStringList(data);//mode添加data QListView \*listView = new QListView(parent); listView->setModel(model);//设置mode 重新添加和删除时需要： data .clear(); model->removeRows(0,model->rowCount()); //给data重新赋值，然后重新添加data model->setStringList(data); //高亮显示某一行 listView->setCurrentIndex(index); //首先遍历再显示 QList<qstring>::Iterator it = data.begin(),end = data.end(); int i = 0; for (; it != end; it++, i++) \{ if (\*it == index.data())//找到，高亮显示 \{ QModelIndex index = model->index(i); listView->setCurrentIndex(index); break; \} \} </qstring>

7.添加QSS到qss文件： //添加QSS到qss文件 QFile qss(":css.qss"); qss.open(QFile::ReadOnly); qApp->setStyleSheet(qss.readAll()); qss.close();

不错的博客关于Qss的：[http://blog.163.com/qimo601@126/blog/static/15822093201301144449315/][http_blog.163.com_qimo601_126_blog_static_15822093201301144449315]

8.Qt 测试Item是否处于选中状态 //Qt 测试Item是否处于选中状态 if( option.state & QStyle::State\_Selected ) \{ qDebug() << "ListDelete::paint" << index.data(); \}

9.不错的讲解代理（委托的博客）[http://qimo601.iteye.com/blog/1539147][http_qimo601.iteye.com_blog_1539147]

10.**实现在QTableView中绘制Pixmap图片 ，****详细请看具体例子**[Qt-在表格(QTableView)中插入图片][Qt-_QTableView] void MyItemDelegate::paint(QPainter \* painter, const QStyleOptionViewItem & option, const QModelIndex & index) const \{ if(index.column()!=0)\{ QItemDelegate::paint(painter,option,index); return; \} const QAbstractItemModel \* model=index.model(); QVariant var=model->data(index,Qt::CheckStateRole); if(var.isNull()) var=false; const QPixmap & star=var.toBool()? favouritePixmap:notFavouritePixmap; int width=star.width(); int height=star.height(); QRect rect=option.rect; int x=rect.x()+rect.width()/2-width/2; int y=rect.y()+rect.height()/2-height/2; painter->drawPixmap(x,y,star); \}

11.QListView的QSS的设置： QListView \{ color:black; //文字颜色 selection-background-color:rgb(248,168,16);//被选中的item的背景色 selection-color: red;//被选中的item的文字的颜色 \} 或者 listView->setStyleSheet("color:black; selection-background-color:rgb(248,168,16);selection-color: red"); \}

12.委托重写paint（）方法--为tableWidget的一行一列（1,1）中添加文字的icon和文字：如图：![Center][] void TableWidgetDelete::paint(QPainter \*painter, const QStyleOptionViewItem &option, const QModelIndex &index) const \{ if ((1 == index.row()) && (1 == index.column())) \{ QStyleOptionViewItem myOption = option; QPixmap pixmap = QPixmap(":/icon.bmp"); int x = option.rect.x(); int y = option.rect.y(); int offset\_x = pixmap.width() / 2; int offset\_y = (option.rect.height() - pixmap.height()) / 2; //Qt Test Item is in a selected state if(option.state & QStyle::State\_Selected ) \{ const QPixmap &pixmap1 = pixmap; painter->fillRect(myOption.rect, myOption.palette.highlight()); painter->fillRect(myOption.rect, QColor(248,168,16,255) ); painter->drawPixmap(x + offset\_x, y + offset\_y, pixmap1); //Draw Text myOption.displayAlignment = Qt::AlignLeft | Qt::AlignVCenter; myOption.rect = QRect(option.rect.x() + (4 \* offset\_x) , option.rect.y(), option.rect.width() - (4 \* offset\_x), option.rect.height()); QStyledItemDelegate::paint(painter, myOption, index); \} else \{ QStyledItemDelegate::paint(painter, myOption, index); \} \} else \{ QStyledItemDelegate::paint(painter, option, index); \} \}

13.listWidget用iconMode 显示的时候需要注意的问题： listWidget->item(i)->setSizeHint(QSize(136,153)); //listWidget选中后的大小 listWidget->setIconSize(QSize(112,112)); //list的Icon的大小 \*image = image->scaled(QSize（112,112）, Qt::KeepAspectRatio); //若icon太多可以通过scaled调整 // QListView::item \{ border-top: 6; padding-top: 6; \} QListView::item:selected\{background-image:url(:/images.png); \}

14.从目录中读取文件列表，并各个处理文件。 //在目录中一个一个处理文件的读取方法 QString path = "C:/file\_list"; QDir dir(path); QStringList list; if(dir.exists())\{ list = dir.entryList(); \} QString picture\_path; QImage image; for ( int i = 0; i < list.size(); i++ ) \{ picture\_path = QString("%1%2%3").arg(path).arg("/").arg(list\[i\]); bool load\_result = image.load(pic\_path); if(!load\_result)\{ ...... \}else\{ ...... \} \}

15.QFontMetrics类中的函数可以处理字符串 width ，每个字符的 width；字符串的 boundingRect().width() ，和每个字符的 boundingRect().width()。

[http_blog.163.com_qimo601_126_blog_static_15822093201301144449315]: http://blog.163.com/qimo601@126/blog/static/15822093201301144449315/
[http_qimo601.iteye.com_blog_1539147]: http://qimo601.iteye.com/blog/1539147
[Qt-_QTableView]: http://qimo601.iteye.com/blog/1538333
[Center]: /images/20220828/7a9b70a3742440abb7aaac635794428c.png