网站建设 企炬江阴,枣庄网站开发,seo的方式包括,青岛网络工程优化文章目录 基本属性信号一、信号种类二、信号测试1、currentItemChanged、itemCollapsed、itemExpanded三个信号的测试2、itemActivated信号3、 itemChanged信号4、其余信号的测试代码#xff08;包含以上代码#xff09; 基本属性
信号
一、信号种类
//当前项发生变化时触… 文章目录 基本属性信号一、信号种类二、信号测试1、currentItemChanged、itemCollapsed、itemExpanded三个信号的测试2、itemActivated信号3、 itemChanged信号4、其余信号的测试代码包含以上代码 基本属性
信号
一、信号种类
//当前项发生变化时触发使用后不会触发itemClicked、itemDoubleClicked这两个信号支持鼠标和键盘触发
void currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous)//伸展子项和收缩子项
void itemCollapsed(QTreeWidgetItem *item)
void itemExpanded(QTreeWidgetItem *item)//激活项时触发
void itemActivated(QTreeWidgetItem *item, int column)//测试发现只对一级节点的触发有响应
void itemChanged(QTreeWidgetItem *item, int column)//鼠标单击触发
void itemClicked(QTreeWidgetItem *item, int column)//鼠标双击触发
void itemDoubleClicked(QTreeWidgetItem *item, int column)//鼠标光标的移动到项上时触发前提打开鼠标跟踪
void itemEntered(QTreeWidgetItem *item, int column)//鼠标按下时触发
void itemPressed(QTreeWidgetItem *item, int column)//当项发生变化时可以通过键盘上下键触发
void itemSelectionChanged()
二、信号测试
1、currentItemChanged、itemCollapsed、itemExpanded三个信号的测试
测试效果 部分测试代码
int MainWindow::setTreeItem()
{//关掉默认的展开图标ui-m_treeWidget-setRootIsDecorated(false);QFont font(黑体,16);//创建一级父类项QTreeWidgetItem *item_parent new QTreeWidgetItem(ui-m_treeWidget);item_parent-setIcon(0,QIcon(:/new/prefix1/picture/Down.png));//设置一列数据ui-m_treeWidget-setColumnCount(1);item_parent-setFont(0,font);//item_parent-setTextColor(0,Qt::white);item_parent-setText(0,QString::fromLocal8Bit(设备信息));//添加二级项QTreeWidgetItem *item_child new QTreeWidgetItem(item_parent);item_child-setIcon(0,QIcon(:/new/prefix1/picture/AP.png));item_child-setTextAlignment(0,Qt::AlignLeft | Qt::AlignVCenter);item_child-setText(0,QString::fromLocal8Bit(设备一));item_child-setSelected(false);//所选项的展开与收缩信号connect(ui-m_treeWidget,SIGNAL(itemExpanded(QTreeWidgetItem *)),this,SLOT(On_DouClickedTreeOpen_Slots(QTreeWidgetItem *)));connect(ui-m_treeWidget,SIGNAL(itemCollapsed(QTreeWidgetItem *)),this,SLOT(On_DouClickedTreeClose_Slots(QTreeWidgetItem *)));connect(ui-m_treeWidget,SIGNAL(currentItemChanged(QTreeWidgetItem *, QTreeWidgetItem *)),this,SLOT(On_CurrentItemChanged_Slots(QTreeWidgetItem *,QTreeWidgetItem *)));return 0;
}void MainWindow::On_DouClickedTreeClose_Slots(QTreeWidgetItem *item)
{item-setIcon(0,QIcon(:/new/prefix1/picture/Down.png));
}void MainWindow::On_CurrentItemChanged_Slots(QTreeWidgetItem *curren, QTreeWidgetItem *previous)
{if(previous ! NULL)qDebug()curren-text(0)previous-text(0);
}void MainWindow::On_DouClickedTreeOpen_Slots(QTreeWidgetItem *item)
{item-setIcon(0,QIcon(:/new/prefix1/picture/Up.png));
}子项伸展和收缩的应用测试
void MainWindow::init()
{//关闭头部信息ui-m_treeWidget-header()-setVisible(false);//关掉默认的展开图标ui-m_treeWidget-setRootIsDecorated(false);//初始qtree的宽高ui-m_treeWidget-setFixedSize(T_WIDTH,T_HEIGHT);//禁用滑动块ui-m_treeWidget-setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);ui-m_treeWidget-setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);setTreeItem();
}int MainWindow::setTreeItem()
{QFont font(黑体,16);//创建一级父类项QTreeWidgetItem *item_parent new QTreeWidgetItem(ui-m_treeWidget);item_parent-setSizeHint(0,QSize(C_WIDTH,C_HEIGHT));item_parent-setIcon(0,QIcon(:/new/prefix1/picture/Down.png));//设置一列数据ui-m_treeWidget-setColumnCount(1);item_parent-setFont(0,font);item_parent-setText(0,QString::fromLocal8Bit(设备信息));//设置对齐方式item_parent-setTextAlignment(0,Qt::AlignVCenter);addChildItem(item_parent);//所选项的展开与收缩信号connect(ui-m_treeWidget,SIGNAL(itemExpanded(QTreeWidgetItem *)),this,SLOT(On_DouClickedTreeOpen_Slots(QTreeWidgetItem *)));connect(ui-m_treeWidget,SIGNAL(itemCollapsed(QTreeWidgetItem *)),this,SLOT(On_DouClickedTreeClose_Slots(QTreeWidgetItem *)));connect(ui-m_treeWidget,SIGNAL(currentItemChanged(QTreeWidgetItem *, QTreeWidgetItem *)),this,SLOT(On_CurrentItemChanged_Slots(QTreeWidgetItem *,QTreeWidgetItem *)));return 0;
}
void MainWindow::On_DouClickedTreeOpen_Slots(QTreeWidgetItem *item)
{if(item-text(0) QString::fromLocal8Bit(设备信息)){item-setIcon(0,QIcon(:/new/prefix1/picture/Up.png));//根据子节点数目更新宽度int num item-childCount();if(num 0){int h num * C_HEIGHT T_HEIGHT;ui-m_treeWidget-setFixedSize(T_WIDTH,h);}}}
void MainWindow::On_DouClickedTreeClose_Slots(QTreeWidgetItem *item)
{if(item-text(0) QString::fromLocal8Bit(设备信息)){item-setIcon(0,QIcon(:/new/prefix1/picture/Down.png));//回复默认宽高ui-m_treeWidget-setFixedSize(T_WIDTH,T_HEIGHT);}
}2、itemActivated信号
效果图 测试鼠标双击控制和使用键盘的Enter触发
3、 itemChanged信号
测试发现只对一级节点的触发有响应这里关闭了所有项的默认图标
//QSS:关闭子项的默认图标
QTreeView::branch:has-children:!has-siblings:closed,
QTreeView::branch:closed:has-children:has-siblings {
border-image: none;
image: none;
}QTreeView::branch:open:has-children:!has-siblings,
QTreeView::branch:open:has-children:has-siblings {
border-image: none;
image: none;
}效果图 4、其余信号的测试代码包含以上代码
void MainWindow::init()
{//关闭头部信息ui-m_treeWidget-header()-setVisible(false);//关掉默认的展开图标ui-m_treeWidget-setRootIsDecorated(false);//初始qtree的宽高ui-m_treeWidget-setFixedSize(T_WIDTH,T_HEIGHT);//禁用滑动块ui-m_treeWidget-setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);ui-m_treeWidget-setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);setTreeItem();
}int MainWindow::setTreeItem()
{QFont font(黑体,16);//创建一级父类项QTreeWidgetItem *item_parent new QTreeWidgetItem(ui-m_treeWidget);item_parent-setSizeHint(0,QSize(C_WIDTH,C_HEIGHT));item_parent-setIcon(0,QIcon(:/new/prefix1/picture/Down.png));//设置一列数据ui-m_treeWidget-setColumnCount(1);item_parent-setFont(0,font);item_parent-setText(0,QString::fromLocal8Bit(设备信息));//设置对齐方式item_parent-setTextAlignment(0,Qt::AlignVCenter);addChildItem(item_parent);//所选项的展开与收缩信号connect(ui-m_treeWidget,SIGNAL(itemExpanded(QTreeWidgetItem *)),this,SLOT(On_DouClickedTreeOpen_Slots(QTreeWidgetItem *)));connect(ui-m_treeWidget,SIGNAL(itemCollapsed(QTreeWidgetItem *)),this,SLOT(On_DouClickedTreeClose_Slots(QTreeWidgetItem *)));connect(ui-m_treeWidget,SIGNAL(currentItemChanged(QTreeWidgetItem *, QTreeWidgetItem *)),this,SLOT(On_CurrentItemChanged_Slots(QTreeWidgetItem *,QTreeWidgetItem *)));connect(ui-m_treeWidget,SIGNAL(itemActivated(QTreeWidgetItem *, int)),this,SLOT(On_ItemActivated_Slots(QTreeWidgetItem *,int)));connect(ui-m_treeWidget,SIGNAL(itemChanged(QTreeWidgetItem *, int)),this,SLOT(On_ItemChanged_Slot(QTreeWidgetItem *,int)));//itemClickedconnect(ui-m_treeWidget,SIGNAL(itemClicked(QTreeWidgetItem *, int)),this,SLOT(On_ItemClicked_Slots(QTreeWidgetItem *,int)));connect(ui-m_treeWidget,SIGNAL(itemDoubleClicked(QTreeWidgetItem *, int)),this,SLOT(On_ItemDoubleClicked_Slots(QTreeWidgetItem *,int)));connect(ui-m_treeWidget,SIGNAL(itemPressed(QTreeWidgetItem *, int)),this,SLOT(On_ItemPressed_Slots(QTreeWidgetItem *,int)));connect(ui-m_treeWidget,SIGNAL(itemSelectionChanged()),this,SLOT(On_ItemSelectionChanged_Slots()));return 0;
}/*** brief MainWindow::addChildItem 添加二级子项* param parentItem*/
void MainWindow::addChildItem(QTreeWidgetItem *parentItem)
{//添加二级项为了是效果更加明显多添加几个子节点for(int i 0;i 6;i){QTreeWidgetItem *item_child new QTreeWidgetItem(parentItem);//itemActivateditem_child-setSizeHint(0,QSize(C_WIDTH,C_HEIGHT));item_child-setIcon(0,QIcon(:/new/prefix1/picture/AP.png));item_child-setTextAlignment(0,Qt::AlignLeft | Qt::AlignVCenter);QString test_str QString::fromLocal8Bit(设备_);test_str.append(QString::number(i));item_child-setText(0,test_str);QTreeWidgetItem *item_child_child new QTreeWidgetItem(item_child);item_child_child-setSizeHint(0,QSize(C_WIDTH,C_HEIGHT));item_child_child-setTextAlignment(0,Qt::AlignLeft | Qt::AlignVCenter);//item_child-setIcon(0,QIcon(:/new/prefix1/picture/AP.png));item_child_child-setText(0,QString::fromLocal8Bit(信息));}
}void MainWindow::On_ItemSelectionChanged_Slots()
{qDebug()QString::fromLocal8Bit(当前项发生改变);
}void MainWindow::On_DouClickedTreeClose_Slots(QTreeWidgetItem *item)
{if(item-text(0) QString::fromLocal8Bit(设备信息)){item-setIcon(0,QIcon(:/new/prefix1/picture/Down.png));//回复默认宽高ui-m_treeWidget-setFixedSize(T_WIDTH,T_HEIGHT);}
}void MainWindow::On_ItemActivated_Slots(QTreeWidgetItem *item, int n)
{//qDebug()item-text(0)n;
}void MainWindow::On_ItemChanged_Slot(QTreeWidgetItem *item, int n)
{qDebug()item-text(0)n;
}void MainWindow::On_ItemClicked_Slots(QTreeWidgetItem *item, int n)
{qDebug()QString::fromLocal8Bit(单击)item-text(0)n;
}void MainWindow::On_ItemDoubleClicked_Slots(QTreeWidgetItem *item, int n)
{qDebug()QString::fromLocal8Bit(双击)item-text(0)n;
}void MainWindow::On_ItemPressed_Slots(QTreeWidgetItem *item, int n)
{qDebug()QString::fromLocal8Bit(按下)item-text(0)n;
}void MainWindow::On_CurrentItemChanged_Slots(QTreeWidgetItem *curren, QTreeWidgetItem *previous)
{//这里做判断是防止代码初始化时出错因为初始化时previous NULL// if(previous ! NULL)// qDebug()curren-text(0)previous-text(0);
}void MainWindow::On_DouClickedTreeOpen_Slots(QTreeWidgetItem *item)
{if(item-text(0) QString::fromLocal8Bit(设备信息)){item-setIcon(0,QIcon(:/new/prefix1/picture/Up.png));//根据子节点数目更新宽度int num item-childCount();if(num 0){int h num * C_HEIGHT T_HEIGHT;ui-m_treeWidget-setFixedSize(T_WIDTH,h);}}}
