SignalXReviselayout->addItem(new QSpacerItem(1,1,QSizePolicy::Expanding,QSizePolicy::Minimum),0,5,1,1);说明
时间: 2023-10-03 16:07:31 浏览: 45
这行代码使用了Qt中的布局管理器QGridLayout,将一个QSpacerItem添加到了SignalXReviselayout中的第0行第5列,并且占据1行1列的空间。QSpacerItem是一个空白项,可以用于调整布局中的空间分配,这里的参数指定了它的最小尺寸和在水平和垂直方向上的扩展策略。具体来说,1和1表示它的最小宽度和高度都为1个像素,QSizePolicy::Expanding和QSizePolicy::Minimum分别表示在水平方向上可以扩展,但是在垂直方向上只占用最小空间。因此,这个QSpacerItem会占据一定的水平空间,但是在垂直方向上不会影响其他控件的布局。
相关问题
verticalLayout->addWidget(groupBox); txtEdit = new QPlainTextEdit(QWDialog); txtEdit->setObjectName(QString::fromUtf8("txtEdit")); QFont font1; font1.setPointSize(20); txtEdit->setFont(font1); verticalLayout->addWidget(txtEdit); verticalSpacer = new QSpacerItem(20, 40, QSizePolicy::Minimum, QSizePolicy::Expanding); verticalLayout->addItem(verticalSpacer); horizontalLayout = new QHBoxLayout(); horizontalLayout->setSpacing(6); horizontalLayout->setObjectName(QString::fromUtf8("horizontalLayout")); horizontalSpacer_2 = new QSpacerItem(40, 20, QSizePolicy::Expanding, QSizePolicy::Minimum); horizontalLayout->addItem(horizontalSpacer_2); btnOK = new QPushButton(QWDialog); btnOK->setObjectName(QString::fromUtf8("btnOK")); horizontalLayout->addWidget(btnOK); btnCancel = new QPushButton(QWDialog); btnCancel->setObjectName(QString::fromUtf8("btnCancel")); horizontalLayout->addWidget(btnCancel); horizontalSpacer = new QSpacerItem(40, 20, QSizePolicy::Expanding, QSizePolicy::Minimum); horizontalLayout->addItem(horizontalSpacer); btnClose = new QPushButton(QWDialog); btnClose->setObjectName(QString::fromUtf8("btnClose")); horizontalLayout->addWidget(btnClose); verticalLayout->addLayout(horizontalLayout); retranslateUi(QWDialog); QObject::connect(btnOK, SIGNAL(clicked()), QWDialog, SLOT(accept())); QObject::connect(btnCancel, SIGNAL(clicked()), QWDialog, SLOT(reject())); QObject::connect(btnClose, SIGNAL(clicked()), QWDialog, SLOT(close())); QMetaObject::connectSlotsByName(QWDialog);将以上的每一行代码都进行详细的注释,并且每一行注释都要加//
//将groupBox添加到垂直布局中
verticalLayout->addWidget(groupBox);
//创建一个QPlainTextEdit对象,命名为txtEdit,并将字体大小设置为20
txtEdit = new QPlainTextEdit(QWDialog);
txtEdit->setObjectName(QString::fromUtf8("txtEdit"));
QFont font1;
font1.setPointSize(20);
txtEdit->setFont(font1);
//将txtEdit添加到垂直布局中
verticalLayout->addWidget(txtEdit);
//创建一个垂直方向的spacer,使得界面可以自适应大小
verticalSpacer = new QSpacerItem(20, 40, QSizePolicy::Minimum, QSizePolicy::Expanding);
verticalLayout->addItem(verticalSpacer);
//创建一个水平布局
horizontalLayout = new QHBoxLayout();
horizontalLayout->setSpacing(6);
horizontalLayout->setObjectName(QString::fromUtf8("horizontalLayout"));
//创建一个水平方向的spacer,使得按钮可以自适应大小
horizontalSpacer_2 = new QSpacerItem(40, 20, QSizePolicy::Expanding, QSizePolicy::Minimum);
horizontalLayout->addItem(horizontalSpacer_2);
//创建一个名为btnOK的QPushButton对象
btnOK = new QPushButton(QWDialog);
btnOK->setObjectName(QString::fromUtf8("btnOK"));
//将btnOK添加到水平布局中
horizontalLayout->addWidget(btnOK);
//创建一个名为btnCancel的QPushButton对象
btnCancel = new QPushButton(QWDialog);
btnCancel->setObjectName(QString::fromUtf8("btnCancel"));
//将btnCancel添加到水平布局中
horizontalLayout->addWidget(btnCancel);
//创建一个水平方向的spacer,使得按钮可以自适应大小
horizontalSpacer = new QSpacerItem(40, 20, QSizePolicy::Expanding, QSizePolicy::Minimum);
horizontalLayout->addItem(horizontalSpacer);
//创建一个名为btnClose的QPushButton对象
btnClose = new QPushButton(QWDialog);
btnClose->setObjectName(QString::fromUtf8("btnClose"));
//将btnClose添加到水平布局中
horizontalLayout->addWidget(btnClose);
//将水平布局添加到垂直布局中
verticalLayout->addLayout(horizontalLayout);
//重新翻译UI界面
retranslateUi(QWDialog);
//将btnOK的clicked()信号连接到QWDialog的accept()槽函数
QObject::connect(btnOK, SIGNAL(clicked()), QWDialog, SLOT(accept()));
//将btnCancel的clicked()信号连接到QWDialog的reject()槽函数
QObject::connect(btnCancel, SIGNAL(clicked()), QWDialog, SLOT(reject()));
//将btnClose的clicked()信号连接到QWDialog的close()槽函数
QObject::connect(btnClose, SIGNAL(clicked()), QWDialog, SLOT(close()));
//连接所有未连接的信号和槽函数
QMetaObject::connectSlotsByName(QWDialog);
view->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);设置完之后还是有空白
如果仍然存在空白,可能是因为父窗口的布局方式或其他控件的布局方式导致的。在这种情况下,可以使用QSpacerItem来填充空白。
以下是一个示例代码:
```cpp
#include <QGraphicsView>
#include <QGridLayout>
#include <QWidget>
#include <QSpacerItem>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
// Create a QGraphicsView object
QGraphicsView *view = new QGraphicsView();
// Create a QWidget object and set its layout to QGridLayout
QWidget *widget = new QWidget();
QGridLayout *layout = new QGridLayout(widget);
widget->setLayout(layout);
// Add the QGraphicsView to the layout
layout->addWidget(view, 0, 0);
// Add a QSpacerItem to fill the remaining space
QSpacerItem *spacer = new QSpacerItem(0, 0, QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
layout->addItem(spacer, 1, 0);
// Set the widget as the main window
widget->show();
return app.exec();
}
```
在这个示例中,我们添加了一个QSpacerItem来填充剩余空间。QSpacerItem的SizePolicy设置为MinimumExpanding,这样它可以自动扩展以填充空白。另外,我们将QSpacerItem添加到第2行第1列的位置,这样它就可以填充剩余空间。
这样,QGraphicsView就可以占据整个单元格,没有空白了。