这可以通过在子窗口内的父窗口上安装事件过滤器来完成。
这是我为演示它所做的示例项目:
无标题3.pro:
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = untitled3
TEMPLATE = app
SOURCES += main.cpp\
mainwindow.cpp \
form.cpp
HEADERS += mainwindow.h \
form.h
FORMS += mainwindow.ui \
form.ui
表格.h:
#ifndef FORM_H
#define FORM_H
#include <QDialog>
namespace Ui {
class Form;
}
class Form : public QDialog
{
Q_OBJECT
public:
explicit Form(QWidget *parent = 0);
~Form();
protected:
bool eventFilter(QObject *obj, QEvent *event);
private:
Ui::Form *ui;
};
#endif // FORM_H
表格.cpp:
#include "form.h"
#include "ui_form.h"
Form::Form(QWidget *parent) :
QDialog(parent),
ui(new Ui::Form)
{
ui->setupUi(this);
parentWidget()->installEventFilter(this);
}
Form::~Form()
{
delete ui;
}
bool Form::eventFilter(QObject *obj, QEvent *event)
{
return QObject::eventFilter(obj, event);
}
主窗口.h:
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
class Form;
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private:
Ui::MainWindow *ui;
Form *f;
};
#endif // MAINWINDOW_H
主窗口.cpp:
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "form.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
f = new Form(this);
connect(ui->pushButton, SIGNAL(clicked()), f, SLOT(show()));
}
MainWindow::~MainWindow()
{
delete ui;
}
表单.ui:
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>Form</class>
<widget class="QDialog" name="Form">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>300</height>
</rect>
</property>
<property name="windowTitle">
<string>Dialog</string>
</property>
<widget class="QDialogButtonBox" name="buttonBox">
<property name="geometry">
<rect>
<x>30</x>
<y>240</y>
<width>341</width>
<height>32</height>
</rect>
</property>
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="standardButtons">
<set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
</property>
</widget>
<widget class="QLabel" name="label">
<property name="geometry">
<rect>
<x>190</x>
<y>40</y>
<width>46</width>
<height>13</height>
</rect>
</property>
<property name="text">
<string>zz</string>
</property>
</widget>
</widget>
<resources/>
<connections>
<connection>
<sender>buttonBox</sender>
<signal>accepted()</signal>
<receiver>Form</receiver>
<slot>accept()</slot>
<hints>
<hint type="sourcelabel">
<x>248</x>
<y>254</y>
</hint>
<hint type="destinationlabel">
<x>157</x>
<y>274</y>
</hint>
</hints>
</connection>
<connection>
<sender>buttonBox</sender>
<signal>rejected()</signal>
<receiver>Form</receiver>
<slot>reject()</slot>
<hints>
<hint type="sourcelabel">
<x>316</x>
<y>260</y>
</hint>
<hint type="destinationlabel">
<x>286</x>
<y>274</y>
</hint>
</hints>
</connection>
</connections>
</ui>
主窗口.ui:
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>300</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralWidget">
<widget class="QPushButton" name="pushButton">
<property name="geometry">
<rect>
<x>200</x>
<y>40</y>
<width>75</width>
<height>23</height>
</rect>
</property>
<property name="text">
<string>Push</string>
</property>
</widget>
</widget>
<widget class="QMenuBar" name="menuBar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>21</height>
</rect>
</property>
</widget>
<widget class="QToolBar" name="mainToolBar">
<attribute name="toolBarArea">
<enum>TopToolBarArea</enum>
</attribute>
<attribute name="toolBarBreak">
<bool>false</bool>
</attribute>
</widget>
<widget class="QStatusBar" name="statusBar"/>
</widget>
<layoutdefault spacing="6" margin="11"/>
<resources/>
<connections/>
</ui>
主.cpp:
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
结果是子小部件失去焦点,但始终停留在父小部件的顶部。让我知道它是否是您正在寻找的东西。