[英]Qt, a simple connection between two QWidget objects
I have one class that inherits from QMainWindow and two that inherits from QWidget. 我有一个从QMainWindow继承的类,还有两个从QWidget继承的类。 I added this two QWidget objects into my QMainWindow object and i wanted to create a connection between this two QWidget object(one of them contains QPushButton object).
我将这两个QWidget对象添加到我的QMainWindow对象中,并且希望在这两个QWidget对象之间创建连接(其中一个包含QPushButton对象)。 unfortunately, doesn't want to work...
不幸的是,不想工作...
CODE: 码:
MAINFRAME: 主框架:
#ifndef MAINFRAME_H
#define MAINFRAME_H
#include <QtGui/QMainWindow>
#include "DrawComponent.h"
#include "ControllComponent.h"
class MainFrame : public QMainWindow
{
Q_OBJECT
public:
DrawComponent *dComponent;
ControllComponent *cComponent;
MainFrame();
};
#endif
#include "MainFrame.h"
#include "DrawComponent.h"
#include "ControllComponent.h"
#include <iostream>
using namespace std;
MainFrame :: MainFrame()
{
this->setGeometry(100, 100, 640, 480);
this->dComponent = new DrawComponent(this);
this->cComponent = new ControllComponent(this);
QObject::connect(this->cComponent->rysuj1, SIGNAL(clicked()), this, SLOT(dComponent->draw1));
}
FIRST QWidget class 第一个QWidget类
#ifndef DRAWCOMPONENT_H
#define DRAWCOMPONENT_H
#include <QtGui/QMainWindow>
#include <qwidget.h>
class DrawComponent : public QWidget
{
Q_OBJECT
public:
DrawComponent(QMainWindow *parent);
public slots:
void draw1();
};
#endif
#include "DrawComponent.h"
#include <qpushbutton.h>
#include <qgridlayout.h>
using namespace std;
DrawComponent :: DrawComponent(QMainWindow *parent)
{
this->setParent(parent);
this->setGeometry(0, 0, 500, 480);
QPalette p(palette());
p.setColor(QPalette::Background, Qt::black);
this->setPalette(p);
this->setAutoFillBackground(true);
this->show();
}
void DrawComponent :: draw1()
{
QPalette p(palette());
p.setColor(QPalette::Background, Qt::blue);
this->setPalette(p);
}
SECOND QWidget class 第二个QWidget类
#ifndef CONTROLLCOMPONENT_H
#define CONTROLLCOMPONENT_H
#include <QtGui/QMainWindow>
#include <qwidget.h>
#include <qpushbutton.h>
class ControllComponent : public QWidget
{
Q_OBJECT
public:
QPushButton *rysuj1;
ControllComponent(QMainWindow *parent);
};
#endif
#include "ControllComponent.h"
#include <qpushbutton.h>
#include <qgridlayout.h>
ControllComponent :: ControllComponent(QMainWindow *parent)
{
this->setParent(parent);
this->setGeometry(500, 0, 140, 480);
QPalette p(palette());
p.setColor(QPalette::Background, Qt::red);
this->setPalette(p);
this->setAutoFillBackground(true);
this->rysuj1 = new QPushButton(tr("draw1"), this);
this->rysuj1->setGeometry(45, 10, 50, 50);
this->rysuj1->show();
this->show();
}
Your call to connect the clicked()
signal from rysuj1
to the draw1()
slot of dComponent
您将
rysuj1
的clicked()
信号连接到rysuj1
的draw1()
插槽的dComponent
QObject::connect(this->cComponent->rysuj1, SIGNAL(clicked()),
this, SLOT(dComponent->draw1));
needs to be 需要是
QObject::connect(this->cComponent->rysuj1, SIGNAL(clicked()),
dComponent, SLOT(draw1()));
dComponent->draw1
is not a slot 不是插槽
see Here: 看这里:
QObject::connect(&a, SIGNAL(valueChanged(int)),
&b, SLOT(setValue(int)));
arguments: 1. object, 2. Signal-function, 3. an object, 4. a slot function. 参数:1.对象,2.信号功能,3.对象,4.插槽功能。
so 所以
QObject::connect(this->cComponent->rysuj1, SIGNAL(clicked()), dComponent, SLOT(draw1()));
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