我的應用程序使用兩個類,因此有2個類「文件」,第一類顯示按鈕等。第二類繪製矩形,按下按鈕應改變某些矩形的顏色(通過重繪它們)。第二類包含paintEvent方法。該程序編譯罰款,但矩形不顯示,我做了一個測試方法,應該退出應用程序,但也不工作。
頭等艙(一個由main.cpp中調用)不調用paintEvent方法的類
#include "RCcar.h"
#include "renderArea.h"
#include <QPushButton>
#include <QApplication>
RCcar::RCcar()
{
Renderarea = new renderArea;
Renderarea->test();
//Renderarea->update();
exit = new QPushButton("Exit", this);
exit->setGeometry(410, 440, 80, 50);
connect(exit, SIGNAL(released()), QApplication::instance(), SLOT(quit()));
setFixedSize(500, 500);
}
#pragma once
#include <QWidget>
class QPushButton;
class renderArea;
class RCcar : public QWidget
{
Q_OBJECT
public:
RCcar();
private:
QPushButton *exit;
renderArea *Renderarea;
};
這是在課堂上RCcar創建
二等
#include "renderArea.h"
#include <QPainter>
#include <QApplication>
#include <QPushButton>
renderArea::renderArea(QWidget *parent)
: QWidget(parent)
{
setAutoFillBackground(true);
setFixedSize(40, 40);
//this->update();
}
void renderArea::paintEvent(QPaintEvent*) {
QPainter painter(this);
QRect a = QRect(90, 230, 70, 40);
QRect s = QRect(215, 230, 70, 40);
QRect d = QRect(340, 230, 70, 40);
QRect w = QRect(215, 150, 70, 40);
painter.setPen(Qt::black);
painter.drawText(a, Qt::AlignCenter, "a");
painter.drawText(s, Qt::AlignCenter, "s");
painter.drawText(d, Qt::AlignCenter, "d");
painter.drawText(w, Qt::AlignCenter, "w");
painter.drawRect(a);
painter.drawRect(s);
painter.drawRect(d);
painter.drawRect(w);
}
void renderArea::test() {
QApplication::instance()->quit();
}
#pragma once
#include <QWidget>
class QPushButton;
class renderArea : public QWidget
{
Q_OBJECT
public:
enum Keys {w,a,s,d};
renderArea(QWidget *parent=0);
void test();
protected:
void paintEvent(QPaintEvent *event) override;
private:
Keys keys;
QPushButton *button;
};
我在做什麼錯?
感謝
不應該'RCcar'小部件是'renderArea'小部件的父級?也許你應該這樣做? –