用QT实现一个图片阅读器

#include "widget.h" #include <QVBoxLayout> #include <QHBoxLayout> Widget::Widget(QWidget *parent) : QWidget(parent) { lb = new QLabel; lb->setMinimumSize(640, 480); lb->setScaledContents(true); lb->setFocus(); lb->installEventFilter(this); lbt = new QPushButton("<"); rbt = new QPushButton(">"); openbt = new QPushButton("open"); QHBoxLayout *hbox = new QHBoxLayout; hbox->addStretch(); hbox->addWidget(lbt); hbox->addWidget(openbt); hbox->addWidget(rbt); hbox->addStretch(); QVBoxLayout *vbox = new QVBoxLayout; vbox->addWidget(lb); vbox->addLayout(hbox); setLayout(vbox); index = 0; connect(openbt, SIGNAL(clicked(bool)), this, SLOT(openfiles())); connect(lbt, SIGNAL(clicked(bool)), this, SLOT(showl())); connect(rbt, SIGNAL(clicked(bool)), this, SLOT(showr())); } Widget::~Widget() { }