widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include

Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
createWidgets();
createConnects();
createEventFilter();
}

Widget::~Widget()
{
delete ui;

delete quit;
delete mini;
delete restore;
delete menu;
delete trayIcon;

delete fullScreenLabel;
delete shotScreenLabel;
}

bool Widget::eventFilter(QObject *o, QEvent *e)
{
if (o != fullScreenLabel)
{
return Widget::eventFilter(o, e);
}

QMouseEvent *mouseEvent = static_cast (e);

//true 鼠标左键按下且按键还未弹起
if ((mouseEvent->button() == Qt::LeftButton)
&& (mouseEvent->type() == QEvent::MouseButtonPress))
{
//鼠标左键标志位按下
leftMousePress = true;

//获取鼠标点
origin = mouseEvent->pos();

if (!rubberBand)
{
rubberBand = new QRubberBand(QRubberBand::Rectangle, fullScreenLabel);
}

rubberBand->setGeometry(QRect(origin,QSize()));
rubberBand->show();

return true;
}

//true 鼠标左键按下并拖动
if ((mouseEvent->type() == QEvent::MouseMove)
&& (leftMousePress))
{
if (rubberBand)
{
rubberBand->setGeometry(QRect(origin, mouseEvent->pos()).normalized());
}

return true;
}

//鼠标左键松开
if ((mouseEvent->button() == Qt::LeftButton)
&& (mouseEvent->type() == QEvent::MouseButtonRelease))
{
//鼠标标志位弹起
leftMousePress = false;

if (rubberBand)
{
//获取橡皮筋框的终止坐标
termination = mouseEvent->pos();
QRect rect = QRect(origin, termination);

//根据橡皮筋框截取全屏上的信息，并将其放入shotScreenLabel
shotScreenLabel->setPixmap(fullScreenPixmap.grabWidget(fullScreenLabel,
rect.x(),
rect.y(),
rect.width(),
rect.height()));

//将shotScreenLabel的用户区大小固定为所截图片大小
shotScreenLabel->setFixedSize(rect.width(), rect.height());
shotScreenLabel->show();

rubberBand->hide();
fullScreenLabel->hide();
}

return true;
}

return false;
}

/**
descr：实例化控件
*/
void Widget::createWidgets()
{
//两个QLabel的父控件不能为this，否则截图信息会现在是主窗口中，无法正确显示
fullScreenLabel = new QLabel();
shotScreenLabel = new QLabel();

rubberBand = new QRubberBand(QRubberBand::Rectangle, fullScreenLabel);

leftMousePress = false;

//初始化托盘控件并组装**************************************************************

trayIcon = new QSystemTrayIcon(QIcon(tr(":/images/heart.svg")), this);
menu = new QMenu(this);
restore = new QAction(tr("Restore"), this);
mini = new QAction(tr("Mini"), this);
quit = new QAction(tr("Quit"), this);

menu->addAction(restore);
menu->addAction(mini);
menu->addAction(quit);
trayIcon->setContextMenu(menu);

//将托盘显示
trayIcon->show();

//初始化托盘控件并组装**************************************************************

savePixmap = new QAction(tr("save"), shotScreenLabel);