Qt 实现被鼠标悬浮的图片放大显示

简述

效果图

源码

类的创建

头文件

// 文件名 QtGuiApplication1.h
#pragma once

#include <QtWidgets/QMainWindow>
#include "ui_QtGuiApplication1.h"
#include <QImage>
class QLabel;

class QtGuiApplication1 : public QMainWindow
{
Q_OBJECT

public:
QtGuiApplication1(QWidget *parent = Q_NULLPTR);
protected:
// Event handlers
virtual void mousePressEvent(QMouseEvent *event);
virtual void mouseReleaseEvent(QMouseEvent *event);
virtual void mouseDoubleClickEvent(QMouseEvent *event);
virtual void mouseMoveEvent(QMouseEvent *event);
private:
Ui::QtGuiApplication1Class ui;
QLabel *mouseStatus;

QImage *img1;
QImage *img2;
QImage *img3;

bool scaleEnable1;
bool scaleEnable2;
bool scaleEnable3;

};

源文件

// 文件名 QtGuiApplication1.cpp

#include "QtGuiApplication1.h"
#include <QMouseEvent>
#include <QLabel>
#include <QPixmap>
#include <QMatrix>

QtGuiApplication1::QtGuiApplication1(QWidget *parent)
: QMainWindow(parent)
{
ui.setupUi(this);
setWindowTitle(QStringLiteral("鼠标事件"));
centralWidget()->setMouseTracking(true);
setMouseTracking(true);
ui.label_1->setMouseTracking(true);
ui.label_2->setMouseTracking(true);
ui.label_3->setMouseTracking(true);

mouseStatus = new QLabel;
statusBar()->addPermanentWidget(mouseStatus);

img1 = new QImage;
img2 = new QImage;
img3 = new QImage;
img1->load(":/goal/resource/KuiBeiKe.jpg");
img2->load(":/goal/resource/treeRoad.jpg");
img3->load(":/goal/resource/KuiBeiKe.jpg");

ui.label_1->setPixmap(QPixmap::fromImage(*img1));
ui.label_1->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
ui.label_2->setPixmap(QPixmap::fromImage(*img2));
ui.label_2->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
ui.label_3->setPixmap(QPixmap::fromImage(*img3));
ui.label_3->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);

scaleEnable1 = true;
scaleEnable2 = true;
scaleEnable3 = true;
}

void QtGuiApplication1::mousePressEvent(QMouseEvent *event)
{
QString str = "X:" + QString::number(event->x()) + "  Y:" + QString::number(event->y());

switch (event->button())
{
case Qt::LeftButton:
str = QStringLiteral("左键: ") + str;
break;
case Qt::RightButton:
str = QStringLiteral("右键: ") + str;
break;
case Qt::MidButton:
str = QStringLiteral("中键: ") + str;
break;
default:
break;
}

mouseStatus->setText(str);
}

void QtGuiApplication1::mouseReleaseEvent(QMouseEvent *event)
{

}

void QtGuiApplication1::mouseDoubleClickEvent(QMouseEvent *event)
{

}

void QtGuiApplication1::mouseMoveEvent(QMouseEvent *event)
{
QString str = "X:" + QString::number(event->x()) + "  Y:" + QString::number(event->y());
statusBar()->showMessage(str);

int x = event->x();

if (x > 70 && x<124)
{
QMatrix matrix;
matrix.scale(1, 1);
if (scaleEnable1)
{
ui.label_1->setFixedHeight(250);
ui.label_1->setFixedWidth(157);
scaleEnable1 = false;
}
if (!scaleEnable2)
{
ui.label_2->setFixedHeight(54);
ui.label_2->setFixedWidth(61);
scaleEnable2 = true;
}
if (!scaleEnable3)
{
ui.label_3->setFixedHeight(54);
ui.label_3->setFixedWidth(61);
scaleEnable3 = true;
}
}
else if (x > 270 && x<324)
{
if (scaleEnable2)
{
ui.label_2->setFixedHeight(250);
ui.label_2->setFixedWidth(157);
scaleEnable2 = false;
}
if (!scaleEnable1)
{
ui.label_1->setFixedHeight(54);
ui.label_1->setFixedWidth(61);
scaleEnable1 = true;
}
if (!scaleEnable3)
{
ui.label_3->setFixedHeight(54);
ui.label_3->setFixedWidth(61);
scaleEnable3 = true;
}
}
else if (x > 430 && x < 484)
{
if (scaleEnable3)
{
ui.label_3->setFixedHeight(250);
ui.label_3->setFixedWidth(157);
scaleEnable3 = false;
}
if (!scaleEnable1)
{
ui.label_1->setFixedHeight(54);
ui.label_1->setFixedWidth(61);
scaleEnable1 = true;
}
if (!scaleEnable2)
{
ui.label_2->setFixedHeight(54);
ui.label_2->setFixedWidth(61);
scaleEnable2 = true;
}
}

}

界面文件

类的使用

#include "QtGuiApplication1.h"
#include <QtWidgets/QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QtGuiApplication1 w;
w.show();
return a.exec();
}

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