func_image.cpp

#include "func_image.h"
#include "ui_func_image.h"
#include <QDir>
#include <QFileInfo>
#include <QListWidgetItem>
#include <QPixmap>
#include <QToolBar>
#include <QAction>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QPushButton>
#include <QStatusBar>
#include <QWheelEvent>

func_image::func_image(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::func_image),
    scaleFactor(1.0),
    rotationAngle(0)
{
    ui->setupUi(this);

// 初始化列表和显示区域
   listWidget = new QListWidget(this);
   imageLabel = new QLabel(this);
   imageLabel->setAlignment(Qt::AlignCenter);
   imageLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
   imageLabel->setScaledContents(false);

   // 初始化工具栏
   toolBar = new QToolBar(this);
   QAction *zoomInAction = toolBar->addAction("Zoom In");
   QAction *zoomOutAction = toolBar->addAction("Zoom Out");
   QAction *rotateLeftAction = toolBar->addAction("Rotate Left");
   QAction *rotateRightAction = toolBar->addAction("Rotate Right");

   // 连接工具栏按钮的信号与槽
   connect(zoomInAction, &QAction::triggered, this, &func_image::zoomIn);
   connect(zoomOutAction, &QAction::triggered, this, &func_image::zoomOut);
   connect(rotateLeftAction, &QAction::triggered, this, &func_image::rotateLeft);
   connect(rotateRightAction, &QAction::triggered, this, &func_image::rotateRight);

   // 左右图片切换按钮
   QPushButton *prevButton = new QPushButton("<", this);
   QPushButton *nextButton = new QPushButton(">", this);
   prevButton->setFixedSize(50, 50);
   nextButton->setFixedSize(50, 50);

   connect(prevButton, &QPushButton::clicked, this, &func_image::showPreviousImage);
   connect(nextButton, &QPushButton::clicked, this, &func_image::showNextImage);

   // 状态栏用于显示当前文件名和图片序号
   QStatusBar *statusBar = new QStatusBar(this);
   statusBar->setSizeGripEnabled(false);  // 禁止调整窗口大小
   QLabel *statusLabel = new QLabel(this);
   statusBar->addWidget(statusLabel);

   // 布局
   QVBoxLayout *mainLayout = new QVBoxLayout(this);
   QHBoxLayout *imageLayout = new QHBoxLayout();
   QHBoxLayout *bottomLayout = new QHBoxLayout();

   // 添加工具栏到主布局
   mainLayout->addWidget(toolBar);

   // 设置图片显示区布局
   imageLayout->addWidget(prevButton);
   imageLayout->addWidget(imageLabel);
   imageLayout->addWidget(nextButton);
   mainLayout->addLayout(imageLayout);

   // 缩略图列表在底部
   bottomLayout->addWidget(listWidget);
   mainLayout->addLayout(bottomLayout);

   // 添加状态栏
   mainLayout->addWidget(statusBar);

   setLayout(mainLayout);

   // 加载图片
   loadImages();

   // 连接列表点击信号
   connect(listWidget, &QListWidget::itemClicked, this, &func_image::showImage);

   // 设置初始状态栏文本
   statusLabel->setText("当前文件名： 无");
}

func_image::~func_image()
{
   delete ui;
}

void func_image::loadImages()
{
   QDir directory("/home/user/桌面/test");  // 替换为实际的图像文件夹路径
   QStringList images = directory.entryList(QStringList() << "*.jpg" << "*.png", QDir::Files);
   foreach(QString filename, images) {
       QListWidgetItem *item = new QListWidgetItem(QIcon(directory.path() + "/" + filename), filename);
       item->setData(Qt::UserRole, directory.path() + "/" + filename);  // 保存图像路径
       listWidget->addItem(item);
   }
}

void func_image::showImage(QListWidgetItem *item)
{
   QString imagePath = item->data(Qt::UserRole).toString();
   originalPixmap.load(imagePath);

   scaleFactor = 1.0;
   rotationAngle = 0;

   imageLabel->setPixmap(originalPixmap.scaled(imageLabel->size(), Qt::KeepAspectRatio));

   // 更新状态栏
   QLabel *statusLabel = findChild<QStatusBar *>()->findChild<QLabel *>();
   if (statusLabel) {
       int currentIndex = listWidget->currentRow() + 1;
       int totalImages = listWidget->count();
       statusLabel->setText(QString("当前文件名: %1    第%2/%3张").arg(imagePath).arg(currentIndex).arg(totalImages));
   }
}

void func_image::showNextImage()
{
   int currentIndex = listWidget->currentRow();
   if (currentIndex < listWidget->count() - 1) {
       listWidget->setCurrentRow(currentIndex + 1);
       showImage(listWidget->currentItem());
   }
}

void func_image::showPreviousImage()
{
   int currentIndex = listWidget->currentRow();
   if (currentIndex > 0) {
       listWidget->setCurrentRow(currentIndex - 1);
       showImage(listWidget->currentItem());
   }
}

void func_image::zoomIn()
{
// 获取当前显示图片的尺寸
    QSize currentSize = imageLabel->pixmap()->size();
    QSize newSize = currentSize * 1.25;

    // 限制最大放大倍数为原始图片的4倍
    if (newSize.width() <= originalPixmap.size().width() * 4 &&
        newSize.height() <= originalPixmap.size().height() * 4) {
        imageLabel->setPixmap(originalPixmap.scaled(newSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
    } else {
        // 如果超出限制，则使用最大允许大小
        newSize = originalPixmap.size() * 4;
        imageLabel->setPixmap(originalPixmap.scaled(newSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
    }
}

void func_image::zoomOut()
{
// 获取当前显示图片的尺寸
   QSize currentSize = imageLabel->pixmap()->size();
   QSize newSize = currentSize * 0.8;
   imageLabel->setPixmap(originalPixmap.scaled(newSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
}

void func_image::rotateLeft()
{
   rotationAngle -= 90;
   QTransform transform;
   transform.rotate(rotationAngle);
   QPixmap rotatedPixmap = originalPixmap.transformed(transform, Qt::SmoothTransformation);
   imageLabel->setPixmap(rotatedPixmap.scaled(imageLabel->size(), Qt::KeepAspectRatio));
}

void func_image::rotateRight()
{
   rotationAngle += 90;
   QTransform transform;
   transform.rotate(rotationAngle);
   QPixmap rotatedPixmap = originalPixmap.transformed(transform, Qt::SmoothTransformation);
   imageLabel->setPixmap(rotatedPixmap.scaled(imageLabel->size(), Qt::KeepAspectRatio));
}
void func_image::wheelEvent(QWheelEvent *event)
{
    if (event->angleDelta().y() > 0) {
        // 向上滚动，放大图片
        zoomIn();
    } else {
        // 向下滚动，缩小图片
        zoomOut();
    }
}