263 lines
8.9 KiB
C++
263 lines
8.9 KiB
C++
#include "DialogImageViewer.h"
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#include <QVBoxLayout>
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#include <QHBoxLayout>
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#include <QPushButton>
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#include <QScrollBar>
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#include <QKeyEvent>
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#include <QApplication>
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#include <QScreen>
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DialogImageViewer::DialogImageViewer(QWidget* parent)
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: QDialog(parent)
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{
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setupUI();
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}
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DialogImageViewer::~DialogImageViewer()
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{
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}
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void DialogImageViewer::setupUI()
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{
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// 设置窗口属性
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setWindowTitle(QString::fromUtf8("图像查看"));
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setWindowFlags(Qt::Dialog | Qt::WindowMaximizeButtonHint | Qt::WindowCloseButtonHint);
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setStyleSheet("background-color: rgb(25, 26, 28);");
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// 获取屏幕大小，设置窗口为屏幕的80%
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QScreen* screen = QApplication::primaryScreen();
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QRect screenGeometry = screen->availableGeometry();
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int width = screenGeometry.width() * 0.8;
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int height = screenGeometry.height() * 0.8;
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resize(width, height);
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// 主布局
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QVBoxLayout* mainLayout = new QVBoxLayout(this);
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mainLayout->setContentsMargins(10, 10, 10, 10);
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mainLayout->setSpacing(10);
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// 滚动区域
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m_scrollArea = new QScrollArea(this);
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m_scrollArea->setWidgetResizable(false);
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m_scrollArea->setAlignment(Qt::AlignCenter);
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m_scrollArea->setStyleSheet(
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"QScrollArea { background-color: rgb(38, 40, 47); border: none; }"
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"QScrollBar:vertical { background-color: rgb(38, 40, 47); width: 12px; }"
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"QScrollBar::handle:vertical { background-color: rgb(80, 82, 88); border-radius: 6px; min-height: 20px; }"
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"QScrollBar::add-line:vertical, QScrollBar::sub-line:vertical { height: 0px; }"
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"QScrollBar:horizontal { background-color: rgb(38, 40, 47); height: 12px; }"
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"QScrollBar::handle:horizontal { background-color: rgb(80, 82, 88); border-radius: 6px; min-width: 20px; }"
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"QScrollBar::add-line:horizontal, QScrollBar::sub-line:horizontal { width: 0px; }"
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);
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// 图像标签
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m_imageLabel = new QLabel(m_scrollArea);
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m_imageLabel->setAlignment(Qt::AlignCenter);
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m_imageLabel->setStyleSheet("background-color: rgb(38, 40, 47);");
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m_imageLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
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m_imageLabel->setScaledContents(false);
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m_scrollArea->setWidget(m_imageLabel);
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mainLayout->addWidget(m_scrollArea, 1);
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// 底部信息栏
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QHBoxLayout* bottomLayout = new QHBoxLayout();
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bottomLayout->setSpacing(20);
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m_infoLabel = new QLabel(this);
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m_infoLabel->setStyleSheet("QLabel { color: rgb(180, 180, 180); font-size: 14px; }");
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m_infoLabel->setText(QString::fromUtf8("滚轮缩放 | 拖拽平移 | 双击还原 | ESC退出"));
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bottomLayout->addWidget(m_infoLabel);
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bottomLayout->addStretch();
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// 关闭按钮
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QPushButton* btnClose = new QPushButton(QString::fromUtf8("关闭"), this);
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btnClose->setFixedSize(100, 35);
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btnClose->setStyleSheet(
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"QPushButton { background-color: rgb(60, 62, 68); color: rgb(221, 225, 233); "
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"border: 1px solid rgb(80, 82, 88); border-radius: 5px; font-size: 14px; }"
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"QPushButton:hover { background-color: rgb(80, 82, 88); }"
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"QPushButton:pressed { background-color: rgb(50, 52, 58); }"
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);
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connect(btnClose, &QPushButton::clicked, this, &QDialog::close);
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bottomLayout->addWidget(btnClose);
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mainLayout->addLayout(bottomLayout);
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// 设置焦点策略以接收键盘事件
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setFocusPolicy(Qt::StrongFocus);
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}
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void DialogImageViewer::setImage(const QImage& image, const QString& title)
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{
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m_originalImage = image;
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m_scaleFactor = 1.0;
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if (!title.isEmpty()) {
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setWindowTitle(QString::fromUtf8("图像查看 - %1").arg(title));
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}
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// 计算初始缩放比例，使图像适应窗口
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if (!m_originalImage.isNull()) {
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QSize viewSize = m_scrollArea->viewport()->size();
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double scaleX = static_cast<double>(viewSize.width() - 20) / m_originalImage.width();
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double scaleY = static_cast<double>(viewSize.height() - 20) / m_originalImage.height();
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m_scaleFactor = qMin(scaleX, scaleY);
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m_scaleFactor = qMax(m_scaleFactor, MIN_SCALE);
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m_scaleFactor = qMin(m_scaleFactor, 1.0); // 初始不放大超过100%
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}
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updateImageDisplay();
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}
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void DialogImageViewer::updateImageDisplay()
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{
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if (m_originalImage.isNull()) {
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m_imageLabel->setText(QString::fromUtf8("无图像"));
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return;
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}
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// 计算缩放后的尺寸
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int newWidth = static_cast<int>(m_originalImage.width() * m_scaleFactor);
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int newHeight = static_cast<int>(m_originalImage.height() * m_scaleFactor);
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// 缩放图像
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QImage scaledImage = m_originalImage.scaled(newWidth, newHeight,
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Qt::KeepAspectRatio,
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Qt::SmoothTransformation);
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m_imageLabel->setPixmap(QPixmap::fromImage(scaledImage));
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m_imageLabel->resize(scaledImage.size());
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// 更新信息标签
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QString info = QString::fromUtf8("缩放: %1% | 尺寸: %2x%3 | 滚轮缩放 | 拖拽平移 | 双击还原")
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.arg(static_cast<int>(m_scaleFactor * 100))
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.arg(m_originalImage.width())
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.arg(m_originalImage.height());
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m_infoLabel->setText(info);
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}
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void DialogImageViewer::resetZoom()
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{
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if (m_originalImage.isNull()) return;
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// 重置为适应窗口的缩放比例
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QSize viewSize = m_scrollArea->viewport()->size();
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double scaleX = static_cast<double>(viewSize.width() - 20) / m_originalImage.width();
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double scaleY = static_cast<double>(viewSize.height() - 20) / m_originalImage.height();
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m_scaleFactor = qMin(scaleX, scaleY);
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m_scaleFactor = qMax(m_scaleFactor, MIN_SCALE);
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updateImageDisplay();
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// 居中显示
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m_scrollArea->horizontalScrollBar()->setValue(
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(m_imageLabel->width() - m_scrollArea->viewport()->width()) / 2);
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m_scrollArea->verticalScrollBar()->setValue(
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(m_imageLabel->height() - m_scrollArea->viewport()->height()) / 2);
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}
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void DialogImageViewer::wheelEvent(QWheelEvent* event)
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{
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if (m_originalImage.isNull()) return;
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// 获取滚轮方向
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double delta = event->angleDelta().y() > 0 ? SCALE_STEP : -SCALE_STEP;
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// 计算新的缩放比例
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double newScale = m_scaleFactor + delta;
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newScale = qMax(newScale, MIN_SCALE);
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newScale = qMin(newScale, MAX_SCALE);
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if (qAbs(newScale - m_scaleFactor) > 0.001) {
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// 保存当前滚动位置比例
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QScrollBar* hBar = m_scrollArea->horizontalScrollBar();
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QScrollBar* vBar = m_scrollArea->verticalScrollBar();
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double hRatio = hBar->maximum() > 0 ? static_cast<double>(hBar->value()) / hBar->maximum() : 0.5;
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double vRatio = vBar->maximum() > 0 ? static_cast<double>(vBar->value()) / vBar->maximum() : 0.5;
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m_scaleFactor = newScale;
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updateImageDisplay();
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// 恢复滚动位置比例
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hBar->setValue(static_cast<int>(hRatio * hBar->maximum()));
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vBar->setValue(static_cast<int>(vRatio * vBar->maximum()));
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}
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event->accept();
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}
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void DialogImageViewer::mousePressEvent(QMouseEvent* event)
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{
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if (event->button() == Qt::LeftButton) {
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m_dragging = true;
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m_lastPos = event->pos();
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setCursor(Qt::ClosedHandCursor);
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}
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QDialog::mousePressEvent(event);
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}
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void DialogImageViewer::mouseMoveEvent(QMouseEvent* event)
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{
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if (m_dragging) {
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QPoint delta = event->pos() - m_lastPos;
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m_lastPos = event->pos();
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QScrollBar* hBar = m_scrollArea->horizontalScrollBar();
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QScrollBar* vBar = m_scrollArea->verticalScrollBar();
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hBar->setValue(hBar->value() - delta.x());
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vBar->setValue(vBar->value() - delta.y());
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}
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QDialog::mouseMoveEvent(event);
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}
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void DialogImageViewer::mouseReleaseEvent(QMouseEvent* event)
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{
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if (event->button() == Qt::LeftButton) {
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m_dragging = false;
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setCursor(Qt::ArrowCursor);
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}
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QDialog::mouseReleaseEvent(event);
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}
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void DialogImageViewer::mouseDoubleClickEvent(QMouseEvent* event)
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{
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if (event->button() == Qt::LeftButton) {
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resetZoom();
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}
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QDialog::mouseDoubleClickEvent(event);
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}
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void DialogImageViewer::keyPressEvent(QKeyEvent* event)
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{
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switch (event->key()) {
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case Qt::Key_Escape:
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close();
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break;
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case Qt::Key_Plus:
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case Qt::Key_Equal:
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// 放大
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m_scaleFactor = qMin(m_scaleFactor + SCALE_STEP, MAX_SCALE);
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updateImageDisplay();
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break;
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case Qt::Key_Minus:
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// 缩小
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m_scaleFactor = qMax(m_scaleFactor - SCALE_STEP, MIN_SCALE);
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updateImageDisplay();
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break;
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case Qt::Key_0:
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// 原始大小
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m_scaleFactor = 1.0;
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updateImageDisplay();
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break;
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case Qt::Key_F:
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// 适应窗口
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resetZoom();
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break;
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default:
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QDialog::keyPressEvent(event);
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}
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}
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