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Qt实战之实现图片浏览器
来源：jb51　　时间：2023/3/17 8:57:49　　对本文有异议

图片浏览器逻辑

实现图片浏览器用到了前面几乎所有的知识，包括窗口部件、布局、事件、对象模型与容器类、图形视图、模型/视图编程以及多线程等。大致流程为：首先定义一个图片类,该类包含图片的路径、文件名、文件id以及获取这些变量的函数。然后定义了一个图片数组类，主要包含添加图像以及获取所有图像以及新加入图像的函数。最后通过将图片名字加入到界面左侧QDockWidget部件中的QTreeView中，通过线程将图片的预览加入界面下侧的窗口部件中。最后通过双击可查看完整图片，以及通过滚轮和鼠标等事件来对图片进行一些操作。

效果图

具体实现

utils.h

  1. #ifndef UTILS_H
  2. #define UTILS_H
  3.  
  4. #include<QString>
  5. #include<string>
  6.  
  7. //string to QString
  8. inline QString str2qstr(const std::string& str)
  9. {
  10.     return QString::fromLocal8Bit(str.data());
  11. }
  12.  
  13. //QString to string
  14. inline std::string qstr2str(const QString& qstr)
  15. {
  16.     QByteArray cdata = qstr.toLocal8Bit();
  17.     return std::string(cdata);
  18. }
  19.  
  20.  
  21.  
  22. #endif // UTILS_H

image.h

  1. #ifndef IMAGE_H
  2. #define IMAGE_H
  3. #include<string>
  4. #include<vector>
  5.  
  6. using std::vector;
  7. using std::string;
  8.  
  9. class Image
  10. {
  11. public:
  12.     Image() = default;
  13.     ~Image() = default;
  14.  
  15.     Image(const string& _path,const unsigned& _id):path_(_path),id_(_id){
  16.         //从路径中获取图像名称
  17.         auto pos = path_.find_last_of('\\') +1;
  18.         if(pos == 0)
  19.         {
  20.             pos = path_.find_last_of('/')+1;
  21.         }
  22.         name_ = path_.substr(pos,path_.length() - pos);
  23.         pos = name_.find_last_of('.');
  24.         name_ = name_.substr(0,pos);
  25.     }
  26.  
  27.     //设置相机所属的id
  28.     void set_cam_id(const unsigned& _id){
  29.         cam_id_ = _id;
  30.     }
  31.  
  32.     //获取路径
  33.     const string& get_path(){
  34.         return path_;
  35.     }
  36.  
  37.     //获取文件名
  38.     const string& get_name(){
  39.         return name_;
  40.     }
  41.     const unsigned &get_id(){
  42.         return id_;
  43.     }
  44.  
  45.     //获取相机id
  46.     const unsigned& get_cam_id(){
  47.         return cam_id_;
  48.     }
  49.  
  50.  
  51. private:
  52.     string path_;
  53.     string name_;
  54.     unsigned id_;
  55.     unsigned cam_id_;
  56. };
  57.  
  58. #endif // IMAGE_H

image_group.h

  1. #ifndef IMAGE_GROUP_H
  2. #define IMAGE_GROUP_H
  3. #include"image.h"
  4.  
  5. class image_group
  6. {
  7. public:
  8.     image_group();
  9.     ~image_group();
  10.  
  11. public:
  12.     bool addImages(const vector<string>& img_paths);
  13.  
  14.     const vector<Image>& GetAllImages();
  15.  
  16.     const vector<Image>& GetNewAddingImages();
  17.  
  18. private:
  19.     //所有图片数组
  20.     vector<Image> all_images_;
  21.  
  22.     //新加入的图片数组
  23.     vector<Image> new_images_;
  24. };
  25.  
  26. #endif // IMAGE_GROUP_H

image_group.cpp

  1. #include "image_group.h"
  2.  
  3. image_group::image_group()
  4. {
  5.  
  6. }
  7.  
  8. image_group::~image_group()
  9. {
  10.  
  11. }
  12.  
  13. bool image_group::addImages(const vector<std::string> &img_paths)
  14. {
  15.     new_images_.clear();
  16.     for(auto& path: img_paths)
  17.     {
  18.         all_images_.emplace_back(path,all_images_.size());
  19.         new_images_.emplace_back(path,all_images_.size());
  20.     }
  21.     return true;
  22. }
  23.  
  24. const vector<Image> &image_group::GetAllImages()
  25. {
  26.     return all_images_;
  27. }
  28.  
  29. const vector<Image> &image_group::GetNewAddingImages()
  30. {
  31.     return new_images_;
  32. }

qimgviewwidget.h

  1. #ifndef QIMGVIEWWIDGET_H
  2. #define QIMGVIEWWIDGET_H
  3.  
  4. #include <QWidget>
  5. #include<QImage>
  6.  
  7.  
  8. //用于显示2D图像的窗口部件
  9. class QImgViewWidget : public QWidget
  10. {
  11.     Q_OBJECT
  12. public:
  13.     explicit QImgViewWidget(QWidget *parent = nullptr);
  14.     ~QImgViewWidget() = default;
  15.  
  16.     //从文件路径加载图片
  17.     void SetImage(const QString& img_path);
  18.  
  19.     void ResetTransform();
  20.  
  21. private:
  22.     //用来展示的image信息
  23.     QImage img_display_;
  24.     //原始pixmap信息
  25.     QPixmap pix_ori_;
  26.     //用来展示的pixmap信息
  27.     QPixmap pix_display_;
  28.     //图片路径
  29.     QString img_path_;
  30.     //鼠标滚轮控制的缩放比例
  31.     float zoom_scale_;
  32.     //由鼠标移动控制的移动
  33.     QPoint move_step_;
  34.     bool move_start_;
  35.     bool is_moving_;
  36.     QPoint mouse_point_;
  37.  
  38. protected:
  39.     void paintEvent(QPaintEvent* event)override;
  40.     void wheelEvent(QWheelEvent* event)override;
  41.     void mousePressEvent(QMouseEvent* event)override;
  42.     void mouseReleaseEvent(QMouseEvent* event)override;
  43.     void mouseMoveEvent(QMouseEvent* event)override;
  44.     void resizeEvent(QResizeEvent* event)override;
  45.  
  46. };
  47.  
  48. #endif // QIMGVIEWWIDGET_H

qimgviewwidget.cpp

  1. #include "qimgviewwidget.h"
  2. #include <QPainter>
  3. #include <QWheelEvent>
  4.  
  5. QImgViewWidget::QImgViewWidget(QWidget *parent) : QWidget(parent)
  6. {
  7.     zoom_scale_ = 1.0f;
  8.     move_start_ = false;
  9.     is_moving_ = false;
  10. }
  11.  
  12. void QImgViewWidget::SetImage(const QString &img_path)
  13. {
  14.     ResetTransform();
  15.     QSize view_size = size();
  16.     //通过QImage加载图像
  17.     img_path_ = img_path;
  18.     img_display_.load(img_path_);
  19.     pix_ori_ = QPixmap::fromImage(img_display_);
  20.     pix_display_ = pix_ori_.scaled(zoom_scale_ *size(),Qt::KeepAspectRatio);
  21.  
  22. }
  23.  
  24. void QImgViewWidget::ResetTransform()
  25. {
  26.     //重新设置缩放比例和移动位置
  27.     zoom_scale_ = 1.0f;
  28.     move_step_ = QPoint(0,0);
  29. }
  30.  
  31. void QImgViewWidget::paintEvent(QPaintEvent *event)
  32. {
  33.     QPainter painter(this);
  34.     painter.drawPixmap(move_step_.x()+(width()-pix_display_.width())/2,move_step_.y()+(height()- pix_display_.height()) / 2,pix_display_);
  35. }
  36.  
  37. void QImgViewWidget::wheelEvent(QWheelEvent *event)
  38. {
  39.     //随滚轮缩放
  40.     if(event->delta()>0)
  41.     {
  42.         zoom_scale_ *= 1.1;
  43.     }
  44.     else {
  45.         zoom_scale_ *=0.9;
  46.     }
  47.     pix_display_ = pix_ori_.scaled(zoom_scale_ * size(),Qt::KeepAspectRatio);
  48.     update();
  49. }
  50.  
  51. void QImgViewWidget::mousePressEvent(QMouseEvent *event)
  52. {
  53.     if(event->button() == Qt::LeftButton)
  54.     {
  55.         if(!move_start_)
  56.         {
  57.             move_start_ = true;
  58.             is_moving_ = false;
  59.             mouse_point_ = event->globalPos();
  60.         }
  61.     }
  62. }
  63.  
  64. void QImgViewWidget::mouseReleaseEvent(QMouseEvent *event)
  65. {
  66.     if(event->button() ==Qt::LeftButton)
  67.     {
  68.         if(move_start_)
  69.         {
  70.             move_start_ = false;
  71.             is_moving_ = false;
  72.         }
  73.     }
  74. }
  75.  
  76. void QImgViewWidget::mouseMoveEvent(QMouseEvent *event)
  77. {
  78.     if(move_start_)
  79.     {
  80.         const QPoint mos_pt = event->globalPos();
  81.         move_step_ +=mos_pt - mouse_point_;
  82.         is_moving_ = true;
  83.         mouse_point_ = mos_pt;
  84.         repaint();
  85.     }
  86. }
  87.  
  88. void QImgViewWidget::resizeEvent(QResizeEvent *event)
  89. {
  90.     pix_display_ = pix_ori_.scaled(zoom_scale_ *size(),Qt::KeepAspectRatio);
  91.     update();
  92. }

mainwindow.h

  1. #ifndef MAINWINDOW_H
  2. #define MAINWINDOW_H
  3.  
  4. #include <QMainWindow>
  5. #include"image_group.h"
  6. #include<QThread>
  7. namespace Ui {
  8. class MainWindow;
  9. }
  10.  
  11. class MainWindow : public QMainWindow
  12. {
  13.     Q_OBJECT
  14.  
  15. public:
  16.     MainWindow(QWidget *parent = Q_NULLPTR);
  17. //    ~MainWindow();
  18.     image_group* get_image_group(){
  19.         return &image_group_;
  20.     }
  21.     Ui::MainWindow* get_ui(){
  22.         return ui;
  23.     }
  24.  
  25.     void InitTreeView();
  26.     void InitPrewView();
  27.     void InitDockView();
  28.     void InitTabView();
  29.     void InitLayout();
  30.     void updateTreeView();
  31.     void updatePreView();
  32.  
  33. private slots:
  34.     void OnActionAddImages();
  35.     void OnActiondoubleClickedTreeImage(const QModelIndex& index);
  36.  
  37. protected:
  38.     void paintEvent(QPaintEvent* event)override;
  39.     void resizeEvent(QResizeEvent* event)override;
  40.  
  41. private:
  42.     Ui::MainWindow *ui;
  43.     image_group image_group_;
  44.  
  45. };
  46.  
  47.  
  48. class QUpdatePreviewThread :public QThread
  49. {
  50.     Q_OBJECT
  51.  
  52. public:
  53.     QUpdatePreviewThread(MainWindow* mainwindow);
  54. signals:
  55.     void SingalAddPreview(const QPixmap& pixmap,const int& img_id);
  56.  
  57. private slots:
  58.     void SlotAddPreview(const QPixmap& pixmap,const int& img_id);
  59.  
  60. protected:
  61.     void run() override;
  62. private:
  63.     MainWindow* mainwindow_;
  64.  
  65. };
  66.  
  67. #endif // MAINWINDOW_H

mainwindow.cpp

  1. #include"utils.h"
  2. #include "mainwindow.h"
  3. #include "ui_mainwindow.h"
  4. #include<QStandardItemModel>
  5. #include<QFileDialog>
  6. #include<QMessageBox>
  7. #include<QResizeEvent>
  8. #include<QListWidgetItem>
  9. #include<QImageReader>
  10.  
  11. MainWindow::MainWindow(QWidget *parent) :
  12.     QMainWindow(parent),
  13.     ui(new Ui::MainWindow)
  14. {
  15.     ui->setupUi(this);
  16.     setWindowState(Qt::WindowMaximized);
  17.  
  18.     //初始化Ui
  19.     InitDockView();
  20.     InitTreeView();
  21.     InitTabView();
  22.     InitPrewView();
  23.  
  24.     InitLayout();
  25.  
  26.     connect(ui->action_addimages,&QAction::triggered,this,&MainWindow::OnActionAddImages);
  27.     connect(ui->tree_images,&QTreeView::doubleClicked,this,&MainWindow::OnActiondoubleClickedTreeImage);
  28.     connect(ui->list_previews,&QTreeView::doubleClicked,this,&MainWindow::OnActiondoubleClickedTreeImage);
  29. }
  30.  
  31.  
  32.  
  33. void MainWindow::InitTreeView()
  34. {
  35.     //初始化tree view
  36.     auto tree_imgs = ui->tree_images;
  37.     auto* model = new QStandardItemModel(tree_imgs);
  38.     tree_imgs->setModel(model);
  39.     model->setHorizontalHeaderLabels(QStringList()<<QStringLiteral("images"));
  40.     tree_imgs->setEditTriggers(QAbstractItemView::NoEditTriggers);
  41. }
  42.  
  43. void MainWindow::InitPrewView()
  44. {
  45.     //初始化preview view
  46.     auto list_preview = ui->list_previews;
  47.     list_preview->setIconSize(QSize(100,100));
  48.     list_preview->setResizeMode(QListView::Adjust);
  49.     list_preview->setViewMode(QListView::IconMode);
  50.     list_preview->setMovement(QListView::Static);
  51.     list_preview->setSpacing(10);
  52.  
  53. }
  54.  
  55. void MainWindow::InitDockView()
  56. {
  57.     //初始化dockView
  58.     auto dp_workspace = (QDockWidget*)ui->dock_workspace;
  59.     dp_workspace->setWindowTitle("Wokspace");
  60.     addDockWidget(Qt::LeftDockWidgetArea,dp_workspace);
  61. }
  62.  
  63. void MainWindow::InitTabView()
  64. {
  65.     //2d/3d部件的样式表
  66. //    auto tab_view = ui->tab_mainview;
  67. //    tab_view->setStyleSheet("QTabWidget:pane{ border: 1px ;}//                                QTabBar::tab{width:50px;height:28px; background-color:rgb(36,36,36); color:rgb(200,200,200); margin-right: 2px; margin-bottom:-2px;}//                                QTabBar::tab:selected{border:1px;border-bottom-color: none; background-color:rgb(50,50,50)}//                                QTabBar::tab:!selected{border-bottom: 3px;}//                            ");
  68. //    tab_view->setCurrentIndex(0);
  69.  
  70. //    auto wid_model = ui->widget_model;
  71. //    wid_model->setStyleSheet("background-color:rgb(80,80,80);");
  72.  
  73. //    auto wid_image = ui->widght_imgview;
  74. //    wid_image->setStyleSheet(" background-color:rgb(80,80,80);");
  75.  
  76. //    //照片/控制台部件样式表
  77. //    auto tab_info = ui->tab_info;
  78. //    tab_info->setStyleSheet("QTabWidget:pane{ border: 1px ;}//                                QTabBar::tab{width:60px;height:28px; background-color:rgb(36,36,36); color:rgb(200,200,200); margin-right: 2px; margin-bottom:-2px;}//                                QTabBar::tab:selected{border:1px;border-bottom-color: none; background-color:rgb(50,50,50)}//                                QTabBar::tab:!selected{border-bottom: 3px;}//                            ");
  79. //    auto wid_priviews = ui->widget_previews;
  80. //    wid_priviews->setStyleSheet(" background-color:rgb(80,80,80);");
  81.  
  82. //    auto wid_console = ui->widget_console;
  83. //    wid_console->setStyleSheet(" background-color:rgb(80,80,80);");
  84. }
  85.  
  86. void MainWindow::InitLayout()
  87. {
  88.  
  89. }
  90.  
  91. void MainWindow::updateTreeView()
  92. {
  93.     //相关操作后更新tree view。例如，加载图像
  94.     const auto all_images = image_group_.GetAllImages();
  95.     const auto new_images = image_group_.GetNewAddingImages();
  96.  
  97.     if(new_images.empty())
  98.         return;
  99.     const auto num_allimages = all_images.size();
  100.     const auto num_images = new_images.size();
  101.  
  102.     auto* tree = ui->tree_images;
  103.     auto* model = static_cast<QStandardItemModel*>(tree->model());
  104.     QString str_title = QString("All Images (%1 Images)").arg(num_allimages);
  105.  
  106.     if(model->item(0,0) ==nullptr)
  107.     {
  108.         model->setItem(0,0,new QStandardItem(str_title));
  109.     }
  110.     else {
  111.         auto item = model->item(0,0);
  112.         item->setText(str_title);
  113.     }
  114.  
  115.     //为tree添加图片的名字
  116.     for(auto image:new_images)
  117.     {
  118.         model->item(0,0)->setChild(image.get_id(),0,new QStandardItem(str2qstr(image.get_name())));
  119.     }
  120.  
  121.     tree->setExpanded(model->index(0,0),true);
  122.  
  123.     auto workspace = static_cast<QDockWidget*>(ui->dock_workspace);
  124.     auto ws_size = workspace->frameSize();
  125.     tree->setFixedWidth(ws_size.width());
  126.  
  127. }
  128.  
  129. void MainWindow::updatePreView()
  130. {
  131.     auto tab_info = ui->tab_info;
  132.     tab_info->setCurrentIndex(0);
  133.  
  134.     //通过线程来创建previews
  135.     QUpdatePreviewThread* thread = new QUpdatePreviewThread(this);
  136.     thread->start();
  137.  
  138. }
  139.  
  140. void MainWindow::OnActionAddImages()
  141. {
  142.     QStringList file_paths = QFileDialog::getOpenFileNames(this,tr("Image Path"),"Data\\", tr("Image Files(*png *jpg *tif);"));
  143.  
  144.     //添加图片
  145.     vector<string> str_paths;
  146.     for(auto path:file_paths)
  147.     {
  148.         str_paths.push_back(qstr2str(path));
  149.     }
  150.     image_group_.addImages(str_paths);
  151.  
  152.     //更新tree view
  153.     updateTreeView();
  154.     //更新preview view
  155.     updatePreView();
  156.  
  157. }
  158.  
  159. void MainWindow::OnActiondoubleClickedTreeImage(const QModelIndex &index)
  160. {
  161.     QMessageBox msg_box;
  162.  
  163.     auto* tree = ui->tree_images;
  164.     auto* model = static_cast<QStandardItemModel*>(tree->model());
  165.     unsigned img_id = index.row();
  166.  
  167.     const auto all_images = image_group_.GetAllImages();
  168.     if(img_id>=all_images.size())
  169.     {
  170.         msg_box.setText("data error");
  171.         msg_box.exec();
  172.         return;
  173.     }
  174.  
  175.     //获得双击的图片路径
  176.     auto image = all_images[img_id];
  177.     auto imgpath = str2qstr(image.get_path());
  178.  
  179.     //repaint
  180.     auto img_view = ui->widght_imgview;
  181.     img_view->SetImage(imgpath);
  182.     img_view->repaint();
  183.  
  184. }
  185.  
  186. void MainWindow::paintEvent(QPaintEvent* event)
  187. {
  188. }
  189.  
  190. void MainWindow::resizeEvent(QResizeEvent* event)
  191. {
  192.     //自动调整所有小部件的大小
  193.     const QSize size = event->size();
  194.     const QRect frame_geometry = ui->central_widget->geometry();
  195.     const QSize frame_size = ui->central_widget->size();
  196.     const QSize menu_size = ui->menuBar->size();
  197.     QSize layout_h1(menu_size.width() * 0.12, frame_size.height()),
  198.                     layout_h2(menu_size.width() * 0.76, frame_size.height()),
  199.                     layout_h3(menu_size.width() * 0.12, frame_size.height());
  200.     QSize layout_v1(menu_size.width(), frame_size.height()*0.8),
  201.                     layout_v2(menu_size.width(), frame_size.height()*0.2);
  202.  
  203.     // workspace
  204.     ui->dock_workspace->setMinimumWidth(layout_h1.width());
  205.     ui->dock_workspace->setMaximumHeight(frame_size.height());
  206.  
  207.     // main view(model and image)
  208.     ui->tab_mainview->setFixedSize(layout_h2.width() - 10, layout_v1.height());
  209.     QSize tab_bar_sz = ui->tab_mainview->tabBar()->size();
  210.     ui->widget_model->setFixedSize(layout_h2.width() - 10, layout_v1.height() - tab_bar_sz.height());
  211.     ui->widght_imgview->setFixedSize(layout_h2.width() - 10, layout_v1.height() - tab_bar_sz.height());
  212.     ui->widget_gl_model->setFixedSize(layout_h2.width() - 10, layout_v1.height() - tab_bar_sz.height());
  213.  
  214.     // info view(photos and console)
  215.     QRect view_rt = ui->tab_mainview->frameGeometry();
  216.     ui->tab_info->setGeometry(view_rt.x(), view_rt.y() + view_rt.height()+5, layout_h2.width() - 10, layout_v2.height());
  217.     auto tab_sz = ui->tab_info->size();
  218.     tab_bar_sz = ui->tab_info->tabBar()->size();
  219.     ui->list_previews->setGeometry(0, 0, tab_sz.width(), tab_sz.height()- tab_bar_sz.height());
  220.  
  221.     setMinimumSize(500, 500);
  222.  
  223. }
  224.  
  225.  
  226.  
  227. QUpdatePreviewThread::QUpdatePreviewThread(MainWindow *mainwindow)
  228. {
  229.     mainwindow_ = mainwindow;
  230.     connect(this, SIGNAL(SingalAddPreview(const QPixmap&, const int&)), this, SLOT(SlotAddPreview(const QPixmap&, const int&)));
  231. }
  232.  
  233. void QUpdatePreviewThread::SlotAddPreview(const QPixmap &pixmap, const int &img_id)
  234. {
  235.     auto ui = mainwindow_->get_ui();
  236.     const auto all_images = mainwindow_->get_image_group()->GetAllImages();
  237.     if(img_id >=all_images.size())
  238.         return;
  239.  
  240.     auto list_preview = ui->list_previews;
  241.     const QSize icon_sz = list_preview->iconSize();
  242.  
  243.     auto image = all_images[img_id];
  244.     QListWidgetItem* list_item = new QListWidgetItem(QIcon(pixmap),str2qstr(image.get_name()));
  245.     list_item->setSizeHint(QSize(icon_sz.width(),icon_sz.height()+10));
  246.     list_preview->insertItem(img_id,list_item);
  247.     list_preview->repaint();
  248.  
  249. }
  250.  
  251. void QUpdatePreviewThread::run()
  252. {
  253.     if(mainwindow_ ==nullptr || mainwindow_->get_image_group() ==nullptr)
  254.     {
  255.         return;
  256.     }
  257.     auto ui = mainwindow_->get_ui();
  258.  
  259.     const auto new_images = mainwindow_->get_image_group()->GetNewAddingImages();
  260.     if(new_images.empty())
  261.     {
  262.         return;
  263.     }
  264.     const auto num_images = new_images.size();
  265.  
  266.     QImageReader reader;
  267.     for(auto k=0;k<num_images;k++)
  268.     {
  269.         auto image = new_images[k];
  270.  
  271.         reader.setFileName(str2qstr(image.get_path()));
  272.         reader.setAutoTransform(true);
  273.         const QSize img_size = reader.size();
  274.         const QSize icon_sz = ui->list_previews->iconSize();
  275.         const QSize size_scale = img_size.scaled(icon_sz,Qt::KeepAspectRatio);
  276.         reader.setScaledSize(size_scale);
  277.  
  278.         auto pixmap = QPixmap::fromImageReader(&reader);
  279.  
  280.         emit SingalAddPreview(pixmap,image.get_id());
  281.     }
  282.  
  283. }

main.cpp

  1. #include "mainwindow.h"
  2. #include <QApplication>
  3.  
  4. int main(int argc, char *argv[])
  5. {
  6.     QApplication a(argc, argv);
  7.     MainWindow w;
  8.     w.show();
  9.  
  10.     return a.exec();
  11. }

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