QTreeWidget、QDockWidget使用

实验

1. QTreeWidget遍历树节点
2. QTreeWidget增加、删除树节点
3. QDockWidget的显示，停靠
4. 图片的加载显示，放大、缩小、横向自适应，竖向自适应

 .h文件

#ifndef TREEWIDGETEXAMPLE_H
#define TREEWIDGETEXAMPLE_H

#include <QMainWindow>
#include <QTreeWidgetItem>
#include <QLabel>
#include <QSpinBox>
#include <QPixMap>


namespace Ui {
class TreeWidgetExample;
}

class TreeWidgetExample : public QMainWindow
{
    Q_OBJECT
private:
    //
    enum treeItemType
    {
        itTopItem=1001,//顶层节点
        itGroupItem,//组节点  有叶子
        itImageItem};//图片  叶子

    enum treeColNum
    {
        colItem=0,
        colItemType=1,
        colDate
    };
    QLabel *labFileName;//
    QLabel *labNodeText;
    QSpinBox *spinRatio;
    QLabel *labInfo;

    QPixmap m_pixmap;//当前图片
    float m_ratio;//当前图片缩放比例

    void buildTreeHeader();//构建表头
    void iniTree();//目录树初始化
    //添加目录节点
    void addFolderItem(QTreeWidgetItem *parItem,QString dirName);
    //从目录全名获取最后的文件夹名
    QString getFinalFolderName(const QString &fullPathName);

    void addImageItem(QTreeWidgetItem *parItem,QString aFileName);

    void displayImage(QTreeWidgetItem *item);

    void changeItemCaption(QTreeWidgetItem *item);
    //删除节点
    void deleteItem(QTreeWidgetItem *parItem,QTreeWidgetItem *item);


public:
    explicit TreeWidgetExample(QWidget *parent = nullptr);
    ~TreeWidgetExample();

private slots:
    void on_treeFiles_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous);

    void on_actAddFolder_triggered();

    void on_actAddFiles_triggered();

    void on_actDeleteItem_triggered();

    void on_actScanItems_triggered();

    void on_actZoomIn_triggered();

    void on_actZoomOut_triggered();

    void on_actZoomRealSize_triggered();

    void on_actZoomFitW_triggered();

    void on_actZoomFitH_triggered();

    void on_actDockFloat_triggered(bool checked);

    void on_actDockVisible_triggered(bool checked);

    void on_dockWidget_visibilityChanged(bool visible);

    void on_dockWidget_topLevelChanged(bool topLevel);

    void on_treeFiles_itemChanged(QTreeWidgetItem *item, int column);

    void on_treeFiles_itemCollapsed(QTreeWidgetItem *item);

    void on_treeFiles_itemExpanded(QTreeWidgetItem *item);

    void on_treeFiles_itemSelectionChanged();

    void on_treeFiles_itemClicked(QTreeWidgetItem *item, int column);

    void on_treeFiles_itemPressed(QTreeWidgetItem *item, int column);

private:
    Ui::TreeWidgetExample *ui;
};

#endif // TREEWIDGETEXAMPLE_H

.cpp文件

#include "treewid