实现缩略图的简单功能

app/Scanner/Scanner/mainwindow.cpp

@@ -6,6 +6,7 @@ MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent)
     , ui(new Ui::MainWindow)
     , m_view(new HGImgView(this))
+    , m_thumb(new HGImgThumb(this))
 {
     ui->setupUi(this);
     // 隐藏centralwidget
@@ -33,13 +34,26 @@ MainWindow::MainWindow(QWidget *parent)
     ui->toolBar->addSeparator();
     ui->toolBar->addAction(ui->act_help);
 
-    m_view->resize(600, 500);
-    m_view->move(100, 100);
+    //m_view->move(0, 100);
+    //m_view->resize(400, height() - 150);
+    m_thumb->move(00, 100);
+    m_thumb->resize(800, height() - 150);
 
     HGImage img = NULL;
     HGImgFmt_LoadImage("D:\\1.jpg", 0, NULL, HGBASE_IMGTYPE_RGB, HGBASE_IMGORIGIN_TOP, &img);
     m_view->addImage(img);
     HGBase_DestroyImage(img);
+
+    QImage img2("D:\\image.png");
+    m_thumb->setDefItemImage(&img2);
+    m_thumb->setType(ThumbType_Grid);
+
+    for (int i = 0; i < 1000; ++i)
+    {
+        char fileName[256];
+        sprintf(fileName, "D:\\Pictures\\%d.jpg", i);
+        m_thumb->addItem(fileName);
+    }
 }
 
 MainWindow::~MainWindow()

app/Scanner/Scanner/mainwindow.h

@@ -45,5 +45,6 @@ private slots:
 private:
     Ui::MainWindow *ui;
     HGImgView *m_view;
+    HGImgThumb *m_thumb;
 };
 #endif // MAINWINDOW_H

ui/HGImgThumb.hpp

@@ -7,7 +7,14 @@
 #include "../base/HGEvent.h"
 #include "../base/HGThread.h"
 #include "../base/HGImage.h"
-#include <QListWidget>
+#include <QWidget>
+
+enum ThumbType
+{
+    ThumbType_Hori = 0,     // 水平, item垂直居中
+    ThumbType_Vert = 1,     // 垂直, item水平居中
+    ThumbType_Grid = 2      // 网格, 可以放大缩小
+};
 
 enum ThumbRemoveFlag
 {
@@ -18,18 +25,36 @@ enum ThumbRemoveFlag
 
 struct HGImgThumbItem
 {
+    HGImgThumbItem()
+    {
+        image = NULL;
+        selected = false;
+    }
+
+    ~HGImgThumbItem()
+    {
+        delete image;
+        image = NULL;
+    }
+
     QString fileName;
-    QListWidgetItem *item;
+    QImage *image;
+    bool selected;
 };
 
-class HGImgThumb : public QListWidget
+class HGImgThumb : public QWidget
 {
     Q_OBJECT
 public:
     HGImgThumb(QWidget* parent = nullptr);
     virtual ~HGImgThumb();
 
-    HGResult setDefItemImage(HGImage image);
+    HGResult setType(ThumbType type);
+    HGResult setGap(int width);
+    HGResult zoomIn(const HGPoint *pCenter);
+    HGResult zoomOut(const HGPoint *pCenter);
+    HGResult setDefItemImage(const QImage *image);
+
     HGResult getItemCount(int *count);
     HGResult addItem(const QString &fileName);
     HGResult insertItem(const QString &fileName, int pos);
@@ -44,21 +69,68 @@ public:
     HGResult refreshItem(int index);
     HGResult refreshAllItems();
 
+signals:
+    void currentItemChanged(int index);
+    void itemClicked(int index);
+    void itemDoubleClicked(int index);
+    void itemCountChanged(int count);
+    void itemSelectingChanged();
+    void contextMenuEvent(int index);
+
+protected:
+    virtual void mousePressEvent(QMouseEvent *e);
+    virtual void mouseMoveEvent(QMouseEvent* e);
+    virtual void mouseReleaseEvent(QMouseEvent *e);
+    virtual void enterEvent(QEvent *e);
+    virtual void leaveEvent(QEvent *e);
+    virtual void paintEvent(QPaintEvent* e);
+    virtual void wheelEvent(QWheelEvent* e);
+    virtual void resizeEvent(QResizeEvent* e);
+    virtual void keyPressEvent(QKeyEvent *e);
+    virtual void keyReleaseEvent(QKeyEvent *e);
+    virtual void focusInEvent(QFocusEvent *e);
+    virtual void focusOutEvent(QFocusEvent *e);
+    virtual void contextMenuEvent(QContextMenuEvent* e);
+
+signals:
+    void updateItem();
+private slots:
+    void on_updateItem();
+
 private:
-    static QIcon createIcon(HGImage image);
+    static QImage* createItemImage(const QImage *srcImage, int itemSize);
+    static QImage* createItemImage(HGImage srcImage, int itemSize);
+    void updateShowRect();
+    bool wnd2ShowRect(QPoint &pt);
+    bool showRect2Wnd(QPoint &pt);
+    bool getItemLoc(int index, QPoint &pt, int &row, int &col);
+    int getItem(const QPoint &pt);
+    int getInsertPos(const QPoint &pt);
     int findIndex(const QString &fileName);
-    int findIndex(const QListWidgetItem *item);
+    void Show();
     static void ThreadFunc(HGThread thread, HGPointer param);
 
 private:
     HGLock m_lockFront;
     HGLock m_lockBack;
+    HGLock m_lockItemSize;
     HGEvent m_event;
+    ThumbType m_type;
+    QImage *m_defItemImage;
+    QImage *m_itemImage;
+    int m_gapWidth;
+    int m_itemSize;
+    int m_curItemIndex;
+    int m_hotItemIndex;
+    int m_signItemIndex;
     bool m_stopThread;
     HGThread m_thread;
-    QIcon m_defItemIcon;
     std::vector<HGImgThumbItem> m_frontItems;
     std::list<QString> m_backList;
+    bool m_showThumb;
+    HGRect m_showRect;
+    int m_mousePosX;
+    int m_mousePosY;
 };
 
 #endif /* __HGIMGTHUMB_HPP__ */

ui/HGImgView.cpp

@@ -374,6 +374,25 @@ HGResult HGImgView::showColorInfo(bool show)
     return HGBASE_ERR_OK;
 }
 
+void HGImgView::mousePressEvent(QMouseEvent* e)
+{
+    assert(0 == m_operate);
+    if (NULL == m_image || !m_showImage)
+    {
+        return;
+    }
+
+    HGRect rcWnd = {0, 0, this->width(), this->height()};
+    if ((m_showRect.left - (float)rcWnd.left < -1e-3) || (m_showRect.right - (float)rcWnd.right > 1e-3)
+        || (m_showRect.top - (float)rcWnd.top < -1e-3) || (m_showRect.bottom - (float)rcWnd.bottom > 1e-3))
+    {
+        m_operate = 1;
+        m_beginX = e->pos().x();
+        m_beginY = e->pos().y();
+        updateCursor();
+    }
+}
+
 void HGImgView::mouseMoveEvent(QMouseEvent* e)
 {
     if (1 == m_operate)
@@ -458,25 +477,6 @@ void HGImgView::mouseMoveEvent(QMouseEvent* e)
     updateCursor();
 }
 
-void HGImgView::mousePressEvent(QMouseEvent* e)
-{
-    assert(0 == m_operate);
-    if (NULL == m_image || !m_showImage)
-    {
-        return;
-    }
-
-    HGRect rcWnd = {0, 0, this->width(), this->height()};
-    if ((m_showRect.left - (float)rcWnd.left < -1e-3) || (m_showRect.right - (float)rcWnd.right > 1e-3)
-        || (m_showRect.top - (float)rcWnd.top < -1e-3) || (m_showRect.bottom - (float)rcWnd.bottom > 1e-3))
-    {
-        m_operate = 1;
-        m_beginX = e->pos().x();
-        m_beginY = e->pos().y();
-        updateCursor();
-    }
-}
-
 void HGImgView::mouseReleaseEvent(QMouseEvent* e)
 {
     Q_UNUSED(e);
@@ -487,6 +487,17 @@ void HGImgView::mouseReleaseEvent(QMouseEvent* e)
     updateCursor();
 }
 
+void HGImgView::enterEvent(QEvent *e)
+{
+
+}
+
+void HGImgView::leaveEvent(QEvent *e)
+{
+    m_mousePosX = -1;
+    m_mousePosY = -1;
+}
+
 void HGImgView::paintEvent(QPaintEvent* e)
 {
     Q_UNUSED(e);

ui/HGImgView.hpp

@@ -35,9 +35,11 @@ signals:
     void scaleChanged(double scale);
 
 protected:
-    virtual void mouseMoveEvent(QMouseEvent* e);
     virtual void mousePressEvent(QMouseEvent *e);
+    virtual void mouseMoveEvent(QMouseEvent* e);
     virtual void mouseReleaseEvent(QMouseEvent *e);
+    virtual void enterEvent(QEvent *e);
+    virtual void leaveEvent(QEvent *e);
     virtual void paintEvent(QPaintEvent* e);
     virtual void wheelEvent(QWheelEvent* e);
     virtual void resizeEvent(QResizeEvent* e);