引入ListIcon代理

main.cpp

@@ -5,8 +5,8 @@
 int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
-    //    MainWindow w;
+    MainWindow w;
-    //    w.show();
+    w.show();
 
     //    DBUnit t;
 

mainwindow.cpp

@@ -5,11 +5,14 @@
 #include <QSplitter>
 #include <QVBoxLayout>
 
-#define GROUP_ITEMSCOUNT Qt::UserRole + 1
-#define GROUP_TITLE Qt::DisplayRole
 #define GROUP_COVER0 Qt::DecorationRole
 #define GROUP_COVER1 Qt::UserRole + 3
 #define GROUP_COVER2 Qt::UserRole + 4
+#define GROUP_TITLE Qt::DisplayRole
+#define GROUP_ITEMSCOUNT Qt::UserRole + 1
+
+#define ITEM_ICON Qt::DecorationRole
+#define ITEM_TITLE Qt::DisplayRole
 
 MainWindow::MainWindow(QWidget* parent)
     : QMainWindow(parent), groups_view(new QListView(this)),
@@ -31,6 +34,9 @@ MainWindow::MainWindow(QWidget* parent)
     groups_view->setItemDelegate(new GroupDisplayDelegate);
     groups_view->setMovement(QListView::Free);
     init_groups_list(groups_list);
+
+    init_groups_list(items_list);
+    items_view->setItemDelegate(new ListIconDelegate());
 }
 
 MainWindow::~MainWindow()
@@ -104,14 +110,20 @@ GroupDisplayDelegate::paint(QPainter* painter, const QStyleOptionViewItem& optio
     auto cover0 = index.data(GROUP_COVER0);
     if (cover0.isNull())
         cover0 = default_cover->pixmap(QSize(100, 150));
+    else
+        cover0 = cover0.value<QIcon>().pixmap(QSize(100, 150));
 
     auto cover1 = index.data(GROUP_COVER1);
     if (cover1.isNull())
         cover1 = default_cover->pixmap(QSize(100, 150));
+    else
+        cover0 = cover0.value<QIcon>().pixmap(QSize(100, 150));
 
     auto cover2 = index.data(GROUP_COVER2);
     if (cover2.isNull())
         cover2 = default_cover->pixmap(QSize(100, 150));
+    else
+        cover0 = cover0.value<QIcon>().pixmap(QSize(100, 150));
 
     auto valid_rect = option.rect - QMargins(15, 15, 15, 15);
 
@@ -142,3 +154,58 @@ GroupDisplayDelegate::sizeHint(const QStyleOptionViewItem& option, const QModelI
 {
     return QSize(400, 145);
 }
+
+ListIconDelegate::ListIconDelegate()
+    : default_cover(new QIcon(":/imgs/default/cover.jpg"))
+{
+}
+
+ListIconDelegate::~ListIconDelegate()
+{
+    delete default_cover;
+}
+
+void
+ListIconDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
+{
+    drawBackground(painter, option, index);
+
+    auto valid_rect = option.rect - QMargins(15, 15, 15, 15);
+    auto cover = index.data(ITEM_ICON);
+    if (!cover.isValid())
+        cover = default_cover->pixmap(100, 150);
+    else
+        cover = cover.value<QIcon>().pixmap(QSize(100, 150));
+
+    painter->drawPixmap(valid_rect, cover.value<QPixmap>());
+}
+
+QSize
+ListIconDelegate::sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const
+{
+    return QSize(100, 160);
+}
+
+QWidget*
+ListIconDelegate::createEditor(QWidget* parent, const QStyleOptionViewItem& option, const QModelIndex& index) const
+{
+    return new QLineEdit(parent);
+}
+
+void
+ListIconDelegate::setEditorData(QWidget* editor, const QModelIndex& index) const
+{
+    static_cast<QLineEdit*>(editor)->setText(index.data().toString());
+}
+
+void
+ListIconDelegate::setModelData(QWidget* editor, QAbstractItemModel* model, const QModelIndex& index) const
+{
+    model->setData(index, static_cast<QLineEdit*>(editor)->text());
+}
+
+void
+ListIconDelegate::updateEditorGeometry(QWidget* editor, const QStyleOptionViewItem& option, const QModelIndex& index) const
+{
+    editor->setGeometry(option.rect);
+}

mainwindow.h

@@ -25,6 +25,24 @@ private:
     QIcon* const default_cover;
 };
 
+class ListIconDelegate : public QItemDelegate {
+public:
+    ListIconDelegate();
+    virtual ~ListIconDelegate() override;
+
+    // QAbstractItemDelegate interface
+public:
+    virtual void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const override;
+    virtual QSize sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const override;
+    virtual QWidget* createEditor(QWidget* parent, const QStyleOptionViewItem& option, const QModelIndex& index) const override;
+    virtual void setEditorData(QWidget* editor, const QModelIndex& index) const override;
+    virtual void setModelData(QWidget* editor, QAbstractItemModel* model, const QModelIndex& index) const override;
+    virtual void updateEditorGeometry(QWidget* editor, const QStyleOptionViewItem& option, const QModelIndex& index) const override;
+
+private:
+    QIcon* const default_cover;
+};
+
 class MainWindow : public QMainWindow {
     Q_OBJECT