1. 统一文件图标管理

2. 使用自带机制回执选中机制图示，绘制图标

Bookshelf.pro

@@ -16,12 +16,19 @@ DEFINES += QT_DEPRECATED_WARNINGS
 # You can also select to disable deprecated APIs only up to a certain version of Qt.
 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
 
+msvc {
+    QMAKE_CFLAGS += /utf-8
+    QMAKE_CXXFLAGS += /utf-8
+}
+
 SOURCES += \
+    corehost.cpp \
     dbunit.cpp \
     main.cpp \
     mainwindow.cpp
 
 HEADERS += \
+    corehost.h \
     dbunit.h \
     mainwindow.h
 

corehost.cpp

@@ -0,0 +1,24 @@
+#include "corehost.h"
+#include <QDebug>
+#include <QHash>
+#include <QIcon>
+
+CoreHost::CoreHost()
+{
+}
+
+CoreHost::~CoreHost()
+{
+    for (auto item : pics_resources)
+        delete item;
+    pics_resources.clear();
+}
+
+QIcon*
+CoreHost::queryCoverIcon(const QString& path)
+{
+    if (!pics_resources.contains(path))
+        pics_resources.insert(path, new QIcon(path));
+
+    return pics_resources.value(path);
+}

corehost.h

@@ -0,0 +1,19 @@
+#ifndef COREHOST_H
+#define COREHOST_H
+
+#include <QHash>
+#include <QObject>
+
+class CoreHost
+{
+public:
+    CoreHost();
+    virtual ~CoreHost();
+
+    QIcon* queryCoverIcon(const QString& path);
+
+private:
+    QHash<QString, QIcon*> pics_resources;
+};
+
+#endif // COREHOST_H

mainwindow.cpp

@@ -1,24 +1,30 @@
 #include "mainwindow.h"
+#include "corehost.h"
+#include <QDebug>
 #include <QLineEdit>
 #include <QPainter>
 #include <QRandomGenerator>
 #include <QSplitter>
 #include <QVBoxLayout>
 
-#define GROUP_COVER0 Qt::DecorationRole
+#define GROUP_COVER0_PATH Qt::UserRole + 1
-#define GROUP_COVER1 Qt::UserRole + 3
+#define GROUP_COVER1_PATH Qt::UserRole + 2
-#define GROUP_COVER2 Qt::UserRole + 4
+#define GROUP_COVER2_PATH Qt::UserRole + 3
 #define GROUP_TITLE Qt::DisplayRole
-#define GROUP_ITEMSCOUNT Qt::UserRole + 1
+#define GROUP_ITEMSCOUNT Qt::UserRole + 4
 
-#define ITEM_ICON Qt::DecorationRole
+#define ITEM_ICON_PATH Qt::UserRole + 1
 #define ITEM_TITLE Qt::DisplayRole
 
+CoreHost host;
+
 MainWindow::MainWindow(QWidget* parent)
     : QMainWindow(parent), groups_view(new QListView(this)),
       groups_list(new QStandardItemModel(this)), items_view(new QListView(this)),
       items_list(new QStandardItemModel(this))
 {
+    setMinimumSize(800, 600);
+
     groups_view->setModel(groups_list);
     items_view->setModel(items_list);
 
@@ -37,6 +43,11 @@ MainWindow::MainWindow(QWidget* parent)
 
     init_groups_list(items_list);
     items_view->setItemDelegate(new ListIconDelegate());
+    items_view->setViewMode(QListView::IconMode);
+    items_view->setResizeMode(QListView::Adjust);
+    items_view->setSelectionRectVisible(true);
+    items_view->setGridSize(QSize(135, 195));
+    items_view->setIconSize(QSize(120, 180));
 }
 
 MainWindow::~MainWindow()
@@ -53,19 +64,18 @@ MainWindow::init_groups_list(QStandardItemModel* model)
         QList<QStandardItem*> row;
         row << new QStandardItem("无名集合0");
         row.last()->setData(gen.generate() % 100, GROUP_ITEMSCOUNT);
+        row.last()->setData(":/imgs/default/cover_item.jpg", GROUP_COVER0_PATH);
 
         model->appendRow(row);
     }
 }
 
 GroupDisplayDelegate::GroupDisplayDelegate()
-    : default_cover(new QIcon(":/imgs/default/cover.jpg"))
 {
 }
 
 GroupDisplayDelegate::~GroupDisplayDelegate()
 {
-    delete default_cover;
 }
 
 QWidget*
@@ -107,37 +117,38 @@ GroupDisplayDelegate::paint(QPainter* painter, const QStyleOptionViewItem& optio
 {
     drawBackground(painter, option, index);
 
-    auto cover0 = index.data(GROUP_COVER0);
+    QIcon *icon0 = nullptr, *icon1 = nullptr, *icon2 = nullptr;
+    auto cover0 = index.data(GROUP_COVER0_PATH);
     if (cover0.isNull())
-        cover0 = default_cover->pixmap(QSize(100, 150));
+        icon0 = host.queryCoverIcon(":/imgs/default/cover.jpg");
     else
-        cover0 = cover0.value<QIcon>().pixmap(QSize(100, 150));
+        icon0 = host.queryCoverIcon(cover0.toString());
 
-    auto cover1 = index.data(GROUP_COVER1);
+    auto cover1 = index.data(GROUP_COVER1_PATH);
     if (cover1.isNull())
-        cover1 = default_cover->pixmap(QSize(100, 150));
+        icon1 = host.queryCoverIcon(":/imgs/default/cover.jpg");
     else
-        cover0 = cover0.value<QIcon>().pixmap(QSize(100, 150));
+        icon1 = host.queryCoverIcon(cover1.toString());
 
-    auto cover2 = index.data(GROUP_COVER2);
+    auto cover2 = index.data(GROUP_COVER2_PATH);
     if (cover2.isNull())
-        cover2 = default_cover->pixmap(QSize(100, 150));
+        icon2 = host.queryCoverIcon(":/imgs/default/cover.jpg");
     else
-        cover0 = cover0.value<QIcon>().pixmap(QSize(100, 150));
+        icon2 = host.queryCoverIcon(cover2.toString());
 
     auto valid_rect = option.rect - QMargins(15, 15, 15, 15);
 
-    auto pixmap1 = cover1.value<QPixmap>();
+    auto pixmap1 = icon1->pixmap(100, 150);
-    QRectF rect1(valid_rect.left() + 60, valid_rect.top() + 20, 54, 80);
+    QRect rect1(valid_rect.left() + 60, valid_rect.top() + 20, 54, 80);
-    painter->drawPixmap(rect1, pixmap1, QRectF(0, 0, 100, 150));
+    painter->drawPixmap(rect1, pixmap1);
 
-    auto pixmap2 = cover2.value<QPixmap>();
+    auto pixmap2 = icon2->pixmap(100, 150);
-    QRectF rect2(valid_rect.left() + 34, valid_rect.top() + 10, 66, 100);
+    QRect rect2(valid_rect.left() + 34, valid_rect.top() + 10, 66, 100);
-    painter->drawPixmap(rect2, pixmap2, QRectF(0, 0, 100, 150));
+    painter->drawPixmap(rect2, pixmap2);
 
-    auto pixmap0 = cover0.value<QPixmap>();
+    auto pixmap0 = icon0->pixmap(100, 150);
-    QRectF rect0(valid_rect.left(), valid_rect.top(), 80, 120);
+    QRect rect0(valid_rect.left(), valid_rect.top(), 80, 120);
-    painter->drawPixmap(rect0, pixmap0, QRectF(0, 0, 100, 150));
+    painter->drawPixmap(rect0, pixmap0);
 
     QStyleOptionViewItem new_copy = option;
     new_copy.font.setPointSize(26);
@@ -156,34 +167,44 @@ GroupDisplayDelegate::sizeHint(const QStyleOptionViewItem& option, const QModelI
 }
 
 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);
+    painter->save();
+
+    QPen pen(QColor(0, 0, 200, 150), 3, Qt::SolidLine);
+    painter->setPen(pen);
+    QBrush brush(QColor(20, 20, 150, 100));
+    painter->setBrush(brush);
+
+    painter->setRenderHint(QPainter::Antialiasing);
+    if (option.state & QStyle::State_Selected)
+        painter->drawRoundedRect(option.rect - QMargins(2, 2, 2, 2), 5, 5);
+
+    QIcon* icon = nullptr;
+    auto cover = index.data(ITEM_ICON_PATH);
+    if (!cover.isValid())
+        icon = host.queryCoverIcon(":/imgs/default/cover.jpg");
+    else
+        icon = host.queryCoverIcon(cover.toString());
 
     auto valid_rect = option.rect - QMargins(15, 15, 15, 15);
-    auto cover = index.data(ITEM_ICON);
+    drawDecoration(painter, option, valid_rect, icon->pixmap(120, 180));
-    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>());
+    painter->restore();
 }
 
 QSize
 ListIconDelegate::sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const
 {
-    return QSize(100, 160);
+    return QSize(135, 195);
 }
 
 QWidget*

mainwindow.h

@@ -20,9 +20,6 @@ public:
     virtual void updateEditorGeometry(QWidget* editor, const QStyleOptionViewItem& option, const QModelIndex& index) const override;
     virtual void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const override;
     virtual QSize sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const override;
-
-private:
-    QIcon* const default_cover;
 };
 
 class ListIconDelegate : public QItemDelegate {
@@ -38,9 +35,6 @@ public:
     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 {

resource.qrc

@@ -1,5 +1,6 @@
 <RCC>
     <qresource prefix="/imgs/default">
         <file>cover.jpg</file>
+        <file>cover_item.jpg</file>
     </qresource>
 </RCC>