Delegate for ContentManagerView

Added a new delegate to style the view.
Added the following things:
1. Button styling and click to open book
2. Increased size of rows

kiwix-desktop.pro

@@ -34,6 +34,7 @@ DEFINES += QT_DEPRECATED_WARNINGS
 
 
 SOURCES += \
+    src/contentmanagerdelegate.cpp \
     src/contentmanagermodel.cpp \
     src/contenttypefilter.cpp \
     src/findinpagebar.cpp \
@@ -69,6 +70,7 @@ SOURCES += \
     src/static_content.cpp
 
 HEADERS += \
+    src/contentmanagerdelegate.h \
     src/contentmanagermodel.h \
     src/contenttypefilter.h \
     src/findinpagebar.h \

src/contentmanager.cpp

@@ -15,6 +15,7 @@
 #include <zim/error.h>
 #include <zim/item.h>
 #include <QHeaderView>
+#include "contentmanagerdelegate.h"
 
 ContentManager::ContentManager(Library* library, kiwix::Downloader* downloader, QObject *parent)
     : QObject(parent),

src/contentmanagerdelegate.cpp

@@ -0,0 +1,73 @@
+#include <QtGui>
+#include "contentmanagerdelegate.h"
+#include <QApplication>
+#include <QDialog>
+#include <QStyleOptionViewItemV4>
+#include "kiwixapp.h"
+
+ContentManagerDelegate::ContentManagerDelegate(QObject *parent)
+    : QStyledItemDelegate(parent), baseButton(new QPushButton)
+{
+    baseButton->setStyleSheet("background-color: white;"
+                              "border: 0;"
+                              "font-weight: bold;"
+                              "font-family: Selawik;"
+                              "color: blue;"
+                              "margin: 4px;");
+}
+
+
+void ContentManagerDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
+{
+    QStyleOptionButton button;
+    QRect r = option.rect;
+    int x,y,w,h;
+    x = r.left();
+    y = r.top();
+    w = r.width();
+    h = r.height();
+    button.rect = QRect(x,y,w,h);
+    button.text = "Open";
+    button.state = QStyle::State_Enabled;
+    if (index.column() == 5 && index.data(Qt::UserRole+1) == QVariant()) {
+        baseButton->style()->drawControl( QStyle::CE_PushButton, &button, painter, baseButton.data());
+        return;
+    }
+    QStyledItemDelegate::paint(painter, option, index);
+}
+
+bool ContentManagerDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index)
+{
+    if(event->type() == QEvent::MouseButtonRelease )
+    {
+        QMouseEvent * e = (QMouseEvent *)event;
+        int clickX = e->x();
+        int clickY = e->y();
+
+        QRect r = option.rect;//getting the rect of the cell
+        int x,y,w,h;
+        x = r.left();//the X coordinate
+        y = r.top();//the Y coordinate
+        w = r.width();//button width
+        h = r.height();//button height
+
+
+        if(index.column() == 5 && clickX > x && clickX < x + w )
+            if( clickY > y && clickY < y + h )
+            {
+                const auto modeel = index.model();
+                const auto id = modeel->data(index).toString();
+                KiwixApp::instance()->getContentManager()->openBook(id);
+            }
+    }
+
+    return true;
+}
+
+QSize ContentManagerDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
+{
+    if (index.data(Qt::UserRole+1) != QVariant()) {
+        return QSize(300, 70);
+    }
+    return QSize(50, 70);
+}

src/contentmanagerdelegate.h

@@ -0,0 +1,21 @@
+#ifndef CONTENTMANAGERDELEGATE_H
+#define CONTENTMANAGERDELEGATE_H
+
+#include <QStyledItemDelegate>
+#include <QPushButton>
+
+class ContentManagerDelegate : public QStyledItemDelegate
+{
+    Q_OBJECT
+public:
+
+    ContentManagerDelegate(QObject *parent=0);
+    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
+    bool editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index) override;
+    QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override;
+
+private:
+    QScopedPointer<QPushButton> baseButton;
+};
+
+#endif // CONTENTMANAGERDELEGATE_H

src/contentmanagermodel.cpp

@@ -31,7 +31,8 @@ QVariant ContentManagerModel::data(const QModelIndex& index, int role) const
 
     Node *item = static_cast<Node*>(index.internalPointer());
     const auto displayRole = role == Qt::DisplayRole;
-    if (displayRole)
+    const auto additionalInfoRole = role == Qt::UserRole+1 && item->isAdditonal();
+    if (displayRole || additionalInfoRole)
         return item->data(index.column());
 
     return QVariant();

src/contentmanagerview.cpp

@@ -1,9 +1,12 @@
 #include "contentmanagerview.h"
 #include <QFile>
 #include "kiwixapp.h"
+#include "contentmanagerdelegate.h"
 
 ContentManagerView::ContentManagerView(QWidget *parent)
     : QTreeView(parent)
 {
     setSortingEnabled(true);
+    auto managerDelegate = new ContentManagerDelegate();
+    setItemDelegate(managerDelegate);
 }