Add dropping of URLs and text on the data browser view

See issue #441.

src/ExtendedTableWidget.cpp

@@ -155,3 +155,20 @@ void ExtendedTableWidget::cellClicked(const QModelIndex& index)
             emit foreignKeyClicked(fk.table(), fk.columns().size() ? fk.columns().at(0) : "", m->data(index, Qt::EditRole).toByteArray());
     }
 }
+
+void ExtendedTableWidget::dragEnterEvent(QDragEnterEvent* event)
+{
+    event->accept();
+}
+
+void ExtendedTableWidget::dragMoveEvent(QDragMoveEvent* event)
+{
+    event->accept();
+}
+
+void ExtendedTableWidget::dropEvent(QDropEvent* event)
+{
+    QModelIndex index = indexAt(event->pos());
+    model()->dropMimeData(event->mimeData(), Qt::CopyAction, index.row(), index.column(), QModelIndex());
+    event->acceptProposedAction();
+}

src/ExtendedTableWidget.h

@@ -4,6 +4,8 @@
 #include <QTableView>
 #include "FilterTableHeader.h"
 #include <QSet>
+#include <QDropEvent>
+#include <QDragMoveEvent>
 
 class ExtendedTableWidget : public QTableView
 {
@@ -31,6 +33,9 @@ private slots:
 protected:
     virtual void keyPressEvent(QKeyEvent* event);
     virtual void updateGeometries();
+    virtual void dragEnterEvent(QDragEnterEvent* event);
+    virtual void dragMoveEvent(QDragMoveEvent* event);
+    virtual void dropEvent(QDropEvent* event);
 
     FilterTableHeader* m_tableHeader;
 };

src/MainWindow.ui

@@ -182,12 +182,21 @@
         </item>
         <item>
          <widget class="ExtendedTableWidget" name="dataTable">
+          <property name="acceptDrops">
+           <bool>true</bool>
+          </property>
           <property name="whatsThis">
            <string>This is the database view. You can double-click any record to edit its contents in the cell editor window.</string>
           </property>
           <property name="editTriggers">
            <set>QAbstractItemView::NoEditTriggers</set>
           </property>
+          <property name="dragDropMode">
+           <enum>QAbstractItemView::DragDrop</enum>
+          </property>
+          <property name="defaultDropAction">
+           <enum>Qt::CopyAction</enum>
+          </property>
           <attribute name="horizontalHeaderShowSortIndicator" stdset="0">
            <bool>true</bool>
           </attribute>

src/sqlitetablemodel.cpp

@@ -7,6 +7,9 @@
 #include <QMessageBox>
 #include <QApplication>
 #include <QTextCodec>
+#include <QMimeData>
+#include <QFile>
+#include <QUrl>
 
 SqliteTableModel::SqliteTableModel(QObject* parent, DBBrowserDB* db, size_t chunkSize, const QString& encoding)
     : QAbstractTableModel(parent)
@@ -336,7 +339,7 @@ Qt::ItemFlags SqliteTableModel::flags(const QModelIndex& index) const
     if(!index.isValid())
         return Qt::ItemIsEnabled;
 
-    Qt::ItemFlags ret = QAbstractTableModel::flags(index);
+    Qt::ItemFlags ret = QAbstractTableModel::flags(index) | Qt::ItemIsDropEnabled;
 
     // Custom display format set?
     bool custom_display_format = false;
@@ -621,3 +624,29 @@ QByteArray SqliteTableModel::decode(const QByteArray& str) const
     else
         return QTextCodec::codecForName(m_encoding.toUtf8())->toUnicode(str).toUtf8();
 }
+
+Qt::DropActions SqliteTableModel::supportedDropActions() const
+{
+    return Qt::CopyAction;
+}
+
+bool SqliteTableModel::dropMimeData(const QMimeData* data, Qt::DropAction, int row, int column, const QModelIndex& parent)
+{
+    // What has been dropped on the widget?
+    if(data->hasUrls())
+    {
+        // If it's a URL, open the file and paste the content in the current cell
+        QList<QUrl> urls = data->urls();
+        QFile file(urls.first().toLocalFile());
+        if(file.exists() && file.open(QFile::ReadOnly))
+        {
+            setData(index(row, column, parent), file.readAll());
+            return true;
+        }
+    } else if(data->hasText()) {
+        // If it's just text we can set the cell data directly
+        setData(index(row, column, parent), data->text());
+    }
+
+    return false;
+}

src/sqlitetablemodel.h

@@ -50,6 +50,10 @@ public:
 public slots:
     void updateFilter(int column, const QString& value);
 
+protected:
+    virtual Qt::DropActions supportedDropActions() const;
+    virtual bool dropMimeData(const QMimeData* data, Qt::DropAction action, int row, int column, const QModelIndex& parent);
+
 private:
     void fetchData(unsigned int from, unsigned to);
     void clearCache();