Implement an extended table widget to add proper copy to clipboard support

Extend the standard table widget class to make it possible to copy
multiple cells to the clipboard.

src/ExtendedTableWidget.cpp

@@ -0,0 +1,61 @@
+#include <QApplication>
+#include <QClipboard>
+#include <QKeySequence>
+#include <QKeyEvent>
+#include "ExtendedTableWidget.h"
+
+ExtendedTableWidget::ExtendedTableWidget(int rows, int columns, QWidget* parent) :
+    QTableWidget(rows, columns, parent)
+{
+}
+
+
+ExtendedTableWidget::ExtendedTableWidget(QWidget* parent) :
+    QTableWidget(parent)
+{
+}
+
+void ExtendedTableWidget::copy()
+{
+    // Get list of selected items
+    QItemSelectionModel* selection = selectionModel();
+    QModelIndexList indices = selection->selectedIndexes();
+
+    // Abort if there's nothing to copy
+    if(indices.size() == 0)
+        return;
+
+    // Sort the items by row, then by column
+    qSort(indices);
+
+    // Go through all the items...
+    QString result;
+    QModelIndex prev = indices.front();
+    indices.removeFirst();
+    foreach(QModelIndex index, indices)
+    {
+        // Add the content of this cell to the clipboard string
+        result.append(QString("\"%1\"").arg(prev.data().toString()));
+
+        // If this is a new row add a line break, if not add a tab for cell separation
+        if(index.row() != prev.row())
+            result.append("\r\n");
+        else
+            result.append("\t");
+
+        prev = index;
+    }
+    result.append(QString("\"%1\"\r\n").arg(indices.last().data().toString()));      // And the last cell
+
+    // And finally add it to the clipboard
+    qApp->clipboard()->setText(result);
+}
+
+void ExtendedTableWidget::keyPressEvent(QKeyEvent* event)
+{
+    // Call a custom copy method when Ctrl-C is pressed
+    if(event->matches(QKeySequence::Copy))
+        copy();
+    else
+        QTableWidget::keyPressEvent(event);
+}

src/ExtendedTableWidget.h

@@ -0,0 +1,21 @@
+#ifndef __EXTENDEDTABLEWIDGET_H__
+#define __EXTENDEDTABLEWIDGET_H__
+
+#include <QTableWidget>
+
+class ExtendedTableWidget : public QTableWidget
+{
+    Q_OBJECT
+
+public:
+    explicit ExtendedTableWidget(int rows, int columns, QWidget* parent = 0);
+    explicit ExtendedTableWidget(QWidget* parent = 0);
+
+private:
+    void copy();
+
+protected:
+    virtual void keyPressEvent(QKeyEvent* event);
+};
+
+#endif

src/MainWindow.ui

@@ -205,12 +205,12 @@
       </layout>
      </item>
      <item>
-      <widget class="QTableWidget" name="dataTable">
+      <widget class="ExtendedTableWidget" name="dataTable">
        <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="selectionMode">
-        <enum>QAbstractItemView::SingleSelection</enum>
+        <enum>QAbstractItemView::ExtendedSelection</enum>
        </property>
        <property name="horizontalScrollMode">
         <enum>QAbstractItemView::ScrollPerPixel</enum>
@@ -316,8 +316,8 @@
          <rect>
           <x>0</x>
           <y>0</y>
-          <width>763</width>
-          <height>494</height>
+          <width>278</width>
+          <height>444</height>
          </rect>
         </property>
         <layout class="QFormLayout" name="formLayout">
@@ -1399,6 +1399,11 @@
    <extends>QTextEdit</extends>
    <header>sqltextedit.h</header>
   </customwidget>
+  <customwidget>
+   <class>ExtendedTableWidget</class>
+   <extends>QTableWidget</extends>
+   <header>ExtendedTableWidget.h</header>
+  </customwidget>
  </customwidgets>
  <tabstops>
   <tabstop>dbTreeWidget</tabstop>
@@ -2169,5 +2174,6 @@
   <slot>deleteField()</slot>
   <slot>loadPragmas()</slot>
   <slot>savePragmas()</slot>
+  <slot>copy()</slot>
  </slots>
 </ui>

src/src.pro

@@ -24,7 +24,8 @@ HEADERS += \
     ExportCsvDialog.h \
     ImportCsvDialog.h \
     sqltextedit.h \
-    sqlitetypes.h
+    sqlitetypes.h \
+    ExtendedTableWidget.h
 
 SOURCES += \
     sqlitedb.cpp \
@@ -41,7 +42,8 @@ SOURCES += \
     ExportCsvDialog.cpp \
     ImportCsvDialog.cpp \
     sqltextedit.cpp \
-    sqlitetypes.cpp
+    sqlitetypes.cpp \
+    ExtendedTableWidget.cpp
 
 # create a unittest option
 CONFIG(unittest) {