Add printer functionality to SQL queries.

Currently it pops up a preview dialog, which is good enough for the time
being.

admin/mainwindow.cpp

@@ -18,6 +18,12 @@
 
 #include <QFileInfo>
 
+#include <QPrinter>
+#include <QPrintDialog>
+#include <QPrintPreviewDialog>
+#include <QPainter>
+#include "tableprinter.h"
+
 #include <cstring>
 
 #include "comboboxitemdelegate.h"
@@ -1013,3 +1019,40 @@ void MainWindow::on_sqlOutReload_clicked()
     model->setQuery(ui->sqlEdit->toPlainText());
     ui->tabWidget_2->setCurrentIndex(0);
 }
+
+void MainWindow::printTable(QPrinter* printer)
+{
+    QPainter painter;
+    if (!painter.begin(printer)) {
+        qWarning() << "can't start printer";
+        return;
+    }
+
+    QSqlQueryModel* model = (QSqlQueryModel*) ui->sqlOutput->model();
+
+    TablePrinter tablePrinter(&painter, printer);
+
+    QVector<int> columnStretch = QVector<int>();
+    QVector<QString> headers = QVector<QString>();
+    for (int i = 0; i <  model->columnCount(); i++) {
+        columnStretch << 1;
+        headers << model->headerData(i, Qt::Horizontal).toString();
+    }
+
+    QFont headerFont;
+    headerFont.setBold(true);
+    tablePrinter.setHeadersFont(headerFont);
+
+    if (!tablePrinter.printTable(ui->sqlOutput->model(), columnStretch, headers)) {
+        qDebug() << tablePrinter.lastError();
+    }
+
+    painter.end();
+}
+
+void MainWindow::on_sqlPrint_clicked()
+{
+    QPrintPreviewDialog dialog;
+    connect(&dialog, SIGNAL(paintRequested(QPrinter*)), this, SLOT(printTable(QPrinter*)));
+    dialog.exec();
+}

admin/mainwindow.h

@@ -5,6 +5,7 @@
 #include <QSqlTableModel>
 #include <QSqlRelationalTableModel>
 #include <QTableView>
+#include <QPrinter>
 
 #include "disablingmodel.h"
 
@@ -93,6 +94,10 @@ private slots:
 
     void on_sqlOutReload_clicked();
 
+    void on_sqlPrint_clicked();
+
+    void printTable(QPrinter* printer);
+
 private:
     Ui::MainWindow *ui;
     QSqlTableModel* model;