refactoring qad widgets part 2

c++ cast, nullptr, forward declaration, agregate ui, connect to member functions, order and clear includes

libs/widgets/matrixedit.cpp

@@ -26,13 +26,14 @@ bool MatrixEdit::isReadOnly() const {
 
 void MatrixEdit::setReadOnly(bool yes) {
 	ro = yes;
-	/// TODO
+	/// TODO : readonly not implemented
 }
 
 
 void MatrixEdit::setVectorMode(bool yes) {
-	if (yes)
+	if (yes) {
 		ui->spinCols->setValue(1);
+	}
 	ui->labelCols->setHidden(yes);
 	ui->spinCols->setHidden(yes);
 	ui->buttonIdentity->setHidden(yes);
@@ -74,7 +75,9 @@ QVector<double> MatrixEdit::vector() const {
 	ret.fill(0.);
 	for (int r = 0; r < ret.size(); ++r) {
 		QTableWidgetItem * i = ui->table->item(r, 0);
-		if (!i) continue;
+		if (!i) {
+			continue;
+		}
 		ret[r] = i->text().toDouble();
 	}
 	return ret;
@@ -91,7 +94,9 @@ QVector<QVector<double> > MatrixEdit::matrix() const {
 		ret[r].fill(0.);
 		for (int c = 0; c < cc; ++c) {
 			QTableWidgetItem * i = ui->table->item(r, c);
-			if (!i) continue;
+			if (!i) {
+				continue;
+			}
 			ret[r][c] = i->text().toDouble();
 		}
 	}