refactoring qad widgets part 1

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

libs/widgets/clineedit.cpp

@@ -1,5 +1,7 @@
 #include "clineedit.h"
 #include "qad_types.h"
+#include <QMouseEvent>
+#include <QPainter>
 
 
 CLineEdit::CLineEdit(QWidget * parent): QLineEdit(parent) {
@@ -9,7 +11,7 @@ CLineEdit::CLineEdit(QWidget * parent): QLineEdit(parent) {
 	cw->setToolTip(tr("Clear"));
 	cw->hide();
 	cw->installEventFilter(this);
-	connect(this, SIGNAL(textChanged(QString)), this, SLOT(textChanged_(QString)));
+	connect(this, &QLineEdit::textChanged, this, &CLineEdit::textChangedSlot);
 	int is = fontHeight(this);
 	QMargins m = textMargins();
 	m.setRight(m.right() + (is * 1.2));
@@ -17,10 +19,15 @@ CLineEdit::CLineEdit(QWidget * parent): QLineEdit(parent) {
 }
 
 
+CLineEdit::~CLineEdit() {
+	delete cw;
+}
+
+
 bool CLineEdit::eventFilter(QObject * o, QEvent * e) {
 	switch (e->type()) {
 	case QEvent::MouseButtonRelease:
-		clearMouseRelease((QMouseEvent * )e);
+		clearMouseRelease(static_cast<QMouseEvent *>(e));
 		break;
 	case QEvent::Paint:
 		cwPaintEvent();
@@ -62,5 +69,17 @@ void CLineEdit::setDefaultText(const QString & t, bool set_text) {
 		cw->hide();
 		return;
 	}
-	textChanged_(text());
+	textChangedSlot(text());
+}
+
+
+void CLineEdit::clearMouseRelease(QMouseEvent *e) {
+	if (cw->rect().contains(e->pos())) {
+		clearClick();
+	}
+}
+
+
+void CLineEdit::textChangedSlot(QString text) {
+	cw->setVisible(text != dt);
 }