ui: basic search view

- Added a basic SearchView (+ controller and qt implementation)
- SearchView can set the active element of other views by dispatching a message.
- SearchView adjusts its text when the active element is changed by other views.
- Added wrappers for Button and EditBox that allow the usage of simple callback functions.

src/app/qt/element/QtButton.cpp

@@ -0,0 +1,23 @@
+#include "qt/element/QtButton.h"
+
+QtButton::QtButton(QWidget *parent)
+	: QPushButton(parent)
+	, m_onClick(nullptr)
+{
+	connect(this, SIGNAL(clicked()), this, SLOT(slotOnClick()));
+}
+
+QtButton::~QtButton()
+{
+}
+
+void QtButton::setCallbackOnClick(std::function<void(void)> callback)
+{
+	m_onClick = callback;
+}
+
+void QtButton::slotOnClick()
+{
+	if (m_onClick)
+		m_onClick();
+}

src/app/qt/element/QtButton.h

@@ -0,0 +1,25 @@
+#ifndef QT_BUTTON_H
+#define QT_BUTTON_H
+
+#include <functional>
+
+#include <QPushButton>
+
+class QtButton: public QPushButton
+{
+	Q_OBJECT
+
+public:
+	QtButton(QWidget *parent);
+	~QtButton();
+
+	void setCallbackOnClick(std::function<void(void)> callback);
+
+private slots:
+	void slotOnClick();
+
+private:
+	std::function<void(void)> m_onClick;
+};
+
+#endif // QT_BUTTON_H

src/app/qt/element/QtEditBox.cpp

@@ -0,0 +1,23 @@
+#include "qt/element/QtEditBox.h"
+
+QtEditBox::QtEditBox(QWidget *parent)
+	: QLineEdit(parent)
+	, m_onReturnPressed(nullptr)
+{
+	connect(this, SIGNAL(returnPressed()), this, SLOT(slotOnReturnPressed()));
+}
+
+QtEditBox::~QtEditBox()
+{
+}
+
+void QtEditBox::setCallbackOnReturnPressed(std::function<void(void)> callback)
+{
+	m_onReturnPressed = callback;
+}
+
+void QtEditBox::slotOnReturnPressed()
+{
+	if (m_onReturnPressed)
+		m_onReturnPressed();
+}

src/app/qt/element/QtEditBox.h

@@ -0,0 +1,25 @@
+#ifndef QT_EDIT_BOX_H
+#define QT_EDIT_BOX_H
+
+#include <functional>
+
+#include <QLineEdit>
+
+class QtEditBox: public QLineEdit
+{
+	Q_OBJECT
+
+public:
+	QtEditBox(QWidget *parent);
+	~QtEditBox();
+
+	void setCallbackOnReturnPressed(std::function<void(void)> callback);
+
+private slots:
+	void slotOnReturnPressed();
+
+private:
+	std::function<void(void)> m_onReturnPressed;
+};
+
+#endif // QT_EDIT_BOX_H