Move Widget & friends into LibGUI.

LibGUI/ClockWidget.cpp

@@ -0,0 +1,37 @@
+#include "ClockWidget.h"
+#include "Painter.h"
+#include <time.h>
+
+ClockWidget::ClockWidget(Widget* parent)
+    : Widget(parent)
+{
+    setWindowRelativeRect({ 0, 0, 100, 40 });
+    startTimer(250);
+}
+
+ClockWidget::~ClockWidget()
+{
+}
+
+void ClockWidget::paintEvent(PaintEvent&)
+{
+    auto now = time(nullptr);
+    auto& tm = *localtime(&now);
+    
+    char timeBuf[128];
+    sprintf(timeBuf, "%02u:%02u:%02u ", tm.tm_hour, tm.tm_min, tm.tm_sec);
+    
+    Painter painter(*this);
+    painter.fill_rect(rect(), Color::MidGray);
+    painter.draw_text(rect(), timeBuf, Painter::TextAlignment::Center, Color::Black);
+}
+
+void ClockWidget::timerEvent(TimerEvent&)
+{
+    auto now = time(nullptr);
+    if (now == m_lastSeenTimestamp)
+        return;
+    m_lastSeenTimestamp = now;
+    update();
+}
+