Clock: Turns the clock window from guitest2 into a separate program.

We can't not have a desktop clock app. :^)

Clock/.gitignore

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+*.o
+*.d
+Clock

Clock/ClockWidget.cpp

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+#include <stdio.h>
+#include <time.h>
+#include <SharedGraphics/Painter.h>
+#include "ClockWidget.h"
+
+ClockWidget::ClockWidget(GWidget* parent)
+    : GWidget(parent)
+{
+    set_relative_rect({ 0, 0, 100, 40 });
+    start_timer(300);
+}
+
+ClockWidget::~ClockWidget()
+{
+}
+
+void ClockWidget::paint_event(GPaintEvent&)
+{
+    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::LightGray);
+    painter.draw_text(rect(), timeBuf, Painter::TextAlignment::Center, Color::Black);
+}
+
+void ClockWidget::timer_event(GTimerEvent&)
+{
+    auto now = time(nullptr);
+    if (now == m_last_time)
+        return;
+    m_last_time = now;
+    update();
+}

Clock/ClockWidget.h

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+#pragma once
+
+#include <LibGUI/GWidget.h>
+
+class ClockWidget final : public GWidget {
+public:
+    explicit ClockWidget(GWidget* parent = nullptr);
+    virtual ~ClockWidget() override;
+
+private:
+    virtual void paint_event(GPaintEvent&) override;
+    virtual void timer_event(GTimerEvent&) override;
+
+    time_t m_last_time { 0 };
+};
+

Clock/Makefile

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+OBJS = \
+    ClockWidget.o \
+    main.o
+
+APP = Clock
+
+ARCH_FLAGS =
+STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib -nostdinc
+USERLAND_FLAGS = -ffreestanding -fno-stack-protector -fno-ident
+WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings
+FLAVOR_FLAGS = -march=i386 -mregparm=3 -m32 -fno-exceptions -fno-rtti -fmerge-all-constants -fno-unroll-loops -fno-pie -fno-pic
+OPTIMIZATION_FLAGS = -Oz -fno-asynchronous-unwind-tables
+INCLUDE_FLAGS = -I.. -I. -I../LibC
+
+DEFINES = -DSERENITY -DSANITIZE_PTRS -DUSERLAND
+
+CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(USERLAND_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
+CXX = clang
+LD = ld
+AR = ar
+LDFLAGS = -static --strip-debug -melf_i386 --build-id=none -z norelro -z now -e _start --gc-sections
+
+all: $(APP)
+
+$(APP): $(OBJS)
+	$(LD) -o $(APP) $(LDFLAGS) $(OBJS) ../LibGUI/LibGUI.a ../LibC/LibC.a
+
+.cpp.o:
+	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
+
+-include $(OBJS:%.o=%.d)
+
+clean:
+	@echo "CLEAN"; rm -f $(APPS) $(OBJS) *.d
+

Clock/main.cpp

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+#include <LibGUI/GEventLoop.h>
+#include <LibGUI/GWindow.h>
+#include "ClockWidget.h"
+
+int main(int, char**)
+{
+    GEventLoop loop;
+
+    auto* window = new GWindow;
+    window->set_title("Clock");
+    window->set_rect({ 100, 100, 100, 40 });
+
+    auto* clock_widget = new ClockWidget;
+    clock_widget->set_relative_rect({ 0, 0, 100, 40 });
+    window->set_main_widget(clock_widget);
+
+    window->show();
+    return loop.exec();
+}
+
+