Libraries: Create top level directory for libraries.

Things were getting a little crowded in the project root, so this patch
moves the Lib*/ directories into Libraries/.

Libraries/LibGUI/GProgressBar.cpp

@@ -0,0 +1,80 @@
+#include <AK/StringBuilder.h>
+#include <LibGUI/GPainter.h>
+#include <LibGUI/GProgressBar.h>
+
+GProgressBar::GProgressBar(GWidget* parent)
+    : GFrame(parent)
+{
+    set_frame_shape(FrameShape::Container);
+    set_frame_shadow(FrameShadow::Sunken);
+    set_frame_thickness(2);
+}
+
+GProgressBar::~GProgressBar()
+{
+}
+
+void GProgressBar::set_value(int value)
+{
+    if (m_value == value)
+        return;
+    m_value = value;
+    update();
+}
+
+void GProgressBar::set_range(int min, int max)
+{
+    ASSERT(min < max);
+    m_min = min;
+    m_max = max;
+    if (m_value > m_max)
+        m_value = m_max;
+    if (m_value < m_min)
+        m_value = m_min;
+}
+
+void GProgressBar::paint_event(GPaintEvent& event)
+{
+    GFrame::paint_event(event);
+
+    GPainter painter(*this);
+    auto rect = frame_inner_rect();
+    painter.add_clip_rect(rect);
+    painter.add_clip_rect(event.rect());
+
+    // First we fill the entire widget with the gradient. This incurs a bit of
+    // overdraw but ensures a consistent look throughout the progression.
+    Color start_color(110, 34, 9);
+    Color end_color(244, 202, 158);
+    painter.fill_rect_with_gradient(rect, start_color, end_color);
+
+    float range_size = m_max - m_min;
+    float progress = (m_value - m_min) / range_size;
+
+    String progress_text;
+    if (m_format != Format::NoText) {
+        // Then we draw the progress text over the gradient.
+        // We draw it twice, once offset (1, 1) for a drop shadow look.
+        StringBuilder builder;
+        builder.append(m_caption);
+        if (m_format == Format::Percentage)
+            builder.appendf("%d%%", (int)(progress * 100));
+        else if (m_format == Format::ValueSlashMax)
+            builder.appendf("%d/%d", m_value, m_max);
+
+        progress_text = builder.to_string();
+
+        painter.draw_text(rect.translated(1, 1), progress_text, TextAlignment::Center, Color::Black);
+        painter.draw_text(rect, progress_text, TextAlignment::Center, Color::White);
+    }
+
+    // Then we carve out a hole in the remaining part of the widget.
+    // We draw the text a third time, clipped and inverse, for sharp contrast.
+    float progress_width = progress * width();
+    Rect hole_rect { (int)progress_width, 0, (int)(width() - progress_width), height() };
+    painter.add_clip_rect(hole_rect);
+    painter.fill_rect(hole_rect, Color::White);
+
+    if (m_format != Format::NoText)
+        painter.draw_text(rect.translated(0, 0), progress_text, TextAlignment::Center, Color::Black);
+}