wind: Add window titlebars using ui::Font

wind/Mouse.cpp

@@ -33,22 +33,29 @@ void Mouse::update(const moon::MousePacket& packet)
     {
         m_dragging_window->surface.pos =
             ui::Point { m_position.x - m_initial_drag_position.x, m_position.y - m_initial_drag_position.y };
-        m_dragging_window->surface = m_dragging_window->surface.absolute();
+        m_dragging_window->surface = m_dragging_window->surface.normalized();
     }
 
     else if ((packet.buttons & moon::MouseButton::Left) && !m_dragging_window)
     {
-        g_windows.for_each_reversed([this](Window* window) {
-            if (!this->m_dragging_window && window->surface.contains(this->m_position))
+        // Iterate from the end of the list, since windows at the beginning are stacked at the bottom and windows at the
+        // top are at the end.
+        for (Window* window = g_windows.last().value_or(nullptr); window;
+             window = g_windows.previous(window).value_or(nullptr))
+        {
+            if (window->surface.absolute(window->titlebar).contains(m_position))
             {
-                this->m_dragging_window = window;
-                this->m_initial_drag_position = ui::Point { this->m_position.x - window->surface.pos.x,
-                                                            this->m_position.y - window->surface.pos.y };
+                m_dragging_window = window;
+                m_initial_drag_position =
+                    ui::Point { m_position.x - window->surface.pos.x, m_position.y - window->surface.pos.y };
                 os::println("Started drag: window at (%d,%d,%d,%d) with offset (%d,%d)", window->surface.pos.x,
                             window->surface.pos.y, window->surface.width, window->surface.height,
-                            this->m_initial_drag_position.x, this->m_initial_drag_position.y);
+                            m_initial_drag_position.x, m_initial_drag_position.y);
                 window->focus();
             }
-        });
+            else if (window->surface.absolute(window->contents).contains(m_position))
+                break; // We don't want to continue iterating, otherwise this would take into account windows whose
+                       // titlebar is underneath another window's contents!
+        }
     }
 }

wind/Window.cpp

@@ -1,10 +1,26 @@
 #include "Window.h"
+#include <luna/Utf8.h>
+#include <os/File.h>
+#include <ui/Font.h>
 
 LinkedList<Window> g_windows;
 
 void Window::draw(ui::Canvas& screen)
 {
-    screen.subcanvas(surface).fill(color);
+    auto window = screen.subcanvas(surface);
+    window.subcanvas(contents).fill(color);
+
+    wchar_t buffer[4096];
+    Utf8StringDecoder decoder(name.chars());
+    decoder.decode(buffer, sizeof(buffer)).release_value();
+
+    auto font = ui::Font::default_font();
+
+    auto titlebar_canvas = window.subcanvas(titlebar);
+    titlebar_canvas.fill(ui::GRAY);
+
+    auto textarea = titlebar_canvas.subcanvas(ui::Rect { 10, 10, titlebar_canvas.width - 10, titlebar_canvas.height });
+    font->render(buffer, ui::BLACK, textarea);
 }
 
 void Window::focus()
@@ -14,7 +30,10 @@ void Window::focus()
     g_windows.append(this);
 }
 
-Window::Window(ui::Rect r, ui::Color c) : surface(r), color(c)
+Window::Window(ui::Rect r, ui::Color c, StringView n) : surface(r), color(c), name(n)
 {
+    auto font = ui::Font::default_font();
+    titlebar = ui::Rect { 0, 0, surface.width, font->height() + 20 };
+    contents = ui::Rect { 0, font->height() + 20, surface.width, surface.height - (font->height() + 20) };
     g_windows.append(this);
 }

wind/Window.h

@@ -1,5 +1,6 @@
 #pragma once
 #include <luna/LinkedList.h>
+#include <luna/StringView.h>
 #include <ui/Canvas.h>
 #include <ui/Color.h>
 #include <ui/Rect.h>
@@ -7,9 +8,12 @@
 struct Window : public LinkedListNode<Window>
 {
     ui::Rect surface;
+    ui::Rect titlebar;
+    ui::Rect contents;
     ui::Color color;
+    StringView name;
 
-    Window(ui::Rect, ui::Color);
+    Window(ui::Rect, ui::Color, StringView);
 
     void focus();
 

wind/main.cpp

@@ -72,9 +72,9 @@ Result<int> luna_main(int argc, char** argv)
 
     ui::Color background = ui::BLACK;
 
-    TRY(make<Window>(ui::Rect { 200, 200, 600, 400 }, ui::GREEN));
-    TRY(make<Window>(ui::Rect { 100, 100, 300, 200 }, ui::RED));
-    TRY(make<Window>(ui::Rect { 600, 130, 350, 250 }, ui::CYAN));
+    TRY(make<Window>(ui::Rect { 200, 200, 600, 400 }, ui::GREEN, "Calculator"_sv));
+    TRY(make<Window>(ui::Rect { 100, 100, 300, 200 }, ui::RED, "Settings"_sv));
+    TRY(make<Window>(ui::Rect { 600, 130, 350, 250 }, ui::CYAN, "File Manager"_sv));
 
     Vector<SharedPtr<os::LocalServer::Client>> clients;