wind: Add a close button to windows using a TGA icon

wind/Mouse.cpp

@@ -43,19 +43,29 @@ void Mouse::update(const moon::MousePacket& packet)
         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))
+            if (window->surface.absolute(window->close_button).contains(m_position))
+            {
+                // Close button pressed
+                g_windows.remove(window);
+                delete window;
+                break;
+            }
+            else if (window->surface.absolute(window->titlebar).contains(m_position))
             {
                 m_dragging_window = window;
-                m_initial_drag_position =
-                    ui::Point { m_position.x - window->surface.pos.x, m_position.y - window->surface.pos.y };
+                m_initial_drag_position = window->surface.relative(m_position);
                 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,
                             m_initial_drag_position.x, m_initial_drag_position.y);
                 window->focus();
+                break;
             }
             else if (window->surface.absolute(window->contents).contains(m_position))
+            {
+                window->focus();
                 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

@@ -2,9 +2,12 @@
 #include <luna/Utf8.h>
 #include <os/File.h>
 #include <ui/Font.h>
+#include <ui/Image.h>
 
 LinkedList<Window> g_windows;
 
+static SharedPtr<ui::Image> g_close_icon;
+
 void Window::draw(ui::Canvas& screen)
 {
     auto window = screen.subcanvas(surface);
@@ -21,6 +24,12 @@ void Window::draw(ui::Canvas& screen)
 
     auto textarea = titlebar_canvas.subcanvas(ui::Rect { 10, 10, titlebar_canvas.width - 10, titlebar_canvas.height });
     font->render(buffer, ui::BLACK, textarea);
+
+    if (g_close_icon)
+    {
+        auto close_area = window.subcanvas(close_button);
+        close_area.fill(g_close_icon->pixels(), g_close_icon->width());
+    }
 }
 
 void Window::focus()
@@ -34,6 +43,9 @@ Window::Window(ui::Rect r, ui::Color c, StringView n) : surface(r), color(c), na
 {
     auto font = ui::Font::default_font();
     titlebar = ui::Rect { 0, 0, surface.width, font->height() + 20 };
+    close_button = ui::Rect { surface.width - 26, 10, 16, 16 };
     contents = ui::Rect { 0, font->height() + 20, surface.width, surface.height - (font->height() + 20) };
     g_windows.append(this);
+
+    if (!g_close_icon) g_close_icon = ui::Image::load("/usr/share/icons/16x16/app-close.tga").value_or({});
 }

wind/Window.h

@@ -9,6 +9,7 @@ struct Window : public LinkedListNode<Window>
 {
     ui::Rect surface;
     ui::Rect titlebar;
+    ui::Rect close_button;
     ui::Rect contents;
     ui::Color color;
     StringView name;