wind+libui+taskbar: Add GetScreenRect IPC, non-decorated windows, taskbar

apps/CMakeLists.txt

@@ -42,3 +42,5 @@ luna_app(touch.cpp touch)
 luna_app(free.cpp free)
 luna_app(gclient.cpp gclient)
 target_link_libraries(gclient PUBLIC ui)
+luna_app(taskbar.cpp taskbar)
+target_link_libraries(taskbar PUBLIC ui)

apps/taskbar.cpp

@@ -0,0 +1,23 @@
+#include <ui/App.h>
+#include <ui/Layout.h>
+
+Result<int> luna_main(int argc, char** argv)
+{
+    ui::App app;
+    TRY(app.init(argc, argv));
+
+    ui::Rect screen = app.screen_rect();
+
+    ui::Rect bar = ui::Rect { ui::Point { 0, screen.height - 50 }, screen.width, 50 };
+
+    auto window = TRY(ui::Window::create(bar, false));
+    app.set_main_window(window);
+    window->set_background(ui::GRAY);
+
+    ui::HorizontalLayout layout(ui::AdjustHeight::Yes, ui::AdjustWidth::No);
+    window->set_main_widget(layout);
+
+    window->draw();
+
+    return app.run();
+}

base/etc/user/00-taskbar

@@ -0,0 +1,4 @@
+Name=taskbar
+Description=Start the taskbar.
+Command=/usr/bin/taskbar
+Restart=true

libui/include/ui/App.h

@@ -23,6 +23,8 @@ namespace ui
         Result<void> init(int, char**);
         Result<int> run();
 
+        Rect screen_rect();
+
         os::LocalClient& client()
         {
             return *m_client;

libui/include/ui/Window.h

@@ -19,7 +19,7 @@ namespace ui
     class Window
     {
       public:
-        static Result<Window*> create(Rect rect);
+        static Result<Window*> create(Rect rect, bool decorated = true);
 
         void set_title(StringView title);
 

libui/include/ui/ipc/Client.h

@@ -19,6 +19,7 @@ namespace ui
         CREATE_WINDOW_RESPONSE_ID,
         WINDOW_CLOSE_REQUEST_ID,
         MOUSE_EVENT_REQUEST_ID,
+        GET_SCREEN_RECT_RESPONSE_ID
     };
 
     struct CreateWindowResponse
@@ -44,4 +45,11 @@ namespace ui
         Point position;
         int buttons;
     };
+
+    struct GetScreenRectResponse
+    {
+        static constexpr u8 ID = GET_SCREEN_RECT_RESPONSE_ID;
+
+        Rect rect;
+    };
 }

libui/include/ui/ipc/Server.h

@@ -22,6 +22,7 @@ namespace ui
         SET_WINDOW_TITLE_ID,
         INVALIDATE_ID,
         CLOSE_WINDOW_ID,
+        GET_SCREEN_RECT_ID,
     };
 
     struct CreateWindowRequest
@@ -30,6 +31,7 @@ namespace ui
         static constexpr u8 ID = CREATE_WINDOW_ID;
 
         ui::Rect rect;
+        bool decorated;
     };
 
     struct SetWindowTitleRequest
@@ -53,4 +55,12 @@ namespace ui
 
         int window;
     };
+
+    struct GetScreenRectRequest
+    {
+        using ResponseType = GetScreenRectResponse;
+        static constexpr u8 ID = GET_SCREEN_RECT_ID;
+
+        int _shadow; // Unused.
+    };
 }

libui/src/App.cpp

@@ -12,6 +12,7 @@
 #include <os/IPC.h>
 #include <ui/App.h>
 #include <ui/ipc/Client.h>
+#include <ui/ipc/Server.h>
 
 Result<void> handle_ipc_client_event(os::LocalClient&, u8 id)
 {
@@ -60,6 +61,13 @@ namespace ui
         return *s_app;
     }
 
+    Rect App::screen_rect()
+    {
+        ui::GetScreenRectRequest request {};
+        auto response = os::IPC::send_sync<ui::GetScreenRectResponse>(*m_client, request).release_value();
+        return response.rect;
+    }
+
     Result<void> App::register_window(OwnedPtr<Window>&& window, Badge<Window>)
     {
         int id = window->id();

libui/src/Window.cpp

@@ -39,12 +39,13 @@ static Result<u32*> create_shm_region(const char* path, int* outfd, ui::Rect rec
 
 namespace ui
 {
-    Result<Window*> Window::create(Rect rect)
+    Result<Window*> Window::create(Rect rect, bool decorated)
     {
         auto window = TRY(make_owned<Window>());
 
         ui::CreateWindowRequest request;
         request.rect = rect;
+        request.decorated = decorated;
         auto response = TRY(os::IPC::send_sync<ui::CreateWindowResponse>(App::the().client(), request));
 
         u32* pixels = TRY(create_shm_region(response.shm_path, nullptr, rect));

wind/IPC.cpp

@@ -1,4 +1,5 @@
 #include "IPC.h"
+#include "Screen.h"
 #include <errno.h>
 #include <luna/Alignment.h>
 #include <luna/String.h>
@@ -87,11 +88,17 @@ static Result<void> handle_create_window_message(Client& client)
     READ_MESSAGE(request);
 
     request.rect = request.rect.normalized();
-    request.rect.height += Window::titlebar_height(); // Make sure we provide the full contents rect that was asked for.
+
+    if (request.decorated)
+    {
+        request.rect.height +=
+            Window::titlebar_height(); // Make sure we provide the full contents rect that was asked for.
+        request.rect.pos.y -= Window::titlebar_height(); // Adjust it so the contents begin at the expected coordinates.
+    }
 
     auto name = TRY(String::from_cstring("Window"));
 
-    auto* window = new (std::nothrow) Window(request.rect, move(name));
+    auto* window = new (std::nothrow) Window(request.rect, move(name), request.decorated);
     if (!window)
     {
         os::IPC::send_error(client.conn, ENOMEM);
@@ -158,6 +165,18 @@ static Result<void> handle_close_window_message(Client& client)
     return {};
 }
 
+static Result<void> handle_get_screen_rect_message(Client& client)
+{
+    ui::GetScreenRectRequest request;
+    READ_MESSAGE(request); // Kinda pointless, but required.
+
+    ui::GetScreenRectResponse response;
+    response.rect = Screen::the().canvas().rect();
+    os::IPC::send_async(client.conn, response);
+
+    return {};
+}
+
 namespace wind
 {
     Result<void> handle_ipc_message(Client& client, u8 id)
@@ -169,6 +188,7 @@ namespace wind
         case ui::SET_WINDOW_TITLE_ID: return handle_set_window_title_message(client);
         case ui::INVALIDATE_ID: return handle_invalidate_message(client);
         case ui::CLOSE_WINDOW_ID: return handle_close_window_message(client);
+        case ui::GET_SCREEN_RECT_ID: return handle_get_screen_rect_message(client);
         default: os::eprintln("wind: Invalid IPC message from client!"); return err(EINVAL);
         }
     }

wind/Screen.cpp

@@ -5,7 +5,9 @@
 #include <sys/mman.h>
 #include <unistd.h>
 
-Result<Screen> Screen::open()
+Screen Screen::s_the;
+
+Result<void> Screen::open()
 {
     int fd = ::open("/dev/fb0", O_RDWR);
     if (fd < 0) return err(errno);
@@ -23,7 +25,9 @@ Result<Screen> Screen::open()
     screen.m_canvas = ui::Canvas::create((u8*)p, width, height);
     screen.m_size = width * height * BYTES_PER_PIXEL;
 
-    return screen;
+    s_the = screen;
+
+    return {};
 }
 
 void Screen::sync()

wind/Screen.h

@@ -7,7 +7,7 @@ constexpr int BYTES_PER_PIXEL = 4;
 class Screen
 {
   public:
-    static Result<Screen> open();
+    static Result<void> open();
 
     ui::Canvas& canvas()
     {
@@ -19,9 +19,16 @@ class Screen
         return m_size;
     }
 
+    static Screen& the()
+    {
+        return s_the;
+    }
+
     void sync();
 
   private:
     ui::Canvas m_canvas;
     int m_size;
+
+    static Screen s_the;
 };

wind/Window.cpp

@@ -41,14 +41,15 @@ void Window::focus()
     g_windows.append(this);
 }
 
-Window::Window(ui::Rect r, String&& n) : surface(r), name(move(n))
+Window::Window(ui::Rect r, String&& n, bool d) : surface(r), name(move(n)), decorated(d)
 {
     auto font = ui::Font::default_font();
-    if (surface.width < 36) surface.width = 36;
-    if (surface.height < (font->height() + 20)) surface.height = font->height() + 20;
-    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) };
+    if (decorated && surface.width < 36) surface.width = 36;
+    if (decorated && surface.height < (font->height() + 20)) surface.height = font->height() + 20;
+    titlebar = decorated ? ui::Rect { 0, 0, surface.width, font->height() + 20 } : ui::Rect { 0, 0, 0, 0 };
+    close_button = decorated ? ui::Rect { surface.width - 26, 10, 16, 16 } : ui::Rect { 0, 0, 0, 0 };
+    contents = decorated ? ui::Rect { 0, font->height() + 20, surface.width, surface.height - (font->height() + 20) }
+                         : ui::Rect { 0, 0, surface.width, surface.height };
     g_windows.append(this);
 }
 

wind/Window.h

@@ -18,10 +18,11 @@ struct Window : public LinkedListNode<Window>
     bool dirty { false };
     Client* client;
     int id;
+    bool decorated;
 
     static int titlebar_height();
 
-    Window(ui::Rect, String&&);
+    Window(ui::Rect, String&&, bool);
     ~Window();
 
     void focus();

wind/main.cpp

@@ -49,7 +49,8 @@ Result<int> luna_main(int argc, char** argv)
     keyboard->set_buffer(os::File::NotBuffered);
     keyboard->set_close_on_exec();
 
-    auto screen = TRY(Screen::open());
+    TRY(Screen::open());
+    auto& screen = Screen::the();
 
     Mouse mouse_pointer { screen.canvas() };