libui: Add basic widget and layout system =D

apps/gclient.cpp

@@ -1,4 +1,27 @@
 #include <ui/App.h>
+#include <ui/Layout.h>
+
+struct ColorWidget : public ui::Widget
+{
+  public:
+    ColorWidget(ui::Color color) : m_color(color)
+    {
+    }
+
+    Result<ui::EventResult> handle_mousemove(ui::Point) override
+    {
+        return ui::EventResult::DidNotHandle;
+    }
+
+    Result<void> draw(ui::Canvas& canvas) override
+    {
+        canvas.fill(m_color);
+        return {};
+    }
+
+  private:
+    ui::Color m_color;
+};
 
 Result<int> luna_main(int argc, char** argv)
 {
@@ -9,13 +32,25 @@ Result<int> luna_main(int argc, char** argv)
     app.set_main_window(window);
 
     window->set_title("Main Window");
-    window->canvas().fill(ui::CYAN);
-    window->update();
+    window->set_background(ui::CYAN);
 
-    auto* dialog = TRY(ui::Window::create(ui::Rect { 400, 400, 200, 150 }));
-    dialog->set_title("Error: Unknown Error");
-    dialog->canvas().fill(ui::RED);
-    dialog->update();
+    ui::HorizontalLayout layout;
+    window->set_main_widget(layout);
+
+    ColorWidget green(ui::GREEN);
+    layout.add_widget(green);
+    ColorWidget blue(ui::BLUE);
+    layout.add_widget(blue);
+
+    ui::HorizontalLayout sublayout;
+    layout.add_widget(sublayout);
+
+    ColorWidget red(ui::RED);
+    sublayout.add_widget(red);
+    ColorWidget white(ui::WHITE);
+    sublayout.add_widget(white);
+
+    window->draw();
 
     return app.run();
 }

libui/CMakeLists.txt

@@ -12,6 +12,7 @@ set(SOURCES
     src/Image.cpp
     src/App.cpp
     src/Window.cpp
+    src/Layout.cpp
 )
 
 add_library(ui ${SOURCES})

libui/include/ui/Layout.h

@@ -0,0 +1,45 @@
+/**
+ * @file Layout.h
+ * @author apio (cloudapio.eu)
+ * @brief Layout widgets to organize content.
+ *
+ * @copyright Copyright (c) 2023, the Luna authors.
+ *
+ */
+
+#pragma once
+#include <luna/Vector.h>
+#include <ui/Widget.h>
+
+namespace ui
+{
+    enum class AdjustHeight
+    {
+        No,
+        Yes
+    };
+
+    enum class AdjustWidth
+    {
+        No,
+        Yes
+    };
+
+    class HorizontalLayout final : public Widget
+    {
+      public:
+        HorizontalLayout(AdjustHeight adjust_height = AdjustHeight::Yes, AdjustWidth adjust_width = AdjustWidth::Yes);
+
+        Result<EventResult> handle_mousemove(Point position) override;
+
+        Result<void> draw(Canvas& canvas) override;
+
+        Result<void> add_widget(Widget& widget);
+
+      private:
+        Vector<Widget*> m_widgets;
+        AdjustHeight m_adjust_height;
+        AdjustWidth m_adjust_width;
+        int m_used_width;
+    };
+}

libui/include/ui/Widget.h

@@ -0,0 +1,65 @@
+/**
+ * @file Widget.h
+ * @author apio (cloudapio.eu)
+ * @brief Abstract widget class.
+ *
+ * @copyright Copyright (c) 2023, the Luna authors.
+ *
+ */
+
+#pragma once
+#include <luna/Result.h>
+#include <ui/Canvas.h>
+#include <ui/Point.h>
+#include <ui/Rect.h>
+
+namespace ui
+{
+    class Window;
+
+    enum class EventResult
+    {
+        DidHandle,
+        DidNotHandle,
+    };
+
+    class Widget
+    {
+      public:
+        virtual Result<EventResult> handle_mousemove(Point position);
+
+        virtual Result<void> draw(Canvas& canvas);
+
+        void set_window(Window* window, Rect rect, Badge<Window>)
+        {
+            m_window = window;
+            m_rect = rect;
+        }
+
+        void set_parent(Widget* parent)
+        {
+            m_parent = parent;
+            m_window = parent->m_window;
+        }
+
+        Widget* parent()
+        {
+            return m_parent;
+        }
+
+        Window* window()
+        {
+            return m_window;
+        }
+
+        Rect& rect()
+        {
+            return m_rect;
+        }
+
+      protected:
+        Widget* m_parent { nullptr };
+        Window* m_window;
+        Rect m_rect { 0, 0, 50, 50 };
+    };
+}

libui/include/ui/Window.h

@@ -12,6 +12,7 @@
 #include <luna/StringView.h>
 #include <ui/Canvas.h>
 #include <ui/Rect.h>
+#include <ui/Widget.h>
 
 namespace ui
 {
@@ -22,6 +23,18 @@ namespace ui
 
         void set_title(StringView title);
 
+        void set_background(Color color)
+        {
+            m_background = color;
+        }
+
+        void set_main_widget(Widget& widget)
+        {
+            check(!m_main_widget);
+            widget.set_window(this, m_canvas.rect(), {});
+            m_main_widget = &widget;
+        }
+
         Canvas& canvas()
         {
             return m_canvas;
@@ -31,6 +44,9 @@ namespace ui
 
         void close();
 
+        Result<void> draw();
+        Result<void> handle_mousemove(ui::Point position);
+
         int id() const
         {
             return m_id;
@@ -41,5 +57,7 @@ namespace ui
       private:
         int m_id;
         Canvas m_canvas;
+        Widget* m_main_widget { nullptr };
+        Color m_background { ui::BLACK };
     };
 }

libui/src/App.cpp

@@ -95,7 +95,9 @@ namespace ui
         case MOUSE_EVENT_REQUEST_ID: {
             MouseEventRequest request;
             TRY(m_client->recv_typed(request));
-            os::eprintln("ui: Mouse move to (%d, %d)", request.position.x, request.position.y);
+            auto* window = find_window(request.window);
+            window->handle_mousemove(request.position);
+            window->draw();
             return {};
         }
         default: fail("Unexpected IPC request from server!");

libui/src/Layout.cpp

@@ -0,0 +1,72 @@
+/**
+ * @file Layout.cpp
+ * @author apio (cloudapio.eu)
+ * @brief Layout widgets to organize content.
+ *
+ * @copyright Copyright (c) 2023, the Luna authors.
+ *
+ */
+
+#include <stdlib.h>
+#include <ui/Layout.h>
+
+namespace ui
+{
+    HorizontalLayout::HorizontalLayout(AdjustHeight adjust_height, AdjustWidth adjust_width)
+        : m_adjust_height(adjust_height), m_adjust_width(adjust_width)
+    {
+    }
+
+    Result<EventResult> HorizontalLayout::handle_mousemove(Point position)
+    {
+        for (auto widget : m_widgets)
+        {
+            if (widget->rect().contains(position)) return widget->handle_mousemove(position);
+        }
+
+        return ui::EventResult::DidNotHandle;
+    }
+
+    Result<void> HorizontalLayout::draw(Canvas& canvas)
+    {
+        for (auto widget : m_widgets)
+        {
+            ui::Rect rect = { m_rect.relative(widget->rect().pos), widget->rect().width, widget->rect().height };
+            auto subcanvas = canvas.subcanvas(rect);
+            TRY(widget->draw(subcanvas));
+        }
+
+        return {};
+    }
+
+    Result<void> HorizontalLayout::add_widget(Widget& widget)
+    {
+        TRY(m_widgets.try_append(&widget));
+
+        if (m_adjust_width == AdjustWidth::No)
+        {
+            widget.rect().pos.x = m_rect.pos.x + m_used_width;
+            m_used_width += widget.rect().width;
+        }
+        else
+        {
+            int used_width = 0;
+            div_t result = div(m_rect.width, (int)m_widgets.size());
+            for (auto w : m_widgets)
+            {
+                w->rect().pos.x = m_rect.pos.x + used_width;
+                w->rect().width = result.quot;
+                used_width += result.quot;
+            }
+            m_widgets[m_widgets.size() - 1]->rect().width += result.rem;
+        }
+
+        widget.rect().pos.y = m_rect.pos.y;
+
+        if (m_adjust_height == AdjustHeight::Yes) { widget.rect().height = m_rect.height; }
+
+        widget.set_parent(this);
+
+        return {};
+    }
+}

libui/src/Window.cpp

@@ -91,4 +91,17 @@ namespace ui
 
         app.unregister_window(this, {});
     }
+
+    Result<void> Window::draw()
+    {
+        if (m_main_widget) return m_main_widget->draw(m_canvas);
+        update();
+        return {};
+    }
+
+    Result<void> Window::handle_mousemove(ui::Point position)
+    {
+        if (m_main_widget) TRY(m_main_widget->handle_mousemove(position));
+        return {};
+    }
 }