taskbar: Add Game of Life to taskbar

This allows components like Buttons to take in capturing lambdas

apps/taskbar.cpp

@@ -15,6 +15,26 @@ void sigchld_handler(int)
     wait(nullptr);
 }
 
+Result<void> create_widget_group_for_app(ui::HorizontalLayout& layout, Slice<StringView> args, StringView icon)
+{
+    auto* button = new (std::nothrow) ui::Button({ 0, 0, 50, 50 });
+    if (!button) return err(ENOMEM);
+    layout.add_widget(*button);
+
+    auto* container = new (std::nothrow)
+        ui::Container({ 0, 0, 50, 50 }, ui::VerticalAlignment::Center, ui::HorizontalAlignment::Center);
+    if (!container) return err(ENOMEM);
+    button->set_widget(*container);
+    button->set_action([=] { os::Process::spawn(args[0], args, false); });
+
+    auto image = TRY(ui::ImageWidget::load(icon));
+    container->set_widget(*image);
+
+    image.leak();
+
+    return {};
+}
+
 Result<int> luna_main(int argc, char** argv)
 {
     ui::App app;
@@ -30,34 +50,17 @@ Result<int> luna_main(int argc, char** argv)
     app.set_main_window(window);
     window->set_background(TASKBAR_COLOR);
 
-    ui::HorizontalLayout layout(ui::AdjustHeight::Yes, ui::AdjustWidth::No);
+    ui::HorizontalLayout layout(ui::Margins { 0, 0, 0, 0 }, ui::AdjustHeight::Yes, ui::AdjustWidth::No);
     window->set_main_widget(layout);
 
-    ui::Button term_button({ 0, 0, 50, 50 });
-    layout.add_widget(term_button);
+    StringView terminal_command[] = { "/usr/bin/terminal" };
+    TRY(create_widget_group_for_app(layout, { terminal_command, 1 }, "/usr/share/icons/32x32/app-terminal.tga"));
 
-    ui::Container term_container({ 0, 0, 50, 50 }, ui::VerticalAlignment::Center, ui::HorizontalAlignment::Center);
-    term_button.set_widget(term_container);
-    term_button.set_action([] {
-        StringView args[] = { "/usr/bin/terminal" };
-        os::Process::spawn("/usr/bin/terminal", Slice<StringView> { args, 1 }, false);
-    });
+    StringView about_command[] = { "/usr/bin/about" };
+    TRY(create_widget_group_for_app(layout, { about_command, 1 }, "/usr/share/icons/32x32/app-about.tga"));
 
-    auto term_image = TRY(ui::ImageWidget::load("/usr/share/icons/32x32/app-terminal.tga"));
-    term_container.set_widget(*term_image);
-
-    ui::Button about_button({ 0, 0, 50, 50 });
-    layout.add_widget(about_button);
-
-    ui::Container about_container({ 0, 0, 50, 50 }, ui::VerticalAlignment::Center, ui::HorizontalAlignment::Center);
-    about_button.set_widget(about_container);
-    about_button.set_action([] {
-        StringView args[] = { "/usr/bin/about" };
-        os::Process::spawn("/usr/bin/about", Slice<StringView> { args, 1 }, false);
-    });
-
-    auto about_image = TRY(ui::ImageWidget::load("/usr/share/icons/32x32/app-about.tga"));
-    about_container.set_widget(*about_image);
+    StringView gol_command[] = { "/usr/bin/gol" };
+    TRY(create_widget_group_for_app(layout, { gol_command, 1 }, "/usr/share/icons/32x32/app-gol.tga"));
 
     window->draw();
 

libluna/include/luna/OwnedPtr.h

@@ -49,6 +49,13 @@ template <typename T> class OwnedPtr
         return m_ptr;
     }
 
+    T* leak()
+    {
+        T* ptr = m_ptr;
+        m_ptr = nullptr;
+        return ptr;
+    }
+
     T* operator->() const
     {
         return m_ptr;

libui/include/ui/Action.h

@@ -0,0 +1,68 @@
+#pragma once
+#include <luna/Heap.h>
+
+namespace ui
+{
+    class Action
+    {
+      public:
+        Action()
+        {
+            m_action = nullptr;
+        }
+
+        Action(Action&& other) : m_action(other.m_action)
+        {
+            other.m_action = nullptr;
+        }
+
+        template <typename T> Action(T&& function)
+        {
+            m_action = new (std::nothrow) ActionImpl<T>(move(function));
+        }
+
+        template <typename T> Action& operator=(T&& function)
+        {
+            if (m_action) delete m_action;
+            m_action = new (std::nothrow) ActionImpl<T>(move(function));
+            return *this;
+        }
+
+        void operator()()
+        {
+            check(m_action);
+            return m_action->call();
+        }
+
+        ~Action()
+        {
+            if (m_action) delete m_action;
+        }
+
+      private:
+        class ActionBase
+        {
+          public:
+            virtual void call() = 0;
+            virtual ~ActionBase() = default;
+        };
+
+        template <typename T> class ActionImpl final : public ActionBase
+        {
+          public:
+            ActionImpl(T&& function) : m_function(move(function))
+            {
+            }
+
+            void call()
+            {
+                return m_function();
+            }
+
+          private:
+            T m_function;
+        };
+
+        ActionBase* m_action;
+    };
+}

libui/include/ui/Button.h

@@ -8,6 +8,7 @@
  */
 
 #pragma once
+#include <ui/Action.h>
 #include <ui/Widget.h>
 
 namespace ui
@@ -18,7 +19,7 @@ namespace ui
         Button(Rect rect);
 
         void set_widget(Widget& widget);
-        void set_action(void (*action)(void));
+        void set_action(Action&& action);
 
         Result<EventResult> handle_mouse_move(Point position) override;
         Result<EventResult> handle_mouse_leave() override;
@@ -31,6 +32,6 @@ namespace ui
         bool m_hovered { false };
         bool m_clicked { false };
         Widget* m_child;
-        void (*m_action)(void);
+        Action m_action;
     };
 }

libui/include/ui/Layout.h

@@ -25,10 +25,19 @@ namespace ui
         Yes
     };
 
+    struct Margins
+    {
+        int left;
+        int right;
+        int top;
+        int bottom;
+    };
+
     class HorizontalLayout final : public Widget
     {
       public:
-        HorizontalLayout(AdjustHeight adjust_height = AdjustHeight::Yes, AdjustWidth adjust_width = AdjustWidth::Yes);
+        HorizontalLayout(Margins margins = Margins { 0, 0, 0, 0 }, AdjustHeight adjust_height = AdjustHeight::Yes,
+                         AdjustWidth adjust_width = AdjustWidth::Yes);
 
         Result<EventResult> handle_mouse_move(Point position) override;
         Result<EventResult> handle_mouse_leave() override;
@@ -42,6 +51,7 @@ namespace ui
 
       private:
         Vector<Widget*> m_widgets;
+        Margins m_margins;
         AdjustHeight m_adjust_height;
         AdjustWidth m_adjust_width;
         int m_used_width { 0 };
@@ -50,7 +60,8 @@ namespace ui
     class VerticalLayout final : public Widget
     {
       public:
-        VerticalLayout(AdjustHeight adjust_height = AdjustHeight::Yes, AdjustWidth adjust_width = AdjustWidth::Yes);
+        VerticalLayout(Margins margins = Margins { 0, 0, 0, 0 }, AdjustHeight adjust_height = AdjustHeight::Yes,
+                       AdjustWidth adjust_width = AdjustWidth::Yes);
 
         Result<EventResult> handle_mouse_move(Point position) override;
         Result<EventResult> handle_mouse_leave() override;
@@ -64,6 +75,7 @@ namespace ui
 
       private:
         Vector<Widget*> m_widgets;
+        Margins m_margins;
         AdjustHeight m_adjust_height;
         AdjustWidth m_adjust_width;
         int m_used_height { 0 };

libui/src/Button.cpp

@@ -24,9 +24,9 @@ namespace ui
         widget.set_parent(this);
     }
 
-    void Button::set_action(void (*action)(void))
+    void Button::set_action(Action&& action)
     {
-        m_action = action;
+        m_action = move(action);
     }
 
     Result<EventResult> Button::handle_mouse_move(Point position)

libui/src/Layout.cpp

@@ -12,8 +12,8 @@
 
 namespace ui
 {
-    HorizontalLayout::HorizontalLayout(AdjustHeight adjust_height, AdjustWidth adjust_width)
-        : m_adjust_height(adjust_height), m_adjust_width(adjust_width)
+    HorizontalLayout::HorizontalLayout(Margins margins, AdjustHeight adjust_height, AdjustWidth adjust_width)
+        : m_margins(margins), m_adjust_height(adjust_height), m_adjust_width(adjust_width)
     {
     }
 
@@ -95,8 +95,8 @@ namespace ui
 
         if (m_adjust_width == AdjustWidth::No)
         {
-            widget.rect().pos.x = m_rect.pos.x + m_used_width;
-            m_used_width += widget.rect().width;
+            widget.rect().pos.x = m_rect.pos.x + m_used_width + m_margins.left;
+            m_used_width += m_margins.left + widget.rect().width + m_margins.right;
         }
         else
         {
@@ -104,24 +104,27 @@ namespace ui
             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;
+                w->rect().pos.x = m_rect.pos.x + used_width + m_margins.left;
+                w->rect().width = result.quot - (m_margins.left + m_margins.right);
                 used_width += result.quot;
             }
             m_widgets[m_widgets.size() - 1]->rect().width += result.rem;
         }
 
-        widget.rect().pos.y = m_rect.pos.y;
+        widget.rect().pos.y = m_rect.pos.y + m_margins.top;
 
-        if (m_adjust_height == AdjustHeight::Yes) { widget.rect().height = m_rect.height; }
+        if (m_adjust_height == AdjustHeight::Yes)
+        {
+            widget.rect().height = m_rect.height - (m_margins.top + m_margins.bottom);
+        }
 
         widget.set_parent(this);
 
         return {};
     }
 
-    VerticalLayout::VerticalLayout(AdjustHeight adjust_height, AdjustWidth adjust_width)
-        : m_adjust_height(adjust_height), m_adjust_width(adjust_width)
+    VerticalLayout::VerticalLayout(Margins margins, AdjustHeight adjust_height, AdjustWidth adjust_width)
+        : m_margins(margins), m_adjust_height(adjust_height), m_adjust_width(adjust_width)
     {
     }
 
@@ -203,8 +206,8 @@ namespace ui
 
         if (m_adjust_height == AdjustHeight::No)
         {
-            widget.rect().pos.y = m_rect.pos.y + m_used_height;
-            m_used_height += widget.rect().height;
+            widget.rect().pos.y = m_rect.pos.y + m_used_height + m_margins.top;
+            m_used_height += m_margins.top + widget.rect().height + m_margins.bottom;
         }
         else
         {
@@ -212,16 +215,19 @@ namespace ui
             div_t result = div(m_rect.height, (int)m_widgets.size());
             for (auto w : m_widgets)
             {
-                w->rect().pos.y = m_rect.pos.y + used_height;
-                w->rect().height = result.quot;
+                w->rect().pos.y = m_rect.pos.y + used_height + m_margins.top;
+                w->rect().height = result.quot - (m_margins.top + m_margins.bottom);
                 used_height += result.quot;
             }
             m_widgets[m_widgets.size() - 1]->rect().height += result.rem;
         }
 
-        widget.rect().pos.x = m_rect.pos.x;
+        widget.rect().pos.x = m_rect.pos.x + m_margins.left;
 
-        if (m_adjust_width == AdjustWidth::Yes) { widget.rect().width = m_rect.width; }
+        if (m_adjust_width == AdjustWidth::Yes)
+        {
+            widget.rect().width = m_rect.width - (m_margins.left + m_margins.right);
+        }
 
         widget.set_parent(this);