LibGUI: Implement basic message box

userspace/libraries/LibGUI/CMakeLists.txt

@@ -1,4 +1,5 @@
 set(LIBGUI_SOURCES
+	MessageBox.cpp
 	Texture.cpp
 	Widget/Button.cpp
 	Widget/Grid.cpp

userspace/libraries/LibGUI/MessageBox.cpp

@@ -0,0 +1,67 @@
+#include <LibGUI/MessageBox.h>
+#include <LibGUI/Window.h>
+#include <LibGUI/Widget/Button.h>
+#include <LibGUI/Widget/Grid.h>
+#include <LibGUI/Widget/TextArea.h>
+#include <LibGUI/Widget/Widget.h>
+
+namespace LibGUI
+{
+
+	BAN::ErrorOr<void> MessageBox::create(BAN::StringView message, BAN::StringView title)
+	{
+		BAN::StringView ok_button = "OK";
+		TRY(create(message, title, { &ok_button, 1 }));
+		return {};
+	}
+
+	BAN::ErrorOr<size_t> MessageBox::create(BAN::StringView message, BAN::StringView title, BAN::Span<BAN::StringView> buttons)
+	{
+		if (buttons.empty())
+			return BAN::Error::from_errno(EINVAL);
+
+		const uint32_t window_width = 300;
+
+		auto root_widget = TRY(Widget::Widget::create({}, 0xFFFFFF, { 0, 0, window_width, 0 }));
+
+		auto text_area = TRY(Widget::TextArea::create(root_widget, message, { 0, 0, window_width, 0}));
+		text_area->style().border_width = 0;
+		text_area->style().color_normal = Widget::Widget::color_invisible;
+		text_area->style().corner_radius = 0;
+		TRY(text_area->set_relative_geometry({ 0.0, 0.0, 1.0, 0.8 }));
+		text_area->show();
+
+		bool waiting = true;
+		size_t result = 0;
+
+		auto button_area = TRY(Widget::Grid::create(root_widget, buttons.size(), 1));
+		for (size_t i = 0; i < buttons.size(); i++)
+		{
+			auto button = TRY(Widget::Button::create(button_area, buttons[i]));
+			TRY(button_area->set_widget_position(button, i, 1, 0, 1));
+			button->set_click_callback([&result, &waiting, i] { result = i; waiting = false; });
+			button->show();
+		}
+		TRY(button_area->set_relative_geometry({ 0.0, 0.8, 1.0, 0.2 }));
+		button_area->show();
+
+		const uint32_t button_height = 20;
+		const uint32_t window_height = text_area->get_required_height() + button_height;
+
+		auto attributes = Window::default_attributes;
+		attributes.resizable = true;
+
+		auto window = TRY(Window::create(window_width, window_height, title, attributes));
+		TRY(window->set_root_widget(root_widget));
+		window->set_close_window_event_callback([&waiting] { waiting = false; });
+
+		while (waiting)
+		{
+			window->wait_events();
+			window->poll_events();
+		}
+
+		return result;
+	}
+
+}

userspace/libraries/LibGUI/include/LibGUI/MessageBox.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <BAN/Span.h>
+#include <BAN/StringView.h>
+
+#include <stddef.h>
+
+namespace LibGUI
+{
+
+	class MessageBox
+	{
+	public:
+		static BAN::ErrorOr<void> create(BAN::StringView message, BAN::StringView title);
+		static BAN::ErrorOr<size_t> create(BAN::StringView message, BAN::StringView title, BAN::Span<BAN::StringView> buttons);
+	};
+
+}