From b8fb2d47e3db50881e40eca105c799f1d5e3a040 Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Wed, 3 Mar 2021 10:59:50 +0300
Subject: [PATCH] UI window wip

---
 examples/ui.cpp                               |  25 ++-
 .../psemek/ui/default_element_factory.hpp     |   2 +
 libs/ui/include/psemek/ui/window.hpp          |  15 ++
 libs/ui/source/default_element_factory.cpp    | 171 +++++++++++++++++-
 4 files changed, 199 insertions(+), 14 deletions(-)
 create mode 100644 libs/ui/include/psemek/ui/window.hpp

diff --git a/examples/ui.cpp b/examples/ui.cpp
index 43cb37db..ec82b4da 100644
--- a/examples/ui.cpp
+++ b/examples/ui.cpp
@@ -46,21 +46,20 @@ struct ui_example
 		auto screen = element_factory.make_screen();
 		screen->set_style(style);
 
-		std::shared_ptr<ui::button> button;
+		auto window = element_factory.make_window("Settings");
+		auto frame = element_factory.make_frame();
 		{
-			gfx::pixmap_rgba pm({32, 32});
-			for (int x = 0; x < pm.width(); ++x)
-			{
-				for (int y = 0; y < pm.height(); ++y)
-				{
-					pm(x, y) = {(x * 255) / pm.width(), (y * 255) / pm.height(), 0, 255};
-				}
-			}
-			auto tex = std::make_shared<gfx::texture_2d>(gfx::texture_2d::from_pixmap(pm));
-			tex->nearest_filter();
-			button = element_factory.make_button(tex);
+			auto style = std::make_shared<ui::style>();
+			style->border_width = 0;
+			style->shadow_offset = {0, 0};
+			frame->set_style(style);
 		}
-		screen->add_child(button, ui::screen::x_policy::center, ui::screen::y_policy::center);
+		auto label = element_factory.make_label(to_be);
+		label->set_overflow(ui::label::overflow_mode::ellipsis);
+		label->set_multiline(ui::label::multiline_mode::minimize_lines);
+		frame->set_child(label);
+		window->set_child(frame);
+		screen->add_child(window, ui::screen::x_policy::center, ui::screen::y_policy::center);
 
 		ui_controller.set_root(std::move(screen));
 	}
diff --git a/libs/ui/include/psemek/ui/default_element_factory.hpp b/libs/ui/include/psemek/ui/default_element_factory.hpp
index fdeeff37..81952ffc 100644
--- a/libs/ui/include/psemek/ui/default_element_factory.hpp
+++ b/libs/ui/include/psemek/ui/default_element_factory.hpp
@@ -4,6 +4,7 @@
 #include <psemek/ui/button.hpp>
 #include <psemek/ui/label.hpp>
 #include <psemek/ui/frame.hpp>
+#include <psemek/ui/window.hpp>
 #include <psemek/ui/screen.hpp>
 #include <psemek/ui/grid_layout.hpp>
 
@@ -23,6 +24,7 @@ namespace psemek::ui
 		std::shared_ptr<button> make_button(std::shared_ptr<gfx::texture_2d> icon);
 		std::shared_ptr<label> make_label(std::string text);
 		std::shared_ptr<frame> make_frame();
+		std::shared_ptr<window> make_window(std::string caption);
 		std::shared_ptr<screen> make_screen();
 		std::shared_ptr<grid_layout> make_grid_layout();
 
diff --git a/libs/ui/include/psemek/ui/window.hpp b/libs/ui/include/psemek/ui/window.hpp
new file mode 100644
index 00000000..2e651acd
--- /dev/null
+++ b/libs/ui/include/psemek/ui/window.hpp
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <psemek/ui/element.hpp>
+
+namespace psemek::ui
+{
+
+	struct window
+		: element
+	{
+		virtual void set_caption(std::string caption) = 0;
+		virtual std::shared_ptr<element> set_child(std::shared_ptr<element> c) = 0;
+	};
+
+}
diff --git a/libs/ui/source/default_element_factory.cpp b/libs/ui/source/default_element_factory.cpp
index e8063623..9985f4e6 100644
--- a/libs/ui/source/default_element_factory.cpp
+++ b/libs/ui/source/default_element_factory.cpp
@@ -1,6 +1,10 @@
 #include <psemek/ui/default_element_factory.hpp>
 
 #include <psemek/ui/box_shape.hpp>
+#include <psemek/util/memory_stream.hpp>
+
+#include <psemek/ui/resources/cross_red_16x16_png.hpp>
+
 
 namespace psemek::ui
 {
@@ -169,10 +173,167 @@ namespace psemek::ui
 			box_shape shape_;
 		};
 
+		struct window_impl
+			: window
+		{
+			window_impl(std::shared_ptr<gfx::texture_2d> close_icon)
+				: caption_(std::make_shared<label>())
+				, close_button_(std::make_shared<button_impl>(close_icon))
+			{
+				caption_->set_parent(this);
+				close_button_->set_parent(this);
+
+				caption_->set_valign(label::valignment::center);
+				caption_->set_overflow(label::overflow_mode::ellipsis);
+
+				auto close_button_style = std::make_shared<struct style>();
+				close_button_style->shadow_offset = {0, 0};
+				close_button_->set_style(close_button_style);
+
+				children_[0] = caption_.get();
+				children_[1] = close_button_.get();
+				children_[2] = nullptr;
+			}
+
+			void setup_close()
+			{
+				auto weak_self = weak_from_this();
+				close_button_->on_click([weak_self]{
+					if (auto self = weak_self.lock())
+					{
+						if (auto p = dynamic_cast<container *>(self->parent()))
+							p->remove_child(self.get());
+						else
+							throw std::runtime_error("Cannot remove window from non-container parent");
+					}
+				});
+			}
+
+			void set_caption(std::string caption) override
+			{
+				caption_->set_text(caption);
+			}
+
+			std::shared_ptr<element> set_child(std::shared_ptr<element> c) override
+			{
+				if (child_) child_->set_parent(nullptr);
+				std::swap(child_, c);
+				if (child_) child_->set_parent(this);
+				children_[2] = child_.get();
+				return c;
+			}
+
+			children_range children() const override
+			{
+				return children_range{children_};
+			}
+
+			struct shape const & shape() const override
+			{
+				return shape_;
+			}
+
+			void reshape(geom::box<float, 2> const & bbox) override
+			{
+				shape_.box = bbox;
+
+				auto lc = caption_->size_constraints();
+				auto bc = close_button_->size_constraints();
+
+				auto st = merged_style();
+
+				float const header_height = std::max(lc[1].min + 2.f * (*st->border_width), bc[1].min);
+
+				{
+					geom::box<float, 2> b;
+					b[0].min = bbox[0].max - bc[0].min;
+					b[0].max = bbox[0].max;
+					b[1].min = bbox[1].min;
+					b[1].max = bbox[1].min + header_height;
+					close_button_->reshape(b);
+				}
+
+				{
+					geom::box<float, 2> b;
+					b[0].min = bbox[0].min + (*st->border_width);
+					b[0].max = bbox[0].max - bc[0].min;
+					b[1].min = bbox[1].min + (*st->border_width);
+					b[1].max = bbox[1].min + header_height - (*st->border_width);
+					caption_->reshape(b);
+				}
+
+				if (child_)
+				{
+					geom::box<float, 2> b;
+					b[0].min = bbox[0].min + (*st->border_width);
+					b[0].max = bbox[0].max - (*st->border_width);
+					b[1].min = bbox[1].min + header_height;
+					b[1].max = bbox[1].max - (*st->border_width);
+					child_->reshape(b);
+				}
+			}
+
+			geom::box<float, 2> size_constraints() const override
+			{
+				geom::box<float, 2> r = element::size_constraints();
+				if (child_) r = child_->size_constraints();
+
+				auto lc = caption_->size_constraints();
+				auto bc = close_button_->size_constraints();
+
+				auto st = merged_style();
+
+				float const header_height = std::max(lc[1].min + 2.f * (*st->border_width), bc[1].min);
+
+				r[0].min = std::max(r[0].min + 2.f * (*st->border_width), (*st->border_width) + lc[0].min + bc[0].min);
+				r[1] += (*st->border_width) * 1.f + header_height;
+
+				return r;
+			}
+
+			void draw(painter & p) const override
+			{
+				auto st = merged_style();
+
+				auto lc = caption_->size_constraints();
+				auto bc = close_button_->size_constraints();
+
+				auto const & bb = shape_.box;
+
+				if (*st->shadow_offset != geom::vector{0, 0})
+					p.draw_rect(bb + geom::cast<float>(*st->shadow_offset), *st->shadow_color);
+				p.draw_rect(bb, *st->border_color);
+
+				float const header_height = std::max(lc[1].min + 2.f * (*st->border_width), bc[1].min);
+				p.draw_rect({{{bb[0].min + (*st->border_width), bb[0].max - bc[0].min}, {bb[1].min + (*st->border_width), bb[1].min + header_height - (*st->border_width)}}},
+					*st->fg_color);
+			}
+
+		private:
+			std::shared_ptr<label> caption_;
+			std::shared_ptr<button> close_button_;
+			std::shared_ptr<element> child_;
+
+			box_shape shape_;
+
+			element * children_[3];
+		};
+
 	}
 
 	struct default_element_factory::impl
-	{};
+	{
+		std::shared_ptr<gfx::texture_2d> cross_red_16x16;
+
+		impl();
+	};
+
+	default_element_factory::impl::impl()
+	{
+		util::memory_istream is{resources::cross_red_16x16_png};
+		cross_red_16x16 = std::make_shared<gfx::texture_2d>(gfx::texture_2d::from_pixmap(gfx::read_png(is)));
+		cross_red_16x16->nearest_filter();
+	}
 
 	default_element_factory::default_element_factory()
 		: pimpl_{make_impl()}
@@ -202,6 +363,14 @@ namespace psemek::ui
 		return std::make_shared<frame_impl>();
 	}
 
+	std::shared_ptr<window> default_element_factory::make_window(std::string caption)
+	{
+		auto r = std::make_shared<window_impl>(impl().cross_red_16x16);
+		r->setup_close();
+		r->set_caption(std::move(caption));
+		return r;
+	}
+
 	std::shared_ptr<screen> default_element_factory::make_screen()
 	{
 		return std::make_shared<screen>();