+#include "Label.hpp"
+#include "Panel.hpp"
+#include "Widget.hpp"
+
+#include "../app/Assets.hpp"
+#include "../graphics/Font.hpp"
+#include "../graphics/Viewport.hpp"
+
+#include <glm/gtx/transform.hpp>
+
+
+namespace blobs {
+namespace ui {
+
+Label::Label(const graphics::Font &f)
+: font(&f)
+, text()
+, tex()
+, fg_color(0.0f, 0.0f, 0.0f, 1.0f)
+, bg_color(0.0f, 0.0f, 0.0f, 0.0f)
+, dirty(true) {
+}
+
+Label::~Label() {
+}
+
+Label &Label::Text(const std::string &t) {
+ if (text != t) {
+ dirty = true;
+ }
+ text = t;
+ return *this;
+}
+
+Label &Label::Font(const graphics::Font &f) {
+ if (font != &f) {
+ dirty = true;
+ }
+ font = &f;
+ return *this;
+}
+
+Label &Label::Foreground(const glm::vec4 &c) {
+ fg_color = c;
+ return *this;
+}
+
+Label &Label::Background(const glm::vec4 &c) {
+ bg_color = c;
+ return *this;
+}
+
+glm::vec2 Label::Size() {
+ if (text.empty()) {
+ return glm::vec2(0.0f);
+ }
+ Update();
+ return tex.Size();
+}
+
+void Label::Draw(app::Assets &assets, graphics::Viewport &viewport) noexcept {
+ Update();
+ glm::vec2 size = Size();
+
+ assets.shaders.alpha_sprite.Activate();
+ assets.shaders.alpha_sprite.SetM(glm::translate(AlignedPosition())
+ * glm::scale(glm::vec3(size.x, size.y, 1.0f)));
+ assets.shaders.alpha_sprite.SetTexture(tex);
+ assets.shaders.alpha_sprite.SetFgColor(fg_color);
+ assets.shaders.alpha_sprite.SetBgColor(bg_color);
+ assets.shaders.alpha_sprite.DrawRect();
+}
+
+void Label::Update() {
+ if (!dirty) return;
+ font->Render(text, tex);
+ dirty = false;
+}
+
+
+Panel::Panel()
+: widgets()
+, bg_color(0.0f, 0.0f, 0.0f, 0.0f)
+, padding(0.0f)
+, spacing(0.0f)
+, dir(VERTICAL)
+, size(0.0f, 0.0f) {
+}
+
+Panel::~Panel() {
+}
+
+Panel &Panel::Add(Widget *w) {
+ std::unique_ptr<Widget> widget(w);
+ glm::vec2 wsize = widget->Size();
+ if (dir == HORIZONTAL) {
+ size.x += wsize.x;
+ size.y = std::max(size.y, wsize.y);
+ } else {
+ size.x = std::max(size.x, wsize.x);
+ size.y += wsize.y;
+ }
+ widgets.emplace_back(std::move(widget));
+ return *this;
+}
+
+Panel &Panel::Background(const glm::vec4 &c) {
+ bg_color = c;
+ return *this;
+}
+
+Panel &Panel::Padding(const glm::vec2 &p) {
+ padding = p;
+ return *this;
+}
+
+Panel &Panel::Spacing(float s) {
+ spacing = s;
+ return *this;
+}
+
+Panel &Panel::Direction(Dir d) {
+ dir = d;
+ Relayout();
+ return *this;
+}
+
+glm::vec2 Panel::Size() {
+ return 2.0f * padding + glm::vec2(0.0f, (widgets.size() - 1) * spacing) + size;
+}
+
+void Panel::Relayout() {
+ size = glm::vec2(0.0f);
+ if (dir == HORIZONTAL) {
+ for (auto &w : widgets) {
+ glm::vec2 wsize = w->Size();
+ size.x += wsize.x;
+ size.y = std::max(size.y, wsize.y);
+ }
+ } else {
+ for (auto &w : widgets) {
+ glm::vec2 wsize = w->Size();
+ size.x = std::max(size.x, wsize.x);
+ size.y += wsize.y;
+ }
+ }
+}
+
+void Panel::Draw(app::Assets &assets, graphics::Viewport &viewport) noexcept {
+ if (bg_color.a > 0.0f) {
+ glm::vec2 fullsize = Size();
+ assets.shaders.plain_color.Activate();
+ assets.shaders.plain_color.SetM(glm::translate(AlignedPosition())
+ * glm::scale(glm::vec3(fullsize.x, fullsize.y, 1.0f)));
+ assets.shaders.plain_color.SetColor(bg_color);
+ assets.shaders.plain_color.DrawRect();
+ }
+
+ glm::vec3 cursor = TopLeft();
+ cursor.x += padding.x;
+ cursor.y += padding.y;
+ cursor.z -= 1.0f;
+ for (auto &w : widgets) {
+ w->Position(cursor).Origin(Gravity::NORTH_WEST);
+ w->Draw(assets, viewport);
+ cursor[dir] += w->Size()[dir] + spacing;
+ }
+}
+
+
+Widget::Widget()
+: pos(0.0f)
+, origin(Gravity::CENTER) {
+}
+
+Widget::~Widget() {
+}
+
+glm::vec3 Widget::AlignedPosition() noexcept {
+ return align(origin, Size(), pos);
+}
+
+glm::vec3 Widget::TopLeft() noexcept {
+ glm::vec2 size = Size();
+ return align(origin, size, pos) - glm::vec3(size * 0.5f, 0.0f);
+}
+
+}
+}