feat: selectbox options context menu

src/graphics/ui/elements/SelectBox.cpp

@@ -1,6 +1,11 @@
 #include "SelectBox.hpp"
 
 #include "Label.hpp"
+#include "assets/Assets.hpp"
+#include "graphics/ui/GUI.hpp"
+#include "graphics/ui/elements/Panel.hpp"
+#include "graphics/core/Batch2D.hpp"
+#include "graphics/core/DrawContext.hpp"
 
 using namespace gui;
 
@@ -13,4 +18,43 @@ SelectBox::SelectBox(
 )
     : Button(gui, selected.text, padding, nullptr, glm::vec2(contentWidth, -1)),
       elements(std::move(elements)) {
+
+    listenAction([this](GUI& gui) {
+        auto panel = std::make_shared<Panel>(gui, getSize());
+        panel->setPos(calcPos() + glm::vec2(0, size.y));
+        for (const auto& option : this->elements) {
+            auto button = std::make_shared<Button>(
+                gui, option.text, glm::vec4(10.0f), nullptr, glm::vec2(-1.0f)
+            );
+            button->listenFocus([this, option](GUI&) {
+                setSelected(option);
+            });
+            panel->add(button);
+        }
+        panel->setZIndex(999);
+        gui.setFocus(panel);
+        panel->listenDefocus([panel=panel.get()](GUI& gui) {
+            gui.remove(panel);
+        });
+        gui.add(panel);
+    });
+}
+
+void SelectBox::setSelected(const Element& selected) {
+    this->selected = selected;
+    this->label->setText(selected.text);
+}
+
+void SelectBox::drawBackground(const DrawContext& pctx, const Assets&) {
+    glm::vec2 pos = calcPos();
+    auto batch = pctx.getBatch2D();
+    batch->texture(nullptr);
+    batch->setColor(calcColor());
+    batch->rect(pos.x, pos.y, size.x, size.y);
+    batch->setColor({1.0f, 1.0f, 1.0f, 0.333f});
+    batch->triangle(
+        pos.x + size.x - 32, pos.y + size.y / 2.0f - 4,
+        pos.x + size.x - 32 + 16, pos.y + size.y / 2.0f - 4,
+        pos.x + size.x - 32 + 8, pos.y + size.y / 2.0f + 4
+    );
 }