feat: selectbox options context menu

src/graphics/core/Batch2D.cpp

@@ -333,6 +333,15 @@ void Batch2D::rect(
     vertex(v1, glm::vec2(0, 0), r2,g2,b2,1.0f);
 }
 
+void Batch2D::triangle(float x1, float y1, float x2, float y2, float x3, float y3) {
+    if (index + 3 >= capacity) {
+        flush();
+    }
+    vertex({x1, y1}, {x1, y1}, color.r, color.g, color.b, color.a);
+    vertex({x2, y2}, {x2, y2}, color.r, color.g, color.b, color.a);
+    vertex({x3, y3}, {x3, y3}, color.r, color.g, color.b, color.a);
+}
+
 void Batch2D::sprite(float x, float y, float w, float h, const UVRegion& region, glm::vec4 tint){
     rect(x, y, w, h, region.u1, region.v1, region.u2-region.u1, region.v2-region.v1, tint.r, tint.g, tint.b, tint.a);
 }

src/graphics/core/Batch2D.hpp

@@ -117,6 +117,8 @@ public:
         float r4, float g4, float b4, int sh
     );
 
+    void triangle(float x1, float y1, float x2, float y2, float x3, float y3);
+
     void flush() override;
 
     void lineWidth(float width);

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
+    );
 }

src/graphics/ui/elements/SelectBox.hpp

@@ -22,5 +22,9 @@ namespace gui {
             int contentWidth,
             const glm::vec4& padding
         );
+
+        void setSelected(const Element& selected);
+
+        void drawBackground(const DrawContext& pctx, const Assets&) override;
     };
 }