public release

sphaira/source/ui/scrollbar.cpp

@@ -0,0 +1,68 @@
+#include "ui/scrollbar.hpp"
+#include "ui/nvg_util.hpp"
+
+namespace sphaira::ui {
+
+ScrollBar::ScrollBar(Vec4 bounds, float entry_height, std::size_t entries)
+    : m_bounds{bounds}
+    , m_entries{entries}
+    , m_entry_height{entry_height} {
+    Setup();
+}
+
+auto ScrollBar::OnLayoutChange() -> void {
+
+}
+
+auto ScrollBar::Draw(NVGcontext* vg, Theme* theme) -> void {
+    if (m_should_draw) {
+        gfx::drawRect(vg, m_pos, gfx::Colour::RED);
+    }
+}
+
+auto ScrollBar::Setup(Vec4 bounds, float entry_height, std::size_t entries) -> void {
+    m_bounds = bounds;
+    m_entry_height = entry_height;
+    m_entries = entries;
+    Setup();
+}
+
+auto ScrollBar::Setup() -> void {
+    m_bounds.y += 5.f;
+    m_bounds.h -= 10.f;
+
+    const float total_size = (m_entry_height) * static_cast<float>(m_entries);
+    if (total_size > m_bounds.h) {
+        m_step_size = total_size / m_entries;
+        m_pos.x = m_bounds.x;
+        m_pos.y = m_bounds.y;
+        m_pos.w = 2.f;
+        m_pos.h = total_size - m_bounds.h;
+        m_should_draw = true;
+        // LOG("total size: %.2f\n", total_size);
+        // LOG("step size: %.2f\n", m_step_size);
+        // LOG("pos y: %.2f\n", m_pos.y);
+        // LOG("pos h: %.2f\n", m_pos.h);
+    } else {
+        // LOG("not big enough for scroll total: %.2f bounds: %.2f\n", total_size, bounds.h);
+    }
+}
+
+auto ScrollBar::Move(Direction direction) -> void {
+    switch (direction) {
+        case Direction::DOWN:
+            if (m_index < (m_entries - 1)) {
+                m_index++;
+                m_pos.y += m_step_size;
+            }
+            break;
+        case Direction::UP:
+            if (m_index != 0) {
+                m_index--;
+                m_pos.y -= m_step_size;
+            }
+            break;
+    }
+}
+
+} // namespace sphaira::ui