1 files changed, 110 insertions, 0 deletions
diff --git a/src/game/client/progress_bar.cc b/src/game/client/progress_bar.cc
new file mode 100644
index 0000000..dfab705
--- /dev/null
+++ b/src/game/client/progress_bar.cc
@@ -0,0 +1,110 @@
+#include "client/pch.hh"
+
+#include "client/progress_bar.hh"
+
+#include "core/constexpr.hh"
+
+#include "client/globals.hh"
+#include "client/language.hh"
+
+constexpr static ImGuiWindowFlags WINDOW_FLAGS = ImGuiWindowFlags_NoBackground | ImGuiWindowFlags_NoDecoration;
+
+static std::string str_title;
+static std::string str_button;
+static progress_bar_action button_action;
+
+void progress_bar::init(void)
+{
+    str_title = "Loading";
+    str_button = std::string();
+    button_action = nullptr;
+}
+
+void progress_bar::layout(void)
+{
+    const auto viewport = ImGui::GetMainViewport();
+    const auto window_start = ImVec2(0.0f, viewport->Size.y * 0.30f);
+    const auto window_size = ImVec2(viewport->Size.x, viewport->Size.y * 0.70f);
+
+    ImGui::SetNextWindowPos(window_start);
+    ImGui::SetNextWindowSize(window_size);
+
+    if(ImGui::Begin("###UIProgress", nullptr, WINDOW_FLAGS)) {
+        ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, ImVec2(0.0f, 1.0f * globals::gui_scale));
+
+        const float title_width = ImGui::CalcTextSize(str_title.c_str()).x;
+        ImGui::SetCursorPosX(0.5f * (window_size.x - title_width));
+        ImGui::TextUnformatted(str_title.c_str());
+
+        ImGui::Dummy(ImVec2(0.0f, 8.0f * globals::gui_scale));
+
+        const ImVec2 cursor = ImGui::GetCursorPos();
+
+        const std::size_t num_bars = 32;
+        const float spinner_width = 0.8f * ImGui::CalcItemWidth();
+        const float bar_width = spinner_width / static_cast<float>(num_bars);
+        const float bar_height = 0.5f * ImGui::GetFrameHeight();
+
+        const float base_xpos = window_start.x + 0.5f * (window_size.x - spinner_width) + 0.5f;
+        const float base_ypos = window_start.y + cursor.y;
+        const float phase = 2.0f * ImGui::GetTime();
+
+        const ImVec4& background = ImGui::GetStyleColorVec4(ImGuiCol_Button);
+        const ImVec4& foreground = ImGui::GetStyleColorVec4(ImGuiCol_PlotHistogram);
+
+        for(std::size_t i = 0; i < num_bars; ++i) {
+            const float sinval = std::sin(M_PI * static_cast<float>(i) / static_cast<float>(num_bars) - phase);
+            const float modifier = std::exp(-8.0f * (0.5f + 0.5f * sinval));
+
+            ImVec4 color = {};
+            color.x = vx::lerp(background.x, foreground.x, modifier);
+            color.y = vx::lerp(background.y, foreground.y, modifier);
+            color.z = vx::lerp(background.z, foreground.z, modifier);
+            color.w = vx::lerp(background.w, foreground.w, modifier);
+
+            const ImVec2 start = ImVec2(base_xpos + bar_width * i, base_ypos);
+            const ImVec2 end = ImVec2(start.x + bar_width, start.y + bar_height);
+            ImGui::GetWindowDrawList()->AddRectFilled(start, end, ImGui::GetColorU32(color));
+        }
+
+        // The NewLine call tricks ImGui into correctly padding the
+        // next widget that comes after the progress_bar spinner; this
+        // is needed to ensure the button is located in the correct place
+        ImGui::NewLine();
+
+        if(!str_button.empty()) {
+            ImGui::Dummy(ImVec2(0.0f, 32.0f * globals::gui_scale));
+
+            const float button_width = 0.8f * ImGui::CalcItemWidth();
+            ImGui::SetCursorPosX(0.5f * (window_size.x - button_width));
+
+            if(ImGui::Button(str_button.c_str(), ImVec2(button_width, 0.0f))) {
+                if(button_action) {
+                    button_action();
+                }
+            }
+        }
+
+        ImGui::PopStyleVar();
+    }
+
+    ImGui::End();
+}
+
+void progress_bar::reset(void)
+{
+    str_title.clear();
+    str_button.clear();
+    button_action = nullptr;
+}
+
+void progress_bar::set_title(const char* title)
+{
+    str_title = language::resolve(title);
+}
+
+void progress_bar::set_button(const char* text, const progress_bar_action& action)
+{
+    str_button = std::format("{}###ProgressBar_Button", language::resolve(text));
+    button_action = action;
+}