1 files changed, 82 insertions, 0 deletions
diff --git a/source/logview.cpp b/source/logview.cpp
new file mode 100644
index 0000000..5a771bf
--- /dev/null
+++ b/source/logview.cpp
@@ -0,0 +1,82 @@
+#include "logview.h"
+
+LogView::LogView()
+{
+    Clear();
+}
+
+void LogView::Clear()
+{
+    Buf.clear();
+    LineOffsets.clear();
+    LineOffsets.push_back(0);
+    updated = false;
+}
+
+void LogView::AddLog(const std::string& str)
+{
+    AddLog(str.c_str());
+}
+
+void LogView::AddLog(const char* fmt, ...)
+{
+    int old_size = Buf.size();
+    va_list args;
+    va_start(args, fmt);
+    Buf.appendfv(fmt, args);
+    Buf.appendfv("\n", args);
+    va_end(args);
+    for (int new_size = Buf.size(); old_size < new_size; old_size++)
+        if (Buf[old_size] == '\n')
+            LineOffsets.push_back(old_size + 1);
+    updated = true;
+}
+
+void LogView::Draw(const char* title, bool* p_open, ImGuiWindowFlags flags)
+{
+    if (!ImGui::Begin(title, p_open, flags))
+    {
+        ImGui::End();
+        return;
+    }
+
+    ImGui::Text("Log ");
+    ImGui::SameLine(ImGui::GetWindowWidth() - 120);
+    if (ImGui::Button("Clear"))
+        Clear();
+    ImGui::SameLine();
+    if (ImGui::Button("Copy"))
+        ImGui::LogToClipboard();
+    ImGui::Separator();
+    ImGui::BeginChild("scrolling", ImVec2(0, 0), false, ImGuiWindowFlags_HorizontalScrollbar);
+
+
+    ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0));
+    const char* buf = Buf.begin();
+    const char* buf_end = Buf.end();
+
+    ImGuiListClipper clipper;
+    clipper.Begin(LineOffsets.Size);
+
+    while (clipper.Step())
+    {
+        for (int line_no = clipper.DisplayStart; line_no < clipper.DisplayEnd; line_no++)
+        {
+            const char* line_start = buf + LineOffsets[line_no];
+            const char* line_end = (line_no + 1 < LineOffsets.Size) ? (buf + LineOffsets[line_no + 1] - 1) : buf_end;
+            ImGui::TextUnformatted(line_start, line_end);
+        }
+    }
+    clipper.End();
+
+    ImGui::PopStyleVar();
+
+    if (updated) {
+        ImGui::SetScrollHereY();
+        updated = false;
+    }
+
+    ImGui::EndChild();
+    ImGui::End();
+}
+