1 files changed, 88 insertions, 0 deletions
diff --git a/source/logview.h b/source/logview.h
new file mode 100644
index 0000000..cfe5011
--- /dev/null
+++ b/source/logview.h
@@ -0,0 +1,88 @@
+#ifndef LOGVIEW_H
+#define LOGVIEW_H
+
+#include <string>
+
+// Adapted from ExampleAppLog from imgui_demo.cpp
+class LogView
+{
+public:
+    LogView()
+    {
+        Clear();
+    }
+
+    void Clear()
+    {
+        Buf.clear();
+        LineOffsets.clear();
+        LineOffsets.push_back(0);
+    }
+
+    void AddLog(const std::string& str)
+    {
+        AddLog(str.c_str());
+    }
+
+    void AddLog(const char* fmt, ...) IM_FMTARGS(2)
+    {
+        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);
+    }
+
+    void Draw(const char* title, bool* p_open = NULL, ImGuiWindowFlags flags = 0)
+    {
+        if (!ImGui::Begin(title, p_open, flags))
+        {
+            ImGui::End();
+            return;
+        }
+
+        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 (ImGui::GetScrollY() >= ImGui::GetScrollMaxY())
+            ImGui::SetScrollHereY(1.0f);
+
+        ImGui::EndChild();
+        ImGui::End();
+    }
+
+private:
+    ImGuiTextBuffer Buf;
+    ImVector<int> LineOffsets; // Index to lines offset. We maintain this with AddLog() calls.
+};
+
+#endif // LOGVIEW_H
+