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#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;
}
ImGui::Text("Log ");
ImGui::SameLine();
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
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