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Demo: Log: Comments. Using clipper. Not linking with rand() anymore.

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This commit is contained in:
omar 2019-01-07 17:33:02 +01:00
parent acfa4050ec
commit 50faccf764
2 changed files with 56 additions and 20 deletions
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1
docs/TODO.txt
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@ -31,6 +31,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
- window: freeze window flag: if not focused/hovered, return false, render with previous ImDrawList. and/or reduce refresh rate.
- window: investigate better auto-positioning for new windows.
- window/child: the first draw command of a child window could be moved into the current draw command of the parent window (unless child+tooltip?).
- scrolling: while holding down a scrollbar, try to keep the same contents visible (at least while not moving mouse)
- scrolling: allow immediately effective change of scroll after Begin() if we haven't appended items yet.
- scrolling/clipping: separator on the initial position of a window is not visible (cursorpos.y <= clippos.y). (2017-08-20: can't repro)
- scrolling/style: shadows on scrollable areas to denote that there is more contents

75
imgui_demo.cpp
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@ -3375,10 +3375,15 @@ struct ExampleAppLog
{
ImGuiTextBuffer Buf;
ImGuiTextFilter Filter;
ImVector<int> LineOffsets; // Index to lines offset
ImVector<int> LineOffsets; // Index to lines offset. We maintain this with AddLog() calls, allowing us to have a random access on lines
bool ScrollToBottom;
void Clear() { Buf.clear(); LineOffsets.clear(); }
void Clear()
{
Buf.clear();
LineOffsets.clear();
LineOffsets.push_back(0);
}
void AddLog(const char* fmt, ...) IM_FMTARGS(2)
{
@ -3389,13 +3394,12 @@ struct ExampleAppLog
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);
LineOffsets.push_back(old_size + 1);
ScrollToBottom = true;
}
void Draw(const char* title, bool* p_open = NULL)
{
ImGui::SetNextWindowSize(ImVec2(500,400), ImGuiCond_FirstUseEver);
if (!ImGui::Begin(title, p_open))
{
ImGui::End();
@ -3408,24 +3412,47 @@ struct ExampleAppLog
Filter.Draw("Filter", -100.0f);
ImGui::Separator();
ImGui::BeginChild("scrolling", ImVec2(0,0), false, ImGuiWindowFlags_HorizontalScrollbar);
if (copy) ImGui::LogToClipboard();
if (copy)
ImGui::LogToClipboard();
ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0));
const char* buf = Buf.begin();
const char* buf_end = Buf.end();
if (Filter.IsActive())
{
const char* buf_begin = Buf.begin();
const char* line = buf_begin;
for (int line_no = 0; line != NULL; line_no++)
for (int line_no = 0; line_no < LineOffsets.Size; line_no++)
{
const char* line_end = (line_no < LineOffsets.Size) ? buf_begin + LineOffsets[line_no] : NULL;
if (Filter.PassFilter(line, line_end))
ImGui::TextUnformatted(line, line_end);
line = line_end && line_end[1] ? line_end + 1 : NULL;
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;
if (Filter.PassFilter(line_start, line_end))
ImGui::TextUnformatted(line_start, line_end);
}
}
else
{
ImGui::TextUnformatted(Buf.begin());
// The simplest and easy way to display the entire buffer:
// ImGui::TextUnformatted(buf_begin, buf_end);
// And it'll just work. TextUnformatted() has specialization for large blob of text and will fast-forward to skip non-visible lines.
// Here we instead demonstrate using the clipper to only process lines that are within the visible area.
// If you have tens of thousands of items and their processing cost is non-negligible, coarse clipping them on your side is recommended.
// Using ImGuiListClipper requires A) random access into your data, and B) items all being the same height,
// both of which we can handle since we an array pointing to the beginning of each line of text.
// When using the filter (in the block of code above) we don't have random access into the data to display anymore, which is why we don't use the clipper.
// Storing or skimming through the search result would make it possible (and would be recommended if you want to search through tens of thousands of entries)
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 (ScrollToBottom)
ImGui::SetScrollHereY(1.0f);
@ -3440,15 +3467,23 @@ static void ShowExampleAppLog(bool* p_open)
{
static ExampleAppLog log;
// Demo: add random items (unless Ctrl is held)
static double last_time = -1.0;
double time = ImGui::GetTime();
if (time - last_time >= 0.20f && !ImGui::GetIO().KeyCtrl)
// For the demo: add a debug button before the normal log window contents
// We take advantage of the fact that multiple calls to Begin()/End() are appending to the same window.
ImGui::SetNextWindowSize(ImVec2(500, 400), ImGuiCond_FirstUseEver);
ImGui::Begin("Example: Log", p_open);
if (ImGui::SmallButton("Add 5 entries"))
{
const char* random_words[] = { "system", "info", "warning", "error", "fatal", "notice", "log" };
log.AddLog("[%s] Hello, time is %.1f, frame count is %d\n", random_words[rand() % IM_ARRAYSIZE(random_words)], time, ImGui::GetFrameCount());
last_time = time;
static int counter = 0;
for (int n = 0; n < 5; n++)
{
const char* categories[3] = { "info", "warn", "error" };
const char* words[] = { "Bumfuzzled", "Cattywampus", "Snickersnee", "Abibliophobia", "Absquatulate", "Nincompoop", "Pauciloquent" };
log.AddLog("[%05d] [%s] Hello, current time is %.1f, here's a word: '%s'\n",
ImGui::GetFrameCount(), categories[counter % IM_ARRAYSIZE(categories)], ImGui::GetTime(), words[counter % IM_ARRAYSIZE(words)]);
counter++;
}
}
ImGui::End();
log.Draw("Example: Log", p_open);
}