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ShowExampleAppLongText() demonstrate manual clipping.

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ocornut 2015-02-08 14:32:58 +00:00
parent d5d8dedadd
commit 9596a2b4f1
1 changed files with 27 additions and 2 deletions
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29
imgui.cpp
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@ -8749,9 +8749,11 @@ static void ShowExampleAppLongText(bool* opened)
return; return;
} }
static int test_type = 0;
static ImGuiTextBuffer log; static ImGuiTextBuffer log;
static int lines = 0; static int lines = 0;
ImGui::Text("Printing unusually long amount of text."); ImGui::Text("Printing unusually long amount of text.");
ImGui::Combo("Test type", &test_type, "Single call to TextUnformatted()\0Individual calls to Text(), clipped manually\0Individual calls to Text(), not clipped");
ImGui::Text("Buffer contents: %d lines, %d bytes", lines, log.size()); ImGui::Text("Buffer contents: %d lines, %d bytes", lines, log.size());
if (ImGui::Button("Clear")) { log.clear(); lines = 0; } if (ImGui::Button("Clear")) { log.clear(); lines = 0; }
ImGui::SameLine(); ImGui::SameLine();
@ -8762,9 +8764,32 @@ static void ShowExampleAppLongText(bool* opened)
lines += 1000; lines += 1000;
} }
ImGui::BeginChild("Log"); ImGui::BeginChild("Log");
ImGui::TextUnformatted(log.begin(), log.end()); switch (test_type)
{
case 0:
// Single call to TextUnformatted() with a big buffer
ImGui::TextUnformatted(log.begin(), log.end());
break;
case 1:
// Individual calls to Text(), manually clipped - demonstrate how to use the CalcListClipping() helper.
ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0,0));
int display_start, display_end;
ImGui::CalcListClipping(lines, ImGui::GetTextLineHeight(), &display_start, &display_end);
ImGui::SetCursorPosY(ImGui::GetCursorPosY() + (display_start) * ImGui::GetTextLineHeight());
for (int i = display_start; i < display_end; i++)
ImGui::Text("%i The quick brown fox jumps over the lazy dog\n", i);
ImGui::SetCursorPosY(ImGui::GetCursorPosY() + (lines - display_end) * ImGui::GetTextLineHeight());
ImGui::PopStyleVar();
break;
case 2:
// Individual calls to Text(), not clipped
ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0,0));
for (int i = 0; i < lines; i++)
ImGui::Text("%i The quick brown fox jumps over the lazy dog\n", i);
ImGui::PopStyleVar();
break;
}
ImGui::EndChild(); ImGui::EndChild();
ImGui::End(); ImGui::End();
} }