Demonstrate/test rendering huge amount of text, and the incidence of clipping.
| 9504 | |
| 9505 | // Demonstrate/test rendering huge amount of text, and the incidence of clipping. |
| 9506 | static void ShowExampleAppLongText(bool* p_open) |
| 9507 | { |
| 9508 | ImGui::SetNextWindowSize(ImVec2(520, 600), ImGuiCond_FirstUseEver); |
| 9509 | if (!ImGui::Begin("Example: Long text display", p_open)) |
| 9510 | { |
| 9511 | ImGui::End(); |
| 9512 | return; |
| 9513 | } |
| 9514 | IMGUI_DEMO_MARKER("Examples/Long text display"); |
| 9515 | |
| 9516 | static int test_type = 0; |
| 9517 | static ImGuiTextBuffer log; |
| 9518 | static int lines = 0; |
| 9519 | ImGui::Text("Printing unusually long amount of text."); |
| 9520 | ImGui::Combo("Test type", &test_type, |
| 9521 | "Single call to TextUnformatted()\0" |
| 9522 | "Multiple calls to Text(), clipped\0" |
| 9523 | "Multiple calls to Text(), not clipped (slow)\0"); |
| 9524 | ImGui::Text("Buffer contents: %d lines, %d bytes", lines, log.size()); |
| 9525 | if (ImGui::Button("Clear")) { log.clear(); lines = 0; } |
| 9526 | ImGui::SameLine(); |
| 9527 | if (ImGui::Button("Add 1000 lines")) |
| 9528 | { |
| 9529 | for (int i = 0; i < 1000; i++) |
| 9530 | log.appendf("%i The quick brown fox jumps over the lazy dog\n", lines + i); |
| 9531 | lines += 1000; |
| 9532 | } |
| 9533 | ImGui::BeginChild("Log"); |
| 9534 | switch (test_type) |
| 9535 | { |
| 9536 | case 0: |
| 9537 | // Single call to TextUnformatted() with a big buffer |
| 9538 | ImGui::TextUnformatted(log.begin(), log.end()); |
| 9539 | break; |
| 9540 | case 1: |
| 9541 | { |
| 9542 | // Multiple calls to Text(), manually coarsely clipped - demonstrate how to use the ImGuiListClipper helper. |
| 9543 | ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0)); |
| 9544 | ImGuiListClipper clipper; |
| 9545 | clipper.Begin(lines); |
| 9546 | while (clipper.Step()) |
| 9547 | for (int i = clipper.DisplayStart; i < clipper.DisplayEnd; i++) |
| 9548 | ImGui::Text("%i The quick brown fox jumps over the lazy dog", i); |
| 9549 | ImGui::PopStyleVar(); |
| 9550 | break; |
| 9551 | } |
| 9552 | case 2: |
| 9553 | // Multiple calls to Text(), not clipped (slow) |
| 9554 | ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0)); |
| 9555 | for (int i = 0; i < lines; i++) |
| 9556 | ImGui::Text("%i The quick brown fox jumps over the lazy dog", i); |
| 9557 | ImGui::PopStyleVar(); |
| 9558 | break; |
| 9559 | } |
| 9560 | ImGui::EndChild(); |
| 9561 | ImGui::End(); |
| 9562 | } |
| 9563 |