Demonstrate/test rendering huge amount of text, and the incidence of clipping.
| 7124 | |
| 7125 | // Demonstrate/test rendering huge amount of text, and the incidence of clipping. |
| 7126 | static void ShowExampleAppLongText(bool* p_open) |
| 7127 | { |
| 7128 | ImGui::SetNextWindowSize(ImVec2(520, 600), ImGuiCond_FirstUseEver); |
| 7129 | if (!ImGui::Begin("Example: Long text display", p_open)) |
| 7130 | { |
| 7131 | ImGui::End(); |
| 7132 | return; |
| 7133 | } |
| 7134 | IMGUI_DEMO_MARKER("Examples/Long text display"); |
| 7135 | |
| 7136 | static int test_type = 0; |
| 7137 | static ImGuiTextBuffer log; |
| 7138 | static int lines = 0; |
| 7139 | ImGui::Text("Printing unusually long amount of text."); |
| 7140 | ImGui::Combo("Test type", &test_type, |
| 7141 | "Single call to TextUnformatted()\0" |
| 7142 | "Multiple calls to Text(), clipped\0" |
| 7143 | "Multiple calls to Text(), not clipped (slow)\0"); |
| 7144 | ImGui::Text("Buffer contents: %d lines, %d bytes", lines, log.size()); |
| 7145 | if (ImGui::Button("Clear")) { log.clear(); lines = 0; } |
| 7146 | ImGui::SameLine(); |
| 7147 | if (ImGui::Button("Add 1000 lines")) |
| 7148 | { |
| 7149 | for (int i = 0; i < 1000; i++) |
| 7150 | log.appendf("%i The quick brown fox jumps over the lazy dog\n", lines + i); |
| 7151 | lines += 1000; |
| 7152 | } |
| 7153 | ImGui::BeginChild("Log"); |
| 7154 | switch (test_type) |
| 7155 | { |
| 7156 | case 0: |
| 7157 | // Single call to TextUnformatted() with a big buffer |
| 7158 | ImGui::TextUnformatted(log.begin(), log.end()); |
| 7159 | break; |
| 7160 | case 1: |
| 7161 | { |
| 7162 | // Multiple calls to Text(), manually coarsely clipped - demonstrate how to use the ImGuiListClipper helper. |
| 7163 | ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0)); |
| 7164 | ImGuiListClipper clipper; |
| 7165 | clipper.Begin(lines); |
| 7166 | while (clipper.Step()) |
| 7167 | for (int i = clipper.DisplayStart; i < clipper.DisplayEnd; i++) |
| 7168 | ImGui::Text("%i The quick brown fox jumps over the lazy dog", i); |
| 7169 | ImGui::PopStyleVar(); |
| 7170 | break; |
| 7171 | } |
| 7172 | case 2: |
| 7173 | // Multiple calls to Text(), not clipped (slow) |
| 7174 | ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0)); |
| 7175 | for (int i = 0; i < lines; i++) |
| 7176 | ImGui::Text("%i The quick brown fox jumps over the lazy dog", i); |
| 7177 | ImGui::PopStyleVar(); |
| 7178 | break; |
| 7179 | } |
| 7180 | ImGui::EndChild(); |
| 7181 | ImGui::End(); |
| 7182 | } |
| 7183 |