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Misc comments + Demo: use IsItemVisible() when using direct ImDrawList calls.

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ocornut
2022-06-07 11:38:43 +02:00
parent 65c4c0a490
commit 74f02703e6
3 changed files with 52 additions and 45 deletions
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80
imgui_demo.cpp
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@ -3202,59 +3202,58 @@ static void ShowDemoWindowLayout()
ImGui::DragFloat2("size", (float*)&size, 0.5f, 1.0f, 200.0f, "%.0f");
ImGui::TextWrapped("(Click and drag to scroll)");
HelpMarker(
"(Left) Using ImGui::PushClipRect():\n"
"Will alter ImGui hit-testing logic + ImDrawList rendering.\n"
"(use this if you want your clipping rectangle to affect interactions)\n\n"
"(Center) Using ImDrawList::PushClipRect():\n"
"Will alter ImDrawList rendering only.\n"
"(use this as a shortcut if you are only using ImDrawList calls)\n\n"
"(Right) Using ImDrawList::AddText() with a fine ClipRect:\n"
"Will alter only this specific ImDrawList::AddText() rendering.\n"
"This is often used internally to avoid altering the clipping rectangle and minimize draw calls.");
for (int n = 0; n < 3; n++)
{
if (n > 0)
ImGui::SameLine();
ImGui::PushID(n);
ImGui::BeginGroup(); // Lock X position
ImGui::InvisibleButton("##empty", size);
ImGui::PushID(n);
ImGui::InvisibleButton("##canvas", size);
if (ImGui::IsItemActive() && ImGui::IsMouseDragging(ImGuiMouseButton_Left))
{
offset.x += ImGui::GetIO().MouseDelta.x;
offset.y += ImGui::GetIO().MouseDelta.y;
}
ImGui::PopID();
if (!ImGui::IsItemVisible()) // Skip rendering as ImDrawList elements are not clipped.
continue;
const ImVec2 p0 = ImGui::GetItemRectMin();
const ImVec2 p1 = ImGui::GetItemRectMax();
const char* text_str = "Line 1 hello\nLine 2 clip me!";
const ImVec2 text_pos = ImVec2(p0.x + offset.x, p0.y + offset.y);
ImDrawList* draw_list = ImGui::GetWindowDrawList();
switch (n)
{
case 0:
HelpMarker(
"Using ImGui::PushClipRect():\n"
"Will alter ImGui hit-testing logic + ImDrawList rendering.\n"
"(use this if you want your clipping rectangle to affect interactions)");
ImGui::PushClipRect(p0, p1, true);
draw_list->AddRectFilled(p0, p1, IM_COL32(90, 90, 120, 255));
draw_list->AddText(text_pos, IM_COL32_WHITE, text_str);
ImGui::PopClipRect();
break;
case 1:
HelpMarker(
"Using ImDrawList::PushClipRect():\n"
"Will alter ImDrawList rendering only.\n"
"(use this as a shortcut if you are only using ImDrawList calls)");
draw_list->PushClipRect(p0, p1, true);
draw_list->AddRectFilled(p0, p1, IM_COL32(90, 90, 120, 255));
draw_list->AddText(text_pos, IM_COL32_WHITE, text_str);
draw_list->PopClipRect();
break;
case 2:
HelpMarker(
"Using ImDrawList::AddText() with a fine ClipRect:\n"
"Will alter only this specific ImDrawList::AddText() rendering.\n"
"(this is often used internally to avoid altering the clipping rectangle and minimize draw calls)");
ImVec4 clip_rect(p0.x, p0.y, p1.x, p1.y); // AddText() takes a ImVec4* here so let's convert.
draw_list->AddRectFilled(p0, p1, IM_COL32(90, 90, 120, 255));
draw_list->AddText(ImGui::GetFont(), ImGui::GetFontSize(), text_pos, IM_COL32_WHITE, text_str, NULL, 0.0f, &clip_rect);
break;
}
ImGui::EndGroup();
ImGui::PopID();
}
ImGui::TreePop();
@ -4841,7 +4840,7 @@ static void ShowDemoWindowTables()
ImGui::TableSetColumnIndex(1);
ImGui::SliderFloat("float1", &dummy_f, 0.0f, 1.0f);
ImGui::TableSetColumnIndex(2);
ImGui::SliderFloat("float2", &dummy_f, 0.0f, 1.0f);
ImGui::SliderFloat("##float2", &dummy_f, 0.0f, 1.0f); // No visible label since right-aligned
ImGui::PopID();
}
ImGui::EndTable();
@ -5755,26 +5754,31 @@ static void ShowDemoWindowMisc()
{ 2, 0, "", ImGuiKey_LeftShift },{ 2, 1, "Z", ImGuiKey_Z }, { 2, 2, "X", ImGuiKey_X }, { 2, 3, "C", ImGuiKey_C }, { 2, 4, "V", ImGuiKey_V }
};
ImDrawList* draw_list = ImGui::GetWindowDrawList();
draw_list->PushClipRect(board_min, board_max, true);
for (int n = 0; n < IM_ARRAYSIZE(keys_to_display); n++)
{
const KeyLayoutData* key_data = &keys_to_display[n];
ImVec2 key_min = ImVec2(start_pos.x + key_data->Col * key_step.x + key_data->Row * key_row_offset, start_pos.y + key_data->Row * key_step.y);
ImVec2 key_max = ImVec2(key_min.x + key_size.x, key_min.y + key_size.y);
draw_list->AddRectFilled(key_min, key_max, IM_COL32(204, 204, 204, 255), key_rounding);
draw_list->AddRect(key_min, key_max, IM_COL32(24, 24, 24, 255), key_rounding);
ImVec2 face_min = ImVec2(key_min.x + key_face_pos.x, key_min.y + key_face_pos.y);
ImVec2 face_max = ImVec2(face_min.x + key_face_size.x, face_min.y + key_face_size.y);
draw_list->AddRect(face_min, face_max, IM_COL32(193, 193, 193, 255), key_face_rounding, ImDrawFlags_None, 2.0f);
draw_list->AddRectFilled(face_min, face_max, IM_COL32(252, 252, 252, 255), key_face_rounding);
ImVec2 label_min = ImVec2(key_min.x + key_label_pos.x, key_min.y + key_label_pos.y);
draw_list->AddText(label_min, IM_COL32(64, 64, 64, 255), key_data->Label);
if (ImGui::IsKeyDown(key_data->Key))
draw_list->AddRectFilled(key_min, key_max, IM_COL32(255, 0, 0, 128), key_rounding);
}
draw_list->PopClipRect();
// Elements rendered manually via ImDrawList API are not clipped automatically.
// While not strictly necessary, here IsItemVisible() is used to avoid rendering these shapes when they are out of view.
ImGui::Dummy(ImVec2(board_max.x - board_min.x, board_max.y - board_min.y));
if (ImGui::IsItemVisible())
{
ImDrawList* draw_list = ImGui::GetWindowDrawList();
draw_list->PushClipRect(board_min, board_max, true);
for (int n = 0; n < IM_ARRAYSIZE(keys_to_display); n++)
{
const KeyLayoutData* key_data = &keys_to_display[n];
ImVec2 key_min = ImVec2(start_pos.x + key_data->Col * key_step.x + key_data->Row * key_row_offset, start_pos.y + key_data->Row * key_step.y);
ImVec2 key_max = ImVec2(key_min.x + key_size.x, key_min.y + key_size.y);
draw_list->AddRectFilled(key_min, key_max, IM_COL32(204, 204, 204, 255), key_rounding);
draw_list->AddRect(key_min, key_max, IM_COL32(24, 24, 24, 255), key_rounding);
ImVec2 face_min = ImVec2(key_min.x + key_face_pos.x, key_min.y + key_face_pos.y);
ImVec2 face_max = ImVec2(face_min.x + key_face_size.x, face_min.y + key_face_size.y);
draw_list->AddRect(face_min, face_max, IM_COL32(193, 193, 193, 255), key_face_rounding, ImDrawFlags_None, 2.0f);
draw_list->AddRectFilled(face_min, face_max, IM_COL32(252, 252, 252, 255), key_face_rounding);
ImVec2 label_min = ImVec2(key_min.x + key_label_pos.x, key_min.y + key_label_pos.y);
draw_list->AddText(label_min, IM_COL32(64, 64, 64, 255), key_data->Label);
if (ImGui::IsKeyDown(key_data->Key))
draw_list->AddRectFilled(key_min, key_max, IM_COL32(255, 0, 0, 128), key_rounding);
}
draw_list->PopClipRect();
}
}
ImGui::TreePop();
}