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MultiSelect: Demo: added simpler demo using Clipper. Clarify RangeSrcPassedBy doc.

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ocornut
2023-08-23 19:47:24 +02:00
parent c3753809b1
commit 6ddc5f38af
2 changed files with 52 additions and 8 deletions
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48
imgui_demo.cpp
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@@ -2911,7 +2911,7 @@ static void ShowDemoWindowMultiSelect()
ImGui::TreePop();
}
const char* random_names[] =
static const char* random_names[] =
{
"Artichoke", "Arugula", "Asparagus", "Avocado", "Bamboo Shoots", "Bean Sprouts", "Beans", "Beet", "Belgian Endive", "Bell Pepper",
"Bitter Gourd", "Bok Choy", "Broccoli", "Brussels Sprouts", "Burdock Root", "Cabbage", "Calabash", "Capers", "Carrot", "Cassava",
@@ -2935,7 +2935,7 @@ static void ShowDemoWindowMultiSelect()
// The BeginListBox() has no actual purpose for selection logic (other that offering a scrolling region).
const int ITEMS_COUNT = 50;
ImGui::Text("Selection size: %d", selection.GetSize());
ImGui::Text("Selection: %d/%d", selection.GetSize(), ITEMS_COUNT);
if (ImGui::BeginListBox("##Basket", ImVec2(-FLT_MIN, ImGui::GetFontSize() * 20)))
{
ImGuiMultiSelectFlags flags = ImGuiMultiSelectFlags_ClearOnEscape;
@@ -2951,7 +2951,49 @@ static void ShowDemoWindowMultiSelect()
ImGui::Selectable(label, item_is_selected);
}
// Apply multi-select requests
ms_io = ImGui::EndMultiSelect();
selection.ApplyRequests(ms_io, ITEMS_COUNT);
ImGui::EndListBox();
}
ImGui::TreePop();
}
// Demonstrate using the clipper with BeginMultiSelect()/EndMultiSelect()
IMGUI_DEMO_MARKER("Widgets/Selection State/Multi-Select (with clipper)");
if (ImGui::TreeNode("Multi-Select (with clipper)"))
{
static ExampleSelection selection;
ImGui::Text("Added features:");
ImGui::BulletText("Using ImGuiListClipper.");
const int ITEMS_COUNT = 10000;
ImGui::Text("Selection: %d/%d", selection.GetSize(), ITEMS_COUNT);
if (ImGui::BeginListBox("##Basket", ImVec2(-FLT_MIN, ImGui::GetFontSize() * 20)))
{
ImGuiMultiSelectFlags flags = ImGuiMultiSelectFlags_ClearOnEscape;
ImGuiMultiSelectIO* ms_io = ImGui::BeginMultiSelect(flags);
selection.ApplyRequests(ms_io, ITEMS_COUNT);
ImGuiListClipper clipper;
clipper.Begin(ITEMS_COUNT);
while (clipper.Step())
{
if (!ms_io->RangeSrcPassedBy && clipper.DisplayStart > ms_io->RangeSrcItem)
ms_io->RangeSrcPassedBy = true;
for (int n = clipper.DisplayStart; n < clipper.DisplayEnd; n++)
{
char label[64];
sprintf(label, "Object %05d: %s", n, random_names[n % IM_ARRAYSIZE(random_names)]);
bool item_is_selected = selection.Contains(n);
ImGui::SetNextItemSelectionUserData(n);
ImGui::Selectable(label, item_is_selected);
}
}
if (!ms_io->RangeSrcPassedBy && ITEMS_COUNT > ms_io->RangeSrcItem)
ms_io->RangeSrcPassedBy = true;
ms_io = ImGui::EndMultiSelect();
selection.ApplyRequests(ms_io, ITEMS_COUNT);