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Tables: internals: extract TableSetColumnDisplayOrder() out of TableBeginApplyRequests() and clarify API limitations.

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ocornut
2026-02-10 18:12:53 +01:00
parent c71b2a1fe6
commit fd9873a5c2
2 changed files with 30 additions and 16 deletions
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1
imgui_internal.h
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@@ -3543,6 +3543,7 @@ namespace ImGui
IMGUI_API float TableCalcMaxColumnWidth(const ImGuiTable* table, int column_n);
IMGUI_API void TableSetColumnWidthAutoSingle(ImGuiTable* table, int column_n);
IMGUI_API void TableSetColumnWidthAutoAll(ImGuiTable* table);
IMGUI_API void TableSetColumnDisplayOrder(ImGuiTable* table, int column_n, int dst_order);
IMGUI_API void TableRemove(ImGuiTable* table);
IMGUI_API void TableGcCompactTransientBuffers(ImGuiTable* table);
IMGUI_API void TableGcCompactTransientBuffers(ImGuiTableTempData* table);

45
imgui_tables.cpp
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@@ -699,7 +699,7 @@ void ImGui::TableBeginApplyRequests(ImGuiTable* table)
}
// Handle reordering request
// Note: we don't clear ReorderColumn after handling the request.
// Note: we don't clear ReorderColumn after handling the request (FIXME: clarify why or add a test).
if (table->InstanceCurrent == 0)
{
if (table->HeldHeaderColumn == -1 && table->ReorderColumn != -1)
@@ -711,24 +711,12 @@ void ImGui::TableBeginApplyRequests(ImGuiTable* table)
// In the configuration below, moving C to the right of E will lead to:
// ... C [D] E ---> ... [D] E C (Column name/index)
// ... 2 3 4 ... 2 3 4 (Display order)
const int reorder_dir = table->ReorderColumnDir;
IM_ASSERT(reorder_dir == -1 || reorder_dir == +1);
IM_ASSERT(table->ReorderColumnDir == -1 || table->ReorderColumnDir == +1);
IM_ASSERT(table->Flags & ImGuiTableFlags_Reorderable);
ImGuiTableColumn* src_column = &table->Columns[table->ReorderColumn];
ImGuiTableColumn* dst_column = &table->Columns[(reorder_dir == -1) ? src_column->PrevEnabledColumn : src_column->NextEnabledColumn];
IM_UNUSED(dst_column);
const int src_order = src_column->DisplayOrder;
const int dst_order = dst_column->DisplayOrder;
src_column->DisplayOrder = (ImGuiTableColumnIdx)dst_order;
for (int order_n = src_order + reorder_dir; order_n != dst_order + reorder_dir; order_n += reorder_dir)
table->Columns[table->DisplayOrderToIndex[order_n]].DisplayOrder -= (ImGuiTableColumnIdx)reorder_dir;
IM_ASSERT(dst_column->DisplayOrder == dst_order - reorder_dir);
// Display order is stored in both columns->IndexDisplayOrder and table->DisplayOrder[]. Rebuild later from the former.
for (int column_n = 0; column_n < table->ColumnsCount; column_n++)
table->DisplayOrderToIndex[table->Columns[column_n].DisplayOrder] = (ImGuiTableColumnIdx)column_n;
ImGuiTableColumn* dst_column = &table->Columns[(table->ReorderColumnDir < 0) ? src_column->PrevEnabledColumn : src_column->NextEnabledColumn];
TableSetColumnDisplayOrder(table, table->ReorderColumn, dst_column->DisplayOrder);
table->ReorderColumnDir = 0;
table->IsSettingsDirty = true;
}
}
@@ -742,6 +730,31 @@ void ImGui::TableBeginApplyRequests(ImGuiTable* table)
}
}
// Note that TableSetupScrollFreeze() enforce a display order range for frozen columns.
// So reordering a column across the frozen column barrier is illegal and will be undone.
void ImGui::TableSetColumnDisplayOrder(ImGuiTable* table, int column_n, int dst_order)
{
IM_ASSERT(column_n >= 0 && column_n < table->ColumnsCount);
IM_ASSERT(dst_order >= 0 && dst_order < table->ColumnsCount);
ImGuiTableColumn* src_column = &table->Columns[column_n];
const int src_order = src_column->DisplayOrder;
if (src_order == dst_order)
return;
const int reorder_dir = (dst_order < src_order) ? -1 : +1;
src_column->DisplayOrder = (ImGuiTableColumnIdx)dst_order;
for (int order_n = src_order + reorder_dir; order_n != dst_order + reorder_dir; order_n += reorder_dir)
table->Columns[table->DisplayOrderToIndex[order_n]].DisplayOrder -= (ImGuiTableColumnIdx)reorder_dir;
//IM_ASSERT(dst_column->DisplayOrder == dst_order - reorder_dir);
// Display order is stored in both columns->IndexDisplayOrder and table->DisplayOrder[]. Rebuild later from the former.
// FIXME-OPT: If this is called multiple times we'd effectively have a O(N^2) thing going on.
for (int n = 0; n < table->ColumnsCount; n++)
table->DisplayOrderToIndex[table->Columns[n].DisplayOrder] = (ImGuiTableColumnIdx)n;
table->IsSettingsDirty = true;
}
// Adjust flags: default width mode + stretch columns are not allowed when auto extending
static void TableSetupColumnFlags(ImGuiTable* table, ImGuiTableColumn* column, ImGuiTableColumnFlags flags_in)
{