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Tables: Better preserve column data (mainly widths) when columns count changes. (#4046) + .ini skips columns with no data.

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This commit is contained in:
ocornut
2021-04-16 18:27:48 +02:00
parent 690a90bd35
commit 770f9daab3
3 changed files with 27 additions and 9 deletions
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33
imgui_tables.cpp
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@ -470,10 +470,14 @@ bool ImGui::BeginTableEx(const char* name, ImGuiID id, int columns_count, ImG
table->MemoryCompacted = false;
// Setup memory buffer (clear data if columns count changed)
const int stored_size = table->Columns.size();
if (stored_size != 0 && stored_size != columns_count)
ImGuiTableColumn* old_columns_to_preserve = NULL;
void* old_columns_raw_data = NULL;
const int old_columns_count = table->Columns.size();
if (old_columns_count != 0 && old_columns_count != columns_count)
{
IM_FREE(table->RawData);
// Attempt to preserve width on column count change (#4046)
old_columns_to_preserve = table->Columns.Data;
old_columns_raw_data = table->RawData;
table->RawData = NULL;
}
if (table->RawData == NULL)
@ -496,14 +500,24 @@ bool ImGui::BeginTableEx(const char* name, ImGuiID id, int columns_count, ImG
for (int n = 0; n < columns_count; n++)
{
ImGuiTableColumn* column = &table->Columns[n];
float width_auto = column->WidthAuto;
*column = ImGuiTableColumn();
column->WidthAuto = width_auto;
column->IsPreserveWidthAuto = true; // Preserve WidthAuto when reinitializing a live table: not technically necessary but remove a visible flicker
if (old_columns_to_preserve && n < old_columns_count)
{
// FIXME: We don't attempt to preserve column order in this path.
*column = old_columns_to_preserve[n];
}
else
{
float width_auto = column->WidthAuto;
*column = ImGuiTableColumn();
column->WidthAuto = width_auto;
column->IsPreserveWidthAuto = true; // Preserve WidthAuto when reinitializing a live table: not technically necessary but remove a visible flicker
column->IsEnabled = column->IsEnabledNextFrame = true;
}
column->DisplayOrder = table->DisplayOrderToIndex[n] = (ImGuiTableColumnIdx)n;
column->IsEnabled = column->IsEnabledNextFrame = true;
}
}
if (old_columns_raw_data)
IM_FREE(old_columns_raw_data);
// Load settings
if (table->IsSettingsRequestLoad)
@ -3350,6 +3364,9 @@ static void TableSettingsHandler_WriteAll(ImGuiContext* ctx, ImGuiSettingsHandle
for (int column_n = 0; column_n < settings->ColumnsCount; column_n++, column++)
{
// "Column 0 UserID=0x42AD2D21 Width=100 Visible=1 Order=0 Sort=0v"
bool save_column = column->UserID != 0 || save_size || save_visible || save_order || (save_sort && column->SortOrder != -1);
if (!save_column)
continue;
buf->appendf("Column %-2d", column_n);
if (column->UserID != 0) buf->appendf(" UserID=%08X", column->UserID);
if (save_size && column->IsStretch) buf->appendf(" Weight=%.4f", column->WidthOrWeight);