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Tables: Avoid allocating into ColumnsName for empty strings, changed TableGetColumnName() to return "" on missing name, generally more friendly.

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This commit is contained in:
ocornut 2020-10-26 11:49:56 +01:00
parent f4800db178
commit 75c5f534e8
2 changed files with 7 additions and 6 deletions
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2
imgui.h
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@ -701,7 +701,7 @@ namespace ImGui
// Make sure to set 'SpecsDirty = false' after sorting, else you may wastefully sort your data every frame!
// Lifetime: don't hold on this pointer over multiple frames or past any subsequent call to BeginTable().
IMGUI_API int TableGetColumnCount(); // return number of columns (value passed to BeginTable)
IMGUI_API const char* TableGetColumnName(int column_n = -1); // return NULL if column didn't have a name declared by TableSetupColumn(). Pass -1 to use current column.
IMGUI_API const char* TableGetColumnName(int column_n = -1); // return "" if column didn't have a name declared by TableSetupColumn(). Pass -1 to use current column.
IMGUI_API bool TableGetColumnIsVisible(int column_n = -1); // return true if column is visible. Same value is also returned by TableNextColumn() and TableSetColumnIndex(). Pass -1 to use current column.
IMGUI_API bool TableGetColumnIsSorted(int column_n = -1); // return true if column is included in the sort specs. Rarely used, can be useful to tell if a data change should trigger resort. Equivalent to test ImGuiTableSortSpecs's ->ColumnsMask & (1 << column_n). Pass -1 to use current column.
IMGUI_API int TableGetHoveredColumn(); // return hovered column. return -1 when table is not hovered. return columns_count if the unused space at the right of visible columns is hovered.

11
imgui_tables.cpp
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@ -173,8 +173,9 @@ bool ImGui::BeginTable(const char* str_id, int columns_count, ImGuiTableFlags
}
// For reference, the total _allocation count_ for a table is:
// + 0 (for ImGuiTable instance, we sharing allocation in g.Tables pool)
// + 0 (for ImGuiTable instance, we are pooling allocations in g.Tables)
// + 1 (for table->RawData allocated below)
// + 1 (for table->ColumnsNames, if names are used)
// + 1 (for table->Splitter._Channels)
// + 2 * active_channels_count (for ImDrawCmd and ImDrawIdx buffers inside channels)
// Where active_channels_count is variable but often == columns_count or columns_count + 1, see TableUpdateDrawChannels() for details.
@ -1601,7 +1602,7 @@ void ImGui::TableSetupColumn(const char* label, ImGuiTableColumnFlags flags,
// Store name (append with zero-terminator in contiguous buffer)
IM_ASSERT(column->NameOffset == -1);
if (label != NULL)
if (label != NULL && label[0] != 0)
{
column->NameOffset = (ImS16)table->ColumnsNames.size();
table->ColumnsNames.append(label, label + strlen(label) + 1);
@ -1963,7 +1964,7 @@ const char* ImGui::TableGetColumnName(const ImGuiTable* table, int column_n)
{
const ImGuiTableColumn* column = &table->Columns[column_n];
if (column->NameOffset == -1)
return NULL;
return "";
return &table->ColumnsNames.Buf[column->NameOffset];
}
@ -2080,7 +2081,7 @@ void ImGui::TableDrawContextMenu(ImGuiTable* table)
{
ImGuiTableColumn* other_column = &table->Columns[other_column_n];
const char* name = TableGetColumnName(table, other_column_n);
if (name == NULL)
if (name == NULL || name[0] == 0)
name = "<Unknown>";
// Make sure we can't hide the last active column
@ -2850,7 +2851,7 @@ void ImGui::DebugNodeTable(ImGuiTable* table)
"ContentWidth: Frozen %d, Unfrozen %d, HeadersUsed/Ideal %d/%d\n"
"SortOrder: %d, SortDir: %s\n"
"UserID: 0x%08X, Flags: 0x%04X: %s%s%s%s..",
n, column->DisplayOrder, name ? name : "NULL", column->MinX - table->WorkRect.Min.x, column->MaxX - table->WorkRect.Min.x,
n, column->DisplayOrder, name, column->MinX - table->WorkRect.Min.x, column->MaxX - table->WorkRect.Min.x,
column->IsVisible, column->IsClipped, column->DrawChannelFrozen, column->DrawChannelUnfrozen,
column->WidthGiven, column->WidthRequest, column->WidthStretchWeight,
column->ContentWidthFrozen, column->ContentWidthUnfrozen, column->ContentWidthHeadersUsed, column->ContentWidthHeadersIdeal,