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Tables: Extracted parts of BeginTable() into TableFixFlags() and TableBeginInitMemory().

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This commit is contained in:
ocornut 2020-10-21 14:07:26 +02:00
parent ac5b1648e6
commit f4800db178
1 changed files with 46 additions and 44 deletions
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90
imgui_tables.cpp
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@ -96,7 +96,7 @@ static const float TABLE_RESIZE_SEPARATOR_HALF_THICKNESS = 4.0f; // Extend ou
static const float TABLE_RESIZE_SEPARATOR_FEEDBACK_TIMER = 0.06f; // Delay/timer before making the hover feedback (color+cursor) visible because tables/columns tends to be more cramped.
// Helper
inline ImGuiTableFlags TableFixFlags(ImGuiTableFlags flags)
inline ImGuiTableFlags TableFixFlags(ImGuiTableFlags flags, ImGuiWindow* outer_window)
{
// Adjust flags: set default sizing policy
if ((flags & ImGuiTableFlags_SizingPolicyMaskX_) == 0)
@ -122,6 +122,15 @@ inline ImGuiTableFlags TableFixFlags(ImGuiTableFlags flags)
if (flags & ImGuiTableFlags_NoBordersInBodyUntilResize)
flags &= ~ImGuiTableFlags_NoBordersInBody;
// Inherit _NoSavedSettings from top-level window (child windows always have _NoSavedSettings set)
#ifdef IMGUI_HAS_DOCK
ImGuiWindow* window_for_settings = outer_window->RootWindowDockStop;
#else
ImGuiWindow* window_for_settings = outer_window->RootWindow;
#endif
if (window_for_settings->Flags & ImGuiWindowFlags_NoSavedSettings)
flags |= ImGuiTableFlags_NoSavedSettings;
return flags;
}
@ -163,6 +172,34 @@ bool ImGui::BeginTable(const char* str_id, int columns_count, ImGuiTableFlags
return BeginTableEx(str_id, id, columns_count, flags, outer_size, inner_width);
}
// For reference, the total _allocation count_ for a table is:
// + 0 (for ImGuiTable instance, we sharing allocation in g.Tables pool)
// + 1 (for table->RawData allocated below)
// + 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.
// Unused channels don't perform their +2 allocations.
static void TableBeginInitMemory(ImGuiTable* table, int columns_count)
{
// Allocate single buffer for our arrays
ImSpanAllocator<3> span_allocator;
span_allocator.ReserveBytes(0, columns_count * sizeof(ImGuiTableColumn));
span_allocator.ReserveBytes(1, columns_count * sizeof(ImS8));
span_allocator.ReserveBytes(2, columns_count * sizeof(ImGuiTableCellData));
table->RawData.resize(span_allocator.GetArenaSizeInBytes());
span_allocator.SetArenaBasePtr(table->RawData.Data);
span_allocator.GetSpan(0, &table->Columns);
span_allocator.GetSpan(1, &table->DisplayOrderToIndex);
span_allocator.GetSpan(2, &table->RowCellData);
for (int n = 0; n < columns_count; n++)
{
table->Columns[n] = ImGuiTableColumn();
table->Columns[n].DisplayOrder = table->DisplayOrderToIndex[n] = (ImS8)n;
}
table->IsInitializing = table->IsSettingsRequestLoad = table->IsSortSpecsDirty = true;
}
bool ImGui::BeginTableEx(const char* name, ImGuiID id, int columns_count, ImGuiTableFlags flags, const ImVec2& outer_size, float inner_width)
{
ImGuiContext& g = *GImGui;
@ -175,37 +212,28 @@ bool ImGui::BeginTableEx(const char* name, ImGuiID id, int columns_count, ImG
if (flags & ImGuiTableFlags_ScrollX)
IM_ASSERT(inner_width >= 0.0f);
// If an outer size is specified ahead we will be able to early out when not visible. Exact clipping rules may evolve.
const bool use_child_window = (flags & (ImGuiTableFlags_ScrollX | ImGuiTableFlags_ScrollY)) != 0;
const ImVec2 avail_size = GetContentRegionAvail();
ImVec2 actual_outer_size = CalcItemSize(outer_size, ImMax(avail_size.x, 1.0f), use_child_window ? ImMax(avail_size.y, 1.0f) : 0.0f);
ImRect outer_rect(outer_window->DC.CursorPos, outer_window->DC.CursorPos + actual_outer_size);
// If an outer size is specified ahead we will be able to early out when not visible. Exact clipping rules may evolve.
if (use_child_window && IsClippedEx(outer_rect, 0, false))
{
ItemSize(outer_rect);
return false;
}
flags = TableFixFlags(flags);
// Inherit _NoSavedSettings from top-level window (child windows always have _NoSavedSettings set)
#ifdef IMGUI_HAS_DOCK
ImGuiWindow* window_for_settings = outer_window->RootWindowDockStop;
#else
ImGuiWindow* window_for_settings = outer_window->RootWindow;
#endif
if (window_for_settings->Flags & ImGuiWindowFlags_NoSavedSettings)
flags |= ImGuiTableFlags_NoSavedSettings;
// Acquire storage for the table
ImGuiTable* table = g.Tables.GetOrAddByKey(id);
const ImGuiTableFlags table_last_flags = table->Flags;
const int instance_no = (table->LastFrameActive != g.FrameCount) ? 0 : table->InstanceCurrent + 1;
const ImGuiID instance_id = id + instance_no;
const ImGuiTableFlags table_last_flags = table->Flags;
if (instance_no > 0)
IM_ASSERT(table->ColumnsCount == columns_count && "BeginTable(): Cannot change columns count mid-frame while preserving same ID");
// Fix flags
flags = TableFixFlags(flags, outer_window);
// Initialize
table->ID = id;
table->Flags = flags;
@ -248,7 +276,7 @@ bool ImGui::BeginTableEx(const char* name, ImGuiID id, int columns_count, ImG
IM_ASSERT(table->InnerWindow->WindowPadding.x == 0.0f && table->InnerWindow->WindowPadding.y == 0.0f && table->InnerWindow->WindowBorderSize == 0.0f);
}
// Push a standardized ID for both child and not-child using tables, equivalent to BeginTable() doing PushID(label) matching
// Push a standardized ID for both child-using and not-child-using tables
PushOverrideID(instance_id);
// Backup a copy of host window members we will modify
@ -306,38 +334,12 @@ bool ImGui::BeginTableEx(const char* name, ImGuiID id, int columns_count, ImG
if ((table_last_flags & ImGuiTableFlags_Reorderable) && !(flags & ImGuiTableFlags_Reorderable))
table->IsResetDisplayOrderRequest = true;
// Setup default columns state. Clear data if columns count changed
// Setup memory buffer (clear data if columns count changed)
const int stored_size = table->Columns.size();
if (stored_size != 0 && stored_size != columns_count)
table->RawData.resize(0);
if (table->RawData.Size == 0)
{
// For reference, the total _allocation count_ for a table is:
// + 0 (for ImGuiTable instance, we sharing allocation in g.Tables pool)
// + 1 (for table->RawData allocated below)
// + 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.
// Unused channels don't perform their +2 allocations.
// Allocate single buffer for our arrays
ImSpanAllocator<3> span_allocator;
span_allocator.ReserveBytes(0, columns_count * sizeof(ImGuiTableColumn));
span_allocator.ReserveBytes(1, columns_count * sizeof(ImS8));
span_allocator.ReserveBytes(2, columns_count * sizeof(ImGuiTableCellData));
table->RawData.resize(span_allocator.GetArenaSizeInBytes());
span_allocator.SetArenaBasePtr(table->RawData.Data);
span_allocator.GetSpan(0, &table->Columns);
span_allocator.GetSpan(1, &table->DisplayOrderToIndex);
span_allocator.GetSpan(2, &table->RowCellData);
for (int n = 0; n < columns_count; n++)
{
table->Columns[n] = ImGuiTableColumn();
table->Columns[n].DisplayOrder = table->DisplayOrderToIndex[n] = (ImS8)n;
}
table->IsInitializing = table->IsSettingsRequestLoad = table->IsSortSpecsDirty = true;
}
TableBeginInitMemory(table, columns_count);
// Load settings
if (table->IsSettingsRequestLoad)