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Tables: comments and tweaks on TableUpdateLayout(). changed "apply final width" loop to use natural column order.

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This commit is contained in:
ocornut 2020-12-03 09:40:47 +01:00
parent 155b8bb816
commit f70bf69e3b
3 changed files with 76 additions and 89 deletions
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15
imgui.h
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@ -663,19 +663,20 @@ namespace ImGui
// - 3. Optionally call TableSetupScrollFreeze() to request scroll freezing of columns/rows
// - 4. Optionally call TableHeadersRow() to submit a header row (names will be pulled from data submitted to TableSetupColumns)
// - 5. Populate contents
// - In most situations you can use TableNextRow() + TableSetColumnIndex(xx) to start appending into a column.
// - In most situations you can use TableNextRow() + TableSetColumnIndex(N) to start appending into a column.
// - If you are using tables as a sort of grid, where every columns is holding the same type of contents,
// you may prefer using TableNextColumn() instead of TableNextRow() + TableSetColumnIndex().
// TableNextColumn() will automatically wrap-around into the next row if needed.
// - IMPORTANT: Comparatively to the old Columns() API, we need to call TableNextColumn() for the first column!
// - Both TableSetColumnIndex() and TableNextColumn() return false when the column is not visible, so you can
// skip submitting the contents of a cell but only if you know the contents is not going to alter row height.
// skip submitting the contents of a cell BUT ONLY if you know the contents is not going to alter row height.
// In many situations, you may skip submitting contents for every columns but one (e.g. the first one).
// - Summary of possible call flow:
// ----------------------------------------------------------------------------------------------------------
// TableNextRow() -> TableSetColumnIndex(0) -> Text("Hello 0") -> TableSetColumnIndex(1) -> Text("Hello 1") // OK
// TableNextRow() -> TableNextColumn() Text("Hello 0") -> TableNextColumn() -> Text("Hello 1") // OK
// TableNextColumn() Text("Hello 0") -> TableNextColumn() -> Text("Hello 1") // OK: TableNextColumn() automatically gets to next row!
// TableNextRow() Text("Hello 0") // Not OK! Missing TableSetColumnIndex() or TableNextColumn()! Text will not appear!
// TableNextRow() -> TableNextColumn() -> Text("Hello 0") -> TableNextColumn() -> Text("Hello 1") // OK
// TableNextColumn() -> Text("Hello 0") -> TableNextColumn() -> Text("Hello 1") // OK: TableNextColumn() automatically gets to next row!
// TableNextRow() -> Text("Hello 0") // Not OK! Missing TableSetColumnIndex() or TableNextColumn()! Text will not appear!
// ----------------------------------------------------------------------------------------------------------
// - 5. Call EndTable()
#define IMGUI_HAS_TABLE 1
@ -1109,8 +1110,8 @@ enum ImGuiTableColumnFlags_
ImGuiTableColumnFlags_NoHeaderWidth = 1 << 12, // Header width don't contribute to automatic column width.
ImGuiTableColumnFlags_PreferSortAscending = 1 << 13, // Make the initial sort direction Ascending when first sorting on this column (default).
ImGuiTableColumnFlags_PreferSortDescending = 1 << 14, // Make the initial sort direction Descending when first sorting on this column.
ImGuiTableColumnFlags_IndentEnable = 1 << 15, // Use current Indent value when entering cell (default for 1st column).
ImGuiTableColumnFlags_IndentDisable = 1 << 16, // Ignore current Indent value when entering cell (default for columns after the 1st one). Indentation changes _within_ the cell will still be honored.
ImGuiTableColumnFlags_IndentEnable = 1 << 15, // Use current Indent value when entering cell (default for column 0).
ImGuiTableColumnFlags_IndentDisable = 1 << 16, // Ignore current Indent value when entering cell (default for columns > 0). Indentation changes _within_ the cell will still be honored.
// [Internal] Combinations and masks
ImGuiTableColumnFlags_WidthMask_ = ImGuiTableColumnFlags_WidthStretch | ImGuiTableColumnFlags_WidthFixed | ImGuiTableColumnFlags_WidthAutoResize,

7
imgui_internal.h
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@ -1898,7 +1898,8 @@ typedef ImS8 ImGuiTableColumnIdx;
typedef ImU8 ImGuiTableDrawChannelIdx;
// [Internal] sizeof() ~ 104
// We use the terminology "Visible" to refer to a columns that are not Hidden by user or settings. However it may still be out of view and clipped (and IsClipped would be set).
// We use the terminology "Enabled" to refer to a column that is not Hidden by user/api.
// We use the terminology "Clipped" to refer to a column that is out of sight because of scrolling/clipping.
// This is in contrast with some user-facing api such as IsItemVisible() / IsRectVisible() which use "Visible" to mean "not clipped".
struct ImGuiTableColumn
{
@ -1932,7 +1933,7 @@ struct ImGuiTableColumn
bool IsEnabled; // Is the column not marked Hidden by the user? (even if off view, e.g. clipped by scrolling).
bool IsEnabledNextFrame;
bool IsClipped; // Is not actually in view (e.g. not overlapping the host window clipping rectangle).
bool IsSkipItems; // Do we want item submissions to this column to be ignored early on.
bool IsSkipItems; // Do we want item submissions to this column to be completely ignored (no layout will happen).
ImS8 NavLayerCurrent; // ImGuiNavLayer in 1 byte
ImS8 SortDirection; // ImGuiSortDirection_Ascending or ImGuiSortDirection_Descending
ImU8 AutoFitQueue; // Queue of 8 values for the next 8 frames to request auto-fit
@ -1969,9 +1970,9 @@ struct ImGuiTable
ImSpan<ImGuiTableColumn> Columns; // Point within RawData[]
ImSpan<ImGuiTableColumnIdx> DisplayOrderToIndex; // Point within RawData[]. Store display order of columns (when not reordered, the values are 0...Count-1)
ImSpan<ImGuiTableCellData> RowCellData; // Point within RawData[]. Store cells background requests for current row.
ImU64 EnabledMaskByIndex; // Column Index -> IsEnabled map (== not hidden by user/api) in a format adequate for iterating column without touching cold data
ImU64 EnabledMaskByDisplayOrder; // Column DisplayOrder -> IsEnabled map
ImU64 EnabledUnclippedMaskByIndex;// Enabled and not Clipped, aka "actually visible" "not hidden by some scrolling"
ImU64 EnabledMaskByIndex; // Column Index -> IsEnabled map (== not hidden by user/api) in a format adequate for iterating column without touching cold data
ImGuiTableFlags SettingsLoadedFlags; // Which data were loaded from the .ini file (e.g. when order is not altered we won't save order)
int SettingsOffset; // Offset in g.SettingsTables
int LastFrameActive;

143
imgui_tables.cpp
View File

@ -569,7 +569,7 @@ static float TableGetMinColumnWidth()
return g.Style.FramePadding.x * 1.0f;
}
// Layout columns for the frame
// Layout columns for the frame. This is in essence the followup to BeginTable().
// Runs on the first call to TableNextRow(), to give a chance for TableSetupColumn() to be called first.
// FIXME-TABLE: Our width (and therefore our WorkRect) will be minimal in the first frame for WidthAutoResize
// columns, increase feedback side-effect with widgets relying on WorkRect.Max.x. Maybe provide a default distribution
@ -579,14 +579,14 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
ImGuiContext& g = *GImGui;
IM_ASSERT(table->IsLayoutLocked == false);
table->HoveredColumnBody = -1;
table->HoveredColumnBorder = -1;
// Lock Enabled state and Order
ImGuiTableColumn* last_visible_column = NULL;
// [Part 1] Apply/lock Enabled and Order states.
// Process columns in their visible orders as we are building the Prev/Next indices.
int last_visible_column_idx = -1;
bool want_column_auto_fit = false;
table->IsDefaultDisplayOrder = true;
table->ColumnsEnabledCount = 0;
table->EnabledMaskByIndex = 0x00;
table->EnabledMaskByDisplayOrder = 0x00;
for (int order_n = 0; order_n < table->ColumnsCount; order_n++)
{
const int column_n = table->DisplayOrderToIndex[order_n];
@ -611,46 +611,41 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
ImU64 display_order_mask = (ImU64)1 << column->DisplayOrder;
if (column->IsEnabled)
{
column->PrevEnabledColumn = column->NextEnabledColumn = -1;
if (last_visible_column)
{
last_visible_column->NextEnabledColumn = (ImGuiTableColumnIdx)column_n;
column->PrevEnabledColumn = (ImGuiTableColumnIdx)table->Columns.index_from_ptr(last_visible_column);
}
column->PrevEnabledColumn = (ImGuiTableColumnIdx)last_visible_column_idx;
column->NextEnabledColumn = -1;
if (last_visible_column_idx != -1)
table->Columns[last_visible_column_idx].NextEnabledColumn = (ImGuiTableColumnIdx)column_n;
column->IndexWithinEnabledSet = table->ColumnsEnabledCount;
table->ColumnsEnabledCount++;
table->EnabledMaskByIndex |= index_mask;
table->EnabledMaskByDisplayOrder |= display_order_mask;
last_visible_column = column;
last_visible_column_idx = column_n;
}
else
{
column->IndexWithinEnabledSet = -1;
table->EnabledMaskByIndex &= ~index_mask;
table->EnabledMaskByDisplayOrder &= ~display_order_mask;
}
IM_ASSERT(column->IndexWithinEnabledSet <= column->DisplayOrder);
}
table->EnabledUnclippedMaskByIndex = table->EnabledMaskByIndex; // Columns will be masked out below when Clipped
table->RightMostEnabledColumn = (ImGuiTableColumnIdx)(last_visible_column ? table->Columns.index_from_ptr(last_visible_column) : -1);
table->RightMostEnabledColumn = (ImGuiTableColumnIdx)last_visible_column_idx;
// Disable child window clipping while fitting columns. This is not strictly necessary but makes it possible to avoid
// the column fitting to wait until the first visible frame of the child container (may or not be a good thing).
// [Part 2] Disable child window clipping while fitting columns. This is not strictly necessary but makes it possible
// to avoid the column fitting to wait until the first visible frame of the child container (may or not be a good thing).
// FIXME-TABLE: for always auto-resizing columns may not want to do that all the time.
if (want_column_auto_fit && table->OuterWindow != table->InnerWindow)
table->InnerWindow->SkipItems = false;
if (want_column_auto_fit)
table->IsSettingsDirty = true;
// Compute offset, clip rect for the frame
// (can't make auto padding larger than what WorkRect knows about so right-alignment matches)
const ImRect work_rect = table->WorkRect;
// [Part 3] Fix column flags. Calculate ideal width for columns. Count how many fixed/stretch columns we have and sum of weights.
const float min_column_width = TableGetMinColumnWidth();
const float min_column_distance = min_column_width + table->CellPaddingX * 2.0f + table->CellSpacingX1 + table->CellSpacingX2;
int count_fixed = 0;
int count_fixed = 0; // Number of columns that have fixed sizing policy (not stretched sizing policy) (this is NOT the opposite of count_resizable!)
int count_resizable = 0; // Number of columns the user can resize (this is NOT the opposite of count_fixed!)
float sum_weights_stretched = 0.0f; // Sum of all weights for weighted columns.
float sum_width_fixed_requests = 0.0f; // Sum of all width for fixed and auto-resize columns, excluding width contributed by Stretch columns.
float max_width_auto = 0.0f;
float max_width_auto = 0.0f; // Largest auto-width (used for SameWidths feature)
table->LeftMostStretchedColumnDisplayOrder = -1;
for (int column_n = 0; column_n < table->ColumnsCount; column_n++)
{
@ -663,6 +658,8 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
column->Flags = TableFixColumnFlags(table, column->FlagsIn);
if ((column->Flags & ImGuiTableColumnFlags_IndentMask_) == 0)
column->Flags |= (column_n == 0) ? ImGuiTableColumnFlags_IndentEnable : ImGuiTableColumnFlags_IndentDisable;
if ((column->Flags & ImGuiTableColumnFlags_NoResize) == 0)
count_resizable++;
// We have a unusual edge case where if the user doesn't call TableGetSortSpecs() but has sorting enabled
// or varying sorting flags, we still want the sorting arrows to honor those flags.
@ -684,7 +681,6 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
width_auto = ImMax(width_auto, column->InitStretchWeightOrWidth);
column->WidthAuto = width_auto;
if (column->Flags & (ImGuiTableColumnFlags_WidthFixed | ImGuiTableColumnFlags_WidthAutoResize))
{
// Process auto-fit for non-stretched columns
@ -699,7 +695,6 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
// FIXME: Move this to ->WidthGiven to avoid temporary lossyless?
if (column->AutoFitQueue > 0x01 && table->IsInitializing)
column->WidthRequest = ImMax(column->WidthRequest, min_column_width * 4.0f); // FIXME-TABLE: Another constant/scale?
count_fixed += 1;
sum_width_fixed_requests += column->WidthRequest;
}
@ -718,47 +713,45 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
}
table->ColumnsEnabledFixedCount = (ImGuiTableColumnIdx)count_fixed;
// Apply "same widths"
// - When all columns are fixed or columns are of mixed type: use the maximum auto width
// - When all columns are stretch: use same weight
// [Part 4] Apply "same widths" feature.
// - When all columns are fixed or columns are of mixed type: use the maximum auto width.
// - When all columns are stretch: use same weight.
const bool mixed_same_widths = (table->Flags & ImGuiTableFlags_SameWidths) && count_fixed > 0;
if (table->Flags & ImGuiTableFlags_SameWidths)
{
for (int column_n = 0; column_n < table->ColumnsCount; column_n++)
if (table->EnabledMaskByIndex & ((ImU64)1 << column_n))
{
if (!(table->EnabledMaskByIndex & ((ImU64)1 << column_n)))
continue;
ImGuiTableColumn* column = &table->Columns[column_n];
if (column->Flags & (ImGuiTableColumnFlags_WidthFixed | ImGuiTableColumnFlags_WidthAutoResize))
{
ImGuiTableColumn* column = &table->Columns[column_n];
if (column->Flags & (ImGuiTableColumnFlags_WidthFixed | ImGuiTableColumnFlags_WidthAutoResize))
{
sum_width_fixed_requests += max_width_auto - column->WidthRequest; // Update old sum
column->WidthRequest = max_width_auto;
}
else
{
sum_weights_stretched += 1.0f - column->StretchWeight; // Update old sum
column->StretchWeight = 1.0f;
if (count_fixed > 0)
column->WidthRequest = max_width_auto;
}
sum_width_fixed_requests += max_width_auto - column->WidthRequest; // Update old sum
column->WidthRequest = max_width_auto;
}
else
{
sum_weights_stretched += 1.0f - column->StretchWeight; // Update old sum
column->StretchWeight = 1.0f;
if (count_fixed > 0)
column->WidthRequest = max_width_auto;
}
}
}
// Layout
// [Part 5] Apply final widths based on requested widths
const ImRect work_rect = table->WorkRect;
const float width_spacings = (table->OuterPaddingX * 2.0f) + (table->CellSpacingX1 + table->CellSpacingX2) * (table->ColumnsEnabledCount - 1);
const float width_avail = ((table->Flags & ImGuiTableFlags_ScrollX) && table->InnerWidth == 0.0f) ? table->InnerClipRect.GetWidth() : work_rect.GetWidth();
const float width_avail_for_stretched_columns = mixed_same_widths ? 0.0f : width_avail - width_spacings - sum_width_fixed_requests;
float width_remaining_for_stretched_columns = width_avail_for_stretched_columns;
// Apply final width based on requested widths
// Mark some columns as not resizable
int count_resizable = 0;
table->ColumnsTotalWidth = width_spacings;
table->ColumnsAutoFitWidth = width_spacings;
for (int order_n = 0; order_n < table->ColumnsCount; order_n++)
for (int column_n = 0; column_n < table->ColumnsCount; column_n++)
{
if (!(table->EnabledMaskByDisplayOrder & ((ImU64)1 << order_n)))
if (!(table->EnabledMaskByIndex & ((ImU64)1 << column_n)))
continue;
ImGuiTableColumn* column = &table->Columns[table->DisplayOrderToIndex[order_n]];
ImGuiTableColumn* column = &table->Columns[column_n];
// Allocate width for stretched/weighted columns
if (column->Flags & ImGuiTableColumnFlags_WidthStretch)
@ -784,18 +777,14 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
if (column->NextEnabledColumn == -1 && table->LeftMostStretchedColumnDisplayOrder != -1)
column->Flags |= ImGuiTableColumnFlags_NoDirectResize_;
if (!(column->Flags & ImGuiTableColumnFlags_NoResize))
count_resizable++;
// Assign final width, record width in case we will need to shrink
column->WidthGiven = ImFloor(ImMax(column->WidthRequest, min_column_width));
table->ColumnsTotalWidth += column->WidthGiven + table->CellPaddingX * 2.0f;
table->ColumnsAutoFitWidth += column->WidthAuto + table->CellPaddingX * 2.0f;
}
// Redistribute remainder width due to rounding (remainder width is < 1.0f * number of Stretch column).
// Using right-to-left distribution (more likely to match resizing cursor), could be adjusted depending
// on where the mouse cursor is and/or relative weights.
// [Part 6] Redistribute stretch remainder width due to rounding (remainder width is < 1.0f * number of Stretch column).
// Using right-to-left distribution (more likely to match resizing cursor).
if (width_remaining_for_stretched_columns >= 1.0f && !(table->Flags & ImGuiTableFlags_PreciseWidths))
for (int order_n = table->ColumnsCount - 1; sum_weights_stretched > 0.0f && width_remaining_for_stretched_columns >= 1.0f && order_n >= 0; order_n--)
{
@ -809,15 +798,15 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
width_remaining_for_stretched_columns -= 1.0f;
}
// Detect hovered column
table->HoveredColumnBody = -1;
table->HoveredColumnBorder = -1;
const ImRect mouse_hit_rect(table->OuterRect.Min.x, table->OuterRect.Min.y, table->OuterRect.Max.x, ImMax(table->OuterRect.Max.y, table->OuterRect.Min.y + table->LastOuterHeight));
const bool is_hovering_table = ItemHoverable(mouse_hit_rect, 0);
// Setup final position, offset and clipping rectangles
// [Part 7] Setup final position, offset, skip/clip states and clipping rectangles, detect hovered column
// Process columns in their visible orders as we are comparing the visible order and adjusting host_clip_rect while looping.
int visible_n = 0;
float offset_x = (table->FreezeColumnsCount > 0) ? table->OuterRect.Min.x : work_rect.Min.x;
offset_x += table->OuterPaddingX;
offset_x -= table->CellSpacingX1;
float offset_x = ((table->FreezeColumnsCount > 0) ? table->OuterRect.Min.x : work_rect.Min.x) + table->OuterPaddingX - table->CellSpacingX1;
ImRect host_clip_rect = table->InnerClipRect;
//host_clip_rect.Max.x += table->CellPaddingX + table->CellSpacingX2;
for (int order_n = 0; order_n < table->ColumnsCount; order_n++)
@ -925,7 +914,9 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
visible_n++;
}
// Detect/store when we are hovering the unused space after the right-most column (so e.g. context menus can react on it)
// [Part 8] Detect/store when we are hovering the unused space after the right-most column (so e.g. context menus can react on it)
// Clear Resizable flag if none of our column are actually resizable (either via an explicit _NoResize flag, either
// because of using _WidthAutoResize/_WidthStretch). This will hide the resizing option from the context menu.
if (is_hovering_table && table->HoveredColumnBody == -1)
{
float unused_x1 = table->WorkRect.Min.x;
@ -934,26 +925,20 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
if (g.IO.MousePos.x >= unused_x1)
table->HoveredColumnBody = (ImGuiTableColumnIdx)table->ColumnsCount;
}
// Clear Resizable flag if none of our column are actually resizable (either via an explicit _NoResize flag,
// either because of using _WidthAutoResize/_WidthStretch).
// This will hide the resizing option from the context menu.
if (count_resizable == 0 && (table->Flags & ImGuiTableFlags_Resizable))
table->Flags &= ~ImGuiTableFlags_Resizable;
// Allocate draw channels
// [Part 9] Allocate draw channels
TableSetupDrawChannels(table);
// Borders
// [Part 10] Hit testing on borders
if (table->Flags & ImGuiTableFlags_Resizable)
TableUpdateBorders(table);
// Reset fields after we used them in TableSetupResize()
table->LastFirstRowHeight = 0.0f;
table->IsLayoutLocked = true;
table->IsUsingHeaders = false;
// Context menu
// [Part 11] Context menu
if (table->IsContextPopupOpen && table->InstanceCurrent == table->InstanceInteracted)
{
const ImGuiID context_menu_id = ImHashStr("##ContextMenu", 0, table->ID);
@ -968,20 +953,20 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
}
}
// [Part 13] Sanitize and build sort specs before we have a change to use them for display.
// This path will only be exercised when sort specs are modified before header rows (e.g. init or visibility change)
if (table->IsSortSpecsDirty && (table->Flags & ImGuiTableFlags_Sortable))
TableSortSpecsBuild(table);
// Initial state
ImGuiWindow* inner_window = table->InnerWindow;
if (table->Flags & ImGuiTableFlags_NoClip)
table->DrawSplitter.SetCurrentChannel(inner_window->DrawList, TABLE_DRAW_CHANNEL_UNCLIPPED);
else
inner_window->DrawList->PushClipRect(inner_window->ClipRect.Min, inner_window->ClipRect.Max, false);
// Sanitize and build sort specs before we have a change to use them for display.
// This path will only be exercised when sort specs are modified before header rows (e.g. init or visibility change)
if (table->IsSortSpecsDirty && (table->Flags & ImGuiTableFlags_Sortable))
TableSortSpecsBuild(table);
}
// Process interaction on resizing borders. Actual size change will be applied in EndTable()
// Process hit-testing on resizing borders. Actual size change will be applied in EndTable()
// - Set table->HoveredColumnBorder with a short delay/timer to reduce feedback noise
// - Submit ahead of table contents and header, use ImGuiButtonFlags_AllowItemOverlap to prioritize widgets
// overlapping the same area.
@ -3110,7 +3095,7 @@ void ImGui::DebugNodeTable(ImGuiTable* table)
char buf[512];
char* p = buf;
const char* buf_end = buf + IM_ARRAYSIZE(buf);
const bool is_active = (table->LastFrameActive >= ImGui::GetFrameCount() - 2);
const bool is_active = (table->LastFrameActive >= ImGui::GetFrameCount() - 2); // Note that fully clipped early out scrolling tables will appear as inactive here.
ImFormatString(p, buf_end - p, "Table 0x%08X (%d columns, in '%s')%s", table->ID, table->ColumnsCount, table->OuterWindow->Name, is_active ? "" : " *Inactive*");
if (!is_active) { PushStyleColor(ImGuiCol_Text, GetStyleColorVec4(ImGuiCol_TextDisabled)); }
bool open = TreeNode(table, "%s", buf);