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Tables: decent support for auto-resize of stretch columns (trickier than it sounds) 

Four cases:
1. visible columns are all stretch, resize all : "size all to default" reset to default weight
2. visible columns are all stretch, resize one: "size one to fit" set weight, reapply weight (todo: improve weight redistribution in case of >1 siblings)
3. visible columns are mixed, resize all: "size all to fit/default" reset stretchs to default weight, set fixed to auto width
4. visible columns are mixed, resize one: "size one to fit", redistribute weight the same way as a manual resize
+ TableSetupColumn() more consistently clear AutoFitQueue.
+ zero-clear RowCellData buffer.
This commit is contained in:
ocornut 2020-11-16 20:25:35 +01:00
parent c5dcf2fde1
commit 3b3503e60f
3 changed files with 85 additions and 50 deletions
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4
imgui_demo.cpp
View File

@ -3514,7 +3514,7 @@ static void ShowDemoWindowTables()
{
// By default, if we don't enable ScrollX the sizing policy for each columns is "Stretch"
// Each columns maintain a sizing weight, and they will occupy all available width.
static ImGuiTableFlags flags = ImGuiTableFlags_Resizable | ImGuiTableFlags_BordersOuter | ImGuiTableFlags_BordersV;
static ImGuiTableFlags flags = ImGuiTableFlags_Resizable | ImGuiTableFlags_BordersOuter | ImGuiTableFlags_BordersV | ImGuiTableFlags_ContextMenuInBody;
PushStyleCompact();
ImGui::CheckboxFlags("ImGuiTableFlags_Resizable", &flags, ImGuiTableFlags_Resizable);
ImGui::CheckboxFlags("ImGuiTableFlags_BordersV", &flags, ImGuiTableFlags_BordersV);
@ -3549,7 +3549,7 @@ static void ShowDemoWindowTables()
"Using _Resizable + _SizingPolicyFixedX flags.\n"
"Fixed-width columns generally makes more sense if you want to use horizontal scrolling.\n\n"
"Double-click a column border to auto-fit the column to its contents.");
static ImGuiTableFlags flags = ImGuiTableFlags_Resizable | ImGuiTableFlags_SizingPolicyFixedX | ImGuiTableFlags_BordersOuter | ImGuiTableFlags_BordersV;
static ImGuiTableFlags flags = ImGuiTableFlags_Resizable | ImGuiTableFlags_SizingPolicyFixedX | ImGuiTableFlags_BordersOuter | ImGuiTableFlags_BordersV | ImGuiTableFlags_ContextMenuInBody;
//ImGui::CheckboxFlags("ImGuiTableFlags_ScrollX", &flags, ImGuiTableFlags_ScrollX); // FIXME-TABLE: Explain or fix the effect of enable Scroll on outer_size
if (ImGui::BeginTable("##table1", 3, flags))
{

9
imgui_internal.h
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@ -519,6 +519,7 @@ struct ImSpan
inline void set(T* data, int size) { Data = data; DataEnd = data + size; }
inline void set(T* data, T* data_end) { Data = data; DataEnd = data_end; }
inline int size() const { return (int)(ptrdiff_t)(DataEnd - Data); }
inline int size_in_bytes() const { return (int)(ptrdiff_t)(DataEnd - Data) * (int)sizeof(T); }
inline T& operator[](int i) { T* p = Data + i; IM_ASSERT(p >= Data && p < DataEnd); return *p; }
inline const T& operator[](int i) const { const T* p = Data + i; IM_ASSERT(p >= Data && p < DataEnd); return *p; }
@ -1941,7 +1942,6 @@ struct ImGuiTableColumn
PrevVisibleColumn = NextVisibleColumn = -1;
SortOrder = -1;
SortDirection = ImGuiSortDirection_None;
AutoFitQueue = CannotSkipItemsQueue = (1 << 3) - 1; // Skip for three frames
DrawChannelCurrent = DrawChannelFrozen = DrawChannelUnfrozen = (ImU8)-1;
}
};
@ -1969,7 +1969,6 @@ struct ImGuiTable
int SettingsOffset; // Offset in g.SettingsTables
int LastFrameActive;
int ColumnsCount; // Number of columns declared in BeginTable()
int ColumnsVisibleCount; // Number of non-hidden columns (<= ColumnsCount)
int CurrentRow;
int CurrentColumn;
ImS16 InstanceCurrent; // Count of BeginTable() calls with same ID in the same frame (generally 0). This is a little bit similar to BeginCount for a window, but multiple table with same ID look are multiple tables, they are just synched.
@ -2018,9 +2017,12 @@ struct ImGuiTable
ImVector<ImGuiTableSortSpecsColumn> SortSpecsData; // FIXME-OPT: Fixed-size array / small-vector pattern, optimize for single sort spec
ImGuiTableSortSpecs SortSpecs; // Public facing sorts specs, this is what we return in TableGetSortSpecs()
ImS8 SortSpecsCount;
ImS8 ColumnsVisibleCount; // Number of non-hidden columns (<= ColumnsCount)
ImS8 ColumnsVisibleFixedCount; // Number of non-hidden columns (<= ColumnsCount)
ImS8 DeclColumnsCount; // Count calls to TableSetupColumn()
ImS8 HoveredColumnBody; // Index of column whose visible region is being hovered. Important: == ColumnsCount when hovering empty region after the right-most column!
ImS8 HoveredColumnBorder; // Index of column whose right-border is being hovered (for resizing).
ImS8 AutoFitSingleStretchColumn; // Index of single stretch column requesting auto-fit.
ImS8 ResizedColumn; // Index of column being resized. Reset when InstanceCurrent==0.
ImS8 LastResizedColumn; // Index of column being resized from previous frame.
ImS8 HeldHeaderColumn; // Index of column header being held.
@ -2287,7 +2289,8 @@ namespace ImGui
IMGUI_API ImRect TableGetCellBgRect(const ImGuiTable* table, int column_n);
IMGUI_API const char* TableGetColumnName(const ImGuiTable* table, int column_n);
IMGUI_API ImGuiID TableGetColumnResizeID(const ImGuiTable* table, int column_n, int instance_no = 0);
IMGUI_API void TableSetColumnAutofit(ImGuiTable* table, int column_n);
IMGUI_API void TableSetColumnWidthAutoSingle(ImGuiTable* table, int column_n);
IMGUI_API void TableSetColumnWidthAutoAll(ImGuiTable* table);
IMGUI_API void PushTableBackground();
IMGUI_API void PopTableBackground();
IMGUI_API void TableRemove(ImGuiTable* table);

122
imgui_tables.cpp
View File

@ -155,6 +155,7 @@ ImGuiTable::ImGuiTable()
ContextPopupColumn = -1;
ReorderColumn = -1;
ResizedColumn = -1;
AutoFitSingleStretchColumn = -1;
HoveredColumnBody = HoveredColumnBorder = -1;
}
@ -216,10 +217,13 @@ static void TableBeginInitMemory(ImGuiTable* table, int columns_count)
span_allocator.GetSpan(1, &table->DisplayOrderToIndex);
span_allocator.GetSpan(2, &table->RowCellData);
memset(table->RowCellData.Data, 0, table->RowCellData.size_in_bytes());
for (int n = 0; n < columns_count; n++)
{
table->Columns[n] = ImGuiTableColumn();
table->Columns[n].DisplayOrder = table->DisplayOrderToIndex[n] = (ImS8)n;
ImGuiTableColumn* column = &table->Columns[n];
*column = ImGuiTableColumn();
column->DisplayOrder = table->DisplayOrderToIndex[n] = (ImS8)n;
column->AutoFitQueue = column->CannotSkipItemsQueue = (1 << 3) - 1; // Fit for three frames
}
}
@ -440,6 +444,15 @@ void ImGui::TableBeginUpdateColumns(ImGuiTable* table)
table->LastResizedColumn = table->ResizedColumn;
table->ResizedColumnNextWidth = FLT_MAX;
table->ResizedColumn = -1;
// Process auto-fit for single stretch column, which is a special case
// FIXME-TABLE: Would be nice to redistribute available stretch space accordingly to other weights, instead of giving it all to siblings.
if (table->AutoFitSingleStretchColumn != -1)
{
table->Columns[table->AutoFitSingleStretchColumn].AutoFitQueue = 0x00;
TableSetColumnWidth(table->AutoFitSingleStretchColumn, table->Columns[table->AutoFitSingleStretchColumn].WidthAuto);
table->AutoFitSingleStretchColumn = -1;
}
}
// Handle reordering request
@ -486,7 +499,7 @@ void ImGui::TableBeginUpdateColumns(ImGuiTable* table)
table->IsSettingsDirty = true;
}
// Setup and lock Visible state and order
// Lock Visible state and Order
table->ColumnsVisibleCount = 0;
table->IsDefaultDisplayOrder = true;
ImGuiTableColumn* last_visible_column = NULL;
@ -522,7 +535,7 @@ void ImGui::TableBeginUpdateColumns(ImGuiTable* table)
last_visible_column->NextVisibleColumn = (ImS8)column_n;
column->PrevVisibleColumn = (ImS8)table->Columns.index_from_ptr(last_visible_column);
}
column->IndexWithinVisibleSet = (ImS8)table->ColumnsVisibleCount;
column->IndexWithinVisibleSet = table->ColumnsVisibleCount;
table->ColumnsVisibleCount++;
table->VisibleMaskByIndex |= index_mask;
table->VisibleMaskByDisplayOrder |= display_order_mask;
@ -658,6 +671,7 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
if (column->Flags & (ImGuiTableColumnFlags_WidthAlwaysAutoResize | ImGuiTableColumnFlags_WidthFixed))
{
// Process auto-fit for non-stretched columns
// Latch initial size for fixed columns and update it constantly for auto-resizing column (unless clipped!)
if ((column->AutoFitQueue != 0x00) || ((column->Flags & ImGuiTableColumnFlags_WidthAlwaysAutoResize) && !column->IsClipped))
column->WidthRequest = width_auto;
@ -676,15 +690,16 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
else
{
IM_ASSERT(column->Flags & ImGuiTableColumnFlags_WidthStretch);
const int init_size = (column->StretchWeight < 0.0f);
if (init_size)
column->StretchWeight = 1.0f;
const float default_weight = (column->InitStretchWeightOrWidth > 0.0f) ? column->InitStretchWeightOrWidth : 1.0f;
if (column->AutoFitQueue != 0x00)
column->StretchWeight = default_weight;
sum_weights_stretched += column->StretchWeight;
if (table->LeftMostStretchedColumnDisplayOrder == -1)
table->LeftMostStretchedColumnDisplayOrder = (ImS8)column->DisplayOrder;
}
sum_width_fixed_requests += table->CellPaddingX * 2.0f;
}
table->ColumnsVisibleFixedCount = (ImS8)count_fixed;
// Layout
const float width_spacings = (table->OuterPaddingX * 2.0f) + (table->CellSpacingX1 + table->CellSpacingX2) * (table->ColumnsVisibleCount - 1);
@ -963,10 +978,9 @@ void ImGui::TableUpdateBorders(ImGuiTable* table)
bool hovered = false, held = false;
bool pressed = ButtonBehavior(hit_rect, column_id, &hovered, &held, ImGuiButtonFlags_FlattenChildren | ImGuiButtonFlags_AllowItemOverlap | ImGuiButtonFlags_PressedOnClick | ImGuiButtonFlags_PressedOnDoubleClick);
if (pressed && IsMouseDoubleClicked(0) && !(column->Flags & ImGuiTableColumnFlags_WidthStretch))
if (pressed && IsMouseDoubleClicked(0))
{
// FIXME-TABLE: Double-clicking on column edge could auto-fit Stretch column?
TableSetColumnAutofit(table, column_n);
TableSetColumnWidthAutoSingle(table, column_n);
ClearActiveID();
held = hovered = false;
}
@ -1313,21 +1327,28 @@ void ImGui::TableSetColumnWidth(int column_n, float width)
}
else if (column_0->Flags & ImGuiTableColumnFlags_WidthStretch)
{
// [Resize Rule 2]
if (column_1 && (column_1->Flags & ImGuiTableColumnFlags_WidthFixed))
// We can also use previous column if there's no next one
if (column_1 == NULL)
column_1 = (column_0->PrevVisibleColumn != -1) ? &table->Columns[column_0->PrevVisibleColumn] : NULL;
if (column_1 == NULL)
return;
if (column_1->Flags & ImGuiTableColumnFlags_WidthFixed)
{
// [Resize Rule 2]
float off = (column_0->WidthGiven - column_0_width);
float column_1_width = column_1->WidthGiven + off;
column_1->WidthRequest = ImMax(min_width, column_1_width);
return;
}
// (old_a + old_b == new_a + new_b) --> (new_a == old_a + old_b - new_b)
float column_1_width = ImMax(column_1->WidthRequest - (column_0_width - column_0->WidthRequest), min_width);
column_0_width = column_0->WidthRequest + column_1->WidthRequest - column_1_width;
column_1->WidthRequest = column_1_width;
column_0->WidthRequest = column_0_width;
TableUpdateColumnsWeightFromWidth(table);
else
{
// (old_a + old_b == new_a + new_b) --> (new_a == old_a + old_b - new_b)
float column_1_width = ImMax(column_1->WidthRequest - (column_0_width - column_0->WidthRequest), min_width);
column_0_width = column_0->WidthRequest + column_1->WidthRequest - column_1_width;
column_1->WidthRequest = column_1_width;
column_0->WidthRequest = column_0_width;
TableUpdateColumnsWeightFromWidth(table);
}
}
}
@ -1613,25 +1634,19 @@ void ImGui::TableSetupColumn(const char* label, ImGuiTableColumnFlags flags,
// Initialize defaults
if (flags & ImGuiTableColumnFlags_WidthStretch)
{
IM_ASSERT(init_width_or_weight != 0.0f && "Need to provide a valid weight!");
if (init_width_or_weight < 0.0f)
init_width_or_weight = 1.0f;
}
column->InitStretchWeightOrWidth = init_width_or_weight;
if (table->IsInitializing && column->WidthRequest < 0.0f && column->StretchWeight < 0.0f)
{
// Init width or weight
if ((flags & ImGuiTableColumnFlags_WidthFixed) && init_width_or_weight > 0.0f)
{
// Disable auto-fit if a default fixed width has been specified
column->WidthRequest = init_width_or_weight;
column->AutoFitQueue = 0x00;
}
if (flags & ImGuiTableColumnFlags_WidthStretch)
column->StretchWeight = init_width_or_weight;
else
column->StretchWeight = 1.0f;
column->StretchWeight = (init_width_or_weight > 0.0f) ? init_width_or_weight : 1.0f;
// Disable auto-fit if an explicit fixed width has been specified
if (init_width_or_weight > 0.0f)
column->AutoFitQueue = 0x00;
}
if (table->IsInitializing)
{
@ -2041,13 +2056,30 @@ ImGuiID ImGui::TableGetColumnResizeID(const ImGuiTable* table, int column_n, int
return id;
}
void ImGui::TableSetColumnAutofit(ImGuiTable* table, int column_n)
// Disable clipping then auto-fit, will take 2 frames
// (we don't take a shortcut for unclipped columns to reduce inconsistencies when e.g. resizing multiple columns)
void ImGui::TableSetColumnWidthAutoSingle(ImGuiTable* table, int column_n)
{
// Disable clipping then auto-fit, will take 2 frames
// (we don't take a shortcut for unclipped columns to reduce inconsistencies when e.g. resizing multiple columns)
// Single auto width uses auto-fit
ImGuiTableColumn* column = &table->Columns[column_n];
if (!column->IsVisible)
return;
column->CannotSkipItemsQueue = (1 << 0);
column->AutoFitQueue = (1 << 1);
if (column->Flags & ImGuiTableColumnFlags_WidthStretch)
table->AutoFitSingleStretchColumn = (ImS8)column_n;
}
void ImGui::TableSetColumnWidthAutoAll(ImGuiTable* table)
{
for (int column_n = 0; column_n < table->ColumnsCount; column_n++)
{
ImGuiTableColumn* column = &table->Columns[column_n];
if (!column->IsVisible)
continue;
column->CannotSkipItemsQueue = (1 << 0);
column->AutoFitQueue = (1 << 1);
}
}
void ImGui::PushTableBackground()
@ -2092,20 +2124,20 @@ void ImGui::TableDrawContextMenu(ImGuiTable* table)
{
if (column != NULL)
{
const bool can_resize = !(column->Flags & (ImGuiTableColumnFlags_NoResize | ImGuiTableColumnFlags_WidthStretch)) && column->IsVisible;
const bool can_resize = !(column->Flags & ImGuiTableColumnFlags_NoResize) && column->IsVisible;
if (MenuItem("Size column to fit", NULL, false, can_resize))
TableSetColumnAutofit(table, column_n);
TableSetColumnWidthAutoSingle(table, column_n);
}
if (MenuItem("Size all columns to fit", NULL))
{
for (int other_column_n = 0; other_column_n < table->ColumnsCount; other_column_n++)
{
ImGuiTableColumn* other_column = &table->Columns[other_column_n];
if (other_column->IsVisible)
TableSetColumnAutofit(table, other_column_n);
}
}
const char* size_all_desc;
if (table->ColumnsVisibleFixedCount == table->ColumnsVisibleCount)
size_all_desc = "Size all columns to fit"; // All fixed
else if (table->ColumnsVisibleFixedCount == 0)
size_all_desc = "Size all columns to default"; // All stretch
else
size_all_desc = "Size all columns to fit/default"; // Mixed
if (MenuItem(size_all_desc, NULL))
TableSetColumnWidthAutoAll(table);
want_separator = true;
}