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Tables: extracted code for TableGetMaxColumnWidth(), fixing "stuck" resize being lossy as it used an older calculation for it and didn't honor e.g. _NoKeepColumnsVisible

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docking
ocornut 4 years ago
parent 1aa59f90d0
commit 972ca8166f
3 changed files with 45 additions and 38 deletions
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2
imgui.h
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@ -1079,7 +1079,7 @@ enum ImGuiTableFlags_
ImGuiTableFlags_ColumnsWidthFixed = 1 << 14, // Default if ScrollX is on. Columns will default to use _WidthFixed or _WidthAutoResize policy (if Resizable is off). Read description above for more details.
ImGuiTableFlags_SameWidths = 1 << 15, // Make all columns the same widths which is useful with Fixed columns policy (but granted by default with Stretch policy + no resize). Implicitly enable ImGuiTableFlags_NoKeepColumnsVisible and disable ImGuiTableFlags_Resizable.
ImGuiTableFlags_NoHostExtendY = 1 << 16, // Disable extending table past the limit set by outer_size.y. Only meaningful when neither ScrollX nor ScrollY are set (data below the limit will be clipped and not visible)
ImGuiTableFlags_NoKeepColumnsVisible = 1 << 17, // Disable keeping column always minimally visible when ScrollX is off and table gets too small.
ImGuiTableFlags_NoKeepColumnsVisible = 1 << 17, // Disable keeping column always minimally visible when ScrollX is off and table gets too small. Not recommended if columns are resizable.
ImGuiTableFlags_PreciseWidths = 1 << 18, // Disable distributing remainder width to stretched columns (width allocation on a 100-wide table with 3 columns: Without this flag: 33,33,34. With this flag: 33,33,33). With larger number of columns, resizing will appear to be less smooth.
// Clipping
ImGuiTableFlags_NoClip = 1 << 19, // Disable clipping rectangle for every individual columns (reduce draw command count, items will be able to overflow into other columns). Generally incompatible with TableSetupScrollFreeze().

1
imgui_internal.h
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@ -2325,6 +2325,7 @@ namespace ImGui
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 float TableGetMinColumnWidth();
IMGUI_API float TableGetMaxColumnWidth(const ImGuiTable* table, int column_n);
IMGUI_API void TableSetColumnWidthAutoSingle(ImGuiTable* table, int column_n);
IMGUI_API void TableSetColumnWidthAutoAll(ImGuiTable* table);
IMGUI_API void TableRemove(ImGuiTable* table);

80
imgui_tables.cpp
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@ -703,7 +703,6 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
// [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; // 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.
@ -895,42 +894,20 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
if (is_hovering_table && g.IO.MousePos.x >= column->ClipRect.Min.x && g.IO.MousePos.x < column->ClipRect.Max.x)
table->HoveredColumnBody = (ImGuiTableColumnIdx)column_n;
// Maximum width
float max_width = FLT_MAX;
if (table->Flags & ImGuiTableFlags_ScrollX)
{
// Frozen columns can't reach beyond visible width else scrolling will naturally break.
if (order_n < table->FreezeColumnsRequest)
{
max_width = (table->InnerClipRect.Max.x - (table->FreezeColumnsRequest - order_n) * min_column_distance) - offset_x;
max_width = max_width - table->OuterPaddingX - table->CellPaddingX - table->CellSpacingX2;
}
}
else if ((table->Flags & ImGuiTableFlags_NoKeepColumnsVisible) == 0)
{
// If horizontal scrolling if disabled, we apply a final lossless shrinking of columns in order to make
// sure they are all visible. Because of this we also know that all of the columns will always fit in
// table->WorkRect and therefore in table->InnerRect (because ScrollX is off)
// FIXME-TABLE: This is solved incorrectly but also quite a difficult problem to fix as we also want ClipRect width to match.
// See "table_width_distrib" and "table_width_keep_visible" tests
max_width = table->WorkRect.Max.x - (table->ColumnsEnabledCount - column->IndexWithinEnabledSet - 1) * min_column_distance - offset_x;
//max_width -= table->CellSpacingX1;
max_width -= table->CellSpacingX2;
max_width -= table->CellPaddingX * 2.0f;
max_width -= table->OuterPaddingX;
}
column->WidthGiven = ImMin(column->WidthGiven, max_width);
// Lock start position
column->MinX = offset_x;
// Minimum width
// Lock width based on start position and minimum/maximum width for this position
float max_width = TableGetMaxColumnWidth(table, column_n);
column->WidthGiven = ImMin(column->WidthGiven, max_width);
column->WidthGiven = ImMax(column->WidthGiven, ImMin(column->WidthRequest, min_column_width));
column->MaxX = offset_x + column->WidthGiven + table->CellSpacingX1 + table->CellSpacingX2 + table->CellPaddingX * 2.0f;
// Lock all our positions
// Lock other positions
// - ClipRect.Min.x: Because merging draw commands doesn't compare min boundaries, we make ClipRect.Min.x match left bounds to be consistent regardless of merging.
// - ClipRect.Max.x: using WorkMaxX instead of MaxX (aka including padding) makes things more consistent when resizing down, tho slightly detrimental to visibility in very-small column.
// - ClipRect.Max.x: using MaxX makes it easier for header to receive hover highlight with no discontinuity and display sorting arrow.
// - FIXME-TABLE: We want equal width columns to have equal (ClipRect.Max.x - WorkMinX) width, which means ClipRect.max.x cannot stray off host_clip_rect.Max.x else right-most column may appear shorter.
column->MinX = offset_x;
column->MaxX = offset_x + column->WidthGiven + table->CellSpacingX1 + table->CellSpacingX2 + table->CellPaddingX * 2.0f;
column->WorkMinX = column->MinX + table->CellPaddingX + table->CellSpacingX1;
column->WorkMaxX = column->MaxX - table->CellPaddingX - table->CellSpacingX2; // Expected max
column->ItemWidth = ImFloor(column->WidthGiven * 0.65f);
@ -1835,6 +1812,7 @@ void ImGui::TableEndCell(ImGuiTable* table)
// [SECTION] Tables: Columns width management
//-------------------------------------------------------------------------
// - TableGetMinColumnWidth() [Internal]
// - TableGetMaxColumnWidth() [Internal]
// - TableSetColumnWidth()
// - TableSetColumnWidthAutoSingle() [Internal]
// - TableSetColumnWidthAutoAll() [Internal]
@ -1849,6 +1827,37 @@ float ImGui::TableGetMinColumnWidth()
return g.Style.FramePadding.x * 1.0f;
}
// Maximum column content width given current layout. Use column->MinX so this value on a per-column basis.
float ImGui::TableGetMaxColumnWidth(const ImGuiTable* table, int column_n)
{
const ImGuiTableColumn* column = &table->Columns[column_n];
float max_width = FLT_MAX;
const float min_column_distance = TableGetMinColumnWidth() + table->CellPaddingX * 2.0f + table->CellSpacingX1 + table->CellSpacingX2;
if (table->Flags & ImGuiTableFlags_ScrollX)
{
// Frozen columns can't reach beyond visible width else scrolling will naturally break.
if (column->DisplayOrder < table->FreezeColumnsRequest)
{
max_width = (table->InnerClipRect.Max.x - (table->FreezeColumnsRequest - column->DisplayOrder) * min_column_distance) - column->MinX;
max_width = max_width - table->OuterPaddingX - table->CellPaddingX - table->CellSpacingX2;
}
}
else if ((table->Flags & ImGuiTableFlags_NoKeepColumnsVisible) == 0)
{
// If horizontal scrolling if disabled, we apply a final lossless shrinking of columns in order to make
// sure they are all visible. Because of this we also know that all of the columns will always fit in
// table->WorkRect and therefore in table->InnerRect (because ScrollX is off)
// FIXME-TABLE: This is solved incorrectly but also quite a difficult problem to fix as we also want ClipRect width to match.
// See "table_width_distrib" and "table_width_keep_visible" tests
max_width = table->WorkRect.Max.x - (table->ColumnsEnabledCount - column->IndexWithinEnabledSet - 1) * min_column_distance - column->MinX;
//max_width -= table->CellSpacingX1;
max_width -= table->CellSpacingX2;
max_width -= table->CellPaddingX * 2.0f;
max_width -= table->OuterPaddingX;
}
return max_width;
}
// 'width' = inner column width, without padding
void ImGui::TableSetColumnWidth(int column_n, float width)
{
@ -1859,14 +1868,11 @@ void ImGui::TableSetColumnWidth(int column_n, float width)
ImGuiTableColumn* column_0 = &table->Columns[column_n];
float column_0_width = width;
// Constraints
const float min_width = TableGetMinColumnWidth();
float max_width_0 = FLT_MAX;
if (!(table->Flags & ImGuiTableFlags_ScrollX))
max_width_0 = (table->WorkRect.Max.x - column_0->MinX) - (table->ColumnsEnabledCount - (column_0->IndexWithinEnabledSet + 1)) * min_width;
column_0_width = ImClamp(column_0_width, min_width, max_width_0);
// Apply constraints early
// Compare both requested and actual given width to avoid overwriting requested width when column is stuck (minimum size, bounded)
const float min_width = TableGetMinColumnWidth();
const float max_width = TableGetMaxColumnWidth(table, column_n);
column_0_width = ImClamp(column_0_width, min_width, max_width);
if (column_0->WidthGiven == column_0_width || column_0->WidthRequest == column_0_width)
return;

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