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Tables: Clarify internal calculations of row height so that TableGetCellRect() include expected paddings. Add demo code. Comments.

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Remove misleading commented-out flags for now.
This commit is contained in:
omar 2020-01-03 00:31:06 +01:00 committed by ocornut
parent 325b4c69ba
commit 416e9bb38d
3 changed files with 33 additions and 12 deletions
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4
imgui.h
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@ -1081,10 +1081,6 @@ enum ImGuiTableColumnFlags_
// [Internal] Combinations and masks
ImGuiTableColumnFlags_WidthMask_ = ImGuiTableColumnFlags_WidthFixed | ImGuiTableColumnFlags_WidthStretch | ImGuiTableColumnFlags_WidthAlwaysAutoResize,
ImGuiTableColumnFlags_NoDirectResize_ = 1 << 20 // [Internal] Disable user resizing this column directly (it may however we resized indirectly from its left edge)
//ImGuiTableColumnFlags_AlignLeft = 1 << 14,
//ImGuiTableColumnFlags_AlignCenter = 1 << 15,
//ImGuiTableColumnFlags_AlignRight = 1 << 16,
//ImGuiTableColumnFlags_AlignMask_ = ImGuiTableColumnFlags_AlignLeft | ImGuiTableColumnFlags_AlignCenter | ImGuiTableColumnFlags_AlignRight
};
// Flags for ImGui::TableNextRow()

21
imgui_demo.cpp
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@ -3842,6 +3842,27 @@ static void ShowDemoWindowTables()
ImGui::TreePop();
}
if (open_action != -1)
ImGui::SetNextItemOpen(open_action != 0);
if (ImGui::TreeNode("Row height"))
{
HelpMarker("You can pass a 'min_row_height' to TableNextRow().\n\nRows are padded with 'style.CellPadding.y' on top and bottom, so effectively the minimum row height will always be >= 'style.CellPadding.y * 2.0f'.\n\nWe cannot honor a _maximum_ row height as that would requires a unique clipping rectangle per row.");
if (ImGui::BeginTable("##2ways", 2, ImGuiTableFlags_Borders))
{
float min_row_height = ImGui::GetFontSize() + ImGui::GetStyle().CellPadding.y * 2.0f;
ImGui::TableNextRow(ImGuiTableRowFlags_None, min_row_height);
ImGui::Text("min_row_height = %.2f", min_row_height);
for (int row = 0; row < 10; row++)
{
min_row_height = (float)(int)(ImGui::GetFontSize() * 0.30f * row);
ImGui::TableNextRow(ImGuiTableRowFlags_None, min_row_height);
ImGui::Text("min_row_height = %.2f", min_row_height);
}
ImGui::EndTable();
}
ImGui::TreePop();
}
static const char* template_items_names[] =
{
"Banana", "Apple", "Cherry", "Watermelon", "Grapefruit", "Strawberry", "Mango",

20
imgui_tables.cpp
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@ -724,9 +724,9 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
// FIXME-TABLE: This align based on the whole column width, not per-cell, and therefore isn't useful in many cases.
// (To be able to honor this we might be able to store a log of cells width, per row, for visible rows, but nav/programmatic scroll would have visible artifacts.)
//if (column->Flags & ImGuiTableColumnFlags_AlignRight)
// column->StartXRows = ImMax(column->StartXRows, column->MaxX - column->WidthContent[0]);
// column->StartXRows = ImMax(column->StartXRows, column->MaxX - column->ContentWidthRowsUnfrozen);
//else if (column->Flags & ImGuiTableColumnFlags_AlignCenter)
// column->StartXRows = ImLerp(column->StartXRows, ImMax(column->StartXRows, column->MaxX - column->WidthContent[0]), 0.5f);
// column->StartXRows = ImLerp(column->StartXRows, ImMax(column->StartXRows, column->MaxX - column->ContentWidthRowsUnfrozen), 0.5f);
// Reset content width variables
const float initial_max_pos_x = column->MinX + table->CellPaddingX1;
@ -1401,8 +1401,10 @@ void ImGui::TableNextRow(ImGuiTableRowFlags row_flags, float min_row_height)
table->RowFlags = row_flags;
TableBeginRow(table);
// We honor min_height requested by user, but cannot guarantee per-row maximum height as that would essentially require a unique clipping rectangle per-cell.
table->RowPosY2 += min_row_height;
// We honor min_row_height requested by user, but cannot guarantee per-row maximum height,
// because that would essentially require a unique clipping rectangle per-cell.
table->RowPosY2 += table->CellPaddingY * 2.0f;
table->RowPosY2 = ImMax(table->RowPosY2, table->RowPosY1 + min_row_height);
TableBeginCell(table, 0);
}
@ -1447,8 +1449,6 @@ void ImGui::TableEndRow(ImGuiTable* table)
TableEndCell(table);
table->RowPosY2 += table->CellPaddingY;
// Position cursor at the bottom of our row so it can be used for e.g. clipping calculation.
// However it is likely that the next call to TableBeginCell() will reposition the cursor to take account of vertical padding.
window->DC.CursorPos.y = table->RowPosY2;
@ -1605,7 +1605,7 @@ void ImGui::TableEndCell(ImGuiTable* table)
else
p_max_pos_x = table->IsFreezeRowsPassed ? &column->ContentMaxPosRowsUnfrozen : &column->ContentMaxPosRowsFrozen;
*p_max_pos_x = ImMax(*p_max_pos_x, window->DC.CursorMaxPos.x);
table->RowPosY2 = ImMax(table->RowPosY2, window->DC.CursorMaxPos.y);
table->RowPosY2 = ImMax(table->RowPosY2, window->DC.CursorMaxPos.y + table->CellPaddingY);
// Propagate text baseline for the entire row
// FIXME-TABLE: Here we propagate text baseline from the last line of the cell.. instead of the first one.
@ -1682,6 +1682,9 @@ bool ImGui::TableSetColumnIndex(int column_idx)
return (table->VisibleMaskByIndex & ((ImU64)1 << column_idx)) != 0;
}
// Return the cell rectangle based on currently known height.
// Important: we generally don't know our row height until the end of the row, so Max.y will be incorrect in many situations.
// The only case where this is correct is if we provided a min_row_height to TableNextRow() and don't go below it.
ImRect ImGui::TableGetCellRect()
{
ImGuiContext& g = *GImGui;
@ -1805,7 +1808,7 @@ void ImGui::TableAutoHeaders()
ImGuiTable* table = g.CurrentTable;
IM_ASSERT(table != NULL && "Need to call TableAutoHeaders() after BeginTable()!");
TableNextRow(ImGuiTableRowFlags_Headers, GetTextLineHeight());
TableNextRow(ImGuiTableRowFlags_Headers, GetTextLineHeight() + g.Style.CellPadding.y * 2.0f);
if (window->SkipItems)
return;
@ -1909,6 +1912,7 @@ void ImGui::TableHeader(const char* label)
float row_height = GetTextLineHeight();
ImRect cell_r = TableGetCellRect();
//GetForegroundDrawList()->AddRect(cell_r.Min, cell_r.Max, IM_COL32(255, 0, 0, 255)); // [DEBUG]
ImRect work_r = cell_r;
work_r.Min.x = window->DC.CursorPos.x;
work_r.Max.y = work_r.Min.y + row_height;