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Tables: comments, tweak. CollapsingHeader: comments. (#3715)

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This commit is contained in:
ocornut 2021-01-12 14:43:48 +01:00
parent feaa7ea003
commit 002ba1a69f
4 changed files with 44 additions and 28 deletions
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2
docs/CHANGELOG.txt
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@ -74,7 +74,7 @@ Other Changes:
TableGetColumnCount(), TableGetColumnName(), TableGetColumnFlags().
- Added 2 structures: ImGuiTableSortSpecs, ImGuiTableColumnSortSpecs.
- Added 2 enums: ImGuiSortDirection, ImGuiTableBgTarget.
- Added 3 flags sets: ImGuiTableFlags (27 flags), ImGuiTableColumnFlags (24 flags), ImGuiTableRowFlags (1 flags).
- Added 3 flags sets: ImGuiTableFlags (27 flags), ImGuiTableColumnFlags (24 flags), ImGuiTableRowFlags (1 flag).
- Added 5 colors: ImGuiCol_TableHeaderBg, ImGuiCol_TableBorderStrong, ImGuiCol_TableBorderLight, ImGuiCol_TableRowBg, ImGuiCol_TableRowBgAlt.
- Added 1 style var: ImGuiStyleVar_CellPadding.
- Tab Bar: Made it possible to append to an existing tab bar by calling BeginTabBar()/EndTabBar() again.

34
imgui.h
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@ -568,7 +568,7 @@ namespace ImGui
IMGUI_API void TreePop(); // ~ Unindent()+PopId()
IMGUI_API float GetTreeNodeToLabelSpacing(); // horizontal distance preceding label when using TreeNode*() or Bullet() == (g.FontSize + style.FramePadding.x*2) for a regular unframed TreeNode
IMGUI_API bool CollapsingHeader(const char* label, ImGuiTreeNodeFlags flags = 0); // if returning 'true' the header is open. doesn't indent nor push on ID stack. user doesn't have to call TreePop().
IMGUI_API bool CollapsingHeader(const char* label, bool* p_open, ImGuiTreeNodeFlags flags = 0); // when 'p_open' isn't NULL, display an additional small close button on upper right of the header
IMGUI_API bool CollapsingHeader(const char* label, bool* p_visible, ImGuiTreeNodeFlags flags = 0); // when 'p_visible != NULL': if '*p_visible==true' display an additional small close button on upper right of the header which will set the bool to false when clicked, if '*p_visible==false' don't display the header.
IMGUI_API void SetNextItemOpen(bool is_open, ImGuiCond cond = 0); // set next TreeNode/CollapsingHeader open state.
// Widgets: Selectables
@ -656,9 +656,10 @@ namespace ImGui
IMGUI_API bool IsPopupOpen(const char* str_id, ImGuiPopupFlags flags = 0); // return true if the popup is open.
// Tables
// [BETA API] API may evolve!
// [BETA API] API may evolve slightly! If you use this, please update to the next version when it comes out!
// - Full-featured replacement for old Columns API.
// - See Demo->Tables for details.
// - See Demo->Tables for demo code.
// - See top of imgui_tables.cpp for general commentary.
// - See ImGuiTableFlags_ and ImGuiTableColumnFlags_ enums for a description of available flags.
// The typical call flow is:
// - 1. Call BeginTable()
@ -671,25 +672,19 @@ namespace ImGui
// 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 true when the column is visible or performing
// width measurements. Otherwise, you may skip submitting the contents of a cell/column, BUT ONLY if you know
// it is not going to contribute to 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() -> 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!
// --------------------------------------------------------------------------------------------------------
// - 5. Call EndTable()
IMGUI_API bool BeginTable(const char* str_id, int columns_count, ImGuiTableFlags flags = 0, const ImVec2& outer_size = ImVec2(-FLT_MIN, 0), float inner_width = 0.0f);
IMGUI_API void EndTable(); // only call EndTable() if BeginTable() returns true!
IMGUI_API void TableNextRow(ImGuiTableRowFlags row_flags = 0, float min_row_height = 0.0f); // append into the first cell of a new row.
IMGUI_API bool TableNextColumn(); // append into the next column (or first column of next row if currently in last column). Return true when column is visible.
IMGUI_API bool TableSetColumnIndex(int column_n); // append into the specified column. Return true when column is visible.
IMGUI_API int TableGetColumnIndex(); // return current column index.
IMGUI_API int TableGetRowIndex(); // return current row index.
// Tables: Headers & Columns declaration
// - Use TableSetupColumn() to specify label, resizing policy, default width/weight, id, various other flags etc.
// Important: this will not display anything! The name passed to TableSetupColumn() is used by TableHeadersRow() and context-menus.
@ -708,10 +703,12 @@ namespace ImGui
// Make sure to set 'SpecsDirty = false' after sorting, else you may wastefully sort your data every frame!
// Lifetime: don't hold on this pointer over multiple frames or past any subsequent call to BeginTable().
IMGUI_API int TableGetColumnCount(); // return number of columns (value passed to BeginTable)
IMGUI_API int TableGetColumnIndex(); // return current column index.
IMGUI_API int TableGetRowIndex(); // return current row index.
IMGUI_API const char* TableGetColumnName(int column_n = -1); // return "" if column didn't have a name declared by TableSetupColumn(). Pass -1 to use current column.
IMGUI_API ImGuiTableColumnFlags TableGetColumnFlags(int column_n = -1); // return column flags so you can query their Enabled/Visible/Sorted/Hovered status flags.
IMGUI_API ImGuiTableColumnFlags TableGetColumnFlags(int column_n = -1); // return column flags so you can query their Enabled/Visible/Sorted/Hovered status flags. Pass -1 to use current column.
IMGUI_API ImGuiTableSortSpecs* TableGetSortSpecs(); // get latest sort specs for the table (NULL if not sorting).
IMGUI_API void TableSetBgColor(ImGuiTableBgTarget bg_target, ImU32 color, int column_n = -1); // change the color of a cell, row, or column. See ImGuiTableBgTarget_ flags for details.
IMGUI_API void TableSetBgColor(ImGuiTableBgTarget target, ImU32 color, int column_n = -1); // change the color of a cell, row, or column. See ImGuiTableBgTarget_ flags for details.
// Legacy Columns API (2020: prefer using Tables!)
// - You can also use SameLine(pos_x) to mimic simplified columns.
@ -1035,6 +1032,7 @@ enum ImGuiTabItemFlags_
};
// Flags for ImGui::BeginTable()
// [BETA API] API may evolve slightly! If you use this, please update to the next version when it comes out!
// - Important! Sizing policies have complex and subtle side effects, more so than you would expect.
// Read comments/demos carefully + experiment with live demos to get acquainted with them.
// - The DEFAULT sizing policies are:
@ -1091,7 +1089,7 @@ enum ImGuiTableFlags_
// 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().
// Padding
ImGuiTableFlags_PadOuterX = 1 << 20, // Default if BordersOuterV is on. Enable outer-most padding.
ImGuiTableFlags_PadOuterX = 1 << 20, // Default if BordersOuterV is on. Enable outer-most padding. Generally desirable if you have headers.
ImGuiTableFlags_NoPadOuterX = 1 << 21, // Default if BordersOuterV is off. Disable outer-most padding.
ImGuiTableFlags_NoPadInnerX = 1 << 22, // Disable inner padding between columns (double inner padding if BordersOuterV is on, single inner padding if BordersOuterV is off).
// Scrolling

22
imgui_tables.cpp
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@ -130,6 +130,16 @@ Index of this file:
// - when using ImGuiTableFlags_SizingFixedSame with mixed columns, only the Fixed/Auto columns will match their widths to the maximum contents width.
// - when using ImGuiTableFlags_SizingStretchSame with mixed columns, only the Stretch columns will match their weight/widths.
//-----------------------------------------------------------------------------
// About using column width:
// If a column is manual resizable or has a width specified with TableSetupColumn():
// - you may use GetContentRegionAvail().x to query the width available in a given column.
// - right-side alignment features such as SetNextItemWidth(-x) or PushItemWidth(-x) will rely on this width.
// If the column is not resizable and has no width specified with TableSetupColumn():
// - its width will be automatic and be the set to the max of items submitted.
// - therefore you generally cannot have ALL items of the columns use e.g. SetNextItemWidth(-FLT_MIN).
// - but if the column has one or more item of known/fixed size, this will become the reference width used by SetNextItemWidth(-FLT_MIN).
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// TABLES CLIPPING/CULLING
@ -143,6 +153,10 @@ Index of this file:
// So, if you want to use the clipper, make sure to either enable _Resizable, either setup columns explicitly with _WidthFixed.
//-----------------------------------------------------------------------------
// About clipping/culling of Columns in Tables:
// - Both TableSetColumnIndex() and TableNextColumn() return true when the column is visible or performing
// width measurements. Otherwise, you may skip submitting the contents of a cell/column, BUT ONLY if you know
// it is not going to contribute to row height.
// In many situations, you may skip submitting contents for every columns but one (e.g. the first one).
// - Case A: column is not hidden by user, and at least partially in sight (most common case).
// - Case B: column is clipped / out of sight (because of scrolling or parent ClipRect): TableNextColumn() return false as a hint but we still allow layout output.
// - Case C: column is hidden explicitly by the user (e.g. via the context menu, or _DefaultHide column flag, etc.).
@ -1455,17 +1469,17 @@ int ImGui::TableGetHoveredColumn()
return (int)table->HoveredColumnBody;
}
void ImGui::TableSetBgColor(ImGuiTableBgTarget bg_target, ImU32 color, int column_n)
void ImGui::TableSetBgColor(ImGuiTableBgTarget target, ImU32 color, int column_n)
{
ImGuiContext& g = *GImGui;
ImGuiTable* table = g.CurrentTable;
IM_ASSERT(bg_target != ImGuiTableBgTarget_None);
IM_ASSERT(target != ImGuiTableBgTarget_None);
if (color == IM_COL32_DISABLE)
color = 0;
// We cannot draw neither the cell or row background immediately as we don't know the row height at this point in time.
switch (bg_target)
switch (target)
{
case ImGuiTableBgTarget_CellBg:
{
@ -1488,7 +1502,7 @@ void ImGui::TableSetBgColor(ImGuiTableBgTarget bg_target, ImU32 color, int colum
if (table->RowPosY1 > table->InnerClipRect.Max.y) // Discard
return;
IM_ASSERT(column_n == -1);
int bg_idx = (bg_target == ImGuiTableBgTarget_RowBg1) ? 1 : 0;
int bg_idx = (target == ImGuiTableBgTarget_RowBg1) ? 1 : 0;
table->RowBgColor[bg_idx] = color;
break;
}

14
imgui_widgets.cpp
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@ -5898,21 +5898,25 @@ bool ImGui::CollapsingHeader(const char* label, ImGuiTreeNodeFlags flags)
return TreeNodeBehavior(window->GetID(label), flags | ImGuiTreeNodeFlags_CollapsingHeader, label);
}
bool ImGui::CollapsingHeader(const char* label, bool* p_open, ImGuiTreeNodeFlags flags)
// p_visible == NULL : regular collapsing header
// p_visible != NULL && *p_visible == true : show a small close button on the corner of the header, clicking the button will set *p_visible = false
// p_visible != NULL && *p_visible == false : do not show the header at all
// Do not mistake this with the Open state of the header itself, which you can adjust with SetNextItemOpen() or ImGuiTreeNodeFlags_DefaultOpen.
bool ImGui::CollapsingHeader(const char* label, bool* p_visible, ImGuiTreeNodeFlags flags)
{
ImGuiWindow* window = GetCurrentWindow();
if (window->SkipItems)
return false;
if (p_open && !*p_open)
if (p_visible && !*p_visible)
return false;
ImGuiID id = window->GetID(label);
flags |= ImGuiTreeNodeFlags_CollapsingHeader;
if (p_open)
if (p_visible)
flags |= ImGuiTreeNodeFlags_AllowItemOverlap | ImGuiTreeNodeFlags_ClipLabelForTrailingButton;
bool is_open = TreeNodeBehavior(id, flags, label);
if (p_open != NULL)
if (p_visible != NULL)
{
// Create a small overlapping close button
// FIXME: We can evolve this into user accessible helpers to add extra buttons on title bars, headers, etc.
@ -5924,7 +5928,7 @@ bool ImGui::CollapsingHeader(const char* label, bool* p_open, ImGuiTreeNodeFlags
float button_y = window->DC.LastItemRect.Min.y;
ImGuiID close_button_id = GetIDWithSeed("#CLOSE", NULL, id);
if (CloseButton(close_button_id, ImVec2(button_x, button_y)))
*p_open = false;
*p_visible = false;
last_item_backup.Restore();
}