512 lines
13 KiB
C++
512 lines
13 KiB
C++
/*
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* Copyright (C) 2021 Paul Davis <paul@linuxaudiosystems.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "pbd/debug.h"
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#include "pbd/error.h"
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#include "pbd/i18n.h"
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#include "pbd/unwind.h"
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#include "canvas/debug.h"
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#include "canvas/table.h"
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using namespace ArdourCanvas;
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using namespace PBD;
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using std::cerr;
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using std::endl;
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Table::Table (Canvas* canvas)
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: Rectangle (canvas)
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, collapse_on_hide (false)
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, homogenous (true)
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, draw_hgrid (false)
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, draw_vgrid (false)
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{
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set_layout_sensitive (true);
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}
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Table::Table (Item* item)
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: Rectangle (item)
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, collapse_on_hide (false)
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, homogenous (true)
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, draw_hgrid (false)
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, draw_vgrid (false)
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{
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set_layout_sensitive (true);
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}
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void
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Table::attach (Item* item, Table::Index const & upper_left, Table::Index const & lower_right, PackOptions row_options, PackOptions col_options, FourDimensions pad)
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{
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/* XXX maybe use z-axis to stack elements if the insert fails? Would
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* involve making Index 3D and using an actual hash function
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*/
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if (cells.insert ({ Index (upper_left.x, upper_left.y), CellInfo (item, row_options, col_options, upper_left, lower_right, pad) }).second) {
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_add (item);
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} else {
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cerr << "Failed to attach at " << upper_left.x << ", " << upper_left.y << " " << lower_right.x << ", " << lower_right.y << endl;
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}
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}
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void
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Table::child_changed (bool bbox_changed)
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{
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if (ignore_child_changes) {
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return;
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}
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Item::child_changed (bbox_changed);
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size_allocate_children (_allocation);
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}
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void
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Table::compute_bounding_box() const
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{
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_bounding_box = Rect();
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if (cells.empty()) {
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bb_clean ();
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return;
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}
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add_child_bounding_boxes (!collapse_on_hide);
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if (_bounding_box) {
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#if 0
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Rect r = _bounding_box;
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_bounding_box = r.expand (top_padding + outline_width() + top_margin,
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right_padding + outline_width() + right_margin,
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bottom_padding + outline_width() + bottom_margin,
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left_padding + outline_width() + left_margin);
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#endif
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}
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DEBUG_TRACE (DEBUG::CanvasTable, string_compose ("bounding box computed as %1\n", _bounding_box));
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bb_clean ();
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}
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void
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Table::set_row_size (uint32_t row, Distance size)
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{
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if (row_info.size() <= row) {
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row_info.resize (row+1);
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}
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row_info[row].user_size = size;
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}
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void
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Table::set_col_size (uint32_t col, Distance size)
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{
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if (col_info.size() <= col) {
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col_info.resize (col+1);
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}
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col_info[col].user_size = size;
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}
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void
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Table::size_request (Distance& w, Distance& h) const
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{
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uint32_t rowmax = 0;
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uint32_t colmax = 0;
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for (auto& ci : cells) {
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CellInfo const & c (ci.second);
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if (c.lower_right.x > rowmax) {
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rowmax = c.lower_right.x;
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}
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if (c.lower_right.y > colmax) {
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colmax = c.lower_right.y;
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}
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}
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AxisInfos rinfo;
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AxisInfos cinfo;
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rinfo.resize (rowmax+1);
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cinfo.resize (colmax+1);
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for (auto& ci : cells) {
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Distance cw;
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Distance ch;
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CellInfo const & c (ci.second);
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c.content->size_request (cw, ch);
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rinfo[c.upper_left.x].natural_size += cw;
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cinfo[c.upper_left.y].natural_size += ch;
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}
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w = 0;
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h = 0;
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for (auto& ai : rinfo) {
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w = std::max (w, ai.natural_size);
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}
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for (auto& ai : cinfo) {
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h = std::max (h, ai.natural_size);
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}
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}
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void
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Table::layout ()
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{
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cerr << "\n\nLAYOUT\n\n";
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size_allocate_children (_allocation);
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}
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void
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Table::size_allocate_children (Rect const & within)
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{
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(void) compute (within);
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}
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Duple
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Table::compute (Rect const & within)
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{
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DEBUG_TRACE (DEBUG::CanvasTable, string_compose ("\n\nCompute table within rect: %1\n", within));
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/* step 1: traverse all current cells and determine how many rows and
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* columns we need. While doing that, get the current natural size of
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* each cell.
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*/
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uint32_t rowmax = 0;
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uint32_t colmax = 0;
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row_info.clear ();
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col_info.clear ();
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for (auto& ci : cells) {
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CellInfo const & c (ci.second);
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if (c.lower_right.x > colmax) {
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colmax = c.lower_right.x;
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}
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if (c.lower_right.y > rowmax) {
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rowmax = c.lower_right.y;
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}
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}
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DEBUG_TRACE (DEBUG::CanvasTable, string_compose ("cell coordinates indicate rowmax %1 colmax %2 from %3 cells\n", rowmax, colmax, cells.size()));
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row_info.resize (rowmax+1);
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col_info.resize (colmax+1);
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for (auto& ci : cells) {
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CellInfo & c (ci.second);
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c.content->size_request (c.natural_size.x, c.natural_size.y);
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const float hspan = c.lower_right.x - c.upper_left.x;
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const float vspan = c.lower_right.y - c.upper_left.y;
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for (uint32_t row = c.upper_left.x; row != c.lower_right.x; ++row) {
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if (c.row_options & PackExpand) {
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row_info[row].expanders++;
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}
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if (c.row_options & PackShrink) {
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row_info[row].shrinkers++;
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}
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row_info[row].natural_size += c.natural_size.x / hspan;
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col_info[row].natural_size += c.padding.left + c.padding.right;
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col_info[row].natural_size += col_info[row].spacing;
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row_info[row].occupied = true;
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}
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for (uint32_t col = c.upper_left.y; col != c.lower_right.y; ++col) {
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if (c.col_options & PackExpand) {
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col_info[col].expanders++;
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}
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if (c.col_options & PackShrink) {
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col_info[col].shrinkers++;
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}
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col_info[col].natural_size += c.natural_size.y / vspan;
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col_info[col].natural_size += c.padding.up + c.padding.down;
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col_info[col].natural_size += col_info[c.lower_right.y].spacing;
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col_info[col].occupied = true;
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}
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}
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#ifndef NDEBUG
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if (DEBUG_ENABLED(DEBUG::CanvasTable)) {
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DEBUG_STR_DECL(a);
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int n = 0;
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for (auto& ai : row_info) {
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DEBUG_STR_APPEND(a, string_compose ("row %1: nwidth %2\n", n+1, ai.natural_size));
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++n;
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}
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DEBUG_TRACE (DEBUG::CanvasTable, DEBUG_STR(a).str());
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DEBUG_STR_DECL(b);
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n = 0;
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for (auto& ai : col_info) {
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DEBUG_STR_APPEND(b, string_compose ("col %1: nheight %2\n", n, ai.natural_size));
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++n;
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}
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DEBUG_TRACE (DEBUG::CanvasTable, DEBUG_STR(b).str());
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}
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#endif
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/* rows with nothing in them are still counted as existing. This is a
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* design decision, not a logic inevitability.
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*/
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const uint32_t rows = rowmax + 1;
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const uint32_t cols = colmax + 1;
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/* Find the tallest column and widest row. This will give us our
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* "natural size"
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*/
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Distance natural_row_width = 0.;
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Distance natural_col_height = 0.;
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for (AxisInfos::iterator ai = row_info.begin(); ai != row_info.end(); ++ai) {
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natural_row_width = std::max (natural_row_width, ai->natural_size);
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}
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for (AxisInfos::iterator ai = col_info.begin(); ai != col_info.end(); ++ai) {
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natural_col_height = std::max (natural_col_height, ai->natural_size);
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}
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DEBUG_TRACE (DEBUG::CanvasTable, string_compose ("natural width x height = %1 x %2\n", natural_row_width, natural_col_height));
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if (!within) {
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/* within is empty, so this is just for a size request */
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return Duple (natural_row_width, natural_col_height);
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}
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/* actually doing allocation, so prevent endless loop between here and
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* ::child_changed()
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*/
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PBD::Unwinder<bool> uw (ignore_child_changes, true);
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/* step two: compare the natural size to the size we've been given
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*
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* If the natural size is less than the allocated size, then find the
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* difference, divide it by the number of expanding items per
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* (row|col). Divide the total size by the number of (rows|cols), then
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* iterate. Allocate expanders the per-cell size plus the extra for
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* expansion. Allocate shrinkers/default just the per-cell size.
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*
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* If the natural size if greated than the allocated size, find the
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* difference, divide it by the number of shrinking items per
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* (row|col). Divide the total size by the number of (rows|cols), then
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* iterate. Allocate shrinkers the per-cell size minus the excess for
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* shrinking. Allocate expanders/default just the per-cell size.
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*
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*/
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if (homogenous) {
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Distance per_cell_width = within.width() / cols - 1;
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Distance per_cell_height = within.height() / rows - 1;
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DEBUG_TRACE (DEBUG::CanvasTable, string_compose ("per-cell: %1 x %2 from %3 and %4/%5\n", per_cell_width, per_cell_height, within, cols, rows));
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/* compute total expansion or contraction that will be
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* distributed across all rows & cols marked for expand/shrink
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*/
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for (auto & ai : row_info) {
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if (natural_row_width < within.width() && ai.expanders) {
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Distance delta = within.width() - natural_row_width;
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ai.expand = delta / ai.expanders;
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} else if (natural_row_width > within.width() && ai.shrinkers) {
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Distance delta = within.width() - natural_row_width;
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ai.shrink = delta / ai.shrinkers;
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}
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}
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for (auto & ai : col_info) {
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if (natural_col_height < within.height() && ai.expanders) {
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Distance delta = within.height() - natural_col_height;
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ai.expand = delta / ai.expanders;
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} else if (natural_col_height > within.height() && ai.shrinkers) {
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Distance delta = within.height() - natural_col_height;
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ai.shrink = delta / ai.shrinkers;
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}
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}
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for (auto& ci : cells) {
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CellInfo & c (ci.second);
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const float hspan = c.lower_right.x - c.upper_left.x;
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const float vspan = c.lower_right.y - c.upper_left.y;
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Distance w;
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Distance h;
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AxisInfo& col (col_info[c.upper_left.y]);
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AxisInfo& row (col_info[c.upper_left.x]);
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if (c.row_options & PackExpand) {
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w = hspan * (per_cell_width + row.expand);
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} else if (c.row_options & PackShrink) {
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w = hspan * (per_cell_width + row.shrink); /* note: row_shrink is negative */
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} else {
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w = hspan * per_cell_width;
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}
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if (c.col_options & PackExpand) {
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h = vspan * (per_cell_height + col.expand);
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} else if (c.col_options & PackShrink) {
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h = vspan * (per_cell_height + col.shrink); /* note: col_shrink is negative */
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} else {
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h = vspan * per_cell_height;
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}
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// w -= c.padding.left + c.padding.right;
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// w -= col.spacing;
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// h -= c.padding.up + c.padding.down;
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// h -= row.spacing;
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DEBUG_TRACE (DEBUG::CanvasTable, string_compose ("Cell @ %1,%2 - %3,%4 (hspan %7 vspan %8) allocated %5 x %6\n",
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ci.first.x, ci.first.y, ci.second.lower_right.x, ci.second.lower_right.y, w, h, hspan, vspan));
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c.allocate_size = Duple (w, h);
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}
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} else {
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/* not homogenous */
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}
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/* final pass: actually allocate position for each cell. Do this in a
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* row,col order so that we can set up position based on all cells
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* above and left of whichever one we are working on.
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*/
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Distance hdistance = 0.;
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Distance vdistance = 0.;
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for (uint32_t r = 0; r < rows; ++r) {
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Distance vshift = 0;
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hdistance = 0;
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for (uint32_t c = 0; c < cols; ++c) {
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Index idx (c, r);
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Cells::iterator ci = cells.find (idx);
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if (ci != cells.end()) {
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hdistance += ci->second.padding.left;
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Rect rect = Rect (hdistance, vdistance + ci->second.padding.up, hdistance + ci->second.allocate_size.x, vdistance + ci->second.allocate_size.y);
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DEBUG_TRACE (DEBUG::CanvasTable, string_compose ("Item @ %1,%2 - %3,%4 size-allocate %5\n",
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ci->second.upper_left.x,
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ci->second.upper_left.y,
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ci->second.lower_right.x,
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ci->second.lower_right.y,
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rect));
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ci->second.content->size_allocate (rect);
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hdistance += rect.width() + ci->second.padding.right;
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hdistance += col_info[c].spacing;
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const Distance total_cell_height = rect.height() + ci->second.padding.up + ci->second.padding.down;
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vshift = std::max (vshift, total_cell_height);
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} else {
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/* this cell (r, c) has no item starting within it */
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}
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}
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vshift += row_info[r].spacing;
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vdistance += vshift;
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}
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return Duple (hdistance, vdistance);
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}
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void
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Table::add (Item*)
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{
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fatal << _("programming error: add() cannot be used with Canvas::Table; use attach() instead") << endmsg;
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}
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void
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Table::add_front (Item*)
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{
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fatal << _("programming error: add_front() cannot be used with Canvas::Table; use attach() instead") << endmsg;
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}
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void
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Table::remove (Item*)
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{
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fatal << _("programming error: remove() cannot be used with Canvas::Table; use detach() instead") << endmsg;
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}
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void
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Table::_add (Item* i)
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{
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if (!i) {
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return;
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}
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Item::add (i);
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queue_resize ();
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}
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void
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Table::_add_front (Item* i)
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{
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if (!i) {
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return;
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}
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Item::add_front (i);
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queue_resize ();
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}
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void
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Table::_remove (Item* i)
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{
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if (!i) {
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return;
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}
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Item::remove (i);
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queue_resize ();
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}
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