godot/scene/gui/grid_container.cpp

/*************************************************************************/
/*  grid_container.cpp                                                   */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
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#include "grid_container.h"

void GridContainer::_notification(int p_what) {

	switch (p_what) {

		case NOTIFICATION_SORT_CHILDREN: {

			Map<int, int> col_minw;
			Map<int, int> row_minh;
			Set<int> col_expanded;
			Set<int> row_expanded;

			int hsep = get_constant("hseparation");
			int vsep = get_constant("vseparation");

			int idx = 0;
			int max_row = 0;
			int max_col = 0;

			Size2 size = get_size();

			for (int i = 0; i < get_child_count(); i++) {

				Control *c = Object::cast_to<Control>(get_child(i));
				if (!c || !c->is_visible_in_tree())
					continue;

				int row = idx / columns;
				int col = idx % columns;

				Size2i ms = c->get_combined_minimum_size();
				if (col_minw.has(col))
					col_minw[col] = MAX(col_minw[col], ms.width);
				else
					col_minw[col] = ms.width;

				if (row_minh.has(row))
					row_minh[row] = MAX(row_minh[row], ms.height);
				else
					row_minh[row] = ms.height;

				//print_line("store row "+itos(row)+" mw "+itos(ms.height));

				if (c->get_h_size_flags() & SIZE_EXPAND)
					col_expanded.insert(col);
				if (c->get_v_size_flags() & SIZE_EXPAND)
					row_expanded.insert(row);

				max_col = MAX(col, max_col);
				max_row = MAX(row, max_row);
				idx++;
			}

			Size2 ms;
			int expand_rows = 0;
			int expand_cols = 0;

			for (Map<int, int>::Element *E = col_minw.front(); E; E = E->next()) {
				ms.width += E->get();
				if (col_expanded.has(E->key()))
					expand_cols++;
			}

			for (Map<int, int>::Element *E = row_minh.front(); E; E = E->next()) {
				ms.height += E->get();
				if (row_expanded.has(E->key()))
					expand_rows++;
			}

			ms.height += vsep * max_row;
			ms.width += hsep * max_col;

			int row_expand = expand_rows ? (size.y - ms.y) / expand_rows : 0;
			int col_expand = expand_cols ? (size.x - ms.x) / expand_cols : 0;

			int col_ofs = 0;
			int row_ofs = 0;
			idx = 0;

			for (int i = 0; i < get_child_count(); i++) {

				Control *c = Object::cast_to<Control>(get_child(i));
				if (!c || !c->is_visible_in_tree())
					continue;
				int row = idx / columns;
				int col = idx % columns;

				if (col == 0) {
					col_ofs = 0;
					if (row > 0 && row_minh.has(row - 1))
						row_ofs += row_minh[row - 1] + vsep + (row_expanded.has(row - 1) ? row_expand : 0);
				}

				Size2 s;
				if (col_minw.has(col))
					s.width = col_minw[col];
				if (row_minh.has(row))
					s.height = row_minh[row];

				if (row_expanded.has(row))
					s.height += row_expand;
				if (col_expanded.has(col))
					s.width += col_expand;

				Point2 p(col_ofs, row_ofs);

				//print_line("col: "+itos(col)+" row: "+itos(row)+" col_ofs: "+itos(col_ofs)+" row_ofs: "+itos(row_ofs));
				fit_child_in_rect(c, Rect2(p, s));
				//print_line("col: "+itos(col)+" row: "+itos(row)+" rect: "+Rect2(p,s));

				if (col_minw.has(col)) {
					col_ofs += col_minw[col] + hsep + (col_expanded.has(col) ? col_expand : 0);
				}

				idx++;
			}

		} break;
	}
}

void GridContainer::set_columns(int p_columns) {

	ERR_FAIL_COND(p_columns < 1);
	columns = p_columns;
	queue_sort();
	minimum_size_changed();
}

int GridContainer::get_columns() const {

	return columns;
}

void GridContainer::_bind_methods() {

	ClassDB::bind_method(D_METHOD("set_columns", "columns"), &GridContainer::set_columns);
	ClassDB::bind_method(D_METHOD("get_columns"), &GridContainer::get_columns);

	ADD_PROPERTY(PropertyInfo(Variant::INT, "columns", PROPERTY_HINT_RANGE, "1,1024,1"), "set_columns", "get_columns");
}

Size2 GridContainer::get_minimum_size() const {

	Map<int, int> col_minw;
	Map<int, int> row_minh;

	int hsep = get_constant("hseparation");
	int vsep = get_constant("vseparation");

	int idx = 0;
	int max_row = 0;
	int max_col = 0;

	for (int i = 0; i < get_child_count(); i++) {

		Control *c = Object::cast_to<Control>(get_child(i));
		if (!c || !c->is_visible_in_tree())
			continue;
		int row = idx / columns;
		int col = idx % columns;
		Size2i ms = c->get_combined_minimum_size();
		if (col_minw.has(col))
			col_minw[col] = MAX(col_minw[col], ms.width);
		else
			col_minw[col] = ms.width;

		if (row_minh.has(row))
			row_minh[row] = MAX(row_minh[row], ms.height);
		else
			row_minh[row] = ms.height;
		max_col = MAX(col, max_col);
		max_row = MAX(row, max_row);
		idx++;
	}

	Size2 ms;

	for (Map<int, int>::Element *E = col_minw.front(); E; E = E->next()) {
		ms.width += E->get();
	}

	for (Map<int, int>::Element *E = row_minh.front(); E; E = E->next()) {
		ms.height += E->get();
	}

	ms.height += vsep * max_row;
	ms.width += hsep * max_col;

	return ms;
}

GridContainer::GridContainer() {

	set_mouse_filter(MOUSE_FILTER_PASS);
	columns = 1;
}