d95794ec8a
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see".
349 lines
11 KiB
C++
349 lines
11 KiB
C++
/**************************************************************************/
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/* flow_container.cpp */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#include "flow_container.h"
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struct _LineData {
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int child_count = 0;
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int min_line_height = 0;
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int min_line_length = 0;
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int stretch_avail = 0;
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float stretch_ratio_total = 0;
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};
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void FlowContainer::_resort() {
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// Avoid resorting if invisible.
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if (!is_visible_in_tree()) {
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return;
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}
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bool rtl = is_layout_rtl();
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HashMap<Control *, Size2i> children_minsize_cache;
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Vector<_LineData> lines_data;
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Vector2i ofs;
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int line_height = 0;
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int line_length = 0;
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float line_stretch_ratio_total = 0;
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int current_container_size = vertical ? get_rect().size.y : get_rect().size.x;
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int children_in_current_line = 0;
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// First pass for line wrapping and minimum size calculation.
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for (int i = 0; i < get_child_count(); i++) {
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Control *child = Object::cast_to<Control>(get_child(i));
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if (!child || !child->is_visible()) {
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continue;
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}
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if (child->is_set_as_top_level()) {
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continue;
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}
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Size2i child_msc = child->get_combined_minimum_size();
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if (vertical) { /* VERTICAL */
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if (children_in_current_line > 0) {
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ofs.y += theme_cache.v_separation;
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}
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if (ofs.y + child_msc.y > current_container_size) {
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line_length = ofs.y - theme_cache.v_separation;
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lines_data.push_back(_LineData{ children_in_current_line, line_height, line_length, current_container_size - line_length, line_stretch_ratio_total });
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// Move in new column (vertical line).
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ofs.x += line_height + theme_cache.h_separation;
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ofs.y = 0;
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line_height = 0;
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line_stretch_ratio_total = 0;
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children_in_current_line = 0;
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}
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line_height = MAX(line_height, child_msc.x);
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if (child->get_v_size_flags() & SIZE_EXPAND) {
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line_stretch_ratio_total += child->get_stretch_ratio();
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}
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ofs.y += child_msc.y;
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} else { /* HORIZONTAL */
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if (children_in_current_line > 0) {
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ofs.x += theme_cache.h_separation;
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}
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if (ofs.x + child_msc.x > current_container_size) {
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line_length = ofs.x - theme_cache.h_separation;
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lines_data.push_back(_LineData{ children_in_current_line, line_height, line_length, current_container_size - line_length, line_stretch_ratio_total });
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// Move in new line.
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ofs.y += line_height + theme_cache.v_separation;
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ofs.x = 0;
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line_height = 0;
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line_stretch_ratio_total = 0;
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children_in_current_line = 0;
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}
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line_height = MAX(line_height, child_msc.y);
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if (child->get_h_size_flags() & SIZE_EXPAND) {
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line_stretch_ratio_total += child->get_stretch_ratio();
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}
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ofs.x += child_msc.x;
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}
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children_minsize_cache[child] = child_msc;
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children_in_current_line++;
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}
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line_length = vertical ? (ofs.y) : (ofs.x);
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lines_data.push_back(_LineData{ children_in_current_line, line_height, line_length, current_container_size - line_length, line_stretch_ratio_total });
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// Second pass for in-line expansion and alignment.
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int current_line_idx = 0;
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int child_idx_in_line = 0;
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ofs.x = 0;
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ofs.y = 0;
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for (int i = 0; i < get_child_count(); i++) {
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Control *child = Object::cast_to<Control>(get_child(i));
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if (!child || !child->is_visible()) {
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continue;
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}
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if (child->is_set_as_top_level()) {
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continue;
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}
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Size2i child_size = children_minsize_cache[child];
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_LineData line_data = lines_data[current_line_idx];
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if (child_idx_in_line >= lines_data[current_line_idx].child_count) {
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current_line_idx++;
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child_idx_in_line = 0;
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if (vertical) {
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ofs.x += line_data.min_line_height + theme_cache.h_separation;
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ofs.y = 0;
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} else {
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ofs.x = 0;
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ofs.y += line_data.min_line_height + theme_cache.v_separation;
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}
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line_data = lines_data[current_line_idx];
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}
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// The first child of each line adds the offset caused by the alignment,
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// but only if the line doesn't contain a child that expands.
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if (child_idx_in_line == 0 && Math::is_equal_approx(line_data.stretch_ratio_total, 0)) {
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int alignment_ofs = 0;
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switch (alignment) {
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case ALIGNMENT_CENTER:
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alignment_ofs = line_data.stretch_avail / 2;
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break;
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case ALIGNMENT_END:
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alignment_ofs = line_data.stretch_avail;
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break;
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default:
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break;
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}
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if (vertical) { /* VERTICAL */
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ofs.y += alignment_ofs;
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} else { /* HORIZONTAL */
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ofs.x += alignment_ofs;
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}
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}
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if (vertical) { /* VERTICAL */
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if (child->get_h_size_flags() & (SIZE_FILL | SIZE_SHRINK_CENTER | SIZE_SHRINK_END)) {
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child_size.width = line_data.min_line_height;
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}
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if (child->get_v_size_flags() & SIZE_EXPAND) {
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int stretch = line_data.stretch_avail * child->get_stretch_ratio() / line_data.stretch_ratio_total;
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child_size.height += stretch;
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}
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} else { /* HORIZONTAL */
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if (child->get_v_size_flags() & (SIZE_FILL | SIZE_SHRINK_CENTER | SIZE_SHRINK_END)) {
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child_size.height = line_data.min_line_height;
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}
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if (child->get_h_size_flags() & SIZE_EXPAND) {
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int stretch = line_data.stretch_avail * child->get_stretch_ratio() / line_data.stretch_ratio_total;
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child_size.width += stretch;
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}
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}
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Rect2 child_rect = Rect2(ofs, child_size);
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if (rtl) {
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child_rect.position.x = get_rect().size.x - child_rect.position.x - child_rect.size.width;
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}
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fit_child_in_rect(child, child_rect);
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if (vertical) { /* VERTICAL */
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ofs.y += child_size.height + theme_cache.v_separation;
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} else { /* HORIZONTAL */
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ofs.x += child_size.width + theme_cache.h_separation;
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}
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child_idx_in_line++;
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}
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cached_size = (vertical ? ofs.x : ofs.y) + line_height;
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cached_line_count = lines_data.size();
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}
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Size2 FlowContainer::get_minimum_size() const {
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Size2i minimum;
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for (int i = 0; i < get_child_count(); i++) {
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Control *c = Object::cast_to<Control>(get_child(i));
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if (!c) {
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continue;
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}
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if (c->is_set_as_top_level()) {
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continue;
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}
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if (!c->is_visible()) {
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continue;
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}
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Size2i size = c->get_combined_minimum_size();
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if (vertical) { /* VERTICAL */
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minimum.height = MAX(minimum.height, size.height);
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minimum.width = cached_size;
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} else { /* HORIZONTAL */
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minimum.width = MAX(minimum.width, size.width);
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minimum.height = cached_size;
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}
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}
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return minimum;
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}
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Vector<int> FlowContainer::get_allowed_size_flags_horizontal() const {
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Vector<int> flags;
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flags.append(SIZE_FILL);
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if (!vertical) {
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flags.append(SIZE_EXPAND);
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}
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flags.append(SIZE_SHRINK_BEGIN);
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flags.append(SIZE_SHRINK_CENTER);
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flags.append(SIZE_SHRINK_END);
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return flags;
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}
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Vector<int> FlowContainer::get_allowed_size_flags_vertical() const {
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Vector<int> flags;
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flags.append(SIZE_FILL);
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if (vertical) {
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flags.append(SIZE_EXPAND);
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}
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flags.append(SIZE_SHRINK_BEGIN);
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flags.append(SIZE_SHRINK_CENTER);
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flags.append(SIZE_SHRINK_END);
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return flags;
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}
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void FlowContainer::_update_theme_item_cache() {
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Container::_update_theme_item_cache();
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theme_cache.h_separation = get_theme_constant(SNAME("h_separation"));
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theme_cache.v_separation = get_theme_constant(SNAME("v_separation"));
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}
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void FlowContainer::_notification(int p_what) {
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switch (p_what) {
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case NOTIFICATION_SORT_CHILDREN: {
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_resort();
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update_minimum_size();
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} break;
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case NOTIFICATION_THEME_CHANGED: {
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update_minimum_size();
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} break;
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case NOTIFICATION_TRANSLATION_CHANGED:
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case NOTIFICATION_LAYOUT_DIRECTION_CHANGED: {
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queue_sort();
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} break;
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}
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}
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void FlowContainer::_validate_property(PropertyInfo &p_property) const {
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if (is_fixed && p_property.name == "vertical") {
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p_property.usage = PROPERTY_USAGE_NONE;
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}
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}
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int FlowContainer::get_line_count() const {
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return cached_line_count;
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}
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void FlowContainer::set_alignment(AlignmentMode p_alignment) {
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if (alignment == p_alignment) {
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return;
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}
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alignment = p_alignment;
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_resort();
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}
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FlowContainer::AlignmentMode FlowContainer::get_alignment() const {
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return alignment;
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}
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void FlowContainer::set_vertical(bool p_vertical) {
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ERR_FAIL_COND_MSG(is_fixed, "Can't change orientation of " + get_class() + ".");
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vertical = p_vertical;
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update_minimum_size();
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_resort();
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}
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bool FlowContainer::is_vertical() const {
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return vertical;
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}
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FlowContainer::FlowContainer(bool p_vertical) {
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vertical = p_vertical;
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}
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void FlowContainer::_bind_methods() {
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ClassDB::bind_method(D_METHOD("get_line_count"), &FlowContainer::get_line_count);
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ClassDB::bind_method(D_METHOD("set_alignment", "alignment"), &FlowContainer::set_alignment);
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ClassDB::bind_method(D_METHOD("get_alignment"), &FlowContainer::get_alignment);
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ClassDB::bind_method(D_METHOD("set_vertical", "vertical"), &FlowContainer::set_vertical);
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ClassDB::bind_method(D_METHOD("is_vertical"), &FlowContainer::is_vertical);
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BIND_ENUM_CONSTANT(ALIGNMENT_BEGIN);
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BIND_ENUM_CONSTANT(ALIGNMENT_CENTER);
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BIND_ENUM_CONSTANT(ALIGNMENT_END);
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ADD_PROPERTY(PropertyInfo(Variant::INT, "alignment", PROPERTY_HINT_ENUM, "Begin,Center,End"), "set_alignment", "get_alignment");
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ADD_PROPERTY(PropertyInfo(Variant::BOOL, "vertical"), "set_vertical", "is_vertical");
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}
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