348 lines
11 KiB
C++
348 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().has_flag(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().has_flag(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().has_flag(SIZE_FILL) || child->get_h_size_flags().has_flag(SIZE_SHRINK_CENTER) || child->get_h_size_flags().has_flag(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().has_flag(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().has_flag(SIZE_FILL) || child->get_v_size_flags().has_flag(SIZE_SHRINK_CENTER) || child->get_v_size_flags().has_flag(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().has_flag(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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