mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-15 20:50:28 +00:00
199 lines
4.9 KiB
C++
199 lines
4.9 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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* Copyright (C) 2016 Furrtek
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*
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* This file is part of PortaPack.
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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, or (at your option)
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* 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
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "ui_focus.hpp"
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#include "ui_widget.hpp"
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#include <cstdint>
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#include <algorithm>
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#include <functional>
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#include <utility>
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#include <vector>
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namespace ui {
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Widget* FocusManager::focus_widget() const {
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return focus_widget_;
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}
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void FocusManager::set_focus_widget(Widget* const new_focus_widget) {
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// Widget already has focus.
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if( new_focus_widget == focus_widget() ) {
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return;
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}
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if( new_focus_widget ) {
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// if( !new_focus_widget->visible() ) {
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// if( new_focus_widget->hidden() ) {
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// // New widget is not visible. Do nothing.
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// // TODO: Should this be a debug assertion?
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// return;
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// }
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if( !new_focus_widget->focusable() ) {
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return;
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}
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}
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// Blur old widget.
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if( focus_widget() ) {
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focus_widget()->on_blur();
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focus_widget()->set_dirty();
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}
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focus_widget_ = new_focus_widget;
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if( focus_widget() ) {
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focus_widget()->on_focus();
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focus_widget()->set_dirty();
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}
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}
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using test_result_t = std::pair<Widget* const, const uint32_t>;
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using test_fn = std::function<test_result_t(Widget* const)>;
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using test_collection_t = std::vector<test_result_t>;
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/* Walk all visible widgets in hierarchy, collecting those that pass test */
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template<typename TestFn>
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static void widget_collect_visible(Widget* const w, TestFn test, test_collection_t& collection) {
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for(auto child : w->children()) {
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if( !child->hidden() ) {
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const auto result = test(child);
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if( result.first ) {
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collection.push_back(result);
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}
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widget_collect_visible(child, test, collection);
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}
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}
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}
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static int32_t rect_distances(
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const KeyEvent direction,
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const Rect& rect_start,
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const Rect& rect_end
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) {
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Coord on_axis_max, on_axis_min;
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switch(direction) {
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case KeyEvent::Right:
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on_axis_max = rect_end.left();
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on_axis_min = rect_start.right();
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break;
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case KeyEvent::Left:
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on_axis_max = rect_start.left();
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on_axis_min = rect_end.right();
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break;
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case KeyEvent::Down:
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on_axis_max = rect_end.top();
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on_axis_min = rect_start.bottom();
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break;
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case KeyEvent::Up:
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on_axis_max = rect_start.top();
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on_axis_min = rect_end.bottom();
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break;
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default:
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return -1;
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}
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Coord on_axis_distance = on_axis_max - on_axis_min;
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if( on_axis_distance < 0 ) {
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return -1;
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}
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Coord perpendicular_axis_start, perpendicular_axis_end;
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switch(direction) {
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case KeyEvent::Right:
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case KeyEvent::Left:
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perpendicular_axis_start = rect_start.center().y();
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perpendicular_axis_end = rect_end.center().y();
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break;
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case KeyEvent::Up:
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case KeyEvent::Down:
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perpendicular_axis_start = rect_start.center().x();
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perpendicular_axis_end = rect_end.center().x();
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break;
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default:
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return -1;
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}
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return (std::abs(perpendicular_axis_end - perpendicular_axis_start) + 1) * (on_axis_distance + 1);
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}
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void FocusManager::update(
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Widget* const top_widget,
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const KeyEvent event
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) {
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if( focus_widget() ) {
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const auto focus_screen_rect = focus_widget()->screen_rect();
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const auto test_fn = [&focus_screen_rect, event](ui::Widget* const w) -> test_result_t {
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// if( w->visible() && w->focusable() ) {
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if( w->focusable() ) {
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const auto distance = rect_distances(event, focus_screen_rect, w->screen_rect());
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if( distance >= 0 ) {
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return { w, distance };
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}
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}
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return { nullptr, 0 };
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};
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const auto find_back_fn = [](ui::Widget* const w) -> test_result_t {
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if( w->focusable() && (w->id == -1) )
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return { w, 0 };
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else
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return { nullptr, 0 };
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};
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test_collection_t collection;
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widget_collect_visible(top_widget, test_fn, collection);
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const auto compare_fn = [](const test_result_t& a, const test_result_t& b) {
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return a.second < b.second;
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};
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const auto nearest = std::min_element(collection.cbegin(), collection.cend(), compare_fn);
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if( nearest != collection.cend() ) {
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//focus->blur();
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const auto new_focus = (*nearest).first;
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set_focus_widget(new_focus);
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} else {
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if ((focus_widget()->id >= 0) && (event == KeyEvent::Left)) {
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// Stuck left, move to back button
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collection.clear();
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widget_collect_visible(top_widget, find_back_fn, collection);
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if (!collection.empty())
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set_focus_widget(collection[0].first);
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}
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}
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}
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}
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} /* namespace ui */
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