93 lines
2.5 KiB
C++
93 lines
2.5 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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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 3 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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef ZVISION_FOCUS_LIST_H
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#define ZVISION_FOCUS_LIST_H
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#include "common/array.h"
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namespace ZVision {
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/**
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* FILO array of unique members
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*
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* Tracks redraw order of layered graphical elements.
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* When an element has current focus, it is reshuffled to the top of the pile.
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* When redrawing, start with last (bottom) element of list and finish with first (top)
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* Used to:
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* - ensure scrolling menus are drawn in the order in which they last had mouse focus.
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* - ensure most recently updated subtitle is drawn atop all others.
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*/
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template<class T>
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class FocusList : public Common::Array<T> {
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private:
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typedef uint size_type;
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public:
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/**
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* Move unique entry to front of list; add to list if not already present.
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* Sequence of all remaining members remains unchanged.
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*/
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void set(const T currentFocus) {
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if (!this->size())
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this->push_back(currentFocus);
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else {
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if (this->front() != currentFocus) {
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Common::Array<T> buffer;
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while (this->size() > 0) {
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if (this->back() != currentFocus)
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buffer.push_back(this->back());
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this->pop_back();
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}
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this->push_back(currentFocus);
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while (buffer.size() > 0) {
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this->push_back(buffer.back());
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buffer.pop_back();
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}
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}
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}
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}
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/**
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* Remove unique entry, if present.
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* Sequence of all remaining members remains unchanged.
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*/
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void remove(const T value) {
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if (this->size()) {
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Common::Array<T> buffer;
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while (this->size() > 0) {
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if (this->back() != value)
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buffer.push_back(this->back());
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this->pop_back();
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}
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while (buffer.size() > 0) {
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this->push_back(buffer.back());
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buffer.pop_back();
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}
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}
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}
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};
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} // End of namespace ZVision
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#endif
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