| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the Qt Quick Controls module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
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| ** GNU Lesser General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU Lesser |
| ** General Public License version 3 as published by the Free Software |
| ** Foundation and appearing in the file LICENSE.LGPL3 included in the |
| ** packaging of this file. Please review the following information to |
| ** ensure the GNU Lesser General Public License version 3 requirements |
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| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
| ** Public license version 3 or any later version approved by the KDE Free |
| ** Qt Foundation. The licenses are as published by the Free Software |
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| ****************************************************************************/ |
| |
| import QtQuick 2.2 |
| |
| QtObject { |
| |
| property int count: 0 |
| signal selectionChanged |
| |
| property bool __dirty: false |
| property var __ranges: [] |
| |
| function forEach (callback) { |
| if (!(callback instanceof Function)) { |
| console.warn("TableViewSelection.forEach: argument is not a function") |
| return; |
| } |
| __forEach(callback, -1) |
| } |
| |
| function contains(index) { |
| for (var i = 0 ; i < __ranges.length ; ++i) { |
| if (__ranges[i][0] <= index && index <= __ranges[i][1]) |
| return true; |
| else if (__ranges[i][0] > index) |
| return false; |
| } |
| return false; |
| } |
| |
| function clear() { |
| __ranges = [] |
| __dirty = true |
| count = 0 |
| selectionChanged() |
| } |
| |
| function selectAll() { select(0, rowCount - 1) } |
| function select(first, last) { __select(true, first, last) } |
| function deselect(first, last) { __select(false, first, last) } |
| |
| // --- private section --- |
| |
| function __printRanges() { |
| var out = "" |
| for (var i = 0 ; i < __ranges.length ; ++ i) |
| out += ("{" + __ranges[i][0] + "," + __ranges[i][1] + "} ") |
| print(out) |
| } |
| |
| function __count() { |
| var sum = 0 |
| for (var i = 0 ; i < __ranges.length ; ++i) { |
| sum += (1 + __ranges[i][1] - __ranges[i][0]) |
| } |
| return sum |
| } |
| |
| function __forEach (callback, startIndex) { |
| __dirty = false |
| var i, j |
| |
| for (i = 0 ; i < __ranges.length && !__dirty ; ++i) { |
| for (j = __ranges[i][0] ; !__dirty && j <= __ranges[i][1] ; ++j) { |
| if (j >= startIndex) |
| callback.call(this, j) |
| } |
| } |
| |
| // Restart iteration at last index if selection changed |
| if (__dirty) |
| return __forEach(callback, j) |
| } |
| |
| function __selectOne(index) { |
| __ranges = [[index, index]] |
| __dirty = true |
| count = 1 |
| selectionChanged(); |
| } |
| |
| function __select(select, first, last) { |
| |
| var i, range |
| var start = first |
| var stop = first |
| var startRangeIndex = -1 |
| var stopRangeIndex = -1 |
| var newRangePos = 0 |
| |
| if (first < 0 || last < 0 || first >= rowCount || last >=rowCount) { |
| console.warn("TableViewSelection: index out of range") |
| return |
| } |
| |
| if (last !== undefined) { |
| start = first <= last ? first : last |
| stop = first <= last ? last : first |
| } |
| |
| if (select) { |
| |
| // Find beginning and end ranges |
| for (i = 0 ; i < __ranges.length; ++ i) { |
| range = __ranges[i] |
| if (range[0] > stop + 1) continue; // above range |
| if (range[1] < start - 1) { // below range |
| newRangePos = i + 1 |
| continue; |
| } |
| if (startRangeIndex === -1) |
| startRangeIndex = i |
| stopRangeIndex = i |
| } |
| |
| if (startRangeIndex !== -1) |
| start = Math.min(__ranges[startRangeIndex][0], start) |
| if (stopRangeIndex !== -1) |
| stop = Math.max(__ranges[stopRangeIndex][1], stop) |
| |
| if (startRangeIndex === -1) |
| startRangeIndex = newRangePos |
| |
| __ranges.splice(Math.max(0, startRangeIndex), |
| 1 + stopRangeIndex - startRangeIndex, [start, stop]) |
| |
| } else { |
| |
| // Find beginning and end ranges |
| for (i = 0 ; i < __ranges.length; ++ i) { |
| range = __ranges[i] |
| if (range[1] < start) continue; // below range |
| if (range[0] > stop) continue; // above range |
| if (startRangeIndex === -1) |
| startRangeIndex = i |
| stopRangeIndex = i |
| } |
| |
| // Slice ranges accordingly |
| if (startRangeIndex >= 0 && stopRangeIndex >= 0) { |
| var startRange = __ranges[startRangeIndex] |
| var stopRange = __ranges[stopRangeIndex] |
| var length = 1 + stopRangeIndex - startRangeIndex |
| if (start <= startRange[0] && stop >= stopRange[1]) { //remove |
| __ranges.splice(startRangeIndex, length) |
| } else if (start - 1 < startRange[0] && stop <= stopRange[1]) { //cut front |
| __ranges.splice(startRangeIndex, length, [stop + 1, stopRange[1]]) |
| } else if (start - 1 < startRange[1] && stop >= stopRange[1]) { // cut back |
| __ranges.splice(startRangeIndex, length, [startRange[0], start - 1]) |
| } else { //split |
| __ranges.splice(startRangeIndex, length, [startRange[0], start - 1], [stop + 1, stopRange[1]]) |
| } |
| } |
| } |
| __dirty = true |
| count = __count() // forces a re-evaluation of indexes in the delegates |
| selectionChanged() |
| } |
| } |