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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
import QtQuick 2.1
QtObject {
property int count: 0
signal selectionChanged
property bool __dirty: false
property var __ranges: new Array()
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 = new Array()
__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()
}
}
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