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Update JSONListModel.qml #3

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d977d7b
Update JSONListModel.qml
think-free Feb 7, 2014
a931d5c
Update JSONListModel.qml
think-free Feb 13, 2014
db27369
Update JSONListModel.qml
think-free Feb 13, 2014
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86 changes: 77 additions & 9 deletions JSONListModel/JSONListModel.qml
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Original file line number Diff line number Diff line change
Expand Up @@ -4,16 +4,21 @@
* Licensed under the MIT licence (http://opensource.org/licenses/mit-license.php)
*/

import QtQuick 1.1
import QtQuick 2.0
import "jsonpath.js" as JSONPath

Item {
property string source: ""
property string json: ""
property string query: ""

property string propId: "" // If this property is defined (unique identifier of each object) we'll update only the changes without destroying everything

property ListModel model : ListModel { id: jsonModel }
property alias count: jsonModel.count

signal jsonModelChanged;

property string jsonAnt: ""

onSourceChanged: {
var xhr = new XMLHttpRequest;
Expand All @@ -29,16 +34,79 @@ Item {
onQueryChanged: updateJSONModel()

function updateJSONModel() {
jsonModel.clear();
var objectArray;
var jo;
if (json === "")
{
jsonModel.clear();
}
else if (propId === "" || jsonAnt === "")
{
jsonModel.clear();
objectArray = parseJSONString(json, query);
for (var key in objectArray ) {
jo = objectArray[key];
jsonModel.append(jo);
}
}
else
{
var i, j, id, found;
objectArray = parseJSONString(json, query);
var objectArrayAnt = parseJSONString(jsonAnt, query);

if ( json === "" )
return;
// Detect new and modified elements

for (i = 0; i < objectArray.length; ++i ) {
id = objectArray[i][propId];
found = false;
for (j = 0; j < objectArrayAnt.length; ++j) {
if (id === objectArrayAnt[j][propId])
{
found = true;
break;
}
}

var objectArray = parseJSONString(json, query);
for ( var key in objectArray ) {
var jo = objectArray[key];
jsonModel.append( jo );
if (!found)
{
jsonModel.append(objectArray[i]);
}
else
{
if (JSON.stringify(objectArray[i]) !== JSON.stringify(objectArrayAnt[j]))
{
// Don't do the following because set() merges properties instead of replacing
// Instead we remove it and insert it
// jsonModel.set(j, objectArray[i]);

jsonModel.remove(j);
jsonModel.insert(j, objectArray[i]);
}
}
}

// Detect the removed elements

for (i = objectArrayAnt.length - 1; i >= 0; --i ) {
id = objectArrayAnt[i][propId];
found = false;
for (j = objectArray.length - 1; j >= 0; --j ) {
if (id === objectArray[j][propId])
{
found = true;
break;
}
}
if (!found)
{
jsonModel.remove(i);
}
}
}

jsonModelChanged();
jsonAnt = json;
}

function parseJSONString(jsonString, jsonPathQuery) {
Expand Down