/usr/share/u1db-qt/examples/u1db-qt-example-3.qml is in libu1db-qt5-examples 0.1.5+15.10.20150826.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2013 Canonical, Ltd.
*
* Authors:
* Kevin Wright <kevin.wright@canonical.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import QtQuick 2.0
import U1db 1.0 as U1db
import Ubuntu.Components 0.1
/*!
This example and tutorial is designed to show a wide variety of U1Db-Qt functionality and usage. The example demonstrates:
\list 1
\li Combining U1Db-Qt with elements and components that do not utilize models
\li Blending the U1Db-Qt plugin with QML and Javascript
\endlist
*/
MainView {
width: units.gu(45)
height: units.gu(80)
/*!
A Database is very simple to create. It only needs an id and a path where the file will be created. A Database is a model, which can be used by elements, such as the ListView further in this example.
U1db.Database {
id: aDatabase
path: "aDatabase3"
}
*/
U1db.Database {
id: aDatabase
path: Qt.resolvedUrl("aDatabase3")
}
/*!
A Document can be declared at runtime. It requires at the very least a unique 'docId', but that alone won't do anything special. The snipet below snippet demonstrates the basic requirements.
In addition to this, this example displays text from the database for a specific docId and id key in a text area called 'documentContent. To update the text area at startup with either the default value or a value from the database the onCompleted function is utilized, which is also demonstrated below.
U1db.Document {
id: aDocument
database: aDatabase
docId: 'helloworld'
create: true
defaults: { "helloworld":"Hello World" }
Component.onCompleted: {
documentContent.text = aDocument.contents.helloworld
}
}
*/
U1db.Document {
id: aDocument
database: aDatabase
docId: 'helloworld'
create: true
defaults: { "helloworld":"Hello World" }
Component.onCompleted: {
documentContent.text = aDocument.contents.helloworld
}
}
function switchToPreviousDocument(documentObject){
aDocument.docId = getPreviousDocumentId(documentObject)
}
function switchToNextDocument(){
aDocument.docId = getNextDocumentId(aDocument)
}
function getPreviousDocumentId(documentObject){
if(typeof documentObject!='undefined'){
/*!
The listDocs method retrieves all the docId values from the current database. In this demonstration the values are put into an array, which is then checked to locate the docId for the current and previous documents within the database.
var documentIds = {}
documentIds = documentObject.database.listDocs()
for(var i = 0; i < documentIds.length; i++){
if(documentIds[i]===documentObject.docId && i > 0){
return documentIds[i-1]
}
else if(documentIds[i]===documentObject.docId && i==0){
return documentIds[documentIds.length-1]
}
}
*/
var documentIds = {}
documentIds = documentObject.database.listDocs()
for(var i = 0; i < documentIds.length; i++){
if(documentIds[i]===documentObject.docId && i > 0){
return documentIds[i-1]
}
else if(documentIds[i]===documentObject.docId && i==0){
return documentIds[documentIds.length-1]
}
}
return documentIds[0]
}
else{
print("Error!")
return ''
}
}
function getNextDocumentId(documentObject){
if(typeof documentObject!='undefined'){
var documentIds = documentObject.database.listDocs()
for(var i = 0; i < documentIds.length; i++){
if(documentIds[i]===documentObject.docId && i < (documentIds.length-1)){
return documentIds[i+1]
}
else if(documentIds[i]===documentObject.docId && i==(documentIds.length-1)){
return documentIds[0]
}
}
return documentIds[0]
}
else{
print("Error!")
return ''
}
}
function getCurrentDocumentKey(contentsObject){
if(typeof contentsObject!='undefined'){
var keys = Object.keys(contentsObject);
return keys[0]
}
else{
return ''
}
}
function updateContentWindow(documentText, addressBarText) {
// Somewhere below need to check for things like invalid docId
if(documentText!==addressBarText) {
/*!
These steps demonstrate the creation of a temporary document, based on a copy of the global document. This will then be used to determine if there is already a document in the database with the same docId as the address bar, and additionally with a key id with the same name.
var tempDocument = {}
var tempFieldName = addressBarText;
var tempContents = {};
tempDocument = aDocument
tempDocument.docId = addressBarText;
tempContents = tempDocument.contents
NOTE: For simplicity sake this example sometimes uses the same value for both the docId and the key id, as seen here. Real life implimentations can and will differ, and this will be demonstrated elsewhere in the example code.
*/
var tempDocument = {}
var tempFieldName = addressBarText;
var tempContents = {};
tempDocument = aDocument
tempDocument.docId = addressBarText;
tempContents = tempDocument.contents
if(typeof tempContents !='undefined' && typeof tempContents[tempFieldName]!='undefined') {
aDocument = tempDocument
documentContent.text = tempContents[tempFieldName]
}
else {
/*!
Here the contents of the temporary document are modified, which then replaces the global document.
documentContent.text = 'More Hello World...';
tempContents = {}
tempContents[tempFieldName] = documentContent.text
tempDocument.contents = tempContents
aDocument = tempDocument
*/
documentContent.text = 'More Hello World...';
tempContents = {}
tempContents[tempFieldName] = documentContent.text
tempDocument.contents = tempContents
aDocument = tempDocument
}
}
else {
/*!
In this instance the current document's content is updated from the text view. The unique key and docId are not modified because the database already contains a record with those properties.
tempContents = {}
tempFieldName = getCurrentDocumentKey(aDocument.contents)
tempContents[tempFieldName] = documentContent.text
aDocument.contents = tempContents
*/
tempContents = {}
tempFieldName = getCurrentDocumentKey(aDocument.contents)
tempContents[tempFieldName] = documentContent.text
aDocument.contents = tempContents
}
}
Tabs {
id: tabs
Tab {
title: i18n.tr("Hello U1Db!")
page: Page {
id: helloPage
/*! Here a rectangle is defined that represents the lower portion of our application. It will contain all the main parts of the application.
Rectangle {
width: units.gu(45)
height: units.gu(70)
anchors.bottom: parent.bottom
color: "#00FFFFFF"
// The remainder of the main part of the application goes here ...
}
*/
Rectangle {
width: units.gu(45)
height: units.gu(70)
anchors.bottom: parent.bottom
color: "#00FFFFFF"
Rectangle {
width: units.gu(45)
height: units.gu(60)
anchors.bottom: parent.bottom
/*!
The following TextArea is for displaying contents for the current state of the global document, as defined by the key / name in the address bar.
TextArea{
id: documentContent
selectByMouse : false
x: units.gu(1)
y: units.gu(1)
width: units.gu(43)
height: units.gu(58)
color: "#000000"
}
*/
TextArea{
id: documentContent
selectByMouse : false
x: units.gu(1)
y: units.gu(1)
width: units.gu(43)
height: units.gu(58)
color: "#000000"
}
}
// This rectangle contains our navigation controls
Rectangle {
width: units.gu(43)
height: units.gu(5)
anchors.top: addressBarArea.bottom
x: units.gu(1.5)
color: "#00FFFFFF"
Row{
width: units.gu(43)
height: units.gu(5)
anchors.verticalCenter: parent.verticalCenter
spacing: units.gu(2)
Button {
text: "<"
onClicked: updateContentWindow(switchToPreviousDocument(aDocument), addressBar.text)
}
Button {
text: "Home"
onClicked: updateContentWindow(getCurrentDocumentKey(aDocument.contents),'helloworld')
}
Button {
text: "Save"
onClicked: updateContentWindow(getCurrentDocumentKey(aDocument.contents),addressBar.text)
}
Button {
text: ">"
onClicked: updateContentWindow(switchToNextDocument(aDocument), addressBar.text)
}
}
}
Rectangle {
id: addressBarArea
width: units.gu(45)
height: units.gu(5)
anchors.top: parent.top
TextField {
id: addressBar
width: units.gu(43)
anchors.verticalCenter: parent.verticalCenter
x: units.gu(1)
hasClearButton: false
/*!
There is an object within in the 'aDocument' model defined earlier called 'contents', which contains a key called 'helloworld', which represents a search string. In our example the key will represent the name of a document in the database, which will be displayed in the address bar. Displaying the key is demonstrated here:
text: displayKey(aDocument.contents)
function displayKey(documentObject){
var keys = Object.keys(documentObject);
return keys[0]
}
*/
text: getCurrentDocumentKey(aDocument.contents)
onAccepted: {
onClicked: updateContentWindow(getCurrentDocumentKey(aDocument.contents),addressBar.text)
}
}
}
}
}
}
}
}
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