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Rewrite workerscript example
Clearer function, arguable justification for using WorkerScript, and
fits better into the standrad form factor.

Change-Id: I3f29f19961a12adc29b260b3284eb620ad63bf45
Reviewed-by: Chris Adams <christopher.adams@nokia.com>
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Alan Alpert authored and Qt by Nokia committed Mar 20, 2012
1 parent 760d0ac commit 61b2c91
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Showing 3 changed files with 141 additions and 33 deletions.
87 changes: 87 additions & 0 deletions examples/quick/threading/workerscript/Spinner.qml
@@ -0,0 +1,87 @@
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

import QtQuick 2.0

Rectangle {
width: 64
height: 64
property alias value: list.currentIndex
property alias label: caption.text

Text {
id: caption
text: "Spinner"
anchors.horizontalCenter: parent.horizontalCenter
}

Rectangle {
anchors.top: caption.bottom
anchors.topMargin: 4
anchors.horizontalCenter: parent.horizontalCenter
height: 48
width: 32
color: "black"
ListView {
id: list
anchors.fill: parent
highlightRangeMode: ListView.StrictlyEnforceRange
preferredHighlightBegin: height/3
preferredHighlightEnd: height/3
clip: true
model: 64
delegate: Text {
font.pixelSize: 18;
color: "white";
text: index;
anchors.horizontalCenter: parent.horizontalCenter
}
}
Rectangle {
anchors.fill: parent
gradient: Gradient {
GradientStop { position: 0.0; color: "#FF000000" }
GradientStop { position: 0.2; color: "#00000000" }
GradientStop { position: 0.8; color: "#00000000" }
GradientStop { position: 1.0; color: "#FF000000" }
}
}
}
}
31 changes: 20 additions & 11 deletions examples/quick/threading/workerscript/workerscript.js
@@ -1,15 +1,24 @@
var lastx = 0;
var lasty = 0;
//Will be initialized when WorkerScript{} is instantiated
var cache = new Array(64);
for (var i = 0; i < 64; i++)
cache[i] = new Array(64);

WorkerScript.onMessage = function(message) {
var ydiff = message.y - lasty;
var xdiff = message.x - lastx;

var total = Math.sqrt(ydiff * ydiff + xdiff * xdiff);

lastx = message.x;
lasty = message.y;
function triangle(row, column) {
if (cache[row][column])
return cache[row][column]
if (column < 0 || column > row)
return -1;
if (column == 0 || column == row)
return 1;
return triangle(row-1, column-1) + triangle(row-1, column);
}

WorkerScript.sendMessage( {xmove: xdiff, ymove: ydiff, move: total} );
WorkerScript.onMessage = function(message) {
//Calculate result (may take a while, using a naive algorithm)
var calculatedResult = triangle(message.row, message.column);
//Send result back to main thread
WorkerScript.sendMessage( { row: message.row,
column: message.column,
result: calculatedResult} );
}

56 changes: 34 additions & 22 deletions examples/quick/threading/workerscript/workerscript.qml
Expand Up @@ -41,43 +41,55 @@
import QtQuick 2.0

Rectangle {
width: 480; height: 320
width: 320; height: 480

WorkerScript {
id: myWorker
source: "workerscript.js"

onMessage: {
console.log("Moved " + messageObject.xmove + " along the X axis.");
console.log("Moved " + messageObject.ymove + " along the Y axis.");
console.log("Moved " + messageObject.move + " pixels.");
if (messageObject.row == rowSpinner.value && messageObject.column == columnSpinner.value){ //Not an old result
if (messageObject.result == -1)
resultText.text = "Column must be <= Row";
else
resultText.text = messageObject.result;
}
}
}
Row {
y: 24
spacing: 24
anchors.horizontalCenter: parent.horizontalCenter
Spinner {
id: rowSpinner
label: "Row"
onValueChanged: {
resultText.text = "Loading...";
myWorker.sendMessage( { row: rowSpinner.value, column: columnSpinner.value } );
}
}

Rectangle {
width: 200; height: 200
anchors.left: parent.left; anchors.leftMargin: 20
color: "red"

MouseArea {
anchors.fill: parent
onClicked: myWorker.sendMessage( { rectangle: "red", x: mouse.x, y: mouse.y } );
Spinner {
id: columnSpinner
label: "Column"
onValueChanged: {
resultText.text = "Loading...";
myWorker.sendMessage( { row: rowSpinner.value, column: columnSpinner.value } );
}
}
}

Rectangle {
width: 200; height: 200
anchors.right: parent.right; anchors.rightMargin: 20
color: "blue"

MouseArea {
anchors.fill: parent
onClicked: myWorker.sendMessage( { rectangle: "blue", x: mouse.x, y: mouse.y } );
}
Text {
id: resultText
y: 180
width: parent.width
horizontalAlignment: Text.AlignHCenter
wrapMode: Text.WordWrap
font.pixelSize: 32
}

Text {
text: "Click a Rectangle!"
text: "Pascal's Triangle Calculator"
anchors { horizontalCenter: parent.horizontalCenter; bottom: parent.bottom; bottomMargin: 50 }
}
}

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