Commit 61b2c919 authored by Alan Alpert's avatar Alan Alpert Committed by Qt by Nokia

Rewrite workerscript example

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

Change-Id: I3f29f19961a12adc29b260b3284eb620ad63bf45
Reviewed-by: 's avatarChris Adams <christopher.adams@nokia.com>
parent 760d0ac2
/****************************************************************************
**
** 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
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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****************************************************************************/
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" }
}
}
}
}
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} );
}
......@@ -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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