Blinking flashing increasing brightness of backlight in WRT
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| − | + | [[Category:Symbian Web Runtime]][[Category:Code Examples]][[Category:Hardware]][[Category:S60 3rd Edition FP1]][[Category:S60 3rd Edition FP2]][[Category:S60 5th Edition]][[Category:Base/System]] | |
{{ArticleMetaData <!-- v1.2 --> | {{ArticleMetaData <!-- v1.2 --> | ||
|sourcecode= [[Media:Blinking flashing increasing brightness of backlight in WRT.zip]] | |sourcecode= [[Media:Blinking flashing increasing brightness of backlight in WRT.zip]] | ||
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|author= [[User:Dekuykin]] | |author= [[User:Dekuykin]] | ||
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==Overview== | ==Overview== | ||
| − | This code snippet demonstrates how to control the backlight of a device | + | {{Abstract|This code snippet demonstrates how to control the backlight of a device on Symbian Web Runtime, using the SystemInfo Service API WRT version 1.0. }} |
The API is supported from S60 3rd Edition, Feature Pack 2 onwards. It is also supported in select S60 3rd Edition, Feature Pack 1 devices or their newest firmware versions (for example, Nokia E90 Communicator, from v.210.34.75 onwards). | The API is supported from S60 3rd Edition, Feature Pack 2 onwards. It is also supported in select S60 3rd Edition, Feature Pack 1 devices or their newest firmware versions (for example, Nokia E90 Communicator, from v.210.34.75 onwards). | ||
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For a complete example that makes use of the SystemInfo Service API to control the backlight, see [[Media:Blinking flashing increasing brightness of backlight in WRT.zip|Blinking flashing increasing brightness of backlight in WRT.zip]] | For a complete example that makes use of the SystemInfo Service API to control the backlight, see [[Media:Blinking flashing increasing brightness of backlight in WRT.zip|Blinking flashing increasing brightness of backlight in WRT.zip]] | ||
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Latest revision as of 09:41, 5 October 2012
Article Metadata
Code Example
Tested with
Devices(s): Nokia E90 Communicator (v.210.34.75 and later), Nokia 5800 XpressMusic
Compatibility
Platform(s): S60 3rd Edition, FP2, S60 5th Edition
Article
Keywords: x-systeminfo-widget, SystemInfo.lightblink(), SystemInfo.lighton()
Created: dekuykin
(10 Dec 2008)
Last edited: hamishwillee
(05 Oct 2012)
Contents |
Overview
This code snippet demonstrates how to control the backlight of a device on Symbian Web Runtime, using the SystemInfo Service API WRT version 1.0.
The API is supported from S60 3rd Edition, Feature Pack 2 onwards. It is also supported in select S60 3rd Edition, Feature Pack 1 devices or their newest firmware versions (for example, Nokia E90 Communicator, from v.210.34.75 onwards).
Source
Embed the SystemInfo widget into the document:
<body>
<embed type="application/x-systeminfo-widget" hidden="yes" />
</body>
Add three buttons to control the backlight:
<input type="button" onclick="lightOn();" value="Light on" />
<input type="button" onclick="blink();" value="Blink" />
<input type="button" onclick="lightOff();" value="Light off" />
The JavaScript code:
var sysInfo = null;
window.onload = init;
var SMOOTH = true;
function init() {
// Obtain the SystemInfo object
try {
sysInfo = document.embeds[0];
} catch (ex) {
alert("SystemInfo object cannot be found.");
return;
}
}
// Switches the display light on
function lightOn() {
if (sysInfo == undefined) {
alert("SystemInfo object is undefined.");
return;
}
// Reset the backlight state to default
resetLight();
sysInfo.lighton(sysInfo.lighttargetsystem, sysInfo.lightinfiniteduration,
sysInfo.lightmaxintensity, SMOOTH);
}
// Starts blinking the display
function blink() {
if (sysInfo == undefined) {
alert("SystemInfo object is undefined.");
return;
}
// Reset the backlight state to default
resetLight();
sysInfo.lightblink(sysInfo.lighttargetsystem,
sysInfo.lightinfiniteduration, sysInfo.lightdefaultcycletime,
sysInfo.lightdefaultcycletime, sysInfo.lightmaxintensity);
}
// Switches the display light off
function lightOff() {
if (sysInfo == undefined) {
alert("SystemInfo object is undefined.");
return;
}
sysInfo.lightoff(sysInfo.lighttargetsystem, sysInfo.lightinfiniteduration,
SMOOTH);
}
// Sets the backlight of the display to default value
function resetLight() {
if (sysInfo == undefined) {
alert("SystemInfo object is undefined.");
return;
}
sysInfo.lighton(sysInfo.lighttargetsystem, sysInfo.lightinfiniteduration,
sysInfo.lightdefaultintensity, SMOOTH);
}
Postconditions
Different possibilities to control the backlight are demonstrated.
Supplementary material
For a complete example that makes use of the SystemInfo Service API to control the backlight, see Blinking flashing increasing brightness of backlight in WRT.zip
