Battery Indicator Example using Qt

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This is a good article on using Qt Mobility function Jim Gilmour

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Code Example

Source file: Media:BatteryIndicator.zip

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Article

Created: chintandave_er (14 Nov 2010)

Last edited: hamishwillee (03 May 2013)

Overview

This code example shows how to create simple basic 'Battery Indicator' application using QSystemDeviceInfo.

Note: This example uses a QWidget based UI (deprecated) and should be updated to use a QML based UI.

Header (batteryindicator.h)

#ifndef BATTERYINDICATOR_H
#define BATTERYINDICATOR_H
 
#include <QDialog>
//Include the System Info header file
#include <QSystemInfo>
 
QTM_USE_NAMESPACE
 
namespace Ui {
    class BatteryIndicator;
}
 
 
class BatteryIndicator : public QDialog
{
    Q_OBJECT
 
public:
    explicit BatteryIndicator(QWidget *parent = 0);
    ~BatteryIndicator();
 
private:
    Ui::BatteryIndicator *ui;
    void setupGeneral();
 
    QSystemDeviceInfo *deviceInfo;
};
 
#endif // BATTERYINDICATOR_H

Source (batteryindicator.cpp)

#include "batteryindicator.h"
#include "ui_batteryindicator.h"
 
//set initial values
BatteryIndicator::BatteryIndicator(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::BatteryIndicator),
    deviceInfo(NULL)
{
    ui->setupUi(this);
    setupGeneral();
 
}
 
BatteryIndicator::~BatteryIndicator()
{
    delete ui;
}
void BatteryIndicator::setupGeneral()
{
    //Create a QSystemDeviceInfo object and set its value
    deviceInfo = new QSystemDeviceInfo(this);
 
    ui->batteryLevelBar->setValue(deviceInfo->batteryLevel());
 
    //connect the signal to the setValue slot of the progress bar
    connect(deviceInfo, SIGNAL(batteryLevelChanged(int)),
            ui->batteryLevelBar, SLOT(setValue(int)));
 
}

UI File (BatteryIndicator.ui)

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>BatteryIndicator</class>
 <widget class="QDialog" name="BatteryIndicator">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>480</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>BatteryIndicator</string>
  </property>
  <widget class="QProgressBar" name="batteryLevelBar">
   <property name="geometry">
    <rect>
     <x>110</x>
     <y>110</y>
     <width>121</width>
     <height>291</height>
    </rect>
   </property>
   <property name="autoFillBackground">
    <bool>false</bool>
   </property>
   <property name="value">
    <number>24</number>
   </property>
   <property name="orientation">
    <enum>Qt::Vertical</enum>
   </property>
   <property name="textDirection">
    <enum>QProgressBar::TopToBottom</enum>
   </property>
  </widget>
  <widget class="QLabel" name="label">
   <property name="geometry">
    <rect>
     <x>120</x>
     <y>10</y>
     <width>161</width>
     <height>31</height>
    </rect>
   </property>
   <property name="autoFillBackground">
    <bool>false</bool>
   </property>
   <property name="lineWidth">
    <number>3</number>
   </property>
   <property name="midLineWidth">
    <number>3</number>
   </property>
   <property name="text">
    <string>Battery Indicator</string>
   </property>
   <property name="textFormat">
    <enum>Qt::RichText</enum>
   </property>
   <property name="wordWrap">
    <bool>true</bool>
   </property>
   <property name="textInteractionFlags">
    <set>Qt::LinksAccessibleByMouse</set>
   </property>
  </widget>
  <widget class="Line" name="line">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>40</y>
     <width>661</width>
     <height>16</height>
    </rect>
   </property>
   <property name="orientation">
    <enum>Qt::Horizontal</enum>
   </property>
  </widget>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <resources/>
 <connections/>
</ui>

Main File (main.cpp)

#include <QtGui/QApplication>
#include "batteryindicator.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    BatteryIndicator w;
 
    w.showFullScreen();
 
    return a.exec();
}

Project File (.pro File)

QT       += core gui
 
TARGET = BatteryIndicator
TEMPLATE = app
 
 
SOURCES += main.cpp\
        batteryindicator.cpp
 
HEADERS  += batteryindicator.h
 
FORMS    += batteryindicator.ui
 
#uses the System Info API
CONFIG += mobility
MOBILITY = systeminfo
 
symbian {
    TARGET.UID3 = 0xe1c86fe6
    # TARGET.CAPABILITY += 
    TARGET.EPOCSTACKSIZE = 0x14000
    TARGET.EPOCHEAPSIZE = 0x020000 0x800000
}

Postcondition

Here is one screenshot of the BatteryIndicator Apps.

Download Source Code

You can download source code from this link File:BatteryIndicator.zip.