flashlight.qml Example File

    /* Copyright (c) 2012, 2013  BlackBerry Limited.
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.apache.org/licenses/LICENSE-2.0
    *
    * Unless required by applicable law or agreed to in writing, software
    * distributed under the License is distributed on an "AS IS" BASIS,
    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    * See the License for the specific language governing permissions and
    * limitations under the License.
    */

    import bb.cascades 1.0
    import QtMobility.sensors 1.2
    import Flashlight 1.0

    Container {
        topPadding: 20
        leftPadding: 20
        rightPadding: 20

        attachedObjects: [
            Flashlight {
                id: flashlight
            },

            Gyroscope {
                id: accel

                // Create a variable to count the number of sensor readings
                property int count: 0

                // Turn on the sensor
                active: true

                // Don't change sensor axis on screen rotation
                axesOrientationMode: Gyroscope.FixedOrientation

                // Keep the sensor active when the app isn't visible or the screen is off (requires app permission in bar-descriptor)
                alwaysOn: true

                // If the device isn't moving (x&y&z==0), don't send updates, saves power
                skipDuplicates: true

                onReadingChanged: { // Called when a gyroscope reading is available
                    // Check whether rotation on Z axis is above the configured threshold
                    if (reading.z > gyroSlider.value.toFixed() * 360 / (2 * 3.14)) {
                        if (count > 5 && ambLight.val < lightDropDown.selectedIndex) {
                            // If after 5 readings the ambient light is darker than the configured threshold, toggle the flash light
                            count = 0
                            flashlight.enabled = ! flashlight.enabled;
                        }
                    }
                    count ++;
                }
            },

            AmbientLightSensor {
                id: ambLight

                // Create a variable to hold the ambient light value
                property variant val: AmbientLightSensor.Undefined

                // Turn on the sensor
                active: true

                // Keep the sensor active when the app isn't visible or the screen is off (requires app permission in bar-descriptor)
                alwaysOn: true

                // If the device isn't moving (x&y&z==0), don't send updates, saves power
                skipDuplicates: true

                onReadingChanged: { // Called when an ambient light reading is available
                    val = reading.lightLevel;
                    if (ambLight.val >= lightDropDown.selectedIndex && flashlight.enabled) {
                        // Switch off the flash light if current ambient light is brigther than configured threshold
                        flashlight.enabled = false;
                    }
                }
            },

            LightSensor {
                id: light

                // Create a variable to hold the ambient light value
                property real val: 0

                // Turn on the sensor
                active: true

                // Keep the sensor active when the app isn't visible or the screen is off (requires app permission in bar-descriptor)
                alwaysOn: true

                // If the device isn't moving (x&y&z==0), don't send updates, saves power
                skipDuplicates: true

                onReadingChanged: { // Called when an light reading is available
                    val = reading.lux;
                }
            }
        ]

        TextArea {
            text: qsTr("To enable the flash light give the device a clockwise flick with an angular velocity greater then 'Gyro Threshold'. The flashlight is only enabled in environments darker then 'Light Threshold'. The flashlight will automatically turn off in enviroments brighter then 'Light Threshold'.")
        }

        Label {
            text: {
                if (light.val == AmbientLightReading.Dark) {
                    return qsTr("Light: Dark");
                } else if (light.val == AmbientLightReading.Twilight) {
                    return qsTr("Light: Twilight");
                } else if (light.val == AmbientLightReading.Light) {
                    return qsTr("Light: Light");
                } else if (light.val == AmbientLightReading.Bright) {
                    return qsTr("Light: Bright");
                } else if (light.val == AmbientLightReading.Sunny) {
                    return qsTr("Light: Sunny");
                } else {
                    return qsTr("Light: Undefined");
                }
            }
        }

        DropDown {
            id: lightDropDown
            title: qsTr("Light Threshold")

            Option {
                text: qsTr("Undefined")
            }
            Option {
                text: qsTr("Dark")
            }
            Option {
                text: qsTr("Twilight")
                selected: true
            }
            Option {
                text: qsTr("Light")
            }
            Option {
                text: qsTr("Bright")
            }
            Option {
                text: qsTr("Sunny")
            }
        }

        Label {
            topMargin: 50

            text: qsTr("Gyro Threshold: %1").arg(gyroSlider.value.toFixed())
        }

        Slider {
            id: gyroSlider
            value: 10
            fromValue: 0
            toValue: 50
        }

        Label {
            horizontalAlignment: HorizontalAlignment.Center

            text: qsTr("Luminosity: %1 lux").arg(Math.round(light.val))
            textStyle {
                base: SystemDefaults.TextStyles.TitleText
                color: Color.White
                lineHeight: 2
            }
        }
    }