- Qt 5.5
- Qt Sensors
- Qt Sensors - SensorGesture QML Type example
- Button.qml Example File
- Qt 5.5.1 Reference Documentation

# Button.qml Example File

qmlsensorgestures/Button.qml

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the QtSensors module 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 The Qt Company Ltd 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 the declarative plugins
    import QtQuick 2.0

    //Implementation of the Button control.
    Item {
        id: button
        width: 30
        height: 30
        property alias buttonText: innerText.text;
        property color color: "white"
        property color hoverColor: "#aaaaaa"
        property color pressColor: "slategray"
        property int fontSize: 10
        property int borderWidth: 1
        property int borderRadius: 2
        scale: state === "Pressed" ? 0.96 : 1.0
        onEnabledChanged: state = ""
        signal clicked

        //define a scale animation
        Behavior on scale {
            NumberAnimation {
                duration: 100
                easing.type: Easing.InOutQuad
            }
        }

        //Rectangle to draw the button
        Rectangle {
            id: rectangleButton
            anchors.fill: parent
            radius: borderRadius
            color: button.enabled ? button.color : "grey"
            border.width: borderWidth
            border.color: "black"

            Text {
                id: innerText
                font.pointSize: fontSize
                anchors.centerIn: parent
            }
        }

        //change the color of the button in differen button states
        states: [
            State {
                name: "Hovering"
                PropertyChanges {
                    target: rectangleButton
                    color: hoverColor
                }
            },
            State {
                name: "Pressed"
                PropertyChanges {
                    target: rectangleButton
                    color: pressColor
                }
            }
        ]

        //define transmission for the states
        transitions: [
            Transition {
                from: ""; to: "Hovering"
                ColorAnimation { duration: 200 }
            },
            Transition {
                from: "*"; to: "Pressed"
                ColorAnimation { duration: 10 }
            }
        ]

        //Mouse area to react on click events
        MouseArea {
            hoverEnabled: true
            anchors.fill: button
            onEntered: { button.state='Hovering'}
            onExited: { button.state=''}
            onClicked: { button.clicked();}
            onPressed: { button.state="Pressed" }
            onReleased: {
                if (containsMouse)
                  button.state="Hovering";
                else
                  button.state="";
            }
        }
    }