Qt/QT_Assistant/QDesktop-fb/calculator/Calbutton.qml

/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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 QtQuick 2.0

Item {
    id: button
    property alias text: textItem.text
    property color color: "#eceeea"
    property color btnBg: "#333333"

    property bool operator: false
    property bool dimmable: false
    property bool dimmed: false
    property bool backSpaceDisplay: false
    property real btnOpacity: 1

    width:(calculator.width/* - 4 * 16*/) / 5
    height: smallScreen ? 42 : 80
    Rectangle {
        color: btnBg
        width: parent.width
        height:parent.height
        anchors.centerIn: parent
//        radius: parent.width / 2
        opacity: btnOpacity
        Image {
            anchors.centerIn: parent
            width: 50
            height: 40
            id: backSpaceIcon
            source: backSpaceDisplay ? "qrc:/calculator/images/backspace.png" : ""
        }
    }

    Text {
        id: textItem
        font.pixelSize: 30
        font.bold: true
        wrapMode: Text.WordWrap
        anchors.centerIn: parent
        //lineHeight: 0.75
        opacity: btnOpacity
        color: (dimmable && dimmed) ? Qt.darker(button.color) : button.color
        Behavior on color { ColorAnimation { duration: 120; easing.type: Easing.OutElastic} }
        states: [
            State {
                name: "pressed"
                when: mouse.pressed && !dimmed
                PropertyChanges {
                    target: textItem
                    color: Qt.lighter(button.color)
                }
            }
        ]
    }

    MouseArea {
        id: mouse
        anchors.fill: parent
        anchors.margins: -5
        onClicked: {
            if (operator)
                calculator.operatorPressed(parent.text)
            else
                calculator.digitPressed(parent.text)
        }
        onPressed: btnOpacity = 0.5
        onReleased: btnOpacity = 1
    }

    function updateDimmed() {
        dimmed = calculator.isButtonDisabled(button.text)
    }

    Component.onCompleted: {
        numPad.buttonPressed.connect(updateDimmed)
        updateDimmed()
    }
}