Content.qml Example File | Qt Multimedia 5.4

- Qt 5.4
- Qt Multimedia
- QML Video Shader Effects Example
- Content.qml Example File
- Qt 5.4.2 Reference Documentation

# Content.qml Example File

video/qmlvideofx/qml/qmlvideofx/Content.qml

    /****************************************************************************
    **
    ** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the Qt Mobility Components.
    **
    ** $QT_BEGIN_LICENSE:LGPL21$
    ** 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 Digia. For licensing terms and
    ** conditions see http://qt.digia.com/licensing. For further information
    ** use the contact form at http://qt.digia.com/contact-us.
    **
    ** GNU Lesser General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU Lesser
    ** General Public License version 2.1 or version 3 as published by the Free
    ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
    ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
    ** following information to ensure the GNU Lesser General Public License
    ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
    ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    **
    ** In addition, as a special exception, Digia gives you certain additional
    ** rights. These rights are described in the Digia Qt LGPL Exception
    ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    import QtQuick 2.1

    Rectangle {
        id: root
        property alias effect: effectLoader.item
        property alias gripSize: divider.gripSize
        property string effectSource
        property real volume: 0.5

        signal videoFramePainted

        Divider {
            id: divider
            visible: false
            z: 1.0
            onValueChanged: updateDivider()
        }

        ShaderEffectSource {
            id: theSource
            smooth: true
            hideSource: true
        }

        Loader {
            id: contentLoader
        }

        Loader {
            id: effectLoader
            source: effectSource
        }

        Connections {
            id: videoFramePaintedConnection
            onFramePainted: {
                if (performanceLoader.item)
                   root.videoFramePainted()
            }
            ignoreUnknownSignals: true
        }

        onWidthChanged: {
            if (effectLoader.item)
                effectLoader.item.targetWidth = root.width
        }

        onHeightChanged: {
            if (effectLoader.item)
                effectLoader.item.targetHeight = root.height
        }

        onEffectSourceChanged: {
            effectLoader.source = effectSource
            effectLoader.item.parent = root
            effectLoader.item.targetWidth = root.width
            effectLoader.item.targetHeight = root.height
            updateSource()
            effectLoader.item.source = theSource
            divider.visible = effectLoader.item.divider
            updateDivider()
        }

        function init() {
            openImage("qrc:/images/qt-logo.png")
            root.effectSource = "EffectPassThrough.qml"
        }

        function updateDivider() {
            if (effectLoader.item && effectLoader.item.divider)
                effectLoader.item.dividerValue = divider.value
        }

        function updateSource() {
            if (contentLoader.item) {
                contentLoader.item.parent = root
                contentLoader.item.anchors.fill = root
                theSource.sourceItem = contentLoader.item
                if (effectLoader.item)
                    effectLoader.item.anchors.fill = contentLoader.item
            }
        }

        function openImage(path) {
            stop()
            contentLoader.source = "ContentImage.qml"
            videoFramePaintedConnection.target = null
            contentLoader.item.source = path
            updateSource()
        }

        function openVideo(path) {
            stop()
            contentLoader.source = "ContentVideo.qml"
            videoFramePaintedConnection.target = contentLoader.item
            contentLoader.item.mediaSource = path
            contentLoader.item.volume = volume
            contentLoader.item.play()
            updateSource()
        }

        function openCamera() {
            stop()
            contentLoader.source = "ContentCamera.qml"
            videoFramePaintedConnection.target = contentLoader.item
            updateSource()
        }

        function stop() {
            if (contentLoader.source == "ContentVideo.qml")
                contentLoader.item.stop()
            theSource.sourceItem = null
        }
    }