- Qt 5.3
- Qt Multimedia
- QML Video Example
- main.qml Example File
- Qt 5.3.2 Reference Documentation

# main.qml Example File

video/qmlvideo/qml/qmlvideo/main.qml

    /****************************************************************************
    **
    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the Qt Mobility Components.
    **
    ** $QT_BEGIN_LICENSE:LGPL$
    ** 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 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.LGPL included in the
    ** packaging of this file.  Please review the following information to
    ** ensure the GNU Lesser General Public License version 2.1 requirements
    ** will be met: 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.
    **
    ** GNU General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU
    ** General Public License version 3.0 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.  Please review the following information to
    ** ensure the GNU General Public License version 3.0 requirements will be
    ** met: http://www.gnu.org/copyleft/gpl.html.
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    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    import QtQuick 2.0

    Rectangle {
        id: root
        width: 640
        height: 360
        color: "black"

        property string source1
        property string source2
        property color bgColor: "#002244"
        property real volume: 0.25
        property bool perfMonitorsLogging: false
        property bool perfMonitorsVisible: false

        QtObject {
            id: d
            property int itemHeight: 40
            property int buttonHeight: 0.8 * itemHeight
            property int margins: 10
        }

        // Create ScreenSaver element via Loader, so this app will still run if the
        // SystemInfo module is not available
        Loader {
            source: "DisableScreenSaver.qml"
        }

        Loader {
            id: performanceLoader

            Connections {
                target: inner
                onVisibleChanged:
                    if (performanceLoader.item)
                        performanceLoader.item.enabled = !inner.visible
                ignoreUnknownSignals: true
            }

            function init() {
                console.log("[qmlvideo] performanceLoader.init logging " + root.perfMonitorsLogging + " visible " + root.perfMonitorsVisible)
                var enabled = root.perfMonitorsLogging || root.perfMonitorsVisible
                source = enabled ? "../performancemonitor/PerformanceItem.qml" : ""
            }

            onLoaded: {
                item.parent = root
                item.anchors.fill = root
                item.logging = root.perfMonitorsLogging
                item.displayed = root.perfMonitorsVisible
                item.enabled = false
                item.init()
            }
        }

        Rectangle {
            id: inner
            anchors.fill: parent
            color: root.bgColor

            Button {
                id: openFile1Button
                anchors {
                    top: parent.top
                    left: parent.left
                    right: exitButton.left
                    margins: d.margins
                }
                height: d.buttonHeight
                text: (root.source1 == "") ? "Select file 1" : root.source1
                onClicked: fileBrowser1.show()
            }

            Button {
                id: openFile2Button
                anchors {
                    top: openFile1Button.bottom
                    left: parent.left
                    right: exitButton.left
                    margins: d.margins
                }
                height: d.buttonHeight
                text: (root.source2 == "") ? "Select file 2" : root.source2
                onClicked: fileBrowser2.show()
            }

            Button {
                id: exitButton
                anchors {
                    top: parent.top
                    right: parent.right
                    margins: d.margins
                }
                width: 50
                height: d.buttonHeight
                text: "Exit"
                onClicked: Qt.quit()
            }

            SceneSelectionPanel {
                id: sceneSelectionPanel
                itemHeight: d.itemHeight
                color: "#004444"
                anchors {
                    top: openFile2Button.bottom
                    left: parent.left
                    right: parent.right
                    bottom: parent.bottom
                    margins: d.margins
                }
                radius: 10
                onSceneSourceChanged: {
                    console.log("[qmlvideo] main.onSceneSourceChanged source " + sceneSource)
                    sceneLoader.source = sceneSource
                    var scene = null
                    var innerVisible = true
                    if (sceneSource == "") {
                        if (performanceLoader.item)
                            performanceLoader.item.videoActive = false
                    } else {
                        scene = sceneLoader.item
                        if (scene) {
                            if (scene.contentType === "video" && source1 === "") {
                                errorDialog.show("You must first select a video file")
                                sceneSource = ""
                            } else {
                                scene.parent = root
                                scene.color = root.bgColor
                                scene.buttonHeight = d.buttonHeight
                                scene.source1 = source1
                                scene.source2 = source2
                                scene.volume = volume
                                scene.anchors.fill = root
                                scene.close.connect(closeScene)
                                scene.content.initialize()
                                innerVisible = false
                            }
                        }
                    }
                    videoFramePaintedConnection.target = scene
                    inner.visible = innerVisible
                }
            }
        }

        Loader {
            id: sceneLoader
        }

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

        FileBrowser {
            id: fileBrowser1
            anchors.fill: root
            onFolderChanged: fileBrowser2.folder = folder
            Component.onCompleted: fileSelected.connect(root.openFile1)
        }

        FileBrowser {
            id: fileBrowser2
            anchors.fill: root
            onFolderChanged: fileBrowser1.folder = folder
            Component.onCompleted: fileSelected.connect(root.openFile2)
        }

        function openFile1(path) {
            root.source1 = path
        }

        function openFile2(path) {
            root.source2 = path
        }

        ErrorDialog {
            id: errorDialog
            anchors.fill: parent
            enabled: false
        }

        // Called from main() once root properties have been set
        function init() {
            performanceLoader.init()
            fileBrowser1.folder = videoPath
            fileBrowser2.folder = videoPath
        }

        function qmlFramePainted() {
            if (performanceLoader.item)
                performanceLoader.item.qmlFramePainted()
        }

        function closeScene() {
            console.log("[qmlvideo] main.closeScene")
            sceneSelectionPanel.sceneSource = ""
        }
    }