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/*
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 * Copyright (C) 2014-2017 CZ.NIC
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 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations including
 * the two.
 */

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import QtQuick 2.7
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import QtQuick.Controls 2.1
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import QtQuick.Window 2.1
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import QtQuick.Layouts 1.3
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import QtQuick.Dialogs 1.2
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import QtQuick.Controls.Material 2.1
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import cz.nic.mobileDatovka 1.0
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ApplicationWindow {

    // Get deafult color theme and palette from system
    SystemPalette { id: datovkaPalette; colorGroup: SystemPalette.Active }
    id: mainWindow
    visible: true
    title: "Datovka"
    width: 800
    height: 600
    color: datovkaPalette.window

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    // This element set default font (size) and must be hidden. Font is used
    // accross application as default font size. Do not remove it.
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    Text {
        id: defaultTextFont
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        visible: false
        text: "Note: set default font"
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    }

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    // Set default material design from system palette
    Material.theme: Material.System
    Material.background: datovkaPalette.base
    Material.foreground: datovkaPalette.text
    Material.primary: datovkaPalette.alternateBase
    Material.accent: datovkaPalette.highlight

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    // define all pages for stackview
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    property Component pageAboutApp: PageAboutApp {}
    property Component pageAccountDetail: PageAccountDetail {}
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    property Component pageChangePassword: PageChangePassword {}
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    property Component pageMenuAccount: PageMenuAccount {}
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    property Component pageMenuDatovkaSettings: PageMenuDatovkaSettings {}
    property Component pageMenuMessage: PageMenuMessage {}
    property Component pageMenuMessageDetail: PageMenuMessageDetail {}
    property Component pageMenuMessageList: PageMenuMessageList {}
    property Component pageMessageDetail: PageMessageDetail {}
    property Component pageMessageList: PageMessageList {}
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    property Component pageMessageSearch: PageMessageSearch {}
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    property Component pageSettingsAccount: PageSettingsAccount {}
    property Component pageSettingsGeneral: PageSettingsGeneral {}
    property Component pageSettingsPin: PageSettingsPin {}
    property Component pageSettingsStorage: PageSettingsStorage {}
    property Component pageSettingsSync: PageSettingsSync {}
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    // header background color
    property string mainHeaderBgColor: "#00539b"
    property int statusBarTimer: 5000
    // dimension and style based on font pixel size and screen dpi
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    property int textFontSizeInPixels: defaultTextFont.font.pixelSize
    property int textPointSmall: Math.round(defaultTextFont.font.pointSize * 0.7)
    property int textFontSizeSmall: if (textPointSmall > 0) {textPointSmall} else {8}
    property int headerHeight: textFontSizeInPixels * 3
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    property int imgHeight: headerHeight * 0.8
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    // inputItemHeight holds height of controls elements computed from font size
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    property int inputItemHeight: headerHeight
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    property int navImgHeight: headerHeight * 0.3
    property int listItemHeight: headerHeight * 1.5
    property int defaultMargin: Math.round(Screen.pixelDensity)
    property int acntListSpacing: defaultMargin * 2
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    property int formItemVerticalSpacing: defaultMargin
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    property int formButtonHorizontalSpacing: defaultMargin * 5
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    /* compare message delivery date with current date-90days */
    property int deleteAfterDays: 90
    function compareMsgDate(msgDeliveryTime) {
        if (msgDeliveryTime == "") {
            // message has virus or delivery time missing
            return true
        } else {
            // convert qml date format to ISO date format
            var inputDateFormat = /(\d{2})\.(\d{2})\.(\d{4})/;
            var msgDate = new Date(msgDeliveryTime.replace(inputDateFormat,'$3-$2-$1'));
            var today = new Date()
            today.setDate(today.getDate()-deleteAfterDays)
            // compare both dates in milliseconds
            return (today.getTime() > msgDate.getTime())
        }
    }

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    /* Exposes nested stack to code outside the page component. */
    property var nestedStack: null

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    /* Password/OTP input dialog, emitted from C++ */
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    InputDialogue {
        id: inputDialog
        onFinished: {
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            isds.returnInputDialogText(isdsAction, pwdType, userName, pwd)
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        }
        Connections {
            target: isds
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            onOpenDialogRequest: {
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                 inputDialog.openInputDialog(isdsAction, pwdType, userName, title, text, placeholderText, hidePwd)
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            }
        }
    }

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    StackView { // Page area.
        id: mainStack
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        anchors.fill: parent
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        initialItem: appArea

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        Item {
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            id: appArea
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            objectName: "appArea"
            anchors.fill: parent
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            StackView.onActivated: {
                mainStack.forceActiveFocus()
            }
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            Item { /* Application page stack. */
                id: mainPage
                anchors.fill: parent
                visible: true
                StackView {
                    id: pageView
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                    anchors.fill: parent
                    visible: true
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                    initialItem: PageAccountList {}

                    Component.onCompleted: {
                        nestedStack = pageView
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                    }
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                }
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            }
            Rectangle {
                id: statusBar
                visible: false
                anchors.left: parent.left
                anchors.bottom: parent.bottom
                anchors.right: parent.right
                height: headerHeight * 0.5
                color: datovkaPalette.alternateBase
                BusyIndicator {
                    id: busyuIndicator
                    width: parent.height
                    height: parent.height
                    anchors.centerIn: parent
                    running: false
                }
                Text {
                    id: statusBarText
                    color: datovkaPalette.text
                    anchors.centerIn: parent
                    text: mainWindow.width + " x "+ mainWindow.height
                    Connections {
                    target: isds
                        onStatusBarTextChanged: {
                            statusBar.visible = isVisible
                            statusBarText.text = txt
                            busyuIndicator.running = busy
                            timerId.running = !busy
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                        }
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                    }
                    Connections {
                        target: files
                        onStatusBarTextChanged: {
                            statusBar.visible = true
                            statusBarText.text = txt
                            busyuIndicator.running = busy
                            timerId.running = !busy
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                        }
                    }
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                    Connections {
                        target: settings
                        onStatusBarTextChanged: {
                            statusBar.visible = true
                            statusBarText.text = txt
                            busyuIndicator.running = busy
                            timerId.running = !busy
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                        }
                    }
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                }
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                Timer {
                    id: timerId
                    interval: statusBarTimer;
                    running: false;
                    repeat: false
                    onTriggered: {
                        timerId.running = false
                        statusBar.visible = false
                        statusBarText.text = ""
                    }
                }
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            }
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        }
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        Component { /* Pin lock screen. */
            id: lockScreen
            Rectangle  {
                objectName: "lockScreen"
                anchors.fill: parent
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                color: datovkaPalette.base
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                Column {
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                    anchors.centerIn: parent
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                    spacing: formItemVerticalSpacing
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                    TextField {
                        id: pinCodeInput
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                        height: inputItemHeight
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                        font.pointSize: defaultTextFont.font.pointSize
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                        //focus: true // Forcing focus here causes troubles on mobile devices.
                        echoMode: TextInput.Password
                        passwordMaskDelay: 500 // milliseconds
                        inputMethodHints: Qt.ImhDigitsOnly
                        placeholderText: qsTr("Enter PIN code")
                        anchors.horizontalCenter: parent.horizontalCenter
                        horizontalAlignment: TextInput.AlignHCenter
                        function verifyPin() {
                            settings.verifyPin(pinCodeInput.text.toString())
                        }
                        onEditingFinished: {
                            // This function is called repeatedly when switching
                            // windows. The condition should reduce PIN verification
                            // calls.
                            if (pinCodeInput.text.length > 0) {
                                verifyPin()
                            }
                        }
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                    }
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                    Text {
                        id: wrongPin
                        font.bold: true
                        visible: false
                        color: datovkaPalette.text
                        anchors.horizontalCenter: parent.horizontalCenter
                        text: qsTr("Wrong PIN code!")
                    }
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                    Button {
                        text: qsTr("Enter")
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                        anchors.horizontalCenter: parent.horizontalCenter
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                        font.pointSize: defaultTextFont.font.pointSize
                        height: inputItemHeight
                        onClicked: {
                            pinCodeInput.verifyPin()
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                        }
                    }
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                    Item {
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                        id: blankField
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                        width: parent.width
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                        height: headerHeight
                        anchors.horizontalCenter: parent.horizontalCenter
                    }
                    Image{
                        id: datovkaLogo
                        anchors.horizontalCenter: parent.horizontalCenter
                        width: imgHeight * 1.4
                        height: imgHeight * 1.4
                        source: "qrc:/datovka.png"
                    }
                    Text {
                        id: versionLabel
                        anchors.horizontalCenter: parent.horizontalCenter
                        color: datovkaPalette.text
                        text: qsTr("Version") + ": " + settings.appVersion()
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                    }
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                } // Column
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                Connections {
                    target: settings
                    onSendPinReply: {
                        if (success) {
                            Qt.inputMethod.hide()
                            if (mainStack.currentItem.objectName == "lockScreen") {
                                mainStack.pop(StackView.Immediate)
                            }
                        }
                        wrongPin.visible = !success
                        pinCodeInput.text = ""
                    }
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                } // Connections
            } // Rectangle
        } // Component
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        Connections {
            target: locker
            onLockApp: {
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                if (mainStack.currentItem.objectName == "appArea") {
                    /* Lock application area. */
                    mainStack.push(lockScreen, StackView.Immediate)
                }
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            }
        }
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        Connections {
            target: interactionZfoFile
            onDisplayZfoFileContent: {
                /*
                 * The app should be locked from within C++ code when PIN is
                 * enabled.
                 */
                console.log("Showing zfo file: " + filePath)
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                var fileContent = files.rawFileContent(filePath)
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                mainStack.push(pageMessageDetail, {
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                        "pageView": mainStack,
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                        "fromLocalDb": false,
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                        "rawZfoContent": fileContent
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                    }, StackView.Immediate)
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                /*
                 * Next function has effect only for iOS.
                 * Detail info is in the header file.
                 */
                files.deleteTmpFileFromStorage(filePath)
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            }
        }
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        Connections {
            target: dlgEmitter
            onDlgGetText: {
                /*
                 * Create a dynamic dialogue object set content and connect
                 * functionality.
                 */

                var dlgComponent = Qt.createComponent("qrc:/qml/dialogues/PasteInputDialogue.qml", Component.PreferSynchronous);
                var dlgObj;
                if (dlgComponent.status == Component.Ready) {
                    finishCreation();
                } else {
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                    console.log("Failed loading dlgComponent:", dlgComponent.errorString());
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                    dlgComponent.statusChanged.connect(finishCreation);
                }

                function finishCreation() {
                    if (dlgComponent.status == Component.Error) {
                        // Error handling.
                        console.log("Error loading dlgComponent:", dlgComponent.errorString());
                        return;
                    } else if (dlgComponent.status != Component.Ready) {
                        return;
                    }

                    dlgObj = dlgComponent.createObject(mainWindow, {"objectName": "textInputDialogue"});
                    if (dlgObj == null) {
                        // Error handling.
                        console.log("Error creating dialogue object");
                        return;
                    }

                    dlgObj.dialogue.title = title
                    dlgObj.dialogue.content.messageText.text = message
                    dlgObj.dialogue.content.textInput.inputMethodHints = inputMethodHints /* Must be set before setting echoMode. */
                    dlgObj.dialogue.dlgEchoMode = echoMode
                    dlgObj.dialogue.content.textInput.text = text
                    dlgObj.dialogue.content.textInput.placeholderText = placeholderText
                    dlgObj.dialogue.explicitPasteMenu = explicitPasteMenu

                    /* See PasteInputDialogue.qml for explanation. */
                    dlgObj.dialogue.standardButtons = StandardButton.Ok | StandardButton.Cancel

                    /* Connect signals. */
                    dlgObj.dialogueClosed.connect(deleteObject);
                    dlgObj.dialogue.accepted.connect(emitAccepted);
                    dlgObj.dialogue.rejected.connect(emitRejected);

                    dlgObj.dialogue.open();
                }

                function deleteObject() {
                    console.log("Destroying dialogue.");
                    dlgObj.destroy();

                    mainStack.forceActiveFocus(); /* Dialogue stole focus. */
                }

                function emitAccepted() {
                    console.log("Accepted " + dlgObj.dialogue.content.textInput.text);
                    dlgEmitter.emitAccepted(dlgObj.dialogue.content.textInput.text);
                }

                function emitRejected() {
                    console.log("Rejected");
                    dlgEmitter.emitRejected();
                }
            }
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            onDlgMessage: {
                /*
                 * Create a dynamic dialogue object set content and connect
                 * functionality.
                 */

                var dlgComponent = Qt.createComponent("qrc:/qml/dialogues/MessageDialogue.qml", Component.PreferSynchronous);
                var dlgObj;
                if (dlgComponent.status == Component.Ready) {
                    finishCreation();
                } else {
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                    console.log("Failed loading dlgComponent:", dlgComponent.errorString());
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                    dlgComponent.statusChanged.connect(finishCreation);
                }

                function finishCreation() {
                    if (dlgComponent.status == Component.Error) {
                        // Error handling.
                        console.log("Error loading dlgComponent:", dlgComponent.errorString());
                        return;
                    } else if (dlgComponent.status != Component.Ready) {
                        return;
                    }

                    dlgObj = dlgComponent.createObject(mainWindow, {"objectName": "messageDialogue"});
                    if (dlgObj == null) {
                        // Error handling.
                        console.log("Error creating dialogue object");
                        return;
                    }

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                    dlgObj.dialogue.icon = icon
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                    dlgObj.dialogue.title = title
                    dlgObj.dialogue.content.messageText.text = message
                    dlgObj.dialogue.content.infoMessageText.text = infoMessage
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                    dlgObj.dialogue.dlgButtons = buttons
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                    /* Connect signals. */
                    dlgObj.dialogueClosed.connect(gatherDataAndDeleteObject);

                    dlgObj.dialogue.open();
                }

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                function gatherDataAndDeleteObject(button, customButton) {
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                    /* TODO -- Gather pressed button value. */
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                    dlgEmitter.emitClosed(button, customButton)
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                    console.log("Destroying dialogue.");
                    dlgObj.destroy();

                    mainStack.forceActiveFocus(); /* Dialogue stole focus. */
                }

                function emitClosed() {
                    console.log("Closed");
                    dlgEmitter.emitClosed(1, -1);
                }
            }
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        }

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        function navigateBack(mainStack, nestedStack, event) {
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            if (event.key === Qt.Key_Back) {
                event.accepted = true
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                if (nestedStack == null) {
                    return
                }

                if (mainStack.currentItem.objectName == "lockScreen") {
                    console.log("Ignoring back button on lock screen.")
                } else if (mainStack.depth > 1) {
                    mainStack.pop(StackView.Immediate)
                } else if (nestedStack.depth > 1) {
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                    nestedStack.pop()
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                } else {
                    event.accepted = false
                    Qt.quit()
                }
            }
        }
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        /* Android back button. */
        focus: true
        Keys.onReleased: {
            navigateBack(mainStack, nestedStack, event)
        }
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    }
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    /* We can loose the focus to StackView if any Menu or Popup is opened */
    function resetFocus() {
        pageView.focus = true
    }

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    Text {
        id: dummyText
        text: ""
        visible: false
        wrapMode: Text.NoWrap
        elide: Text.ElideNone
    }
    function computeMenuWidth(menu) {
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        var w = 0.0
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        for (var i = 0; i < menu.contentData.length; i++) {
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            dummyText.text = menu.contentData[i].text + "www"
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            if (w < dummyText.width) {
                w = dummyText.width
            }
        }
        dummyText.text = ""
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        return Math.round(w)
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    }
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}