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**
** Copyright (C) 2015 The Qt Company Ltd.
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** This file is part of the Qt Quick Dialogs module of the Qt Toolkit.
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import QtQuick 2.2
import QtQuick.Controls 1.2
import QtQuick.Controls.Private 1.0 as ControlsPrivate
import QtQuick.Dialogs 1.1
import QtQuick.Dialogs.Private 1.1
import QtQuick.Layouts 1.1
import QtQuick.Window 2.1
import Qt.labs.folderlistmodel 2.1
import Qt.labs.settings 1.0
import "qml"

AbstractFileDialog {
    id: root

    Component {
        id: modelComponent
        FolderListModel {
            showFiles: !root.selectFolder
            nameFilters: root.selectedNameFilterExtensions
            sortField: (view.sortIndicatorColumn === 0 ? FolderListModel.Name :
                        (view.sortIndicatorColumn === 1 ? FolderListModel.Type :
                        (view.sortIndicatorColumn === 2 ? FolderListModel.Size : FolderListModel.LastModified)))
            sortReversed: view.sortIndicatorOrder === Qt.DescendingOrder
        }
    }

    onVisibleChanged: {
        if (visible) {
            // If the TableView doesn't have a model yet, create it asynchronously to avoid a UI freeze
            if (!view.model) {
                var incubator = modelComponent.incubateObject(null, { })
                function init(model) {
                    console.log(model.folder,root.folder)
                    model.folder = root.folder
                    view.model = model
                    model.nameFilters = root.selectedNameFilterExtensions
                    root.folder = model.folder
                }

                if (incubator.status === Component.Ready) {
                    init(incubator.object)
                } else {
                    incubator.onStatusChanged = function(status) {
                        if (status === Component.Ready)
                            init(incubator.object)
                    }
                }
            }

            view.needsWidthAdjustment = true
            view.selection.clear()
            view.focus = true
        }
    }

    Component.onCompleted: {
        filterField.currentIndex = root.selectedNameFilterIndex
    }

    property Settings settings: Settings {
        category: "QQControlsFileDialog"
        property alias width: root.width
        property alias height: root.height
    }

    property bool showFocusHighlight: false
    property SystemPalette palette: SystemPalette { }

    function dirDown(path) {
        view.selection.clear()
        root.folder = "file://" + path
    }
    function dirUp() {
        view.selection.clear()
        if (view.model.parentFolder != "")
            root.folder = view.model.parentFolder
    }
    function acceptSelection() {
        // transfer the view's selections to QQuickFileDialog
        clearSelection()
        if (selectFolder && view.selection.count === 0)
            addSelection(folder)
        else {
            view.selection.forEach(function(idx) {
                if (view.model.isFolder(idx)) {
                    if (selectFolder)
                        addSelection(view.model.get(idx, "fileURL"))
                } else {
                    if (!selectFolder)
                        addSelection(view.model.get(idx, "fileURL"))
                }
            })
        }
        accept()
    }

    property Action dirUpAction: Action {
        text: "\ue810"
        shortcut: "Ctrl+U"
        onTriggered: dirUp()
        tooltip: qsTr("Go up to the folder containing this one")
    }

    Rectangle {
        id: window
        implicitWidth: Math.min(root.__maximumDimension, Math.max(Screen.pixelDensity * 100, splitter.implicitWidth))
        implicitHeight: Math.min(root.__maximumDimension, Screen.pixelDensity * 80)
        color: root.palette.window

        Binding {
            target: view.model
            property: "folder"
            value: root.folder
        }
        Binding {
            target: currentPathField
            property: "text"
            value: root.urlToPath(root.folder)
        }
        Keys.onPressed: {
            event.accepted = true
            switch (event.key) {
            case Qt.Key_Back:
            case Qt.Key_Escape:
                reject()
                break
            default:
                event.accepted = false
                break
            }
        }
        Keys.forwardTo: [view.flickableItem]

        SplitView {
            id: splitter
            x: 0
            width: parent.width
            anchors.top: titleBar.bottom
            anchors.bottom: bottomBar.top

            TableView {
                id: view
                width: parent.width
                sortIndicatorVisible: true
                Layout.fillWidth: true
                Layout.minimumWidth: 40
                property bool needsWidthAdjustment: true
                selectionMode: root.selectMultiple ?
                    (ControlsPrivate.Settings.hasTouchScreen ? SelectionMode.MultiSelection : SelectionMode.ExtendedSelection) :
                    SelectionMode.SingleSelection
                onRowCountChanged: if (needsWidthAdjustment && rowCount > 0) {
                    resizeColumnsToContents()
                    needsWidthAdjustment = false
                }
                model: null

                onActivated: if (view.focus) {
                    if (view.selection.count > 0 && view.model.isFolder(row)) {
                        dirDown(view.model.get(row, "filePath"))
                    } else {
                        root.acceptSelection()
                    }
                }
                onClicked: currentPathField.text = view.model.get(row, "filePath")


                TableViewColumn {
                    id: fileNameColumn
                    role: "fileName"
                    title: qsTr("Filename")
                    delegate: Item {
                        implicitWidth: view.width
                        IconGlyph {
                            id: fileIcon
                            x: 4
                            height: parent.height - 2
                            unicode: view.model.isFolder(styleData.row) ? "\ue804" : "\ue802"
                        }
                        Text {
                            id: pathText
                            text: styleData.value
                            anchors {
                                left: parent.left
                                right: parent.right
                                leftMargin: fileIcon.width + 6
                                rightMargin: 4
                                verticalCenter: parent.verticalCenter
                            }
                            color: styleData.textColor
                            elide: Text.ElideRight
                            renderType: ControlsPrivate.Settings.isMobile ? Text.QtRendering : Text.NativeRendering
                        }
                    }
                }
                /*
                TableViewColumn {
                    role: "fileSuffix"
                    title: qsTr("Type", "file type (extension)")
                    // TODO should not need to create a whole new component just to customize the text value
                    // something like textFormat: function(text) { return view.model.get(styleData.row, "fileIsDir") ? "folder" : text }
                    delegate: Item {
                        implicitWidth: sizeText.implicitWidth + sizeText.anchors.leftMargin + sizeText.anchors.rightMargin
                        Text {
                            id: sizeText
                            text: view.model.get(styleData.row, "fileIsDir") ? "folder" : styleData.value
                            anchors {
                                left: parent.left
                                right: parent.right
                                leftMargin: 4
                                rightMargin: 4
                                verticalCenter: parent.verticalCenter
                            }
                            color: styleData.textColor
                            elide: Text.ElideRight
                            renderType: ControlsPrivate.Settings.isMobile ? Text.QtRendering : Text.NativeRendering
                        }
                    }
                }
                TableViewColumn {
                    role: "fileSize"
                    title: qsTr("Size", "file size")
                    horizontalAlignment: Text.AlignRight
                }
                TableViewColumn { id: modifiedColumn; role: "fileModified" ; title: qsTr("Modified", "last-modified time") }
                TableViewColumn { id: accessedColumn; role: "fileAccessed" ; title: qsTr("Accessed", "last-accessed time") }
                */
            }
        }

        ToolBar {
            id: titleBar
            RowLayout {
                anchors.fill: parent
                ToolButton {
                    action: dirUpAction
                    style: IconButtonStyle { }
                    Layout.maximumWidth: height * 1.5
                }
                TextField {
                    id: currentPathField
                    Layout.fillWidth: true
                    function doAccept() {
                        root.clearSelection()
                        if (root.addSelection(root.pathToUrl(text)))
                            root.accept()
                        else
                            root.folder = root.pathFolder(text)
                    }
                    onAccepted: doAccept()
                }
            }
        }
        Item {
            id: bottomBar
            width: parent.width
            height: buttonRow.height + buttonRow.spacing * 2
            anchors.bottom: parent.bottom

            Row {
                id: buttonRow
                anchors.right: parent.right
                anchors.rightMargin: spacing
                anchors.verticalCenter: parent.verticalCenter
                spacing: 4
                ComboBox {
                    id: filterField
                    model: root.nameFilters
                    visible: !selectFolder
                    width: bottomBar.width - cancelButton.width - okButton.width - parent.spacing * 6
                    anchors.verticalCenter: parent.verticalCenter
                    onCurrentTextChanged: {
                        root.selectNameFilter(currentText)
                        if (view.model)
                            view.model.nameFilters = root.selectedNameFilterExtensions
                    }
                }
                Button {
                    id: cancelButton
                    text: qsTr("取消")
                    onClicked: root.reject()
                }
                Button {
                    id: okButton
                    text: root.selectFolder ? qsTr("确定") : (selectExisting ? qsTr("打开") : qsTr("保存"))
                    onClicked: {
                        if (view.model.isFolder(view.currentIndex) && !selectFolder)
                            dirDown(view.model.get(view.currentIndex, "filePath"))
                        else if (!(root.selectExisting))
                            currentPathField.doAccept()
                        else
                            root.acceptSelection()
                    }
                }
            }
        }
    }
}