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/*****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtQuick.Dialogs module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 Digia Plc and its Subsidiary(-ies) 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 2.1
import QtQuick.Dialogs 1.0
import QtQuick.Window 2.1
import Qt.labs.folderlistmodel 2.0
import "qml"

AbstractFileDialog {
    id: root
    onVisibleChanged: {
        if (visible) {
            selectedIndices = []
            lastClickedIdx = -1
            currentPathField.visible = false
        }
    }

    property bool showFocusHighlight: false
    property real textX: titleBar.height
    property SystemPalette palette
    property var selectedIndices: []
    property int lastClickedIdx: -1
    folder: urlToPath(view.model.folder)

    function dirDown(path) {
        view.model.folder = path
        lastClickedIdx = -1
        selectedIndices = []
    }
    function dirUp() {
        view.model.folder = view.model.parentFolder
        lastClickedIdx = -1
        selectedIndices = []
    }
    function up(extend) {
        if (view.currentIndex > 0)
            --view.currentIndex
        else
            view.currentIndex = 0
        if (extend) {
            if (selectedIndices.indexOf(view.currentIndex) < 0) {
                var selCopy = selectedIndices
                selCopy.push(view.currentIndex)
                selectedIndices = selCopy
            }
        } else
            selectedIndices = [view.currentIndex]
    }
    function down(extend) {
        if (view.currentIndex < view.model.count - 1)
            ++view.currentIndex
        else
            view.currentIndex = view.model.count - 1
        if (extend) {
            if (selectedIndices.indexOf(view.currentIndex) < 0) {
                var selCopy = selectedIndices
                selCopy.push(view.currentIndex)
                selectedIndices = selCopy
            }
        } else
            selectedIndices = [view.currentIndex]
    }
    function acceptSelection() {
        clearSelection()
        if (selectFolder && selectedIndices.length == 0)
            addSelection(folder)
        else {
            selectedIndices.map(function(idx) {
                if (view.model.isFolder(idx)) {
                    if (selectFolder)
                        addSelection(view.model.get(idx, "filePath"))
                } else {
                    if (!selectFolder)
                        addSelection(view.model.get(idx, "filePath"))
                }
            })
        }
        accept()
    }

    Rectangle {
        property int maxSize: Math.min(Screen.desktopAvailableWidth, Screen.desktopAvailableHeight)
        // TODO: QTBUG-29817 geometry from AbstractFileDialog
        implicitWidth: Math.min(maxSize, Screen.logicalPixelDensity * 100)
        implicitHeight: Math.min(maxSize, Screen.logicalPixelDensity * 80)
        id: window
        color: palette.window

        SystemPalette { id: palette }

        Component {
            id: folderDelegate
            Rectangle {
                id: wrapper
                function launch() {
                    if (view.model.isFolder(index)) {
                        dirDown(filePath)
                    } else {
                        root.acceptSelection()
                    }
                }
                width: window.width
                height: nameText.implicitHeight * 1.5
                color: "transparent"
                Rectangle {
                    id: itemHighlight
                    visible: root.selectedIndices.indexOf(index) >= 0
                    anchors.fill: parent
                    color: palette.highlight
                }
                Image {
                    id: icon
                    source: "images/folder.png"
                    height: wrapper.height - y * 2; width: height
                    x: (root.textX - width) / 2
                    y: 2
                    visible: view.model.isFolder(index)
                }
                Text {
                    id: nameText
                    anchors.fill: parent; verticalAlignment: Text.AlignVCenter
                    text: fileName
                    anchors.leftMargin: root.textX
                    color: itemHighlight.visible ? palette.highlightedText : palette.windowText
                    elide: Text.ElideRight
                }
                MouseArea {
                    id: mouseRegion
                    anchors.fill: parent
                    onDoubleClicked: {
                        selectedIndices = [index]
                        root.lastClickedIdx = index
                        launch()
                    }
                    onClicked: {
                        view.currentIndex = index
                        if (mouse.modifiers & Qt.ControlModifier && root.selectMultiple) {
                            // modifying the contents of selectedIndices doesn't notify,
                            // so we have to re-assign the variable
                            var selCopy = selectedIndices
                            var existingIdx = selCopy.indexOf(index)
                            if (existingIdx >= 0)
                                selCopy.splice(existingIdx, 1)
                            else
                                selCopy.push(index)
                            selectedIndices = selCopy
                        } else if (mouse.modifiers & Qt.ShiftModifier && root.selectMultiple) {
                            if (root.lastClickedIdx >= 0) {
                                var sel = []
                                if (index > lastClickedIdx) {
                                    for (var i = root.lastClickedIdx; i <= index; i++)
                                        sel.push(i)
                                } else {
                                    for (var i = root.lastClickedIdx; i >= index; i--)
                                        sel.push(i)
                                }
                                selectedIndices = sel
                            }
                        } else {
                            selectedIndices = [index]
                            root.lastClickedIdx = index
                        }
                    }
                }
            }
        }

        ListView {
            id: view
            anchors.top: titleBar.bottom
            anchors.bottom: bottomBar.top
            clip: true
            x: 0
            width: parent.width
            model: FolderListModel { }
            delegate: folderDelegate
            highlight: Rectangle {
                color: "transparent"
                border.color: Qt.darker(palette.window, 1.3)
            }
            highlightMoveDuration: 0
            highlightMoveVelocity: -1
            focus: !currentPathField.visible
            Keys.onPressed: {
                event.accepted = true
                switch (event.key) {
                case Qt.Key_Up:
                    root.up(event.modifiers & Qt.ShiftModifier && root.selectMultiple)
                    break
                case Qt.Key_Down:
                    root.down(event.modifiers & Qt.ShiftModifier && root.selectMultiple)
                    break
                case Qt.Key_Left:
                    root.dirUp()
                    break
                case Qt.Key_Return:
                case Qt.Key_Select:
                case Qt.Key_Right:
                    if (view.currentItem)
                        view.currentItem.launch()
                    else
                        root.acceptSelection()
                    break
                default:
                    // do nothing
                    event.accepted = false
                    break
                }
            }
        }

        MouseArea {
            anchors.fill: view
            enabled: currentPathField.visible
            onClicked: currentPathField.visible = false
        }


        Item {
            id: titleBar
            width: parent.width
            height: currentPathField.height * 1.5
            Rectangle {
                anchors.fill: parent
                color: Qt.darker(palette.window, 1.1)
                border.color: Qt.darker(palette.window, 1.3)
            }
            Rectangle {
                id: upButton
                width: root.textX
                height: titleBar.height
                color: "transparent"

                Image {
                    id: upButtonImage
                    anchors.centerIn: parent; source: "images/up.png"
                }
                MouseArea { id: upRegion; anchors.centerIn: parent
                    width: 56
                    height: parent.height
                    onClicked: if (view.model.parentFolder != "") dirUp()
                }
                states: [
                    State {
                        name: "pressed"
                        when: upRegion.pressed
                        PropertyChanges { target: upButton; color: palette.highlight }
                    }
                ]
            }
            Text {
                id: currentPathText
                anchors.left: parent.left; anchors.right: parent.right; anchors.verticalCenter: parent.verticalCenter
                anchors.leftMargin: textX; anchors.rightMargin: 4
                text: root.urlToPath(view.model.folder)
                color: palette.text
                elide: Text.ElideLeft; horizontalAlignment: Text.AlignRight; verticalAlignment: Text.AlignVCenter
                MouseArea {
                    anchors.fill: parent
                    onClicked: currentPathField.visible = true
                }
            }
            TextField {
                id: currentPathField
                anchors.left: parent.left; anchors.right: parent.right; anchors.verticalCenter: parent.verticalCenter
                anchors.leftMargin: textX; anchors.rightMargin: 4
                visible: false
                focus: visible
                text: root.urlToPath(view.model.folder)
                onAccepted: {
                    root.clearSelection()
                    if (root.addSelection(text))
                        root.accept()
                    else
                        view.model.folder = root.pathFolder(text)
                }
                onDownPressed: currentPathField.visible = false
            }
        }
        Rectangle {
            id: bottomBar
            width: parent.width
            height: buttonRow.height + buttonRow.spacing * 2
            anchors.bottom: parent.bottom
            color: Qt.darker(palette.window, 1.1)
            border.color: Qt.darker(palette.window, 1.3)

            Row {
                id: buttonRow
                anchors.right: parent.right
                anchors.rightMargin: spacing
                anchors.verticalCenter: parent.verticalCenter
                spacing: 4
                TextField {
                    id: filterField
                    text: root.selectedNameFilter
                    visible: !selectFolder
                    width: bottomBar.width - cancelButton.width - okButton.width - parent.spacing * 5
                    anchors.verticalCenter: parent.verticalCenter
                    onAccepted: {
                        root.selectNameFilter(text)
                        view.model.nameFilters = text
                    }
                }
                Button {
                    id: cancelButton
                    text: "Cancel"
                    onClicked: root.reject()
                }
                Button {
                    id: okButton
                    text: "OK"
                    onClicked: {
                        if (view.model.isFolder(view.currentIndex) && !selectFolder)
                            dirDown(view.model.get(view.currentIndex, "filePath"))
                        else
                            root.acceptSelection()
                    }
                }
            }
        }
    }
}