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/*=====================================================================

 QGroundControl Open Source Ground Control Station

 (c) 2009 - 2015 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>

 This file is part of the QGROUNDCONTROL project

 QGROUNDCONTROL 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.

 QGROUNDCONTROL 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 QGROUNDCONTROL. If not, see <http://www.gnu.org/licenses/>.

 ======================================================================*/

/// @file
///     @author Don Gagne <don@thegagnes.com>

import QtQuick 2.3
import QtQuick.Controls 1.3
import QtQuick.Dialogs 1.2

import QGroundControl.Controls 1.0
import QGroundControl.Palette 1.0
import QGroundControl.ScreenTools 1.0
import QGroundControl.FactSystem 1.0
import QGroundControl.FactControls 1.0

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FactPanel {
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    id: __rootItem

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    property var qgcView:               __rootItem  ///< Used by Fact controls for validation dialogs
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    property bool completedSignalled:   false
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    property real topDialogMargin:      0           ///< Set a top margin for dialog
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    property var viewPanel
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    /// This is signalled when the top level Item reaches Component.onCompleted. This allows
    /// the view subcomponent to connect to this signal and do work once the full ui is ready
    /// to go.
    signal completed

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    function __setupDialogButtons(buttons) {
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        __acceptButton.visible = false
        __rejectButton.visible = false

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        // Accept role buttons
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        if (buttons & StandardButton.Ok) {
            __acceptButton.text = "Ok"
            __acceptButton.visible = true
        } else if (buttons & StandardButton.Open) {
            __acceptButton.text = "Open"
            __acceptButton.visible = true
        } else if (buttons & StandardButton.Save) {
            __acceptButton.text = "Save"
            __acceptButton.visible = true
        } else if (buttons & StandardButton.Apply) {
            __acceptButton.text = "Apply"
            __acceptButton.visible = true
        } else if (buttons & StandardButton.Open) {
            __acceptButton.text = "Open"
            __acceptButton.visible = true
        } else if (buttons & StandardButton.SaveAll) {
            __acceptButton.text = "Save All"
            __acceptButton.visible = true
        } else if (buttons & StandardButton.Yes) {
            __acceptButton.text = "Yes"
            __acceptButton.visible = true
        } else if (buttons & StandardButton.YesToAll) {
            __acceptButton.text = "Yes to All"
            __acceptButton.visible = true
        } else if (buttons & StandardButton.Retry) {
            __acceptButton.text = "Retry"
            __acceptButton.visible = true
        } else if (buttons & StandardButton.Reset) {
            __acceptButton.text = "Reset"
            __acceptButton.visible = true
        } else if (buttons & StandardButton.RestoreToDefaults) {
            __acceptButton.text = "Restore to Defaults"
            __acceptButton.visible = true
        } else if (buttons & StandardButton.Ignore) {
            __acceptButton.text = "Ignore"
            __acceptButton.visible = true
        }
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        // Reject role buttons
        if (buttons & StandardButton.Cancel) {
            __rejectButton.text = "Cancel"
            __rejectButton.visible = true
        } else if (buttons & StandardButton.Close) {
            __rejectButton.text = "Cancel"
            __rejectButton.visible = true
        } else if (buttons & StandardButton.No) {
            __rejectButton.text = "No"
            __rejectButton.visible = true
        } else if (buttons & StandardButton.NoToAll) {
            __rejectButton.text = "No to All"
            __rejectButton.visible = true
        } else if (buttons & StandardButton.Abort) {
            __rejectButton.text = "Abort"
            __rejectButton.visible = true
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        } else if (buttons & StandardButton.Reset) {
            __rejectButton.text = "Reset"
            __rejectButton.visible = true
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        }
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    }

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    function __stopAllAnimations() {
        if (__animateHideDialog.running) {
            __animateHideDialog.stop()
        }
    }

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    function __checkForEarlyDialog(title) {
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        if (!completedSignalled) {
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            console.warn("showDialog|Message called before QGCView.completed signalled", title)
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        }
    }

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    /// Shows a QGCViewDialog component
    ///     @param compoent QGCViewDialog component
    ///     @param title Title for dialog
    ///     @param charWidth Width of dialog in characters (-1 for full parent width)
    ///     @param buttons Buttons to show in dialog using StandardButton enum
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    function showDialog(component, title, charWidth, buttons) {
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        if (__checkForEarlyDialog(title)) {
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            return
        }

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        __stopAllAnimations()

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        __dialogCharWidth = charWidth
        __dialogTitle = title

        __setupDialogButtons(buttons)
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        __dialogComponent = component
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        viewPanel.enabled = false
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        __dialogOverlay.visible = true
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        __animateShowDialog.start()
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    }

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    function showMessage(title, message, buttons) {
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        if (__checkForEarlyDialog(title)) {
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            return
        }

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        __stopAllAnimations()

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        __dialogCharWidth = 50
        __dialogTitle = title
        __messageDialogText = message

        __setupDialogButtons(buttons)

        __dialogComponent = __messageDialog
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        viewPanel.enabled = false
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        __dialogOverlay.visible = true
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        __animateShowDialog.start()
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    }

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    function hideDialog() {
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        viewPanel.enabled = true
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        __animateHideDialog.start()
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    }

    QGCPalette { id: __qgcPal; colorGroupEnabled: true }
    QGCLabel { id: __textMeasure; text: "X"; visible: false }

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    property real defaultTextHeight: __textMeasure.contentHeight
    property real defaultTextWidth:  __textMeasure.contentWidth
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    /// The width of the dialog panel in characters
    property int __dialogCharWidth: 75

    /// The title for the dialog panel
    property string __dialogTitle

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    property string __messageDialogText

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    property Component __dialogComponent

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    function __signalCompleted() {
        // When we use this control inside a QGCQmlWidgetHolder Component.onCompleted is signalled
        // before the width and height are adjusted. So we need to wait for width and heigth to be
        // set before we signal our own completed signal.
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        if (!completedSignalled && width != 0 && height != 0) {
            completedSignalled = true
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            completed()
        }
    }

    Component.onCompleted:  __signalCompleted()
    onWidthChanged:         __signalCompleted()
    onHeightChanged:        __signalCompleted()
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    Connections {
        target: __dialogComponentLoader.item

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        onHideDialog: __rootItem.hideDialog()
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    }

    Item {
        id:             __dialogOverlay
        visible:        false
        anchors.fill:   parent
        z:              5000

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        readonly property int __animationDuration: 200

        ParallelAnimation {
            id: __animateShowDialog


            NumberAnimation {
                target:     __transparentSection
                properties: "opacity"
                from:       0.0
                to:         0.8
                duration:   __dialogOverlay.__animationDuration
            }

            NumberAnimation {
                target:     __transparentSection
                properties: "width"
                from:       __dialogOverlay.width
                to:         __dialogOverlay.width - __dialogPanel.width
                duration:   __dialogOverlay.__animationDuration
            }
        }

        ParallelAnimation {
            id: __animateHideDialog

            NumberAnimation {
                target:     __transparentSection
                properties: "opacity"
                from:       0.8
                to:         0.0
                duration:   __dialogOverlay.__animationDuration
            }

            NumberAnimation {
                target:     __transparentSection
                properties: "width"
                from:       __dialogOverlay.width - __dialogPanel.width
                to:         __dialogOverlay.width
                duration:   __dialogOverlay.__animationDuration
            }

            onRunningChanged: {
                if (!running) {
                    __dialogComponent = null
                    __dialogOverlay.visible = false
                }
            }
        }

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        // This covers the parent with an transparent section
        Rectangle {
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            id:             __transparentSection
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            anchors.top:    parent.top
            anchors.bottom: parent.bottom
            anchors.left:   parent.left
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            width:          parent.width
            opacity:        0.0
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            color:          __qgcPal.window
        }

        // This is the main dialog panel which is anchored to the right edge
        Rectangle {
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            id:                 __dialogPanel
            width:              __dialogCharWidth == -1 ? parent.width : defaultTextWidth * __dialogCharWidth
            anchors.topMargin:  topDialogMargin
            anchors.top:        parent.top
            anchors.bottom:     parent.bottom
            anchors.left:       __transparentSection.right
            color:              __qgcPal.windowShadeDark
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            Rectangle {
                id:     __header
                width:  parent.width
                height: __acceptButton.height
                color:  __qgcPal.windowShade

                function __hidePanel() {
                    __fullPanel.visible = false
                }

                QGCLabel {
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                    x:                  defaultTextWidth
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                    height:             parent.height
                    verticalAlignment:	Text.AlignVCenter
                    text:               __dialogTitle
                }

                QGCButton {
                    id:             __rejectButton
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                    anchors.right:  __acceptButton.visible ?  __acceptButton.left : parent.right
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                    anchors.bottom: parent.bottom

                    onClicked: __dialogComponentLoader.item.reject()
                }

                QGCButton {
                    id:             __acceptButton
                    anchors.right:  parent.right
                    primary:        true

                    onClicked: __dialogComponentLoader.item.accept()
                }
            }

            Item {
                id:             __spacer
                width:          10
                height:         10
                anchors.top:    __header.bottom
            }

            Loader {
                id:                 __dialogComponentLoader
                anchors.margins:    5
                anchors.left:       parent.left
                anchors.right:      parent.right
                anchors.top:        __spacer.bottom
                anchors.bottom:     parent.bottom
                sourceComponent:    __dialogComponent
            }
        } // Rectangle - Dialog panel
    } // Item - Dialog overlay
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    Component {
        id: __messageDialog

        QGCViewMessage {
            message: __messageDialogText
        }
    }
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}