Map reference scale

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
// [WriteFile Name=MapReferenceScale, Category=Maps]
// [Legal]
// Copyright 2019 Esri.

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// [Legal]

import QtQuick
import Esri.ArcGISRuntime
import QtQuick.Controls
import QtQuick.Layouts

Rectangle {
    id: rootRectangle
    clip: true
    width: 800
    height: 600

    readonly property var referenceScales: [500000, 250000, 100000, 50000]
    readonly property string webMapId: "3953413f3bd34e53a42bf70f2937a408"
    property LayerListModel featureLayerModel

    MapView {
        id: mapView
        anchors.fill: parent

        Component.onCompleted: {
            // Set the focus on MapView to initially enable keyboard navigation
            forceActiveFocus();
        }

        // Create a Map from a Portal Item
        Map {
            id: map

            PortalItem {
                id: mapPortalItem
                portal: portal
                itemId: webMapId
                onErrorChanged: {
                    console.log("Error in portal item: %1(%2)".arg(error.message).arg(error.additionalMessage));
                }
                onLoadStatusChanged: {
                    if (loadStatus === Enums.LoadStatusLoaded) {
                        //load operational layers into listmodel
                        featureLayerModel = map.operationalLayers;
                    }
                }
            }
        }
    }

    Rectangle {
        anchors {
            margins: 5
            left: parent.left
            top: parent.top
        }
        width: childrenRect.width
        height: childrenRect.height
        color: "#000000"
        opacity: .75
        radius: 5

        ColumnLayout {
            Text {
                color: "#ffffff"
                text: "Current Map Scale 1:%1".arg(Math.round(mapView.mapScale))
                Layout.fillWidth: true
                Layout.margins: 3
                font {
                    weight: Font.DemiBold
                    pointSize: 10
                }
            }

            Text {
                color: "#ffffff"
                text: qsTr("Select a new reference scale")
                Layout.fillWidth: true
                Layout.margins: 3
                font {
                    weight: Font.DemiBold
                    pointSize: 10
                }
            }

            ComboBox {
                id: scales
                font {
                    weight: Font.DemiBold
                    pointSize: 10
                }
                Layout.margins: 3
                Layout.fillWidth: true
                model: ["1:500000","1:250000","1:100000","1:50000"]
                Component.onCompleted: applyReferenceScaleToMap();
                onActivated: applyReferenceScaleToMap();
            }

            Button {
                text: qsTr("Set Map Scale to Reference Scale")
                font {
                    weight: Font.DemiBold
                    pointSize: 10
                }
                Layout.margins: 3
                Layout.fillWidth: true
                onClicked: mapView.setViewpointScale(referenceScales[scales.currentIndex]);
            }
        }
    }

    Rectangle {
        anchors {
            margins: 5
            right: parent.right
            top: parent.top
        }
        width: childrenRect.width
        height: childrenRect.height
        color: "#000000"
        opacity: .75
        radius: 5

        ColumnLayout {
            Text {
                text: qsTr("Apply Reference Scale")
                horizontalAlignment: Text.AlignHCenter
                Layout.fillWidth: true
                Layout.margins: 2
                font {
                    weight: Font.DemiBold
                    pointSize: 10
                }
                color: "#ffffff"
            }

            Repeater {
                id: featureLayerRepeater
                // Assign the model to the list model of operational layers
                model: featureLayerModel
                width: childrenRect.width
                height: childrenRect.height

                // Assign the delegate to display text next to checkbox as a row
                delegate: Row {
                    CheckBox {
                        id: featureLayerBox
                        checked: true
                        onCheckStateChanged: featureLayerScaleSymbols(name,featureLayerBox.checked);
                    }
                    Text {
                        id: featureLayerText
                        text: name
                        height: featureLayerBox.height
                        verticalAlignment: Text.AlignVCenter
                        font.pointSize: 10
                        color: "#ffffff"
                    }
                }
            }
        }
    }

    function applyReferenceScaleToMap() {
        map.referenceScale = referenceScales[scales.currentIndex];
    }

    //pass in layers name and checked status to update featurelayer.ScaleSymbols property accordingly
    function featureLayerScaleSymbols(layerName, checkedStatus) {
        featureLayerModel.forEach(lyr => {
            if(layerName === lyr.name){
                lyr.scaleSymbols = checkedStatus;
            }
        })
    }
}