Manage operational layers

View inQMLC++
View on GitHub
Sample viewer app

Add, remove, and reorder operational layers in a map.

screenshot

Use case

Operational layers display the primary content of the map and usually provide dynamic content for the user to interact with (as opposed to basemap layers that provide context).

The order of operational layers in a map determines the visual hierarchy of layers in the view. You can bring attention to a specific layer by rendering above other layers.

How to use the sample

When the app starts, a list displays the operational layers that are currently displayed in the map. Select the menu option on the list item to remove or reorder the layer. The map will be updated automatically.

The second list shows layers that have been removed from the map. Select the menu option on the list item to add it to the map.

How it works

  1. Get the operational layers LayerListModel from the map using Map::operationalLayers.
  2. Add or remove layers using operationalLayers()->append(layer) and operationalLayers()->remove(layer) respectively. The last layer in the list will be rendered on top.

Relevant API

  • Map
  • ArcGISMapImageLayer
  • LayerListModel
  • LayerListModel::append
  • LayerListModel::move
  • LayerListModel::removeAt

Tags

add, delete, layer, map, remove

Sample Code

ManageOperationalLayers.qmlDrawOrderLayerListModel.cppDrawOrderLayerListModel.hManageOperationalLayers.cppManageOperationalLayers.h
                                                                                                                                                                                                                               
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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
// [WriteFile Name=ManageOperationalLayers, Category=Layers]
// [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 2.6
import QtQuick.Controls 2.2
import QtQuick.Layouts 1.3
import Esri.Samples 1.0

Item {

    // add a mapView component
    MapView {
        id: view
        anchors.fill: parent
    }

    // Declare the C++ instance which creates the scene etc. and supply the view
    ManageOperationalLayersSample {
        id: sample
        mapView: view
    }

    Rectangle {
        anchors {
            fill: layerListColumn
            margins: -3
        }
        color: "#F5F5F5"
    }

    Column {
        id: layerListColumn
        anchors {
            top: parent.top
            left: parent.left
            margins: 8
        }
        spacing: 2

        Label {
            text: "Layers in map"
            visible: layersList.count > 0
            font {
                pixelSize: 14
                bold: true
            }
        }

        // Declare the ListView, which will display the list of files
        ListView {
            id: layersList
            height: contentHeight
            width: 200
            interactive: true
            clip: true
            visible: count > 0
            spacing: 5
            model: sample.layerListModel
            delegate: Component {
                RowLayout {
                    width: parent.width
                    height: 40
                    spacing: 5

                    Label {
                        text: name
                        Layout.leftMargin: 5
                    }

                    Image {
                        Layout.alignment: Qt.AlignRight
                        Layout.preferredHeight: 25
                        Layout.preferredWidth: 25
                        source: "qrc:/Samples/Layers/ManageOperationalLayers/menu.png"

                        MouseArea {
                            anchors.fill: parent
                            onClicked: {
                                layersList.currentIndex = index;
                                menu.open();
                            }
                        }

                        Menu {
                            id: menu
                            width: 125

                            Column {
                                width: parent.width
                                spacing: 10

                                Label {
                                    id: moveUpLabel
                                    text: "  Move down  "
                                    visible: layersList.currentIndex + 1 !== layersList.count

                                    MouseArea {
                                        anchors.fill: parent
                                        onClicked: {
                                            menu.close();
                                            sample.moveLayerDown(index);
                                        }
                                    }
                                }

                                Label {
                                    id: moveDownLabel
                                    text: "  Move up  "
                                    visible: layersList.currentIndex !== 0

                                    MouseArea {
                                        anchors.fill: parent
                                        onClicked: {
                                            menu.close();
                                            sample.moveLayerUp(index);
                                        }
                                    }
                                }

                                Label {
                                    text: "  Remove  "

                                    MouseArea {
                                        anchors.fill: parent
                                        onClicked: {
                                            menu.close();
                                            sample.removeLayer(index);
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }

        Label {
            text: "Deleted layers"
            visible: deletedLayersListView.count > 0
            font {
                pixelSize: 14
                bold: true
            }
        }

        // Declare the ListView, which will display the list of files
        ListView {
            id: deletedLayersListView
            height: contentHeight
            visible: deletedLayersListView.count > 0
            width: 200
            interactive: true
            clip: true
            spacing: 5
            model: sample.deletedLayersList

            delegate: Component {
                RowLayout {
                    width: parent.width
                    height: 40
                    spacing: 5

                    Label {
                        text: modelData
                        Layout.leftMargin: 5
                    }

                    Image {
                        Layout.alignment: Qt.AlignRight
                        Layout.preferredHeight: 25
                        Layout.preferredWidth: 25
                        source: "qrc:/Samples/Layers/ManageOperationalLayers/menu.png"

                        MouseArea {
                            anchors.fill: parent
                            onClicked: {
                                layersList.currentIndex = index;
                                addMenu.open();
                            }
                        }

                        // add menu
                        Menu {
                            id: addMenu
                            width: 125

                            Column {
                                width: parent.width
                                spacing: 10

                                Label {
                                    text: "  Add to map  "

                                    MouseArea {
                                        anchors.fill: parent
                                        onClicked: {
                                            addMenu.close();
                                            sample.addLayer(index);
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}

Your browser is no longer supported. Please upgrade your browser for the best experience. See our browser deprecation post for more details.