Identify raster cell

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// [WriteFile Name=IdentifyRasterCell, Category=Layers]
// [Legal]
// Copyright 2020 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 QtQuick.Controls
import Esri.ArcGISRuntime
import Esri.ArcGISExtras
import Esri.ArcGISRuntime.Toolkit

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

    readonly property url dataPath: {
        Qt.platform.os === "ios" ?
                    System.writableLocationUrl(System.StandardPathsDocumentsLocation) + "/ArcGIS/Runtime/Data/raster/SA_EVI_8Day_03May20/" :
                    System.writableLocationUrl(System.StandardPathsHomeLocation) + "/ArcGIS/Runtime/Data/raster/SA_EVI_8Day_03May20/"
    }
    property Point clickedPoint: null
    property string calloutText: ""
    property bool pressedMouse: false

    MapView {
        id: mapView
        anchors.fill: parent

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

        Callout {
            id: callout
            calloutData: parent.calloutData
            implicitWidth: 300
            contentItem: Label {
                id: componentText
                text: calloutText
                wrapMode: Text.WordWrap
                horizontalAlignment: Qt.AlignHCenter
                verticalAlignment: Qt.AlignVCenter
            }
        }

        Map {
            Basemap {
                initStyle: Enums.BasemapStyleArcGISOceans
            }
            RasterLayer {
                id: rasterLayer
                Raster {
                    path: dataPath + "SA_EVI_8Day_03May20.tif"
                }

                onErrorChanged: {
                 console.warn(loadError.message);
                }

                onLoadStatusChanged: {
                    if (loadStatus !== Enums.LoadStatusLoaded)
                        return;

                    mapView.setViewpointGeometry(fullExtent);
                }
            }
        }

        onMouseClicked: mouse => {
            clickedPoint = screenToLocation(mouse.x, mouse.y);
            if (identifyLayerStatus !== Enums.TaskStatusInProgress) {
                identifyLayerWithMaxResults(rasterLayer, mouse.x, mouse.y, 10, false, 1);
            }
        }

        onMousePressedAndHeld: mouse => {
            pressedMouse = true;
            clickedPoint = screenToLocation(mouse.x, mouse.y);
            if (identifyLayerStatus !== Enums.TaskStatusInProgress) {
                identifyLayerWithMaxResults(rasterLayer, mouse.x, mouse.y, 10, false, 1);
            }
        }
        onMouseReleased: pressedMouse = false;
        onMousePositionChanged: mouse => {
            if (pressedMouse) {
                clickedPoint = screenToLocation(mouse.x, mouse.y);
                if (identifyLayerStatus !== Enums.TaskStatusInProgress) {
                    identifyLayerWithMaxResults(rasterLayer, mouse.x, mouse.y, 10, false, 1);
                }
            }
        }

        onIdentifyLayerStatusChanged: {
            if (identifyLayerStatus !== Enums.TaskStatusCompleted)
                return;

            for (let i = 0; i < identifyLayerResult.geoElements.length; i++) {
                calloutText = "";
                let geoElement = identifyLayerResult.geoElements[i];
                const attributes = geoElement.attributes;
                const attributeNames = attributes.attributeNames;

                for (let j = 0; j < attributeNames.length; j++) {
                    calloutText = calloutText + attributeNames[j] + ": " + attributes.attributeValue(attributeNames[j]) + "\n";
                }

                const xPoint = geoElement.geometry.extent.xMin;
                const yPoint = geoElement.geometry.extent.yMin;

                calloutText = calloutText + "X: " + xPoint.toFixed(2) + " Y: " + yPoint.toFixed(2);

                callout.calloutData.location = clickedPoint;
                callout.showCallout();
            }
        }
    }
}