Map Tool as a Select Tool

Question

Maptool

I created a map-tool which splits a line. If the user has not selected anything and the tool is active, I want the tool to act as a selection tool and after the selection has been made, the tool should revert to a split line tool. This is what I have so far. The await ActivateSelectAsync does not return a value. I tried to set it to a result but I kept getting compile errors.

I thought about adding a timer before calling  StartSketchAsync?

Do you have any ideas on how I might get this to work.

Thanks,

protected override async Task OnToolActivateAsync(bool hasMapViewChanged)
 {
 if (_attributeVM == null)

{

_attributeVM = this.EmbeddableControl as SplitParcelViewModel;

}

if (MapView.Active.Map.SelectionCount == 0)

{
 IsSketchTool = false;
 _attributeVM.Norecords = System.Windows.Visibility.Visible;
 _attributeVM.typeofmessage = ArcGIS.Desktop.Internal.Framework.Controls.MessageType.Error;
 _attributeVM.Changetext = "Nothing selected: Please select a segment to split";
 await ActivateSelectAsync(true);
 //need to wait for user to select something.
 //MessageBox.Show("Please Select a line");

//This happens immediately. I need to ensure that the user has selected something before proceeding. 
 if (UseSelection == true)

{
 IsSketchTool = true;
 //MessageBox.Show("Something selected");
 await StartSketchAsync();

//return Task.FromResult(true);
 }
 else
 {
 MessageBox.Show("Nothing selected");
 //return Task.FromResult(false);
 }
 }
 else
 {
 IsSketchTool = true;
 _attributeVM.Norecords = System.Windows.Visibility.Collapsed;
 //return Task.FromResult(true);
 }
 }

Anonymous User · Answer

Anne, Normally UseSelection = true in the tools constructor is all you need to make this happen. If there's no selection, the framework would hijack your tool and turn it into a rectangle selection tool until something is selected but unfortunately this is bugged. The manual way would be something like: internal class tss : MapTool { public tss() { IsSketchTool = true; SketchType = SketchGeometryType.Line; SketchOutputMode = SketchOutputMode.Map; //UseSelection = true; This doesnt work } protected override Task OnToolActivateAsync(bool active) { SetSketchType(); return base.OnToolActivateAsync(active); } protected override Task<bool> OnSketchCompleteAsync(Geometry geometry) { //if there is no selection then select features with a rectangle //else do something with the sketch if (MapView.Active.Map.SelectionCount == 0) { QueuedTask.Run(() => { //select features with geom MapView.Active.SelectFeatures(geometry); }); } //else //split with geometry return base.OnSketchCompleteAsync(geometry); } protected override Task OnSelectionChangedAsync(MapSelectionChangedEventArgs arg) { //note this is a hidden override method on MapTool SetSketchType(); return base.OnSelectionChangedAsync(arg); } private void SetSketchType() { //set the sketch type based on selection count if (MapView.Active.Map.SelectionCount == 0) SketchType = SketchGeometryType.Rectangle; else SketchType = SketchGeometryType.Line; } }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ Bud_1-1655503769762.png