This custom tool did the pan of the map for me:
internal class MousePanTool : MapTool
{
[DllImport("user32.dll")]
public static extern short GetAsyncKeyState(UInt16 virtualKeyCode);
public const int VK_LBUTTON = 0x01;
private short _lastMouseButtonState = -1;
private System.Windows.Point _fromMousePoint = new() { X = double.NaN, Y = double.NaN };
private System.Windows.Point _toMousePoint = new() { X = double.NaN, Y = double.NaN };
public MousePanTool()
{
SketchOutputMode = SketchOutputMode.Map;
}
/// <summary>
/// Called when the mouse button is clicked in the view.
/// </summary>
protected override void OnToolMouseDown(MapViewMouseButtonEventArgs e)
{
if (e.ChangedButton == System.Windows.Input.MouseButton.Left)
{
_fromMousePoint = e.ClientPoint;
e.Handled = true;
System.Diagnostics.Trace.WriteLine("!!! OnToolMouseDown");
}
base.OnToolMouseDown(e);
}
/// <summary>
/// Called when the mouse button is released in the view.
/// </summary>
protected override void OnToolMouseUp(MapViewMouseButtonEventArgs e)
{
if (e.ChangedButton == System.Windows.Input.MouseButton.Left)
{
e.Handled = true;
_fromMousePoint = new() { X = double.NaN, Y = double.NaN };
System.Diagnostics.Trace.WriteLine("!!! OnToolMouseUp");
}
base.OnToolMouseUp(e);
}
private bool _isPanning = false;
protected override async void OnToolMouseMove(MapViewMouseEventArgs e)
{
var mapView = MapView.Active;
if (mapView == null || _isPanning)
return;
var mouseButtonState = GetAsyncKeyState(VK_LBUTTON);
if ((mouseButtonState & 0x8000) == 0x0)
{
// the physical left button is not down anymore - stop panning
_fromMousePoint = new() { X = double.NaN, Y = double.NaN };
if (_lastMouseButtonState != mouseButtonState)
{
System.Diagnostics.Trace.WriteLine("!!! MouseUp during mouse move");
_lastMouseButtonState = mouseButtonState;
}
return;
}
_lastMouseButtonState = mouseButtonState;
if (_fromMousePoint.X != double.NaN)
{
_toMousePoint = e.ClientPoint;
_isPanning = true;
try
{
await QueuedTask.Run(() =>
{
var fromPoint = mapView.ClientToMap(_fromMousePoint);
var toPoint = mapView.ClientToMap(_toMousePoint);
var deltaX = toPoint.X - fromPoint.X;
var deltaY = toPoint.Y - fromPoint.Y;
var camera = mapView.Camera;
camera.X -= deltaX;
camera.Y -= deltaY;
mapView.PanTo(camera);
_fromMousePoint = _toMousePoint;
});
}
catch (Exception ex)
{
System.Diagnostics.Trace.WriteLine(ex);
}
finally
{
_isPanning = false;
}
_isPanning = false;
e.Handled = true;
}
}
protected override Task OnToolActivateAsync(bool active)
{
_fromMousePoint = new() { X = double.NaN, Y = double.NaN };
return base.OnToolActivateAsync(active);
}
protected override Task OnToolDeactivateAsync(bool active)
{
_fromMousePoint = new() { X = double.NaN, Y = double.NaN };
return base.OnToolActivateAsync(active);
}
}
This sample only works for 'right-handed' mouse configurations, meaning the left mouse button is the 'physical' left mouse button. To consider a 'left-handed' mouse configuration you can determine the system's current mapping of physical mouse buttons to logical mouse buttons by calling GetSystemMetrics(SM_SWAPBUTTON) which returns TRUE if the mouse buttons were swapped.
Instead of writing your own custom navigation you can also reuse the map navigation functionality that's built into ArcGIS Pro:
var command = FrameworkApplication.GetPlugInWrapper("esri_mapping_exploreTool") as ICommand;
if (command.CanExecute(null))
command.Execute(null);
