How to Start Resizing Diagram Shape Before Mouse Cursor Enters it
Environment
| Product Version | 2019.2 826 |
| Product | RadDiagram for WPF |
Description
How to start resizing a shape (SizeAll cursor shown) before the mouse enters the RadDiagramShape. This behavior can be observed with the Microsoft PowerPoint shapes.
Solution
To introduce a small tolerance between the shape bounds and the mouse position where you can start the resizing operation, create a custom PointerTool and replace the default one in the ToolService.
public class CustomPointerTool : PointerTool
{
private GroupService groupService;
private RadDiagram graph;
public CustomPointerTool(RadDiagram graph)
{
this.graph = graph;
this.groupService = this.graph.ServiceLocator.GetService<IGroupService>() as GroupService;
}
public override bool MouseMove(PointerArgs e)
{
var baseResult = base.MouseMove(e);
var selectionMode = this.graph.SelectionMode;
if (this.HitItem == null && this.ToolService.IsMouseDown && selectionMode != SelectionMode.None)
{
foreach (var shape in this.graph.Shapes)
{
var inflatedBounds = shape.ActualBounds.InflateRect(30);
if (inflatedBounds.Contains(e.TransformedPoint))
{
if (!shape.IsSelected)
{
bool addToExistingSelection = selectionMode != SelectionMode.Single && (this.ToolService.IsControlDown || selectionMode == SelectionMode.Multiple);
SelectWithGroups(addToExistingSelection, shape);
}
bool isDraggingEnabled = this.SelectionService.SelectedItems.Any(d => d.IsDraggingEnabled == false) ? false : true;
if (isDraggingEnabled)
{
this.ToolService.ActivateTool(DraggingTool.ToolName);
return false;
}
return true;
}
}
}
return baseResult;
}
private void SelectWithGroups(bool addToExistingSelection, IDiagramItem hitItem)
{
var itemsToSelect = this.groupService.GetItemSiblings(hitItem, addToExistingSelection).Union(new[] { hitItem });
this.SelectionService.SelectItems(itemsToSelect, addToExistingSelection);
}
}
public MainWindow()
{
InitializeComponent();
var toolService = this.radDiagram.ServiceLocator.GetService<IToolService>() as ToolService;
toolService.ToolList[0] = new CustomPointerTool(this.diagram);
}