Class GuidedDraggingTool
The GuidedDraggingTool class makes guidelines visible as the parts are dragged around a diagram when the selected part is nearly aligned with another part.
Namespace: Northwoods.Go.Tools.Extensions
Assembly: GuidedDraggingAvalonia.dll
Syntax
public class GuidedDraggingTool : DraggingToolConstructors
GuidedDraggingTool()
Constructs a GuidedDraggingTool and sets up the temporary guideline parts.
Declaration
public GuidedDraggingTool()Properties
CenterGuidelineColor
Gets or sets the color of center guidelines.
Declaration
public string CenterGuidelineColor { get; set; }Property Value
| Type | Description |
|---|---|
| string |
Remarks
The default value is "gray".
GuidelineSnapDistance
Gets or sets the margin of error for which guidelines show up.
Declaration
public double GuidelineSnapDistance { get; set; }Property Value
| Type | Description |
|---|---|
| double |
Remarks
The default value is 6. Guidelines will show up when the aligned nodes are ± 6px away from perfect alignment.
GuidelineWidth
Gets or sets the StrokeWidth of the guidelines.
Declaration
public double GuidelineWidth { get; set; }Property Value
| Type | Description |
|---|---|
| double |
Remarks
The default value is 1.
HorizontalGuidelineColor
Gets or sets the color of horizontal guidelines.
Declaration
public string HorizontalGuidelineColor { get; set; }Property Value
| Type | Description |
|---|---|
| string |
Remarks
The default value is "gray".
IsGuidelineEnabled
Gets or sets whether the guidelines are enabled or disabled.
Declaration
public bool IsGuidelineEnabled { get; set; }Property Value
| Type | Description |
|---|---|
| bool |
Remarks
The default value is true.
IsGuidelineSnapEnabled
Gets or sets whether snapping to guidelines is enabled.
Declaration
public bool IsGuidelineSnapEnabled { get; set; }Property Value
| Type | Description |
|---|---|
| bool |
Remarks
The default value is true.
SearchDistance
Gets or sets the distance around the selected part to search for aligned parts.
Declaration
public double SearchDistance { get; set; }Property Value
| Type | Description |
|---|---|
| double |
Remarks
The default value is 1000. Set this to double.PositiveInfinity if you want to search the entire diagram no matter how far away.
VerticalGuidelineColor
Gets or sets the color of vertical guidelines.
Declaration
public string VerticalGuidelineColor { get; set; }Property Value
| Type | Description |
|---|---|
| string |
Remarks
The default value is "gray".
Methods
ClearGuidelines()
Removes all of the guidelines from the grid.
Declaration
public void ClearGuidelines()DoDeactivate()
Calls the base method and removes the guidelines from the graph.
Declaration
public override void DoDeactivate()Overrides
DoDragOver(Point, GraphObject)
Shows vertical and horizontal guidelines for the dragged part.
Declaration
public override void DoDragOver(Point pt, GraphObject obj)Parameters
| Type | Name | Description |
|---|---|---|
| Point | pt | |
| GraphObject | obj |
Overrides
DoDropOnto(Point, GraphObject)
On a mouse-up, snaps the selected part to the nearest guideline. If not snapping, the part remains at its position.
Declaration
public override void DoDropOnto(Point pt, GraphObject obj)Parameters
| Type | Name | Description |
|---|---|---|
| Point | pt | |
| GraphObject | obj |
Overrides
InvalidateLinks(Part)
When nodes are shifted due to being guided upon a drop, make sure all connected link routes are invalidated, since the node is likely to have moved a different amount than all its connected links in the regular operation of the DraggingTool.
Declaration
public static void InvalidateLinks(Part node)Parameters
| Type | Name | Description |
|---|---|---|
| Part | node |
IsGuiding(Part, Part)
This predicate decides whether or not the given Part should guide the draggred part.
Declaration
protected virtual bool IsGuiding(Part part, Part guidedpart)Parameters
| Type | Name | Description |
|---|---|---|
| Part | part | a stationary Part to which the dragged part might be aligned |
| Part | guidedpart | the Part being dragged |
Returns
| Type | Description |
|---|---|
| bool |
ShowHorizontalMatches(Part, bool, bool)
This finds parts that are aligned near the selected part along horizontal lines. It compares the selected part to all parts within a rectangle approximately twice the SearchDistance wide. The guidelines appear when a part is aligned within a margin-of-error equal to GuidelineSnapDistance.
Declaration
public void ShowHorizontalMatches(Part part, bool guideline, bool snap)Parameters
| Type | Name | Description |
|---|---|---|
| Part | part | |
| bool | guideline | if true, show guideline |
| bool | snap | if true, snap the part to where the guideline would be |
ShowVerticalMatches(Part, bool, bool)
This finds parts that are aligned near the selected part along vertical lines. It compares the selected part to all parts within a rectangle approximately twice the SearchDistance tall. The guidelines appear when a part is aligned within a margin-of-error equal to GuidelineSnapDistance.
Declaration
public void ShowVerticalMatches(Part part, bool guideline, bool snap)Parameters
| Type | Name | Description |
|---|---|---|
| Part | part | |
| bool | guideline | if true, show guideline |
| bool | snap | if true, don't show guidelines but just snap the part to where the guideline would be |