Class DrawCommandHandler
This CommandHandler class allows the user to position selected Parts in a diagram relative to the first part selected, in addition to overriding the DoKeyDown method of the CommandHandler for handling the arrow keys in additional manners.
Namespace: Northwoods.Go.Extensions
Assembly: DrawCommandHandlerAvalonia.dll
Syntax
public class DrawCommandHandler : CommandHandlerProperties
ArrowKeyBehavior
Gets or sets the arrow key behavior. Possible values can be found in the ArrowBehavior enum.
Declaration
public ArrowBehavior ArrowKeyBehavior { get; set; }Property Value
| Type | Description |
|---|---|
| ArrowBehavior |
Remarks
The default value is Move.
PasteOffset
Gets or sets the offset at which each repeated PasteSelection(Point?) puts the new copied parts from the clipboard.
Declaration
public Point PasteOffset { get; set; }Property Value
| Type | Description |
|---|---|
| Point |
Remarks
The default value is (10, 10).
Methods
AlignBottom()
Aligns selected parts along the bottom-most edge of the bottom-most part.
Declaration
public void AlignBottom()AlignCenterX()
Aligns selected parts at the x-value of the center point of the first selected part.
Declaration
public void AlignCenterX()AlignCenterY()
Aligns selected parts at the y-value of the center point of the first selected part.
Declaration
public void AlignCenterY()AlignColumn(int)
Aligns selected parts top-to-bottom in order of the order selected.
Declaration
public void AlignColumn(int distance = 0)Parameters
| Type | Name | Description |
|---|---|---|
| int | distance |
Remarks
Distance between parts can be specified. Default distance is 0.
AlignLeft()
Aligns selected parts along the left-most edge of the left-most part.
Declaration
public void AlignLeft()AlignRight()
Aligns selected parts along the left-most edge of the left-most part.
Declaration
public void AlignRight()AlignRow(int)
Aligns selected parts left-to-right in order of the order selected.
Declaration
public void AlignRow(int distance = 0)Parameters
| Type | Name | Description |
|---|---|---|
| int | distance |
Remarks
Distance between parts can be specified. Default distance is 0.
AlignTop()
Aligns selected parts along the top-most edge of the top-most part.
Declaration
public void AlignTop()CanAlignSelection()
This controls whether or not the user can invoke the AlignLeft(), AlignRight(), AlignTop(), AlignBottom(), AlignCenterX(), AlignCenterY() commands.
Declaration
public bool CanAlignSelection()Returns
| Type | Description |
|---|---|
| bool | This returns true: if the diagram is not IsReadOnly, if the model is not IsReadOnly, if there are at least two selected Parts. |
CanRotate()
This controls whether or not the user can invoke the Rotate(double) method.
Declaration
public bool CanRotate()Returns
| Type | Description |
|---|---|
| bool | This returns true: if the diagram is not IsReadOnly, if the model is not IsReadOnly, if there is at least one selected Parts. |
CopyToClipboard(IEnumerable<Part>)
Reset the last offset for pasting.
Declaration
public override void CopyToClipboard(IEnumerable<Part> coll)Parameters
| Type | Name | Description |
|---|---|---|
| IEnumerable<Part> | coll |
Overrides
DoKeyDown()
This implements custom behaviors for arrow key keyboard events.
Declaration
public override void DoKeyDown()Overrides
Remarks
Set ArrowKeyBehavior to select, move, scroll, or none This affects the behavior when a user types an arrow key.
PasteFromClipboard()
Paste from the clipboard with an offset incremented on each paste, and reset when copied.
Declaration
public override IReadOnlyCollection<Part> PasteFromClipboard()Returns
| Type | Description |
|---|---|
| IReadOnlyCollection<Part> | a collection of newly pasted Parts |
Overrides
PullToFront()
Change the z-ordering of selected parts to pull them forward, in front of all other parts in their respective layers.
Declaration
public void PullToFront()Remarks
All unselected parts in each layer with a selected Part with a non-numeric ZOrder will get a ZOrder of 0.
PushToBack()
Change the z-ordering of selected parts to push them backward, behind all other parts in their respective layers.
Declaration
public void PushToBack()Remarks
All unselected parts in each layer with a selected Part with a non-numeric ZOrder will get a ZOrder of 0.
Rotate(double)
Change the angle of the parts connected with the given part.
Declaration
public void Rotate(double angle = 90)Parameters
| Type | Name | Description |
|---|---|---|
| double | angle | the positive (clockwise) or negative (counter-clockwise) change in the angle of each Part, in degrees. |
Remarks
This is in the command handler so it can easily be accessed for the purpose of creating commands that change the rotation of parts.