Editor Overview

Editor overview

Table of contents

• Moving the viewport
• Zooming
• Selecting items
• Snapping to grid
• Commands

Panning

Panning is done by holding right click and moving the mouse and can be disabled by setting the DisablePanning dependency property to true.

Note: It can be programmatically changed by setting the Offset dependency property.

While panning, the IsPanning dependency property will be set to true and the Viewport and AppliedTransform dependency properties will be updated.

Automatic panning is also enabled by default and can be disabled by setting the DisableAutoPanning dependency property to true. The behavior is to pan the viewport when selecting or dragging a selection or a pending connection near the edges of the viewport.

The auto panning speed can be changed using the AutoPanSpeed dependency property and the distance from the edge to trigger the panning can be changed using the AutoPanEdgeDistance dependency property.

Panning can also be used in combination with selecting and zooming while auto panning can be used with both selecting and zooming and also with dragging a selection or a pending connection.

Default values:

• Offset: [0, 0]
• DisablePanning: false
• DisableAutoPanning: false
• AutoPanSpeed: 10 pixels per tick
• AutoPanEdgeDistance: 15 pixels
• AutoPanningTickRate: 1 millisecond

Zooming

Zooming is done by using the mouse wheel or by pressing CTRL + to zoom in or CTRL - to zoom out and can be disabled by setting the DisableZooming dependency property to true.

Note: It can be programmatically changed by setting the Scale dependency property to a value between MinScale and MaxScale.

While zooming, the Viewport and AppliedTransform dependency properties will be updated.

Zooming can also be used in combination with panning, dragging a selection or a pending connection.

Default values:

• Scale: 1
• MinScale: 0.1
• MaxScale: 2

Selecting

Selecting items is done by holding the left mouse button and moving the mouse. When a selection operation is in progress, the IsSelecting dependency property is set to true and the SelectedArea dependency property is updated with each move.

Note: Selected items can also be set programmatically by binding a collection to the SelectedItems dependency property.

If real-time selection is enabled (EnableRealtimeSelection: true), the items will be selected and deselected while you resize the selection rectangle. Otherwise the items contained in the SelectedArea will only be selected after the selection operation finished.

When an ItemContainer is selected, its IsSelected dependency property is set to true.

Different behavior is used depending on the ModifierKeys held when starting a selection:

• Replace - no modifier key (default behavior, clears the selected items and starts a new selection)
• Append - shift key (adds to the current selected items)
• Remove - alt key (removes selection from the current selected items)
• Invert - control key (removes selected items and adds unselected items)

Selecting items can also be used in combination with panning and zooming.

Default values:

• EnableRealtimeSelection: true

Snapping

When a selection is moved the GridCellSize dependency property will be used to determine where to snap the current selected items. The snapping is relative to the position of the selected item and not the virtual grid.

If the selected items are not snapped to grid when they are initially created or if the GridCellSize is changed at runtime, the final position will be corrected after moving the selection if the EnableSnappingCorrection dependency property is true.

Default values:

• GridCellSize: 1
• EnableSnappingCorrection: true

Commands

The following RoutedUICommands are found in the EditorCommands class:

• ZoomIn - CTRL + (zoom in relative to the viewport's center)
• ZoomOut - CTRL - (zoom out relative to the viewport's center)
• SelectAll - CTRL A (select all items)
• Delete - Delete (delete selected items if ItemsSource is not bound)
• BringIntoView - Moves the viewport to the specified location, defaults to [0,0]. (CommandParameter is location of type Point or string)
• Align - Aligns the selected items using the specified alignment method, defaults to Top. (CommandParameter is of type Alignment or string. Possible alignment: Top, Left, Bottom, Right, Middle, Center)