TImageEnView.ShiftKeyLock

Declaration

property ShiftKeyLock: TIEShiftLock;

Description

Forces the application of the ssCtrl, ssShift or ssAlt key.

The shift keys have the following effects:

Ctrl Key
◼ When creating a selection, it removes from the existing selection
◼ Change to horizontal scrolling when using mouse wheel if MouseWheelParams.Action = iemwVScroll
◼ When using cursor keys it sizes the selection or layer (instead of moving it)
◼ When editing layer points (mlEditLayerPoints), it removes the point being clicked
◼ When clicking a layer it creates a clone (if loCtrlClickToCopy is specified in LayerOptions)
◼ When using the BrushTool (and OpacityEnabled is enAuto) the brush transparency will be affected by pen pressure

Shift Key
◼ When creating a selection, it adds to the existing selection (EnableShiftKey)
◼ When selecting layers, it adds the selected layer to the multiple selection
◼ When using cursor keys to move or size the selection or layer, it increases the movement by 10x
◼ When rotating using miRotateTool it forces 45 deg. increments (or MouseRotateShiftStep)
◼ When rotating a layer it forces 45 deg. angles (or LayersRotateStep)
◼ When drawing a TIELineLayer, TIEPolylineLayer or TIEAngleLayer it forces lines at 45 deg. angles (or LayersRotateStep)
◼ When rotating the Crop Tool (miCropTool) it forces 15 deg. increments)
◼ When creating a curve using the Alt key and mlEditLayerPoints, the curve will be a perfect half-circle
◼ When filling using miColorFill or miAlphaFill it enables MaxFilter and increases the color tolerance
◼ When using the BrushTool the brush position will be snapped to the axes

Alt Key
◼ When editing layer points (mlEditLayerPoints), it converts the line being dragged into a curve
◼ When creating/sizing a selection it forces a perfect square/circular selection
◼ When creating/sizing a layer it maintains the aspect ratio
◼ When using the BrushTool (and BrushSizeEnabled is enAuto) the brush size will be affected by pen pressure

Use ShiftKeyLock to force any of these behaviours:

Value	Description
iessCtrl_SubFromSel	When creating a selection, it remove from the existing selection
iessCtrl_KeySizing	When using cursor keys it sizes the selection or layer (instead of moving it)
iessCtrl_DelPoint	When editing layer points (mlEditLayerPoints), it removes the point being clicked
iessShift_AddToSel	When creating a selection, it adds to the existing selection
iessShift_AddLyrSel	When selecting layers, it adds the selected layer to the multiple selection
iessShift_FastMove	When using cursor keys to move or size the selection or layer, it increases the movement by 10x
iessShift_RotateLock	When rotating images, layers or crop selections it forces 45 deg. increments
iessShift_LineLock	When drawing a TIELineLayer, TIEPolylineLayer or TIEAngleLayer it forces 45 deg. angles
iessShift_CircularCurve	When creating a curve using the Alt key and mlEditLayerPoints, the curve will be a perfect half-circle
iessShift_MoveSnapping	When drawing with a brush, movement is snapped along axes
iessAlt_Curve	When editing layer points, it converts the line being dragged into a curve
iessAlt_MaintainAR	When creating/sizing a selection or layer it maintains the aspect ratio
iessAlt_InvertWheel	Change to horizontal scrolling when using the mouse wheel in TImageEnView

Default: []

Example

// Force selections to add to existing ones
ImageEnView1.ShiftKeyLock := [ iessShift_AddToSel ];

// Force 45 deg angles for lines, and perfectly square or circular selections
ImageEnView1.ShiftKeyLock := [ iessShift_RotateLock, iessAlt_MaintainAR ];

// Force image sizing to maintain the aspect ratio
ImageEnView1.ShiftKeyLock := [ iessAlt_MaintainAR ];

// Select whole image and allow user to deselect circular regions
With ImageEnView1 do
begin
  SelectionBase := iesbBitmap;
  Select( 0, 0, IEBitmap.Width, IEBitmap.Height );
  ShiftKeyLock := [ iessCtrl_SubFromSel ];
  MouseInteractGeneral := [ miSelectCircle ];
end;

TImageEnView.ShiftKeyLock