Declaration

TIEMouseInteractLayerItems = (mlMoveLayers, mlResizeLayers, mlRotateLayers, mlCreateImageLayers, mlCreateShapeLayers, mlCreateLineLayers, mlCreatePolylineLayers, mlCreateAngleLayers, mlCreateTextLayers, mlClickCreateLineLayers, mlClickCreatePolylineLayers, mlDrawCreatePolylineLayers, mlClickCreateAngleLayers, mlEditLayerPoints);
TIEMouseInteractLayers = set of TIEMouseInteractLayerItems;

Description

Actions that occur when the user moves or clicks the mouse, which are related to creating and editing layers.

Also see TIEMouseInteract, which are general display and editing interactions.


Note:
1. If you are unable to create layers on the background, ensure that ImageEnView1.Layers[0].Selectable = False.
2. Hold Shift key to lock line angles to LayersRotateStep
3. If loStampMode is specified for LayerOptions, a single click will add the layer
4. Hold Alt key to convert point to a curve. Alt+Shift will give an exact half circle. Use LayersCurvePoints to specify how many points are used for a curve
5. Use mlRotateLayers in layer applications, and miRotateTool in other (single layer) applications

Usage Notes

You can only select one of the following:
mlCreateImageLayers, mlCreateShapeLayers, mlCreateLineLayers, mlCreatePolylineLayers, mlCreateAngleLayers, mlCreateTextLayers,
mlClickCreateLineLayers, mlClickCreatePolylineLayers, mlDrawCreatePolylineLayers, mlClickCreateAngleLayers

The following are often used in combinations with others:
miZoom, miSmoothZoom, miDblClickZoom, miMovingScroll, mlEditLayerPoints,
mlMoveLayers, mlResizeLayers, mlRotateLayers (can be used with any of the miSelect* methods, except miSelectZoom). When miSelect and mlMoveLayer are specified together, then movement is possible only by clicking and dragging the edge of the current layer.
To use mlRotateLayers in combination with layer creation interactions (mlCreate*Layers), loShowRotationGrip must be included for LayerOptions
if mlEditLayerPoints and mlResizeLayers are used in combination, point layers will only be resizable by dragging their points

Common Usages

Layer Creation (create, move and resize layers):
ImageEnView1.MouseInteractLayers := [ mlCreate*Layers, mlMoveLayers, mlResizeLayers ]; // Note: Not mlRotateLayers

Layer Editing (move, resize and rotate layers):
ImageEnView1.MouseInteractLayers := [ mlMoveLayers, mlResizeLayers, mlRotateLayers ];

Polyline Layer Creation (create and edit polyline layers):
ImageEnView1.MouseInteractLayers := [ mlClickCreatePolylineLayers, mlEditLayerPoints ];

Line Layer Creation (create and edit line layers):
ImageEnView1.MouseInteractLayers := [ mlClickCreateLineLayers, mlEditLayerPoints ];

Angle Layer Creation (create and edit angle layers):
ImageEnView1.MouseInteractLayers := [ mlClickCreateAngleLayers, mlEditLayerPoints ];

Line, Angle and Polyline Layer Editing (move, point editing, resizing and rotation):
ImageEnView1.MouseInteractLayers := [ mlMoveLayers, mlEditLayerPoints, mlRotateLayers, mlResizeLayers ];

Selections in a multi-layer app
ImageEnView1.MouseInteractGeneral := [ miSelect, mlMoveLayers ];

Demos

Examples

// Allow users to create image layers. Prompt for an image file after selection
ImageEnView1.LayerOptions := ImageEnView1.LayerOptions + [ loAutoPromptForImage ];
ImageEnView1.MouseInteractLayers := [ mlCreateImageLayers ];

// Allow user to move and resize layers (allow multiple layer selection and ensure masks are moved with layers)
ImageEnView1.LayerOptions := ImageEnView1.LayerOptions + [ loAllowMultiSelect, loAutoSelectMask ];
ImageEnView1.MouseInteractLayers := [ mlMoveLayers, mlResizeLayers ];

A selected text layer with resize grips:


Four selected layers with resize grips:




// Allow user to rotate layers (allow multiple layer selection and ensure masks are moved with layers)
ImageEnView1.LayerOptions := ImageEnView1.LayerOptions + [ loAllowMultiSelect, loAutoSelectMask ];
ImageEnView1.MouseInteractLayers := [ mlRotateLayers ];

// Allow user to make selections when there are multiple layers (current layer will be highlighted. Selecting a new layer will highlight and allow selection. Layer movement is possible by dragging the edge of the layer)
ImageEnView1.MouseInteractGeneral := [ miSelect, mlMoveLayers ];

// Allow user to make selections when there are multiple layers, including resizing and rotating layers. To move layers, you must drag and click the layer edge
ImageEnView1.MouseInteractGeneral := [ miSelect, mlMoveLayers, mlResizeLayers, mlRotateLayers ];

// Allow users to create text layers. Start in text editing mode (user can immediately begin typing text)
ImageEnView1.LayerOptions := ImageEnView1.LayerOptions + [ loAutoTextEditing ];
ImageEnView1.MouseInteractLayers := [ mlCreateTextLayers ];

// Add a star every time the layer clicks on the image (use OnNewLayer event to customize size)
ImageEnView1.LayerOptions := ImageEnView1.LayerOptions + [ loStampMode ];
IEGlobalSettings().DefaultLayerShape := iesStar5;
ImageEnView1.MouseInteractLayers := mlCreateShapeLayers;

// Allow user to draw a polygon
ImageEnView1.LayersAutoClosePolylines := iecmAlways;
ImageEnView1.MouseInteractLayers := [ mlClickCreatePolylineLayers ];

// Allow users to create and edit a polyline
ImageEnView1.LayersAutoClosePolylines := iecmManual;
ImageEnView1.MouseInteractLayers := [ mlClickCreatePolylineLayers, mlEditLayerPoints ];

See Also

◼MouseInteractLayers
◼MouseInteractGeneral
◼SelectionOptions
◼LayerDefaults
◼LayersAutoClosePolylines

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