16 Interactivity

Contents

• 16.1 Introduction
• 16.2 Complete list of supported events
• 16.3 User interface events
• 16.4 Pointer events
• 16.5 Processing order for user interface events
• 16.6 The 'pointer-events' property
• 16.7 Magnification and panning
• 16.8 Cursors
  • 16.8.1 Introduction to cursors
  • 16.8.2 The 'cursor' property
  • 16.8.3 The 'cursor' element
• 16.9 Document Events Attribute Module
• 16.10 Graphical Events Attribute Module
• 16.11 Animation Events Attribute Module
• 16.12 Cursor Module
• 16.13 DOM interfaces

16.1 Introduction

SVG content can be interactive (i.e., responsive to user-initiated events) by utilizing the following features in the SVG language:

• User-initiated actions such as button presses on the pointing device (e.g., a mouse) can cause animations or scripts to execute.
• The user can initiate hyperlinks to new Web pages (see Links out of SVG content: the 'a' element) by actions such as mouse clicks when the pointing device is positioned over particular graphics elements.
• In many cases, depending on the value of the zoomAndPan attribute on the 'svg' element and on the characteristics of the user agent, users are able to zoom into and pan around SVG content.
• User movements of the pointing device can cause changes to the cursor that shows the current position of the pointing device.

This chapter describes:

• information about events, including under which circumstances events are triggered
• how to indicate whether a given document can be zoomed and panned
• how to specify which cursors to use

Related information can be found in other chapters:

• hyperlinks are discussed in Links
• scripting and event attributes are discussed in Scripting
• SVG's relationship to DOM2 events is discussed in Relationship with DOM2 event model
• animation is discussed in Animation

16.2 Complete list of supported events

The following aspects of SVG are affected by events:

• Using SVG Document Object Model (DOM), a script can register DOM2 event listeners so that script can be invoked when a given event occurs.
• SVG includes event attributes on selected elements which define script that can be executed when a given event occurs in association with the given element.
• SVG's animation elementsCan be defined to begin or end based on events.

The following table lists all of the events which are recognized and supported in SVG. The Event name in the first column is the name to use within SVG's animation elements to define the events which can start or end animations. The DOM2 name in the third column is the name to use when defining DOM2 event listeners. The Event attribute name in the fifth column contains the corresponding name of the event attributes that can be attached to elements in the SVG language.

As in DOM2 Key events, the SVG specification does not provide a key event set. An event set designed for use with keyboard input devices will be included in a later version of the DOM and SVG specifications.

A SVGLoad event is dispatched only to the element to which the event applies; it is not dispatched to its ancestors. For example, if an 'image' element and its parent 'g' element both have event listeners for SVGLoad events, when the 'image' element has been loaded, only its event listener will be invoked. (The 'g' element's event listener will indeed get invoked, but the invocation will happen when the 'g' itself has been loaded.)

Details on the parameters passed to event listeners for the event types from DOM2 can be found in the DOM2 specification. For other event types, the parameters passed to event listeners are described elsewhere in this specification.

16.3 User interface events

On user agents which support interactivity, it is common for authors to define SVG documents such that they are responsive to user interface events. Among the set of possible user events are pointer events, keyboard events, and document events.

In response to user interface (UI) events, the author might start an animation, perform a hyperlink to another Web page, highlight part of the document (e.g., change the color of the graphics elements which are under the pointer), initiate a "roll-over" (e.g., cause some previously hidden graphics elements to appear near the pointer) or launch a script which communicates with a remote database.

For all UI event-related features defined as part of the SVG language via event attributes or animation, the event model corresponds to the event bubbling model described in DOM2 [DOM2-EVBUBBLE]. The event capture model from DOM2 [DOM2-EVCAPTURE] can only be established from DOM method calls.

16.4 Pointer events

User interface events that occur because of user actions performed on a pointer device are called pointer events.

Many systems support pointer devices such as a mouse or trackball. On systems which use a mouse, pointer events consist of actions such as mouse movements and mouse clicks. On systems with a different pointer device, the pointing device often emulates the behavior of the mouse by providing a mechanism for equivalent user actions, such as a button to press which is equivalent to a mouse click.

For each pointer event, the SVG user agent determines the target element of a given pointer event. The target element is the topmost graphics element whose relevant graphical content is under the pointer at the time of the event. (See property 'pointer-events' for a description of how to determine whether an element's relevant graphical content is under the pointer, and thus in which circumstances that graphic element can be the target element for a pointer event.) When an element is not displayed (i.e., when the 'display' property on that element or one of its ancestors has a value of none), that element cannot be the target of pointer events.

The event is either initially dispatched to the target element, to one of the target element's ancestors, or not dispatched, depending on the following:

• If there are no graphics elements whose relevant graphics content is under the pointer (i.e., there is no target element), the event is not dispatched.
• Otherwise, there is a target element. If there is an ancestor of the target element which has specified an event handler with event capturing [DOM2-EVCAPTURE] for the given event, then the event is dispatched to that ancestor element.
• Otherwise, if the target element has an appropriate event handler for the given event, the event is dispatched to the target element.
• Otherwise, each ancestor of the target element (starting with its immediate parent) is checked to see if it has an appropriate event handler. If an ancestor is found with an appropriate event handler, the event is dispatched to that ancestor element.
• Otherwise, the event is discarded.

When event bubbling [DOM2-EVBUBBLE] is active, bubbling occurs up to all direct ancestors of the target element. Descendant elements receive events before their ancestors. Thus, if a 'path' element is a child of a 'g' element and they both have event listeners for click events, then the event will be dispatched to the 'path' element before the 'g' element.

When event capturing [DOM2-EVCAPTURE] is active, ancestor elements receive events before their descendants.

After an event is initially dispatched to a particular element, unless an appropriate action has been taken to prevent further processing (e.g., by invoking the preventCapture() or preventBubble() DOM method call), the event will be passed to the appropriate event handlers (if any) for that element's ancestors (in the case of event bubbling) or that element's descendants (in the case of event capture) for further processing.

16.5 Processing order for user interface events

The processing order for user interface events is as follows:

• Event handlers assigned to the topmost graphics element under the pointer (and the various ancestors of that graphics element via potential event bubbling [DOM2-EVBUBBLE]) receive the event first. If none of the activation event handlers take an explicit action to prevent further processing of the given event (e.g., by invoking the preventDefault() DOM method), then the event is passed on for:
• Processing of any relevant dynamic pseudo-classes (i.e., :hover, :active and :focus) [CSS2-DYNPSEUDO], after which the event is passed on for:
• (For those user interface events which invoke hyperlinks, such as mouse clicks in some user agents) Link processing. If a hyperlink is invoked in response to a user interface event, the hyperlink typically will disable further activation event processing (e.g., often, the link will define a hyperlink to another Web page). If link processing does not disable further processing of the given event, then the event is passed on for:
• (For those user interface events which can select text, such as mouse clicks and drags on 'text' elements) Text selection processing. When a text selection operation occurs, typically it will disable further processing of the given event; otherwise, the event is passed on for:
• Document-wide event processing, such as user agent facilities to allow zooming and panning of an SVG document fragment.

16.6 The 'pointer-events' property

In different circumstances, authors may want to control under what circumstances particular graphic elements can become the target of pointer events. For example, the author might want a given element to receive pointer events only when the pointer is over the stroked perimeter of a given shape. In other cases, the author might want a given element to ignore pointer events under all circumstances so that graphical elements underneath the given element will become the target of pointer events.

For example, suppose a circle with a 'stroke' of red (i.e., the outline is solid red) and a 'fill' of none (i.e., the interior is not painted) is rendered directly on top of a rectangle with a 'fill' of blue. The author might want the circle to be the target of pointer events only when the pointer is over the perimeter of the circle. When the pointer is over the interior of the circle, the author might want the underlying rectangle to be the target element of pointer events.

The 'pointer-events' property specifies under what circumstances a given graphics element can be the target element for a pointer event. It affects the circumstances under which the following are processed:

• user interface events such as mouse clicks
• dynamic pseudo-classes (i.e., :hover, :active and :focus) [CSS2-DYNPSEUDO]
• hyperlinks (see Links out of SVG content: the 'a' element)

visiblePainted

The given element can be the target element for pointer events when the 'visibility' property is set to visible and when the pointer is over a "painted" area. The pointer is over a painted area if it is over the interior (i.e., fill) of the element and the 'fill' property is set to a value other than 'none' or it is over the perimeter (i.e., stroke) of the element and the 'stroke' property is set to a value other than 'none'.

visibleFill

The given element can be the target element for pointer events when the 'visibility' property is set to visible and when the pointer is over the interior (i.e., fill) of the element. The value of the 'fill' property does not effect event processing.

visibleStroke

The given element can be the target element for pointer events when the 'visibility' property is set to visible and when the pointer is over the perimeter (i.e., stroke) of the element. The value of the 'stroke' property does not effect event processing.

visible

The given element can be the target element for pointer events when the 'visibility' property is set to visible and the pointer is over either the interior (i.e., fill) or the perimeter (i.e., stroke) of the element. The values of the 'fill' and 'stroke' do not effect event processing.

painted

The given element can be the target element for pointer events when the pointer is over a "painted" area. The pointer is over a painted area if it is over the interior (i.e., fill) of the element and the 'fill' property is set to a value other than 'none' or it is over the perimeter (i.e., stroke) of the element and the 'stroke' property is set to a value other than 'none'. The value of the 'visibility' property does not effect event processing.

fill

The given element can be the target element for pointer events when the pointer is over the interior (i.e., fill) of the element. The values of the 'fill' and 'visibility' properties do not effect event processing.

stroke

The given element can be the target element for pointer events when the pointer is over the perimeter (i.e., stroke) of the element. The values of the 'stroke' and 'visibility' properties do not effect event processing.

all

The given element can be the target element for pointer events whenever the pointer is over either the interior (i.e., fill) or the perimeter (i.e., stroke) of the element. The values of the 'fill', 'stroke' and 'visibility' properties do not effect event processing.

none

The given element does not receive pointer events.

For text elements, hit detection is performed on a character cell basis:

• The value visiblePainted means that the text string can receive events anywhere within the character cell if either the 'fill' property is set to a value other than none or the 'stroke' property is set to a value other than none, with the additional requirement that the 'visibility' property is set to visible.
• The values visibleFill, visibleStroke and visible are equivalent and indicate that the text string can receive events anywhere within the character cell if the 'visibility' property is set to visible. The values of the 'fill' and 'stroke' properties do not effect event processing.
• The value painted means that the text string can receive events anywhere within the character cell if either the 'fill' property is set to a value other than none or the 'stroke' property is set to a value other than none. The value of the 'visibility' property does not effect event processing.
• The values fill, stroke and all are equivalent and indicate that the text string can receive events anywhere within the character cell. The values of the 'fill', 'stroke' and 'visibility' properties do not effect event processing.
• The value none indicates that the given text does not receive pointer events.

For raster images, hit detection is either performed on a whole-image basis (i.e., the rectangular area for the image is one of the determinants for whether the image receives the event) or on a per-pixel basic (i.e., the alpha values for pixels under the pointer help determine whether the image receives the event):

• The value visiblePainted means that the raster image can receive events anywhere within the bounds of the image if any pixel from the raster image which is under the pointer is not fully transparent, with the additional requirement that the 'visibility' property is set to visible.
• The values visibleFill, visibleStroke and visible are equivalent and indicate that the image can receive events anywhere within the rectangular area for the image if the 'visibility' property is set to visible.
• The value painted means that the raster image can receive events anywhere within the bounds of the image if any pixel from the raster image which is under the pointer is not fully transparent. The value of the 'visibility' property does not effect event processing.
• The values fill, stroke and all are equivalent and indicate that the image can receive events anywhere within the rectangular area for the image. The value of the 'visibility' property does not effect event processing.
• The value none indicates that the image does not receive pointer events.

Note that for raster images, the values of properties 'opacity', 'fill-opacity', 'stroke-opacity', 'fill' and 'stroke' do not effect event processing.

16.7 Magnification and panning

Magnification represents a complete, uniform transformation on an SVG document fragment, where the magnify operation scales all graphical elements by the same amount. A magnify operation has the effect of a supplemental scale and translate transformation placed at the outermost level on the SVG document fragment (i.e., outside the outermost 'svg' element).

Panning represents a translation (i.e., a shift) transformation on an SVG document fragment in response to a user interface action.

SVG user agents that operate in interaction-capable user environments are required to support the ability to magnify and pan.

The outermost 'svg' element in an SVG document fragment has attribute zoomAndPan, which takes the possible values of disable and magnify, with the default being magnify.

If disable, the user agent shall disable any magnification and panning controls and not allow the user to magnify or pan on the given document fragment.

If magnify, in environments that support user interactivity, the user agent shall provide controls to allow the user to perform a "magnify" operation on the document fragment.

If a zoomAndPan attribute is assigned to an inner 'svg' element, the zoomAndPan setting on the inner 'svg' element will have no effect on the SVG user agent.

Animatable: no.

16.8 Cursors

16.8.1 Introduction to cursors

Some interactive display environments provide the ability to modify the appearance of the pointer, which is also known as the cursor. Three types of cursors are available:

• Standard built-in cursors
• Platform-specific custom cursors
• Platform-independent custom cursors

The 'cursor' property is used to specify which cursor to use. The 'cursor' property can be used to clothing standard built-in cursors by specifying a keyword such as crosshair or a custom cursor. Custom cursors are referenced via a <uri> and can point to either an external resource such as a platform-specific cursor file or to a 'cursor' element, which can be used to define a platform-independent cursor.

16.8.2 The 'cursor' property

This property specifies the type of cursor to be displayed for the pointing device. Values have the following meanings:

auto

The UA determines the cursor to display based on the current context.

crosshair

A simple crosshair (e.g., short line segments resembling a "+" sign).

default

The platform-dependent default cursor. Often rendered as an arrow.

pointer

The cursor is a pointer that indicates a link.

move

Indicates something is to be moved.

e-resize, ne-resize, nw-resize, n-resize, se-resize, sw-resize, s-resize, w-resize

Indicate that some edge is to be moved. For example, the 'se-resize' cursor is used when the movement starts from the south-east corner of the box.

text

Indicates text that can be selected. Often rendered as an I-bar.

wait

Indicates that the program is busy. Often rendered as a watch or hourglass.

help

Help is available for the object under the cursor. Often rendered as a question mark or a balloon.

<uri>

The user agent retrieves the cursor from the resource designated by the URI. If the user agent cannot handle the first cursor of a list of cursors, it shall attempt to handle the second, etc. If the user agent cannot handle any user-defined cursor, it must use the generic cursor at the end of the list.

P { cursor : url("mything.cur"), url("second.csr"), text; }

The 'cursor' property for SVG is identical to the 'cursor' property defined in the "Cascading Style Sheets (CSS) level 2" specification [CSS2], with the exception that SVG user agents must support cursors defined by the 'cursor' element.

16.8.3 The 'cursor' element

The 'cursor' element can be used to define a platform-independent custom cursor. A recommended approach for defining a platform-independent custom cursor is to create a PNG [PNG01] image and define a 'cursor' element that references the PNG image and identifies the exact position within the image which is the pointer position (i.e., the hot spot).

The PNG format is recommended because it supports the ability to define a transparency mask via an alpha channel. If a different image format is used, this format should support the definition of a transparency mask (two options: provide an explicit alpha channel or use a particular pixel color to indicate transparency). If the transparency mask can be determined, the mask defines the shape of the cursor; otherwise, the cursor is an opaque rectangle. Typically, the other pixel information (e.g., the R, G and B channels) defines the colors for those parts of the cursor which are not masked out. Note that cursors usually contain at least two colors so that the cursor can be visible over most backgrounds.

<!ENTITY % SVG.cursor.extra.content "" >
<!ENTITY % SVG.cursor.element "INCLUDE" >
<![%SVG.cursor.element;[
<!ENTITY % SVG.cursor.content
 "( %SVG.Description.class; %SVG.cursor.extra.content; )*\
"
>
<!ELEMENT %SVG.cursor.qname; %SVG.cursor.content; >
<!-- end of SVG.cursor.element -->]]>
<!ENTITY % SVG.cursor.attlist "INCLUDE" >
<![%SVG.cursor.attlist;[
<!ATTLIST %SVG.cursor.qname;
 %SVG.Core.attrib;
 %SVG.Conditional.attrib;
 %SVG.XLinkRequired.attrib;
 %SVG.External.attrib;
 x %Coordinate.datatype; #IMPLIED
 y %Coordinate.datatype; #IMPLIED
>

SVG user agents are required to support PNG format images as targets of the xlink:href property.

6.12 Cursor Module

16.13 DOM interfaces

The following interfaces are defined below: SVGCursorElement.

Interface SVGCursorElement

The SVGCursorElement interface corresponds to the 'cursor' element.

IDL Definition

interface SVGCursorElement : SVGElement, SVGURIReference, SVGTests, SVGExternalResourcesRequired { 
 readonly attribute SVGAnimatedLength x;
 readonly attribute SVGAnimatedLength y;
};

Attributes

readonly SVGAnimatedLength x

Corresponds to attribute x on the given 'cursor' element.

readonly SVGAnimatedLength y

Corresponds to attribute y on the given 'cursor' element.

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