Class s7sdk.common.ZoomOutButton

Extends s7sdk.common.Button.

You can associate the ZoomOutButton with a ZoomView component to zoom out the view. This component uses a minus sign as the default icon.

This component does not currently read any modifiers.

Defining the Appearance using CSS

The CSS class for styling the ZoomOutButton is .s7zoomoutbutton. This button has four states: up, over, down and disabled. You can style these states by adding the state attribute selector to the CSS class. It is recommended that you define common CSS under the main class and only define the necessary distinctions when using attribute selectors.

CSS Class	Attribute Selector	Description
`.s7zoomoutbutton`	`state=[up\|over\|down\|disabled]`	Define the appearance of `ZoomOutButton` for each state.
`.s7tooltip`	(None)	A global class selector that defines appearance for the tooltips. To disable tooltips set the `display` style to `none`.

Localized Symbols

ZoomOutButton also has text symbols that you can localize either in a preset or in the viewer page though the mechanisms provided by the ParameterManager. For more information on localization consult the ParameterManager API documentation and HTML5 Viewers SDK User Guide.

Symbol	Description
`ZoomOutButton.TOOLTIP`	Define a localized tooltip of `ZoomOutButton`

Class Summary
Constructor Attributes	Constructor Name and Description
	s7sdk.common.ZoomOutButton(container, settings, compId)

Methods borrowed from class s7sdk.common.Button:: activate, addEventListener, blur, deactivate, dispose, focus, getHeight, getWidth, resize, setCSS, setLabel

Class Detail

s7sdk.common.ZoomOutButton(container, settings, compId)

Example Code
This example demonstrates how to use the ZoomOutButton component in a simple viewer. In this example a Container object,
a ZoomView object, a ZoomInButton object, and a ZoomOutButton object, and a ZoomResetButton object are created. When
a user interacts with the ZoomView object, causing it to zoom in or out on the image, the zoom buttons become enabled
or disabled as appropriate for the current zoom level of the image. When a user clicks any of the zoom buttons,
the ZoomView object zooms the image in or out as appropriate.

The code below does the following:

The Scene7 HTML5 SDK is linked to the page and the required s7sdk components are included in the document head.
CSS Styles are defined in the document head to control the appearance of the ZoomView and button components.
The s7sdk.Util.init() method is called to initialize the SDK.
A ParameterManager object is created to handle component modifiers for the viewer.
An initViewer() function is defined. This function initializes a couple of modifiers (hard coded for example purposes),
then creates the component objects required for this simple example. The initViewer() function also adds event listeners
that designate functions to handle relevant component events (which might be dispatched by the components as a result of
user interactions, changes in a component's state, etc.).
Handler functions are defined to respond to the component event listeners added in the initViewer() function.
An event listener is added to the ParameterManager object that designates the initViewer() function as the handler
to call when the Scene7 SDK is loaded and ready.
Finally, the init() method is called on the ParameterManager object to start the viewer.

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <meta name="viewport" content="width=device-width" />

        <title>ZoomView Component</title>

        <!-- To run this example locally you need to replace this with an absolute
        SDK path.  For more information check the HTML5 Viewers SDK User Guide or
        the examples included in the package.
        -->
        <script language="javascript" type="text/javascript"
                src="../js/s7sdk/utils/Utils.js"></script>
        <script language="javascript" type="text/javascript">
            s7sdk.Util.lib.include('s7sdk.image.ZoomView');
            s7sdk.Util.lib.include('s7sdk.common.Container');
            s7sdk.Util.lib.include('s7sdk.common.Button');
        </script>

        <style type="text/css" media="screen">
            html,body {
                width: 100%;
                height: 100%;
            }
            body {
                margin: 0px;
                padding: 0px;
            }	
            .s7zoomview {
                top: 0px;
                left: 0px;
                height: 400px;
                width: 280px;
            }
            .s7zoominbutton{
                position: absolute;
                top: 375px;
                left: 10px;
                width: 25px;
                height: 25px;
                z-index: 5000;
            }
            .s7zoomoutbutton {
                position: absolute;
                top: 375px;
                left: 250px;
                width: 25px;
                height: 25px;
                z-index: 5000;
            }
            .s7zoomresetbutton {
                position: absolute;
                top: 375px;
                left: 127px;
                width: 25px;
                height: 25px;
                z-index: 5000;
            }
        </style>
    </head>
    <body>
        <div id="s7container"></div>

        <script language="JavaScript" type="text/javascript">
            var params, container, zoomView, zoomInButton, zoomOutButton, zoomResetButton;

            // Initialize the SDK
            s7sdk.Util.init();

            // Create ParameterManager instance to handles modifiers		
            params = new s7sdk.ParameterManager();
                
            // Define the function that initializes the viewer
            function initViewer(){
                // Set hardcoded modifiers (not required when values are specified on the url)
                params.push("serverurl", "http://s7d1.scene7.com/is/image");
                params.push("asset", "demo/bedroom.tif");

                // Create the Container component object
                container = new s7sdk.Container(null, params, "s7container");

                // Create the ZoomView component object
                zoomView = new s7sdk.image.ZoomView( container, params, "zoomView");
                
                // Create the ZoomInButton component object
                zoomInButton = new s7sdk.common.ZoomInButton(container, params, "zoomInButton");

                // Create the ZoomOutButton component object
                zoomOutButton = new s7sdk.common.ZoomOutButton(container, params, "zoomOutButton");

                // Create the ZoomResetButton component object
                zoomResetButton = new s7sdk.common.ZoomResetButton(container, params, "zoomResetButton");

                // Add an event listener for zoom capability state changes
                zoomView.addEventListener(s7sdk.event.CapabilityStateEvent.NOTF_ZOOM_CAPABILITY_STATE, onZoomStateChange);

                // Add event listeners for all zoom button click events
                zoomInButton.addEventListener("click", onZoomIn);
                zoomOutButton.addEventListener("click", onZoomOut);
                zoomResetButton.addEventListener("click", onZoomReset);
            }

            // Define an event handler function to enable/disable the zoom buttons when the ZoomView state changes
            function onZoomStateChange(event){
                if(event.s7event.state.hasCapability(s7sdk.ZoomCapabilityState.ZOOM_IN)){
                    zoomInButton.activate();
                }else{
                    zoomInButton.deactivate();
                }
                if(event.s7event.state.hasCapability(s7sdk.ZoomCapabilityState.ZOOM_OUT)){
                    zoomOutButton.activate();
                }else{
                    zoomOutButton.deactivate();
                }
                if(event.s7event.state.hasCapability(s7sdk.ZoomCapabilityState.ZOOM_RESET)){
                    zoomResetButton.activate();
                }else{
                    zoomResetButton.deactivate();
                }
            }

            // Define an event handler function to update the ZoomView when zoomIn is clicked
            function onZoomIn(event){
                zoomView.zoomIn();
            }

            // Define an event handler function to update the ZoomView when zoomOut is clicked
            function onZoomOut(event){
                zoomView.zoomOut();
            }

            // Define an event handler function to reset the ZoomView zoom level
            function onZoomReset(event) {
                zoomView.zoomReset();
            }

            // The ParameterManager will dispatch SDK_READY when all modifiers have been processed
            // and it is safe to initialize the viewer		
            params.addEventListener(s7sdk.Event.SDK_READY, initViewer, false);

            // Now it is safe to process the modifiers, the callbacks have been defined
            // this will trigger the SDK_READY event
            params.init();
        </script>

    </body>
</html>

Default styles for ZoomOutButton:

.s7zoomoutbutton {
	width:25px;
	height:25px;
	background-size:contain;
	background-repeat:no-repeat;
	background-position:center;
	-webkit-touch-callout:none;
	-webkit-user-select:none;
	-moz-user-select:none;
	-ms-user-select:none;
	user-select:none;
	-webkit-tap-highlight-color:rgba(0,0,0,0);
 }
.s7zoomoutbutton[state='up'] {
	background-image:url(images/sdk/zoomout_up.png);
 }
.s7zoomoutbutton[state='over'] {
	background-image:url(images/sdk/zoomout_over.png);
 }
.s7zoomoutbutton[state='down'] {
	background-image:url(images/sdk/zoomout_down.png);
 }
.s7zoomoutbutton[state='disabled'] {
	background-image:url(images/sdk/zoomout_disabled.png);
 }
.s7tooltip {
	position:absolute;
	padding:5px;
	line-height:100%;
	text-align:center;
	background-color:rgb(224, 224, 224);
	color:rgb(26,26,26);
	font-family:Helvetica, sans-serif;
	font-size:11px;
	z-index:10000;
	border:1px solid rgb(191,191,191);
 }

Parameters:
{String|Container} container: The reference to Container instance, ControlBar instance or the ID of the parent DOM element to which the component is added as a child
{s7sdk.ParameterManager} settings: ParameterManager as settings.
{String} compId: A unique ID for this component.

Namespaces

Classes in s7sdk.common

Class s7sdk.common.ZoomOutButton