X-Git-Url: https://scripts.mit.edu/gitweb/autoinstallsdev/mediawiki.git/blobdiff_plain/19e297c21b10b1b8a3acad5e73fc71dcb35db44a..6932310fd58ebef145fa01eb76edf7150284d8ea:/tests/qunit/suites/resources/mediawiki/mediawiki.viewport.test.js

diff --git a/tests/qunit/suites/resources/mediawiki/mediawiki.viewport.test.js b/tests/qunit/suites/resources/mediawiki/mediawiki.viewport.test.js
new file mode 100644
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+++ b/tests/qunit/suites/resources/mediawiki/mediawiki.viewport.test.js
@@ -0,0 +1,112 @@
+( function ( mw, $ ) {
+
+	// Simulate square element with 20px long edges placed at (20, 20) on the page
+	var
+		DEFAULT_VIEWPORT = {
+			top: 0,
+			left: 0,
+			right: 100,
+			bottom: 100
+		};
+
+	QUnit.module( 'mediawiki.viewport', QUnit.newMwEnvironment( {
+		setup: function () {
+			this.el = $( '<div />' )
+				.appendTo( '#qunit-fixture' )
+				.width( 20 )
+				.height( 20 )
+				.offset( {
+					top: 20,
+					left: 20
+				} )
+				.get( 0 );
+			this.sandbox.stub( mw.viewport, 'makeViewportFromWindow' )
+				.returns( DEFAULT_VIEWPORT );
+		}
+	} ) );
+
+	QUnit.test( 'isElementInViewport', function ( assert ) {
+		var viewport = $.extend( {}, DEFAULT_VIEWPORT );
+		assert.ok( mw.viewport.isElementInViewport( this.el, viewport ),
+			'It should return true when the element is fully enclosed in the viewport' );
+
+		viewport.right = 20;
+		viewport.bottom = 20;
+		assert.ok( mw.viewport.isElementInViewport( this.el, viewport ),
+			'It should return true when only the top-left of the element is within the viewport' );
+
+		viewport.top = 40;
+		viewport.left = 40;
+		viewport.right = 50;
+		viewport.bottom = 50;
+		assert.ok( mw.viewport.isElementInViewport( this.el, viewport ),
+			'It should return true when only the bottom-right is within the viewport' );
+
+		viewport.top = 30;
+		viewport.left = 30;
+		viewport.right = 35;
+		viewport.bottom = 35;
+		assert.ok( mw.viewport.isElementInViewport( this.el, viewport ),
+			'It should return true when the element encapsulates the viewport' );
+
+		viewport.top = 0;
+		viewport.left = 0;
+		viewport.right = 19;
+		viewport.bottom = 19;
+		assert.notOk( mw.viewport.isElementInViewport( this.el, viewport ),
+			'It should return false when the element is not within the viewport' );
+
+		assert.ok( mw.viewport.isElementInViewport( this.el ),
+			'It should default to the window object if no viewport is given' );
+	} );
+
+	QUnit.test( 'isElementInViewport with scrolled page', function ( assert ) {
+		var viewport = {
+				top: 2000,
+				left: 0,
+				right: 1000,
+				bottom: 2500
+			},
+			el = $( '<div />' )
+				.appendTo( '#qunit-fixture' )
+				.width( 20 )
+				.height( 20 )
+				.offset( {
+					top: 2300,
+					left: 20
+				} )
+				.get( 0 );
+		window.scrollTo( viewport.left, viewport.top );
+		assert.ok( mw.viewport.isElementInViewport( el, viewport ),
+			'It should return true when the element is fully enclosed in the ' +
+			'viewport even when the page is scrolled down' );
+		window.scrollTo( 0, 0 );
+	} );
+
+	QUnit.test( 'isElementCloseToViewport', function ( assert ) {
+		var
+			viewport = {
+				top: 90,
+				left: 90,
+				right: 100,
+				bottom: 100
+			},
+			distantElement = $( '<div />' )
+				.appendTo( '#qunit-fixture' )
+				.width( 20 )
+				.height( 20 )
+				.offset( {
+					top: 220,
+					left: 20
+				} )
+				.get( 0 );
+
+		assert.ok( mw.viewport.isElementCloseToViewport( this.el, 60, viewport ),
+			'It should return true when the element is within the given threshold away' );
+		assert.notOk( mw.viewport.isElementCloseToViewport( this.el, 20, viewport ),
+			'It should return false when the element is further than the given threshold away' );
+		assert.notOk( mw.viewport.isElementCloseToViewport( distantElement ),
+			'It should default to a threshold of 50px and the window\'s viewport' );
+	} );
+
+}( mediaWiki, jQuery ) );