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Ignoring enable request', 'warn', 'moodle-core-lockscroll'); return; } if (!this.shouldLockScroll(forceOnSmallWindow)) { Y.log('Dialogue height greater than window height. Ignoring enable request.', 'warn', 'moodle-core-lockscroll'); return; } Y.log('Enabling LockScroll.', 'debug', 'moodle-core-lockscroll'); this._enabled = true; var body = Y.one(Y.config.doc.body); // Get width of body before turning on lockscroll. var widthBefore = body.getComputedStyle('width'); // We use a CSS class on the body to handle the actual locking. body.addClass('lockscroll'); // Increase the count of active instances - this is used to ensure that we do not // remove the locking when parent windows are still open. // Note: We cannot use getData here because data attributes are sandboxed to the instance that created them. var currentCount = parseInt(body.getAttribute('data-activeScrollLocks'), 10) || 0, newCount = currentCount + 1; body.setAttribute('data-activeScrollLocks', newCount); Y.log("Setting the activeScrollLocks count from " + currentCount + " to " + newCount, 'debug', 'moodle-core-lockscroll'); // When initially enabled, set the body max-width to its current width. This // avoids centered elements jumping because the width changes when scrollbars // disappear. if (currentCount === 0) { body.setStyle('maxWidth', widthBefore); } return this; }, /** * Recalculate whether lock scrolling should be on or off. * * @method shouldLockScroll * @param {Boolean} forceOnSmallWindow Whether to enable the scroll lock, even for small window sizes. * @return boolean */ shouldLockScroll: function(forceOnSmallWindow) { var dialogueHeight = this.get('host').get('boundingBox').get('region').height, // Most modern browsers use win.innerHeight, but some older versions of IE use documentElement.clientHeight. // We fall back to 0 if neither can be found which has the effect of disabling scroll locking. windowHeight = Y.config.win.innerHeight || Y.config.doc.documentElement.clientHeight || 0; if (!forceOnSmallWindow && dialogueHeight > (windowHeight - 10)) { return false; } else { return true; } }, /** * Recalculate whether lock scrolling should be on or off because the size of the dialogue changed. * * @method updateScrollLock * @param {Boolean} forceOnSmallWindow Whether to enable the scroll lock, even for small window sizes. * @chainable */ updateScrollLock: function(forceOnSmallWindow) { // Both these functions already check if scroll lock is active and do the right thing. if (this.shouldLockScroll(forceOnSmallWindow)) { this.enableScrollLock(forceOnSmallWindow); } else { this.disableScrollLock(true); } return this; }, /** * Stop locking the page scroll. * * The instance may be disabled but the scroll lock not removed if other instances of the * plugin are also active. * * @method disableScrollLock * @chainable */ disableScrollLock: function(force) { if (this.isActive()) { Y.log('Disabling LockScroll.', 'debug', 'moodle-core-lockscroll'); this._enabled = false; var body = Y.one(Y.config.doc.body); // Decrease the count of active instances. // Note: We cannot use getData here because data attributes are sandboxed to the instance that created them. var currentCount = parseInt(body.getAttribute('data-activeScrollLocks'), 10) || 1, newCount = currentCount - 1; if (force || currentCount === 1) { body.removeClass('lockscroll'); body.setStyle('maxWidth', null); } body.setAttribute('data-activeScrollLocks', currentCount - 1); Y.log("Setting the activeScrollLocks count from " + currentCount + " to " + newCount, 'debug', 'moodle-core-lockscroll'); } return this; }, /** * Return whether scroll locking is active. * * @method isActive * @return Boolean */ isActive: function() { return this._enabled; } }, { NS: 'lockScroll', ATTRS: { } });