mirror of
https://github.com/Jermolene/TiddlyWiki5
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185 lines
5.6 KiB
JavaScript
185 lines
5.6 KiB
JavaScript
/*\
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title: $:/core/modules/widgets/scrollable.js
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type: application/javascript
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module-type: widget
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Scrollable widget
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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var Widget = require("$:/core/modules/widgets/widget.js").widget;
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var ScrollableWidget = function(parseTreeNode,options) {
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this.initialise(parseTreeNode,options);
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this.scaleFactor = 1;
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this.addEventListeners([
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{type: "tm-scroll", handler: "handleScrollEvent"}
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]);
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if($tw.browser) {
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this.requestAnimationFrame = window.requestAnimationFrame ||
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window.webkitRequestAnimationFrame ||
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window.mozRequestAnimationFrame ||
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function(callback) {
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return window.setTimeout(callback, 1000/60);
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};
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this.cancelAnimationFrame = window.cancelAnimationFrame ||
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window.webkitCancelAnimationFrame ||
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window.webkitCancelRequestAnimationFrame ||
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window.mozCancelAnimationFrame ||
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window.mozCancelRequestAnimationFrame ||
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function(id) {
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window.clearTimeout(id);
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};
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}
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};
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/*
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Inherit from the base widget class
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*/
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ScrollableWidget.prototype = new Widget();
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ScrollableWidget.prototype.cancelScroll = function() {
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if(this.idRequestFrame) {
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this.cancelAnimationFrame.call(window,this.idRequestFrame);
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this.idRequestFrame = null;
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}
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};
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/*
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Handle a scroll event
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*/
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ScrollableWidget.prototype.handleScrollEvent = function(event) {
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// Pass the scroll event through if our offsetsize is larger than our scrollsize
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if(this.outerDomNode.scrollWidth <= this.outerDomNode.offsetWidth && this.outerDomNode.scrollHeight <= this.outerDomNode.offsetHeight && this.fallthrough === "yes") {
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return true;
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}
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this.scrollIntoView(event.target);
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return false; // Handled event
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};
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/*
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Scroll an element into view
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*/
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ScrollableWidget.prototype.scrollIntoView = function(element) {
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var duration = $tw.utils.getAnimationDuration();
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this.cancelScroll();
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this.startTime = Date.now();
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var scrollPosition = {
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x: this.outerDomNode.scrollLeft,
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y: this.outerDomNode.scrollTop
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};
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// Get the client bounds of the element and adjust by the scroll position
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var scrollableBounds = this.outerDomNode.getBoundingClientRect(),
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clientTargetBounds = element.getBoundingClientRect(),
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bounds = {
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left: clientTargetBounds.left + scrollPosition.x - scrollableBounds.left,
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top: clientTargetBounds.top + scrollPosition.y - scrollableBounds.top,
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width: clientTargetBounds.width,
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height: clientTargetBounds.height
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};
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// We'll consider the horizontal and vertical scroll directions separately via this function
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var getEndPos = function(targetPos,targetSize,currentPos,currentSize) {
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// If the target is already visible then stay where we are
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if(targetPos >= currentPos && (targetPos + targetSize) <= (currentPos + currentSize)) {
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return currentPos;
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// If the target is above/left of the current view, then scroll to its top/left
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} else if(targetPos <= currentPos) {
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return targetPos;
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// If the target is smaller than the window and the scroll position is too far up, then scroll till the target is at the bottom of the window
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} else if(targetSize < currentSize && currentPos < (targetPos + targetSize - currentSize)) {
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return targetPos + targetSize - currentSize;
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// If the target is big, then just scroll to the top
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} else if(currentPos < targetPos) {
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return targetPos;
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// Otherwise, stay where we are
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} else {
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return currentPos;
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}
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},
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endX = getEndPos(bounds.left,bounds.width,scrollPosition.x,this.outerDomNode.offsetWidth),
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endY = getEndPos(bounds.top,bounds.height,scrollPosition.y,this.outerDomNode.offsetHeight);
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// Only scroll if necessary
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if(endX !== scrollPosition.x || endY !== scrollPosition.y) {
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var self = this,
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drawFrame;
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drawFrame = function () {
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var t;
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if(duration <= 0) {
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t = 1;
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} else {
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t = ((Date.now()) - self.startTime) / duration;
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}
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if(t >= 1) {
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self.cancelScroll();
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t = 1;
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}
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t = $tw.utils.slowInSlowOut(t);
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self.outerDomNode.scrollLeft = scrollPosition.x + (endX - scrollPosition.x) * t;
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self.outerDomNode.scrollTop = scrollPosition.y + (endY - scrollPosition.y) * t;
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if(t < 1) {
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self.idRequestFrame = self.requestAnimationFrame.call(window,drawFrame);
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}
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};
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drawFrame();
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}
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};
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/*
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Render this widget into the DOM
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*/
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ScrollableWidget.prototype.render = function(parent,nextSibling) {
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var self = this;
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// Remember parent
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this.parentDomNode = parent;
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// Compute attributes and execute state
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this.computeAttributes();
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this.execute();
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// Create elements
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this.outerDomNode = this.document.createElement("div");
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$tw.utils.setStyle(this.outerDomNode,[
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{overflowY: "auto"},
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{overflowX: "auto"},
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{webkitOverflowScrolling: "touch"}
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]);
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this.innerDomNode = this.document.createElement("div");
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this.outerDomNode.appendChild(this.innerDomNode);
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// Assign classes
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this.outerDomNode.className = this["class"] || "";
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// Insert element
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parent.insertBefore(this.outerDomNode,nextSibling);
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this.renderChildren(this.innerDomNode,null);
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this.domNodes.push(this.outerDomNode);
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};
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/*
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Compute the internal state of the widget
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*/
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ScrollableWidget.prototype.execute = function() {
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// Get attributes
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this.fallthrough = this.getAttribute("fallthrough","yes");
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this["class"] = this.getAttribute("class");
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// Make child widgets
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this.makeChildWidgets();
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};
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/*
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Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
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*/
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ScrollableWidget.prototype.refresh = function(changedTiddlers) {
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var changedAttributes = this.computeAttributes();
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if(changedAttributes["class"]) {
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this.refreshSelf();
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return true;
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}
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return this.refreshChildren(changedTiddlers);
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};
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exports.scrollable = ScrollableWidget;
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})();
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