mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-07-05 19:53:17 +00:00
392e717497
Now the title is passed around, rather than a reference to the tiddler. This lets the context be a missing tiddler, enabling us to correctly render missing tiddlers
107 lines
3.8 KiB
JavaScript
107 lines
3.8 KiB
JavaScript
/*\
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title: js/macros/zoomer.js
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\*/
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(function(){
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/*jslint node: true, browser: true */
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"use strict";
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var Renderer = require("../Renderer.js").Renderer,
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Dependencies = require("../Dependencies.js").Dependencies,
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Tiddler = require("../Tiddler.js").Tiddler,
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utils = require("../Utils.js");
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function startZoomer(macroNode,x,y) {
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macroNode.inZoomer = true;
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macroNode.startX = x;
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macroNode.startY = y;
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utils.addClass(document.body,"in-zoomer");
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}
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function stopZoomer(macroNode) {
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var newScrollY = macroNode.yFactor * (macroNode.bodyHeight - macroNode.windowHeight);
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macroNode.inZoomer = false;
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window.scrollTo(0,newScrollY);
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document.body.style.webkitTransform = "translateY(" + newScrollY * macroNode.xFactor + "px) " +
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"scale(" + macroNode.scale + ") " +
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"translateY(" + ((macroNode.windowHeight / macroNode.scale) - macroNode.bodyHeight) * macroNode.yFactor * macroNode.xFactor + "px)";
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utils.removeClass(document.body,"in-zoomer");
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document.body.style.webkitTransform = "translateY(0) scale(1) translateY(0)";
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}
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/*
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Zoom the body element given a touch/mouse position in screen coordinates
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*/
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function hoverZoomer(macroNode,x,y) {
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// Put the transform origin at the top in the middle
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document.body.style.webkitTransformOrigin = "50% 0";
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// Some shortcuts
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macroNode.bodyWidth = document.body.offsetWidth;
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macroNode.bodyHeight = document.body.offsetHeight;
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macroNode.windowWidth = window.innerWidth;
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macroNode.windowHeight = window.innerHeight;
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// Compute the scale factor for fitting the entire page into the window. This is
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// the scale factor we'll use when the touch is far to the left
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macroNode.minScale = macroNode.windowHeight / macroNode.bodyHeight;
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if(macroNode.minScale < 0.1) {
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// Don't scale to less than 10% of original size
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macroNode.minScale = 0.1;
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} else if(macroNode.minScale > 1) {
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// Nor should we scale up if the body is shorter than the window
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macroNode.minScale = 1;
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}
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// We divide the screen into two horizontal zones divided by the right edge of the body at maximum zoom (ie minimum scale)
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macroNode.splitPos = macroNode.windowWidth/2 + (macroNode.bodyWidth * macroNode.minScale)/2;
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// Compute the 0->1 ratio (from right to left) of the position of the touch within the right zone
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macroNode.xFactor = (macroNode.windowWidth - x) / (macroNode.windowWidth - macroNode.splitPos);
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if(macroNode.xFactor > 1) {
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macroNode.xFactor = 1;
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}
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// And the 0->1 ratio (from top to bottom) of the position of the touch down the screen
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macroNode.yFactor = y/macroNode.windowHeight;
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// Now interpolate the scale
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macroNode.scale = (macroNode.minScale - 1) * macroNode.xFactor + 1;
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// Apply the transform. The malarkey with .toFixed() is because otherwise we might get numbers in
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// exponential notation (such as 5.1e-15) that are illegal in CSS
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var preTranslateY = window.scrollY * macroNode.xFactor,
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scale = macroNode.scale,
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postTranslateY = ((macroNode.windowHeight / macroNode.scale) - macroNode.bodyHeight) * macroNode.yFactor * macroNode.xFactor;
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var transform = "translateY(" + preTranslateY.toFixed(8) + "px) " +
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"scale(" + scale.toFixed(8) + ") " +
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"translateY(" + postTranslateY.toFixed(8) + "px)";
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document.body.style.webkitTransform = transform;
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}
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exports.macro = {
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name: "zoomer",
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wrapperTag: "div",
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params: {
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},
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events: {
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touchstart: function(event) {
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startZoomer(this,event.touches[0].clientX,event.touches[0].clientY);
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hoverZoomer(this,event.touches[0].clientX,event.touches[0].clientY);
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event.preventDefault();
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return false;
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},
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touchmove: function(event) {
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hoverZoomer(this,event.touches[0].clientX,event.touches[0].clientY);
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event.preventDefault();
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return false;
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},
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touchend: function(event) {
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stopZoomer(this);
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event.preventDefault();
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return false;
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}
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},
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execute: function() {
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this.inZoomer = false;
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return [];
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}
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};
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})();
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