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添加zoom.js
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@ksky521
ksky521 committed Mar 13, 2015
1 parent a2e7853 commit 9b26203
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Showing 4 changed files with 281 additions and 3 deletions.
2 changes: 1 addition & 1 deletion assets/js/nodeppt.js
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Expand Up @@ -353,7 +353,7 @@
'%, 0%)' : '';
slide.style.animation = slide.style.webkitAnimation = slide.style.msAnimation = slide.style.mozAnimation = isOV ?
'none' : '';
Slide.fire(isOV ? 'overviewshow' : 'overviewhidden');
Slide.fire(isOV ? 'overviewshown' : 'overviewhidden');
}
}

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278 changes: 278 additions & 0 deletions assets/js/zoom.js
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@@ -0,0 +1,278 @@
// Custom reveal.js integration
(function() {
var isEnabled = true;

document.querySelector('slides').addEventListener('mousedown', function(event) {
var modifier = 'altKey';

var zoomPadding = 20;

if (event[modifier] && isEnabled) {
event.preventDefault();

var bounds = event.target.getBoundingClientRect();

zoom.to({
x: bounds.left - zoomPadding,
y: bounds.top - zoomPadding,
width: bounds.width + (zoomPadding * 2),
height: bounds.height + (zoomPadding * 2),
pan: false
});
}
});

Slide.on('overviewshown', function() {
isEnabled = false;
});
Slide.on('overviewhidden', function() {
isEnabled = true;
});
})();

/*!
* zoom.js 0.3 (modified for use with reveal.js)
* http://lab.hakim.se/zoom-js
* MIT licensed
*
* Copyright (C) 2011-2014 Hakim El Hattab, http://hakim.se
*/
var zoom = (function() {

// The current zoom level (scale)
var level = 1;

// The current mouse position, used for panning
var mouseX = 0,
mouseY = 0;

// Timeout before pan is activated
var panEngageTimeout = -1,
panUpdateInterval = -1;

// Check for transform support so that we can fallback otherwise
var supportsTransforms = 'WebkitTransform' in document.body.style || 'MozTransform' in document.body.style || 'msTransform' in document.body.style || 'OTransform' in document.body.style || 'transform' in document.body.style;

if (supportsTransforms) {
// The easing that will be applied when we zoom in/out
document.body.style.transition = 'transform 0.8s ease';
document.body.style.OTransition = '-o-transform 0.8s ease';
document.body.style.msTransition = '-ms-transform 0.8s ease';
document.body.style.MozTransition = '-moz-transform 0.8s ease';
document.body.style.WebkitTransition = '-webkit-transform 0.8s ease';
}

// Zoom out if the user hits escape
document.addEventListener('keyup', function(event) {
if (level !== 1 && event.keyCode === 27) {
zoom.out();
}
});

// Monitor mouse movement for panning
document.addEventListener('mousemove', function(event) {
if (level !== 1) {
mouseX = event.clientX;
mouseY = event.clientY;
}
});

/**
* Applies the CSS required to zoom in, prefers the use of CSS3
* transforms but falls back on zoom for IE.
*
* @param {Object} rect
* @param {Number} scale
*/
function magnify(rect, scale) {

var scrollOffset = getScrollOffset();

// Ensure a width/height is set
rect.width = rect.width || 1;
rect.height = rect.height || 1;

// Center the rect within the zoomed viewport
rect.x -= (window.innerWidth - (rect.width * scale)) / 2;
rect.y -= (window.innerHeight - (rect.height * scale)) / 2;

if (supportsTransforms) {
// Reset
if (scale === 1) {
document.body.style.transform = '';
document.body.style.OTransform = '';
document.body.style.msTransform = '';
document.body.style.MozTransform = '';
document.body.style.WebkitTransform = '';
}
// Scale
else {
var origin = scrollOffset.x + 'px ' + scrollOffset.y + 'px',
transform = 'translate(' + -rect.x + 'px,' + -rect.y + 'px) scale(' + scale + ')';

document.body.style.transformOrigin = origin;
document.body.style.OTransformOrigin = origin;
document.body.style.msTransformOrigin = origin;
document.body.style.MozTransformOrigin = origin;
document.body.style.WebkitTransformOrigin = origin;

document.body.style.transform = transform;
document.body.style.OTransform = transform;
document.body.style.msTransform = transform;
document.body.style.MozTransform = transform;
document.body.style.WebkitTransform = transform;
}
} else {
// Reset
if (scale === 1) {
document.body.style.position = '';
document.body.style.left = '';
document.body.style.top = '';
document.body.style.width = '';
document.body.style.height = '';
document.body.style.zoom = '';
}
// Scale
else {
document.body.style.position = 'relative';
document.body.style.left = (-(scrollOffset.x + rect.x) / scale) + 'px';
document.body.style.top = (-(scrollOffset.y + rect.y) / scale) + 'px';
document.body.style.width = (scale * 100) + '%';
document.body.style.height = (scale * 100) + '%';
document.body.style.zoom = scale;
}
}

level = scale;

if (document.documentElement.classList) {
if (level !== 1) {
document.documentElement.classList.add('zoomed');
} else {
document.documentElement.classList.remove('zoomed');
}
}
}

/**
* Pan the document when the mosue cursor approaches the edges
* of the window.
*/
function pan() {
var range = 0.12,
rangeX = window.innerWidth * range,
rangeY = window.innerHeight * range,
scrollOffset = getScrollOffset();

// Up
if (mouseY < rangeY) {
window.scroll(scrollOffset.x, scrollOffset.y - (1 - (mouseY / rangeY)) * (14 / level));
}
// Down
else if (mouseY > window.innerHeight - rangeY) {
window.scroll(scrollOffset.x, scrollOffset.y + (1 - (window.innerHeight - mouseY) / rangeY) * (14 / level));
}

// Left
if (mouseX < rangeX) {
window.scroll(scrollOffset.x - (1 - (mouseX / rangeX)) * (14 / level), scrollOffset.y);
}
// Right
else if (mouseX > window.innerWidth - rangeX) {
window.scroll(scrollOffset.x + (1 - (window.innerWidth - mouseX) / rangeX) * (14 / level), scrollOffset.y);
}
}

function getScrollOffset() {
return {
x: window.scrollX !== undefined ? window.scrollX : window.pageXOffset,
y: window.scrollY !== undefined ? window.scrollY : window.pageYOffset
}
}

return {
/**
* Zooms in on either a rectangle or HTML element.
*
* @param {Object} options
* - element: HTML element to zoom in on
* OR
* - x/y: coordinates in non-transformed space to zoom in on
* - width/height: the portion of the screen to zoom in on
* - scale: can be used instead of width/height to explicitly set scale
*/
to: function(options) {

// Due to an implementation limitation we can't zoom in
// to another element without zooming out first
if (level !== 1) {
zoom.out();
} else {
options.x = options.x || 0;
options.y = options.y || 0;

// If an element is set, that takes precedence
if (!!options.element) {
// Space around the zoomed in element to leave on screen
var padding = 20;
var bounds = options.element.getBoundingClientRect();

options.x = bounds.left - padding;
options.y = bounds.top - padding;
options.width = bounds.width + (padding * 2);
options.height = bounds.height + (padding * 2);
}

// If width/height values are set, calculate scale from those values
if (options.width !== undefined && options.height !== undefined) {
options.scale = Math.max(Math.min(window.innerWidth / options.width, window.innerHeight / options.height), 1);
}

if (options.scale > 1) {
options.x *= options.scale;
options.y *= options.scale;

magnify(options, options.scale);

if (options.pan !== false) {

// Wait with engaging panning as it may conflict with the
// zoom transition
panEngageTimeout = setTimeout(function() {
panUpdateInterval = setInterval(pan, 1000 / 60);
}, 800);

}
}
}
},

/**
* Resets the document zoom state to its default.
*/
out: function() {
clearTimeout(panEngageTimeout);
clearInterval(panUpdateInterval);

magnify({
x: 0,
y: 0
}, 1);

level = 1;
},

// Alias
magnify: function(options) {
this.to(options)
},
reset: function() {
this.out()
},

zoomLevel: function() {
return level;
}
}

})();
2 changes: 1 addition & 1 deletion package.json
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Expand Up @@ -2,7 +2,7 @@
"name": "nodeppt",
"jsname": "nodeppt",
"description": "A simple, in-browser, markdown-driven presentation framework",
"version": "1.1.0",
"version": "1.1.1",
"site": "https://github.com/ksky521/nodePPT",
"author": {
"name": "Theo Wang",
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2 changes: 1 addition & 1 deletion ppts/demo.md
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Expand Up @@ -2,7 +2,7 @@ title: nodeppt markdown 演示
speaker: Theo Wang
url: https://github.com/ksky521/nodePPT
transition: move
files: /js/demo.js,/css/demo.css
files: /js/demo.js,/css/demo.css,/js/zoom.js

[slide]

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