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Use hidden iframe to detect resize + obey max width when getting maximum size. Updated the bar sample to start off hidden. Use the 'show' button to display the graph

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This commit is contained in:
Evert Timberg 2015-09-20 10:30:12 -04:00
parent 7d0a7844ea
commit 39252d4633
4 changed files with 150 additions and 49 deletions
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21
samples/bar.html
View File

@ -5,10 +5,15 @@
<title>Bar Chart</title>
<script src="../node_modules/jquery/dist/jquery.min.js"></script>
<script src="../Chart.js"></script>
<style type="text/css">
canvas {
border: 1px solid red;
}
</style>
</head>
<body>
<div style="width: 50%">
<div id="container" style="width: 50%; height: 25%; display:none;">
<canvas id="canvas" height="450" width="600"></canvas>
</div>
<button id="randomizeData">Randomize Data</button>
@ -16,6 +21,7 @@
<button id="removeDataset">Remove Dataset</button>
<button id="addData">Add Data</button>
<button id="removeData">Remove Data</button>
<button id="show">Show</button>
<div>
<h3>Legend</h3>
<div id="legendContainer">
@ -64,6 +70,13 @@
data: barChartData,
options: {
responsive: true,
scales: {
xAxes: [{
// So that bars fill the entire width of the grid
categorySpacing: 0,
spacing: 0
}]
}
}
});
@ -100,7 +113,7 @@
$('#addData').click(function() {
if (barChartData.datasets.length > 0) {
barChartData.labels.push('dataset #' + barChartData.labels.length);
barChartData.labels.push('data #' + barChartData.labels.length);
for (var index = 0; index < barChartData.datasets.length; ++index) {
window.myBar.addData(randomScalingFactor(), index);
@ -123,6 +136,10 @@
});
updateLegend();
});
$('#show').click(function() {
document.getElementById('container').style.display = '';
});
</script>
</body>

23
src/core/core.controller.js
View File

@ -123,9 +123,11 @@
resize: function resize(silent) {
this.stop();
var canvas = this.chart.canvas,
newWidth = helpers.getMaximumWidth(this.chart.canvas),
newHeight = this.options.maintainAspectRatio ? newWidth / this.chart.aspectRatio : helpers.getMaximumHeight(this.chart.canvas);
var canvas = this.chart.canvas;
var newWidth = helpers.getMaximumWidth(this.chart.canvas);
var newHeight = (this.options.maintainAspectRatio && isNaN(this.chart.aspectRatio) === false && isFinite(this.chart.aspectRatio) && this.chart.aspectRatio !== 0)
? newWidth / this.chart.aspectRatio
: helpers.getMaximumHeight(this.chart.canvas);
canvas.width = this.chart.width = newWidth;
canvas.height = this.chart.height = newHeight;
@ -348,19 +350,16 @@
destroy: function destroy() {
this.clear();
helpers.unbindEvents(this, this.events);
var canvas = this.chart.canvas;
helpers.removeResizeListener(this.chart.canvas.parentNode);
// Reset canvas height/width attributes starts a fresh with the canvas context
// Reset canvas height/width attributes
var canvas = this.chart.canvas;
canvas.width = this.chart.width;
canvas.height = this.chart.height;
// < IE9 doesn't support removeProperty
if (canvas.style.removeProperty) {
canvas.style.removeProperty('width');
canvas.style.removeProperty('height');
} else {
canvas.style.removeAttribute('width');
canvas.style.removeAttribute('height');
// if we scaled the canvas in response to a devicePixelRatio !== 1, we need to undo that transform here
if (this.chart.originalDevicePixelRatio !== undefined) {
canvas.scale(1 / this.chart.originalDevicePixelRatio, 1 / this.chart.originalDevicePixelRatio);
}
delete Chart.instances[this.id];

110
src/core/core.helpers.js
View File

@ -690,17 +690,54 @@
removeEvent(chartInstance.chart.canvas, eventName, handler);
});
},
getConstraintWidth = helpers.getConstraintWidth = function(domNode) { // returns Number or undefined if no constraint
var constrainedWidth;
var constrainedWNode = document.defaultView.getComputedStyle(domNode)['max-width'];
var constrainedWContainer = document.defaultView.getComputedStyle(domNode.parentNode)['max-width'];
var hasCWNode = constrainedWNode !== null && constrainedWNode !== "none";
var hasCWContainer = constrainedWContainer !== null && constrainedWContainer !== "none";
if (hasCWNode || hasCWContainer) {
constrainedWidth = Math.min((hasCWNode ? parseInt(constrainedWNode, 10) : Number.POSITIVE_INFINITY), (hasCWContainer ? parseInt(constrainedWContainer, 10) : Number.POSITIVE_INFINITY));
}
return constrainedWidth;
},
getConstraintHeight = helpers.getConstraintHeight = function(domNode) { // returns Number or undefined if no constraint
var constrainedHeight;
var constrainedHNode = document.defaultView.getComputedStyle(domNode)['max-height'];
var constrainedHContainer = document.defaultView.getComputedStyle(domNode.parentNode)['max-height'];
var hasCHNode = constrainedHNode !== null && constrainedHNode !== "none";
var hasCHContainer = constrainedHContainer !== null && constrainedHContainer !== "none";
if (constrainedHNode || constrainedHContainer) {
constrainedHeight = Math.min((hasCHNode ? parseInt(constrainedHNode, 10) : Number.POSITIVE_INFINITY), (hasCHContainer ? parseInt(constrainedHContainer, 10) : Number.POSITIVE_INFINITY));
}
return constrainedHeight;
},
getMaximumWidth = helpers.getMaximumWidth = function(domNode) {
var container = domNode.parentNode,
padding = parseInt(getStyle(container, 'padding-left')) + parseInt(getStyle(container, 'padding-right'));
// TODO = check cross browser stuff with this.
return container.clientWidth - padding;
var container = domNode.parentNode;
var padding = parseInt(getStyle(container, 'padding-left')) + parseInt(getStyle(container, 'padding-right'));
var w = container.clientWidth - padding;
var cw = getConstraintWidth(domNode);
if (cw !== undefined) {
w = Math.min(w, cw);
}
return w;
},
getMaximumHeight = helpers.getMaximumHeight = function(domNode) {
var container = domNode.parentNode,
padding = parseInt(getStyle(container, 'padding-bottom')) + parseInt(getStyle(container, 'padding-top'));
// TODO = check cross browser stuff with this.
return container.clientHeight - padding;
var container = domNode.parentNode;
var padding = parseInt(getStyle(container, 'padding-top')) + parseInt(getStyle(container, 'padding-bottom'));
var h = container.clientHeight - padding;
var ch = getConstraintHeight(domNode);
if (ch !== undefined) {
h = Math.min(h, ch);
}
return h;
},
getStyle = helpers.getStyle = function(el, property) {
return el.currentStyle ?
@ -709,16 +746,19 @@
},
getMaximumSize = helpers.getMaximumSize = helpers.getMaximumWidth, // legacy support
retinaScale = helpers.retinaScale = function(chart) {
var ctx = chart.ctx,
width = chart.canvas.width,
height = chart.canvas.height;
var ctx = chart.ctx;
var width = chart.canvas.width;
var height = chart.canvas.height;
if (window.devicePixelRatio) {
ctx.canvas.style.width = width + "px";
ctx.canvas.style.height = height + "px";
if (window.devicePixelRatio !== 1) {
ctx.canvas.height = height * window.devicePixelRatio;
ctx.canvas.width = width * window.devicePixelRatio;
ctx.scale(window.devicePixelRatio, window.devicePixelRatio);
// Store the device pixel ratio so that we can go backwards in `destroy`.
// The devicePixelRatio changes with zoom, so there are no guarantees that it is the same
// when destroy is called
chart.originalDevicePixelRatio = chart.originalDevicePixelRatio || window.devicePixelRatio;
}
},
//-- Canvas methods
@ -757,6 +797,48 @@
}
return window.Color(color);
},
addResizeListener = helpers.addResizeListener = function(node, callback) {
// Hide an iframe before the node
var hiddenIframe = document.createElement('iframe');
var hiddenIframeClass = 'chartjs-hidden-iframe';
if (hiddenIframe.classlist) {
// can use classlist
hiddenIframe.classlist.add(hiddenIframeClass);
} else {
hiddenIframe.setAttribute('class', hiddenIframeClass)
}
// Set the style
hiddenIframe.style.width = '100%';
hiddenIframe.style.display = 'block';
hiddenIframe.style.border = 0;
hiddenIframe.style.height = 0;
hiddenIframe.style.margin = 0;
hiddenIframe.style.position = 'absolute';
hiddenIframe.style.left = 0;
hiddenIframe.style.right = 0;
hiddenIframe.style.top = 0;
hiddenIframe.style.bottom = 0;
// Insert the iframe so that contentWindow is available
node.insertBefore(hiddenIframe, node.firstChild);
var timer = 0;
(hiddenIframe.contentWindow || hiddenIframe).onresize = function() {
if (callback) {
callback();
}
}
},
removeResizeListener = helpers.removeResizeListener = function(node) {
var hiddenIframe = node.querySelector('.chartjs-hidden-iframe');
// Remove the resize detect iframe
if (hiddenIframe) {
hiddenIframe.remove();
}
},
isArray = helpers.isArray = function(obj) {
if (!Array.isArray) {
return Object.prototype.toString.call(arg) === '[object Array]';

45
src/core/core.js
View File

@ -19,7 +19,6 @@
//Occupy the global variable of Chart, and create a simple base class
var Chart = function(context, config) {
var chart = this;
this.config = config;
// Support a jQuery'd canvas element
@ -32,32 +31,36 @@
context = context.getContext("2d");
}
this.ctx = context;
this.canvas = context.canvas;
this.ctx = context;
// Figure out what the size of the chart will be.
// If the canvas has a specified width and height, we use those else
// we look to see if the canvas node has a CSS width and height.
// If there is still no height, fill the parent container
this.width = context.canvas.width || parseInt(Chart.helpers.getStyle(context.canvas, 'width')) || Chart.helpers.getMaximumWidth(context.canvas);
this.height = context.canvas.height || parseInt(Chart.helpers.getStyle(context.canvas, 'height')) || Chart.helpers.getMaximumHeight(context.canvas);
//Variables global to the chart
var computeDimension = function(element, dimension) {
if (element['offset' + dimension]) {
return element['offset' + dimension];
} else {
return document.defaultView.getComputedStyle(element).getPropertyValue(dimension);
}
};
var width = this.width = computeDimension(context.canvas, 'Width') || context.canvas.width;
var height = this.height = computeDimension(context.canvas, 'Height') || context.canvas.height;
// Firefox requires this to work correctly
context.canvas.width = width;
context.canvas.height = height;
width = this.width = context.canvas.width;
height = this.height = context.canvas.height;
this.aspectRatio = this.width / this.height;
//High pixel density displays - multiply the size of the canvas height/width by the device pixel ratio, then scale.
if (isNaN(this.aspectRatio) || isFinite(this.aspectRatio) === false) {
// If the canvas has no size, try and figure out what the aspect ratio will be.
// Some charts prefer square canvases (pie, radar, etc). If that is specified, use that
// else use the canvas default ratio of 2
this.aspectRatio = config.aspectRatio !== undefined ? config.aspectRatio : 2;
}
// High pixel density displays - multiply the size of the canvas height/width by the device pixel ratio, then scale.
Chart.helpers.retinaScale(this);
// Always bind this so that if the responsive state changes we still work
var _this = this;
Chart.helpers.addResizeListener(context.canvas.parentNode, function() {
if (config.options.responsive) {
_this.controller.resize();
}
});
if (config) {
this.controller = new Chart.Controller(this);
return this.controller;