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import { DATA_PREVIEW } from './constants';
import {
assign,
forEach,
getData,
getTransforms,
removeData,
setData,
setStyle,
} from './utilities';
export default {
initPreview() {
const { element, crossOrigin } = this;
const { preview } = this.options;
const url = crossOrigin ? this.crossOriginUrl : this.url;
const alt = element.alt || 'The image to preview';
const image = document.createElement('img');
if (crossOrigin) {
image.crossOrigin = crossOrigin;
}
image.src = url;
image.alt = alt;
this.viewBox.appendChild(image);
this.viewBoxImage = image;
if (!preview) {
return;
}
let previews = preview;
if (typeof preview === 'string') {
previews = element.ownerDocument.querySelectorAll(preview);
} else if (preview.querySelector) {
previews = [preview];
}
this.previews = previews;
forEach(previews, (el) => {
const img = document.createElement('img');
// Save the original size for recover
setData(el, DATA_PREVIEW, {
width: el.offsetWidth,
height: el.offsetHeight,
html: el.innerHTML,
});
if (crossOrigin) {
img.crossOrigin = crossOrigin;
}
img.src = url;
img.alt = alt;
/**
* Override img element styles
* Add `display:block` to avoid margin top issue
* Add `height:auto` to override `height` attribute on IE8
* (Occur only when margin-top <= -height)
*/
img.style.cssText = (
'display:block;'
+ 'width:100%;'
+ 'height:auto;'
+ 'min-width:0!important;'
+ 'min-height:0!important;'
+ 'max-width:none!important;'
+ 'max-height:none!important;'
+ 'image-orientation:0deg!important;"'
);
el.innerHTML = '';
el.appendChild(img);
});
},
resetPreview() {
forEach(this.previews, (element) => {
const data = getData(element, DATA_PREVIEW);
setStyle(element, {
width: data.width,
height: data.height,
});
element.innerHTML = data.html;
removeData(element, DATA_PREVIEW);
});
},
preview() {
const { imageData, canvasData, cropBoxData } = this;
const { width: cropBoxWidth, height: cropBoxHeight } = cropBoxData;
const { width, height } = imageData;
const left = cropBoxData.left - canvasData.left - imageData.left;
const top = cropBoxData.top - canvasData.top - imageData.top;
if (!this.cropped || this.disabled) {
return;
}
setStyle(this.viewBoxImage, assign({
width,
height,
}, getTransforms(assign({
translateX: -left,
translateY: -top,
}, imageData))));
forEach(this.previews, (element) => {
const data = getData(element, DATA_PREVIEW);
const originalWidth = data.width;
const originalHeight = data.height;
let newWidth = originalWidth;
let newHeight = originalHeight;
let ratio = 1;
if (cropBoxWidth) {
ratio = originalWidth / cropBoxWidth;
newHeight = cropBoxHeight * ratio;
}
if (cropBoxHeight && newHeight > originalHeight) {
ratio = originalHeight / cropBoxHeight;
newWidth = cropBoxWidth * ratio;
newHeight = originalHeight;
}
setStyle(element, {
width: newWidth,
height: newHeight,
});
setStyle(element.getElementsByTagName('img')[0], assign({
width: width * ratio,
height: height * ratio,
}, getTransforms(assign({
translateX: -left * ratio,
translateY: -top * ratio,
}, imageData))));
});
},
};
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