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/*
* Copyright (c) 2015
*
* This file is licensed under the Affero General Public License version 3
* or later.
*
* See the COPYING-README file.
*
*/
(function () {
SidebarPreviewManager = function (fileList) {
this._fileList = fileList;
};
SidebarPreviewManager.prototype = {
loadPreview: function (model, $thumbnailDiv, $thumbnailContainer) {
// todo allow plugins to register custom handlers by mimetype
this.fallbackPreview(model, $thumbnailDiv, $thumbnailContainer);
},
// previews for images and mimetype icons
fallbackPreview: function (model, $thumbnailDiv, $thumbnailContainer) {
var isImage = model.isImage();
var maxImageWidth = $thumbnailContainer.parent().width() + 50; // 50px for negative margins
var maxImageHeight = maxImageWidth / (16 / 9);
var smallPreviewSize = 75;
var isLandscape = function (img) {
return img.width > (img.height * 1.2);
};
var isSmall = function (img) {
return (img.width * 1.1) < (maxImageWidth * window.devicePixelRatio);
};
var getTargetHeight = function (img) {
if (isImage) {
var targetHeight = img.height / window.devicePixelRatio;
if (targetHeight <= smallPreviewSize) {
targetHeight = smallPreviewSize;
}
return targetHeight;
} else {
return smallPreviewSize;
}
};
var getTargetRatio = function (img) {
var ratio = img.width / img.height;
if (ratio > 16 / 9) {
return ratio;
} else {
return 16 / 9;
}
};
this._fileList.lazyLoadPreview({
path: model.getFullPath(),
mime: model.get('mimetype'),
etag: model.get('etag'),
y: isImage ? maxImageHeight : smallPreviewSize,
x: isImage ? maxImageWidth : smallPreviewSize,
a: isImage ? 1 : null,
mode: isImage ? 'cover' : null,
callback: function (previewUrl, img) {
$thumbnailDiv.previewImg = previewUrl;
// as long as we only have the mimetype icon, we only save it in case there is no preview
if (!img) {
return;
}
$thumbnailDiv.removeClass('icon-loading icon-32');
var targetHeight = getTargetHeight(img);
if (isImage && targetHeight > smallPreviewSize) {
$thumbnailContainer.addClass((isLandscape(img) && !isSmall(img)) ? 'landscape' : 'portrait');
$thumbnailContainer.addClass('image');
}
// only set background when we have an actual preview
// when we don't have a preview we show the mime icon in the error handler
$thumbnailDiv.css({
'background-image': 'url("' + previewUrl + '")',
height: (targetHeight > smallPreviewSize) ? 'auto' : targetHeight,
'max-height': isSmall(img) ? targetHeight : null
});
var targetRatio = getTargetRatio(img);
$thumbnailDiv.find('.stretcher').css({
'padding-bottom': (100 / targetRatio) + '%'
});
},
error: function () {
$thumbnailDiv.removeClass('icon-loading icon-32');
$thumbnailContainer.removeClass('image'); //fall back to regular view
$thumbnailDiv.css({
'background-image': 'url("' + $thumbnailDiv.previewImg + '")'
});
}
});
}
};
OCA.Files.SidebarPreviewManager = SidebarPreviewManager;
})();
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