mirror of
https://github.com/flynx/ImageGrid.git
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350 lines
8.4 KiB
JavaScript
Executable File
350 lines
8.4 KiB
JavaScript
Executable File
/**********************************************************************
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*
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*
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*
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**********************************************************************/
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// A stub image, also here for documentation...
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var STUB_IMAGE_DATA = {
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// Entity GID...
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id: 'STUB-GID',
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// Entity type
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//
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// can be:
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// - 'image'
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// - 'group'
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type: 'image',
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// Entity state
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//
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// can be:
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// - 'single'
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// - 'grouped'
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// - 'hidden'
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// - ...
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state: 'single',
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// Creation time...
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ctime: 0,
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// Original path...
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path: './images/sizes/900px/SIZE.jpg',
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// Previews...
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// NOTE: the actual values depend on specific image and can be
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// any size...
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preview: {
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'150px': './images/sizes/150px/SIZE.jpg',
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'350px': './images/sizes/350px/SIZE.jpg',
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'900px': './images/sizes/900px/SIZE.jpg',
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},
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// Classes
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// XXX currently unused...
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classes: '',
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// Image orientation (optional)
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//
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// can be:
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// - null/undefined - same as 0
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// - 0 (default) - load as-is
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// - 90 - rotate 90deg CW
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// - 180 - rotate 180deg CW
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// - 270 - rotate 270deg CW (90deg CCW)
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//
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// NOTE: use orientationExif2ImageGrid(..) to convert from EXIF
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// orientation format to ImageGrid format...
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orientation: 0,
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// Image flip state (optional)
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//
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// can be:
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// - null/undefined
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// - array
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//
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// can contain:
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// - 'vertical'
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// - 'horizontal'
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//
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// NOTE: use orientationExif2ImageGrid(..) to convert from EXIF
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// orientation format to ImageGrid format...
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flipped: null,
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// Image comment (optional)
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//
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// can be:
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// - null/undefined
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// - string
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comment: null,
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// List of image tags (optional)
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//
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// can be:
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// - null/undefined
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// - array
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tags: null,
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}
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// List of function that update image state...
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//
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// these are called by updateImage(..) after the image is created.
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//
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// each function must be of the form:
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// updateImage(gid, image) -> image
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//
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var IMAGE_UPDATERS = []
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/*********************************************************************/
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// XXX Constructors...
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/*********************************************************************/
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// Run all the image update functions registered in IMAGE_UPDATERS, on
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// an image...
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//
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function updateImageIndicators(gid, image){
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gid = gid == null ? getImageGID() : gid
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image = image == null ? getImage() : $(image)
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IMAGE_UPDATERS.forEach(function(update){
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update(gid, image)
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})
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return image
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}
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// helper...
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function _loadImagePreviewURL(image, url){
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// pre-cache and load image...
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// NOTE: this will make images load without a blackout...
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var img = new Image()
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img.onload = function(){
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image.css({
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'background-image': 'url("'+ url +'")',
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})
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}
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img.src = url
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return img
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}
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// Update an image element
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//
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// NOTE: care must be taken to reset ALL attributes an image can have,
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// a common bug if this is not done correctly, is that some settings
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// may leak to newly loaded images...
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function updateImage(image, gid, size, sync){
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image = image == null ? getImage() : $(image)
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sync = sync == null ? CONFIG.load_img_sync : sync
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var old_gid = getImageGID(image)
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// same image -- update...
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if(old_gid == gid || gid == null){
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gid = old_gid
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// reuse for different image -- reconstruct...
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} else {
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// remove old marks...
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if(typeof(old_gid) == typeof('str')){
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getImageMarks(old_gid).remove()
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}
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// reset gid...
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image
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.attr('gid', JSON.stringify(gid))
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.css({
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// clear the old preview...
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'background-image': '',
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})
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}
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size = size == null ? getVisibleImageSize('max') : size
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// get the image data...
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var img_data = IMAGES[gid]
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if(img_data == null){
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img_data = STUB_IMAGE_DATA
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}
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/* XXX does not seem to be needing this...
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// set the current class...
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if(gid == DATA.current){
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image.addClass('current')
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} else {
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image.removeClass('current')
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}
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*/
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// preview...
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var p_url = getBestPreview(gid, size).url
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// update the preview if it's a new image or...
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if(old_gid != gid
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// the new preview (purl) is different to current...
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|| image.css('background-image').indexOf(encodeURI(p_url)) < 0){
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// sync load...
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if(sync){
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_loadImagePreviewURL(image, p_url)
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// async load...
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} else {
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// NOTE: storing the url in .data() makes the image load the
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// last requested preview and in a case when we manage to
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// call updateImage(...) on the same element multiple times
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// before the previews get loaded...
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// ...setting the data().loading is sync while loading an
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// image is not, and if several loads are done in sequence
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// there is no guarantee that they will happen in the same
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// order as requested...
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image.data().loading = p_url
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setTimeout(function(){
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_loadImagePreviewURL(image, image.data().loading)
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}, 0)
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}
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}
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// main attrs...
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image
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.attr({
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order: DATA.order.indexOf(gid),
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orientation: img_data.orientation == null ? 0 : img_data.orientation,
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})
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// flip...
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setImageFlipState(image, img_data.flipped == null ? [] : img_data.flipped)
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// NOTE: this only has effect on non-square image blocks...
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correctImageProportionsForRotation(image)
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// marks and other indicators...
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updateImageIndicators(gid, image)
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return image
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}
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// Same as updateImage(...) but will update all loaded images.
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//
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// If list is passed this will update only the images in the list. The
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// list can contain either gids or image elements.
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//
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// If CONFIG.update_sort_enabled is set, this will prioritize images by
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// distance from current image, loading the closest images first...
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//
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// If CONFIG.update_sync is set, this will run asynchronously.
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function updateImages(list, size, cmp){
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var deferred = $.Deferred()
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function _worker(){
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list = list == null ? $('.image') : $(list)
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size = size == null ? getVisibleImageSize('max') : size
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function _update(_, e){
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var img = typeof(e) == typeof('str') ? getImage(e) : $(e)
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if(img.length > 0){
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updateImage(img, null, size)
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}
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}
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// sorted run...
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if(CONFIG.update_sort_enabled && cmp != false){
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cmp = cmp == null ?
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makeGIDDistanceCmp(getImageGID(), function(e){
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return typeof(e) == typeof('str') ? e : getImageGID(e)
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})
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// XXX this is more correct but is slow...
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//makeGIDRibbonDistanceCmp(getImageGID(), getImageGID)
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: cmp
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deferred.resolve(list
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// sort images by distance from current, so as to update what
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// the user is looking at first...
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.sort(cmp)
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.map(_update))
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// do a fast run w.o. sorting images...
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} else {
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deferred.resolve(list.map(_update))
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}
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}
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if(CONFIG.update_sync){
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_worker()
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} else {
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setTimeout(_worker, 0)
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}
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return deferred
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}
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// Compensate for viewer proportioned and rotated images.
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//
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// This will set the margins so as to make the rotated image offset the
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// same space as it is occupying visually...
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//
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// NOTE: this is not needed for square image blocks.
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// NOTE: if an image block is square, this will remove the margins.
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function correctImageProportionsForRotation(images, container){
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container = container == null ? $('.viewer') : container
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var W = container.innerWidth()
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var H = container.innerHeight()
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var viewer_p = W > H ? 'landscape' : 'portrait'
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return $(images).each(function(i, e){
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var image = $(this)
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// orientation...
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var o = image.attr('orientation')
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o = o == null ? 0 : o
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var w = image.outerWidth()
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var h = image.outerHeight()
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// non-square image...
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if(w != h){
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var image_p = w > h ? 'landscape' : 'portrait'
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// when the image is turned 90deg/270deg and its
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// proportions are the same as the screen...
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if((o == 90 || o == 270) && image_p == viewer_p){
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image.css({
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width: h,
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height: w,
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})
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image.css({
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'margin-top': -((w - h)/2),
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'margin-bottom': -((w - h)/2),
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'margin-left': (w - h)/2,
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'margin-right': (w - h)/2,
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})
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} else if((o == 0 || o == 180) && image_p != viewer_p){
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image.css({
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width: h,
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height: w,
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})
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image.css({
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'margin': '',
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})
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}
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// square image...
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} else {
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image.css({
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'margin': '',
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})
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}
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})
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}
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/**********************************************************************
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* vim:set ts=4 sw=4 : */
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