438 lines
11 KiB
JavaScript
438 lines
11 KiB
JavaScript
/**
|
|
* ImageFlow 0.9
|
|
*
|
|
* This code is based on Michael L. Perrys Cover flow in Javascript.
|
|
* For he wrote that "You can take this code and use it as your own" [1]
|
|
* this is my attempt to improve some things. Feel free to use it! If
|
|
* you have any questions on it leave me a message in my shoutbox [2].
|
|
*
|
|
* The reflection is generated server-sided by a slightly hacked
|
|
* version of Richard Daveys easyreflections [3] written in PHP.
|
|
*
|
|
* The mouse wheel support is an implementation of Adomas Paltanavicius
|
|
* JavaScript mouse wheel code [4].
|
|
*
|
|
* Thanks to Stephan Droste ImageFlow is now compatible with Safari 1.x.
|
|
*
|
|
*
|
|
* [1] http://www.adventuresinsoftware.com/blog/?p=104#comment-1981
|
|
* [2] http://shoutbox.finnrudolph.de/
|
|
* [3] http://reflection.corephp.co.uk/v2.php
|
|
* [4] http://adomas.org/javascript-mouse-wheel/
|
|
*/
|
|
|
|
|
|
/* Configuration variables */
|
|
var conf_reflection_p = 0.0; // Sets the height of the reflection in % of the source image
|
|
var conf_focus = 4; // Sets the numbers of images on each side of the focussed one
|
|
var conf_slider_width = 14; // Sets the px width of the slider div
|
|
var conf_images_cursor = 'pointer'; // Sets the cursor type for all images default is 'default'
|
|
var conf_slider_cursor = 'default'; // Sets the slider cursor type: try "e-resize" default is 'default'
|
|
|
|
/* Id names used in the HTML */
|
|
var conf_imageflow = 'imageflow'; // Default is 'imageflow'
|
|
var conf_loading = 'loading'; // Default is 'loading'
|
|
var conf_images = 'images'; // Default is 'images'
|
|
var conf_captions = 'captions'; // Default is 'captions'
|
|
var conf_scrollbar = 'scrollbar'; // Default is 'scrollbar'
|
|
var conf_slider = 'slider'; // Default is 'slider'
|
|
|
|
/* Define global variables */
|
|
var caption_id = 0;
|
|
var new_caption_id = 0;
|
|
var current = 0;
|
|
var target = 0;
|
|
var mem_target = 0;
|
|
var timer = 0;
|
|
var array_images = new Array();
|
|
var new_slider_pos = 0;
|
|
var dragging = false;
|
|
var dragobject = null;
|
|
var dragx = 0;
|
|
var posx = 0;
|
|
var new_posx = 0;
|
|
var xstep = 150;
|
|
|
|
|
|
function step()
|
|
{
|
|
switch (target < current-1 || target > current+1)
|
|
{
|
|
case true:
|
|
moveTo(current + (target-current)/3);
|
|
window.setTimeout(step, 50);
|
|
timer = 1;
|
|
break;
|
|
|
|
default:
|
|
timer = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
function glideTo(x, new_caption_id)
|
|
{
|
|
/* Animate gliding to new x position */
|
|
target = x;
|
|
mem_target = x;
|
|
if (timer == 0)
|
|
{
|
|
window.setTimeout(step, 50);
|
|
timer = 1;
|
|
}
|
|
|
|
/* Display new caption */
|
|
caption_id = new_caption_id;
|
|
caption = img_div.childNodes.item(array_images[caption_id]).getAttribute('alt');
|
|
if (caption == '') caption = ' ';
|
|
caption_div.innerHTML = caption;
|
|
|
|
/*swatchImg() */
|
|
currentImg=caption_id;
|
|
|
|
/* Set scrollbar slider to new position */
|
|
if (dragging == false)
|
|
{
|
|
new_slider_pos = (scrollbar_width * (-(x*100/((max-1)*xstep))) / 100) - new_posx;
|
|
slider_div.style.marginLeft = (new_slider_pos - conf_slider_width) + 'px';
|
|
}
|
|
}
|
|
|
|
function moveTo(x)
|
|
{
|
|
current = x;
|
|
var zIndex = max;
|
|
|
|
/* Main loop */
|
|
for (var index = 0; index < max; index++)
|
|
{
|
|
var image = img_div.childNodes.item(array_images[index]);
|
|
var current_image = index * -xstep;
|
|
|
|
/* Don't display images that are not conf_focussed */
|
|
if ((current_image+max_conf_focus) < mem_target || (current_image-max_conf_focus) > mem_target)
|
|
{
|
|
image.style.visibility = 'hidden';
|
|
image.style.display = 'none';
|
|
}
|
|
else
|
|
{
|
|
var z = Math.sqrt(10000 + x * x) + 100;
|
|
var xs = x / z * size + size;
|
|
|
|
/* Still hide images until they are processed, but set display style to block */
|
|
image.style.display = 'block';
|
|
|
|
/* Process new image height and image width */
|
|
var new_img_h = (image.h / image.w * image.pc) / z * size;
|
|
switch ( new_img_h > max_height )
|
|
{
|
|
case false:
|
|
var new_img_w = image.pc / z * size;
|
|
break;
|
|
|
|
default:
|
|
new_img_h = max_height;
|
|
var new_img_w = image.w * new_img_h / image.h;
|
|
break;
|
|
}
|
|
var new_img_top = (images_width * 0.34 - new_img_h) + images_top + ((new_img_h / (conf_reflection_p + 1)) * conf_reflection_p);
|
|
|
|
/* Set new image properties */
|
|
image.style.left = xs - (image.pc / 2) / z * size + images_left + 'px';
|
|
if(new_img_w && new_img_h)
|
|
{
|
|
image.style.height = new_img_h + 'px';
|
|
image.style.width = new_img_w + 'px';
|
|
image.style.top = new_img_top + 'px';
|
|
}
|
|
image.style.visibility = 'visible';
|
|
|
|
/* Set image layer through zIndex */
|
|
switch ( x < 0 )
|
|
{
|
|
case true:
|
|
zIndex++;
|
|
break;
|
|
|
|
default:
|
|
zIndex = zIndex - 1;
|
|
break;
|
|
}
|
|
|
|
/* Change zIndex and onclick function of the focussed image */
|
|
switch ( image.i == caption_id )
|
|
{
|
|
case false:
|
|
image.onclick = function() { glideTo(this.x_pos, this.i); }
|
|
break;
|
|
|
|
default:
|
|
zIndex = zIndex + 1;
|
|
image.onclick = function() { document.location = this.url; }
|
|
break;
|
|
}
|
|
image.style.zIndex = zIndex;
|
|
}
|
|
x += xstep;
|
|
}
|
|
}
|
|
|
|
/* Main function */
|
|
function refresh(onload)
|
|
{
|
|
/* Cache document objects in global variables */
|
|
imageflow_div = document.getElementById(conf_imageflow);
|
|
img_div = document.getElementById(conf_images);
|
|
scrollbar_div = document.getElementById(conf_scrollbar);
|
|
slider_div = document.getElementById(conf_slider);
|
|
caption_div = document.getElementById(conf_captions);
|
|
|
|
/* Cache global variables, that only change on refresh */
|
|
images_width = img_div.offsetWidth;
|
|
images_top = imageflow_div.offsetTop;
|
|
images_left = imageflow_div.offsetLeft;
|
|
max_conf_focus = conf_focus * xstep;
|
|
size = images_width * 0.5;
|
|
scrollbar_width = images_width * 0.6;
|
|
conf_slider_width = conf_slider_width * 0.5;
|
|
max_height = images_width * 0.51;
|
|
|
|
/* Change imageflow div properties */
|
|
// imageflow_div.style.height = max_height + 'px';
|
|
|
|
/* Change images div properties */
|
|
img_div.style.height = images_width * 0.338 + 'px';
|
|
|
|
/* Change captions div properties */
|
|
caption_div.style.width = images_width + 'px';
|
|
caption_div.style.marginTop = images_width * 0.03 + 'px';
|
|
caption_div.style.marginTop = images_width * 0.06 + 'px';
|
|
caption_div.style.marginTop = 20 + 'px';
|
|
|
|
/* Change scrollbar div properties */
|
|
scrollbar_div.style.marginTop = images_width * 0.02 + 'px';
|
|
scrollbar_div.style.marginTop = 15 + 'px';
|
|
scrollbar_div.style.marginLeft = images_width * 0.2 + 'px';
|
|
scrollbar_div.style.width = scrollbar_width + 'px';
|
|
|
|
/* Set slider attributes */
|
|
slider_div.onmousedown = function () { dragstart(this); };
|
|
slider_div.style.cursor = conf_slider_cursor;
|
|
|
|
/* Cache EVERYTHING! */
|
|
max = img_div.childNodes.length;
|
|
var i = 0;
|
|
for (var index = 0; index < max; index++)
|
|
{
|
|
var image = img_div.childNodes.item(index);
|
|
if (image.nodeType == 1)
|
|
{
|
|
array_images[i] = index;
|
|
|
|
/* Set image onclick by adding i and x_pos as attributes! */
|
|
image.onclick = function() { glideTo(this.x_pos, this.i); }
|
|
image.x_pos = (-i * xstep);
|
|
image.i = i;
|
|
|
|
/* Add width and height as attributes ONLY once onload */
|
|
if(onload == true)
|
|
{
|
|
image.w = slideshowImages[i][2];
|
|
image.h = slideshowImages[i][3];
|
|
}
|
|
|
|
/* Check source image format. Get image height minus reflection height! */
|
|
switch ((image.w + 1) > (image.h / (conf_reflection_p + 1)))
|
|
{
|
|
/* Landscape format */
|
|
case true:
|
|
image.pc = 155;
|
|
break;
|
|
|
|
/* Portrait and square format */
|
|
default:
|
|
image.pc = 112;
|
|
image.pc = 92;
|
|
break;
|
|
}
|
|
|
|
/* Set ondblclick event */
|
|
image.url = image.getAttribute('longdesc');
|
|
image.ondblclick = function() { document.location = this.url; }
|
|
|
|
/* Set image cursor type */
|
|
image.style.cursor = conf_images_cursor;
|
|
|
|
i++;
|
|
}
|
|
}
|
|
max = array_images.length;
|
|
|
|
/* Display images in current order */
|
|
moveTo(current);
|
|
glideTo(current, caption_id);
|
|
}
|
|
|
|
/* Show/hide element functions */
|
|
function iShow(id)
|
|
{
|
|
var element = document.getElementById(id);
|
|
element.style.visibility = 'visible';
|
|
}
|
|
function iHide(id)
|
|
{
|
|
var element = document.getElementById(id);
|
|
element.style.visibility = 'hidden';
|
|
element.style.display = 'none';
|
|
}
|
|
|
|
/* Hide loading bar, show content and initialize mouse event listening after loading */
|
|
window.onload = function()
|
|
{
|
|
if(document.getElementById(conf_imageflow))
|
|
{
|
|
iHide(conf_loading);
|
|
refresh(true);
|
|
iShow(conf_images);
|
|
iShow(conf_scrollbar);
|
|
initMouseWheel();
|
|
initMouseDrag();
|
|
}
|
|
}
|
|
|
|
/* Refresh ImageFlow on window resize */
|
|
window.onresize = function()
|
|
{
|
|
if(document.getElementById(conf_imageflow)) refresh();
|
|
}
|
|
|
|
/* Fixes the back button issue */
|
|
window.onunload = function()
|
|
{
|
|
document = null;
|
|
}
|
|
|
|
|
|
/* Handle the wheel angle change (delta) of the mouse wheel */
|
|
function handle(delta)
|
|
{
|
|
var change = false;
|
|
switch (delta > 0)
|
|
{
|
|
case true:
|
|
if(caption_id >= 1)
|
|
{
|
|
target = target + xstep;
|
|
new_caption_id = caption_id - 1;
|
|
change = true;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
if(caption_id < (max-1))
|
|
{
|
|
target = target - xstep;
|
|
new_caption_id = caption_id + 1;
|
|
change = true;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Glide to next (mouse wheel down) / previous (mouse wheel up) image */
|
|
if (change == true)
|
|
{
|
|
glideTo(target, new_caption_id);
|
|
}
|
|
}
|
|
|
|
/* Event handler for mouse wheel event */
|
|
function wheel(event)
|
|
{
|
|
var delta = 0;
|
|
if (!event) event = window.event;
|
|
if (event.wheelDelta)
|
|
{
|
|
delta = event.wheelDelta / 120;
|
|
}
|
|
else if (event.detail)
|
|
{
|
|
delta = -event.detail / 3;
|
|
}
|
|
if (delta) handle(delta);
|
|
if (event.preventDefault) event.preventDefault();
|
|
event.returnValue = false;
|
|
}
|
|
|
|
/* Initialize mouse wheel event listener */
|
|
function initMouseWheel()
|
|
{
|
|
if(window.addEventListener) imageflow_div.addEventListener('DOMMouseScroll', wheel, false);
|
|
imageflow_div.onmousewheel = wheel;
|
|
}
|
|
|
|
/* This function is called to drag an object (= slider div) */
|
|
function dragstart(element)
|
|
{
|
|
dragobject = element;
|
|
dragx = posx - dragobject.offsetLeft + new_slider_pos;
|
|
}
|
|
|
|
/* This function is called to stop dragging an object */
|
|
function dragstop()
|
|
{
|
|
dragobject = null;
|
|
dragging = false;
|
|
}
|
|
|
|
/* This function is called on mouse movement and moves an object (= slider div) on user action */
|
|
function drag(e)
|
|
{
|
|
posx = document.all ? window.event.clientX : e.pageX;
|
|
if(dragobject != null)
|
|
{
|
|
dragging = true;
|
|
new_posx = (posx - dragx) + conf_slider_width;
|
|
|
|
/* Make sure, that the slider is moved in proper relation to previous movements by the glideTo function */
|
|
if(new_posx < ( - new_slider_pos)) new_posx = - new_slider_pos;
|
|
if(new_posx > (scrollbar_width - new_slider_pos)) new_posx = scrollbar_width - new_slider_pos;
|
|
|
|
var slider_pos = (new_posx + new_slider_pos);
|
|
var step_width = slider_pos / ((scrollbar_width) / (max-1));
|
|
var image_number = Math.round(step_width);
|
|
var new_target = (image_number) * -xstep;
|
|
var new_caption_id = image_number;
|
|
|
|
dragobject.style.left = new_posx + 'px';
|
|
glideTo(new_target, new_caption_id);
|
|
}
|
|
}
|
|
|
|
/* Initialize mouse event listener */
|
|
function initMouseDrag()
|
|
{
|
|
document.onmousemove = drag;
|
|
document.onmouseup = dragstop;
|
|
|
|
/* Avoid text and image selection while dragging */
|
|
document.onselectstart = function ()
|
|
{
|
|
if (dragging == true)
|
|
{
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
function getKeyCode(event)
|
|
{
|
|
event = event || window.event;
|
|
return event.keyCode;
|
|
}
|
|
|