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Image Viewer

Image viewer

当前为 2014-05-04 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name       Image Viewer
  3. // @namespace  https://gist.github.com/bradenbest/04bd0fc2d57ec650449f
  4. // @version    1.2.0
  5. // @description  Image viewer
  6. // @copyright  2014 - present, Braden Best
  7. // ==/UserScript==
  8.  
  9. /*
  10.  * Web image viewer script by Braden Best
  11.  * To use: 
  12.  *   inject this script into any page, and RIGHT-CLICK on the image you want to view full-size
  13.  *     while the image is "open", you can drag it around to pan instead of scrolling
  14.  *     There is a close button, and a full URL link above the image
  15.  *     You can press Esc to close the image without the need for clicking the close button
  16.  * Special thanks to Cyberdevil for providing suggestions
  17.  *   Escape key
  18.  *   Provide Direct URL to image
  19.  *   image is draggable
  20.  *   Don't let it interfere with default click events
  21.  */
  22.  
  23. (function(){
  24.   function push(url){
  25.     var img = document.createElement('img'),
  26.         img_helper = document.createElement('div');
  27.     // Image
  28.     img.src = url;
  29.     img.style.position = 'absolute';
  30.     img.style.left = '0px';
  31.     img.style.top  = '60px';
  32.     img.style.zIndex = '2147483647'; // this is to push it above everything else, so the NG navbar doesn't float over it.
  33.     img.className = 'img_viewer';
  34.     img.draggable = 'false';
  35.     img.dragging = 0;
  36.     img.mousepos = [0,0];
  37.     // Image helper
  38.     img_helper.innerHTML = "Click here to close image<hr><a target=\"_blank\" href=\"" + url + "\">Direct URL</a>";
  39.     img_helper.style.position = 'absolute';
  40.     img_helper.style.left = '0px';
  41.     img_helper.style.top  = '0px';
  42.     img_helper.style.margin = '0';
  43.     img_helper.style.padding = '5px 0';
  44.     img_helper.style.width = '100%';
  45.     img_helper.style.height='50px';
  46.     img_helper.style.background = '#fff';
  47.     img_helper.style.color = '#000';
  48.     img_helper.style.fontSize = '12px';
  49.     img_helper.style.textAlign = 'center';
  50.     img_helper.style.zIndex = '2147483647'; // The absolute maximum
  51.     img_helper.className = 'img_viewer';
  52.     // append to body
  53.     document.body.appendChild(img);
  54.     document.body.appendChild(img_helper);
  55.     document.body.scrollTop = 0;
  56.     // helper on-click
  57.     img_helper.onclick = function(){
  58.       document.body.removeChild(img);
  59.       document.body.removeChild(img_helper);
  60.       img_helper.onclick = null;
  61.     }
  62.     img.onmousedown = function(evt){
  63.       this.dragging = 1;
  64.       this.mousepos[0] = (evt.clientX || evt.pageX);
  65.       this.mousepos[1] = (evt.clientY || evt.pageY);
  66.     }
  67.     img.onmouseup = function(evt){
  68.       this.dragging = 0;
  69.     }
  70.     img.onmousemove = function(evt){ // Hoo boy, that was pretty difficult to figure out
  71.       if(this.dragging){
  72.         lastX = this.mousepos[0];
  73.         curX = (evt.clientX || evt.pageX);
  74.         lastY = this.mousepos[1];
  75.         curY = (evt.clientY || evt.pageY);
  76.         if(!(lastX == curX && lastY == curY)){
  77.           console.log("mouse has moved")
  78.           if(curX > lastX){
  79.             this.style.left = (parseInt(this.style.left) + (curX - lastX)) + 'px';
  80.           }
  81.           if(curX < lastX){
  82.             this.style.left = (parseInt(this.style.left) - (lastX - curX)) + 'px';
  83.           }
  84.           if(curY > lastY){
  85.             this.style.top = (parseInt(this.style.top) + (curY - lastY)) + 'px';
  86.           }
  87.           if(curY < lastY){
  88.             this.style.top = (parseInt(this.style.top) - (lastY - curY)) + 'px';
  89.           }
  90.         }
  91.         this.mousepos[0] = curX;
  92.         this.mousepos[1] = curY;
  93.       }
  94.       return false;
  95.     }
  96.   }
  97.  
  98.   function clear(){
  99.     var imgs = document.querySelectorAll('.img_viewer');
  100.     if(imgs[0]) {
  101.       for(var i = 0; i < imgs.length; i++){
  102.         document.body.removeChild(imgs[i]);
  103.       }
  104.     } else {
  105.       console.log("No images generated by this script were found");
  106.     }
  107.   }
  108.  
  109.   var imgs = document.querySelectorAll('img[src]'), i;
  110.   if(imgs[0]){
  111.     for(i = 0; i < imgs.length; i++){
  112.       if(imgs[i].src){
  113.         imgs[i].oncontextmenu = function(){
  114.           push(this.src);
  115.           return false;
  116.         }
  117.       }
  118.     }
  119.   } else {
  120.     console.log("Something has gone wrong!");
  121.   }
  122.   document.body.onkeydown = function(evt){
  123.     if(evt.keyCode == 27){ // Escape key
  124.       clear();
  125.     }
  126.   }
  127.   console.log("Image Viewer successfully started up!");
  128.   console.log("Try right-clicking an image");
  129. })();