X-Git-Url: https://git.mdrn.pl/redakcja.git/blobdiff_plain/01465cea212ef30b7e580a3ff7e30a82b13ae8f8..c51a084ecf2fefb54ef9f74b21beff437ac9a4bb:/project/static/js/views/gallery.js

diff --git a/project/static/js/views/gallery.js b/project/static/js/views/gallery.js
index 390aaadb..95736565 100644
--- a/project/static/js/views/gallery.js
+++ b/project/static/js/views/gallery.js
@@ -7,7 +7,7 @@ var ImageGalleryView = View.extend({
   
   init: function(element, model, parent, template) 
   {
-    this.currentPage = 0;
+    this.currentPage = -1;
     
     this._super(element, model, template);
     this.parent = parent;
@@ -22,23 +22,60 @@ var ImageGalleryView = View.extend({
   },
   
   modelDataChanged: function(property, value) 
-  {
-    $.log('updating pages', property, value);
+  {    
     if( property == 'data')
-    {        
-        this.gotoPage(this.currentPage);        
-        this.element.html(render_template(this.template, this));        
+    {
+        this.render();
+        this.gotoPage(this.currentPage);
     }   
   },
 
-  gotoPage: function(index) {
+  gotoPage: function(index) 
+  {
      if (index < 0) 
          index = 0;
-
-     var n = this.model.get('pages').length;
+    
+     var n = this.$pages.length;
      if (index >= n) index = n-1;
 
+     if( (this.currentPage == index) )
+         return;
+
+     var cpage = this.$currentPage();
+
+     if(cpage) {
+         var offset = this.pageViewOffset(cpage);
+         this.cleanPage(cpage);
+     }
+     
      this.currentPage = index;
+
+     cpage = this.$currentPage()
+     this.renderImage(cpage, cpage.attr('ui:model'));
+
+     if(offset) {
+         cpage.css({top: offset.y, left: offset.x});
+     }
+
+     var self = this;
+     $('img', cpage).bind('load', function() {
+        if(offset)
+             self.setPageViewOffset(cpage, offset);
+     });
+     
+     cpage.show();
+
+     if(this.currentPage == n-1)
+          this.$nextButton.attr('disabled', 'disabled');
+     else
+          this.$nextButton.removeAttr('disabled');
+
+      if(this.currentPage == 0)
+          this.$prevButton.attr('disabled', 'disabled');
+      else
+          this.$prevButton.removeAttr('disabled');
+
+      this.$pageInput.val( (this.currentPage+1) );
   },
   
   modelStateChanged: function(property, value) {
@@ -52,6 +89,150 @@ var ImageGalleryView = View.extend({
       this.parent.freeze('Zapisywanie...');
     }
   },
+
+  $currentPage: function() {
+      if(this.currentPage >= 0 && this.currentPage < this.$pages.length)
+          return $(this.$pages[this.currentPage]);
+      else
+          return undefined;
+  },    
+
+  cleanPage: function($page) {
+    $page.hide();
+    $('img', $page).unbind();
+    
+    $page.empty();
+    
+    this.setPageViewOffset($page, {x:0, y:0});
+  },
+
+  pageDragStart: function(event)
+  {      
+      this.dragStart = {x: event.clientX, y: event.clientY};
+      $(window).bind('mousemove.imagedrag', this.pageDrag.bind(this));
+      $(window).bind('mouseup.imagedrag', this.pageDragStop.bind(this));
+      
+      this.$currentPage().css('cursor', 'move');
+
+      return false;
+  },
+
+  pageDrag: function(event)
+  {
+      if(!this.dragStart) return;
+
+      var delta = {
+           x: this.dragStart.x - event.clientX,
+           y: this.dragStart.y - event.clientY };     
+
+      var offset = this.pageViewOffset( $(this.$pages[this.currentPage]) );
+      offset.x -= delta.x;
+      offset.y -= delta.y;
+      this.setPageViewOffset( $(this.$pages[this.currentPage]), offset);
+      
+      this.dragStart = {x: event.clientX, y: event.clientY };     
+      return false;
+  },
+
+  pageDragStop: function(event) {
+      this.$currentPage().css('cursor', 'auto');
+
+      this.dragStart = undefined;
+      $(window).unbind('mousemove.imagedrag');
+      $(window).unbind('mouseup.imagedrag');
+
+      return false;
+  },
+
+  pageViewOffset: function($page) {
+      var left = parseInt($page.css('left'));
+      var top = parseInt($page.css('top'));
+
+      return {x: left, y: top};
+  },
+
+  setPageViewOffset: function($page, offset) {
+      // check if the image will be actually visible
+      // and correct
+      var MARGIN = 30;
+
+      var vp_width = this.$pageListRoot.width();
+      var vp_height = this.$pageListRoot.height();
+      
+      var width = $page.outerWidth();
+      var height = $page.outerHeight();      
+
+      if( offset.x+width-MARGIN < 0 ) {
+        // console.log('too much on the left', offset.x, -width)
+        offset.x = -width+MARGIN;
+      }
+      
+      // too much on the right
+      if( offset.x > vp_width-MARGIN) {
+          offset.x = vp_width-MARGIN;
+          // console.log('too much on the right', offset.x, vp_width, width)
+      }
+
+      
+      if( offset.y+height-MARGIN < 0)
+        offset.y = -height+MARGIN;      
+
+      if( offset.y > vp_height-MARGIN)
+          offset.y = vp_height-MARGIN;               
+      
+      $page.css({left: offset.x, top: offset.y});           
+  }, 
+  
+  renderImage: function(target, source) {
+      target.html('<img src="'+source+'" />');
+      $('img', target).
+        css({
+            'user-select': 'none',
+            '-webkit-user-select': 'none',
+            '-khtml-user-select': 'none',
+            '-moz-user-select': 'none',
+        }).
+        attr('unselectable', 'on').
+        mousedown(this.pageDragStart.bind(this));
+  },
+
+  render: function() {
+      /* first unbind all */
+      
+      // this.pageListElement
+      if(this.$nextButton) this.$nextButton.unbind();
+      if(this.$prevButton) this.$prevButton.unbind();
+      if(this.$jumpButton) this.$jumpButton.unbind();
+
+      /* render */
+      this.element.html(render_template(this.template, this));
+
+      /* fetch important parts */
+      this.$pageListRoot = $('.image-gallery-page-list', this.element);
+      this.$pages = $('.image-gallery-page-container', this.$pageListRoot);
+
+      this.$nextButton = $('.image-gallery-next-button', this.element);
+      this.$prevButton = $('.image-gallery-prev-button', this.element);
+      this.$pageInput = $('.image-gallery-current-page', this.element);
+
+      /* re-bind events */
+      this.$nextButton.click( this.nextPage.bind(this) );
+      this.$prevButton.click( this.prevPage.bind(this) );
+
+      this.$pageInput.change( this.jumpToPage.bind(this) );
+  },
+
+  jumpToPage: function() {     
+        this.gotoPage(parseInt(this.$pageInput.val())-1);
+  },
+  
+  nextPage: function() {
+      this.gotoPage(this.currentPage + 1);    
+  },
+
+  prevPage: function() {
+      this.gotoPage(this.currentPage - 1);
+  },
   
   dispose: function() {
     this.model.removeObserver(this);