plugins/gallery/canvas.js
author Dan
Thu, 15 May 2008 21:09:04 -0400
changeset 26 023a21c8f47c
parent 19 08bf8aa2f0ab
child 35 1dd30d7bf29f
permissions -rw-r--r--
Added support for embedding Snapr images as wikitext code into regular pages
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var canvas_mousemove_temp;
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var canvas_keyup_temp;
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var CANVAS_KEY_ESC = 27;
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function canvas_click(obj)
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{
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  var click_x = mouseX - $(obj).Left();
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  var click_y = mouseY - $(obj).Top() + getScrollOffset();
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  if ( obj.canvas_in_draw )
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  {
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    canvas_close_draw(obj, click_x, click_y);
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  }
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  else
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  {
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    canvas_open_draw(obj, click_x, click_y);
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  }
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}
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function canvas_open_draw(obj, x, y)
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{
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  obj.canvas_box_obj = canvas_create_box(obj, x, y, 1, 1);
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  obj.canvas_in_draw = true;
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  obj.onclick = function(e)
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  {
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    canvas_click(this);
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    var onclose = this.getAttribute('canvas:oncomplete');
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    if ( onclose )
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    {
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      eval(onclose);
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    }
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  }
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  canvas_replace_mousemove(obj);
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}
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function canvas_replace_mousemove(obj)
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{
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  canvas_mousemove_temp = document.onmousemove;
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  canvas_mousemove_temp.box_obj = obj;
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  canvas_keyup_temp = document.onkeyup;
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  document.onmousemove = function(e)
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  {
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    canvas_mousemove_temp(e);
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    canvas_redraw_box(canvas_mousemove_temp.box_obj);
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  }
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  document.onkeyup = function(e)
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  {
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    if ( typeof(canvas_keyup_temp) == 'function' )
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      canvas_keyup_temp(e);
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    if ( e.keyCode == CANVAS_KEY_ESC )
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      canvas_cancel_draw(canvas_mousemove_temp.box_obj);
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  }
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}
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function canvas_restore_mousemove()
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{
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  document.onmousemove = canvas_mousemove_temp;
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  document.onkeyup = canvas_keyup_temp;
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}
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function canvas_create_box(obj, x, y, width, height)
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{
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  var inner_width = width - 2;
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  var inner_height = height - 2;
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  var top = $(obj).Top() + y;
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  var left = $(obj).Left() + x;
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  // draw outer box
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  var div_outer = document.createElement('div');
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  div_outer.className = 'canvasbox';
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  div_outer.style.border = '1px solid #000000';
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  div_outer.style.position = 'absolute';
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  div_outer.style.width = String(width) + 'px';
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  div_outer.style.height = String(height) + 'px';
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  div_outer.style.top = String(top) + 'px';
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  div_outer.style.left = String(left) + 'px';
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  div_outer.rootY = y;
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  div_outer.rootX = x;
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  var div_inner = document.createElement('div');
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  div_inner.style.border = '1px solid #FFFFFF';
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  if ( IE )
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  {
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    div_inner.style.width = '100%';
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    div_inner.style.height = '100%';
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  }
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  else
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  {
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    div_inner.style.width = String(inner_width) + 'px';
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    div_inner.style.height = String(inner_height) + 'px';
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  }
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  div_outer.appendChild(div_inner);
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  obj.appendChild(div_outer);
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  return div_outer;
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}
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function canvas_redraw_box(obj)
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{
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  if ( !obj.canvas_box_obj )
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    return false;
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  var rel_x = mouseX - $(obj).Left();
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  var rel_y = mouseY - $(obj).Top() + getScrollOffset();
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  var new_width = rel_x - obj.canvas_box_obj.rootX;
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  var new_height = rel_y - obj.canvas_box_obj.rootY;
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  var rootX = obj.canvas_box_obj.rootX;
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  var rootY = obj.canvas_box_obj.rootY;
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  // Limit dimensions to width - origin_x and height - origin_y
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  if ( new_width + rootX > $(obj).Width() )
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    new_width = $(obj).Width() - rootX;
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  if ( new_height + rootY > $(obj).Height() )
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    new_height = $(obj).Height() - rootY;
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  // If going to the top or left of the origin, avoid negative width/height by moving the box
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  if ( new_width < 1 )
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  {
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    new_width = rootX - rel_x;
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    obj.canvas_box_obj.style.left = String(mouseX + 2) + 'px';
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  }
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  if ( new_height < 1 )
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  {
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    new_height = rootY - rel_y;
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    obj.canvas_box_obj.style.top = String(mouseY + getScrollOffset() + 2) + 'px';
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  }
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  obj.canvas_box_obj.style.width = String(new_width) + 'px';
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  obj.canvas_box_obj.style.height = String(new_height) + 'px';
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  new_width = new_width - 2;
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  new_height = new_height - 2;
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  if ( IE )
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  {
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    var nw = new_width;
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    var nh = new_height;
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    obj.canvas_box_obj.firstChild.style.width = String(nw) + 'px';
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    obj.canvas_box_obj.firstChild.style.height = String(nh) + 'px';
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  }
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  else
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  {
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    obj.canvas_box_obj.firstChild.style.width = String(new_width) + 'px';
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    obj.canvas_box_obj.firstChild.style.height = String(new_height) + 'px';
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  }
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}
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function canvas_close_draw(obj, x, y)
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{
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  canvas_restore_mousemove();
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  obj.canvas_in_draw = false;
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  obj.canvas = {
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    top: $(obj.canvas_box_obj).Top() - $(obj).Top(),
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    left: $(obj.canvas_box_obj).Left() - $(obj).Left(),
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    width: $(obj.canvas_box_obj).Width(),
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    height: $(obj.canvas_box_obj).Height()
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  }
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  obj.onclick = function(e)
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  {
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    canvas_click(this);
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  }
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}
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function canvas_cancel_draw(obj)
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{
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  canvas_restore_mousemove();
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  obj.canvas_in_draw = false;
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  obj.removeChild(obj.canvas_box_obj);
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  obj.canvas_box_obj = null;
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  obj.onclick = function(e)
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  {
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    canvas_click(this);
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  }
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  var ga = obj.getAttribute('canvas:oncancel');
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  if ( ga )
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  {
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    eval(ga);
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  }
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}
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