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jsmind.draggable.js
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jsmind.draggable.js
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/*
* Released under BSD License
* Copyright (c) 2014-2015 [email protected]
*
* Project Home:
* https://github.com/hizzgdev/jsmind/
*/
(function($w){
'use strict';
var $d = $w.document;
var __name__ = 'jsMind';
var jsMind = $w[__name__];
if(!jsMind){return;}
if(typeof jsMind.draggable != 'undefined'){return;}
var jdom = jsMind.util.dom;
var jcanvas = jsMind.util.canvas;
var clear_selection = 'getSelection' in $w ? function(){
$w.getSelection().removeAllRanges();
} : function(){
$d.selection.empty();
};
var options = {
line_width : 5,
lookup_delay : 500,
lookup_interval : 80
};
jsMind.draggable = function(jm){
this.jm = jm;
this.e_canvas = null;
this.canvas_ctx = null;
this.shadow = null;
this.shadow_w = 0;
this.shadow_h = 0;
this.active_node = null;
this.target_node = null;
this.target_direct = null;
this.client_w = 0;
this.client_h = 0;
this.offset_x = 0;
this.offset_y = 0;
this.hlookup_delay = 0;
this.hlookup_timer = 0;
this.capture = false;
this.moved = false;
};
jsMind.draggable.prototype = {
init:function(){
this._create_canvas();
this._create_shadow();
this._event_bind();
},
resize:function(){
this.jm.view.e_nodes.appendChild(this.shadow);
this.e_canvas.width=this.jm.view.size.w;
this.e_canvas.height=this.jm.view.size.h;
},
_create_canvas:function(){
var c = $d.createElement('canvas');
this.jm.view.e_panel.appendChild(c);
var ctx = c.getContext('2d');
this.e_canvas = c;
this.canvas_ctx = ctx;
},
_create_shadow:function(){
var s = $d.createElement('jmnode');
s.style.visibility = 'hidden';
s.style.zIndex = '3';
s.style.cursor = 'move';
s.style.opacity= '0.7';
this.shadow = s;
},
reset_shadow:function(el){
var s = this.shadow.style;
this.shadow.innerHTML = el.innerHTML;
s.left = el.style.left;
s.top = el.style.top;
s.width = el.style.width;
s.height = el.style.height;
s.backgroundImage = el.style.backgroundImage;
s.backgroundSize = el.style.backgroundSize;
s.transform = el.style.transform;
this.shadow_w = this.shadow.clientWidth;
this.shadow_h = this.shadow.clientHeight;
},
show_shadow:function(){
if(!this.moved){
this.shadow.style.visibility = 'visible';
}
},
hide_shadow:function(){
this.shadow.style.visibility = 'hidden';
},
clear_lines:function(){
jcanvas.clear(this.canvas_ctx, 0, 0, this.jm.view.size.w, this.jm.view.size.h);
},
_magnet_shadow:function(node){
if(!!node){
this.canvas_ctx.lineWidth = options.line_width;
this.canvas_ctx.strokeStyle = 'rgba(0,0,0,0.3)';
this.canvas_ctx.lineCap = 'round';
this.clear_lines();
jcanvas.lineto(this.canvas_ctx,
node.sp.x,
node.sp.y,
node.np.x,
node.np.y);
}
},
_lookup_close_node:function(){
var root = this.jm.get_root();
var root_location = root.get_location();
var root_size = root.get_size();
var root_x = root_location.x + root_size.w/2;
var sw = this.shadow_w;
var sh = this.shadow_h;
var sx = this.shadow.offsetLeft;
var sy = this.shadow.offsetTop;
var ns,nl;
var direct = (sx + sw/2)>=root_x ?
jsMind.direction.right : jsMind.direction.left;
var nodes = this.jm.mind.nodes;
var node = null;
var min_distance = Number.MAX_VALUE;
var distance = 0;
var closest_node = null;
var closest_p = null;
var shadow_p = null;
for(var nodeid in nodes){
var np,sp;
node = nodes[nodeid];
if(node.isroot || node.direction == direct){
if(node.id == this.active_node.id){
continue;
}
ns = node.get_size();
nl = node.get_location();
if(direct == jsMind.direction.right){
if(sx-nl.x-ns.w<=0){continue;}
distance = Math.abs(sx-nl.x-ns.w) + Math.abs(sy+sh/2-nl.y-ns.h/2);
np = {x:nl.x+ns.w-options.line_width,y:nl.y+ns.h/2};
sp = {x:sx+options.line_width,y:sy+sh/2};
}else{
if(nl.x-sx-sw<=0){continue;}
distance = Math.abs(sx+sw-nl.x) + Math.abs(sy+sh/2-nl.y-ns.h/2);
np = {x:nl.x+options.line_width,y:nl.y+ns.h/2};
sp = {x:sx+sw-options.line_width,y:sy+sh/2};
}
if(distance < min_distance){
closest_node = node;
closest_p = np;
shadow_p = sp;
min_distance = distance;
}
}
}
var result_node = null;
if(!!closest_node){
result_node = {
node:closest_node,
direction:direct,
sp:shadow_p,
np:closest_p
};
}
return result_node;
},
lookup_close_node:function(){
var node_data = this._lookup_close_node();
if(!!node_data){
this._magnet_shadow(node_data);
this.target_node = node_data.node;
this.target_direct = node_data.direction;
}
},
_event_bind:function(){
var jd = this;
var container = this.jm.view.container;
jdom.add_event(container,'mousedown',function(e){
var evt = e || event;
jd.dragstart.call(jd,evt);
});
jdom.add_event(container,'mousemove',function(e){
var evt = e || event;
jd.drag.call(jd,evt);
});
jdom.add_event(container,'mouseup',function(e){
var evt = e || event;
jd.dragend.call(jd,evt);
});
jdom.add_event(container,'touchstart',function(e){
var evt = e || event;
jd.dragstart.call(jd,evt);
});
jdom.add_event(container,'touchmove',function(e){
var evt = e || event;
jd.drag.call(jd,evt);
});
jdom.add_event(container,'touchend',function(e){
var evt = e || event;
jd.dragend.call(jd,evt);
});
},
dragstart:function(e){
if(!this.jm.get_editable()){return;}
if(this.capture){return;}
this.active_node = null;
var jview = this.jm.view;
var el = e.target || event.srcElement;
if(el.tagName.toLowerCase() != 'jmnode'){return;}
var nodeid = jview.get_binded_nodeid(el);
if(!!nodeid){
var node = this.jm.get_node(nodeid);
if(!node.isroot){
this.reset_shadow(el);
this.active_node = node;
this.offset_x = (e.clientX || e.touches[0].clientX) - el.offsetLeft;
this.offset_y = (e.clientY || e.touches[0].clientY) - el.offsetTop;
this.client_hw = Math.floor(el.clientWidth/2);
this.client_hh = Math.floor(el.clientHeight/2);
if(this.hlookup_delay != 0){
$w.clearTimeout(this.hlookup_delay);
}
if(this.hlookup_timer != 0){
$w.clearInterval(this.hlookup_timer);
}
var jd = this;
this.hlookup_delay = $w.setTimeout(function(){
jd.hlookup_delay = 0;
jd.hlookup_timer = $w.setInterval(function(){
jd.lookup_close_node.call(jd);
},options.lookup_interval);
},options.lookup_delay);
this.capture = true;
}
}
},
drag:function(e){
if(!this.jm.get_editable()){return;}
if(this.capture){
e.preventDefault();
this.show_shadow();
this.moved = true;
clear_selection();
var px = (e.clientX || e.touches[0].clientX) - this.offset_x;
var py = (e.clientY || e.touches[0].clientY) - this.offset_y;
var cx = px + this.client_hw;
var cy = py + this.client_hh;
this.shadow.style.left = px + 'px';
this.shadow.style.top = py + 'px';
clear_selection();
}
},
dragend:function(e){
if(!this.jm.get_editable()){return;}
if(this.capture){
if(this.hlookup_delay != 0){
$w.clearTimeout(this.hlookup_delay);
this.hlookup_delay = 0;
this.clear_lines();
}
if(this.hlookup_timer != 0){
$w.clearInterval(this.hlookup_timer);
this.hlookup_timer = 0;
this.clear_lines();
}
if(this.moved){
var src_node = this.active_node;
var target_node = this.target_node;
var target_direct = this.target_direct;
this.move_node(src_node,target_node,target_direct);
}
this.hide_shadow();
}
this.moved = false;
this.capture = false;
},
move_node:function(src_node,target_node,target_direct){
var shadow_h = this.shadow.offsetTop;
if(!!target_node && !!src_node && !jsMind.node.inherited(src_node, target_node)){
// lookup before_node
var sibling_nodes = target_node.children;
var sc = sibling_nodes.length;
var node = null;
var delta_y = Number.MAX_VALUE;
var node_before = null;
var beforeid = '_last_';
while(sc--){
node = sibling_nodes[sc];
if(node.direction == target_direct && node.id != src_node.id){
var dy = node.get_location().y - shadow_h;
if(dy > 0 && dy < delta_y){
delta_y = dy;
node_before = node;
beforeid = '_first_';
}
}
}
if(!!node_before){beforeid = node_before.id;}
this.jm.move_node(src_node.id, beforeid, target_node.id, target_direct);
}
this.active_node = null;
this.target_node = null;
this.target_direct = null;
},
jm_event_handle:function(type,data){
if(type === jsMind.event_type.resize){
this.resize();
}
}
};
var draggable_plugin = new jsMind.plugin('draggable',function(jm){
var jd = new jsMind.draggable(jm);
jd.init();
jm.add_event_listener(function(type,data){
jd.jm_event_handle.call(jd,type,data);
});
});
jsMind.register_plugin(draggable_plugin);
})(window);