draggable-element-controllet.html
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<!--
@license
The MIT License (MIT)
Copyright (c) 2015 Dipartimento di Informatica - Università di Salerno - Italy
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-->
<!--
* Developed by :
* ROUTE-TO-PA Project - grant No 645860. - www.routetopa.eu
*
-->
<link rel="import" href="../../bower_components/polymer/polymer.html">
<link rel="import" href="../../bower_components/paper-styles/color.html">
<link rel="import" href="../../bower_components/paper-material/paper-material.html">
<link rel="import" href="../../bower_components/paper-fab/paper-fab.html">
<!--
`draggable-element-controllet` is a controllet that represents a draggable element. It can be a target or source. When it's a suorce is possible to drag the content in to a
container( a draggable-element-controllet with target feature active). When it's a target it manage the drag-and event to get the the text and id value of the source content.
During the dragging phase all the target border will be emphasize to facilitate the drop phase.
Example:
SOURCE
<draggable-element-controllet
identifier="MyId"
label="MyLablel">
</draggable-element-controllet>
TARGET
<draggable-element-controllet
is-target="true"
heading="MyHeading"
description="MyDescription"
number="MyIndex">
</draggable-element-controllet>
@element draggable-element-controllet
@status beta
@homepage
@group controllets
-->
<dom-module id="draggable-element-controllet">
<template>
<style is="custom-style">
:host{
font-size: 0.84em;
}
.drag-content-target{
margin-bottom: 6em;
width: 13.5em;
font-weight: bolder;
}
.drag-content-source{
height: 1.5em;
width: 12.5em;
}
.draggable-card-source{
position: relative;
float: left;
margin : 0.625em;
height: 1.5em;
width: 13.5em;
border-width : 0.0625em;
background-color: #e8e8e8;;
padding: 1em;
overflow: hidden;
}
.draggable-card-target{
position: relative;
float: left;
margin : 0.625em;
height: 1.5em;
width: 13.5em;
border-width : 0.0625em;
background-color: #2196f3;;
color: #ffffff;
padding: 1em;
overflow: hidden;
}
.avatar {
display: inline-block;
position: relative;
float: left;
height: 2em;
width: 2em;
border-radius: 50%;
background: var(--paper-blue-500);
color: white;
line-height: 2em;
font-size: 0.9375em;
text-align: center;
}
.heading{
/*width: 12.5em;*/
}
.big {
display: inline-block;
position: relative;
float: left;
font-size: 1em;
padding: 0.5em 0.25em 0.5em;
color: var(--google-grey-500);
}
.medium {
font-size: 0.8125em;
padding-bottom: 0px;
display: inline-block;
/*width: 12.5em;*/
}
.unselectable {
-webkit-touch-callout: none;
-webkit-user-select: none;
-khtml-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
#delete{
position: relative;
top: 24px;
left: 200px;
width: 24px;
height: 24px;
z-index: 1;
--iron-icon-height: 18px;
--iron-icon-width: 18px;
--paper-fab-background:#cccccc;
}
</style>
<template is="dom-if" if="{{isTarget}}">
<div class="drag-content-target" draggable="false">
<div class="card-content">
<div class="heading">
<div class="avatar">{{number}}</div>
<div class="big">{{heading}}</div><br>
</div>
<div class="medium">{{description}}</div>
</div>
<paper-fab id="delete" mini icon="clear" on-click="_handleDeleteClick"></paper-fab>
<paper-material elevation="2" id="target_dragged_identifier" class='draggable-card-target dd-content-target unselectable'>{{label}}</paper-material>
</div>
</template>
<template is="dom-if" if="{{!isTarget}}">
<div id="source" class="drag-content-source" draggable="true" ondragstart="event.dataTransfer.setData('text/plain', 'This text may be dragged')" on-track="_handleTrack" on-drag="_handleOnDrag" on-dragstart="_handleStartDrag" on-dragenter="_handleEnterDrag">
<paper-material elevation="2" id="{{identifier}}" class='draggable-card-source unselectable'>{{label}}</paper-material>
</div>
</template>
</template>
<script>
Polymer({
is: 'draggable-element-controllet',
/**
* Fired when the user drags a suorce in to a target element.
*
* @event draggable-element-controllet_content-dragged
*/
targets : null,
properties: {
/**
* It's a boolean flag to give to the controllet the role of target.
*
* @attribute isTarget
* @type Boolean
* @default false
*/
isTarget : {
type : Boolean,
value: false
},
/**
* It's a string value the represent the current number of target. It will be use in the label section.
*
* @attribute number
* @type Strig
* @default '0'
*/
number: {
type: String,
value : "1"
},
/**
* It's the name of the target field
*
* @attribute heading
* @type Strig
* @default 'Heading'
*/
heading : {
type : String,
value : "Heading"
},
/**
* It's the description of the target field
*
* @attribute description
* @type Strig
* @default 'Description'
*/
description: {
type: String,
value: "Description"
},
/**
* It's the value of the source field
*
* @attribute label
* @type Strig
* @default 'Label'
*/
label : {
type : String,
value : undefined
},
/**
* It's the identifier associated to the source field element
*
* @attribute identifier
* @type Strig
* @default ''
*/
identifier : {
type : String,
value : ""
},
value : {
type : String,
value : ""
}
},
ready : function(){
},
_handleStartDrag : function(e){
/*var target = EventUtil.getCurrentTarget(e);
target.style.cursor = 'move';*/
return true;
},
_handleEnterDrag : function(e){
/*var target = e.target;
if(target.draggable == false && (target.className.indexOf("dd-content-target") != -1)){
target.parentNode.parentNode.value = e.srcElement.id;
target.innerHTML = e.srcElement.innerText;
this.fire('draggable-element-controllet_content-dragged', {target: target, source: e.srcElement});
}
for (var i = 0; i < this.targets.length; i++) {
this.targets[i].children[0].children[1].className = "draggable-card dd-content-target unselectable style-scope draggable-element-controllet";
}*/
return false;
},
/**
* Callback associated to event on-drag for the source element. When the user is dragging a source element all the target border will be emphasized.
*
* @method _handleOnDrag
*
* @param {Event} e
*/
_handleOnDrag : function(e){
this.targets = document.querySelectorAll('draggable-element-controllet[is-target=true]');
for (var i = 0; i < this.targets.length; i++) {
this.targets[i].children[0].children[2].elevation = "5";
}
},
/**
* Callback associated to event on-trak for the source element. When the user stops dragging a source element the relative target is recognized and an event will be
* fired to broadcast to all listeners the information about the current dragging operation.
*
* @method _handleTrack
*
* @param {Event} e
*/
_handleTrack : function(e) {
switch(e.detail.state) {
case 'start':
break;
case 'track':
break;
case 'end':
var target = e.detail.hover();
if(target.draggable == false && (target.className.indexOf("dd-content-target") != -1)){
target.parentNode.parentNode.value = e.target.id;
target.innerHTML = e.target.innerHTML;
this.fire('draggable-element-controllet_content-dragged', {target: target, source: e.target});
}
for (var i = 0; i < this.targets.length; i++) {
this.targets[i].children[0].children[2].elevation = "2";
}
break;
}
},
/**
* Manage the delete operation of the content.
*
* @param e
* @private
*/
_handleDeleteClick: function(e){
this.value = "";
e.currentTarget.nextElementSibling.innerHTML = "";
this.fire('draggable-element-controllet_content-dragged', {target: e.target, source: e.target});
}
});
</script>
</dom-module>