签字板应用是通过创建自定义控件实现的，相关代码如下：
1.HTML
<!DOCTYPE HTML>
<html>
<head> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <script id="sap-ui-bootstrap"
type="text/javascript"
data-sap-ui-libs="sap.m"
data-sap-ui-theme="sap_bluecrystal"
src="https://sapui5.hana.ondemand.com/resources/sap-ui-core.js"></script> </head>
<body class="sapUiBody">
<div id="content"></div>
</body>
2.Javascript
jQuery(function() {
sap.ui.core.Control.extend('SignaturePad', {
metadata: {
properties: {
width: {type: 'int', defaultValue: 300},
height: {type: 'int', defaultValue: 100},
bgcolor: {type: 'string', defaultValue: '#ffa'},
lineColor: {type: 'string', defaultValue: '#666'},
penColor: {type: 'string', defaultValue: '#333'},
signature: 'string'
}
},
renderer: function(oRm, oControl) {
var bgColor = oControl.getBgcolor();
var lineColor = oControl.getLineColor();
var pen = oControl.getPenColor();
var id = oControl.getId();
var w = oControl.getWidth();
var h = oControl.getHeight();
oRm.write("<div");
oRm.writeControlData(oControl);
oRm.write(">");
oRm.write('<svg xmlns="http://www.w3.org/2000/svg" width="' + w +
'" height="' + h + '" viewBox="0 0 ' + w + ' ' + h + '">');
oRm.write('<rect id="' + id + '_r" width="' + w + '" height="' + h +
'" fill="' + bgColor + '"/>');
var hh = h - 20;
oRm.write('<line x1="0" y1="' + hh + '" x2="' + w + '" y2="' + hh +
'" stroke="' + lineColor +
'" stroke-width="1" stroke-dasharray="3" ' +
'shape-rendering="crispEdges" pointer-events="none"/>');
oRm.write('<path id="' + id + '_p" stroke="' + pen + '" stroke-width="2" ' +
'fill="none" pointer-events="none"/>');
oRm.write('</svg>');
oRm.write("</div>");
},
clear: function() {
this.signaturePath = '';
var p = document.getElementById(this.getId() + '_p');
p.setAttribute('d', '');
},
onAfterRendering: function() {
var that = this;
this.signaturePath ='';
isDown = false;
var elm = this.$()[0];
var r = document.getElementById(this.getId() + '_r');
var p = document.getElementById(this.getId() + '_p');
function isTouchEvent(e) {
return e.type.match(/^touch/);
}
function getCoords(e) {
if (isTouchEvent(e)) {
return e.targetTouches[0].clientX + ',' +
e.targetTouches[0].clientY;
}
return e.clientX + ',' + e.clientY;
}
function down(e) {
that.signaturePath += 'M' + getCoords(e) + ' ';
p.setAttribute('d', that.signaturePath);
isDown = true;
if (isTouchEvent(e)) e.preventDefault();
}
function move(e) {
if (isDown) {
that.signaturePath += 'L' + getCoords(e) + ' ';
p.setAttribute('d', that.signaturePath);
}
if (isTouchEvent(e)) e.preventDefault();
}
function up(e) {
isDown = false;
if (isTouchEvent(e)) e.preventDefault();
}
r.addEventListener('mousedown', down, false);
r.addEventListener('mousemove', move, false);
r.addEventListener('mouseup', up, false);
r.addEventListener('touchstart', down, false);
r.addEventListener('touchmove', move, false);
r.addEventListener('touchend', up, false);
r.addEventListener('mouseout', up, false);
if (this.getSignature()) {
console.log('asdasda');
this.signaturePath = this.getSignature();
var p = document.getElementById(this.getId() + '_p');
if (p) {
p.setAttribute('d', this.signaturePath);
}
}
this.setSignature = function(s) {
this.setProperty('signature', s);
this.invalidate();
}
}
});
var oCtrl = new SignaturePad();
oCtrl.placeAt('content');
(new sap.m.Button({
text: 'Clear',
press: function() {
prevSignature = oCtrl.getSignature();
if (prevSignature) {
undo.setEnabled(true);
}
oCtrl.clear();
}
})).placeAt('content');
(new sap.m.Button({
text: 'Accept',
press: function() {
sap.m.MessageToast.show(oCtrl.getSignature());
}
})).placeAt('content');
var prevSignature = null;
var undo = new sap.m.Button({
text: 'Undo',
enabled: false,
press: function() {
oCtrl.setSignature(prevSignature);
}
});
undo.placeAt('content');
oCtrl.setSignature('M48,46 L47,46 L43,46 L42,46 L40,46 L39,46 L38,46 L37,46 L36,46 L36,47 L35,47 L35,48 L35,49 L35,51 L37,51 L38,51 L39,53 L40,54 L42,55 L43,57 L44,57 L44,59 L44,60 L44,61 L43,61 L41,61 L37,61 L34,61 L31,61 L29,61 L28,61 L27,61 L28,61 M49,47 L49,48 L49,49 L49,51 L49,52 L49,54 L49,55 L50,56 L50,58 L50,57 L50,55 L50,54 L50,53 L50,51 L52,51 L52,51 L52,49 L52,48 L53,48 L53,47 L54,47 L54,47 L55,47 L56,47 L57,49 L58,50 L60,51 L60,53 L62,54 L62,55 L63,56 L63,57 L63,58 L63,59 L63,61 L64,61 L64,61 L64,62 M56,57 L57,56 L60,56 L62,55 L63,55 L64,54 L65,54 M69,47 L69,48 L69,49 L69,51 L69,54 L69,55 L69,57 L69,58 L69,60 L69,60 L69,61 M67,45 L67,44 L68,43 L68,43 L71,41 L73,41 L76,41 L77,40 L78,40 L79,40 L80,41 L80,41 L80,42 L80,43 L80,44 L80,44 L80,45 L78,45 L77,46 L75,47 L74,47 L72,49 L72,49 L71,49 L69,49 L68,49 L67,49 M87,41 L87,42 L87,43 L87,44 L87,46 L87,48 L87,49 L87,51 L87,52 L88,53 L88,53 L89,53 L90,54 L91,55 L92,55 L94,55 L95,57 L96,57 L97,57 L98,56 L98,55 L98,54 L99,53 L99,52 L99,50 L99,49 L99,47 L99,46 L99,45 L99,43 L99,43 L99,42 L99,41 L99,40 M107,40 L107,41 L107,42 L107,44 L107,46 L107,49 L107,50 L107,52 L107,52 M121,36 L121,37 L121,38 L121,39 L120,42 L120,43 L120,45 L120,46 L120,47 L120,48 L120,48 L120,47 L122,47 L122,47 L122,45 L124,45 L125,44 L127,44 L130,44 L133,44 L136,45 L139,46 L141,46 L141,47 L141,47 L141,48 L141,50 L139,51 L138,52 L136,53 L133,55 L129,56 L126,56 L123,57 L120,57 L119,57 L117,57 L117,56 M122,38 L122,37 L123,37 L125,36 L130,36 L133,33 L138,32 L142,30 L145,28 L147,28');
});3.测试