add button.value. add simple form example.

example/simple-form.js

@@ -0,0 +1,87 @@
+var blessed = require('blessed')
+  , screen = blessed.screen();
+
+var form = blessed.form({
+  parent: screen,
+  keys: true,
+  left: 0,
+  top: 0,
+  width: 30,
+  height: 4,
+  bg: 'green',
+  content: 'Submit or cancel?'
+});
+
+var submit = blessed.button({
+  parent: form,
+  mouse: true,
+  keys: true,
+  shrink: true,
+  padding: {
+    left: 1,
+    right: 1
+  },
+  left: 10,
+  top: 2,
+  shrink: true,
+  name: 'submit',
+  content: 'submit',
+  style: {
+    bg: 'blue',
+    focus: {
+      bg: 'red'
+    },
+    hover: {
+      bg: 'red'
+    }
+  }
+});
+
+var cancel = blessed.button({
+  parent: form,
+  mouse: true,
+  keys: true,
+  shrink: true,
+  padding: {
+    left: 1,
+    right: 1
+  },
+  left: 20,
+  top: 2,
+  shrink: true,
+  name: 'cancel',
+  content: 'cancel',
+  style: {
+    bg: 'blue',
+    focus: {
+      bg: 'red'
+    },
+    hover: {
+      bg: 'red'
+    }
+  }
+});
+
+submit.on('press', function() {
+  form.submit();
+});
+
+cancel.on('press', function() {
+  form.reset();
+});
+
+form.on('submit', function(data) {
+  form.setContent('Submitted.');
+  screen.render();
+});
+
+form.on('reset', function(data) {
+  form.setContent('Canceled.');
+  screen.render();
+});
+
+screen.key('q', function() {
+  process.exit(0);
+});
+
+screen.render();

lib/widget.js

@@ -4312,6 +4312,7 @@ Form.prototype.reset = function() {
         el.clearInput();
         return;
       case 'button':
+        delete el.value;
         break;
       case 'progress-bar':
         el.setProgress(0);
@@ -4762,8 +4763,9 @@ Button.prototype.__proto__ = Input.prototype;
 Button.prototype.type = 'button';
 
 Button.prototype.press = function() {
-  var self = this;
+  this.value = true;
   this.emit('press');
+  delete this.value;
 };
 
 /**