buffer everything - this prevents flickering on xterm and may improve terminal rendering speed.

lib/widget.js

@@ -305,6 +305,7 @@ function Screen(options) {
   this.grabKeys = false;
   this.lockKeys = false;
   this.focused;
+  this._buf = '';
 
   this._ci = -1;
 
@@ -627,20 +628,17 @@ Screen.prototype.blankLine = function(ch, dirty) {
 };
 
 Screen.prototype.insertLine = function(n, y, top, bottom) {
+  // if (y === top) return this.insertLineNC(n, y, top, bottom);
+
   if (!this.tput
       || !this.tput.strings.change_scroll_region
       || !this.tput.strings.delete_line
       || !this.tput.strings.insert_line) return;
 
-  this.program.sc();
-  this.program.csr(top, bottom);
-  this.program.cup(y, 0);
-  //if (y === top && n === 1) {
-  //  this.program.ri(); // su
-  //} else {
-  this.program.il(n);
-  this.program.csr(0, this.height - 1);
-  this.program.rc();
+  this._buf += this.tput.csr(top, bottom);
+  this._buf += this.tput.cup(y, 0);
+  this._buf += this.tput.il(n);
+  this._buf += this.tput.csr(0, this.height - 1);
 
   var j = bottom + 1;
 
@@ -653,21 +651,17 @@ Screen.prototype.insertLine = function(n, y, top, bottom) {
 };
 
 Screen.prototype.deleteLine = function(n, y, top, bottom) {
+  // if (y === top) return this.deleteLineNC(n, y, top, bottom);
+
   if (!this.tput
       || !this.tput.strings.change_scroll_region
       || !this.tput.strings.delete_line
       || !this.tput.strings.insert_line) return;
 
-  this.program.sc();
-  this.program.csr(top, bottom);
-  //if (y === top && n === 1) {
-  //  this.program.cup(bottom, 0);
-  //  this.program.ind(); // sd
-  //} else {
-  this.program.cup(y, 0);
-  this.program.dl(n);
-  this.program.csr(0, this.height - 1);
-  this.program.rc();
+  this._buf += this.tput.csr(top, bottom);
+  this._buf += this.tput.cup(y, 0);
+  this._buf += this.tput.dl(n);
+  this._buf += this.tput.csr(0, this.height - 1);
 
   var j = bottom + 1;
 
@@ -688,15 +682,10 @@ Screen.prototype.insertLineNC = function(n, y, top, bottom) {
       || !this.tput.strings.delete_line
       || !this.tput.strings.insert_line) return;
 
-  if (y !== top) return this.insertLine.apply(this, arguments);
-
-  this.program.sc();
-  this.program.csr(top, bottom);
-  this.program.cup(top, 0);
-  this.program.dl(n);
-  this.program.csr(0, this.height - 1);
-  // this.program.cup(top, 0);
-  this.program.rc();
+  this._buf += this.tput.csr(top, bottom);
+  this._buf += this.tput.cup(top, 0);
+  this._buf += this.tput.dl(n);
+  this._buf += this.tput.csr(0, this.height - 1);
 
   var j = bottom + 1;
 
@@ -717,15 +706,10 @@ Screen.prototype.deleteLineNC = function(n, y, top, bottom) {
       || !this.tput.strings.delete_line
       || !this.tput.strings.insert_line) return;
 
-  if (y !== bottom) return this.deleteLine.apply(this, arguments);
-
-  this.program.sc();
-  this.program.csr(top, bottom);
-  this.program.cup(bottom, 0);
-  this.program.write(Array(n + 1).join('\n'));
-  this.program.csr(0, this.height - 1);
-  // this.program.cup(bottom - 1, 0);
-  this.program.rc();
+  this._buf += this.tput.csr(top, bottom);
+  this._buf += this.tput.cup(bottom, 0);
+  this._buf += Array(n + 1).join('\n');
+  this._buf += this.tput.csr(0, this.height - 1);
 
   var j = bottom + 1;
 
@@ -830,6 +814,8 @@ Screen.prototype.draw = function(start, end) {
     , bg
     , flags;
 
+  var main = '';
+
   var clr
     , neq
     , xx;
@@ -840,14 +826,10 @@ Screen.prototype.draw = function(start, end) {
 
   var acs;
 
-  // var cx = this.program.x
-  //   , cy = this.program.y
-  //   , ch = this.program.cursorHidden;
-  //
-  // if (!ch) this.program.hideCursor();
-
-  // this.program.sc('draw');
-  this.program.sc();
+  if (this._buf) {
+    main += this._buf;
+    this._buf = '';
+  }
 
   for (y = start; y <= end; y++) {
     line = this.lines[y];
@@ -1097,18 +1079,35 @@ Screen.prototype.draw = function(start, end) {
       out += '\x1b[m';
     }
 
-    if (this.tput) {
-      if (out) this.program.write(this.tput.cup(y, 0) + out);
-    } else {
-      if (out) this.program.write('\x1b[' + (y + 1) + ';1H' + out);
+    if (out) {
+      main += this.tput
+        ? this.tput.cup(y, 0) + out
+        : '\x1b[' + (y + 1) + ';1H' + out;
     }
   }
 
-  // this.program.cup(cy, cx);
-  // if (ch) this.program.hideCursor();
+  if (main) {
+    var pre = ''
+      , post = '';
 
-  // this.program.rc('draw', true);
-  this.program.rc();
+    pre += this.tput
+      ? this.tput.sc()
+      : '\x1b7';
+    post += this.tput
+      ? this.tput.rc()
+      : '\x1b8';
+
+    if (!this.program.cursorHidden) {
+      pre += this.tput
+        ? this.tput.civis()
+        : '\x1b[?25l';
+      post += this.tput
+        ? this.tput.cnorm()
+        : '\x1b[?25h';
+    }
+
+    this.program.write(pre + main + post);
+  }
 };
 
 Screen.prototype._reduceColor = function(col) {

test/widget-file.js

@@ -2,7 +2,8 @@ var blessed = require('../');
 
 var screen = blessed.screen({
   tput: true,
-  smartCSR: true
+  smartCSR: true,
+  dump: __dirname + '/file.log'
 });
 
 var fm = blessed.filemanager({