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optimize longest line calculation

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This commit is contained in:
Fabian Jakobs 2010-04-07 16:27:02 +02:00
commit 9315c374e6
2 changed files with 44 additions and 26 deletions
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52
TextDocument.js
View file

@ -1,5 +1,7 @@
function TextDocument(text) {
function TextDocument(text)
{
this.lines = this._split(text);
this.modified = true;
}
TextDocument.prototype =
@ -8,6 +10,22 @@ TextDocument.prototype =
return text.split(/[\n\r]/)
},
getWidth : function()
{
if (this.modified)
{
this.modified = false;
var lines = this.lines;
var longestLine = 0;
for (var i=0; i < lines.length; i++) {
longestLine = Math.max(longestLine, lines[i].length);
}
this.width = longestLine;
}
return this.width;
},
getLine : function(row) {
return this.lines[row] || "";
},
@ -72,8 +90,24 @@ TextDocument.prototype =
return this.lines.length;
},
getTextRange : function(range)
{
if (range.start.row == range.end.row) {
return this.lines[range.start.row].substring(range.start.column, range.end.column);
} else {
var lines = [];
lines.push(this.lines[range.start.row].substring(range.start.column));
lines.push.apply(lines, this.lines.slice(range.start.row+1, range.end.row+1));
lines.push(this.lines[range.end.row].substring(0, range.end.column));
return lines.join("\n");
}
},
insert : function(position, text)
{
this.modified = true;
var newLines = this._split(text);
if (text == "\n")
@ -117,23 +151,11 @@ TextDocument.prototype =
};
}
},
getTextRange : function(range)
{
if (range.start.row == range.end.row) {
return this.lines[range.start.row].substring(range.start.column, range.end.column);
} else {
var lines = [];
lines.push(this.lines[range.start.row].substring(range.start.column));
lines.push.apply(lines, this.lines.slice(range.start.row+1, range.end.row+1));
lines.push(this.lines[range.end.row].substring(0, range.end.column));
return lines.join("\n");
}
},
remove : function(range)
{
this.modified = true;
var firstRow = range.start.row;
var lastRow = range.end.row;

18
VirtualRenderer.js
View file

@ -25,6 +25,7 @@ function VirtualRenderer(containerId)
VirtualRenderer.prototype.setDocument = function(doc)
{
this.lines = doc.lines;
this.doc = doc;
this.textLayer.setDocument(doc);
};
@ -32,23 +33,18 @@ VirtualRenderer.prototype.getContainerElement = function() {
return this.container;
};
VirtualRenderer.prototype.getLongestLineWidth = function(lines)
{
var longestLine = this.container.clientWidth;
for (var i=0; i < lines.length; i++) {
longestLine = Math.max(longestLine, (lines[i].length * this.characterWidth));
}
return longestLine;
};
VirtualRenderer.prototype.draw = function()
{
var lines = this.lines;
var offset = this.scrollTop % this.lineHeight;
var minHeight = this.container.clientHeight + offset;
var minHeight = this.scroller.clientHeight + offset;
var longestLine = Math.max(
this.scroller.clientWidth,
this.doc.getWidth() * this.characterWidth
);
var longestLine = this.getLongestLineWidth(lines);
var lineCount = Math.ceil(minHeight / this.lineHeight);
var firstRow = Math.round((this.scrollTop - offset) / this.lineHeight);
var lastRow = Math.min(lines.length, firstRow+lineCount);