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simplify adding of textdivs to DOM as queue is no longer needed

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This commit is contained in:
Adil Allawi 2011-12-16 10:38:30 +00:00
parent 5bd080fd05
commit b921486bce
1 changed files with 15 additions and 37 deletions
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52
src/canvas.js
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@ -257,9 +257,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
this.ctx.scale(cw / mediaBox.width, ch / mediaBox.height);
this.textDivs = [];
this.textLayerQueue = [];
// Prevent textLayerQueue from being rendered while rendering a new page
if (this.textLayerTimer)
clearInterval(this.textLayerTimer);
},
executeIRQueue: function canvasGraphicsExecuteIRQueue(codeIR,
@ -328,41 +325,22 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
return;
var self = this;
var textDivIndex = 0;
var renderTextLayer = function canvasRenderTextLayer() {
var finished = false;
var textDivs = self.textDivs;
if (textDivIndex < textDivs.length) {
var textDiv = textDivs[textDivIndex++];
if (textDiv.dataset.textLength > 1) { // avoid div by zero
textLayer.appendChild(textDiv);
// Adjust div width (via letterSpacing) to match canvas text
// Due to the .offsetWidth calls, this is slow
textDiv.style.letterSpacing =
((textDiv.dataset.canvasWidth - textDiv.offsetWidth) /
(textDiv.dataset.textLength - 1)) + 'px';
}
}
else
finished = true;
return finished;
}
var textLayerQueue = this.textLayerQueue;
textLayerQueue.push(renderTextLayer);
// Lazy textLayer rendering (to prevent UI hangs)
// Only render queue if activity has stopped, where "no activity" ==
// "no beginDrawing() calls in the last N ms"
this.textLayerTimer = setInterval(function renderTextLayerQueue() {
// Render most recent (==most relevant) layers first
for (var i = textLayerQueue.length - 1; i >= 0; i--) {
var finished = textLayerQueue[i].call();
if (finished)
textLayerQueue.splice(i, 1);
}
if (textLayerQueue.length == 0)
var textDivs = this.textDivs;
this.textLayerTimer = setInterval(function renderTextLayer() {
if (textDivs.length === 0) {
clearInterval(self.textLayerTimer);
}, 1);
return;
}
var textDiv = textDivs.shift();
if (textDiv.dataset.textLength > 1) { // avoid div by zero
textLayer.appendChild(textDiv);
// Adjust div width (via letterSpacing) to match canvas text
// Due to the .offsetWidth calls, this is slow
textDiv.style.letterSpacing =
((textDiv.dataset.canvasWidth - textDiv.offsetWidth) /
(textDiv.dataset.textLength - 1)) + 'px';
}
}, 0);
},
// Graphics state