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Continuing fairexpand #6663

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1. Expanding divs to improve text selection. (Yury)
2. Adding enhanceTextSelection as an option.
3. Moving feature functionality from text_layer_builder.js to text_layer.js.
4. Added expandTextDivs method to only load expanded divs on first click, and only show on subsequent clicks
This commit is contained in:
Jeremy Press 2016-08-16 16:06:35 -07:00
parent 31cd23a6df
commit 6faa84abdb
8 changed files with 433 additions and 36 deletions
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30
web/text_layer_builder.js
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@ -35,6 +35,8 @@
* @property {number} pageIndex - The page index.
* @property {PageViewport} viewport - The viewport of the text layer.
* @property {PDFFindController} findController
* @property {boolean} enhanceTextSelection - Option to turn on improved
* text selection.
*/
/**
@ -57,6 +59,7 @@ var TextLayerBuilder = (function TextLayerBuilderClosure() {
this.textDivs = [];
this.findController = options.findController || null;
this.textLayerRenderTask = null;
this.enhanceTextSelection = options.enhanceTextSelection;
this._bindMouse();
}
@ -64,9 +67,11 @@ var TextLayerBuilder = (function TextLayerBuilderClosure() {
_finishRendering: function TextLayerBuilder_finishRendering() {
this.renderingDone = true;
var endOfContent = document.createElement('div');
endOfContent.className = 'endOfContent';
this.textLayerDiv.appendChild(endOfContent);
if (!this.enhanceTextSelection) {
var endOfContent = document.createElement('div');
endOfContent.className = 'endOfContent';
this.textLayerDiv.appendChild(endOfContent);
}
this.eventBus.dispatch('textlayerrendered', {
source: this,
@ -96,7 +101,8 @@ var TextLayerBuilder = (function TextLayerBuilderClosure() {
container: textLayerFrag,
viewport: this.viewport,
textDivs: this.textDivs,
timeout: timeout
timeout: timeout,
enhanceTextSelection: this.enhanceTextSelection,
});
this.textLayerRenderTask.promise.then(function () {
this.textLayerDiv.appendChild(textLayerFrag);
@ -314,7 +320,12 @@ var TextLayerBuilder = (function TextLayerBuilderClosure() {
*/
_bindMouse: function TextLayerBuilder_bindMouse() {
var div = this.textLayerDiv;
var self = this;
div.addEventListener('mousedown', function (e) {
if (self.enhanceTextSelection && self.textLayerRenderTask) {
self.textLayerRenderTask.expandTextDivs(true);
return;
}
var end = div.querySelector('.endOfContent');
if (!end) {
return;
@ -338,6 +349,10 @@ var TextLayerBuilder = (function TextLayerBuilderClosure() {
end.classList.add('active');
});
div.addEventListener('mouseup', function (e) {
if (self.enhanceTextSelection && self.textLayerRenderTask) {
self.textLayerRenderTask.expandTextDivs(false);
return;
}
var end = div.querySelector('.endOfContent');
if (!end) {
return;
@ -362,13 +377,16 @@ DefaultTextLayerFactory.prototype = {
* @param {HTMLDivElement} textLayerDiv
* @param {number} pageIndex
* @param {PageViewport} viewport
* @param {boolean} enhanceTextSelection
* @returns {TextLayerBuilder}
*/
createTextLayerBuilder: function (textLayerDiv, pageIndex, viewport) {
createTextLayerBuilder: function (textLayerDiv, pageIndex, viewport,
enhanceTextSelection) {
return new TextLayerBuilder({
textLayerDiv: textLayerDiv,
pageIndex: pageIndex,
viewport: viewport
viewport: viewport,
enhanceTextSelection: enhanceTextSelection
});
}
};