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Maintain the current position in the document when zooming

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Jonas Jenwald 2014-01-11 12:57:33 +01:00
parent d6ed4f2631
commit 05c331c295
3 changed files with 87 additions and 33 deletions
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55
web/presentation_mode.js
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@ -20,6 +20,7 @@
var DELAY_BEFORE_HIDING_CONTROLS = 3000; // in ms
var SELECTOR = 'presentationControls';
var DELAY_BEFORE_RESETTING_SWITCH_IN_PROGRESS = 1000; // in ms
var PresentationMode = {
active: false,
@ -66,11 +67,38 @@ var PresentationMode = {
document.msFullscreenElement);
},
/**
* Initialize a timeout that is used to reset PDFView.currentPosition when the
* browser transitions to fullscreen mode. Since resize events are triggered
* multiple times during the switch to fullscreen mode, this is necessary in
* order to prevent the page from being scrolled partially, or completely,
* out of view when Presentation Mode is enabled.
* Note: This is only an issue at certain zoom levels, e.g. 'page-width'.
*/
_setSwitchInProgress: function presentationMode_setSwitchInProgress() {
if (this.switchInProgress) {
clearTimeout(this.switchInProgress);
}
this.switchInProgress = setTimeout(function switchInProgressTimeout() {
delete this.switchInProgress;
}.bind(this), DELAY_BEFORE_RESETTING_SWITCH_IN_PROGRESS);
PDFView.currentPosition = null;
},
_resetSwitchInProgress: function presentationMode_resetSwitchInProgress() {
if (this.switchInProgress) {
clearTimeout(this.switchInProgress);
delete this.switchInProgress;
}
},
request: function presentationModeRequest() {
if (!PDFView.supportsFullscreen || this.isFullscreen ||
!this.viewer.hasChildNodes()) {
return false;
}
this._setSwitchInProgress();
if (this.container.requestFullscreen) {
this.container.requestFullscreen();
@ -94,9 +122,15 @@ var PresentationMode = {
enter: function presentationModeEnter() {
this.active = true;
this._resetSwitchInProgress();
PDFView.page = this.args.page;
PDFView.setScale('page-fit', true);
// Ensure that the correct page is scrolled into view when entering
// Presentation Mode, by waiting until fullscreen mode in enabled.
// Note: This is only necessary in non-Mozilla browsers.
setTimeout(function enterPresentationModeTimeout() {
PDFView.page = this.args.page;
PDFView.setScale('page-fit', true);
}.bind(this), 0);
window.addEventListener('mousemove', this.mouseMove, false);
window.addEventListener('mousedown', this.mouseDown, false);
@ -109,18 +143,25 @@ var PresentationMode = {
},
exit: function presentationModeExit() {
this.active = false;
var page = PDFView.page;
PDFView.setScale(this.args.previousScale);
PDFView.page = page;
// Ensure that the correct page is scrolled into view when exiting
// Presentation Mode, by waiting until fullscreen mode is disabled.
// Note: This is only necessary in non-Mozilla browsers.
setTimeout(function exitPresentationModeTimeout() {
PDFView.setScale(this.args.previousScale);
PDFView.page = page;
// Keep Presentation Mode active until the page is scrolled into view,
// to prevent issues in non-Mozilla browsers.
this.active = false;
this.args = null;
}.bind(this), 0);
window.removeEventListener('mousemove', this.mouseMove, false);
window.removeEventListener('mousedown', this.mouseDown, false);
window.removeEventListener('contextmenu', this.contextMenu, false);
this.hideControls();
this.args = null;
PDFView.clearMouseScrollState();
HandTool.exitPresentationMode();
this.container.removeAttribute('contextmenu');