+
+/*
+ * Create a shortcut on a number key to jump to a named slide.
+ *
+ * Using the hotkey on the target slide will go "back" to the slide that was active before jumping
+ * to the target slide.
+ *
+ * Example: Jump to the slide named "myslide" when the "1" key is pressed.
+ * createHotkey(1, 'myslide');
+ */
+function createHotkey(key, slideName) {
+ var targetSlide = slideshow.getSlideByName(slideName);
+ var lastSlide = -1;
+ document.addEventListener('keydown', function(e) {
+ if (e.which === key + 48) {
+ var currentNum = slideshow.getCurrentSlideIndex() + 1;
+ var targetNum = targetSlide.getSlideIndex() + 1;
+ if (currentNum !== targetNum) {
+ lastSlide = currentNum;
+ slideshow.gotoSlide(targetNum);
+ }
+ else {
+ slideshow.gotoSlide(lastSlide);
+ }
+ }
+ });
+};
+
+/*
+ * Set a hotkey "u" to navigate backwards in time.
+ *
+ * If you get on the wrong slide, this might be the easiest way to get back on track. This is what
+ * you might expect the browser's "Back" button to do if it worked.
+ */
+(function() {
+ var history = [];
+ var skip = false;
+ slideshow.on('hideSlide', function(slide) {
+ if (skip) {
+ skip = false;
+ return;
+ }
+ history.push(slide.getSlideIndex() + 1);
+ });
+ document.addEventListener('keydown', function(e) {
+ if (e.which === 85 /* [u]ndo */) {
+ var lastNum = history.pop();
+ if (lastNum) {
+ skip = true;
+ slideshow.gotoSlide(lastNum);
+ }
+ }
+ });
+})();
+
projects / chaz / talk-introduction-to-psgi / commitdiff
