Merge pull request #1724 from UlrichB22/slideshow2

SlideShow macro: add docs and key control

Author: UlrichB22

docs/user/moinwiki.rst

@@ -826,6 +826,8 @@ extra features. The following is a table of MoinMoin's macros.
 +-------------------------------------------+------------------------------------------------------------+
 | ``<<ShowWikiDict()>>``                    | Displays metadata defined in wikidict attribute            |
 +-------------------------------------------+------------------------------------------------------------+
+| ``<<SlideShow()>>``                       | Displays a link to start a slideshow for the current item  |
++-------------------------------------------+------------------------------------------------------------+
 | ``<<TableOfContents(2)>>``                | Shows a table of contents up to level 2                    |
 +-------------------------------------------+------------------------------------------------------------+
 | ``<<TitleIndex()>>``                      | Lists all itemnames for the namespace of the current item, |
@@ -896,6 +898,11 @@ fixed_height and anniversary.
     - <<MonthCalendar(month=12)>>  Calendar of current Page, this year's december
     - <<MonthCalendar(year=2022,month=12)>>  Calendar of December, 2022
 
+The **SlideShow** macro creates a link to start a presentation for the current item. The slides
+are separated by level 1 and 2 headings. The text before the first heading is ignored. Navigation
+within the slideshow can be controlled via corresponding buttons at the edge or bottom of the
+browser screen or using the left and right arrow keys.
+
 
 Smileys and Icons
 =================

src/moin/help/help-en/MoinWikiMacros.data

@@ -548,6 +548,28 @@ represents sample output.
 
 {'dog': 'Hund', 'cat': 'Katze'}
 
+=== SlideShow ===
+
+A slideshow can be defined on a single wiki page, with the slides separated by level 1 and 2 headings.
+The text before the first heading is ignored. The macro creates a link to start the presentation.
+
+Navigating through the slides works by various means:
+
+ * Use the left and right arrow keys to move to the previous and next slide
+ * Alternatively, you can click on the gray navigation links on the left and right edges of the screen
+ * There are icons at the bottom to switch to the first or last slide and to exit presentation mode
+ * Use the up and down arrow keys to scroll up and down within the content if it does not fit in the browser window
+ * The browser's built-in zoom function can be used to adjust the size of the presentation to your needs
+
+'''Markup:'''
+
+{{{
+    <<SlideShow()>>
+}}}
+
+'''Result:'''
+
+  <<SlideShow()>>
 
 === TitleIndex ===
 

src/moin/help/help-en/MoinWikiMacros.meta

@@ -3,7 +3,7 @@
   "address": "127.0.0.1",
   "comment": "",
   "contenttype": "text/x.moin.wiki;charset=utf-8",
-  "dataid": "f1524f1f521a4600b3cb55caa557b558",
+  "dataid": "e5c04311b38c46029e237c0c12f3aa40",
   "externallinks": [
     "https://fontawesome.com/search?o=r&m=free",
     "https://moinmo.in/HelpOnMacros/Include"
@@ -19,16 +19,16 @@
   ],
   "itemtype": "default",
   "language": "en",
-  "mtime": 1710879680,
+  "mtime": 1723402687,
   "name": [
     "MoinWikiMacros"
   ],
   "name_old": [],
   "namespace": "help-en",
   "rev_number": 1,
-  "revid": "d61a54ba4e924b418d421b6b27c74616",
-  "sha1": "f3443067aeb6adf5ef47ec171052bfb01b0855d3",
-  "size": 13603,
+  "revid": "dfc263543dd84e4b9fbe6b64dd983b58",
+  "sha1": "0064f57340dac2f337760e88e5bd57fc9ef550b1",
+  "size": 14479,
   "summary": "",
   "tags": [
     "macros",

src/moin/templates/slideshow.html

@@ -27,29 +27,38 @@
       let slides = document.getElementsByClassName("moin-slides");
       showSlide(slideNo);
 
+      document.addEventListener("keydown", (event) => {
+          if (event.code === "ArrowLeft") {
+              prevSlide();
+          }
+          if (event.code === "ArrowRight") {
+              nextSlide();
+          }
+      });
+
       function nextSlide() {
-        if (slideNo < slides.length) {
-        showSlide(slideNo += 1);
-        }
+          if (slideNo < slides.length) {
+              showSlide((slideNo += 1));
+          }
       }
 
       function prevSlide() {
-        if (slideNo > 1) {
-        showSlide(slideNo -= 1);
-        }
+          if (slideNo > 1) {
+              showSlide((slideNo -= 1));
+          }
       }
 
       function lastSlide() {
-        showSlide(slides.length);
+          showSlide(slides.length);
       }
 
       function showSlide(n) {
-        let i;
-        slideNo = n;
-        for (i = 0; i < slides.length; i++) {
-          slides[i].style.display = "none";
-        }
-        slides[slideNo - 1].style.display = "block";
+          let i;
+          slideNo = n;
+          for (i = 0; i < slides.length; i++) {
+              slides[i].style.display = "none";
+          }
+          slides[slideNo - 1].style.display = "block";
       }
     </script>
 {% endblock %}