add extensions

_extensions/shafayetShafee/reveal-header/resources/js/add_header.js

@@ -0,0 +1,130 @@
+/**
+ * reveal-header
+ * A filter that adds header text and logo.
+ * 
+ * MIT License
+ * Copyright (c) 2023 Shafayet Khan Shafee.
+ */
+
+function header() {
+  
+  // add the header structure as the firstChild of div.reveal-header
+  function add_header() {
+    let header = document.querySelector("div.reveal-header");
+    let reveal = document.querySelector(".reveal");
+    reveal.insertBefore(header, reveal.firstChild);
+    
+    logo_img = document.querySelector('.header-logo img');
+    if (logo_img.getAttribute('src') == null) {
+      if (logo_img?.getAttribute('data-src') != null) {
+        logo_img.src = logo_img?.getAttribute('data-src') || "";
+        logo_img.removeAttribute('data-src'); 
+      };
+    };
+  };
+    
+  // add the class inverse-header for slide with has-dark-background class
+  // otherwise remove it.
+  function add_class(has_dark, header_paras) {
+    header_paras.forEach(el => {
+      el.classList.remove('inverse-header');
+      if(has_dark) {
+        el.classList.add('inverse-header');
+      };
+    });
+  };
+  
+  
+  // dynamically changing the header
+  function change_header(dheader, cheader, ctext) {
+    // dhead => dynamic header
+    // chead => constant header
+    // ctext => contstant header_text inner html
+    if (dheader !== null) {
+      cheader.innerHTML = dheader.innerHTML;  
+    } else {
+      cheader.innerHTML = ctext;
+    };
+  };
+  
+  function hide_from_title_slide(element) {
+      Reveal.on( 'slidechanged' , event => {
+        if (event.currentSlide.matches('#title-slide')) {
+          element.style.visibility = 'hidden';
+        } else {
+          element.style.visibility = 'visible';
+        }
+      });
+    };
+  
+  
+  if (Reveal.isReady()) {
+    
+    add_header();
+    
+    if (document.querySelector('div.reveal.has-logo') != null) {
+      var slide_number = document.querySelector('div.slide-number');
+      var header = document.querySelector("div.reveal-header");
+      header.appendChild(slide_number);
+    };
+  
+    // Get the default header text element and innner HTML (i.e. literal text)
+    var header_text = document.querySelector("div.header-text p");
+    const header_inner_html = header_text.innerHTML;
+    
+    var header_paras = document.querySelectorAll("div.reveal-header p");
+    var dark = Reveal.getCurrentSlide().classList.contains('has-dark-background');
+    add_class(dark, header_paras);
+    
+    Reveal.on( 'slidechanged', event => {
+      var has_dark = event.currentSlide.classList.contains('has-dark-background');
+      add_class(has_dark, header_paras);
+    });
+    
+    // make the visibility of slide specific header text defined in slide body none
+    document.querySelectorAll('div.header').forEach(el => {
+      el.style.display = 'none';
+    });
+    
+    
+    // change the header if currently loaded slide has the header div defined
+    // which won't be captured by slidechanged event unless we change slides.
+    let dynamic_header = Reveal.getCurrentSlide().querySelector('div.header p');
+    change_header(dynamic_header, header_text, header_inner_html);
+    
+    Reveal.on( 'slidechanged', event => {
+      let dyn_header = event.currentSlide.querySelector('div.header p');
+      change_header(dyn_header, header_text, header_inner_html);
+    });
+    
+    /************** header text in title slide if title or ***********************/
+    /*************  subtitle is used as header text        ***********************/
+    
+    var title_text = document.querySelector('.reveal-header .title-text p');
+    if (title_text != null) {
+      title_text.style.visibility = 'hidden';
+      hide_from_title_slide(title_text);
+    };
+    
+    /*************** hide header text and logo on title slide ********************/
+    
+    var hide_header_text = document.querySelector('.header-text').getAttribute('data-hide-from-titleslide');
+    var hide_header_logo = document.querySelector('.header-logo').getAttribute('data-hide-from-titleslide');
+    
+    if (hide_header_text == 'true') {
+      header_text.style.visibility = 'hidden';
+      hide_from_title_slide(header_text);
+    }
+    
+    if (hide_header_logo == 'true') {
+      logo_img.style.visibility = 'hidden';
+      hide_from_title_slide(logo_img);
+    } 
+    
+  }; 
+};
+
+
+window.addEventListener("load", (event) => {
+  header();
+});

_extensions/shafayetShafee/reveal-header/resources/js/sc_sb_title.js

@@ -0,0 +1,93 @@
+/**
+ * reveal-header
+ * A filter that adds header text and logo.
+ * 
+ * MIT License
+ * Copyright (c) 2023 Shafayet Khan Shafee.
+ */
+ 
+ function add_sc_sb_title() {
+   
+   function get_title() {
+    var h1_arr = [];
+    var h2_arr = [];
+  
+    Reveal.getSlides().forEach(el => {
+      if (!el.matches('#title-slide')) {
+       var h1 = el.querySelector('.title-slide h1')?.innerText;
+       var h2 = el.querySelector('.title-slide h2')?.innerText;
+       h1_arr.push(h1);
+       h2_arr.push(h2);
+      };
+    });
+    
+    return [h1_arr, h2_arr]
+  };
+    
+  function fill_array(ar) {
+    let last_val = ar[0] || " ";
+    for (let i = 1; i < ar.length; i++) {
+      if (typeof ar[i] === 'undefined') {
+        ar[i] = last_val;
+      } else {
+        last_val = ar[i];
+      }
+    }
+    return ar
+  };
+  
+  
+  if (Reveal.isReady()) {
+  
+    if (document.querySelector('div.reveal-header img').getAttribute('src').length == 0) {
+      document.querySelector('div.reveal-header').classList.add('no-logo')
+    }
+  
+    var [h1_array, h2_array] = get_title();
+    var filled_h1_array = fill_array(h1_array);
+    var filled_h2_array = fill_array(h2_array);
+    
+    Reveal.getSlides().forEach((el, idx) => {
+      if (!el.matches('#title-slide')) {
+        el.setAttribute('data-sc-title', filled_h1_array[(idx - 1)])
+        el.setAttribute('data-sb-title', filled_h2_array[(idx - 1)])
+      }
+    });
+  
+    Reveal.on( 'slidechanged', event => {
+      let sp = Reveal.getSlidesElement().querySelector('.stack.present');
+      
+      if (sp != null) {
+        let header = document.querySelector("div.reveal-header");
+        
+        // handling h1 section title (`.sc-title`)
+        var section_text = event.currentSlide.getAttribute('data-sc-title') || " ";
+        if (event.currentSlide.matches('.title-slide.level1')) {
+          header.querySelector('.sc-title p').innerText = ""; 
+        } else if (event.currentSlide.matches('.title-slide.level2')) {
+          header.querySelector('.sc-title p').innerText = section_text;  
+        } else {
+          header.querySelector('.sc-title p').innerText = section_text;
+        };
+        
+        // handling h2 section title (`.sb-title`)
+        var sbsection_text = event.currentSlide.getAttribute('data-sb-title') || " ";
+        if (event.currentSlide.matches('.title-slide.level1')) {
+          header.querySelector('.sb-title p').innerText = "";
+        } else if (event.currentSlide.matches('.title-slide.level2')) {
+          header.querySelector('.sb-title p').innerText = "";
+        } else {
+          header.querySelector('.sb-title p').innerText = sbsection_text;
+        };
+      };
+    });
+  };
+};
+
+
+window.addEventListener("load", (event) => {
+  add_sc_sb_title();
+});
+
+
+