From c6bf5f7c895287d2028f6024265913b59784a154 Mon Sep 17 00:00:00 2001
From: Karl Hallsby <karl@hallsby.com>
Date: Sun, 27 Sep 2020 17:45:13 -0500
Subject: Bring all of jekyll-text-theme _includes into site

---
 _includes/scripts/lib/gallery.js | 192 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 192 insertions(+)
 create mode 100644 _includes/scripts/lib/gallery.js

(limited to '_includes/scripts/lib/gallery.js')

diff --git a/_includes/scripts/lib/gallery.js b/_includes/scripts/lib/gallery.js
new file mode 100644
index 0000000..1793f04
--- /dev/null
+++ b/_includes/scripts/lib/gallery.js
@@ -0,0 +1,192 @@
+(function() {
+  {%- include scripts/lib/swiper.js -%}
+  var SOURCES = window.TEXT_VARIABLES.sources;
+  window.Lazyload.js(SOURCES.jquery, function() {
+    var template =
+      '<div class="swiper gallery__swiper">' +
+        '<div class="swiper__wrapper">' +
+        '</div>' +
+        '<div class="swiper__button swiper__button--prev fas fa-chevron-left"></div>' +
+        '<div class="swiper__button swiper__button--next fas fa-chevron-right"></div>' +
+      '</div>';
+    function setState($item, zoom, translate) {
+      $item.css('transform', 'scale(' + zoom + ') translate(' + translate.x +  'px,' + translate.y + 'px)');
+    }
+    function Gallery(root, items) {
+      this.$root = $(root);
+      this.$swiper = null;
+      this.$swiperWrapper = null;
+      this.$activeItem = null;
+      this.$items = [];
+      this.contentWidth = 0;
+      this.contentHeight = 0;
+      this.swiper = null;
+      this.items = items;
+      this.disabled = false;
+      this.curIndex = 0;
+      this.touchCenter = null;
+      this.lastTouchCenter = null;
+      this.zoomRect = null;
+      this.lastZoomRect = null;
+      this.lastTranslate = null;
+      this.translate = null;
+      this.lastZoom = 1;
+      this.preZoom = 1;
+      this.zoom = 1;
+    }
+    Gallery.prototype.init = function() {
+      var i, item, items = this.items, size, self = this, touchstartFingerCount = 0;
+      this.$root.append(template);
+      this.$swiper = this.$root.find('.gallery__swiper');
+      this.$swiperWrapper = this.$root.find('.swiper__wrapper');
+      this.contentWidth = this.$swiperWrapper && this.$swiperWrapper.width();
+      this.contentHeight = this.$swiperWrapper && this.$swiperWrapper.height();
+      for (i = 0; i < items.length; i++) {
+        item = items[i];
+        size = this._calculateImageSize(item.w, item.h);
+        this.$items.push($(
+          '<div class="swiper__slide">' +
+            '<div class="gallery-item">' +
+              '<div class="gallery-item__content">' +
+                '<img src="' + item.src + '" style="width:' + size.w + 'px;height:' + size.h +  'px"/>' +
+              '</div>' +
+            '</div>' +
+          '</div>'
+        ));
+      }
+      this.$swiperWrapper && this.$swiperWrapper.append(this.$items);
+      this.swiper = this.$swiper && this.$swiper.swiper({
+        onChangeEnd: function() {
+          self._handleChangeEnd.apply(self, Array.prototype.slice.call(arguments));
+        }
+      });
+      $(window).on('resize', function() {
+        if (self.disabled) { return; }
+        self._resizeImageSize();
+      });
+      // Char Code: 37  ⬅, 39  ➡
+      $(window).on('keyup', function(e) {
+        if (window.isFormElement(e.target || e.srcElement) || self.disabled) { return; }
+        if (e.which === 37) {
+          self.swiper && self.swiper.previous();
+        } else if (e.which === 39) {
+          self.swiper && self.swiper.next();
+        }
+      });
+      function getRect(touch0, touch1) {
+        return {
+          o: {
+            x: (touch0.pageX + touch1.pageX) / 2,
+            y: (touch0.pageY + touch1.pageY) / 2
+          },
+          w: Math.abs(touch0.pageX - touch1.pageX),
+          h: Math.abs(touch0.pageY - touch1.pageY)
+        };
+      }
+      function getTouches(e) {
+        return e.touches || e;
+      }
+      function getTouchesCount(e) {
+        if (e.touches) {
+          return e.touches.length;
+        } else {
+          return 1;
+        }
+      }
+      this.$swiperWrapper.on('touchstart', function(e) {
+        var touch0, touch1, rect;
+        touchstartFingerCount = getTouchesCount(e);
+        if (touchstartFingerCount > 1) {
+          touch0 = e.touches[0];
+          touch1 = e.touches[1];
+          rect = getRect(touch0, touch1);
+          self.lastZoomRect = { w: rect.w, h: rect.h };
+          self.lastTouchCenter = rect.o;
+        } else {
+          var touch = getTouches(e)[0];
+          self.lastTouchCenter = { x: touch.pageX, y: touch.pageY };
+        }
+      });
+      this.$swiperWrapper.on('touchmove', function(e) {
+        if (touchstartFingerCount === getTouchesCount(e)) {
+          if (touchstartFingerCount > 1) {
+            var touch0 = e.touches[0];
+            var touch1 = e.touches[1];
+            var rect = getRect(touch0, touch1);
+            self.zoomRect = { w: rect.w, h: rect.h };
+            self.touchCenter = rect.o;
+            self._zoom(); self._translate();
+            setState(self.$activeItem, self.zoom, self.translate);
+          } else {
+            var touch = getTouches(e)[0];
+            self.touchCenter = { x: touch.pageX, y: touch.pageY };
+            self._translate();
+            setState(self.$activeItem, self.zoom, self.translate);
+          }
+        }
+      });
+      this.$swiperWrapper.on('touchend', function(e) {
+        self.lastZoom = self.zoom;
+        self.lastTranslate = self.translate;
+        touchstartFingerCount = 0;
+      });
+      this.$root.on('touchmove', function(e) {
+        if (self.disabled) { return; }
+        e.preventDefault();
+      });
+    };
+
+    Gallery.prototype._translate = function() {
+      this.translate = this.touchCenter && this.lastTouchCenter && this.lastTranslate ? {
+        x: (this.touchCenter.x - this.lastTouchCenter.x) / this.zoom + this.lastTranslate.x,
+        y: (this.touchCenter.y - this.lastTouchCenter.y) / this.zoom + this.lastTranslate.y
+      } : { x: 0, y: 0 };
+    }
+    Gallery.prototype._zoom = function() {
+      this.zoom = (this.zoomRect.w + this.zoomRect.h) / (this.lastZoomRect.w + this.lastZoomRect.h) * this.lastZoom;
+      this.zoom > 1 ? this.$activeItem.addClass('zoom') : this.$activeItem.removeClass('zoom');
+      this.preZoom = this.zoom;
+    }
+
+    Gallery.prototype._calculateImageSize = function(w, h) {
+      var scale = 1;
+      if (this.contentWidth > 0 && this.contentHeight > 0 && w > 0 && h > 0) {
+        scale = Math.min(
+          Math.min(w, this.contentWidth) / w,
+          Math.min(h, this.contentHeight) / h);
+      }
+      return { w: Math.floor(w * scale), h: Math.floor(h * scale) };
+    };
+
+    Gallery.prototype._resizeImageSize = function() {
+      var i, $item, $items = this.$items, item, size;
+      this.contentWidth = this.$swiperWrapper && this.$swiperWrapper.width();
+      this.contentHeight = this.$swiperWrapper && this.$swiperWrapper.height();
+      if ($items.length < 1) { return; }
+      for (i = 0; i < $items.length; i++) {
+        item = this.items[i], $item = $items[i];
+        size = this._calculateImageSize(item.w, item.h);
+        item.width = size.w; item.height = size.h;
+        $item && $item.find('img').css({ width: size.w, height: size.h });
+      }
+    };
+    Gallery.prototype._handleChangeEnd = function(index, $dom, preIndex, $preDom) {
+      this.curIndex = index;
+      this.lastZoomRect = null; this.lastZoomRect = null;
+      this.lastTranslate = this.translate = { x: 0, y:0 };
+      this.lastZoom = this.preZoom = this.zoom = 1;
+      this.$activeItem = $dom.find('.gallery-item__content');
+      setState($preDom.find('.gallery-item__content'), this.zoom, this.translate);
+    };
+
+    Gallery.prototype.refresh = function() {
+      this.swiper && this.swiper.refresh();
+      this._resizeImageSize();
+    };
+    Gallery.prototype.setOptions = function(options) {
+      this.disabled = options.disabled;
+      this.swiper && this.swiper.setOptions(options);
+    };
+    window.Gallery = Gallery;
+  });
+})();
\ No newline at end of file
-- 
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