1 files changed, 83 insertions, 0 deletions
diff --git a/webcards/scripts/cards/drag.js b/webcards/scripts/cards/drag.js
new file mode 100644
index 0000000..cce1e72
--- /dev/null
+++ b/webcards/scripts/cards/drag.js
@@ -0,0 +1,83 @@
+function MultiDrag() {
+    this.del = false;
+    this.drag = [];
+    window.addEventListener("mousemove", this.update.bind(this));
+    document.body.addEventListener("mouseleave", this.stopDraggingAll.bind(this));
+}
+
+MultiDrag.prototype = {
+    addDragEl: function(el, ox, oy, px, py, pt) {
+        if(this.del)
+            return;
+
+        el.style.transitionDuration = "0.04s";
+
+        this.drag.push({
+            e: el,
+            osx: ox,
+            osy: oy,
+            prx: px,
+            pry: py,
+            ptd: pt
+        });
+
+        return this.drag.length - 1;
+    },
+
+    startDragging: function(mevent) {
+        if(this.del)
+            return;
+
+        console.log(mevent);
+
+        if(mevent.button != 0)
+            return;
+
+        let pos = mevent.target.getBoundingClientRect();
+
+        return this.addDragEl(
+            mevent.currentTarget,
+            mevent.clientX - pos.left,
+            mevent.clientY - pos.top,
+            mevent.currentTarget.style.left,
+            mevent.currentTarget.style.top,
+            mevent.currentTarget.style.transitionDuration
+        );
+    },
+
+    stopDragging: function(i) {
+        this.del = true;
+
+        if (i < 0 || i >= this.drag.length)
+            return;
+        
+        this.drag[i].e.style.transitionDuration = this.drag[i].ptd;
+        this.drag[i].e.style.left = this.drag[i].prx;
+        this.drag[i].e.style.top = this.drag[i].pry;
+
+        this.drag.splice(i, 1);
+
+        this.del = false;
+    },
+
+    stopDraggingAll: function() {
+        this.del = true;
+
+        while (this.drag.length > 0) {
+            this.drag[0].e.style.transitionDuration = this.drag[0].ptd;
+            this.drag[0].e.style.left = this.drag[0].prx;
+            this.drag[0].e.style.top = this.drag[0].pry;
+
+            this.drag.shift();
+        }
+
+        this.del = false;
+    },
+
+    update: function(e) {
+        for (let i = 0; i < this.drag.length && !this.del; i++) {
+            this.drag[i].e.style.left = e.clientX - this.drag[i].osx + "px";
+            this.drag[i].e.style.top = e.clientY - this.drag[i].osy + "px";
+        }
+    }
+};
+\ No newline at end of file