Issue #414: part1: add opacity to Layer model

src/js/model/Layer.js

@@ -7,6 +7,7 @@
     } else {
       this.name = name;
       this.frames = [];
+      this.opacity = 1;
     }
   };
 
@@ -31,6 +32,17 @@
     this.name = name;
   };
 
+  ns.Layer.prototype.getOpacity = function () {
+    return this.opacity;
+  };
+
+  ns.Layer.prototype.setOpacity = function (opacity) {
+    if (opacity === null || isNaN(opacity) || opacity < 0 || opacity > 1) {
+      return;
+    }
+    this.opacity = opacity;
+  };
+
   ns.Layer.prototype.getFrames = function () {
     return this.frames;
   };

test/js/model/LayerTest.js

@@ -0,0 +1,39 @@
+describe("Layer model test", function() {
+
+  beforeEach(function() {});
+  afterEach(function() {});
+
+  it("has proper defaults", function() {
+    var layer = new pskl.model.Layer('layerName');
+
+    expect(layer.getOpacity()).toBe(1);
+    expect(layer.getFrames().length).toBe(0);
+    expect(layer.getName()).toBe('layerName');
+  });
+
+  it("can set opacity", function() {
+    var layer = new pskl.model.Layer('layerName');
+
+    layer.setOpacity(0.5);
+    expect(layer.getOpacity()).toBe(0.5);
+  });
+
+  it("ignores bad opacity", function() {
+    var layer = new pskl.model.Layer('layerName');
+
+    layer.setOpacity(0.3);
+    expect(layer.getOpacity()).toBe(0.3);
+
+    layer.setOpacity('Yep I\'m an opacity, let me in !');
+    expect(layer.getOpacity()).toBe(0.3);
+
+    layer.setOpacity(9000);
+    expect(layer.getOpacity()).toBe(0.3);
+
+    layer.setOpacity(-1);
+    expect(layer.getOpacity()).toBe(0.3);
+
+    layer.setOpacity(null);
+    expect(layer.getOpacity()).toBe(0.3);
+  });
+});