Work on refactoring measurements out of Lesion Tracker package

- Removed AssociatedStudies Collection
- Measurement API is generated from configuration files
- Data exchange methods are defined in configuration

Packages/ohif-viewerbase/client/components/studyBrowser/imageThumbnail/imageThumbnail.js

@@ -0,0 +1,87 @@
+Template.imageThumbnail.onRendered(() => {
+    const instance = Template.instance();
+
+    // Declare DOM and jQuery objects
+    const $parent = instance.$('.imageThumbnail');
+    const $loading = $parent.find('.imageThumbnailLoadingIndicator');
+    const $loadingError = $parent.find('.imageThumbnailErrorLoadingIndicator');
+    const $element = $parent.find('.imageThumbnailCanvas');
+    const element = $element.get(0);
+
+    instance.refreshImage = () => {
+        // Disable cornerstone for thumbnail element and remove its canvas
+        cornerstone.disable(element);
+
+        // Enable cornerstone for thumbnail element again creating a new canvas
+        cornerstone.enable(element);
+
+        // Get the image ID
+        const stack = instance.data.thumbnail.stack;
+        const thumbnailIndex = instance.data.thumbnail.thumbnailIndex;
+        const imageInstance = stack.images[0];
+        const imageId = getImageId(imageInstance);
+
+        // Activate the loading state
+        $loading.css('display', 'block');
+
+        // Add the current index on the global thumbnail loading controller
+        ThumbnailLoading[thumbnailIndex] = imageId;
+
+        // Define a handler for success on image load
+        const loadSuccess = image => {
+            cornerstone.displayImage(element, image);
+            delete ThumbnailLoading[thumbnailIndex];
+            $loading.css('display', 'none');
+        };
+
+        // Define a handler for error on image load
+        const loadError = () => {
+            $loading.css('display', 'none');
+            $loadingError.css('display', 'block');
+        };
+
+        // Call cornerstone image loader with the defined handlers
+        cornerstone.loadAndCacheImage(imageId).then(loadSuccess, loadError);
+    };
+
+    // Run this computation every time the current study is changed
+    instance.autorun(() => {
+        // Check if there is a reactive var set for current study
+        if (instance.data.currentStudy) {
+            // Register a dependency from this computation on current study
+            instance.data.currentStudy.dep.depend();
+        }
+
+        // Wait for the new data and reresh the image thumbnail
+        Tracker.afterFlush(() => {
+            instance.refreshImage();
+        });
+    });
+});
+
+Template.imageThumbnail.onDestroyed(() => {
+    const instance = Template.instance();
+
+    // Declare DOM and jQuery objects
+    const $parent = instance.$('.imageThumbnail');
+    const $element = $parent.find('.imageThumbnailCanvas');
+    const element = $element.get(0);
+
+    cornerstone.disable(element);
+});
+
+Template.imageThumbnail.helpers({
+    // Executed every time the image loading progress is changed
+    percentComplete() {
+        const instance = Template.instance();
+        const thumbnailIndex = instance.data.thumbnail.thumbnailIndex;
+
+        // Register a dependency from this computation on Session key
+        const percentComplete = Session.get('CornerstoneThumbnailLoadProgress' + thumbnailIndex);
+
+        // Return the complete percent amount of the image loading
+        if (percentComplete && percentComplete !== 100) {
+            return percentComplete + '%';
+        }
+    }
+});