Added hotkey support to viewerbase

Packages/viewerbase/lib/WLPresets.js

@@ -0,0 +1,21 @@
+applyWLPreset = function(presetName, element) {
+    var viewport = cornerstone.getViewport(element);
+
+    if (presetName === 'Default') {
+        var enabledElement = cornerstone.getEnabledElement(element);
+        viewport.voi.windowWidth = enabledElement.image.windowWidth;
+        viewport.voi.windowCenter = enabledElement.image.windowCenter;
+    } else {
+        var preset = OHIF.viewer.wlPresets[presetName];
+        viewport.voi.windowWidth = preset.ww;
+        viewport.voi.windowCenter = preset.wc;
+    }
+
+    // Update the viewport
+    cornerstone.setViewport(element, viewport);
+};
+
+applyWLPresetToActiveElement = function(presetName) {
+    var element = getActiveViewportElement();
+    applyWLPreset(presetName, element);
+};