Underline links on hover

src/Types.ts

@@ -6,8 +6,8 @@ export type LinkMatcher = {
   id: number,
   regex: RegExp,
   handler: LinkMatcherHandler,
-  hoverStartCallback?: LinkMatcherHandler,
-  hoverEndCallback?: () => void,
+  hoverTooltipCallback?: LinkMatcherHandler,
+  hoverLeaveCallback?: () => void,
   matchIndex?: number,
   validationCallback?: LinkMatcherValidationCallback,
   priority?: number
@@ -20,3 +20,15 @@ export type Charset = {[key: string]: string};
 
 export type CharData = [number, string, number, number];
 export type LineData = CharData[];
+
+export type LinkHoverEvent = {
+  x: number,
+  y: number,
+  length: number
+};
+
+export enum LinkHoverEventTypes {
+  HOVER = 'linkhover',
+  TOOLTIP = 'linktooltip',
+  LEAVE = 'linkleave'
+};