Mouse support

Not exactly the most elegant implementation, but it definitely works and
isn't really difficult to code around!

1 files changed, 26 insertions, 0 deletions

diff --git a/ui/DisplayElement.js b/ui/DisplayElement.js
index 66d29aa..952c78e 100644
--- a/ui/DisplayElement.js
+++ b/ui/DisplayElement.js
@@ -184,6 +184,32 @@ module.exports = class DisplayElement extends EventEmitter {
     return ancestors
   }
 
+  getElementAt(x, y) {
+    const children = this.children.slice()
+
+    // Start searching the last- (top-) rendered children first.
+    children.reverse()
+
+    for (const el of children) {
+      if (!el.visible) {
+        continue
+      }
+
+      const el2 = el.getElementAt(x, y)
+      if (el2) {
+        return el2
+      }
+
+      const { absX, absY, w, h } = el
+      if (absX <= x && absX + w > x) {
+        if (absY <= y && absY + h > y) {
+          return el
+        }
+      }
+    }
+    return null
+  }
+
   get absX() {
     if (this.parent) {
       return this.parent.contentX + this.x