BL-15721 show bubbles on top of videos

src/BloomBrowserUI/bookEdit/css/editMode.less

@@ -1640,21 +1640,34 @@ svg.bloom-videoControl {
     }
 }
 
+// Detector above the canvas so we can detect hover and clicks of playback controls
+.bloom-videoMouseDetector {
+    height: 100%;
+    width: 100%;
+    position: absolute;
+    top: 0;
+    z-index: @canvasElementCanvasZIndex + 1;
+}
+
 // Show pause and replay when playing and hovered.
-.bloom-videoContainer.playing:hover {
-    .bloom-videoControlContainer {
-        &.bloom-videoPauseIcon,
-        &.bloom-videoReplayIcon {
-            display: flex;
+.bloom-videoContainer.playing {
+    .bloom-videoMouseDetector:hover {
+        .bloom-videoControlContainer {
+            &.bloom-videoPauseIcon,
+            &.bloom-videoReplayIcon {
+                display: flex;
+            }
         }
     }
 }
 
 // Show play, centered, when hovering a video that is not paused or playing
-.bloom-videoContainer:not(.paused):not(.playing):hover {
-    .bloom-videoPlayIcon {
-        display: flex;
-        left: calc(50% - @videoIconSize / 2);
+.bloom-videoContainer:not(.paused):not(.playing) {
+    .bloom-videoMouseDetector:hover {
+        .bloom-videoPlayIcon {
+            display: flex;
+            left: calc(50% - @videoIconSize / 2);
+        }
     }
 }
 

src/BloomBrowserUI/bookEdit/js/CanvasElementManager.ts

@@ -6426,7 +6426,8 @@ export class CanvasElementManager {
                 .find(".bloom-ui")
                 .filter(
                     (_, x) =>
-                        !x.classList.contains("bloom-videoControlContainer"),
+                        !x.classList.contains("bloom-videoControlContainer") &&
+                        !x.classList.contains("bloom-videoMouseDetector"),
                 )
                 .remove();
             thisCanvasElement.find(".bloom-dragHandleTOP").remove(); // BL-7903 remove any left over drag handles (this was the class used in 4.7 alpha)

src/BloomBrowserUI/bookEdit/js/bloomVideo.ts

@@ -30,9 +30,14 @@ export function SetupVideoEditing(container) {
             // debugging, and just might prevent a problem in normal operation.
             videoElement.parentElement?.classList.remove("playing");
             videoElement.parentElement?.classList.remove("paused");
-            videoElement.addEventListener("click", handleVideoClick);
+            const mouseDetector =
+                videoElement.ownerDocument.createElement("div");
+            mouseDetector.classList.add("bloom-videoMouseDetector");
+            mouseDetector.classList.add("bloom-ui"); // don't save as part of document
+            mouseDetector.addEventListener("click", handleVideoClick);
+            videoElement.parentElement?.appendChild(mouseDetector);
             const playButton = wrapVideoIcon(
-                videoElement,
+                mouseDetector,
                 // Alternatively, we could import the Material UI icon, make this file a TSX, and use
                 // ReactDom.render to render the icon into the div. But just creating the SVG
                 // ourselves (as these methods do) seems more natural to me. We would not be using
@@ -43,13 +48,13 @@ export function SetupVideoEditing(container) {
             );
             playButton.addEventListener("click", handlePlayClick);
             const pauseButton = wrapVideoIcon(
-                videoElement,
+                mouseDetector,
                 getPauseIcon("#ffffff", videoElement),
                 "bloom-videoPauseIcon",
             );
             pauseButton.addEventListener("click", handlePauseClick);
             const replayButton = wrapVideoIcon(
-                videoElement,
+                mouseDetector,
                 getReplayIcon("#ffffff", videoElement),
                 "bloom-videoReplayIcon",
             );
@@ -296,17 +301,17 @@ export function updateVideoInContainer(container: Element, url: string): void {
 // configure one of the icons we display over videos. We put a div around it and apply
 // various classes and append it to the parent of the video.
 function wrapVideoIcon(
-    videoElement: HTMLVideoElement,
+    parent: HTMLElement,
     icon: HTMLElement,
     iconClass: string,
 ): HTMLElement {
-    const wrapper = videoElement.ownerDocument.createElement("div");
+    const wrapper = parent.ownerDocument.createElement("div");
     wrapper.classList.add("bloom-videoControlContainer");
     wrapper.classList.add("bloom-ui"); // don't save as part of document
     wrapper.appendChild(icon);
     wrapper.classList.add(iconClass);
     icon.classList.add("bloom-videoControl");
-    videoElement.parentElement?.appendChild(wrapper);
+    parent.appendChild(wrapper);
     return icon;
 }
 

src/content/bookLayout/basePage.less

@@ -323,8 +323,13 @@ books may contain divs with box-header-off, so we need a rule to hide them.*/
             background-size: contain;
         }
 
-        // above canvas so we can click playback controls
-        z-index: @canvasElementCanvasZIndex + 1;
+        // When the book is viewed in an older version of BloomPlayer, we want to set z-index to make the video controls
+        // clickable like we used to do before BL-15721, even that means any speech bubbles will be behind the video.
+        // Newer versions of BloomPlayer will add a .videoMouseDetector element to detect clicks so that in that case
+        // we can avoid setting z-index here and so allow speech bubbles to be in front of the video.
+        &:not(:has(.bloom-videoMouseDetector)):not(:has(.videoMouseDetector)) {
+            z-index: @canvasElementCanvasZIndex + 1;
+        }
 
         video {
             // I don't know exactly why this works, but it makes the video shrink to fit,