Revert of AudioPlayer: Update control panel with playback progress bar.

ui/file_manager/audio_player/elements/control_panel.css

Index: ui/file_manager/audio_player/elements/control_panel.css
diff --git a/ui/file_manager/audio_player/elements/control_panel.css b/ui/file_manager/audio_player/elements/control_panel.css
index 78624e42e4dca8a8a60f739ea2a8fe162ffe7acb..4e5b533de9ab34d7428c97fdf9e4a3d99636b9d0 100644
--- a/ui/file_manager/audio_player/elements/control_panel.css
+++ b/ui/file_manager/audio_player/elements/control_panel.css
@@ -8,17 +8,19 @@
   background-color: white;
   display: flex;
   flex-direction: column;
-  height: 96px;
+  height: 64px;
   justify-content: center;
   padding: 0;
 }
 
-.controls .upper-controls,
+.controls .upper-controls {
+  height: 32px;
+  width: 100%
+}
+
 .controls .lower-controls {
-  box-sizing: border-box;
-  height: 48px;
-  padding: 8px;
-  width: 100%;
+  height: 32px;
+  width: 100%
 }
 
 .audio-controls {
@@ -80,38 +82,171 @@
   justify-content: center;
 }
 
-.time-controls > .time-container {
-  color: rgb(51, 51, 51);
+.custom-slider.progress {
+  display: flex;
+  flex: 1 1 auto;
+  height: 100%;
+  position: relative;
+  z-index: 0;  /* Make a layer which includes the thumb on slider. */
+}
+
+.custom-slider.progress > input[type='range']::-webkit-slider-thumb {
+  background-image: -webkit-image-set(
+      url(../assets/100/player_timeline_handler.png) 1x,
+      url(../assets/200/player_timeline_handler.png) 2x);
+  width: 28px;
+}
+
+.custom-slider.progress > input[type='range']::-webkit-slider-thumb:hover {
+  background-image: -webkit-image-set(
+      url(../assets/100/player_timeline_handler.png) 1x,
+      url(../assets/200/player_timeline_handler.png) 2x);
+}
+
+.custom-slider.progress > input[type='range']::-webkit-slider-thumb:active {
+  background-image: -webkit-image-set(
+      url(../assets/100/player_timeline_handler_pressed.png) 1x,
+      url(../assets/200/player_timeline_handler_pressed.png) 2x);
+}
+
+.custom-slider.progress.disabled > input[type='range']::-webkit-slider-thumb {
+  background-image: none;
+}
+
+.time-controls > .time {
   cursor: default;
-  flex: none;
+  height: 100%;
+  position: relative;
+  width: 53px;
+}
+
+.time-controls > .time.disabled {
+  opacity: 0;
+}
+
+.custom-slider > input[type='range'] {
+  -webkit-appearance: none !important;  /* Hide the default thumb icon. */
+  background: transparent;  /* Hide the standard slider bar */
+  height: 100%;
+  left: -2px;  /* Required to align the input element with the parent. */
+  outline: none;
+  position: absolute;
+  top: -2px;
+  width: 100%;
+}
+
+/* Custom thumb icon. */
+.custom-slider > input[type='range']::-webkit-slider-thumb {
+  -webkit-appearance: none;
+  background-position: center center;
+  background-repeat: no-repeat;
+  height: 24px;
+  position: relative;
+  z-index: 2;
+}
+
+/* Custom slider bar (we hide the standard one). */
+.custom-slider > .bar {
+  background-image: -webkit-image-set(
+      url(../assets/100/player_timeline_base_center.png) 1x,
+      url(../assets/200/player_timeline_base_center.png) 2x);
+  /* In order to match the horizontal position of the standard slider bar
+     left and right must be equal to 1/2 of the thumb icon width. */
+  bottom: 15px;
+  left: 14px;  /* Exactly 1/2 of the thumb width */
+  pointer-events: none;  /* Mouse events pass through to the standard input. */
+  position: absolute;
+  right: 14px;
+  top: 15px;
+}
+
+.custom-slider > .bar > .filled,
+.custom-slider > .bar > .cap {
+  bottom: 0;
+  position: absolute;
+  top: 0;
+}
+
+/* The filled portion of the slider bar to the left of the thumb. */
+.custom-slider > .bar > .filled {
+  background-image: -webkit-image-set(
+      url(../assets/100/player_timeline_played_center.png) 1x,
+      url(../assets/200/player_timeline_played_center.png) 2x);
+  border-left-style: none;
+  border-right-style: none;
+  left: 0;
+  width: 0; /* The element style.width is manipulated from the code. */
+}
+
+/* Rounded caps to the left and right of the slider bar. */
+.custom-slider > .bar > .cap {
+  width: 1px;
+}
+
+/* Left cap is always filled, should be the same color as .filled. */
+.custom-slider > .bar > .cap.left {
+  background-image: -webkit-image-set(
+      url(../assets/100/player_timeline_played_left.png) 1x,
+      url(../assets/200/player_timeline_played_left.png) 2x);
+  right: 100%;
+}
+
+/* Right cap is always not filled. */
+.custom-slider > .bar > .cap.right {
+  background-image: -webkit-image-set(
+      url(../assets/100/player_timeline_base_right.png) 1x,
+      url(../assets/200/player_timeline_base_right.png) 2x);
+  left: 100%;
+}
+
+.media-button.disabled,
+.custom-slider.disabled,
+.custom-slider.readonly {
+  pointer-events: none;
+}
+
+/* Progress seek marker (precise time shown on mouse hover. */
+
+/* Thin vertical line across the slider bar */
+.custom-slider > .bar > .seek-mark {
+  background-color: #202020;
+  bottom: -1px;
+  left: 0;
+  position: absolute;
+  top: -1px;
+  width: 0;
+}
+
+.custom-slider > .bar > .seek-mark.visible {
+  width: 1px;
+}
+
+.custom-slider > .bar > .seek-mark.inverted {
+  background-color: #808080;
+}
+
+/* Text label giving the precise time corresponding to the hover position. */
+.custom-slider > .bar > .seek-mark > .seek-label {
+  align-items: center;
+  background: #202020;
+  border-top-left-radius: 2px;
+  border-top-right-radius: 2px;
+  bottom: 19px;
+  color: white;
+  display: flex;
+  flex-direction: row;
   font-size: 12px;
-  padding: 8px;
-  position: relative;
-}
-
-.time-container > .time {
-  position: absolute;
-  right: 8px; /* Should be same as time-container's right padding. */
-  top: 8px; /* Should be same as time-container's top padding. */
-}
-
-.time-container > .time.disabled {
+  height: 15px;
+  justify-content: center;
+  left: 0;
   opacity: 0;
-}
-
-.time-container > .time-spacer {
-  opacity: 0; /* This class is intended to be used as invisible spacer. */
-}
-
-.time-controls > paper-slider {
-  --paper-slider-active-color: rgb(66, 133, 244);
-  --paper-slider-knob-color: rgb(64, 138, 241);
-  flex: auto;
-}
-
-.media-button.disabled,
-paper-slider.disabled {
-  pointer-events: none;
+  overflow: hidden;
+  position: absolute;
+  transition: opacity 150ms ease;
+}
+
+.custom-slider > .bar > .seek-mark.visible > .seek-label {
+  opacity: 1;
 }
 
 /* Media controls in order of appearance. */
@@ -228,14 +363,25 @@
 }
 
 /* Invisible div used to compute the width required for the elapsed time. */
+.time-controls > .time > .duration,
 .time-controls > .time > .current {
   align-items: center;
+  color: rgb(51, 51, 51);
   display: flex;
   flex-direction: row;
+  font-size: 12px;
   height: 100%;
   justify-content: flex-end;
   position: absolute;
   top: -1px;
+}
+
+.time-controls > .time > .duration {
+  left: 0;
+}
+
+.time-controls > .time > .current {
+  right: 0;
 }
 
 /* Volume controls: sound button and volume slider */