[ProgressIndicator] Added the customization of setting the stop inidcator padding.

PiperOrigin-RevId: 738518813

Author: pekingme

docs/components/ProgressIndicator.md

@@ -309,6 +309,7 @@ Element                          | Attribute                        | Related me
 **Indeterminate animation type** | `app:indeterminateAnimationType` | `setIndeterminateAnimationType`<br>`getIndeterminateAnimationType`                                | `disjoint`
 **Indicator direction**          | `app:indicatorDirectionLinear`   | `setIndicatorDirection`<br>`getIndicatorDirection`                                                | `leftToRight`
 **Track stop indicator size**    | `app:trackStopIndicatorSize`     | `setTrackStopIndicatorSize`<br>`getTrackStopIndicatorSize`                                        | `4dp`
+**Track stop indicator padding** | `app:trackStopIndicatorPadding`  | `setTrackStopIndicatorPadding`<br>`getTrackStopIndicatorPadding`                                  | `none`
 **Track inner corner radius**    | `app:trackInnerCornerRadius`     | `setTrackInnerCornerRadius`<br>`setTrackInnerCornerRadiusFraction`<br>`getTrackInnerCornerRadius` | `none` (use `trackCornerRadius`)
 
 #### Circular type specific attributes

lib/java/com/google/android/material/progressindicator/LinearDrawingDelegate.java

@@ -377,11 +377,15 @@ void drawStopIndicator(
       // Draws the stop indicator at the end of the track if needed.
       paint.setStyle(Style.FILL);
       paint.setColor(paintColor);
+      float stopIndicatorCenterX =
+          spec.trackStopIndicatorPadding != null
+              ? spec.trackStopIndicatorPadding.floatValue() + spec.trackStopIndicatorSize / 2f
+              : displayedTrackThickness / 2;
       drawRoundedBlock(
           canvas,
           paint,
           new PathPoint(
-              new float[] {trackLength / 2 - displayedTrackThickness / 2, 0}, new float[] {1, 0}),
+              new float[] {trackLength / 2 - stopIndicatorCenterX, 0}, new float[] {1, 0}),
           spec.trackStopIndicatorSize,
           spec.trackStopIndicatorSize,
           displayedCornerRadius * spec.trackStopIndicatorSize / displayedTrackThickness);

lib/java/com/google/android/material/progressindicator/LinearProgressIndicator.java

@@ -33,6 +33,7 @@
 import androidx.annotation.RestrictTo.Scope;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
+import java.util.Objects;
 
 /**
  * This class implements the linear type progress indicators.
@@ -249,6 +250,33 @@ public void setTrackStopIndicatorSize(@Px int trackStopIndicatorSize) {
     }
   }
 
+  /**
+   * Returns the padding of the stop indicator at the end of the track in pixels.
+   *
+   * @see #setTrackStopIndicatorPadding(int)
+   * @attr ref
+   *     com.google.android.material.progressindicator.R.styleable#LinearProgressIndicator_trackStopIndicatorPadding
+   */
+  @Nullable
+  public Integer getTrackStopIndicatorPadding() {
+    return spec.trackStopIndicatorPadding;
+  }
+
+  /**
+   * Sets the padding of the stop indicator at the end of the track in pixels.
+   *
+   * @param trackStopIndicatorPadding The new stop indicator padding in pixels.
+   * @see #getTrackStopIndicatorPadding()
+   * @attr ref
+   *     com.google.android.material.progressindicator.R.styleable#LinearProgressIndicator_trackStopIndicatorPadding
+   */
+  public void setTrackStopIndicatorPadding(@Nullable Integer trackStopIndicatorPadding) {
+    if (!Objects.equals(spec.trackStopIndicatorPadding, trackStopIndicatorPadding)) {
+      spec.trackStopIndicatorPadding = trackStopIndicatorPadding;
+      invalidate();
+    }
+  }
+
   /**
    * Returns the type of indeterminate animation of this progress indicator.
    *

lib/java/com/google/android/material/progressindicator/LinearProgressIndicatorSpec.java

@@ -51,6 +51,9 @@ public final class LinearProgressIndicatorSpec extends BaseProgressIndicatorSpec
   /** The size of the stop indicator at the end of the track. */
   @Px public int trackStopIndicatorSize;
 
+  /** The padding of the stop indicator at the end of the track. */
+  @Nullable public Integer trackStopIndicatorPadding;
+
   @Px public int trackInnerCornerRadius;
   public float trackInnerCornerRadiusFraction;
   public boolean useRelativeTrackInnerCornerRadius;
@@ -102,6 +105,10 @@ public LinearProgressIndicatorSpec(
         min(
             a.getDimensionPixelSize(R.styleable.LinearProgressIndicator_trackStopIndicatorSize, 0),
             trackThickness);
+    if (a.hasValue(R.styleable.LinearProgressIndicator_trackStopIndicatorPadding)) {
+      trackStopIndicatorPadding =
+          a.getDimensionPixelSize(R.styleable.LinearProgressIndicator_trackStopIndicatorPadding, 0);
+    }
     TypedValue trackInnerCornerRadiusValue =
         a.peekValue(R.styleable.LinearProgressIndicator_trackInnerCornerRadius);
     if (trackInnerCornerRadiusValue != null) {

lib/java/com/google/android/material/progressindicator/res-public/values/public.xml

@@ -37,6 +37,7 @@
   <public name="indeterminateAnimationType" type="attr"/>
   <public name="indicatorDirectionLinear" type="attr"/>
   <public name="trackInnerCornerRadius" type="attr"/>
+  <public name="trackStopIndicatorPadding" type="attr"/>
 
   <!-- CircularProgressIndicator attributes -->
   <public name="indicatorInset" type="attr"/>

lib/java/com/google/android/material/progressindicator/res/values/attrs.xml

@@ -163,6 +163,11 @@
       The radius of corners between the track and the indicator.
     -->
     <attr name="trackInnerCornerRadius" format="dimension|fraction" />
+
+    <!--
+      The padding of the stop indicator in the track.
+    -->
+    <attr name="trackStopIndicatorPadding" format="dimension" />
   </declare-styleable>
 
   <declare-styleable name="CircularProgressIndicator">