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-rw-r--r--core/java/android/view/View.java102
-rw-r--r--core/java/android/view/ViewConfiguration.java17
-rw-r--r--core/res/res/values/config.xml3
-rw-r--r--core/res/res/values/symbols.xml1
4 files changed, 101 insertions, 22 deletions
diff --git a/core/java/android/view/View.java b/core/java/android/view/View.java
index d46811753e39..0c6d9e318a99 100644
--- a/core/java/android/view/View.java
+++ b/core/java/android/view/View.java
@@ -5386,16 +5386,16 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
x += getScrollX();
y += getScrollY();
if (isVerticalScrollBarEnabled() && !isVerticalScrollBarHidden()) {
- final Rect bounds = mScrollCache.mScrollBarBounds;
- getVerticalScrollBarBounds(bounds);
- if (bounds.contains((int)x, (int)y)) {
+ final Rect touchBounds = mScrollCache.mScrollBarTouchBounds;
+ getVerticalScrollBarBounds(null, touchBounds);
+ if (touchBounds.contains((int) x, (int) y)) {
return true;
}
}
if (isHorizontalScrollBarEnabled()) {
- final Rect bounds = mScrollCache.mScrollBarBounds;
- getHorizontalScrollBarBounds(bounds);
- if (bounds.contains((int)x, (int)y)) {
+ final Rect touchBounds = mScrollCache.mScrollBarTouchBounds;
+ getHorizontalScrollBarBounds(null, touchBounds);
+ if (touchBounds.contains((int) x, (int) y)) {
return true;
}
}
@@ -5414,7 +5414,8 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
x += getScrollX();
y += getScrollY();
final Rect bounds = mScrollCache.mScrollBarBounds;
- getVerticalScrollBarBounds(bounds);
+ final Rect touchBounds = mScrollCache.mScrollBarTouchBounds;
+ getVerticalScrollBarBounds(bounds, touchBounds);
final int range = computeVerticalScrollRange();
final int offset = computeVerticalScrollOffset();
final int extent = computeVerticalScrollExtent();
@@ -5423,8 +5424,9 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
final int thumbOffset = ScrollBarUtils.getThumbOffset(bounds.height(), thumbLength,
extent, range, offset);
final int thumbTop = bounds.top + thumbOffset;
- if (x >= bounds.left && x <= bounds.right && y >= thumbTop
- && y <= thumbTop + thumbLength) {
+ final int adjust = Math.max(mScrollCache.scrollBarMinTouchTarget - thumbLength, 0) / 2;
+ if (x >= touchBounds.left && x <= touchBounds.right
+ && y >= thumbTop - adjust && y <= thumbTop + thumbLength + adjust) {
return true;
}
}
@@ -5439,7 +5441,8 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
x += getScrollX();
y += getScrollY();
final Rect bounds = mScrollCache.mScrollBarBounds;
- getHorizontalScrollBarBounds(bounds);
+ final Rect touchBounds = mScrollCache.mScrollBarTouchBounds;
+ getHorizontalScrollBarBounds(bounds, touchBounds);
final int range = computeHorizontalScrollRange();
final int offset = computeHorizontalScrollOffset();
final int extent = computeHorizontalScrollExtent();
@@ -5448,8 +5451,9 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
final int thumbOffset = ScrollBarUtils.getThumbOffset(bounds.width(), thumbLength,
extent, range, offset);
final int thumbLeft = bounds.left + thumbOffset;
- if (x >= thumbLeft && x <= thumbLeft + thumbLength && y >= bounds.top
- && y <= bounds.bottom) {
+ final int adjust = Math.max(mScrollCache.scrollBarMinTouchTarget - thumbLength, 0) / 2;
+ if (x >= thumbLeft - adjust && x <= thumbLeft + thumbLength + adjust
+ && y >= touchBounds.top && y <= touchBounds.bottom) {
return true;
}
}
@@ -11752,7 +11756,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
if (mScrollCache.mScrollBarDraggingState
== ScrollabilityCache.DRAGGING_VERTICAL_SCROLL_BAR) {
final Rect bounds = mScrollCache.mScrollBarBounds;
- getVerticalScrollBarBounds(bounds);
+ getVerticalScrollBarBounds(bounds, null);
final int range = computeVerticalScrollRange();
final int offset = computeVerticalScrollOffset();
final int extent = computeVerticalScrollExtent();
@@ -11781,7 +11785,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
if (mScrollCache.mScrollBarDraggingState
== ScrollabilityCache.DRAGGING_HORIZONTAL_SCROLL_BAR) {
final Rect bounds = mScrollCache.mScrollBarBounds;
- getHorizontalScrollBarBounds(bounds);
+ getHorizontalScrollBarBounds(bounds, null);
final int range = computeHorizontalScrollRange();
final int offset = computeHorizontalScrollOffset();
final int extent = computeHorizontalScrollExtent();
@@ -15488,7 +15492,12 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
}
}
- private void getHorizontalScrollBarBounds(Rect bounds) {
+ private void getHorizontalScrollBarBounds(@Nullable Rect drawBounds,
+ @Nullable Rect touchBounds) {
+ final Rect bounds = drawBounds != null ? drawBounds : touchBounds;
+ if (bounds == null) {
+ return;
+ }
final int inside = (mViewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0;
final boolean drawVerticalScrollBar = isVerticalScrollBarEnabled()
&& !isVerticalScrollBarHidden();
@@ -15501,13 +15510,31 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
bounds.left = mScrollX + (mPaddingLeft & inside);
bounds.right = mScrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap;
bounds.bottom = bounds.top + size;
+
+ if (touchBounds == null) {
+ return;
+ }
+ if (touchBounds != bounds) {
+ touchBounds.set(bounds);
+ }
+ final int minTouchTarget = mScrollCache.scrollBarMinTouchTarget;
+ if (touchBounds.height() < minTouchTarget) {
+ final int adjust = (minTouchTarget - touchBounds.height()) / 2;
+ touchBounds.bottom = Math.min(touchBounds.bottom + adjust, mScrollY + height);
+ touchBounds.top = touchBounds.bottom - minTouchTarget;
+ }
+ if (touchBounds.width() < minTouchTarget) {
+ final int adjust = (minTouchTarget - touchBounds.width()) / 2;
+ touchBounds.left -= adjust;
+ touchBounds.right = touchBounds.left + minTouchTarget;
+ }
}
- private void getVerticalScrollBarBounds(Rect bounds) {
+ private void getVerticalScrollBarBounds(@Nullable Rect bounds, @Nullable Rect touchBounds) {
if (mRoundScrollbarRenderer == null) {
- getStraightVerticalScrollBarBounds(bounds);
+ getStraightVerticalScrollBarBounds(bounds, touchBounds);
} else {
- getRoundVerticalScrollBarBounds(bounds);
+ getRoundVerticalScrollBarBounds(bounds != null ? bounds : touchBounds);
}
}
@@ -15522,7 +15549,12 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
bounds.bottom = mScrollY + height;
}
- private void getStraightVerticalScrollBarBounds(Rect bounds) {
+ private void getStraightVerticalScrollBarBounds(@Nullable Rect drawBounds,
+ @Nullable Rect touchBounds) {
+ final Rect bounds = drawBounds != null ? drawBounds : touchBounds;
+ if (bounds == null) {
+ return;
+ }
final int inside = (mViewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0;
final int size = getVerticalScrollbarWidth();
int verticalScrollbarPosition = mVerticalScrollbarPosition;
@@ -15544,6 +15576,29 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
bounds.top = mScrollY + (mPaddingTop & inside);
bounds.right = bounds.left + size;
bounds.bottom = mScrollY + height - (mUserPaddingBottom & inside);
+
+ if (touchBounds == null) {
+ return;
+ }
+ if (touchBounds != bounds) {
+ touchBounds.set(bounds);
+ }
+ final int minTouchTarget = mScrollCache.scrollBarMinTouchTarget;
+ if (touchBounds.width() < minTouchTarget) {
+ final int adjust = (minTouchTarget - touchBounds.width()) / 2;
+ if (verticalScrollbarPosition == SCROLLBAR_POSITION_RIGHT) {
+ touchBounds.right = Math.min(touchBounds.right + adjust, mScrollX + width);
+ touchBounds.left = touchBounds.right - minTouchTarget;
+ } else {
+ touchBounds.left = Math.max(touchBounds.left + adjust, mScrollX);
+ touchBounds.right = touchBounds.left + minTouchTarget;
+ }
+ }
+ if (touchBounds.height() < minTouchTarget) {
+ final int adjust = (minTouchTarget - touchBounds.height()) / 2;
+ touchBounds.top -= adjust;
+ touchBounds.bottom = touchBounds.top + minTouchTarget;
+ }
}
/**
@@ -15602,7 +15657,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
if (mRoundScrollbarRenderer != null) {
if (drawVerticalScrollBar) {
final Rect bounds = cache.mScrollBarBounds;
- getVerticalScrollBarBounds(bounds);
+ getVerticalScrollBarBounds(bounds, null);
mRoundScrollbarRenderer.drawRoundScrollbars(
canvas, (float) cache.scrollBar.getAlpha() / 255f, bounds);
if (invalidate) {
@@ -15618,7 +15673,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
computeHorizontalScrollOffset(),
computeHorizontalScrollExtent(), false);
final Rect bounds = cache.mScrollBarBounds;
- getHorizontalScrollBarBounds(bounds);
+ getHorizontalScrollBarBounds(bounds, null);
onDrawHorizontalScrollBar(canvas, scrollBar, bounds.left, bounds.top,
bounds.right, bounds.bottom);
if (invalidate) {
@@ -15631,7 +15686,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
computeVerticalScrollOffset(),
computeVerticalScrollExtent(), true);
final Rect bounds = cache.mScrollBarBounds;
- getVerticalScrollBarBounds(bounds);
+ getVerticalScrollBarBounds(bounds, null);
onDrawVerticalScrollBar(canvas, scrollBar, bounds.left, bounds.top,
bounds.right, bounds.bottom);
if (invalidate) {
@@ -24123,6 +24178,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
public int scrollBarFadeDuration;
public int scrollBarSize;
+ public int scrollBarMinTouchTarget;
public ScrollBarDrawable scrollBar;
public float[] interpolatorValues;
public View host;
@@ -24151,6 +24207,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
private int mLastColor;
public final Rect mScrollBarBounds = new Rect();
+ public final Rect mScrollBarTouchBounds = new Rect();
public static final int NOT_DRAGGING = 0;
public static final int DRAGGING_VERTICAL_SCROLL_BAR = 1;
@@ -24162,6 +24219,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
public ScrollabilityCache(ViewConfiguration configuration, View host) {
fadingEdgeLength = configuration.getScaledFadingEdgeLength();
scrollBarSize = configuration.getScaledScrollBarSize();
+ scrollBarMinTouchTarget = configuration.getScaledMinScrollbarTouchTarget();
scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay();
scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration();
diff --git a/core/java/android/view/ViewConfiguration.java b/core/java/android/view/ViewConfiguration.java
index 0e753f39535d..5d01b4162c6f 100644
--- a/core/java/android/view/ViewConfiguration.java
+++ b/core/java/android/view/ViewConfiguration.java
@@ -156,6 +156,11 @@ public class ViewConfiguration {
private static final int TOUCH_SLOP = 8;
/**
+ * Defines the minimum size of the touch target for a scrollbar in dips
+ */
+ private static final int MIN_SCROLLBAR_TOUCH_TARGET = 48;
+
+ /**
* Distance the first touch can wander before we stop considering this event a double tap
* (in dips)
*/
@@ -274,6 +279,7 @@ public class ViewConfiguration {
private final int mMaximumFlingVelocity;
private final int mScrollbarSize;
private final int mTouchSlop;
+ private final int mMinScrollbarTouchTarget;
private final int mDoubleTapTouchSlop;
private final int mPagingTouchSlop;
private final int mDoubleTapSlop;
@@ -302,6 +308,7 @@ public class ViewConfiguration {
mMaximumFlingVelocity = MAXIMUM_FLING_VELOCITY;
mScrollbarSize = SCROLL_BAR_SIZE;
mTouchSlop = TOUCH_SLOP;
+ mMinScrollbarTouchTarget = MIN_SCROLLBAR_TOUCH_TARGET;
mDoubleTapTouchSlop = DOUBLE_TAP_TOUCH_SLOP;
mPagingTouchSlop = PAGING_TOUCH_SLOP;
mDoubleTapSlop = DOUBLE_TAP_SLOP;
@@ -386,6 +393,8 @@ public class ViewConfiguration {
com.android.internal.R.bool.config_ui_enableFadingMarquee);
mTouchSlop = res.getDimensionPixelSize(
com.android.internal.R.dimen.config_viewConfigurationTouchSlop);
+ mMinScrollbarTouchTarget = res.getDimensionPixelSize(
+ com.android.internal.R.dimen.config_minScrollbarTouchTarget);
mPagingTouchSlop = mTouchSlop * 2;
mDoubleTapTouchSlop = mTouchSlop;
@@ -440,6 +449,14 @@ public class ViewConfiguration {
}
/**
+ * @return the minimum size of the scrollbar thumb's touch target in pixels
+ * @hide
+ */
+ public int getScaledMinScrollbarTouchTarget() {
+ return mMinScrollbarTouchTarget;
+ }
+
+ /**
* @return Duration of the fade when scrollbars fade away in milliseconds
*/
public static int getScrollBarFadeDuration() {
diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
index 581537d8dfa8..54c392f6eb2d 100644
--- a/core/res/res/values/config.xml
+++ b/core/res/res/values/config.xml
@@ -1847,6 +1847,9 @@
-->
<fraction name="config_maximumScreenDimRatio">20%</fraction>
+ <!-- Minimum size of the scrollbar thumb's touch target. -->
+ <dimen name="config_minScrollbarTouchTarget">48dp</dimen>
+
<!-- Base "touch slop" value used by ViewConfiguration as a
movement threshold where scrolling should begin. -->
<dimen name="config_viewConfigurationTouchSlop">8dp</dimen>
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index f72906d25bc9..1324e383618d 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -423,6 +423,7 @@
<java-symbol type="dimen" name="accessibility_touch_slop" />
<java-symbol type="dimen" name="alert_dialog_round_padding"/>
+ <java-symbol type="dimen" name="config_minScrollbarTouchTarget" />
<java-symbol type="dimen" name="config_prefDialogWidth" />
<java-symbol type="dimen" name="config_viewConfigurationTouchSlop" />
<java-symbol type="dimen" name="config_viewMinFlingVelocity" />
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2025-10-31 18:53:33 +0000