Merge "Setting transparency for clear-all button." into ub-launcher3-edmonton (152464db) · Commits · e / os / android_packages_apps_Trebuchet

quickstep/src/com/android/quickstep/fallback/FallbackRecentsView.java

+0 −1

Original line number	Diff line number	Diff line
		@@ -35,7 +35,6 @@ public class FallbackRecentsView extends RecentsView<RecentsActivity> {
		public FallbackRecentsView(Context context, AttributeSet attrs, int defStyleAttr) {
		super(context, attrs, defStyleAttr);
		setOverviewStateEnabled(true);
		updateEmptyMessage();
		}

		@Override

quickstep/src/com/android/quickstep/views/RecentsView.java

+55 −0

Original line number	Diff line number	Diff line
		@@ -213,6 +213,7 @@ public abstract class RecentsView<T extends BaseActivity>
		mEmptyMessagePadding = getResources()
		.getDimensionPixelSize(R.dimen.recents_empty_message_text_padding);
		setWillNotDraw(false);
		updateEmptyMessage();
		}

		@Override
		@@ -310,6 +311,56 @@ public abstract class RecentsView<T extends BaseActivity>
		}
		}

		private float calculateClearAllButtonAlpha() {
		if (mClearAllButton.getVisibility() != View.VISIBLE) return 0;

		// Current visible coordinate of the right border of the rightmost task.
		final int carouselCurrentRight = getChildAt(getChildCount() - 1).getRight() - getScrollX();

		// As the right border (let's call it E aka carouselCurrentRight) of the carousel moves
		// over Clear all button, the button changes trasparency.
		// leftOfAlphaChange < rightOfAlphaChange; these are the points of the 100% and 0% alpha
		// correspondingly. Alpha changes linearly between 100% and 0% as E moves through this
		// range. It doesn't change outside of the range.

		// Once E hits the left border of the Clear-All button, the whole button is uncovered,
		// and it should have alpha 100%.
		final float leftOfAlphaChange = mClearAllButton.getX();

		// The rightmost possible right coordinate of the carousel.
		final int carouselMotionLimit = getScrollForPage(getChildCount() - 1) + getWidth()
		- getPaddingRight() - mInsets.right;

		// The carousel might not be able to ever cover a part of the Clear-all button. Then
		// always show the button as 100%. Technically, this check also prevents dividing by zero
		// or a negative number when calculating the transparency ratio below.
		if (carouselMotionLimit <= leftOfAlphaChange) return 1;

		// If the carousel is able to cover the button completely, we make the button completely
		// transparent when E hits the right border of the button.
		// Or, the carousel may not be able to move that far to the right so it completely covers
		// the button. Then we set the rightmost possible position of the carousel as the point
		// where the button reaches 0 alpha.
		final float rightOfAlphaChange = Math.min(
		mClearAllButton.getX() + mClearAllButton.getWidth(), carouselMotionLimit);

		return Utilities.boundToRange(
		(rightOfAlphaChange - carouselCurrentRight) /
		(rightOfAlphaChange - leftOfAlphaChange), 0, 1);
		}

		private void updateClearAllButtonAlpha() {
		if (mClearAllButton != null) {
		mClearAllButton.setAlpha(calculateClearAllButtonAlpha() * mContentAlpha);
		}
		}

		@Override
		protected void onScrollChanged(int l, int t, int oldl, int oldt) {
		super.onScrollChanged(l, t, oldl, oldt);
		updateClearAllButtonAlpha();
		}

		@Override
		public boolean onTouchEvent(MotionEvent ev) {
		if (DEBUG_SHOW_CLEAR_ALL_BUTTON && ev.getAction() == MotionEvent.ACTION_DOWN
		@@ -864,6 +915,7 @@ public abstract class RecentsView<T extends BaseActivity>
		int alphaInt = Math.round(alpha * 255);
		mEmptyMessagePaint.setAlpha(alphaInt);
		mEmptyIcon.setAlpha(alphaInt);
		updateClearAllButtonAlpha();
		}

		public void setAdjacentScale(float adjacentScale) {
		@@ -948,6 +1000,7 @@ public abstract class RecentsView<T extends BaseActivity>
		mEmptyTextLayout = null;
		mLastMeasureSize.set(getWidth(), getHeight());
		}
		updateClearAllButtonVisibility();

		if (!mShowEmptyMessage) return;

		@@ -1140,8 +1193,10 @@ public abstract class RecentsView<T extends BaseActivity>
		}

		private void updateClearAllButtonVisibility() {
		if (mClearAllButton == null) return;
		mClearAllButton.setVisibility(
		!DEBUG_SHOW_CLEAR_ALL_BUTTON \|\| mShowEmptyMessage ? GONE : VISIBLE);
		updateClearAllButtonAlpha();
		}

		public void setClearAllButton(View clearAllButton) {