Animate state change for Switch (cc2688d1) · Commits · e / os / android_frameworks_base

core/java/android/widget/Switch.java

+87 −27

Original line number	Diff line number	Diff line
		@@ -16,6 +16,7 @@

		package android.widget;

		import android.animation.ObjectAnimator;
		import android.content.Context;
		import android.content.res.ColorStateList;
		import android.content.res.Resources;
		@@ -32,6 +33,8 @@ import android.text.TextUtils;
		import android.text.method.AllCapsTransformationMethod;
		import android.text.method.TransformationMethod2;
		import android.util.AttributeSet;
		import android.util.FloatProperty;
		import android.util.MathUtils;
		import android.view.Gravity;
		import android.view.MotionEvent;
		import android.view.VelocityTracker;
		@@ -66,6 +69,8 @@ import com.android.internal.R;
		* @attr ref android.R.styleable#Switch_track
		*/
		public class Switch extends CompoundButton {
		private static final int THUMB_ANIMATION_DURATION = 250;

		private static final int TOUCH_MODE_IDLE = 0;
		private static final int TOUCH_MODE_DOWN = 1;
		private static final int TOUCH_MODE_DRAGGING = 2;
		@@ -105,6 +110,7 @@ public class Switch extends CompoundButton {
		private Layout mOnLayout;
		private Layout mOffLayout;
		private TransformationMethod2 mSwitchTransformationMethod;
		private ObjectAnimator mPositionAnimator;

		@SuppressWarnings("hiding")
		private final Rect mTempRect = new Rect();
		@@ -550,9 +556,12 @@ public class Switch extends CompoundButton {
		* @return true if (x, y) is within the target area of the switch thumb
		*/
		private boolean hitThumb(float x, float y) {
		// Relies on mTempRect, MUST be called first!
		final int thumbOffset = getThumbOffset();

		mThumbDrawable.getPadding(mTempRect);
		final int thumbTop = mSwitchTop - mTouchSlop;
		final int thumbLeft = mSwitchLeft + (int) (mThumbPosition + 0.5f) - mTouchSlop;
		final int thumbLeft = mSwitchLeft + thumbOffset - mTouchSlop;
		final int thumbRight = thumbLeft + mThumbWidth +
		mTempRect.left + mTempRect.right + mTouchSlop;
		final int thumbBottom = mSwitchBottom + mTouchSlop;
		@@ -597,13 +606,23 @@ public class Switch extends CompoundButton {

		case TOUCH_MODE_DRAGGING: {
		final float x = ev.getX();
		final float dx = x - mTouchX;
		float newPos = Math.max(0,
		Math.min(mThumbPosition + dx, getThumbScrollRange()));
		final int thumbScrollRange = getThumbScrollRange();
		final float thumbScrollOffset = x - mTouchX;
		float dPos;
		if (thumbScrollRange != 0) {
		dPos = thumbScrollOffset / thumbScrollRange;
		} else {
		// If the thumb scroll range is empty, just use the
		// movement direction to snap on or off.
		dPos = thumbScrollOffset > 0 ? 1 : -1;
		}
		if (isLayoutRtl()) {
		dPos = -dPos;
		}
		final float newPos = MathUtils.constrain(mThumbPosition + dPos, 0, 1);
		if (newPos != mThumbPosition) {
		mThumbPosition = newPos;
		mTouchX = x;
		invalidate();
		setThumbPosition(newPos);
		}
		return true;
		}
		@@ -661,41 +680,53 @@ public class Switch extends CompoundButton {
		}

		private void animateThumbToCheckedState(boolean newCheckedState) {
		// TODO animate!
		//float targetPos = newCheckedState ? 0 : getThumbScrollRange();
		//mThumbPosition = targetPos;
		setChecked(newCheckedState);
		super.setChecked(newCheckedState);

		final float targetPosition = newCheckedState ? 1 : 0;
		mPositionAnimator = ObjectAnimator.ofFloat(this, THUMB_POS, targetPosition);
		mPositionAnimator.setDuration(THUMB_ANIMATION_DURATION);
		mPositionAnimator.setAutoCancel(true);
		mPositionAnimator.start();
		}

		private boolean getTargetCheckedState() {
		if (isLayoutRtl()) {
		return mThumbPosition <= getThumbScrollRange() / 2;
		} else {
		return mThumbPosition >= getThumbScrollRange() / 2;
		private void cancelPositionAnimator() {
		if (mPositionAnimator != null) {
		mPositionAnimator.cancel();
		}
		}

		private void setThumbPosition(boolean checked) {
		if (isLayoutRtl()) {
		mThumbPosition = checked ? 0 : getThumbScrollRange();
		} else {
		mThumbPosition = checked ? getThumbScrollRange() : 0;
		private boolean getTargetCheckedState() {
		return mThumbPosition > 0.5f;
		}

		/**
		* Sets the thumb position as a decimal value between 0 (off) and 1 (on).
		*
		* @param position new position between [0,1]
		*/
		private void setThumbPosition(float position) {
		mThumbPosition = position;
		invalidate();
		}

		@Override
		public void toggle() {
		animateThumbToCheckedState(!isChecked());
		}

		@Override
		public void setChecked(boolean checked) {
		super.setChecked(checked);
		setThumbPosition(isChecked());
		invalidate();

		// Immediately move the thumb to the new position.
		cancelPositionAnimator();
		setThumbPosition(checked ? 1 : 0);
		}

		@Override
		protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
		super.onLayout(changed, left, top, right, bottom);

		setThumbPosition(isChecked());

		int switchRight;
		int switchLeft;

		@@ -756,11 +787,12 @@ public class Switch extends CompoundButton {
		int switchInnerBottom = switchBottom - mTempRect.bottom;
		canvas.clipRect(switchInnerLeft, switchTop, switchInnerRight, switchBottom);

		// Relies on mTempRect, MUST be called first!
		final int thumbPos = getThumbOffset();

		mThumbDrawable.getPadding(mTempRect);
		final int thumbPos = (int) (mThumbPosition + 0.5f);
		int thumbLeft = switchInnerLeft - mTempRect.left + thumbPos;
		int thumbRight = switchInnerLeft + thumbPos + mThumbWidth + mTempRect.right;

		mThumbDrawable.setBounds(thumbLeft, switchTop, thumbRight, switchBottom);
		mThumbDrawable.draw(canvas);

		@@ -805,6 +837,22 @@ public class Switch extends CompoundButton {
		return padding;
		}

		/**
		* Translates thumb position to offset according to current RTL setting and
		* thumb scroll range.
		*
		* @return thumb offset
		*/
		private int getThumbOffset() {
		final float thumbPosition;
		if (isLayoutRtl()) {
		thumbPosition = 1 - mThumbPosition;
		} else {
		thumbPosition = mThumbPosition;
		}
		return (int) (thumbPosition * getThumbScrollRange() + 0.5f);
		}

		private int getThumbScrollRange() {
		if (mTrackDrawable == null) {
		return 0;
		@@ -870,4 +918,16 @@ public class Switch extends CompoundButton {
		}
		}
		}

		private static final FloatProperty<Switch> THUMB_POS = new FloatProperty<Switch>("thumbPos") {
		@Override
		public Float get(Switch object) {
		return object.mThumbPosition;
		}

		@Override
		public void setValue(Switch object, float value) {
		object.setThumbPosition(value);
		}
		};
		}