New stack visualization (026e121b) · Commits · e / os / android_frameworks_base

core/java/android/widget/StackView.java

+55 −37

Original line number	Diff line number	Diff line
		@@ -22,6 +22,7 @@ import android.content.Context;
		import android.graphics.Bitmap;
		import android.graphics.BlurMaskFilter;
		import android.graphics.Canvas;
		import android.graphics.Color;
		import android.graphics.Matrix;
		import android.graphics.Paint;
		import android.graphics.PorterDuff;
		@@ -52,14 +53,17 @@ public class StackView extends AdapterViewAnimator {
		* Default animation parameters
		*/
		private static final int DEFAULT_ANIMATION_DURATION = 400;
		private static final int FADE_IN_ANIMATION_DURATION = 800;
		private static final int MINIMUM_ANIMATION_DURATION = 50;

		/**
		* Parameters effecting the perspective visuals
		*/
		private static float PERSPECTIVE_SHIFT_FACTOR = 0.12f;
		private static final float PERSPECTIVE_SHIFT_FACTOR_Y = 0.1f;
		private static final float PERSPECTIVE_SHIFT_FACTOR_X = 0.1f;

		@SuppressWarnings({"FieldCanBeLocal"})
		private static float PERSPECTIVE_SCALE_FACTOR = 0.35f;
		private static final float PERSPECTIVE_SCALE_FACTOR = 0.f;

		/**
		* Represent the two possible stack modes, one where items slide up, and the other
		@@ -184,7 +188,7 @@ public class StackView extends AdapterViewAnimator {
		* Animate the views between different relative indexes within the {@link AdapterViewAnimator}
		*/
		void animateViewForTransition(int fromIndex, int toIndex, View view) {
		if (fromIndex == -1 && toIndex != 0) {
		if (fromIndex == -1 && toIndex > 0) {
		// Fade item in
		if (view.getAlpha() == 1) {
		view.setAlpha(0);
		@@ -192,7 +196,7 @@ public class StackView extends AdapterViewAnimator {
		view.setVisibility(VISIBLE);

		ObjectAnimator fadeIn = ObjectAnimator.ofFloat(view, "alpha", view.getAlpha(), 1.0f);
		fadeIn.setDuration(DEFAULT_ANIMATION_DURATION);
		fadeIn.setDuration(FADE_IN_ANIMATION_DURATION);
		fadeIn.start();
		} else if (fromIndex == 0 && toIndex == 1) {
		// Slide item in
		@@ -239,12 +243,46 @@ public class StackView extends AdapterViewAnimator {
		}
		}

		private void transformViewAtIndex(int index, View view) {
		float maxPerspectiveShiftY = getMeasuredHeight() * PERSPECTIVE_SHIFT_FACTOR_Y;
		float maxPerspectiveShiftX = getMeasuredHeight() * PERSPECTIVE_SHIFT_FACTOR_X;

		index = mMaxNumActiveViews - index - 1;
		if (index == mMaxNumActiveViews - 1) index--;

		float r = (index * 1.0f) / (mMaxNumActiveViews - 2);

		float scale = 1 - PERSPECTIVE_SCALE_FACTOR * (1 - r);
		PropertyValuesHolder scalePropX = PropertyValuesHolder.ofFloat("scaleX", scale);
		PropertyValuesHolder scalePropY = PropertyValuesHolder.ofFloat("scaleY", scale);

		int stackDirection = (mStackMode == ITEMS_SLIDE_UP) ? 1 : -1;
		float perspectiveTranslationY = -stackDirection * r * maxPerspectiveShiftY;
		float scaleShiftCorrectionY = stackDirection * (1 - scale) *
		(getMeasuredHeight() * (1 - PERSPECTIVE_SHIFT_FACTOR_Y) / 2.0f);
		float transY = perspectiveTranslationY + scaleShiftCorrectionY;

		float perspectiveTranslationX = (1 - r) * maxPerspectiveShiftX;
		float scaleShiftCorrectionX = (1 - scale) *
		(getMeasuredWidth() * (1 - PERSPECTIVE_SHIFT_FACTOR_X) / 2.0f);
		float transX = perspectiveTranslationX + scaleShiftCorrectionX;

		PropertyValuesHolder translationX = PropertyValuesHolder.ofFloat("translationX", transX);
		PropertyValuesHolder translationY = PropertyValuesHolder.ofFloat("translationY", transY);

		ObjectAnimator pa = ObjectAnimator.ofPropertyValuesHolder(view, scalePropX, scalePropY,
		translationY, translationX);
		pa.setDuration(100);
		pa.start();
		}

		private void setupStackSlider(View v, int mode) {
		mStackSlider.setMode(mode);
		if (v != null) {
		mHighlight.setImageBitmap(sHolographicHelper.createOutline(v));
		mHighlight.setRotation(v.getRotation());
		mHighlight.setTranslationY(v.getTranslationY());
		mHighlight.setTranslationX(v.getTranslationX());
		mHighlight.bringToFront();
		v.bringToFront();
		mStackSlider.setView(v);
		@@ -283,32 +321,6 @@ public class StackView extends AdapterViewAnimator {
		super.showPrevious();
		}

		private void transformViewAtIndex(int index, View view) {
		float maxPerpectiveShift = getMeasuredHeight() * PERSPECTIVE_SHIFT_FACTOR;

		index = mMaxNumActiveViews - index - 1;
		if (index == mMaxNumActiveViews - 1) index--;

		float r = (index * 1.0f) / (mMaxNumActiveViews - 2);

		float scale = 1 - PERSPECTIVE_SCALE_FACTOR * (1 - r);
		PropertyValuesHolder scaleX = PropertyValuesHolder.ofFloat("scaleX", scale);
		PropertyValuesHolder scaleY = PropertyValuesHolder.ofFloat("scaleY", scale);

		r = (float) Math.pow(r, 2);

		int stackDirection = (mStackMode == ITEMS_SLIDE_UP) ? 1 : -1;
		float perspectiveTranslation = -stackDirection * r * maxPerpectiveShift;
		float scaleShiftCorrection = stackDirection * (1 - scale) *
		(getMeasuredHeight() * (1 - PERSPECTIVE_SHIFT_FACTOR) / 2.0f);
		float transY = perspectiveTranslation + scaleShiftCorrection;

		PropertyValuesHolder translationY = PropertyValuesHolder.ofFloat("translationY", transY);
		ObjectAnimator pa = ObjectAnimator.ofPropertyValuesHolder(view, scaleX, scaleY, translationY);
		pa.setDuration(100);
		pa.start();
		}

		@Override
		void showOnly(int childIndex, boolean animate, boolean onLayout) {
		super.showOnly(childIndex, animate, onLayout);
		@@ -910,8 +922,9 @@ public class StackView extends AdapterViewAnimator {

		private void measureChildren() {
		final int count = getChildCount();
		final int childWidth = getMeasuredWidth() - mPaddingLeft - mPaddingRight;
		final int childHeight = Math.round(getMeasuredHeight()*(1-PERSPECTIVE_SHIFT_FACTOR))
		final int childWidth = Math.round(getMeasuredWidth()*(1-PERSPECTIVE_SHIFT_FACTOR_X))
		- mPaddingLeft - mPaddingRight;
		final int childHeight = Math.round(getMeasuredHeight()*(1-PERSPECTIVE_SHIFT_FACTOR_Y))
		- mPaddingTop - mPaddingBottom;

		for (int i = 0; i < count; i++) {
		@@ -932,14 +945,14 @@ public class StackView extends AdapterViewAnimator {

		// We need to deal with the case where our parent hasn't told us how
		// big we should be. In this case we should
		float factor = 1/(1 - PERSPECTIVE_SHIFT_FACTOR);
		float factorY = 1/(1 - PERSPECTIVE_SHIFT_FACTOR_Y);
		if (heightSpecMode == MeasureSpec.UNSPECIFIED) {
		heightSpecSize = haveChildRefSize ?
		Math.round(mReferenceChildHeight * (1 + factor)) +
		Math.round(mReferenceChildHeight * (1 + factorY)) +
		mPaddingTop + mPaddingBottom : 0;
		} else if (heightSpecMode == MeasureSpec.AT_MOST) {
		if (haveChildRefSize) {
		int height = Math.round(mReferenceChildHeight * (1 + factor))
		int height = Math.round(mReferenceChildHeight * (1 + factorY))
		+ mPaddingTop + mPaddingBottom;
		if (height <= heightSpecSize) {
		heightSpecSize = height;
		@@ -951,9 +964,11 @@ public class StackView extends AdapterViewAnimator {
		}
		}

		float factorX = 1/(1 - PERSPECTIVE_SHIFT_FACTOR_X);
		if (widthSpecMode == MeasureSpec.UNSPECIFIED) {
		widthSpecSize = haveChildRefSize ? mReferenceChildWidth + mPaddingLeft +
		mPaddingRight : 0;
		widthSpecSize = haveChildRefSize ?
		Math.round(mReferenceChildWidth * (1 + factorX)) +
		mPaddingLeft + mPaddingRight : 0;
		} else if (heightSpecMode == MeasureSpec.AT_MOST) {
		if (haveChildRefSize) {
		int width = mReferenceChildWidth + mPaddingLeft + mPaddingRight;
		@@ -1122,13 +1137,16 @@ public class StackView extends AdapterViewAnimator {
		float rotationX = v.getRotationX();
		float rotation = v.getRotation();
		float translationY = v.getTranslationY();
		float translationX = v.getTranslationX();
		v.setRotationX(0);
		v.setRotation(0);
		v.setTranslationY(0);
		v.setTranslationX(0);
		v.draw(mCanvas);
		v.setRotationX(rotationX);
		v.setRotation(rotation);
		v.setTranslationY(translationY);
		v.setTranslationX(translationX);

		drawOutline(mCanvas, bitmap);
		return bitmap;