Refactor MagnificationController out to its own class (57525a70) · Commits · e / os / android_frameworks_base

services/accessibility/java/com/android/server/accessibility/AccessibilityManagerService.java

+9 −1

Original line number	Diff line number	Diff line
		@@ -91,7 +91,6 @@ import android.view.accessibility.IAccessibilityManagerClient;
		import com.android.internal.R;
		import com.android.internal.content.PackageMonitor;
		import com.android.internal.statusbar.IStatusBarService;
		import com.android.internal.widget.LockPatternUtils;
		import com.android.server.LocalServices;

		import org.xmlpull.v1.XmlPullParserException;
		@@ -180,6 +179,8 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub {

		private final MainHandler mMainHandler;

		private MagnificationController mMagnificationController;

		private InteractionBridge mInteractionBridge;

		private AlertDialog mEnableTouchExplorationDialog;
		@@ -1936,6 +1937,13 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub {
		}
		}

		MagnificationController getMagnificationController() {
		if (mMagnificationController == null) {
		mMagnificationController = new MagnificationController(mContext, this);
		}
		return mMagnificationController;
		}

		/**
		* This class represents an accessibility service. It stores all per service
		* data required for the service management, provides API for starting/stopping the

services/accessibility/java/com/android/server/accessibility/MagnificationController.java

0 → 100644

+367 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2015 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		package com.android.server.accessibility;

		import com.android.internal.R;
		import com.android.server.LocalServices;

		import android.animation.ObjectAnimator;
		import android.animation.TypeEvaluator;
		import android.animation.ValueAnimator;
		import android.content.Context;
		import android.graphics.Rect;
		import android.graphics.Region;
		import android.util.Property;
		import android.util.Slog;
		import android.view.MagnificationSpec;
		import android.view.WindowManagerInternal;
		import android.view.animation.DecelerateInterpolator;

		/**
		* This class is used to control and query the state of display magnification
		* from the accessibility manager and related classes. It is responsible for
		* holding the current state of magnification and animation, and it handles
		* communication between the accessibility manager and window manager.
		*/
		class MagnificationController {
		private static final String LOG_TAG = ScreenMagnifier.class.getSimpleName();

		private static final boolean DEBUG_SET_MAGNIFICATION_SPEC = false;
		private static final boolean DEBUG_MAGNIFICATION_CONTROLLER = false;

		private static final String PROPERTY_NAME_MAGNIFICATION_SPEC = "magnificationSpec";

		private final MagnificationSpec mSentMagnificationSpec = MagnificationSpec.obtain();
		private final MagnificationSpec mCurrentMagnificationSpec = MagnificationSpec.obtain();

		private final Region mMagnifiedBounds = new Region();
		private final Rect mTempRect = new Rect();

		private final AccessibilityManagerService mAms;
		private final WindowManagerInternal mWindowManager;
		private final ValueAnimator mTransformationAnimator;

		public MagnificationController(Context context, AccessibilityManagerService ams) {
		mAms = ams;
		mWindowManager = LocalServices.getService(WindowManagerInternal.class);

		final Property<MagnificationController, MagnificationSpec> property =
		Property.of(MagnificationController.class, MagnificationSpec.class,
		PROPERTY_NAME_MAGNIFICATION_SPEC);
		final MagnificationSpecEvaluator evaluator = new MagnificationSpecEvaluator();
		final long animationDuration = context.getResources().getInteger(
		R.integer.config_longAnimTime);
		mTransformationAnimator = ObjectAnimator.ofObject(this, property, evaluator,
		mSentMagnificationSpec, mCurrentMagnificationSpec);
		mTransformationAnimator.setDuration(animationDuration);
		mTransformationAnimator.setInterpolator(new DecelerateInterpolator(2.5f));
		}

		/**
		* @return {@code true} if magnification is active, e.g. the scale
		* is > 1, {@code false} otherwise
		*/
		public boolean isMagnifying() {
		return mCurrentMagnificationSpec.scale > 1.0f;
		}

		/**
		* Sets the magnified region.
		*
		* @param region the region to set
		* @param updateSpec {@code true} to update the scale and center based on
		* the region bounds, {@code false} to leave them as-is
		*/
		public void setMagnifiedRegion(Region region, boolean updateSpec) {
		mMagnifiedBounds.set(region);

		if (updateSpec) {
		final Rect magnifiedFrame = mTempRect;
		region.getBounds(magnifiedFrame);
		final float scale = mSentMagnificationSpec.scale;
		final float offsetX = mSentMagnificationSpec.offsetX;
		final float offsetY = mSentMagnificationSpec.offsetY;
		final float centerX = (-offsetX + magnifiedFrame.width() / 2) / scale;
		final float centerY = (-offsetY + magnifiedFrame.height() / 2) / scale;
		setScaleAndMagnifiedRegionCenter(scale, centerX, centerY, false);
		} else {
		mAms.onMagnificationStateChanged();
		}
		}

		/**
		* Returns whether the magnified region contains the specified
		* screen-relative coordinates.
		*
		* @param x the screen-relative X coordinate to check
		* @param y the screen-relative Y coordinate to check
		* @return {@code true} if the coordinate is contained within the
		* magnified region, or {@code false} otherwise
		*/
		public boolean magnifiedRegionContains(float x, float y) {
		return mMagnifiedBounds.contains((int) x, (int) y);
		}

		/**
		* Populates the specified rect with the bounds of the magnified
		* region.
		*
		* @param outBounds rect to populate with the bounds of the magnified
		* region
		*/
		public void getMagnifiedBounds(Rect outBounds) {
		mMagnifiedBounds.getBounds(outBounds);
		}

		/**
		* Returns the magnification scale. If an animation is in progress,
		* this reflects the end state of the animation.
		*
		* @return the scale
		*/
		public float getScale() {
		return mCurrentMagnificationSpec.scale;
		}

		/**
		* Returns the X offset of the magnification viewport. If an animation
		* is in progress, this reflects the end state of the animation.
		*
		* @return the X offset
		*/
		public float getOffsetX() {
		return mCurrentMagnificationSpec.offsetX;
		}

		/**
		* Returns the Y offset of the magnification viewport. If an animation
		* is in progress, this reflects the end state of the animation.
		*
		* @return the Y offset
		*/
		public float getOffsetY() {
		return mCurrentMagnificationSpec.offsetY;
		}

		/**
		* Returns the scale currently used by the window manager. If an
		* animation is in progress, this reflects the current state of the
		* animation.
		*
		* @return the scale currently used by the window manager
		*/
		public float getSentScale() {
		return mSentMagnificationSpec.scale;
		}

		/**
		* Returns the X offset currently used by the window manager. If an
		* animation is in progress, this reflects the current state of the
		* animation.
		*
		* @return the X offset currently used by the window manager
		*/
		public float getSentOffsetX() {
		return mSentMagnificationSpec.offsetX;
		}

		/**
		* Returns the Y offset currently used by the window manager. If an
		* animation is in progress, this reflects the current state of the
		* animation.
		*
		* @return the Y offset currently used by the window manager
		*/
		public float getSentOffsetY() {
		return mSentMagnificationSpec.offsetY;
		}

		/**
		* Resets the magnification scale and center, optionally animating the
		* transition.
		*
		* @param animate {@code true} to animate the transition, {@code false}
		* to transition immediately
		*/
		public void reset(boolean animate) {
		if (mTransformationAnimator.isRunning()) {
		mTransformationAnimator.cancel();
		}
		mCurrentMagnificationSpec.clear();
		if (animate) {
		animateMagnificationSpec(mSentMagnificationSpec,
		mCurrentMagnificationSpec);
		} else {
		setMagnificationSpec(mCurrentMagnificationSpec);
		}
		final Rect bounds = mTempRect;
		bounds.setEmpty();
		mAms.onMagnificationStateChanged();
		}

		/**
		* Scales the magnified region around the specified pivot point,
		* optionally animating the transition. If animation is disabled, the
		* transition is immediate.
		*
		* @param scale the target scale, must be >= 1
		* @param animate {@code true} to animate the transition, {@code false}
		* to transition immediately
		*/
		public void setScale(float scale, float pivotX, float pivotY, boolean animate) {
		final Rect magnifiedFrame = mTempRect;
		mMagnifiedBounds.getBounds(magnifiedFrame);
		final MagnificationSpec spec = mCurrentMagnificationSpec;
		final float oldScale = spec.scale;
		final float oldCenterX = (-spec.offsetX + magnifiedFrame.width() / 2) / oldScale;
		final float oldCenterY = (-spec.offsetY + magnifiedFrame.height() / 2) / oldScale;
		final float normPivotX = (-spec.offsetX + pivotX) / oldScale;
		final float normPivotY = (-spec.offsetY + pivotY) / oldScale;
		final float offsetX = (oldCenterX - normPivotX) * (oldScale / scale);
		final float offsetY = (oldCenterY - normPivotY) * (oldScale / scale);
		final float centerX = normPivotX + offsetX;
		final float centerY = normPivotY + offsetY;
		setScaleAndMagnifiedRegionCenter(scale, centerX, centerY, animate);
		}

		/**
		* Sets the center of the magnified region, optionally animating the
		* transition. If animation is disabled, the transition is immediate.
		*
		* @param centerX the screen-relative X coordinate around which to
		* center
		* @param centerY the screen-relative Y coordinate around which to
		* center
		* @param animate {@code true} to animate the transition, {@code false}
		* to transition immediately
		*/
		public void setMagnifiedRegionCenter(float centerX, float centerY, boolean animate) {
		setScaleAndMagnifiedRegionCenter(mCurrentMagnificationSpec.scale, centerX, centerY,
		animate);
		}

		/**
		* Sets the scale and center of the magnified region, optionally
		* animating the transition. If animation is disabled, the transition
		* is immediate.
		*
		* @param scale the target scale, must be >= 1
		* @param centerX the screen-relative X coordinate around which to
		* center and scale
		* @param centerY the screen-relative Y coordinate around which to
		* center and scale
		* @param animate {@code true} to animate the transition, {@code false}
		* to transition immediately
		*/
		public void setScaleAndMagnifiedRegionCenter(float scale, float centerX, float centerY,
		boolean animate) {
		if (Float.compare(mCurrentMagnificationSpec.scale, scale) == 0
		&& Float.compare(mCurrentMagnificationSpec.offsetX, centerX) == 0
		&& Float.compare(mCurrentMagnificationSpec.offsetY, centerY) == 0) {
		return;
		}
		if (mTransformationAnimator.isRunning()) {
		mTransformationAnimator.cancel();
		}
		if (DEBUG_MAGNIFICATION_CONTROLLER) {
		Slog.i(LOG_TAG, "scale: " + scale + " offsetX: " + centerX + " offsetY: " + centerY);
		}
		updateMagnificationSpec(scale, centerX, centerY);
		if (animate) {
		animateMagnificationSpec(mSentMagnificationSpec,
		mCurrentMagnificationSpec);
		} else {
		setMagnificationSpec(mCurrentMagnificationSpec);
		}
		mAms.onMagnificationStateChanged();
		}

		/**
		* Offsets the center of the magnified region.
		*
		* @param offsetX the amount in pixels to offset the X center
		* @param offsetY the amount in pixels to offset the Y center
		*/
		public void offsetMagnifiedRegionCenter(float offsetX, float offsetY) {
		final float nonNormOffsetX = mCurrentMagnificationSpec.offsetX - offsetX;
		mCurrentMagnificationSpec.offsetX = Math.min(Math.max(nonNormOffsetX,
		getMinOffsetX()), 0);
		final float nonNormOffsetY = mCurrentMagnificationSpec.offsetY - offsetY;
		mCurrentMagnificationSpec.offsetY = Math.min(Math.max(nonNormOffsetY,
		getMinOffsetY()), 0);
		setMagnificationSpec(mCurrentMagnificationSpec);
		}

		private void updateMagnificationSpec(float scale, float magnifiedCenterX,
		float magnifiedCenterY) {
		final Rect magnifiedFrame = mTempRect;
		mMagnifiedBounds.getBounds(magnifiedFrame);
		mCurrentMagnificationSpec.scale = scale;
		final int viewportWidth = magnifiedFrame.width();
		final float nonNormOffsetX = viewportWidth / 2 - magnifiedCenterX * scale;
		mCurrentMagnificationSpec.offsetX = Math.min(Math.max(nonNormOffsetX,
		getMinOffsetX()), 0);
		final int viewportHeight = magnifiedFrame.height();
		final float nonNormOffsetY = viewportHeight / 2 - magnifiedCenterY * scale;
		mCurrentMagnificationSpec.offsetY = Math.min(Math.max(nonNormOffsetY,
		getMinOffsetY()), 0);
		}

		private float getMinOffsetX() {
		final Rect magnifiedFrame = mTempRect;
		mMagnifiedBounds.getBounds(magnifiedFrame);
		final float viewportWidth = magnifiedFrame.width();
		return viewportWidth - viewportWidth * mCurrentMagnificationSpec.scale;
		}

		private float getMinOffsetY() {
		final Rect magnifiedFrame = mTempRect;
		mMagnifiedBounds.getBounds(magnifiedFrame);
		final float viewportHeight = magnifiedFrame.height();
		return viewportHeight - viewportHeight * mCurrentMagnificationSpec.scale;
		}

		private void animateMagnificationSpec(MagnificationSpec fromSpec,
		MagnificationSpec toSpec) {
		mTransformationAnimator.setObjectValues(fromSpec, toSpec);
		mTransformationAnimator.start();
		}

		private void setMagnificationSpec(MagnificationSpec spec) {
		if (DEBUG_SET_MAGNIFICATION_SPEC) {
		Slog.i(LOG_TAG, "Sending: " + spec);
		}
		mSentMagnificationSpec.scale = spec.scale;
		mSentMagnificationSpec.offsetX = spec.offsetX;
		mSentMagnificationSpec.offsetY = spec.offsetY;
		mWindowManager.setMagnificationSpec(MagnificationSpec.obtain(spec));
		}

		private static class MagnificationSpecEvaluator implements TypeEvaluator<MagnificationSpec> {
		private final MagnificationSpec mTempTransformationSpec = MagnificationSpec.obtain();

		@Override
		public MagnificationSpec evaluate(float fraction, MagnificationSpec fromSpec,
		MagnificationSpec toSpec) {
		final MagnificationSpec result = mTempTransformationSpec;
		result.scale = fromSpec.scale + (toSpec.scale - fromSpec.scale) * fraction;
		result.offsetX = fromSpec.offsetX + (toSpec.offsetX - fromSpec.offsetX) * fraction;
		result.offsetY = fromSpec.offsetY + (toSpec.offsetY - fromSpec.offsetY) * fraction;
		return result;
		}
		}
		}

services/accessibility/java/com/android/server/accessibility/ScreenMagnifier.java

+17 −219

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