import android.view.ContextThemeWrapper;
import android.view.Display;
import android.view.DisplayListCanvas;
-import android.view.LayoutInflater;
import android.view.PixelCopy;
import android.view.RenderNode;
import android.view.Surface;
private final int[] mViewCoordinatesInSurface;
// The window containing the magnifier.
private InternalPopupWindow mWindow;
- // The center coordinates of the window containing the magnifier.
- private final Point mWindowCoords = new Point();
// The width of the window containing the magnifier.
private final int mWindowWidth;
// The height of the window containing the magnifier.
private final float mWindowElevation;
// The corner radius of the window containing the magnifier.
private final float mWindowCornerRadius;
- // The center coordinates of the content that is to be magnified.
+ // The parent surface for the magnifier surface.
+ private SurfaceInfo mParentSurface;
+ // The surface where the content will be copied from.
+ private SurfaceInfo mContentCopySurface;
+ // The center coordinates of the window containing the magnifier.
+ private final Point mWindowCoords = new Point();
+ // The center coordinates of the content to be magnified,
+ // which can potentially contain a region outside the magnified view.
private final Point mCenterZoomCoords = new Point();
+ // The center coordinates of the content to be magnified,
+ // clamped inside the visible region of the magnified view.
+ private final Point mClampedCenterZoomCoords = new Point();
// Variables holding previous states, used for detecting redundant calls and invalidation.
private final Point mPrevStartCoordsInSurface = new Point(
NONEXISTENT_PREVIOUS_CONFIG_VALUE, NONEXISTENT_PREVIOUS_CONFIG_VALUE);
public Magnifier(@NonNull View view) {
mView = Preconditions.checkNotNull(view);
final Context context = mView.getContext();
- final View content = LayoutInflater.from(context).inflate(R.layout.magnifier, null);
- content.findViewById(R.id.magnifier_inner).setClipToOutline(true);
mWindowWidth = context.getResources().getDimensionPixelSize(R.dimen.magnifier_width);
mWindowHeight = context.getResources().getDimensionPixelSize(R.dimen.magnifier_height);
mWindowElevation = context.getResources().getDimension(R.dimen.magnifier_elevation);
xPosInView = Math.max(0, Math.min(xPosInView, mView.getWidth()));
yPosInView = Math.max(0, Math.min(yPosInView, mView.getHeight()));
- configureCoordinates(xPosInView, yPosInView);
-
- // Clamp the startX location to avoid magnifying content which does not belong
- // to the magnified view. This will not take into account overlapping views.
- final Rect viewVisibleRegion = new Rect();
- mView.getGlobalVisibleRect(viewVisibleRegion);
- if (mView.getViewRootImpl() != null) {
- // Clamping coordinates relative to the surface, not to the window.
- final Rect surfaceInsets = mView.getViewRootImpl().mWindowAttributes.surfaceInsets;
- viewVisibleRegion.offset(surfaceInsets.left, surfaceInsets.top);
- }
- if (mView instanceof SurfaceView) {
- // If we copy content from a SurfaceView, clamp coordinates relative to it.
- viewVisibleRegion.offset(-mViewCoordinatesInSurface[0], -mViewCoordinatesInSurface[1]);
- }
- final int startX = Math.max(viewVisibleRegion.left, Math.min(
- mCenterZoomCoords.x - mBitmapWidth / 2,
- viewVisibleRegion.right - mBitmapWidth));
- final int startY = mCenterZoomCoords.y - mBitmapHeight / 2;
+ obtainSurfaces();
+ obtainContentCoordinates(xPosInView, yPosInView);
+ obtainWindowCoordinates();
+ final int startX = mClampedCenterZoomCoords.x - mBitmapWidth / 2;
+ final int startY = mClampedCenterZoomCoords.y - mBitmapHeight / 2;
if (xPosInView != mPrevPosInView.x || yPosInView != mPrevPosInView.y) {
if (mWindow == null) {
synchronized (mLock) {
mWindow = new InternalPopupWindow(mView.getContext(), mView.getDisplay(),
- getValidParentSurfaceForMagnifier(),
+ mParentSurface.mSurface,
mWindowWidth, mWindowHeight, mWindowElevation, mWindowCornerRadius,
Handler.getMain() /* draw the magnifier on the UI thread */, mLock,
mCallback);
*/
public void update() {
if (mWindow != null) {
+ obtainSurfaces();
// Update the content shown in the magnifier.
performPixelCopy(mPrevStartCoordsInSurface.x, mPrevStartCoordsInSurface.y,
false /* update window position */);
mWindow.mLastDrawContentPositionY - surfaceInsets.top);
}
- @Nullable
- private Surface getValidParentSurfaceForMagnifier() {
+ /**
+ * Retrieves the surfaces used by the magnifier:
+ * - a parent surface for the magnifier surface. This will usually be the main app window.
+ * - a surface where the magnified content will be copied from. This will be the main app
+ * window unless the magnified view is a SurfaceView, in which case its backing surface
+ * will be used.
+ */
+ private void obtainSurfaces() {
+ // Get the main window surface.
+ SurfaceInfo validMainWindowSurface = SurfaceInfo.NULL;
if (mView.getViewRootImpl() != null) {
- final Surface mainWindowSurface = mView.getViewRootImpl().mSurface;
+ final ViewRootImpl viewRootImpl = mView.getViewRootImpl();
+ final Surface mainWindowSurface = viewRootImpl.mSurface;
if (mainWindowSurface != null && mainWindowSurface.isValid()) {
- return mainWindowSurface;
+ final Rect surfaceInsets = viewRootImpl.mWindowAttributes.surfaceInsets;
+ final int surfaceWidth =
+ viewRootImpl.getWidth() + surfaceInsets.left + surfaceInsets.right;
+ final int surfaceHeight =
+ viewRootImpl.getHeight() + surfaceInsets.top + surfaceInsets.bottom;
+ validMainWindowSurface =
+ new SurfaceInfo(mainWindowSurface, surfaceWidth, surfaceHeight, true);
}
}
+ // Get the surface backing the magnified view, if it is a SurfaceView.
+ SurfaceInfo validSurfaceViewSurface = SurfaceInfo.NULL;
if (mView instanceof SurfaceView) {
- final Surface surfaceViewSurface = ((SurfaceView) mView).getHolder().getSurface();
+ final SurfaceHolder surfaceHolder = ((SurfaceView) mView).getHolder();
+ final Surface surfaceViewSurface = surfaceHolder.getSurface();
if (surfaceViewSurface != null && surfaceViewSurface.isValid()) {
- return surfaceViewSurface;
+ final Rect surfaceFrame = surfaceHolder.getSurfaceFrame();
+ validSurfaceViewSurface = new SurfaceInfo(surfaceViewSurface,
+ surfaceFrame.right, surfaceFrame.bottom, false);
}
}
- return null;
+
+ // Choose the parent surface for the magnifier and the source surface for the content.
+ mParentSurface = validMainWindowSurface != SurfaceInfo.NULL
+ ? validMainWindowSurface : validSurfaceViewSurface;
+ mContentCopySurface = mView instanceof SurfaceView
+ ? validSurfaceViewSurface : validMainWindowSurface;
}
- private void configureCoordinates(final float xPosInView, final float yPosInView) {
- // Compute the coordinates of the center of the content going to be displayed in the
- // magnifier. These are relative to the surface the content is copied from.
+ /**
+ * Computes the coordinates of the center of the content going to be displayed in the
+ * magnifier. These are relative to the surface the content is copied from.
+ */
+ private void obtainContentCoordinates(final float xPosInView, final float yPosInView) {
final float posX;
final float posY;
mView.getLocationInSurface(mViewCoordinatesInSurface);
mCenterZoomCoords.x = Math.round(posX);
mCenterZoomCoords.y = Math.round(posY);
+ // Clamp the x location to avoid magnifying content which does not belong
+ // to the magnified view. This will not take into account overlapping views.
+ final Rect viewVisibleRegion = new Rect();
+ mView.getGlobalVisibleRect(viewVisibleRegion);
+ if (mView.getViewRootImpl() != null) {
+ // Clamping coordinates relative to the surface, not to the window.
+ final Rect surfaceInsets = mView.getViewRootImpl().mWindowAttributes.surfaceInsets;
+ viewVisibleRegion.offset(surfaceInsets.left, surfaceInsets.top);
+ }
+ if (mView instanceof SurfaceView) {
+ // If we copy content from a SurfaceView, clamp coordinates relative to it.
+ viewVisibleRegion.offset(-mViewCoordinatesInSurface[0], -mViewCoordinatesInSurface[1]);
+ }
+ mClampedCenterZoomCoords.x = Math.max(viewVisibleRegion.left + mBitmapWidth / 2, Math.min(
+ mCenterZoomCoords.x, viewVisibleRegion.right - mBitmapWidth / 2));
+ mClampedCenterZoomCoords.y = mCenterZoomCoords.y;
+ }
+
+ private void obtainWindowCoordinates() {
// Compute the position of the magnifier window. Again, this has to be relative to the
// surface of the magnified view, as this surface is the parent of the magnifier surface.
final int verticalOffset = mView.getContext().getResources().getDimensionPixelSize(
R.dimen.magnifier_offset);
mWindowCoords.x = mCenterZoomCoords.x - mWindowWidth / 2;
mWindowCoords.y = mCenterZoomCoords.y - mWindowHeight / 2 - verticalOffset;
- if (mView instanceof SurfaceView && mView.getViewRootImpl() != null) {
- // TODO: deduplicate against the first part of #getValidParentSurfaceForMagnifier()
- final Surface mainWindowSurface = mView.getViewRootImpl().mSurface;
- if (mainWindowSurface != null && mainWindowSurface.isValid()) {
- mWindowCoords.x += mViewCoordinatesInSurface[0];
- mWindowCoords.y += mViewCoordinatesInSurface[1];
- }
+ if (mParentSurface != mContentCopySurface) {
+ mWindowCoords.x += mViewCoordinatesInSurface[0];
+ mWindowCoords.y += mViewCoordinatesInSurface[1];
}
}
private void performPixelCopy(final int startXInSurface, final int startYInSurface,
final boolean updateWindowPosition) {
- // Get the view surface where the content will be copied from.
- final Surface surface;
- final int surfaceWidth;
- final int surfaceHeight;
- if (mView instanceof SurfaceView) {
- final SurfaceHolder surfaceHolder = ((SurfaceView) mView).getHolder();
- surface = surfaceHolder.getSurface();
- surfaceWidth = surfaceHolder.getSurfaceFrame().right;
- surfaceHeight = surfaceHolder.getSurfaceFrame().bottom;
- } else if (mView.getViewRootImpl() != null) {
- final ViewRootImpl viewRootImpl = mView.getViewRootImpl();
- surface = viewRootImpl.mSurface;
- final Rect surfaceInsets = viewRootImpl.mWindowAttributes.surfaceInsets;
- surfaceWidth = viewRootImpl.getWidth() + surfaceInsets.left + surfaceInsets.right;
- surfaceHeight = viewRootImpl.getHeight() + surfaceInsets.top + surfaceInsets.bottom;
- } else {
- surface = null;
- surfaceWidth = NONEXISTENT_PREVIOUS_CONFIG_VALUE;
- surfaceHeight = NONEXISTENT_PREVIOUS_CONFIG_VALUE;
- }
-
- if (surface == null || !surface.isValid()) {
+ if (mContentCopySurface.mSurface == null || !mContentCopySurface.mSurface.isValid()) {
return;
}
-
// Clamp copy coordinates inside the surface to avoid displaying distorted content.
final int clampedStartXInSurface = Math.max(0,
- Math.min(startXInSurface, surfaceWidth - mBitmapWidth));
+ Math.min(startXInSurface, mContentCopySurface.mWidth - mBitmapWidth));
final int clampedStartYInSurface = Math.max(0,
- Math.min(startYInSurface, surfaceHeight - mBitmapHeight));
+ Math.min(startYInSurface, mContentCopySurface.mHeight - mBitmapHeight));
// Clamp window coordinates inside the parent surface, to avoid displaying
// the magnifier out of screen or overlapping with system insets.
- Rect windowBounds = null;
- if (mView.getViewRootImpl() != null) {
- // TODO: deduplicate against the first part of #getValidParentSurfaceForMagnifier()
- // TODO: deduplicate against the first part of the current method
- final ViewRootImpl viewRootImpl = mView.getViewRootImpl();
- final Surface parentSurface = viewRootImpl.mSurface;
- final Rect surfaceInsets = viewRootImpl.mWindowAttributes.surfaceInsets;
- final int parentWidth =
- viewRootImpl.getWidth() + surfaceInsets.left + surfaceInsets.right;
- final int parentHeight =
- viewRootImpl.getHeight() + surfaceInsets.top + surfaceInsets.bottom;
- if (parentSurface != null && parentSurface.isValid()) {
- final Rect systemInsets = mView.getRootWindowInsets().getSystemWindowInsets();
- windowBounds = new Rect(systemInsets.left, systemInsets.top,
- parentWidth - systemInsets.right, parentHeight - systemInsets.bottom);
- }
- }
- if (windowBounds == null && mView instanceof SurfaceView) {
- windowBounds = ((SurfaceView) mView).getHolder().getSurfaceFrame();
+ final Rect windowBounds;
+ if (mParentSurface.mIsMainWindowSurface) {
+ final Rect systemInsets = mView.getRootWindowInsets().getSystemWindowInsets();
+ windowBounds = new Rect(systemInsets.left, systemInsets.top,
+ mParentSurface.mWidth - systemInsets.right,
+ mParentSurface.mHeight - systemInsets.bottom);
+ } else {
+ windowBounds = new Rect(0, 0, mParentSurface.mWidth, mParentSurface.mHeight);
}
-
final int windowCoordsX = Math.max(windowBounds.left,
Math.min(windowBounds.right - mWindowWidth, mWindowCoords.x));
final int windowCoordsY = Math.max(windowBounds.top,
final InternalPopupWindow currentWindowInstance = mWindow;
final Bitmap bitmap =
Bitmap.createBitmap(mBitmapWidth, mBitmapHeight, Bitmap.Config.ARGB_8888);
- PixelCopy.request(surface, mPixelCopyRequestRect, bitmap,
+ PixelCopy.request(mContentCopySurface.mSurface, mPixelCopyRequestRect, bitmap,
result -> {
synchronized (mLock) {
if (mWindow != currentWindowInstance) {
}
/**
+ * Contains a surface and metadata corresponding to it.
+ */
+ private static class SurfaceInfo {
+ public static final SurfaceInfo NULL = new SurfaceInfo(null, 0, 0, false);
+
+ private Surface mSurface;
+ private int mWidth;
+ private int mHeight;
+ private boolean mIsMainWindowSurface;
+
+ SurfaceInfo(final Surface surface, final int width, final int height,
+ final boolean isMainWindowSurface) {
+ mSurface = surface;
+ mWidth = width;
+ mHeight = height;
+ mIsMainWindowSurface = isMainWindowSurface;
+ }
+ }
+
+ /**
* Magnifier's own implementation of PopupWindow-similar floating window.
* This exists to ensure frame-synchronization between window position updates and window
* content updates. By using a PopupWindow, these events would happen in different frames,
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