/*
* A touch point (x,y) occurs in LayerView, this point should be displayed
* in the center of the zoomed view. The returned point is the position of
* the Top-Left zoomed view point on the screen device
*/
private PointF getZoomedViewTopLeftPositionFromTouchPosition(float x, float y) {
ImmutableViewportMetrics metrics = layerView.getViewportMetrics();
final float parentWidth = metrics.getWidth();
final float parentHeight = metrics.getHeight();
// See comments in getUnzoomedPositionFromPointInZoomedView, but the
// transformations here are largely the reverse of that function.
float visibleContentPixels = viewWidth / zoomFactor;
float maxContentOffset = parentWidth - visibleContentPixels;
float maxZoomedViewOffset = parentWidth - viewContainerWidth;
float contentPixelOffset = x - (visibleContentPixels / 2.0f);
returnValue.x = (int) (contentPixelOffset * (maxZoomedViewOffset / maxContentOffset));
visibleContentPixels = viewHeight / zoomFactor;
maxContentOffset = parentHeight - visibleContentPixels;
maxZoomedViewOffset = parentHeight - (viewContainerHeight - toolbarHeight);
contentPixelOffset = y - (visibleContentPixels / 2.0f);
float unscaledViewOffset = layerView.getSurfaceTranslation() - offsetDueToToolBarPosition;
returnValue.y =
(int)
((contentPixelOffset * (maxZoomedViewOffset / maxContentOffset)) + unscaledViewOffset);
return returnValue;
}
private void setCapturedSize(ImmutableViewportMetrics metrics) {
float parentMinSize = Math.min(metrics.getWidth(), metrics.getHeight());
viewWidth =
(int) ((parentMinSize * W_CAPTURED_VIEW_IN_PERCENT / (zoomFactor * 100.0)) * zoomFactor);
viewHeight =
(int) ((parentMinSize * H_CAPTURED_VIEW_IN_PERCENT / (zoomFactor * 100.0)) * zoomFactor);
viewContainerHeight = viewHeight + toolbarHeight + 2 * containterSize; // Top and bottom shadows
viewContainerWidth = viewWidth + 2 * containterSize; // Right and left shadows
// Display in zoomedview is corrupted when width is an odd number
// More details about this issue here: bug 776906 comment 11
viewWidth &= ~0x1;
}
/*
* Convert a click from ZoomedView. Return the position of the click in the
* LayerView
*/
private PointF getUnzoomedPositionFromPointInZoomedView(float x, float y) {
ImmutableViewportMetrics metrics = layerView.getViewportMetrics();
final float parentWidth = metrics.getWidth();
final float parentHeight = metrics.getHeight();
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) getLayoutParams();
// The number of unzoomed content pixels that can be displayed in the
// zoomed area.
float visibleContentPixels = viewWidth / zoomFactor;
// The offset in content pixels of the leftmost zoomed pixel from the
// layerview's left edge when the zoomed view is moved to the right as
// far as it can go.
float maxContentOffset = parentWidth - visibleContentPixels;
// The maximum offset in screen pixels that the zoomed view can have
float maxZoomedViewOffset = parentWidth - viewContainerWidth;
// The above values allow us to compute the term
// maxContentOffset / maxZoomedViewOffset
// which is the number of content pixels that we should move over by
// for every screen pixel that the zoomed view is moved over by.
// This allows a smooth transition from when the zoomed view is at the
// leftmost extent to when it is at the rightmost extent.
// This is the offset in content pixels of the leftmost zoomed pixel
// visible in the zoomed view. This value is relative to the layerview
// edge.
float zoomedContentOffset =
((float) params.leftMargin) * maxContentOffset / maxZoomedViewOffset;
returnValue.x = (int) (zoomedContentOffset + (x / zoomFactor));
// Same comments here vertically
visibleContentPixels = viewHeight / zoomFactor;
maxContentOffset = parentHeight - visibleContentPixels;
maxZoomedViewOffset = parentHeight - (viewContainerHeight - toolbarHeight);
float zoomedAreaOffset =
(float) params.topMargin + offsetDueToToolBarPosition - layerView.getSurfaceTranslation();
zoomedContentOffset = zoomedAreaOffset * maxContentOffset / maxZoomedViewOffset;
returnValue.y = (int) (zoomedContentOffset + ((y - offsetDueToToolBarPosition) / zoomFactor));
return returnValue;
}