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Add Javadocs to Zoom.java

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This commit is contained in:
misaochan 2018-05-29 19:07:53 +10:00
parent fe185e0da8
commit 82659316ff
1 changed files with 20 additions and 6 deletions
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26
app/src/main/java/fr/free/nrw/commons/upload/Zoom.java
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@ -17,6 +17,9 @@ import java.io.InputStream;
import timber.log.Timber;
/**
* Contains utility methods for the Zoom function in ShareActivity.
*/
public class Zoom {
private View thumbView;
@ -29,6 +32,12 @@ public class Zoom {
this.flContainer = flContainer;
}
/**
* Create a scaled bitmap to display the zoomed-in image
* @param input the input stream corresponding to the uploaded image
* @param imageUri the uploaded image's URI
* @return a zoomable bitmap
*/
Bitmap createScaledImage(InputStream input, Uri imageUri) {
Bitmap scaled = null;
@ -64,13 +73,18 @@ public class Zoom {
return scaled;
}
/**
* Calculate the starting and ending bounds for the zoomed-in image.
* Also set the container view's offset as the origin for the
* bounds, since that's the origin for the positioning animation
* properties (X, Y).
* @param startBounds the global visible rectangle of the thumbnail
* @param finalBounds the global visible rectangle of the container view
* @param globalOffset the container view's offset
* @return scaled start bounds
*/
float adjustStartEndBounds(Rect startBounds, Rect finalBounds, Point globalOffset) {
// Calculate the starting and ending bounds for the zoomed-in image.
// The start bounds are the global visible rectangle of the thumbnail,
// and the final bounds are the global visible rectangle of the container
// view. Also set the container view's offset as the origin for the
// bounds, since that's the origin for the positioning animation
// properties (X, Y).
thumbView.getGlobalVisibleRect(startBounds);
flContainer.getGlobalVisibleRect(finalBounds, globalOffset);
startBounds.offset(-globalOffset.x, -globalOffset.y);