android/source/src/java/org/libreoffice/canvas/SelectionHandle.java

   1 package org.libreoffice.canvas;
   2
   3 import android.graphics.Bitmap;
   4 import android.graphics.PointF;
   5
   6 import org.libreoffice.LOKitShell;
   7 import org.libreoffice.LibreOfficeMainActivity;
   8 import org.mozilla.gecko.gfx.ImmutableViewportMetrics;
   9
  10 /**
  11  * Selection handle is a common class for "start", "middle" and "end" types
  12  * of selection handles.
  13  */
  14 public abstract class SelectionHandle extends BitmapHandle {
  15     private static final long MINIMUM_HANDLE_UPDATE_TIME = 50 * 1000000;
  16
  17     private final PointF mDragStartPoint = new PointF();
  18     private final PointF mDragDocumentPosition = new PointF();
  19     private long mLastTime = 0;
  20
  21     private LibreOfficeMainActivity mContext;
  22
  23     public SelectionHandle(LibreOfficeMainActivity context, Bitmap bitmap) {
  24         super(bitmap);
  25         mContext = context;
  26     }
  27
  28     /**
  29      * Start of a touch and drag action on the handle.
  30      */
  31     public void dragStart(PointF point) {
  32         mDragStartPoint.x = point.x;
  33         mDragStartPoint.y = point.y;
  34         mDragDocumentPosition.x = mDocumentPosition.left;
  35         mDragDocumentPosition.y = mDocumentPosition.top;
  36     }
  37
  38     /**
  39      * End of a touch and drag action on the handle.
  40      */
  41     public void dragEnd(PointF point) {
  42     }
  43
  44     /**
  45      * Handle has been dragged.
  46      */
  47     public void dragging(PointF point) {
  48         long currentTime = System.nanoTime();
  49         if (currentTime - mLastTime > MINIMUM_HANDLE_UPDATE_TIME) {
  50             mLastTime = currentTime;
  51             signalHandleMove(point.x, point.y);
  52         }
  53     }
  54
  55     /**
  56      * Signal to move the handle to a new position to LO.
  57      */
  58     private void signalHandleMove(float newX, float newY) {
  59         ImmutableViewportMetrics viewportMetrics = mContext.getLayerClient().getViewportMetrics();
  60         float zoom = viewportMetrics.zoomFactor;
  61
  62         float deltaX = (newX - mDragStartPoint.x) / zoom;
  63         float deltaY = (newY - mDragStartPoint.y) / zoom;
  64
  65         PointF documentPoint = new PointF(mDragDocumentPosition.x + deltaX, mDragDocumentPosition.y + deltaY);
  66
  67         LOKitShell.sendChangeHandlePositionEvent(getHandleType(), documentPoint);
  68     }
  69
  70     public abstract HandleType getHandleType();
  71
  72     public enum HandleType { START, MIDDLE, END }
  73 }