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