/// <summary>
/// Starts a drag.
/// </summary>
/// <param name="b"> The bitmap to display as the drag image. It will be re-scaled to the
/// enlarged size. </param>
/// <param name="screenX"> The x position on screen of the left-top of the bitmap. </param>
/// <param name="screenY"> The y position on screen of the left-top of the bitmap. </param>
/// <param name="textureLeft"> The left edge of the region inside b to use. </param>
/// <param name="textureTop"> The top edge of the region inside b to use. </param>
/// <param name="textureWidth"> The width of the region inside b to use. </param>
/// <param name="textureHeight"> The height of the region inside b to use. </param>
/// <param name="source"> An object representing where the drag originated </param>
/// <param name="dragInfo"> The data associated with the object that is being dragged </param>
/// <param name="dragAction"> The drag action: either <seealso cref="#DRAG_ACTION_MOVE"/> or
/// <seealso cref="#DRAG_ACTION_COPY"/> </param>
public void StartDrag(Bitmap b, int screenX, int screenY, int textureLeft, int textureTop, int textureWidth, int textureHeight, IDragSource source, object dragInfo, int dragAction)
{
if (PROFILE_DRAWING_DURING_DRAG)
{
Debug.StartMethodTracing("Launcher");
}
// Hide soft keyboard, if visible
if (mInputMethodManager == null)
{
mInputMethodManager = (InputMethodManager)mContext.GetSystemService(Context.InputMethodService);
}
mInputMethodManager.HideSoftInputFromWindow(mWindowToken, 0);
if (mListener != null)
{
mListener.OnDragStart(source, dragInfo, dragAction);
}
int registrationX = ((int)mMotionDownX) - screenX;
int registrationY = ((int)mMotionDownY) - screenY;
mTouchOffsetX = mMotionDownX - screenX;
mTouchOffsetY = mMotionDownY - screenY;
mDragging = true;
mDragSource = source;
mDragInfo = dragInfo;
//mVibrator.vibrate(VIBRATE_DURATION);
DragView dragView = mDragView = new DragView(mContext, b, registrationX, registrationY, textureLeft, textureTop, textureWidth, textureHeight);
dragView.Show(mWindowToken, (int)mMotionDownX, (int)mMotionDownY);
}
private void EndDrag()
{
if (mDragging)
{
mDragging = false;
if (mOriginator != null)
{
mOriginator.Visibility = ViewStates.Invisible;
}
if (mListener != null)
{
mListener.OnDragEnd();
}
if (mDragView != null)
{
mDragView.Remove();
mDragView = null;
}
}
}
/// <summary>
/// Estimate the surface area where this object would land if dropped at the
/// given location.
/// </summary>
/// <param name="source"> DragSource where the drag started </param>
/// <param name="x"> X coordinate of the drop location </param>
/// <param name="y"> Y coordinate of the drop location </param>
/// <param name="xOffset"> Horizontal offset with the object being dragged where the
/// original touch happened </param>
/// <param name="yOffset"> Vertical offset with the object being dragged where the
/// original touch happened </param>
/// <param name="dragView"> The DragView that's being dragged around on screen. </param>
/// <param name="dragInfo"> Data associated with the object being dragged </param>
/// <param name="recycle"> <seealso cref="Rect"/> object to be possibly recycled. </param>
/// <returns> Estimated area that would be occupied if object was dropped at
/// the given location. Should return null if no estimate is found,
/// or if this target doesn't provide estimations. </returns>
public Rect EstimateDropLocation(IDragSource source, int x, int y, int xOffset, int yOffset, DragView dragView, object dragInfo, Rect recycle)
{
return(null);
}
/// <summary>
/// Check if a drop action can occur at, or near, the requested location.
/// This may be called repeatedly during a drag, so any calls should return
/// quickly.
/// </summary>
/// <param name="source"> DragSource where the drag started </param>
/// <param name="x"> X coordinate of the drop location </param>
/// <param name="y"> Y coordinate of the drop location </param>
/// <param name="xOffset"> Horizontal offset with the object being dragged where the
/// original touch happened </param>
/// <param name="yOffset"> Vertical offset with the object being dragged where the
/// original touch happened </param>
/// <param name="dragView"> The DragView that's being dragged around on screen. </param>
/// <param name="dragInfo"> Data associated with the object being dragged </param>
/// <returns> True if the drop will be accepted, false otherwise. </returns>
public bool AcceptDrop(IDragSource source, int x, int y, int xOffset, int yOffset, DragView dragView, object dragInfo)
{
return(true);
}
public void OnDragExit(IDragSource source, int x, int y, int xOffset, int yOffset, DragView dragView, object dragInfo)
{
}
public void OnDragOver(IDragSource source, int x, int y, int xOffset, int yOffset, DragView dragView, object dragInfo)
{
View v = (View)dragInfo;
int w = v.Width;
int h = v.Height;
int left = x - xOffset;
int top = y - yOffset;
DragLayer.LayoutParams lp = new DragLayer.LayoutParams(w, h, left, top);
this.UpdateViewLayout(v, lp);
}
