/*
* DragSortListView.
*
* A subclass of the Android ListView component that enables drag
* and drop re-ordering of list items.
*
* Copyright 2012 Carl Bauer
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.mobeta.android.dslv;
import android.content.Context;
import android.content.res.TypedArray;
import android.database.DataSetObserver;
import android.graphics.Canvas;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.util.SparseIntArray;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.Checkable;
import android.widget.ListAdapter;
import android.widget.ListView;
import com.mkulesh.onpc.R;
import java.util.ArrayList;
/**
* ListView subclass that mediates drag and drop resorting of items.
*
* @author heycosmo
*/
public class DragSortListView extends ListView
{
/**
* The View that floats above the ListView and represents
* the dragged item.
*/
private View mFloatView;
/**
* The float View location. First based on touch location
* and given deltaX and deltaY. Then restricted by callback
* to FloatViewManager.onDragFloatView(). Finally restricted
* by bounds of DSLV.
*/
private final Point mFloatLoc = new Point();
private final Point mTouchLoc = new Point();
/**
* The middle (in the y-direction) of the floating View.
*/
private int mFloatViewMid;
/**
* Flag to make sure float View isn't measured twice
*/
private boolean mFloatViewOnMeasured = false;
/**
* Watch the Adapter for data changes. Cancel a drag if
* coincident with a change.
*/
private final DataSetObserver mObserver;
/**
* Transparency for the floating View (XML attribute).
*/
private float mFloatAlpha = 1.0f;
private float mCurrFloatAlpha = 1.0f;
/**
* While drag-sorting, the current position of the floating
* View. If dropped, the dragged item will land in this position.
*/
private int mFloatPos;
/**
* The first expanded ListView position that helps represent
* the drop slot tracking the floating View.
*/
private int mFirstExpPos;
/**
* The second expanded ListView position that helps represent
* the drop slot tracking the floating View. This can equal
* mFirstExpPos if there is no slide shuffle occurring; otherwise
* it is equal to mFirstExpPos + 1.
*/
private int mSecondExpPos;
/**
* Flag set if slide shuffling is enabled.
*/
private boolean mAnimate = false;
/**
* The user dragged from this position.
*/
private int mSrcPos;
/**
* Offset (in x) within the dragged item at which the user
* picked it up (or first touched down with the digitalis).
*/
private int mDragDeltaX;
/**
* Offset (in y) within the dragged item at which the user
* picked it up (or first touched down with the digitalis).
*/
private int mDragDeltaY;
/**
* A listener that receives callbacks whenever the floating View
* hovers over a new position.
*/
private DragListener mDragListener;
/**
* A listener that receives a callback when the floating View
* is dropped.
*/
private DropListener mDropListener;
/**
* A listener that receives a callback when the floating View
* (or more precisely the originally dragged item) is removed
* by one of the provided gestures.
*/
private RemoveListener mRemoveListener;
/**
* Enable/Disable item dragging
*/
private boolean mDragEnabled = true;
/**
* Drag state enum.
*/
private final static int IDLE = 0;
private final static int REMOVING = 1;
private final static int DROPPING = 2;
private final static int STOPPED = 3;
private final static int DRAGGING = 4;
private int mDragState = IDLE;
/**
* Height in pixels to which the originally dragged item
* is collapsed during a drag-sort. Currently, this value
* must be greater than zero.
*/
private int mItemHeightCollapsed = 1;
/**
* Height of the floating View. Stored for the purpose of
* providing the tracking drop slot.
*/
private int mFloatViewHeight;
/**
* Convenience member. See above.
*/
private int mFloatViewHeightHalf;
/**
* Save the given width spec for use in measuring children
*/
private int mWidthMeasureSpec = 0;
/**
* Sample Views ultimately used for calculating the height
* of ListView items that are off-screen.
*/
private View[] mSampleViewTypes = new View[1];
/**
* Drag-scroll encapsulator!
*/
private final DragScroller mDragScroller;
/**
* Determines the start of the upward drag-scroll region
* at the top of the ListView. Specified by a fraction
* of the ListView height, thus screen resolution agnostic.
*/
private float mDragUpScrollStartFrac = 1.0f / 3.0f;
/**
* Determines the start of the downward drag-scroll region
* at the bottom of the ListView. Specified by a fraction
* of the ListView height, thus screen resolution agnostic.
*/
private float mDragDownScrollStartFrac = 1.0f / 3.0f;
/**
* The following are calculated from the above fracs.
*/
private int mUpScrollStartY;
private int mDownScrollStartY;
private float mDownScrollStartYF;
private float mUpScrollStartYF;
/**
* Calculated from above above and current ListView height.
*/
private float mDragUpScrollHeight;
/**
* Calculated from above above and current ListView height.
*/
private float mDragDownScrollHeight;
/**
* Maximum drag-scroll speed in pixels per ms. Only used with
* default linear drag-scroll profile.
*/
private float mMaxScrollSpeed = 0.5f;
/**
* Defines the scroll speed during a drag-scroll. User can
* provide their own; this default is a simple linear profile
* where scroll speed increases linearly as the floating View
* nears the top/bottom of the ListView.
*/
private final DragScrollProfile mScrollProfile = new DragScrollProfile()
{
@Override
public float getSpeed(float w, long t)
{
return mMaxScrollSpeed * w;
}
};
/**
* Current touch x.
*/
private int mX;
/**
* Current touch y.
*/
private int mY;
/**
* Last touch y.
*/
private int mLastY;
/**
* Drag flag bit. Floating View can move in the positive
* x direction.
*/
final static int DRAG_POS_X = 0x1;
/**
* Drag flag bit. Floating View can move in the negative
* x direction.
*/
final static int DRAG_NEG_X = 0x2;
/**
* Drag flag bit. Floating View can move in the positive
* y direction. This is subtle. What this actually means is
* that, if enabled, the floating View can be dragged below its starting
* position. Remove in favor of upper-bounding item position?
*/
final static int DRAG_POS_Y = 0x4;
/**
* Drag flag bit. Floating View can move in the negative
* y direction. This is subtle. What this actually means is
* that the floating View can be dragged above its starting
* position. Remove in favor of lower-bounding item position?
*/
final static int DRAG_NEG_Y = 0x8;
/**
* Flags that determine limits on the motion of the
* floating View. See flags above.
*/
private int mDragFlags = 0;
/**
* Last call to an on*TouchEvent was a call to
* onInterceptTouchEvent.
*/
private boolean mLastCallWasIntercept = false;
/**
* A touch event is in progress.
*/
private boolean mInTouchEvent = false;
/**
* Let the user customize the floating View.
*/
private FloatViewManager mFloatViewManager = null;
/**
* Given to ListView to cancel its action when a drag-sort
* begins.
*/
private final MotionEvent mCancelEvent;
/**
* Enum telling where to cancel the ListView action when a
* drag-sort begins
*/
private static final int NO_CANCEL = 0;
private static final int ON_TOUCH_EVENT = 1;
private static final int ON_INTERCEPT_TOUCH_EVENT = 2;
/**
* Where to cancel the ListView action when a
* drag-sort begins
*/
private int mCancelMethod = NO_CANCEL;
/**
* Determines when a slide shuffle animation starts. That is,
* defines how close to the edge of the drop slot the floating
* View must be to initiate the slide.
*/
private float mSlideRegionFrac = 0.25f;
/**
* Number between 0 and 1 indicating the relative location of
* a sliding item (only used if drag-sort animations
* are turned on). Nearly 1 means the item is
* at the top of the slide region (nearly full blank item
* is directly below).
*/
private float mSlideFrac = 0.0f;
/**
* Wraps the user-provided ListAdapter. This is used to wrap each
* item View given by the user inside another View (currenly
* a RelativeLayout) which
* expands and collapses to simulate the item shuffling.
*/
private AdapterWrapper mAdapterWrapper;
/**
* Needed for adjusting item heights from within layoutChildren
*/
private boolean mBlockLayoutRequests = false;
/**
* Set to true when a down event happens during drag sort;
* for example, when drag finish animations are
* playing.
*/
private boolean mIgnoreTouchEvent = false;
/**
* Caches DragSortItemView child heights. Sometimes DSLV has to
* know the height of an offscreen item. Since ListView virtualizes
* these, DSLV must get the item from the ListAdapter to obtain
* its height. That process can be expensive, but often the same
* offscreen item will be requested many times in a row. Once an
* offscreen item height is calculated, we cache it in this guy.
* Actually, we cache the height of the child of the
* DragSortItemView since the item height changes often during a
* drag-sort.
*/
private static final int sCacheSize = 3;
private final HeightCache mChildHeightCache = new HeightCache(sCacheSize);
private RemoveAnimator mRemoveAnimator;
private DropAnimator mDropAnimator;
private boolean mUseRemoveVelocity;
private float mRemoveVelocityX = 0;
public DragSortListView(Context context, AttributeSet attrs)
{
super(context, attrs);
int defaultDuration = 150;
int removeAnimDuration = defaultDuration; // ms
int dropAnimDuration = defaultDuration; // ms
if (attrs != null)
{
TypedArray a = getContext().obtainStyledAttributes(attrs,
R.styleable.DragSortListView, 0, 0);
mItemHeightCollapsed = Math.max(1, a.getDimensionPixelSize(
R.styleable.DragSortListView_collapsed_height, 1));
// alpha between 0 and 255, 0=transparent, 255=opaque
mFloatAlpha = a.getFloat(R.styleable.DragSortListView_float_alpha, mFloatAlpha);
mCurrFloatAlpha = mFloatAlpha;
mDragEnabled = a.getBoolean(R.styleable.DragSortListView_drag_enabled, mDragEnabled);
mSlideRegionFrac = Math.max(0.0f,
Math.min(1.0f, 1.0f - a.getFloat(
R.styleable.DragSortListView_slide_shuffle_speed,
0.75f)));
mAnimate = mSlideRegionFrac > 0.0f;
float frac = a.getFloat(
R.styleable.DragSortListView_drag_scroll_start,
mDragUpScrollStartFrac);
setDragScrollStart(frac);
mMaxScrollSpeed = a.getFloat(
R.styleable.DragSortListView_max_drag_scroll_speed,
mMaxScrollSpeed);
removeAnimDuration = a.getInt(
R.styleable.DragSortListView_remove_animation_duration,
removeAnimDuration);
dropAnimDuration = a.getInt(
R.styleable.DragSortListView_drop_animation_duration,
dropAnimDuration);
boolean useDefault = a.getBoolean(
R.styleable.DragSortListView_use_default_controller,
true);
if (useDefault)
{
boolean removeEnabled = a.getBoolean(
R.styleable.DragSortListView_remove_enabled,
false);
int removeMode = a.getInt(
R.styleable.DragSortListView_remove_mode,
DragSortController.FLING_REMOVE);
boolean sortEnabled = a.getBoolean(
R.styleable.DragSortListView_sort_enabled,
true);
int dragInitMode = a.getInt(
R.styleable.DragSortListView_drag_start_mode,
DragSortController.ON_DOWN);
int dragHandleId = a.getResourceId(
R.styleable.DragSortListView_drag_handle_id,
0);
int flingHandleId = a.getResourceId(
R.styleable.DragSortListView_fling_handle_id,
0);
int clickRemoveId = a.getResourceId(
R.styleable.DragSortListView_click_remove_id,
0);
int bgResource = a.getResourceId(
R.styleable.DragSortListView_float_background_id,
0);
DragSortController controller = new DragSortController(
this, dragHandleId, dragInitMode, removeMode,
clickRemoveId, flingHandleId);
controller.setRemoveEnabled(removeEnabled);
controller.setSortEnabled(sortEnabled);
controller.setBackgroundResource(bgResource);
mFloatViewManager = controller;
// must register this on ListView (super), not 'this'.
super.setOnTouchListener(controller);
}
a.recycle();
}
mDragScroller = new DragScroller();
float smoothness = 0.5f;
if (removeAnimDuration > 0)
{
mRemoveAnimator = new RemoveAnimator(smoothness, removeAnimDuration);
}
if (dropAnimDuration > 0)
{
mDropAnimator = new DropAnimator(smoothness, dropAnimDuration);
}
mCancelEvent = MotionEvent.obtain(0, 0, MotionEvent.ACTION_CANCEL, 0f, 0f, 0f, 0f, 0, 0f,
0f, 0, 0);
// construct the dataset observer
mObserver = new DataSetObserver()
{
private void cancel()
{
if (mDragState == DRAGGING)
{
cancelDrag();
}
}
@Override
public void onChanged()
{
cancel();
}
@Override
public void onInvalidated()
{
cancel();
}
};
}
/**
* DragSortListView registers the the controler as an onTouch listener.
* We implement this method to ensure that users of this listview can also
* register their own onTouch listener without disabling our own registration.
*/
@Override
public void setOnTouchListener(View.OnTouchListener l)
{
if (mFloatViewManager != null)
{
mFloatViewManager.setSecondaryOnTouchListener(l);
}
}
/**
* For each DragSortListView Listener interface implemented by
* <code>adapter</code>, this method calls the appropriate
* set*Listener method with <code>adapter</code> as the argument.
*
* @param adapter The ListAdapter providing data to back
* DragSortListView.
* @see android.widget.ListView#setAdapter(android.widget.ListAdapter)
*/
@Override
public void setAdapter(ListAdapter adapter)
{
if (adapter != null)
{
mAdapterWrapper = new AdapterWrapper(adapter);
adapter.registerDataSetObserver(mObserver);
if (adapter instanceof DropListener)
{
setDropListener((DropListener) adapter);
}
if (adapter instanceof DragListener)
{
setDragListener((DragListener) adapter);
}
if (adapter instanceof RemoveListener)
{
setRemoveListener((RemoveListener) adapter);
}
}
else
{
mAdapterWrapper = null;
}
super.setAdapter(mAdapterWrapper);
}
private class AdapterWrapper extends BaseAdapter
{
private final ListAdapter mAdapter;
AdapterWrapper(ListAdapter adapter)
{
super();
mAdapter = adapter;
mAdapter.registerDataSetObserver(new DataSetObserver()
{
public void onChanged()
{
notifyDataSetChanged();
}
public void onInvalidated()
{
notifyDataSetInvalidated();
}
});
}
@Override
public long getItemId(int position)
{
return mAdapter.getItemId(position);
}
@Override
public Object getItem(int position)
{
return mAdapter.getItem(position);
}
@Override
public int getCount()
{
return mAdapter.getCount();
}
@Override
public boolean areAllItemsEnabled()
{
return mAdapter.areAllItemsEnabled();
}
@Override
public boolean isEnabled(int position)
{
return mAdapter.isEnabled(position);
}
@Override
public int getItemViewType(int position)
{
return mAdapter.getItemViewType(position);
}
@Override
public int getViewTypeCount()
{
return mAdapter.getViewTypeCount();
}
@Override
public boolean hasStableIds()
{
return mAdapter.hasStableIds();
}
@Override
public boolean isEmpty()
{
return mAdapter.isEmpty();
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
DragSortItemView v;
View child;
// Log.d("mobeta",
// "getView: position="+position+" convertView="+convertView);
if (convertView != null)
{
v = (DragSortItemView) convertView;
View oldChild = v.getChildAt(0);
child = mAdapter.getView(position, oldChild, DragSortListView.this);
if (child != oldChild)
{
// shouldn't get here if user is reusing convertViews
// properly
if (oldChild != null)
{
v.removeViewAt(0);
}
v.addView(child);
}
}
else
{
child = mAdapter.getView(position, null, DragSortListView.this);
if (child instanceof Checkable)
{
v = new DragSortItemViewCheckable(getContext());
}
else
{
v = new DragSortItemView(getContext());
}
v.setLayoutParams(new AbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
v.addView(child);
}
// Set the correct item height given drag state; passed
// View needs to be measured if measurement is required.
adjustItem(position + getHeaderViewsCount(), v, true);
return v;
}
}
private void drawDivider(int expPosition, Canvas canvas)
{
final Drawable divider = getDivider();
final int dividerHeight = getDividerHeight();
// Log.d("mobeta", "div="+divider+" divH="+dividerHeight);
if (divider != null && dividerHeight != 0)
{
final ViewGroup expItem = (ViewGroup) getChildAt(expPosition
- getFirstVisiblePosition());
if (expItem != null)
{
final int l = getPaddingLeft();
final int r = getWidth() - getPaddingRight();
final int t;
final int b;
final int childHeight = expItem.getChildAt(0).getHeight();
if (expPosition > mSrcPos)
{
t = expItem.getTop() + childHeight;
b = t + dividerHeight;
}
else
{
b = expItem.getBottom() - childHeight;
t = b - dividerHeight;
}
// Log.d("mobeta", "l="+l+" t="+t+" r="+r+" b="+b);
// Have to clip to support ColorDrawable on <= Gingerbread
canvas.save();
canvas.clipRect(l, t, r, b);
divider.setBounds(l, t, r, b);
divider.draw(canvas);
canvas.restore();
}
}
}
@Override
protected void dispatchDraw(Canvas canvas)
{
super.dispatchDraw(canvas);
if (mDragState != IDLE)
{
// draw the divider over the expanded item
if (mFirstExpPos != mSrcPos)
{
drawDivider(mFirstExpPos, canvas);
}
if (mSecondExpPos != mFirstExpPos && mSecondExpPos != mSrcPos)
{
drawDivider(mSecondExpPos, canvas);
}
}
if (mFloatView != null)
{
// draw the float view over everything
final int w = mFloatView.getWidth();
final int h = mFloatView.getHeight();
int x = mFloatLoc.x;
int width = getWidth();
if (x < 0)
x = -x;
float alphaMod;
if (x < width)
{
alphaMod = ((float) (width - x)) / ((float) width);
alphaMod *= alphaMod;
}
else
{
alphaMod = 0;
}
final int alpha = (int) (255f * mCurrFloatAlpha * alphaMod);
canvas.save();
// Log.d("mobeta", "clip rect bounds: " + canvas.getClipBounds());
canvas.translate(mFloatLoc.x, mFloatLoc.y);
canvas.clipRect(0, 0, w, h);
// Log.d("mobeta", "clip rect bounds: " + canvas.getClipBounds());
canvas.saveLayerAlpha(0, 0, w, h, alpha, Canvas.ALL_SAVE_FLAG);
mFloatView.draw(canvas);
canvas.restore();
canvas.restore();
}
}
private int getItemHeight(int position)
{
View v = getChildAt(position - getFirstVisiblePosition());
if (v != null)
{
// item is onscreen, just get the height of the View
return v.getHeight();
}
else
{
// item is offscreen. get child height and calculate
// item height based on current shuffle state
return calcItemHeight(position, getChildHeight(position));
}
}
private class HeightCache
{
private final SparseIntArray mMap;
private final ArrayList<Integer> mOrder;
private final int mMaxSize;
HeightCache(int size)
{
mMap = new SparseIntArray(size);
mOrder = new ArrayList<>(size);
mMaxSize = size;
}
/**
* Add item height at position if doesn't already exist.
*/
void add(int position, int height)
{
int currHeight = mMap.get(position, -1);
if (currHeight != height)
{
if (currHeight == -1)
{
if (mMap.size() == mMaxSize)
{
// remove oldest entry
mMap.delete(mOrder.remove(0));
}
}
else
{
// move position to newest slot
mOrder.remove((Integer) position);
}
mMap.put(position, height);
mOrder.add(position);
}
}
int get(int position)
{
return mMap.get(position, -1);
}
void clear()
{
mMap.clear();
mOrder.clear();
}
}
/**
* Get the shuffle edge for item at position when top of
* item is at y-coord top. Assumes that current item heights
* are consistent with current float view location and
* thus expanded positions and slide fraction. i.e. Should not be
* called between update of expanded positions/slide fraction
* and layoutChildren.
*/
private int getShuffleEdge(int position, int top)
{
final int numHeaders = getHeaderViewsCount();
final int numFooters = getFooterViewsCount();
// shuffle edges are defined between items that can be
// dragged; there are N-1 of them if there are N draggable
// items.
if (position <= numHeaders || (position >= getCount() - numFooters))
{
return top;
}
int divHeight = getDividerHeight();
int edge;
int maxBlankHeight = mFloatViewHeight - mItemHeightCollapsed;
int childHeight = getChildHeight(position);
int itemHeight = getItemHeight(position);
// first calculate top of item given that floating View is
// centered over src position
int otop = top;
if (mSecondExpPos <= mSrcPos)
{
// items are expanded on and/or above the source position
if (position == mSecondExpPos && mFirstExpPos != mSecondExpPos)
{
if (position == mSrcPos)
{
otop = top + itemHeight - mFloatViewHeight;
}
else
{
int blankHeight = itemHeight - childHeight;
otop = top + blankHeight - maxBlankHeight;
}
}
else if (position > mSecondExpPos && position <= mSrcPos)
{
otop = top - maxBlankHeight;
}
}
else
{
// items are expanded on and/or below the source position
if (position > mSrcPos && position <= mFirstExpPos)
{
otop = top + maxBlankHeight;
}
else if (position == mSecondExpPos && mFirstExpPos != mSecondExpPos)
{
int blankHeight = itemHeight - childHeight;
otop = top + blankHeight;
}
}
// otop is set
if (position <= mSrcPos)
{
edge = otop + (mFloatViewHeight - divHeight - getChildHeight(position - 1)) / 2;
}
else
{
edge = otop + (childHeight - divHeight - mFloatViewHeight) / 2;
}
return edge;
}
private boolean updatePositions()
{
final int first = getFirstVisiblePosition();
int startPos = mFirstExpPos;
View startView = getChildAt(startPos - first);
if (startView == null)
{
startPos = first + getChildCount() / 2;
startView = getChildAt(startPos - first);
}
int startTop = startView.getTop();
int itemHeight = startView.getHeight();
int edge = getShuffleEdge(startPos, startTop);
int lastEdge = edge;
int divHeight = getDividerHeight();
// Log.d("mobeta", "float mid="+mFloatViewMid);
int itemPos = startPos;
int itemTop = startTop;
if (mFloatViewMid < edge)
{
// scanning up for float position
// Log.d("mobeta", " edge="+edge);
while (itemPos >= 0)
{
itemPos--;
itemHeight = getItemHeight(itemPos);
if (itemPos == 0)
{
edge = itemTop - divHeight - itemHeight;
break;
}
itemTop -= itemHeight + divHeight;
edge = getShuffleEdge(itemPos, itemTop);
// Log.d("mobeta", " edge="+edge);
if (mFloatViewMid >= edge)
{
break;
}
lastEdge = edge;
}
}
else
{
// scanning down for float position
// Log.d("mobeta", " edge="+edge);
final int count = getCount();
while (itemPos < count)
{
if (itemPos == count - 1)
{
edge = itemTop + divHeight + itemHeight;
break;
}
itemTop += divHeight + itemHeight;
itemHeight = getItemHeight(itemPos + 1);
edge = getShuffleEdge(itemPos + 1, itemTop);
// Log.d("mobeta", " edge="+edge);
// test for hit
if (mFloatViewMid < edge)
{
break;
}
lastEdge = edge;
itemPos++;
}
}
final int numHeaders = getHeaderViewsCount();
final int numFooters = getFooterViewsCount();
boolean updated = false;
int oldFirstExpPos = mFirstExpPos;
int oldSecondExpPos = mSecondExpPos;
float oldSlideFrac = mSlideFrac;
if (mAnimate)
{
int edgeToEdge = Math.abs(edge - lastEdge);
int edgeTop, edgeBottom;
if (mFloatViewMid < edge)
{
edgeBottom = edge;
edgeTop = lastEdge;
}
else
{
edgeTop = edge;
edgeBottom = lastEdge;
}
// Log.d("mobeta", "edgeTop="+edgeTop+" edgeBot="+edgeBottom);
int slideRgnHeight = (int) (0.5f * mSlideRegionFrac * edgeToEdge);
float slideRgnHeightF = (float) slideRgnHeight;
int slideEdgeTop = edgeTop + slideRgnHeight;
int slideEdgeBottom = edgeBottom - slideRgnHeight;
// Three regions
if (mFloatViewMid < slideEdgeTop)
{
mFirstExpPos = itemPos - 1;
mSecondExpPos = itemPos;
mSlideFrac = 0.5f * ((float) (slideEdgeTop - mFloatViewMid)) / slideRgnHeightF;
// Log.d("mobeta",
// "firstExp="+mFirstExpPos+" secExp="+mSecondExpPos+" slideFrac="+mSlideFrac);
}
else if (mFloatViewMid < slideEdgeBottom)
{
mFirstExpPos = itemPos;
mSecondExpPos = itemPos;
}
else
{
mFirstExpPos = itemPos;
mSecondExpPos = itemPos + 1;
mSlideFrac = 0.5f * (1.0f + ((float) (edgeBottom - mFloatViewMid))
/ slideRgnHeightF);
// Log.d("mobeta",
// "firstExp="+mFirstExpPos+" secExp="+mSecondExpPos+" slideFrac="+mSlideFrac);
}
}
else
{
mFirstExpPos = itemPos;
mSecondExpPos = itemPos;
}
// correct for headers and footers
if (mFirstExpPos < numHeaders)
{
itemPos = numHeaders;
mFirstExpPos = itemPos;
mSecondExpPos = itemPos;
}
else if (mSecondExpPos >= getCount() - numFooters)
{
itemPos = getCount() - numFooters - 1;
mFirstExpPos = itemPos;
mSecondExpPos = itemPos;
}
if (mFirstExpPos != oldFirstExpPos || mSecondExpPos != oldSecondExpPos
|| mSlideFrac != oldSlideFrac)
{
updated = true;
}
if (itemPos != mFloatPos)
{
if (mDragListener != null)
{
mDragListener.drag(mFloatPos - numHeaders, itemPos - numHeaders);
}
mFloatPos = itemPos;
updated = true;
}
return updated;
}
private class SmoothAnimator implements Runnable
{
long mStartTime;
private final float mDurationF;
private final float mAlpha;
private final float mA, mB, mC, mD;
private boolean mCanceled;
SmoothAnimator(float smoothness, int duration)
{
mAlpha = smoothness;
mDurationF = (float) duration;
mA = mD = 1f / (2f * mAlpha * (1f - mAlpha));
mB = mAlpha / (2f * (mAlpha - 1f));
mC = 1f / (1f - mAlpha);
}
float transform(float frac)
{
if (frac < mAlpha)
{
return mA * frac * frac;
}
else if (frac < 1f - mAlpha)
{
return mB + mC * frac;
}
else
{
return 1f - mD * (frac - 1f) * (frac - 1f);
}
}
void start()
{
mStartTime = SystemClock.uptimeMillis();
mCanceled = false;
onStart();
post(this);
}
void cancel()
{
mCanceled = true;
}
void onStart()
{
// stub
}
void onUpdate(float frac, float smoothFrac)
{
// stub
}
void onStop()
{
// stub
}
@Override
public void run()
{
if (mCanceled)
{
return;
}
float fraction = ((float) (SystemClock.uptimeMillis() - mStartTime)) / mDurationF;
if (fraction >= 1f)
{
onUpdate(1f, 1f);
onStop();
}
else
{
onUpdate(fraction, transform(fraction));
post(this);
}
}
}
/**
* Centers floating View over drop slot before destroying.
*/
private class DropAnimator extends SmoothAnimator
{
private int mDropPos;
private int srcPos;
private float mInitDeltaY;
private float mInitDeltaX;
DropAnimator(float smoothness, int duration)
{
super(smoothness, duration);
}
@Override
void onStart()
{
mDropPos = mFloatPos;
srcPos = mSrcPos;
mDragState = DROPPING;
mInitDeltaY = mFloatLoc.y - getTargetY();
mInitDeltaX = mFloatLoc.x - getPaddingLeft();
}
private int getTargetY()
{
final int first = getFirstVisiblePosition();
final int otherAdjust = (mItemHeightCollapsed + getDividerHeight()) / 2;
View v = getChildAt(mDropPos - first);
int targetY = -1;
if (v != null)
{
if (mDropPos == srcPos)
{
targetY = v.getTop();
}
else if (mDropPos < srcPos)
{
// expanded down
targetY = v.getTop() - otherAdjust;
}
else
{
// expanded up
targetY = v.getBottom() + otherAdjust - mFloatViewHeight;
}
}
else
{
// drop position is not on screen?? no animation
cancel();
}
return targetY;
}
@Override
void onUpdate(float frac, float smoothFrac)
{
final int targetY = getTargetY();
final int targetX = getPaddingLeft();
final float deltaY = mFloatLoc.y - targetY;
final float deltaX = mFloatLoc.x - targetX;
final float f = 1f - smoothFrac;
if (f < Math.abs(deltaY / mInitDeltaY) || f < Math.abs(deltaX / mInitDeltaX))
{
mFloatLoc.y = targetY + (int) (mInitDeltaY * f);
mFloatLoc.x = getPaddingLeft() + (int) (mInitDeltaX * f);
doDragFloatView(true);
}
}
@Override
void onStop()
{
dropFloatView();
}
}
/**
* Collapses expanded items.
*/
private class RemoveAnimator extends SmoothAnimator
{
private float mFloatLocX;
private float mFirstStartBlank;
private float mSecondStartBlank;
private int mFirstChildHeight = -1;
private int mSecondChildHeight = -1;
private int mFirstPos;
private int mSecondPos;
RemoveAnimator(float smoothness, int duration)
{
super(smoothness, duration);
}
@Override
void onStart()
{
mFirstChildHeight = -1;
mSecondChildHeight = -1;
mFirstPos = mFirstExpPos;
mSecondPos = mSecondExpPos;
mDragState = REMOVING;
mFloatLocX = mFloatLoc.x;
if (mUseRemoveVelocity)
{
float minVelocity = 2f * getWidth();
if (mRemoveVelocityX == 0)
{
mRemoveVelocityX = (mFloatLocX < 0 ? -1 : 1) * minVelocity;
}
else
{
minVelocity *= 2;
if (mRemoveVelocityX < 0 && mRemoveVelocityX > -minVelocity)
mRemoveVelocityX = -minVelocity;
else if (mRemoveVelocityX > 0 && mRemoveVelocityX < minVelocity)
mRemoveVelocityX = minVelocity;
}
}
else
{
destroyFloatView();
}
}
@Override
void onUpdate(float frac, float smoothFrac)
{
float f = 1f - smoothFrac;
final int firstVis = getFirstVisiblePosition();
View item = getChildAt(mFirstPos - firstVis);
ViewGroup.LayoutParams lp;
int blank;
if (mUseRemoveVelocity)
{
float dt = (float) (SystemClock.uptimeMillis() - mStartTime) / 1000;
if (dt == 0)
return;
float dx = mRemoveVelocityX * dt;
int w = getWidth();
mRemoveVelocityX += (mRemoveVelocityX > 0 ? 1 : -1) * dt * w;
mFloatLocX += dx;
mFloatLoc.x = (int) mFloatLocX;
if (mFloatLocX < w && mFloatLocX > -w)
{
mStartTime = SystemClock.uptimeMillis();
doDragFloatView(true);
return;
}
}
if (item != null)
{
if (mFirstChildHeight == -1)
{
mFirstChildHeight = getChildHeight(mFirstPos, item, false);
mFirstStartBlank = (float) (item.getHeight() - mFirstChildHeight);
}
blank = Math.max((int) (f * mFirstStartBlank), 1);
lp = item.getLayoutParams();
lp.height = mFirstChildHeight + blank;
item.setLayoutParams(lp);
}
if (mSecondPos != mFirstPos)
{
item = getChildAt(mSecondPos - firstVis);
if (item != null)
{
if (mSecondChildHeight == -1)
{
mSecondChildHeight = getChildHeight(mSecondPos, item, false);
mSecondStartBlank = (float) (item.getHeight() - mSecondChildHeight);
}
blank = Math.max((int) (f * mSecondStartBlank), 1);
lp = item.getLayoutParams();
lp.height = mSecondChildHeight + blank;
item.setLayoutParams(lp);
}
}
}
@Override
void onStop()
{
doRemoveItem();
}
}
void removeItem(int which)
{
mUseRemoveVelocity = false;
removeItem(which, 0);
}
/**
* Removes an item from the list and animates the removal.
*/
private void removeItem(int which, float velocityX)
{
if (mDragState == IDLE || mDragState == DRAGGING)
{
if (mDragState == IDLE)
{
// called from outside drag-sort
mSrcPos = getHeaderViewsCount() + which;
mFirstExpPos = mSrcPos;
mSecondExpPos = mSrcPos;
mFloatPos = mSrcPos;
View v = getChildAt(mSrcPos - getFirstVisiblePosition());
if (v != null)
{
v.setVisibility(View.INVISIBLE);
}
}
mDragState = REMOVING;
mRemoveVelocityX = velocityX;
if (mInTouchEvent)
{
switch (mCancelMethod)
{
case ON_TOUCH_EVENT:
super.onTouchEvent(mCancelEvent);
break;
case ON_INTERCEPT_TOUCH_EVENT:
super.onInterceptTouchEvent(mCancelEvent);
break;
}
}
if (mRemoveAnimator != null)
{
mRemoveAnimator.start();
}
else
{
doRemoveItem(which);
}
}
}
private void cancelDrag()
{
if (mDragState == DRAGGING)
{
mDragScroller.stopScrolling(true);
destroyFloatView();
clearPositions();
adjustAllItems();
if (mInTouchEvent)
{
mDragState = STOPPED;
}
else
{
mDragState = IDLE;
}
}
}
private void clearPositions()
{
mSrcPos = -1;
mFirstExpPos = -1;
mSecondExpPos = -1;
mFloatPos = -1;
}
private void dropFloatView()
{
// must set to avoid cancelDrag being called from the
// DataSetObserver
mDragState = DROPPING;
if (mDropListener != null && mFloatPos >= 0 && mFloatPos < getCount())
{
final int numHeaders = getHeaderViewsCount();
mDropListener.drop(mSrcPos - numHeaders, mFloatPos - numHeaders);
}
destroyFloatView();
adjustOnReorder();
clearPositions();
adjustAllItems();
// now the drag is done
if (mInTouchEvent)
{
mDragState = STOPPED;
}
else
{
mDragState = IDLE;
}
}
private void doRemoveItem()
{
doRemoveItem(mSrcPos - getHeaderViewsCount());
}
/**
* Removes dragged item from the list. Calls RemoveListener.
*/
private void doRemoveItem(int which)
{
// must set to avoid cancelDrag being called from the
// DataSetObserver
mDragState = REMOVING;
// end it
if (mRemoveListener != null)
{
mRemoveListener.remove(which);
}
destroyFloatView();
adjustOnReorder();
clearPositions();
// now the drag is done
if (mInTouchEvent)
{
mDragState = STOPPED;
}
else
{
mDragState = IDLE;
}
}
private void adjustOnReorder()
{
final int firstPos = getFirstVisiblePosition();
// Log.d("mobeta", "first="+firstPos+" src="+mSrcPos);
if (mSrcPos < firstPos)
{
// collapsed src item is off screen;
// adjust the scroll after item heights have been fixed
View v = getChildAt(0);
int top = 0;
if (v != null)
{
top = v.getTop();
}
// Log.d("mobeta", "top="+top+" fvh="+mFloatViewHeight);
setSelectionFromTop(firstPos - 1, top - getPaddingTop());
}
}
/**
* Stop a drag in progress. Pass <code>true</code> if you would
* like to remove the dragged item from the list.
*
* @param remove Remove the dragged item from the list. Calls
* a registered RemoveListener, if one exists. Otherwise, calls
* the DropListener, if one exists.
* @return True if the stop was successful. False if there is
* no floating View.
*/
private boolean stopDrag(boolean remove)
{
mUseRemoveVelocity = false;
return stopDrag(remove, 0);
}
boolean stopDragWithVelocity(boolean remove, float velocityX)
{
mUseRemoveVelocity = true;
return stopDrag(remove, velocityX);
}
private boolean stopDrag(boolean remove, float velocityX)
{
if (mFloatView != null)
{
mDragScroller.stopScrolling(true);
if (remove)
{
removeItem(mSrcPos - getHeaderViewsCount(), velocityX);
}
else
{
if (mDropAnimator != null)
{
mDropAnimator.start();
}
else
{
dropFloatView();
}
}
return true;
}
else
{
// stop failed
return false;
}
}
@Override
public boolean onTouchEvent(MotionEvent ev)
{
if (mIgnoreTouchEvent)
{
mIgnoreTouchEvent = false;
return false;
}
if (!mDragEnabled)
{
return super.onTouchEvent(ev);
}
boolean more = false;
boolean lastCallWasIntercept = mLastCallWasIntercept;
mLastCallWasIntercept = false;
if (!lastCallWasIntercept)
{
saveTouchCoords(ev);
}
// if (mFloatView != null) {
if (mDragState == DRAGGING)
{
onDragTouchEvent(ev);
more = true; // give us more!
}
else
{
// what if float view is null b/c we dropped in middle
// of drag touch event?
// if (mDragState != STOPPED) {
if (mDragState == IDLE)
{
if (super.onTouchEvent(ev))
{
more = true;
}
}
int action = ev.getAction() & MotionEvent.ACTION_MASK;
switch (action)
{
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
doActionUpOrCancel();
break;
default:
if (more)
{
mCancelMethod = ON_TOUCH_EVENT;
}
}
}
return more;
}
private void doActionUpOrCancel()
{
mCancelMethod = NO_CANCEL;
mInTouchEvent = false;
if (mDragState == STOPPED)
{
mDragState = IDLE;
}
mCurrFloatAlpha = mFloatAlpha;
mListViewIntercepted = false;
mChildHeightCache.clear();
}
private void saveTouchCoords(MotionEvent ev)
{
int action = ev.getAction() & MotionEvent.ACTION_MASK;
if (action != MotionEvent.ACTION_DOWN)
{
mLastY = mY;
}
mX = (int) ev.getX();
mY = (int) ev.getY();
if (action == MotionEvent.ACTION_DOWN)
{
mLastY = mY;
}
}
boolean listViewIntercepted()
{
return mListViewIntercepted;
}
private boolean mListViewIntercepted = false;
@Override
public boolean onInterceptTouchEvent(MotionEvent ev)
{
if (!mDragEnabled)
{
return super.onInterceptTouchEvent(ev);
}
saveTouchCoords(ev);
mLastCallWasIntercept = true;
int action = ev.getAction() & MotionEvent.ACTION_MASK;
if (action == MotionEvent.ACTION_DOWN)
{
if (mDragState != IDLE)
{
// intercept and ignore
mIgnoreTouchEvent = true;
return true;
}
mInTouchEvent = true;
}
boolean intercept = false;
// the following deals with calls to super.onInterceptTouchEvent
if (mFloatView != null)
{
// super's touch event canceled in startDrag
intercept = true;
}
else
{
if (super.onInterceptTouchEvent(ev))
{
mListViewIntercepted = true;
intercept = true;
}
switch (action)
{
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
doActionUpOrCancel();
break;
default:
if (intercept)
{
mCancelMethod = ON_TOUCH_EVENT;
}
else
{
mCancelMethod = ON_INTERCEPT_TOUCH_EVENT;
}
}
}
if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL)
{
mInTouchEvent = false;
}
return intercept;
}
/**
* Set the width of each drag scroll region by specifying
* a fraction of the ListView height.
*
* @param heightFraction Fraction of ListView height. Capped at
* 0.5f.
*/
private void setDragScrollStart(float heightFraction)
{
setDragScrollStarts(heightFraction, heightFraction);
}
/**
* Set the width of each drag scroll region by specifying
* a fraction of the ListView height.
*
* @param upperFrac Fraction of ListView height for up-scroll bound.
* Capped at 0.5f.
* @param lowerFrac Fraction of ListView height for down-scroll bound.
* Capped at 0.5f.
*/
private void setDragScrollStarts(float upperFrac, float lowerFrac)
{
if (lowerFrac > 0.5f)
{
mDragDownScrollStartFrac = 0.5f;
}
else
{
mDragDownScrollStartFrac = lowerFrac;
}
if (upperFrac > 0.5f)
{
mDragUpScrollStartFrac = 0.5f;
}
else
{
mDragUpScrollStartFrac = upperFrac;
}
if (getHeight() != 0)
{
updateScrollStarts();
}
}
private void continueDrag(int x, int y)
{
// proposed position
mFloatLoc.x = x - mDragDeltaX;
mFloatLoc.y = y - mDragDeltaY;
doDragFloatView(true);
int minY = Math.min(y, mFloatViewMid + mFloatViewHeightHalf);
int maxY = Math.max(y, mFloatViewMid - mFloatViewHeightHalf);
// get the current scroll direction
int currentScrollDir = mDragScroller.getScrollDir();
if (minY > mLastY && minY > mDownScrollStartY && currentScrollDir != DragScroller.DOWN)
{
// dragged down, it is below the down scroll start and it is not
// scrolling up
if (currentScrollDir != DragScroller.STOP)
{
// moved directly from up scroll to down scroll
mDragScroller.stopScrolling(true);
}
// start scrolling down
mDragScroller.startScrolling(DragScroller.DOWN);
}
else if (maxY < mLastY && maxY < mUpScrollStartY && currentScrollDir != DragScroller.UP)
{
// dragged up, it is above the up scroll start and it is not
// scrolling up
if (currentScrollDir != DragScroller.STOP)
{
// moved directly from down scroll to up scroll
mDragScroller.stopScrolling(true);
}
// start scrolling up
mDragScroller.startScrolling(DragScroller.UP);
}
else if (maxY >= mUpScrollStartY && minY <= mDownScrollStartY
&& mDragScroller.isScrolling())
{
// not in the upper nor in the lower drag-scroll regions but it is
// still scrolling
mDragScroller.stopScrolling(true);
}
}
private void updateScrollStarts()
{
final int padTop = getPaddingTop();
final int listHeight = getHeight() - padTop - getPaddingBottom();
float heightF = (float) listHeight;
mUpScrollStartYF = padTop + mDragUpScrollStartFrac * heightF;
mDownScrollStartYF = padTop + (1.0f - mDragDownScrollStartFrac) * heightF;
mUpScrollStartY = (int) mUpScrollStartYF;
mDownScrollStartY = (int) mDownScrollStartYF;
mDragUpScrollHeight = mUpScrollStartYF - padTop;
mDragDownScrollHeight = padTop + listHeight - mDownScrollStartYF;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh)
{
super.onSizeChanged(w, h, oldw, oldh);
updateScrollStarts();
}
private void adjustAllItems()
{
final int first = getFirstVisiblePosition();
final int last = getLastVisiblePosition();
int begin = Math.max(0, getHeaderViewsCount() - first);
int end = Math.min(last - first, getCount() - 1 - getFooterViewsCount() - first);
for (int i = begin; i <= end; ++i)
{
View v = getChildAt(i);
if (v != null)
{
adjustItem(first + i, v, false);
}
}
}
/**
* Sets layout param height, gravity, and visibility on
* wrapped item.
*/
private void adjustItem(int position, View v, boolean invalidChildHeight)
{
// Adjust item height
ViewGroup.LayoutParams lp = v.getLayoutParams();
int height;
if (position != mSrcPos && position != mFirstExpPos && position != mSecondExpPos)
{
height = ViewGroup.LayoutParams.WRAP_CONTENT;
}
else
{
height = calcItemHeight(position, v, invalidChildHeight);
}
if (height != lp.height)
{
lp.height = height;
v.setLayoutParams(lp);
}
// Adjust item gravity
if (position == mFirstExpPos || position == mSecondExpPos)
{
if (position < mSrcPos)
{
((DragSortItemView) v).setGravity(Gravity.BOTTOM);
}
else if (position > mSrcPos)
{
((DragSortItemView) v).setGravity(Gravity.TOP);
}
}
// Finally adjust item visibility
int oldVis = v.getVisibility();
int vis = View.VISIBLE;
if (position == mSrcPos && mFloatView != null)
{
vis = View.INVISIBLE;
}
if (vis != oldVis)
{
v.setVisibility(vis);
}
}
private int getChildHeight(int position)
{
if (position == mSrcPos)
{
return 0;
}
View v = getChildAt(position - getFirstVisiblePosition());
if (v != null)
{
// item is onscreen, therefore child height is valid,
// hence the "true"
return getChildHeight(position, v, false);
}
else
{
// item is offscreen
// first check cache for child height at this position
int childHeight = mChildHeightCache.get(position);
if (childHeight != -1)
{
// Log.d("mobeta", "found child height in cache!");
return childHeight;
}
final ListAdapter adapter = getAdapter();
int type = adapter.getItemViewType(position);
// There might be a better place for checking for the following
final int typeCount = adapter.getViewTypeCount();
if (typeCount != mSampleViewTypes.length)
{
mSampleViewTypes = new View[typeCount];
}
if (type >= 0)
{
if (mSampleViewTypes[type] == null)
{
v = adapter.getView(position, null, this);
mSampleViewTypes[type] = v;
}
else
{
v = adapter.getView(position, mSampleViewTypes[type], this);
}
}
else
{
// type is HEADER_OR_FOOTER or IGNORE
v = adapter.getView(position, null, this);
}
// current child height is invalid, hence "true" below
childHeight = getChildHeight(position, v, true);
// cache it because this could have been expensive
mChildHeightCache.add(position, childHeight);
return childHeight;
}
}
private int getChildHeight(int position, View item, boolean invalidChildHeight)
{
if (position == mSrcPos)
{
return 0;
}
View child;
if (position < getHeaderViewsCount() || position >= getCount() - getFooterViewsCount())
{
child = item;
}
else
{
child = ((ViewGroup) item).getChildAt(0);
}
ViewGroup.LayoutParams lp = child.getLayoutParams();
if (lp != null)
{
if (lp.height > 0)
{
return lp.height;
}
}
int childHeight = child.getHeight();
if (childHeight == 0 || invalidChildHeight)
{
measureItem(child);
childHeight = child.getMeasuredHeight();
}
return childHeight;
}
private int calcItemHeight(int position, View item, boolean invalidChildHeight)
{
return calcItemHeight(position, getChildHeight(position, item, invalidChildHeight));
}
private int calcItemHeight(int position, int childHeight)
{
boolean isSliding = mAnimate && mFirstExpPos != mSecondExpPos;
int maxNonSrcBlankHeight = mFloatViewHeight - mItemHeightCollapsed;
int slideHeight = (int) (mSlideFrac * maxNonSrcBlankHeight);
int height;
if (position == mSrcPos)
{
if (mSrcPos == mFirstExpPos)
{
if (isSliding)
{
height = slideHeight + mItemHeightCollapsed;
}
else
{
height = mFloatViewHeight;
}
}
else if (mSrcPos == mSecondExpPos)
{
// if gets here, we know an item is sliding
height = mFloatViewHeight - slideHeight;
}
else
{
height = mItemHeightCollapsed;
}
}
else if (position == mFirstExpPos)
{
if (isSliding)
{
height = childHeight + slideHeight;
}
else
{
height = childHeight + maxNonSrcBlankHeight;
}
}
else if (position == mSecondExpPos)
{
// we know an item is sliding (b/c 2ndPos != 1stPos)
height = childHeight + maxNonSrcBlankHeight - slideHeight;
}
else
{
height = childHeight;
}
return height;
}
@Override
public void requestLayout()
{
if (!mBlockLayoutRequests)
{
super.requestLayout();
}
}
private int adjustScroll(int movePos, View moveItem, int oldFirstExpPos, int oldSecondExpPos)
{
int adjust = 0;
final int childHeight = getChildHeight(movePos);
int moveHeightBefore = moveItem.getHeight();
int moveHeightAfter = calcItemHeight(movePos, childHeight);
int moveBlankBefore = moveHeightBefore;
int moveBlankAfter = moveHeightAfter;
if (movePos != mSrcPos)
{
moveBlankBefore -= childHeight;
moveBlankAfter -= childHeight;
}
int maxBlank = mFloatViewHeight;
if (mSrcPos != mFirstExpPos && mSrcPos != mSecondExpPos)
{
maxBlank -= mItemHeightCollapsed;
}
if (movePos <= oldFirstExpPos)
{
if (movePos > mFirstExpPos)
{
adjust += maxBlank - moveBlankAfter;
}
}
else if (movePos == oldSecondExpPos)
{
if (movePos <= mFirstExpPos)
{
adjust += moveBlankBefore - maxBlank;
}
else if (movePos == mSecondExpPos)
{
adjust += moveHeightBefore - moveHeightAfter;
}
else
{
adjust += moveBlankBefore;
}
}
else
{
if (movePos <= mFirstExpPos)
{
adjust -= maxBlank;
}
else if (movePos == mSecondExpPos)
{
adjust -= moveBlankAfter;
}
}
return adjust;
}
private void measureItem(View item)
{
ViewGroup.LayoutParams lp = item.getLayoutParams();
if (lp == null)
{
lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
item.setLayoutParams(lp);
}
int wspec = ViewGroup.getChildMeasureSpec(mWidthMeasureSpec, getListPaddingLeft()
+ getListPaddingRight(), lp.width);
int hspec;
if (lp.height > 0)
{
hspec = MeasureSpec.makeMeasureSpec(lp.height, MeasureSpec.EXACTLY);
}
else
{
hspec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
}
item.measure(wspec, hspec);
}
private void measureFloatView()
{
if (mFloatView != null)
{
measureItem(mFloatView);
mFloatViewHeight = mFloatView.getMeasuredHeight();
mFloatViewHeightHalf = mFloatViewHeight / 2;
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// Log.d("mobeta", "onMeasure called");
if (mFloatView != null)
{
if (mFloatView.isLayoutRequested())
{
measureFloatView();
}
mFloatViewOnMeasured = true; // set to false after layout
}
mWidthMeasureSpec = widthMeasureSpec;
}
@Override
protected void layoutChildren()
{
super.layoutChildren();
if (mFloatView != null)
{
if (mFloatView.isLayoutRequested() && !mFloatViewOnMeasured)
{
// Have to measure here when usual android measure
// pass is skipped. This happens during a drag-sort
// when layoutChildren is called directly.
measureFloatView();
}
mFloatView.layout(0, 0, mFloatView.getMeasuredWidth(), mFloatView.getMeasuredHeight());
mFloatViewOnMeasured = false;
}
}
private void onDragTouchEvent(MotionEvent ev)
{
switch (ev.getAction() & MotionEvent.ACTION_MASK)
{
case MotionEvent.ACTION_CANCEL:
if (mDragState == DRAGGING)
{
cancelDrag();
}
doActionUpOrCancel();
break;
case MotionEvent.ACTION_UP:
// Log.d("mobeta", "calling stopDrag from onDragTouchEvent");
if (mDragState == DRAGGING)
{
stopDrag(false);
}
doActionUpOrCancel();
break;
case MotionEvent.ACTION_MOVE:
continueDrag((int) ev.getX(), (int) ev.getY());
break;
}
}
/**
* Start a drag of item at <code>position</code> using the
* registered FloatViewManager. Calls through
* to {@link #startDrag(int, View, int, int, int)} after obtaining
* the floating View from the FloatViewManager.
*
* @param position Item to drag.
* @param dragFlags Flags that restrict some movements of the
* floating View. For example, set <code>dragFlags |=
* ~{@link #DRAG_NEG_X}</code> to allow dragging the floating
* View in all directions except off the screen to the left.
* @param deltaX Offset in x of the touch coordinate from the
* left edge of the floating View (i.e. touch-x minus float View
* left).
* @param deltaY Offset in y of the touch coordinate from the
* top edge of the floating View (i.e. touch-y minus float View
* top).
* @return True if the drag was started, false otherwise. This
* <code>startDrag</code> will fail if we are not currently in
* a touch event, there is no registered FloatViewManager,
* or the FloatViewManager returns a null View.
*/
boolean startDrag(int position, int dragFlags, int deltaX, int deltaY)
{
if (!mInTouchEvent || mFloatViewManager == null)
{
return false;
}
View v = mFloatViewManager.onCreateFloatView(position);
if (v == null)
{
return false;
}
else
{
return startDrag(position, v, dragFlags, deltaX, deltaY);
}
}
/**
* Start a drag of item at <code>position</code> without using
* a FloatViewManager.
*
* @param position Item to drag.
* @param floatView Floating View.
* @param dragFlags Flags that restrict some movements of the
* floating View. For example, set <code>dragFlags |=
* ~{@link #DRAG_NEG_X}</code> to allow dragging the floating
* View in all directions except off the screen to the left.
* @param deltaX Offset in x of the touch coordinate from the
* left edge of the floating View (i.e. touch-x minus float View
* left).
* @param deltaY Offset in y of the touch coordinate from the
* top edge of the floating View (i.e. touch-y minus float View
* top).
* @return True if the drag was started, false otherwise. This
* <code>startDrag</code> will fail if we are not currently in
* a touch event, <code>floatView</code> is null, or there is
* a drag in progress.
*/
private boolean startDrag(int position, View floatView, int dragFlags, int deltaX, int deltaY)
{
if (mDragState != IDLE || !mInTouchEvent || mFloatView != null || floatView == null
|| !mDragEnabled)
{
return false;
}
if (getParent() != null)
{
getParent().requestDisallowInterceptTouchEvent(true);
}
int pos = position + getHeaderViewsCount();
mFirstExpPos = pos;
mSecondExpPos = pos;
mSrcPos = pos;
mFloatPos = pos;
// mDragState = dragType;
mDragState = DRAGGING;
mDragFlags = 0;
mDragFlags |= dragFlags;
mFloatView = floatView;
measureFloatView(); // sets mFloatViewHeight
mDragDeltaX = deltaX;
mDragDeltaY = deltaY;
// updateFloatView(mX - mDragDeltaX, mY - mDragDeltaY);
mFloatLoc.x = mX - mDragDeltaX;
mFloatLoc.y = mY - mDragDeltaY;
// set src item invisible
final View srcItem = getChildAt(mSrcPos - getFirstVisiblePosition());
if (srcItem != null)
{
srcItem.setVisibility(View.INVISIBLE);
}
// once float view is created, events are no longer passed
// to ListView
switch (mCancelMethod)
{
case ON_TOUCH_EVENT:
super.onTouchEvent(mCancelEvent);
break;
case ON_INTERCEPT_TOUCH_EVENT:
super.onInterceptTouchEvent(mCancelEvent);
break;
}
requestLayout();
return true;
}
private void doDragFloatView(boolean forceInvalidate)
{
int movePos = getFirstVisiblePosition() + getChildCount() / 2;
View moveItem = getChildAt(getChildCount() / 2);
if (moveItem == null)
{
return;
}
doDragFloatView(movePos, moveItem, forceInvalidate);
}
private void doDragFloatView(int movePos, View moveItem, boolean forceInvalidate)
{
mBlockLayoutRequests = true;
updateFloatView();
int oldFirstExpPos = mFirstExpPos;
int oldSecondExpPos = mSecondExpPos;
boolean updated = updatePositions();
if (updated)
{
adjustAllItems();
int scroll = adjustScroll(movePos, moveItem, oldFirstExpPos, oldSecondExpPos);
// Log.d("mobeta", " adjust scroll="+scroll);
setSelectionFromTop(movePos, moveItem.getTop() + scroll - getPaddingTop());
layoutChildren();
}
if (updated || forceInvalidate)
{
invalidate();
}
mBlockLayoutRequests = false;
}
/**
* Sets float View location based on suggested values and
* constraints set in mDragFlags.
*/
private void updateFloatView()
{
if (mFloatViewManager != null)
{
mTouchLoc.set(mX, mY);
mFloatViewManager.onDragFloatView(mFloatView, mFloatLoc, mTouchLoc);
}
final int floatX = mFloatLoc.x;
final int floatY = mFloatLoc.y;
// restrict x motion
int padLeft = getPaddingLeft();
if ((mDragFlags & DRAG_POS_X) == 0 && floatX > padLeft)
{
mFloatLoc.x = padLeft;
}
else if ((mDragFlags & DRAG_NEG_X) == 0 && floatX < padLeft)
{
mFloatLoc.x = padLeft;
}
// keep floating view from going past bottom of last header view
final int numHeaders = getHeaderViewsCount();
final int numFooters = getFooterViewsCount();
final int firstPos = getFirstVisiblePosition();
final int lastPos = getLastVisiblePosition();
// Log.d("mobeta",
// "nHead="+numHeaders+" nFoot="+numFooters+" first="+firstPos+" last="+lastPos);
int topLimit = getPaddingTop();
if (firstPos < numHeaders)
{
topLimit = getChildAt(numHeaders - firstPos - 1).getBottom();
}
if ((mDragFlags & DRAG_NEG_Y) == 0)
{
if (firstPos <= mSrcPos)
{
topLimit = Math.max(getChildAt(mSrcPos - firstPos).getTop(), topLimit);
}
}
// bottom limit is top of first footer View or
// bottom of last item in list
int bottomLimit = getHeight() - getPaddingBottom();
if (lastPos >= getCount() - numFooters - 1)
{
bottomLimit = getChildAt(getCount() - numFooters - 1 - firstPos).getBottom();
}
if ((mDragFlags & DRAG_POS_Y) == 0)
{
if (lastPos >= mSrcPos)
{
bottomLimit = Math.min(getChildAt(mSrcPos - firstPos).getBottom(), bottomLimit);
}
}
// Log.d("mobeta", "dragView top=" + (y - mDragDeltaY));
// Log.d("mobeta", "limit=" + limit);
// Log.d("mobeta", "mDragDeltaY=" + mDragDeltaY);
if (floatY < topLimit)
{
mFloatLoc.y = topLimit;
}
else if (floatY + mFloatViewHeight > bottomLimit)
{
mFloatLoc.y = bottomLimit - mFloatViewHeight;
}
// get y-midpoint of floating view (constrained to ListView bounds)
mFloatViewMid = mFloatLoc.y + mFloatViewHeightHalf;
}
private void destroyFloatView()
{
if (mFloatView != null)
{
mFloatView.setVisibility(GONE);
if (mFloatViewManager != null)
{
mFloatViewManager.onDestroyFloatView(mFloatView);
}
mFloatView = null;
invalidate();
}
}
/**
* Interface for customization of the floating View appearance
* and dragging behavior.
*/
interface FloatViewManager
{
/**
* Return the floating View for item at <code>position</code>.
* DragSortListView will measure and layout this View for you,
* so feel free to just inflate it. You can help DSLV by
* setting some {@link ViewGroup.LayoutParams} on this View;
* otherwise it will set some for you (with a width of FILL_PARENT
* and a height of WRAP_CONTENT).
*
* @param position Position of item to drag (NOTE:
* <code>position</code> excludes header Views; thus, if you
* want to call {@link ListView#getChildAt(int)}, you will need
* to add {@link ListView#getHeaderViewsCount()} to the index).
* @return The View you wish to display as the floating View.
*/
View onCreateFloatView(int position);
/**
* Called whenever the floating View is dragged. Float View
* properties can be changed here. Also, the upcoming location
* of the float View can be altered by setting
* <code>location.x</code> and <code>location.y</code>.
*
* @param floatView The floating View.
* @param location The location (top-left; relative to DSLV
* top-left) at which the float
* View would like to appear, given the current touch location
* and the offset provided in {@link DragSortListView#startDrag}.
* @param touch The current touch location (relative to DSLV
* top-left).
*/
void onDragFloatView(View floatView, Point location, Point touch);
/**
* Called when the float View is dropped; lets you perform
* any necessary cleanup. The internal DSLV floating View
* reference is set to null immediately after this is called.
*
* @param floatView The floating View passed to
* {@link #onCreateFloatView(int)}.
*/
void onDestroyFloatView(View floatView);
/**
* Register a class which will get onTouch events.
*/
void setSecondaryOnTouchListener(View.OnTouchListener l);
}
private void setDragListener(DragListener l)
{
mDragListener = l;
}
boolean isDragEnabled()
{
return mDragEnabled;
}
public void setDropListener(DropListener l)
{
mDropListener = l;
}
/**
* Probably a no-brainer, but make sure that your remove listener
* calls {@link BaseAdapter#notifyDataSetChanged()} or something like it.
* When an item removal occurs, DragSortListView
* relies on a redraw of all the items to recover invisible views
* and such. Strictly speaking, if you remove something, your dataset
* has changed...
*/
private void setRemoveListener(RemoveListener l)
{
mRemoveListener = l;
}
interface DragListener
{
void drag(int from, int to);
}
/**
* Your implementation of this has to reorder your ListAdapter!
* Make sure to call
* {@link BaseAdapter#notifyDataSetChanged()} or something like it
* in your implementation.
*
* @author heycosmo
*/
public interface DropListener
{
void drop(int from, int to);
}
/**
* Make sure to call
* {@link BaseAdapter#notifyDataSetChanged()} or something like it
* in your implementation.
*
* @author heycosmo
*/
interface RemoveListener
{
void remove(int which);
}
/**
* Interface for controlling
* scroll speed as a function of touch position and time.
*/
interface DragScrollProfile
{
/**
* Return a scroll speed in pixels/millisecond. Always return a
* positive number.
*
* @param w Normalized position in scroll region (i.e. w \in [0,1]).
* Small w typically means slow scrolling.
* @param t Time (in milliseconds) since start of scroll (handy if you
* want scroll acceleration).
* @return Scroll speed at position w and time t in pixels/ms.
*/
float getSpeed(float w, long t);
}
private class DragScroller implements Runnable
{
private boolean mAbort;
private long mPrevTime;
private long mCurrTime;
private int dy;
private float dt;
private long tStart;
private int scrollDir;
final static int STOP = -1;
final static int UP = 0;
final static int DOWN = 1;
private float mScrollSpeed; // pixels per ms
private boolean mScrolling = false;
boolean isScrolling()
{
return mScrolling;
}
int getScrollDir()
{
return mScrolling ? scrollDir : STOP;
}
DragScroller()
{
}
void startScrolling(int dir)
{
if (!mScrolling)
{
// Debug.startMethodTracing("dslv-scroll");
mAbort = false;
mScrolling = true;
tStart = SystemClock.uptimeMillis();
mPrevTime = tStart;
scrollDir = dir;
post(this);
}
}
void stopScrolling(boolean now)
{
if (now)
{
DragSortListView.this.removeCallbacks(this);
mScrolling = false;
}
else
{
mAbort = true;
}
// Debug.stopMethodTracing();
}
@Override
public void run()
{
if (mAbort)
{
mScrolling = false;
return;
}
// Log.d("mobeta", "scroll");
final int first = getFirstVisiblePosition();
final int last = getLastVisiblePosition();
final int count = getCount();
final int padTop = getPaddingTop();
final int listHeight = getHeight() - padTop - getPaddingBottom();
int minY = Math.min(mY, mFloatViewMid + mFloatViewHeightHalf);
int maxY = Math.max(mY, mFloatViewMid - mFloatViewHeightHalf);
if (scrollDir == UP)
{
View v = getChildAt(0);
// Log.d("mobeta", "vtop="+v.getTop()+" padtop="+padTop);
if (v == null)
{
mScrolling = false;
return;
}
else
{
if (first == 0 && v.getTop() == padTop)
{
mScrolling = false;
return;
}
}
mScrollSpeed = mScrollProfile.getSpeed((mUpScrollStartYF - maxY)
/ mDragUpScrollHeight, mPrevTime);
}
else
{
View v = getChildAt(last - first);
if (v == null)
{
mScrolling = false;
return;
}
else
{
if (last == count - 1 && v.getBottom() <= listHeight + padTop)
{
mScrolling = false;
return;
}
}
mScrollSpeed = -mScrollProfile.getSpeed((minY - mDownScrollStartYF)
/ mDragDownScrollHeight, mPrevTime);
}
mCurrTime = SystemClock.uptimeMillis();
dt = (float) (mCurrTime - mPrevTime);
// dy is change in View position of a list item; i.e. positive dy
// means user is scrolling up (list item moves down the screen,
// remember
// y=0 is at top of View).
dy = Math.round(mScrollSpeed * dt);
int movePos;
if (dy >= 0)
{
dy = Math.min(listHeight, dy);
movePos = first;
}
else
{
dy = Math.max(-listHeight, dy);
movePos = last;
}
final View moveItem = getChildAt(movePos - first);
int top = moveItem.getTop() + dy;
if (movePos == 0 && top > padTop)
{
top = padTop;
}
// always do scroll
mBlockLayoutRequests = true;
setSelectionFromTop(movePos, top - padTop);
DragSortListView.this.layoutChildren();
invalidate();
mBlockLayoutRequests = false;
// scroll means relative float View movement
doDragFloatView(movePos, moveItem, false);
mPrevTime = mCurrTime;
// Log.d("mobeta", " updated prevTime="+mPrevTime);
post(this);
}
}
}
