/*
* Copyright (c) 2014. Marshal Chen.
*/
package com.marshalchen.common.uimodule.dragSortListView;
import android.graphics.Point;
import android.view.*;
import android.widget.AdapterView;
/**
* Class that starts and stops item drags on a {@link DragSortListView}
* based on touch gestures. This class also inherits from
* {@link SimpleFloatViewManager}, which provides basic float View
* creation.
*
* An instance of this class is meant to be passed to the methods
* {@link DragSortListView#setTouchListener()} and
* {@link DragSortListView#setFloatViewManager()} of your
* {@link DragSortListView} instance.
*/
public class DragSortController extends SimpleFloatViewManager implements View.OnTouchListener, GestureDetector.OnGestureListener {
/**
* Drag init mode enum.
*/
public static final int ON_DOWN = 0;
public static final int ON_DRAG = 1;
public static final int ON_LONG_PRESS = 2;
private int mDragInitMode = ON_DOWN;
private boolean mSortEnabled = true;
/**
* Remove mode enum.
*/
public static final int CLICK_REMOVE = 0;
public static final int FLING_REMOVE = 1;
/**
* The current remove mode.
*/
private int mRemoveMode;
private boolean mRemoveEnabled = false;
private boolean mIsRemoving = false;
private GestureDetector mDetector;
private GestureDetector mFlingRemoveDetector;
private int mTouchSlop;
public static final int MISS = -1;
private int mHitPos = MISS;
private int mFlingHitPos = MISS;
private int mClickRemoveHitPos = MISS;
private int[] mTempLoc = new int[2];
private int mItemX;
private int mItemY;
private int mCurrX;
private int mCurrY;
private boolean mDragging = false;
private float mFlingSpeed = 500f;
private int mDragHandleId;
private int mClickRemoveId;
private int mFlingHandleId;
private boolean mCanDrag;
private DragSortListView mDslv;
private int mPositionX;
/**
* Calls {@link #DragSortController(DragSortListView, int)} with a
* 0 drag handle id, FLING_RIGHT_REMOVE remove mode,
* and ON_DOWN drag init. By default, sorting is enabled, and
* removal is disabled.
*
* @param dslv The DSLV instance
*/
public DragSortController(DragSortListView dslv) {
this(dslv, 0, ON_DOWN, FLING_REMOVE);
}
public DragSortController(DragSortListView dslv, int dragHandleId, int dragInitMode, int removeMode) {
this(dslv, dragHandleId, dragInitMode, removeMode, 0);
}
public DragSortController(DragSortListView dslv, int dragHandleId, int dragInitMode, int removeMode, int clickRemoveId) {
this(dslv, dragHandleId, dragInitMode, removeMode, clickRemoveId, 0);
}
/**
* By default, sorting is enabled, and removal is disabled.
*
* @param dslv The DSLV instance
* @param dragHandleId The resource id of the View that represents
* the drag handle in a list item.
*/
public DragSortController(DragSortListView dslv, int dragHandleId, int dragInitMode,
int removeMode, int clickRemoveId, int flingHandleId) {
super(dslv);
mDslv = dslv;
mDetector = new GestureDetector(dslv.getContext(), this);
mFlingRemoveDetector = new GestureDetector(dslv.getContext(), mFlingRemoveListener);
mFlingRemoveDetector.setIsLongpressEnabled(false);
mTouchSlop = ViewConfiguration.get(dslv.getContext()).getScaledTouchSlop();
mDragHandleId = dragHandleId;
mClickRemoveId = clickRemoveId;
mFlingHandleId = flingHandleId;
setRemoveMode(removeMode);
setDragInitMode(dragInitMode);
}
public int getDragInitMode() {
return mDragInitMode;
}
/**
* Set how a drag is initiated. Needs to be one of
* {@link ON_DOWN}, {@link ON_DRAG}, or {@link ON_LONG_PRESS}.
*
* @param mode The drag init mode.
*/
public void setDragInitMode(int mode) {
mDragInitMode = mode;
}
/**
* Enable/Disable list item sorting. Disabling is useful if only item
* removal is desired. Prevents drags in the vertical direction.
*
* @param enabled Set <code>true</code> to enable list
* item sorting.
*/
public void setSortEnabled(boolean enabled) {
mSortEnabled = enabled;
}
public boolean isSortEnabled() {
return mSortEnabled;
}
/**
* One of {@link CLICK_REMOVE}, {@link FLING_RIGHT_REMOVE},
* {@link FLING_LEFT_REMOVE},
* {@link SLIDE_RIGHT_REMOVE}, or {@link SLIDE_LEFT_REMOVE}.
*/
public void setRemoveMode(int mode) {
mRemoveMode = mode;
}
public int getRemoveMode() {
return mRemoveMode;
}
/**
* Enable/Disable item removal without affecting remove mode.
*/
public void setRemoveEnabled(boolean enabled) {
mRemoveEnabled = enabled;
}
public boolean isRemoveEnabled() {
return mRemoveEnabled;
}
/**
* Set the resource id for the View that represents the drag
* handle in a list item.
*
* @param id An android resource id.
*/
public void setDragHandleId(int id) {
mDragHandleId = id;
}
/**
* Set the resource id for the View that represents the fling
* handle in a list item.
*
* @param id An android resource id.
*/
public void setFlingHandleId(int id) {
mFlingHandleId = id;
}
/**
* Set the resource id for the View that represents click
* removal button.
*
* @param id An android resource id.
*/
public void setClickRemoveId(int id) {
mClickRemoveId = id;
}
/**
* Sets flags to restrict certain motions of the floating View
* based on DragSortController settings (such as remove mode).
* Starts the drag on the DragSortListView.
*
* @param position The list item position (includes headers).
* @param deltaX Touch x-coord minus left edge of floating View.
* @param deltaY Touch y-coord minus top edge of floating View.
*
* @return True if drag started, false otherwise.
*/
public boolean startDrag(int position, int deltaX, int deltaY) {
int dragFlags = 0;
if (mSortEnabled && !mIsRemoving) {
dragFlags |= DragSortListView.DRAG_POS_Y | DragSortListView.DRAG_NEG_Y;
}
if (mRemoveEnabled && mIsRemoving) {
dragFlags |= DragSortListView.DRAG_POS_X;
dragFlags |= DragSortListView.DRAG_NEG_X;
}
mDragging = mDslv.startDrag(position - mDslv.getHeaderViewsCount(), dragFlags, deltaX,
deltaY);
return mDragging;
}
@Override
public boolean onTouch(View v, MotionEvent ev) {
if (!mDslv.isDragEnabled() || mDslv.listViewIntercepted()) {
return false;
}
mDetector.onTouchEvent(ev);
if (mRemoveEnabled && mDragging && mRemoveMode == FLING_REMOVE) {
mFlingRemoveDetector.onTouchEvent(ev);
}
int action = ev.getAction() & MotionEvent.ACTION_MASK;
switch (action) {
case MotionEvent.ACTION_DOWN:
mCurrX = (int) ev.getX();
mCurrY = (int) ev.getY();
break;
case MotionEvent.ACTION_UP:
if (mRemoveEnabled && mIsRemoving) {
int x = mPositionX >= 0 ? mPositionX : -mPositionX;
int removePoint = mDslv.getWidth() / 2;
if (x > removePoint) {
mDslv.stopDragWithVelocity(true, 0);
}
}
case MotionEvent.ACTION_CANCEL:
mIsRemoving = false;
mDragging = false;
break;
}
return false;
}
/**
* Overrides to provide fading when slide removal is enabled.
*/
@Override
public void onDragFloatView(View floatView, Point position, Point touch) {
if (mRemoveEnabled && mIsRemoving) {
mPositionX = position.x;
}
}
/**
* Get the position to start dragging based on the ACTION_DOWN
* MotionEvent. This function simply calls
* {@link #dragHandleHitPosition(android.view.MotionEvent)}. Override
* to change drag handle behavior;
* this function is called internally when an ACTION_DOWN
* event is detected.
*
* @param ev The ACTION_DOWN MotionEvent.
*
* @return The list position to drag if a drag-init gesture is
* detected; MISS if unsuccessful.
*/
public int startDragPosition(MotionEvent ev) {
return dragHandleHitPosition(ev);
}
public int startFlingPosition(MotionEvent ev) {
return mRemoveMode == FLING_REMOVE ? flingHandleHitPosition(ev) : MISS;
}
/**
* Checks for the touch of an item's drag handle (specified by
* {@link #setDragHandleId(int)}), and returns that item's position
* if a drag handle touch was detected.
*
* @param ev The ACTION_DOWN MotionEvent.
* @return The list position of the item whose drag handle was
* touched; MISS if unsuccessful.
*/
public int dragHandleHitPosition(MotionEvent ev) {
return viewIdHitPosition(ev, mDragHandleId);
}
public int flingHandleHitPosition(MotionEvent ev) {
return viewIdHitPosition(ev, mFlingHandleId);
}
public int viewIdHitPosition(MotionEvent ev, int id) {
final int x = (int) ev.getX();
final int y = (int) ev.getY();
int touchPos = mDslv.pointToPosition(x, y); // includes headers/footers
final int numHeaders = mDslv.getHeaderViewsCount();
final int numFooters = mDslv.getFooterViewsCount();
final int count = mDslv.getCount();
// Log.d("mobeta", "touch down on position " + itemnum);
// We're only interested if the touch was on an
// item that's not a header or footer.
if (touchPos != AdapterView.INVALID_POSITION && touchPos >= numHeaders
&& touchPos < (count - numFooters)) {
final View item = mDslv.getChildAt(touchPos - mDslv.getFirstVisiblePosition());
final int rawX = (int) ev.getRawX();
final int rawY = (int) ev.getRawY();
View dragBox = id == 0 ? item : (View) item.findViewById(id);
if (dragBox != null) {
dragBox.getLocationOnScreen(mTempLoc);
if (rawX > mTempLoc[0] && rawY > mTempLoc[1] &&
rawX < mTempLoc[0] + dragBox.getWidth() &&
rawY < mTempLoc[1] + dragBox.getHeight()) {
mItemX = item.getLeft();
mItemY = item.getTop();
return touchPos;
}
}
}
return MISS;
}
@Override
public boolean onDown(MotionEvent ev) {
if (mRemoveEnabled && mRemoveMode == CLICK_REMOVE) {
mClickRemoveHitPos = viewIdHitPosition(ev, mClickRemoveId);
}
mHitPos = startDragPosition(ev);
if (mHitPos != MISS && mDragInitMode == ON_DOWN) {
startDrag(mHitPos, (int) ev.getX() - mItemX, (int) ev.getY() - mItemY);
}
mIsRemoving = false;
mCanDrag = true;
mPositionX = 0;
mFlingHitPos = startFlingPosition(ev);
return true;
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
final int x1 = (int) e1.getX();
final int y1 = (int) e1.getY();
final int x2 = (int) e2.getX();
final int y2 = (int) e2.getY();
final int deltaX = x2 - mItemX;
final int deltaY = y2 - mItemY;
if (mCanDrag && !mDragging && (mHitPos != MISS || mFlingHitPos != MISS)) {
if (mHitPos != MISS) {
if (mDragInitMode == ON_DRAG && Math.abs(y2 - y1) > mTouchSlop && mSortEnabled) {
startDrag(mHitPos, deltaX, deltaY);
}
else if (mDragInitMode != ON_DOWN && Math.abs(x2 - x1) > mTouchSlop && mRemoveEnabled)
{
mIsRemoving = true;
startDrag(mFlingHitPos, deltaX, deltaY);
}
} else if (mFlingHitPos != MISS) {
if (Math.abs(x2 - x1) > mTouchSlop && mRemoveEnabled) {
mIsRemoving = true;
startDrag(mFlingHitPos, deltaX, deltaY);
} else if (Math.abs(y2 - y1) > mTouchSlop) {
mCanDrag = false; // if started to scroll the list then
// don't allow sorting nor fling-removing
}
}
}
// return whatever
return false;
}
@Override
public void onLongPress(MotionEvent e) {
// Log.d("mobeta", "lift listener long pressed");
if (mHitPos != MISS && mDragInitMode == ON_LONG_PRESS) {
mDslv.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
startDrag(mHitPos, mCurrX - mItemX, mCurrY - mItemY);
}
}
// complete the OnGestureListener interface
@Override
public final boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
return false;
}
// complete the OnGestureListener interface
@Override
public boolean onSingleTapUp(MotionEvent ev) {
if (mRemoveEnabled && mRemoveMode == CLICK_REMOVE) {
if (mClickRemoveHitPos != MISS) {
mDslv.removeItem(mClickRemoveHitPos - mDslv.getHeaderViewsCount());
}
}
return true;
}
// complete the OnGestureListener interface
@Override
public void onShowPress(MotionEvent ev) {
// do nothing
}
private GestureDetector.OnGestureListener mFlingRemoveListener =
new GestureDetector.SimpleOnGestureListener() {
@Override
public final boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
// Log.d("mobeta", "on fling remove called");
if (mRemoveEnabled && mIsRemoving) {
int w = mDslv.getWidth();
int minPos = w / 5;
if (velocityX > mFlingSpeed) {
if (mPositionX > -minPos) {
mDslv.stopDragWithVelocity(true, velocityX);
}
} else if (velocityX < -mFlingSpeed) {
if (mPositionX < minPos) {
mDslv.stopDragWithVelocity(true, velocityX);
}
}
mIsRemoving = false;
}
return false;
}
};
}