mirror of https://github.com/tasks/tasks
Add a new class, draggable list view, for dragging and scrolling from same view
Tim Su
14 years ago
parent
57f3a70089
commit
205dd7ac78
@ -0,0 +1,560 @@
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/*
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* Copyright (c) 2010 CommonsWare, LLC
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* Portions Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.todoroo.astrid.ui;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Bitmap;
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import android.graphics.PixelFormat;
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import android.graphics.Rect;
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import android.os.Vibrator;
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import android.util.AttributeSet;
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import android.view.GestureDetector;
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import android.view.Gravity;
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import android.view.MotionEvent;
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import android.view.View;
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import android.view.ViewConfiguration;
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import android.view.ViewGroup;
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import android.view.WindowManager;
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import android.widget.AdapterView;
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import android.widget.ImageView;
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import android.widget.ListView;
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import com.commonsware.cwac.tlv.TouchListView.DragListener;
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import com.commonsware.cwac.tlv.TouchListView.DropListener;
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import com.commonsware.cwac.tlv.TouchListView.GrabberClickListener;
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import com.commonsware.cwac.tlv.TouchListView.SwipeListener;
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import com.timsu.astrid.R;
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public class DraggableListView extends ListView {
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private static final int SWIPE_THRESHOLD = 20;
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private static final int MOVEMENT_THRESHOLD = 10;
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// --- drag status
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private float mTouchStartX, mTouchCurrentX, mTouchStartY, mTouchCurrentY;
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private boolean mDragging = false;
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private int mDragPos; // which item is being dragged
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private int mFirstDragPos; // where was the dragged item originally
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private int mDragPoint; // at what offset inside the item did the user grab it
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private int mCoordOffset; // the difference between screen coordinates and coordinates in this view
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// --- drag drawing
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private ImageView mDragView;
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private WindowManager mWindowManager;
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private WindowManager.LayoutParams mWindowParams;
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private int mUpperBound;
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private int mLowerBound;
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private int mHeight;
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private int mRemoveMode = -1;
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private final Rect mTempRect = new Rect();
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private Bitmap mDragBitmap;
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private final int mTouchSlop;
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private int dragndropBackgroundColor = 0x00000000;
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// --- listeners
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private DragListener mDragListener;
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private DropListener mDropListener;
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private SwipeListener mSwipeListener;
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private GrabberClickListener mClickListener;
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private GestureDetector mGestureDetector;
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public static final int FLING = 0;
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public static final int SLIDE_RIGHT = 1;
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public static final int SLIDE_LEFT = 2;
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// --- other instance variables
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private int mItemHeightNormal = -1;
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private int mItemHeightExpanded = -1;
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private Thread dragThread = null;
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// --- constructors
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public DraggableListView(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public DraggableListView(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
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if (attrs != null) {
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TypedArray a = getContext().obtainStyledAttributes(attrs,
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R.styleable.TouchListView, 0, 0);
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mItemHeightNormal = a.getDimensionPixelSize(
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R.styleable.TouchListView_normal_height, 0);
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mItemHeightExpanded = a.getDimensionPixelSize(
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R.styleable.TouchListView_expanded_height,
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mItemHeightNormal);
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dragndropBackgroundColor = a.getColor(
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R.styleable.TouchListView_dragndrop_background, 0x00000000);
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mRemoveMode = a.getInt(R.styleable.TouchListView_remove_mode, -1);
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a.recycle();
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}
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}
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protected boolean isDraggableRow(@SuppressWarnings("unused") View view) {
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return true;
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}
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/*
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* pointToPosition() doesn't consider invisible views, but we need to, so
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* implement a slightly different version.
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*/
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private int myPointToPosition(int x, int y) {
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Rect frame = mTempRect;
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final int count = getChildCount();
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for (int i = count - 1; i >= 0; i--) {
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final View child = getChildAt(i);
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child.getHitRect(frame);
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if (frame.contains(x, y)) {
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return getFirstVisiblePosition() + i;
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}
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}
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return INVALID_POSITION;
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}
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private int getItemForPosition(int y) {
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int adjustedy = y - mDragPoint - (mItemHeightNormal / 2);
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int pos = myPointToPosition(0, adjustedy);
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if (pos >= 0) {
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if (pos <= mFirstDragPos) {
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pos += 1;
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}
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} else if (adjustedy < 0) {
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pos = 0;
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}
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return pos;
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}
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private void adjustScrollBounds(int y) {
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if (y >= mHeight / 3) {
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mUpperBound = mHeight / 3;
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}
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if (y <= mHeight * 2 / 3) {
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mLowerBound = mHeight * 2 / 3;
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}
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}
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/*
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* Restore size and visibility for all list items
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*/
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private void unExpandViews(boolean deletion) {
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for (int i = 0;; i++) {
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View v = getChildAt(i);
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if (v == null) {
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if (deletion) {
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// HACK force update of mItemCount
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int position = getFirstVisiblePosition();
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int y = getChildAt(0).getTop();
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setAdapter(getAdapter());
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setSelectionFromTop(position, y);
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// end hack
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}
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layoutChildren(); // force children to be recreated where needed
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v = getChildAt(i);
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if (v == null) {
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break;
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}
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}
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if (isDraggableRow(v)) {
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ViewGroup.LayoutParams params = v.getLayoutParams();
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params.height = mItemHeightNormal;
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v.setLayoutParams(params);
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v.setVisibility(View.VISIBLE);
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}
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}
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}
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/*
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* Adjust visibility and size to make it appear as though an item is being
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* dragged around and other items are making room for it: If dropping the
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* item would result in it still being in the same place, then make the
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* dragged listitem's size normal, but make the item invisible. Otherwise,
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* if the dragged list item is still on screen, make it as small as possible
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* and expand the item below the insert point. If the dragged item is not on
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* screen, only expand the item below the current insert point.
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*/
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private void doExpansion() {
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int childnum = mDragPos - getFirstVisiblePosition();
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if (mDragPos > mFirstDragPos) {
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childnum++;
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}
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View first = getChildAt(mFirstDragPos - getFirstVisiblePosition());
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for (int i = 0;; i++) {
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View vv = getChildAt(i);
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if (vv == null) {
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break;
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}
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int height = mItemHeightNormal;
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int visibility = View.VISIBLE;
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if (vv.equals(first)) {
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// processing the item that is being dragged
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if (mDragPos == mFirstDragPos) {
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// hovering over the original location
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visibility = View.INVISIBLE;
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} else {
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// not hovering over it
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height = 1;
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}
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} else if (i == childnum) {
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if (mDragPos < getCount() - 1) {
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height = mItemHeightExpanded;
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}
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}
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if (isDraggableRow(vv)) {
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ViewGroup.LayoutParams params = vv.getLayoutParams();
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params.height = height;
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vv.setLayoutParams(params);
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vv.setVisibility(visibility);
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}
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}
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// Request re-layout since we changed the items layout
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// and not doing this would cause bogus hitbox calculation
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// in myPointToPosition
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layoutChildren();
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}
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@Override
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public boolean onTouchEvent(MotionEvent ev) {
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if (mGestureDetector != null)
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mGestureDetector.onTouchEvent(ev);
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mTouchCurrentX = ev.getX();
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mTouchCurrentY = ev.getY();
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int action = ev.getAction();
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switch (action) {
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case MotionEvent.ACTION_UP:
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case MotionEvent.ACTION_CANCEL:
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if(mDragging)
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stopDragging();
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else if (dragThread != null && mClickListener != null)
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mClickListener.onClick(viewAtPosition());
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if(dragThread != null) {
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dragThread.interrupt();
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dragThread = null;
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}
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break;
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case MotionEvent.ACTION_DOWN:
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dragThread = new Thread(new DragRunnable(ev));
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dragThread.start();
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mTouchStartX = ev.getX();
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mTouchStartY = ev.getY();
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case MotionEvent.ACTION_MOVE:
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if(mDragging)
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dragView(ev);
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// detect scrolling
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if(dragThread != null && (Math.abs(mTouchCurrentX - mTouchStartX) > MOVEMENT_THRESHOLD ||
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Math.abs(mTouchCurrentY - mTouchStartY) > MOVEMENT_THRESHOLD)) {
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dragThread.interrupt();
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dragThread = null;
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}
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break;
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}
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if(mDragging)
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return true;
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return super.onTouchEvent(ev);
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}
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private View viewAtPosition() {
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int itemNum = pointToPosition((int) mTouchCurrentX, (int) mTouchCurrentY);
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if (itemNum == AdapterView.INVALID_POSITION)
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return null;
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return (View) getChildAt(itemNum - getFirstVisiblePosition());
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}
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// --- drag logic
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private class DragRunnable implements Runnable {
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private final MotionEvent ev;
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public DragRunnable(MotionEvent ev) {
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this.ev = ev;
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}
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public void run() {
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try {
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System.err.println("<<< commence fire");
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Thread.sleep(300L);
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System.err.println("<<< initiate drag!");
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post(new Runnable() {
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@Override
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public void run() {
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initiateDrag(ev);
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}
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});
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Thread.sleep(1000L);
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System.err.println("<<< me love you long time!");
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post(new Runnable() {
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public void run() {
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stopDragging();
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mClickListener.onLongClick(viewAtPosition());
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}
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});
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} catch (InterruptedException e) {
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// bye!
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System.err.println("<<< drag interrupted");
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}
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}
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};
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/**
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* @return true if drag was initiated
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*/
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protected boolean initiateDrag(MotionEvent ev) {
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int x = (int) mTouchStartX;
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int y = (int) mTouchStartY;
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int itemNum = pointToPosition(x, y);
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if (itemNum == AdapterView.INVALID_POSITION)
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return false;
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View item = (View) getChildAt(itemNum - getFirstVisiblePosition());
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if(!isDraggableRow(item))
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return false;
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stopDragging();
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System.err.println("GOT VIEW ITEM " + itemNum + " // " + item);
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mDragPoint = y - item.getTop();
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mCoordOffset = ((int) ev.getRawY()) - y;
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item.setDrawingCacheEnabled(true);
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// Create a copy of the drawing cache so that it does not get
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// recycled by the framework when the list tries to clean up memory
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Bitmap bitmap = Bitmap.createBitmap(item.getDrawingCache());
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item.setDrawingCacheEnabled(false);
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Rect listBounds = new Rect();
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getGlobalVisibleRect(listBounds, null);
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startDragging(bitmap, listBounds.left, y);
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mDragPos = itemNum;
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mFirstDragPos = mDragPos;
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mHeight = getHeight();
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int touchSlop = mTouchSlop;
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mUpperBound = Math.min(y - touchSlop, mHeight / 3);
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mLowerBound = Math.max(y + touchSlop, mHeight * 2 / 3);
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Vibrator v = (Vibrator) getContext().getSystemService(Context.VIBRATOR_SERVICE);
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v.vibrate(100);
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return true;
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}
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private void startDragging(Bitmap bm, int x, int y) {
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mWindowParams = new WindowManager.LayoutParams();
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mWindowParams.gravity = Gravity.TOP | Gravity.LEFT;
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mWindowParams.x = x;
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mWindowParams.y = y - mDragPoint + mCoordOffset;
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mWindowParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
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mWindowParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
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mWindowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
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| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
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| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
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| WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
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mWindowParams.format = PixelFormat.TRANSLUCENT;
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mWindowParams.windowAnimations = 0;
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ImageView v = new ImageView(getContext());
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v.setBackgroundColor(dragndropBackgroundColor);
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v.setImageBitmap(bm);
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mDragBitmap = bm;
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mWindowManager = (WindowManager) getContext().getSystemService(
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Context.WINDOW_SERVICE);
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mWindowManager.addView(v, mWindowParams);
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mDragView = v;
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mDragging = true;
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}
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private void dragView(MotionEvent ev) {
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int x = (int) ev.getX();
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int y = (int) ev.getY();
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float alpha = 1.0f;
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int width = mDragView.getWidth();
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if (mRemoveMode == SLIDE_RIGHT) {
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if (x > width / 2) {
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alpha = ((float) (width - x)) / (width / 2);
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}
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mWindowParams.alpha = alpha;
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} else if (mRemoveMode == SLIDE_LEFT) {
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if (x < width / 2) {
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alpha = ((float) x) / (width / 2);
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}
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mWindowParams.alpha = alpha;
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}
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mWindowParams.y = y - mDragPoint + mCoordOffset;
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mWindowManager.updateViewLayout(mDragView, mWindowParams);
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int itemnum = getItemForPosition(y);
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if (itemnum >= 0) {
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if (ev.getAction() == MotionEvent.ACTION_DOWN
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|| itemnum != mDragPos) {
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if (mDragListener != null) {
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mDragListener.drag(mDragPos, itemnum);
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}
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mDragPos = itemnum;
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doExpansion();
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}
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int speed = 0;
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adjustScrollBounds(y);
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if (y > mLowerBound) {
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// scroll the list up a bit
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speed = y > (mHeight + mLowerBound) / 2 ? 16 : 4;
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} else if (y < mUpperBound) {
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// scroll the list down a bit
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speed = y < mUpperBound / 2 ? -16 : -4;
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}
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if (speed != 0) {
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int ref = pointToPosition(0, mHeight / 2);
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if (ref == AdapterView.INVALID_POSITION) {
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// we hit a divider or an invisible view, check
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// somewhere else
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ref = pointToPosition(0, mHeight / 2
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+ getDividerHeight() + 64);
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}
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View v = getChildAt(ref - getFirstVisiblePosition());
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if (v != null) {
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int pos = v.getTop();
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setSelectionFromTop(ref, pos - speed);
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}
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}
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}
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}
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private void stopDragging() {
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if (mDragBitmap != null) {
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mDragBitmap.recycle();
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mDragBitmap = null;
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}
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unExpandViews(false);
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if (mDragView != null) {
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WindowManager wm = (WindowManager) getContext().getSystemService(
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Context.WINDOW_SERVICE);
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wm.removeView(mDragView);
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mDragView.setImageDrawable(null);
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mDragView = null;
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}
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if(mDragging) {
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if (mSwipeListener != null && mDragPos == mFirstDragPos) {
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if (mTouchCurrentX > mTouchStartX + SWIPE_THRESHOLD)
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mSwipeListener.swipeRight(mFirstDragPos);
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else if (mTouchStartX < mTouchStartX - SWIPE_THRESHOLD)
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mSwipeListener.swipeLeft(mFirstDragPos);
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} else if(mDropListener != null && mDragPos != mFirstDragPos &&
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mDragPos >= 0 && mDragPos < getCount()) {
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mDropListener.drop(mFirstDragPos, mDragPos);
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}
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}
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mDragging = false;
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}
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// --- getters and setters
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public void setDragListener(DragListener l) {
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mDragListener = l;
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||||
}
|
||||
|
||||
public void setDropListener(DropListener l) {
|
||||
mDropListener = l;
|
||||
}
|
||||
|
||||
public void setSwipeListener(SwipeListener l) {
|
||||
mSwipeListener = l;
|
||||
}
|
||||
|
||||
public void setClickListener(GrabberClickListener listener) {
|
||||
this.mClickListener = listener;
|
||||
}
|
||||
|
||||
public void setDragndropBackgroundColor(int color) {
|
||||
this.dragndropBackgroundColor = color;
|
||||
}
|
||||
|
||||
@SuppressWarnings("nls")
|
||||
@Override
|
||||
final public void addHeaderView(View v, Object data, boolean isSelectable) {
|
||||
throw new RuntimeException(
|
||||
"Headers are not supported with TouchListView");
|
||||
}
|
||||
|
||||
@SuppressWarnings("nls")
|
||||
@Override
|
||||
final public void addHeaderView(View v) {
|
||||
throw new RuntimeException(
|
||||
"Headers are not supported with TouchListView");
|
||||
}
|
||||
|
||||
@SuppressWarnings("nls")
|
||||
@Override
|
||||
final public void addFooterView(View v, Object data, boolean isSelectable) {
|
||||
if (mRemoveMode == SLIDE_LEFT || mRemoveMode == SLIDE_RIGHT) {
|
||||
throw new RuntimeException(
|
||||
"Footers are not supported with TouchListView in conjunction with remove_mode");
|
||||
}
|
||||
}
|
||||
|
||||
@SuppressWarnings("nls")
|
||||
@Override
|
||||
final public void addFooterView(View v) {
|
||||
if (mRemoveMode == SLIDE_LEFT || mRemoveMode == SLIDE_RIGHT) {
|
||||
throw new RuntimeException(
|
||||
"Footers are not supported with TouchListView in conjunction with remove_mode");
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue