drag-sort-listview

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drag-sort-listview

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Android ListView with drag and drop reordering.

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DragSortListView
================

# NOTICE: No longer maintained.

I do not have much time to devote to this project so I am
dropping support for the time being. Sorry everybody!

News
----

**April 2, 2013**: Hey all. If you want to send a pull request,
please read the [Contributing](https://github.com/bauerca/drag-sort-listview#contributing) section first. Thanks!

**Feb. 9, 2013**: Version 0.6.0. Consolidated remove modes to
`click_remove` and `fling_remove`. No more fling remove while
dragging; fling anywhere on item to remove it.
[Leszek Mzyk](https://github.com/imbryk) is a bona fide code-slanger.

**Jan. 10, 2013**: Version 0.5.0 is released. Supports ListView
multi-choice and single-choice modes thanks to the hard work of
[Mattias Flodin](https://github.com/mattiasflodin)! Awesome-sauce.
Check out the new demos.

**Nov. 23, 2012**: Hmmm, what's this? &rarr; [Gittip](https://www.gittip.com/bauerca) :)

**Nov. 17, 2012**: [Drag-Sort Demos](https://play.google.com/store/apps/details?id=com.mobeta.android.demodslv)
app in Google Play Store!

**Nov. 15, 2012**: Smooth operation! Drops and removals are animated.
Also, DragSortController now provides a convenience
click-to-remove feature (see [XML attrs](https://github.com/bauerca/drag-sort-listview#xml-layout-declaration)
and [RemoveListener](https://github.com/bauerca/drag-sort-listview#dragsortlistviewremovelistener)
sections).

**Nov. 11, 2012**: Mavenized.
Thanks to [Andreas Schildbach (Goonie)](https://github.com/Goonie)!

**Oct. 30, 2012**: DragSortCursorAdapter class helps you reorder
a Cursor-backed ListAdapter. Look at ResourceDragSortCursorAdapter
and SimpleDragSortCursorAdapter as well in [the API](
http://bauerca.github.com/drag-sort-listview).

**Oct. 19, 2012**: Public API documentation is up at
http://bauerca.github.com/drag-sort-listview.

**Oct. 19, 2012**: Refactoring rampage. Backward compatibility is slightly
broken. New features make it worthwhile :) and include: total floating
View customization, total control over drag start/stop,
and a helper class implementing common patterns (long-press to drag,
fling-to-remove, etc.). Thanks to
[Dan Hulme (orac)](https://github.com/orac)
for getting all this rolling!
Check out the extensively updated demos and usage section below.

**Sept. 26, 2012**: Drag-sorting is now animated! (optional, of course)
Items slide around underneath the floating (dragged) View.

Overview
--------

DragSortListView (DSLV) is an extension of the Android ListView that enables
drag-and-drop reordering of list items. It is a ~~major overhaul~~ complete
rewrite of
the [TouchInterceptor](https://github.com/android/platform_packages_apps_music/blob/master/src/com/android/music/TouchInterceptor.java) (TI) 
meant to give drag-sorting a polished feel. Some key features are:

1. Clean drag and drop (no visual glitches; I hope!)
2. Intuitive and smooth scrolling while dragging.
3. Support for heterogeneous item heights.
4. Public `startDrag()` and `stopDrag()` methods.
5. Public interface for customizing the floating View.

DragSortListView is useful for all kinds of prioritized lists:
favorites, playlists, checklists, etc. Would love to hear about
your use case or app by email.
I hope you find it useful; and please, help me improve the thing!

Widget usage
------------

Three major elements define the drag-sort process. Roughly, in
order of importance, they are:

1. **Data reordering**. Drag-sorts reorder the data
underlying your list. Since DSLV
cannot know how you organize your data, the reordering must be
performed by you using the provided Listener interfaces.
2. **Drag start/stop**. Drags are started and stopped by
calling `startDrag()` and
`stopDrag()` on your DSLV instance; but some help that is.
The convenience class, DragSortController, provides all kinds of
boiler-plate for common start/stop/remove drag patterns.
3. **Floating View**. The floating View appearance and behavior is
controlled by an
implementation of the FloatViewManager interface. With this, you
can display any View you like as the floating View, and update its
appearance/location on every touch event. The DragSortController
helper class also implements this interface for convenience.

Number 1 is essential. As mentioned above, 2 and 3 can
be handled by the DragSortController helper class. Keep reading,
then head to the
demo and start studying some examples.

### XML layout declaration

DragSortListView can be declared in an XML layout file just like
the ListView. Several example layout files are
[provided in the demo](https://github.com/bauerca/drag-sort-listview/blob/master/demo/res/layout/).
The available attributes (in addition to the usual
ListView attributes) are given below. Read each bullet as

* `<xml attr>`: (`<datatype>`, `<default value>`) `<description>`.

#### XML attributes

* `collapsed_height`: (dimension, 1px) Height of placeholder at original
drag position. Cannot be zero.
* `drag_scroll_start`: (float, 0.3) Start of drag-scroll regions
(defined by a
fraction of the total DSLV height; i.e. between 0 and 1).
* `max_drag_scroll_speed`: (float, 0.5) Maximum drag-scroll speed for
default linear drag-scroll profile. Units of pixels/millisecond.
* `float_alpha`: (float, 1.0) Transparency of floating View. Value from
0 to 1 where 1 is opaque.
* `slide_shuffle_speed`: (float, 0.7) Speed of shuffle animations
underneath floating View. A value
of 0 means a shuffle animation is always in progress, whereas a value
of 1 means items snap from position to position without animation.
* `drop_animation_duration`: (int, 150) Drop animation smoothly centers
  the floating View over the drop slot before destroying it. Duration
  in milliseconds.
* `remove_animation_duration`: (int, 150) Remove animation smoothly
  collapses the empty slot when an item is removed. Duration
  in milliseconds.
* `track_drag_sort`: (bool, false) Debugging option; explained below.
* `use_default_controller`: (bool, true) Have DSLV create a
  DragSortController instance and pass the following xml attributes
  to it. If you set this to false, ignore the following attributes.
* `float_background_color`: (color, BLACK) Set the background
  color of the floating View when using the default
  DragSortController. Floating View in this case is a snapshot of
  the list item to be dragged.
* `drag_handle_id`: (id, 0) Android resource id that points to a
  child View of a list item (or the root View of the list item
  layout). This identifies the "drag handle," or the View within a
  list item that must
  be touched to start a drag-sort of that item.
  Required if drags are to be enabled using the default
  DragSortController.
* `sort_enabled`: (bool, true) Enable sorting of dragged item (disabling
  is useful when you only want item removal).
* `drag_start_mode`: (enum, "onDown") Sets the gesture for starting
  a drag.
    + "onDown": Drag starts when finger touches down
      on the drag handle.
    + "onDrag": Drag starts when finger touches down on drag handle
      and then drags (allows item clicks and long clicks).
    + "onLongPress": Drag starts on drag handle long press (allows
      item clicks).
* `remove_enabled`: (bool, false) Enable dragged item removal by one
  of the `remove_mode` options below.
* `remove_mode`: (enum, "flingRight") Sets the gesture for removing the
  dragged item.
    + "clickRemove": Click on item child View with id `click_remove_id`.
    + "flingRemove": Fling horizontal anywhere on item.
* `click_remove_id`: (id, 0) Android resource id that points to a
  child View of a list item. When `remove_mode="clickRemove"` and
  `remove_enabled="true"`, a click on this child View removes the
  containing item. This attr is used by DragSortController.
* `fling_handle_id`: (id, 0) Android resource id that points to a
  child View of a list item. When `remove_mode="flingRemove"` and
  `remove_enabled="true"`, a fling that originates on this child
  View removes the containing item. This attr is used by
  DragSortController.

### Listeners

DragSortListView is a ListView, and thus requires a [ListAdapter](http://developer.android.com/reference/android/widget/ListAdapter.html)
to populate
its items. Drag-sorting additionally implies a reordering of the items
in the ListAdapter, achieved through callbacks to special Listener
interfaces
defined in DSLV. Listeners can be registered with DSLV in two ways:

1. Pass them individually to the `set*Listener()` methods
2. Implement the Listener interfaces you require in a custom
ListAdapter; when `DragSortListView.setAdapter()` is called
with your custom
Adapter, DSLV detects which interfaces are implemented and calls
the appropriate `set*Listener()` methods on itself with the
provided ListAdapter as argument.

Each Listener interface is described below:

#### DragSortListView.DropListener

The DropListener interface has a single callback:
```java
public void drop(int from, int to);
```
This is called upon completion of the drag-sort; i.e. when the
floating View is dropped.
The parameter `from` is the ListView item that was originally dragged,
and `to` is the position where the item was dropped.
This is an important callback; without
a DropListener, DSLV is for all practical purposes useless.

For proper DSLV operation, this callback must perform
a reordering of the data in your ListAdapter. For example, one often
has a Cursor that pulls from a database and backs a
CursorAdapter. The order of items in the
Cursor is fixed; therefore, given drag-sorting, you must implement
a mapping from Cursor positions to DSLV positions. This is commonly
done
within in a custom ListAdapter or CursorWrapper that implements the
DropListener interface. See Issue #20 for a discussion of this.
**Update**: Or simply use the DragSortCursorAdapter class!

If your DSLV instance `android:choiceMode` is not `"none"`, and your
ListAdapter does not have stable ids, you must call
[DragSortListView.moveCheckState(int from, int to)](http://bauerca.github.com/drag-sort-listview/reference/com/mobeta/android/dslv/DragSortListView.html#moveCheckState(int, int\))
within `drop(from, to)`. See the documentation in the DSLV API for more
info.

#### DragSortListView.RemoveListener

As the TI did, DSLV provides gestures for removing the floating
View (and its associated list item) from the list. Upon completion of
a remove gesture, DSLV calls the RemoveListener method:
```java
public void remove(int which);
```
The position `which` should be "removed" from your ListAdapter; i.e.
the mapping from your data (e.g. in a Cursor) to your ListAdapter
should henceforth neglect the item previously pointed to by `which`.
Whether you actually remove the data or not is up to you.

Item removal can now happen outside of a drag event. The method
`DragSortListView.removeItem(int position)` can be called at any time.

If your DSLV instance `android:choiceMode` is not `"none"`, and your
ListAdapter does not have stable ids, you must call
[DragSortListView.removeCheckState(int position)](http://bauerca.github.com/drag-sort-listview/reference/com/mobeta/android/dslv/DragSortListView.html#removeCheckState(int\))
within `remove(which)`. See the documentation in the DSLV API for more
info.

#### DragSortListView.DragListener

The callback in the DragListener is
```java
public void drag(int from, int to);
```
This is called whenever the floating View hovers to a new potential
drop position; `to` is the current potential drop position, and `from` is
the previous one. The TI provided this callback; an example of usage
does not come to mind.

#### DragSortListView.DragSortListener

This is a convenience interface which combines all of the above
Listener interfaces.

### FloatViewManager

This is the interface that handles creation, updates, and tear-downs
of the floating View. It is passed to DSLV using the
`setFloatViewManager()` method. Example usage can be found in
the SimpleFloatViewManager, which
is a convenience class
that simply takes a snapshot of the list item to be dragged.

If you want to spice up the floating View, implement your own
FloatViewManager. In your
`onCreateFloatView()` method, you should make sure that the View
you return has a definite height (do not use MATCH_PARENT! although
MATCH_PARENT is perfectly okay for the layout width).
DSLV will measure and layout your floating View according to
the ViewGroup.LayoutParams attached to it. If no LayoutParams are
attached, DSLV will use WRAP_CONTENT and MATCH_PARENT as the layout
height and width.

### Drag start/stop

As of DragSortListView 0.3.0, drag start and stop behavior is all up
to you. Feel free to call `startDrag()` or `stopDrag()` on the
DSLV instance whenever you please. Be aware that if no
touch event is in progress when `startDrag()` is called, the drag will
not start. But don't waste too much time working on your own drag
initiation if it's simple; the DragSortController described below
will do that for you.

### DragSortController

The DragSortController
is a convenience class that implements some common
design patterns for initiating drags or removing the dragged item
from the list. It implements
the View.OnTouchListener interface to watch touch events as they are
dispatched to DSLV. It also implements the FloatViewManager interface
(by subclassing SimpleFloatViewManager) to handle simple floating View
creation. If you do not use XML to create
the default DragSortController, you must pass in your own
instance of DragSortController
to both the `setFloatViewManager()` *and* `setOnTouchListener()`
methods of the DSLV instance.

The default behavior of the DragSortController expects list items
that are drag enabled to have a child View called a "drag handle."
The drag handle View should have an associated android resource id,
and that id should
be passed into the DragSortController (the id can be set in XML if
`use_default_controller` is `true`). If a touch event lands on the
drag handle of an item, and a gesture is detected that should start a
drag, the drag starts.

Additional documentation
------------------------

There is limited documentation in the DSLV.
You can check it
out with Javadoc by navigating to `/path/to/drag-sort-listview/src/` and
typing

javadoc com.mobeta.android.dslv *

The javadoc can be viewed on the DSLV project page:
http://bauerca.github.com/drag-sort-listview. Sorry for the many
broken links at the moment. I am slowly getting to this.

Installation
------------

Download and install the [Android sdk](http://developer.android.com/sdk/index.html). Clone/Download/Fork the repo
through GitHub or via (read-only)

git clone https://github.com/bauerca/drag-sort-listview.git

### Ant

Execute the following in both the drag-sort-listview/library/ and
drag-sort-listview/demo/ directories (assuming
/path/to/android_sdk/tools is in your PATH):

android update project --path ./

To test out the demo, navigate to drag-sort-listview/demo/ and
execute

ant debug install

to build and install the demo on your connected device/emulator.

### Maven

A simple

mvn clean install

should suffice to build and put the DSLV lib and demo in your local
maven repository. To include in your project, add the following
dependency to your pom.xml:

```xml
<dependency>
    <groupId>com.mobeta.android.dslv</groupId>
    <artifactId>drag-sort-listview</artifactId>
    <version>0.6.1-SNAPSHOT</version>
    <type>apklib</type>
</dependency>
```

### Installation in Eclipse (Indigo)

The first step is to choose File > Import or right-click in the Project Explorer
and choose Import. If you don't use E-Git to integrate Eclipse with Git, skip
the rest of this paragraph. Choose "Projects from Git" as the import source.
From the Git page, click Clone, and enter the URI of this repository. That's the
only text box to fill in on that page. On the following pages, choose which
branches to clone (probably all of them) and where to keep the local checkout,
and then click Finish. Once the clone has finished, pick your new repository
from the list, and on the following page select 'Use the New Projects wizard'.

From here the process is the same even if you don't use E-Git. Choose 'Android
Project from Existing Code' and then browse to where you checked out DSLV. You
should then see two projects in the list: one named after the directory name,
and the other called com.mobeta.android.demodslv.Launcher . The top one is the
library project, and the bottom one the demo project. You probably want both at
first, so just click Finish.

Finally, to add the library to your application project, right-click your
project in the Package Explorer and select Properties. Pick the "Android" page,
and click "Add..." from the bottom half. You should see a list including the
DSLV project as well as any others in your workspace.

Contributing
------------

First of all, thank you! Many of your pull requests have added
tremendous value to this project. Your efforts are truly appreciated!

Now that the project is fairly mature, I would like to lay out
some (loose) rules for future pull requests. So far I have
only one (of course, you should help me add more). Here's the list:

* Avoid pull requests that are small tweaks to default
  DragSortController behavior. This class is merely a guide/helper
  for creating more complex drag-sort interactions. For example,
  if you don't
  like the feel of the default fling-remove initiation for your
  app, then you should not create a pull request that "fixes"
  the behavior. Rather, try to modify or subclass DragSortController
  for your particular needs. That said, if a "must-have" touch
  pattern arises, I think there is some wiggle room in this rule.

Debugging
---------

If you have python and [matplotlib](http://matplotlib.sourceforge.net/)
installed, you can use the script dslv.py
to debug drag-sort behavior. This script
is found in the project tools/ directory.

To enable, just set the `dslv:track_drag_sort` attribute to
`"true"` in XML. While drag-sorting on your emulator or device,
this tracking causes the DSLV to periodically dump its state to
a file called dslv_state.txt in the device/emulator /sdcard/ directory.

Navigate to the location of dslv.py, and do

adb [-e|-d|-s device] pull /sdcard/dslv_state.txt

then simply run

python dslv.py

An image should appear that represents the DSLV in the final
recorded state. Right and left keys allow stepping
through the recorded drag-sort frame-by-frame; up/down keys jump
30 frames. This tool has
been very useful for debugging jumpy behavior while drag-scrolling.

License
-------

```
A subclass of the Android ListView component that enables drag
and drop re-ordering of list items.

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.
```

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