Regularly, I am pleasantly surprised by websites using a pattern I called the discrollver pattern. I'm sure you already know what I'm talking about but if not, http://vimeo.com/player is a good example. When you scroll, widgets appear from nowhere by fade, translation or scale.
With DiscrollView, I wanted to import this pattern on Android. This is an 0.0.1 alpha version because you have to do all the transformation work (fade, translation, scale etc) yourself base on a ratio value. I'm going to add some transformation presets (translation from left to right + fade in for example) to make the library more ready to use for lazy developers.
Try out the sample APK here
Or browse the source code of the sample application for a complete example of use.
Just add the library to your application as a library project.
API 14+
Using the library is simple, just look at the source code of the provided sample here
compile 'com.github.flavienlaurent.discrollview:library:0.0.2@aar' You must use the DiscrollViewContent view.
<com.flavienlaurent.discrollview.lib.DiscrollView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:discrollve="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <com.flavienlaurent.discrollview.lib.DiscrollViewContent android:layout_width="match_parent" android:layout_height="match_parent"> <!-- here you put discrollvable views --> </com.flavienlaurent.discrollview.lib.DiscrollViewContent> </com.flavienlaurent.discrollview.lib.DiscrollView>You can apply some transformation on discroll:
- alpha
- scale
- translation (fromLeft, fromBottom, fromRight, fromTop) fromLeft+fromRight and fromBottom+fromTop are forbidden couples.
- bgcolor
discrollve:discrollve_alpha="true" discrollve:discrollve_translation="fromLeft|fromBottom" discrollve:discrollve_scaleX="true" discrollve:discrollve_scaleY="true" discrollve:discrollve_fromBgColor="#88EE66" discrollve:discrollve_toBgColor="#000000" discrollve:discrollve_threshold="0.3"The threshold attribute is used to trigger the discrollve at a specified ratio. For example, if threshold=0.3, the discrollve starts when the ratio >= 0.3.
<com.flavienlaurent.discrollview.lib.DiscrollView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:discrollve="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <com.flavienlaurent.discrollview.lib.DiscrollViewContent android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:layout_width="match_parent" android:layout_height="600dp" android:background="@android:color/white" android:textColor="@android:color/black" android:padding="25dp" android:textSize="72sp" android:gravity="center" android:fontFamily="serif" android:text="Do you love cheese?" /> <View android:layout_width="match_parent" android:layout_height="200dp" android:background="#007788" discrollve:discrollve_alpha="true" discrollve:discrollve_threshold="0.3" /> <ImageView android:layout_width="200dp" android:layout_height="120dp" discrollve:discrollve_alpha="true" discrollve:discrollve_translation="fromLeft|fromBottom" android:src="@drawable/cheese1" /> <View android:layout_width="match_parent" android:layout_height="200dp" discrollve:discrollve_fromColor="#88EE66" discrollve:discrollve_toColor="#000000" /> <ImageView android:layout_width="220dp" android:layout_height="110dp" android:layout_gravity="right" android:src="@drawable/cheese2" discrollve:discrollve_translation="fromRight" /> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="20dp" android:fontFamily="serif" android:gravity="center" android:text="When the cheese comes out everybody's happy pecorino red leicester" android:textSize="18sp" discrollve:discrollve_alpha="true" discrollve:discrollve_translation="fromBottom" /> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="20dp" android:layout_gravity="center" android:src="@drawable/ilovecheese_heart" discrollve:discrollve_scaleX="true" discrollve:discrollve_scaleY="true" /> </com.flavienlaurent.discrollview.lib.DiscrollViewContent> </com.flavienlaurent.discrollview.lib.DiscrollView>Copyright 2013 Flavien Laurent 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.