Add support for custom ViewPager.PageTransformer.

README.md

@@ -162,7 +162,9 @@ setVariantEmoji(yourClassThatImplementsVariantEmoji)
 
 If no instance or a null instance is set the [default implementation](./emoji/src/main/java/com/vanniktech/emoji/VariantEmojiManager.java) will be used.
 
-### Custom enter and exit animations
+## Animations
+
+### Custom keyboard enter and exit animations
 
 You can pass your own animation style for enter and exit transitions of the Emoji keyboard while you're building the [`EmojiPopup`](emoji/src/main/java/com/vanniktech/emoji/EmojiPopup.java):
 
@@ -176,6 +178,16 @@ This library currently ships with two animation styles as an example:
 - R.style.emoji_slide_animation_style
 - R.style.emoji_fade_animation_style
 
+### Custom page transformers
+
+You can pass your own Page Transformer for the Emoji keyboard View Pager while you're building the [`EmojiPopup`](emoji/src/main/java/com/vanniktech/emoji/EmojiPopup.java):
+
+```java
+setPageTransformer(new MagicTransformer());
+```
+
+If no transformer is set ViewPager will behave as its usual self. Please do note that this library currently does not ship any example Page Transformers.
+
 # Snapshots
 
 This library is also distributed as a SNAPSHOT if you like to check out the latest features.

app/build.gradle

@@ -63,6 +63,8 @@ dependencies {
   implementation rootProject.ext.supportRecyclerView
   implementation rootProject.ext.supportEmojiBundled
 
+  implementation 'com.eftimoff:android-viewpager-transformers:1.0.1@aar'
+
   debugImplementation rootProject.ext.leakCanaryDebug
   releaseImplementation rootProject.ext.leakCanaryRelease
 

app/src/main/java/com/vanniktech/emoji/sample/MainActivity.java

@@ -13,6 +13,7 @@
 import android.view.MenuItem;
 import android.view.ViewGroup;
 import android.widget.ImageView;
+import com.eftimoff.viewpagertransformers.RotateUpTransformer;
 import com.vanniktech.emoji.EmojiEditText;
 import com.vanniktech.emoji.EmojiManager;
 import com.vanniktech.emoji.EmojiPopup;
@@ -137,6 +138,7 @@ private void setUpEmojiPopup() {
         .setOnEmojiPopupDismissListener(() -> emojiButton.setImageResource(R.drawable.emoji_ios_category_smileysandpeople))
         .setOnSoftKeyboardCloseListener(() -> Log.d(TAG, "Closed soft keyboard"))
         .setKeyboardAnimationStyle(R.style.emoji_slide_animation_style)
+        .setPageTransformer(new RotateUpTransformer())
         .build(editText);
   }
 }

emoji/src/main/java/com/vanniktech/emoji/EmojiPopup.java

@@ -11,13 +11,13 @@
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.annotation.StyleRes;
+import android.support.v4.view.ViewPager;
 import android.view.Gravity;
 import android.view.View;
 import android.view.ViewTreeObserver;
 import android.view.inputmethod.InputMethodManager;
 import android.widget.EditText;
 import android.widget.PopupWindow;
-
 import com.vanniktech.emoji.emoji.Emoji;
 import com.vanniktech.emoji.listeners.OnEmojiBackspaceClickListener;
 import com.vanniktech.emoji.listeners.OnEmojiClickListener;
@@ -110,7 +110,7 @@ public final class EmojiPopup {
   EmojiPopup(@NonNull final View rootView, @NonNull final EditText editText,
       @Nullable final RecentEmoji recent, @Nullable final VariantEmoji variant,
       @ColorInt final int backgroundColor, @ColorInt final int iconColor, @ColorInt final int dividerColor,
-      @StyleRes final int animationStyle) {
+      @StyleRes final int animationStyle, @Nullable final ViewPager.PageTransformer pageTransformer) {
     this.context = Utils.asActivity(rootView.getContext());
     this.rootView = rootView.getRootView();
     this.editText = editText;
@@ -143,7 +143,7 @@ public final class EmojiPopup {
 
     variantPopup = new EmojiVariantPopup(this.rootView, clickListener);
 
-    final EmojiView emojiView = new EmojiView(context, clickListener, longClickListener, recentEmoji, variantEmoji, backgroundColor, iconColor, dividerColor);
+    final EmojiView emojiView = new EmojiView(context, clickListener, longClickListener, recentEmoji, variantEmoji, backgroundColor, iconColor, dividerColor, pageTransformer);
     emojiView.setOnEmojiBackspaceClickListener(new OnEmojiBackspaceClickListener() {
       @Override public void onEmojiBackspaceClick(final View v) {
         backspace(editText);
@@ -236,10 +236,11 @@ private void showAtBottomPending() {
 
   public static final class Builder {
     @NonNull private final View rootView;
-    @StyleRes private int animationStyle;
+    @StyleRes private int keyboardAnimationStyle;
     @ColorInt private int backgroundColor;
     @ColorInt private int iconColor;
     @ColorInt private int dividerColor;
+    @Nullable private ViewPager.PageTransformer pageTransformer;
     @Nullable private OnEmojiPopupShownListener onEmojiPopupShownListener;
     @Nullable private OnSoftKeyboardCloseListener onSoftKeyboardCloseListener;
     @Nullable private OnSoftKeyboardOpenListener onSoftKeyboardOpenListener;
@@ -330,15 +331,21 @@ private Builder(final View rootView) {
     }
 
     @CheckResult public Builder setKeyboardAnimationStyle(@StyleRes final int animation) {
-      animationStyle = animation;
+      keyboardAnimationStyle = animation;
+      return this;
+    }
+
+    @CheckResult public Builder setPageTransformer(@Nullable final ViewPager.PageTransformer transformer) {
+      pageTransformer = transformer;
       return this;
     }
 
     @CheckResult public EmojiPopup build(@NonNull final EditText editText) {
       EmojiManager.getInstance().verifyInstalled();
       checkNotNull(editText, "EditText can't be null");
 
-      final EmojiPopup emojiPopup = new EmojiPopup(rootView, editText, recentEmoji, variantEmoji, backgroundColor, iconColor, dividerColor, animationStyle);
+      final EmojiPopup emojiPopup = new EmojiPopup(rootView, editText, recentEmoji, variantEmoji, backgroundColor,
+          iconColor, dividerColor, keyboardAnimationStyle, pageTransformer);
       emojiPopup.onSoftKeyboardCloseListener = onSoftKeyboardCloseListener;
       emojiPopup.onEmojiClickListener = onEmojiClickListener;
       emojiPopup.onSoftKeyboardOpenListener = onSoftKeyboardOpenListener;

emoji/src/main/java/com/vanniktech/emoji/EmojiView.java

@@ -38,10 +38,12 @@
 
   private int emojiTabLastSelectedIndex = -1;
 
-  @SuppressWarnings("PMD.CyclomaticComplexity") public EmojiView(final Context context, final OnEmojiClickListener onEmojiClickListener,
-        final OnEmojiLongClickListener onEmojiLongClickListener, @NonNull final RecentEmoji recentEmoji,
-        @NonNull final VariantEmoji variantManager, @ColorInt final int backgroundColor,
-        @ColorInt final int iconColor, @ColorInt final int dividerColor) {
+  @SuppressWarnings("PMD.CyclomaticComplexity") public EmojiView(final Context context,
+      final OnEmojiClickListener onEmojiClickListener,
+      final OnEmojiLongClickListener onEmojiLongClickListener, @NonNull final RecentEmoji recentEmoji,
+      @NonNull final VariantEmoji variantManager, @ColorInt final int backgroundColor,
+      @ColorInt final int iconColor, @ColorInt final int dividerColor,
+      @Nullable final ViewPager.PageTransformer pageTransformer) {
     super(context);
 
     View.inflate(context, R.layout.emoji_view, this);
@@ -58,6 +60,10 @@
     final View emojiDivider = findViewById(R.id.emojiViewDivider);
     emojiDivider.setBackgroundColor(dividerColor != 0 ? dividerColor : Utils.resolveColor(context, R.attr.emojiDivider, R.color.emoji_divider));
 
+    if (pageTransformer != null) {
+      emojisPager.setPageTransformer(true, pageTransformer);
+    }
+
     final LinearLayout emojisTab = findViewById(R.id.emojiViewTab);
     emojisPager.addOnPageChangeListener(this);