Add Open/close/query

drawer-behavior/src/main/java/com/jakewharton/behavior/drawer/BehaviorDelegate.java

@@ -194,7 +194,7 @@ boolean onTouchEvent(MotionEvent ev) {
           final int slop = dragger.getTouchSlop();
           if (dx * dx + dy * dy < slop * slop) {
             // Taps close a dimmed open drawer but only if it isn't locked open.
-            if ((openState & FLAG_IS_OPENED) == FLAG_IS_OPENED) { // TODO isDrawerOpen method?
+            if (isDrawerOpen()) { // TODO isDrawerOpen method?
               peekingOnly = false;
             }
           }
@@ -276,7 +276,7 @@ private void updateDrawerState(int activeState, View activeDrawer) {
   }
 
   private void dispatchOnDrawerClosed(View drawerView) {
-    if ((openState & FLAG_IS_OPENED) == FLAG_IS_OPENED) {
+    if (isDrawerOpen()) {
       openState = 0;
 
       updateChildrenImportantForAccessibility(drawerView, false);
@@ -294,7 +294,7 @@ private void dispatchOnDrawerClosed(View drawerView) {
   }
 
   private void dispatchOnDrawerOpened(View drawerView) {
-    if ((openState & FLAG_IS_OPENED) == 0) {
+    if (!isDrawerOpen()) {
       openState = FLAG_IS_OPENED;
 
       updateChildrenImportantForAccessibility(drawerView, true);
@@ -325,8 +325,7 @@ private void updateChildrenImportantForAccessibility(View drawerView, boolean is
     }
   }
 
-  @Override
-  public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
+  @Override public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
     int childWidth = changedView.getWidth();
 
     // This reverses the positioning shown in onLayout.
@@ -393,6 +392,55 @@ private void setDrawerViewOffset(float slideOffset) {
     return child.getTop();
   }
 
+  public boolean isDrawerOpen() {
+    return (openState & FLAG_IS_OPENED) == FLAG_IS_OPENED;
+  }
+
+  public boolean isDrawerOpening(){
+    return (openState & FLAG_IS_OPENING) == FLAG_IS_OPENING;
+  }
+
+  public boolean isDrawerClosing(){
+    return (openState & FLAG_IS_CLOSING) == FLAG_IS_CLOSING;
+  }
+
+  public void openDrawer() {
+    if (isDrawerOpen() || isDrawerOpening()) {
+      return;
+    }
+
+    boolean needsSettle;
+
+    if (isLeft) {
+      needsSettle = dragger.smoothSlideViewTo(child, 0, child.getTop());
+    } else {
+      needsSettle =
+          dragger.smoothSlideViewTo(child, parent.getWidth() - child.getWidth(), child.getTop());
+    }
+
+    if (needsSettle) {
+      ViewCompat.postOnAnimation(parent, draggerSettle);
+    }
+  }
+
+  public void closeDrawer() {
+    if (!isDrawerOpen() || isDrawerClosing()) {
+      return;
+    }
+
+    boolean needsSettle;
+
+    if (isLeft) {
+      needsSettle = dragger.smoothSlideViewTo(child, -child.getWidth(), child.getTop());
+    } else {
+      needsSettle = dragger.smoothSlideViewTo(child, parent.getWidth(), child.getTop());
+    }
+
+    if (needsSettle) {
+      ViewCompat.postOnAnimation(parent, draggerSettle);
+    }
+  }
+
   boolean onLayoutChild() {
     int width = parent.getMeasuredWidth();
     int height = parent.getMeasuredHeight();

drawer-behavior/src/main/java/com/jakewharton/behavior/drawer/DrawerBehavior.java

@@ -19,12 +19,13 @@
 import android.content.res.TypedArray;
 import android.support.annotation.Keep;
 import android.support.design.widget.CoordinatorLayout;
-import android.support.v4.util.SimpleArrayMap;
+import android.support.v4.util.ArrayMap;
 import android.support.v4.view.GravityCompat;
 import android.util.AttributeSet;
 import android.view.Gravity;
 import android.view.MotionEvent;
 import android.view.View;
+import android.view.ViewGroup;
 
 public final class DrawerBehavior extends CoordinatorLayout.Behavior<View> {
   private static void validateGravity(int gravity) {
@@ -36,7 +37,7 @@ private static void validateGravity(int gravity) {
     }
   }
 
-  private final SimpleArrayMap<View, BehaviorDelegate> delegates = new SimpleArrayMap<>();
+  private final ArrayMap<View, BehaviorDelegate> delegates = new ArrayMap<>();
   private final int gravity;
 
   @SuppressWarnings("unused") // Public API for programmatic instantiation.
@@ -66,18 +67,40 @@ private BehaviorDelegate delegate(CoordinatorLayout parent, View child) {
     return delegate;
   }
 
-  @Override
-  public boolean onLayoutChild(CoordinatorLayout parent, View child, int layoutDirection) {
+  @Override public boolean onLayoutChild(CoordinatorLayout parent, View child, int layoutDirection) {
     return child.getVisibility() == View.GONE //
         || delegate(parent, child).onLayoutChild();
   }
 
-  @Override
-  public boolean onInterceptTouchEvent(CoordinatorLayout parent, View child, MotionEvent ev) {
+  @Override public boolean onInterceptTouchEvent(CoordinatorLayout parent, View child, MotionEvent ev) {
     return delegate(parent, child).onInterceptTouchEvent(ev);
   }
 
   @Override public boolean onTouchEvent(CoordinatorLayout parent, View child, MotionEvent ev) {
     return delegate(parent, child).onTouchEvent(ev);
   }
+
+  public void open(){
+    for(BehaviorDelegate delegate : delegates.values()){
+      delegate.openDrawer();
+    }
+  }
+
+  public void close(){
+    for(BehaviorDelegate delegate : delegates.values()){
+      delegate.closeDrawer();
+    }
+  }
+
+  public static DrawerBehavior from(View view) {
+    ViewGroup.LayoutParams params = view.getLayoutParams();
+    if (!(params instanceof CoordinatorLayout.LayoutParams)) {
+      throw new IllegalArgumentException("The view is not a child of CoordinatorLayout");
+    }
+    CoordinatorLayout.Behavior behavior = ((CoordinatorLayout.LayoutParams) params).getBehavior();
+    if (!(behavior instanceof DrawerBehavior)) {
+      throw new IllegalArgumentException("The view is not associated with DrawerBehavior");
+    }
+    return (DrawerBehavior) behavior;
+  }
 }

sample/src/main/java/com/example/behavior/drawer/DrawerBehaviorActivity.java

@@ -2,10 +2,30 @@
 
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
+import android.view.View;
+import com.jakewharton.behavior.drawer.DrawerBehavior;
 
 public final class DrawerBehaviorActivity extends AppCompatActivity {
+
+  private DrawerBehavior drawerBehavior;
+
   @Override protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.drawer_behavior);
+    drawerBehavior = DrawerBehavior.from(findViewById(R.id.drawerView));
+
+    //noinspection ConstantConditions
+    findViewById(R.id.openButton).setOnClickListener(new View.OnClickListener() {
+      @Override public void onClick(View v) {
+        drawerBehavior.open();
+      }
+    });
+
+    //noinspection ConstantConditions
+    findViewById(R.id.closeButton).setOnClickListener(new View.OnClickListener() {
+      @Override public void onClick(View v) {
+        drawerBehavior.close();
+      }
+    });
   }
 }

sample/src/main/res/layout/drawer_behavior.xml

@@ -6,11 +6,29 @@
     android:layout_height="match_parent"
     android:background="#feee"
     >
-  <View
+  <FrameLayout
+      android:id="@+id/drawerView"
       android:layout_width="200dp"
       android:layout_height="match_parent"
       android:layout_gravity="start"
       android:background="#ff00"
       app:layout_behavior="com.jakewharton.behavior.drawer.DrawerBehavior"
+      >
+    <Button
+        android:id="@+id/closeButton"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="bottom|center_horizontal"
+        android:text="Close drawer"
+        />
+
+  </FrameLayout>
+
+  <Button
+      android:id="@+id/openButton"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:layout_gravity="center"
+      android:text="Open drawer"
       />
 </android.support.design.widget.CoordinatorLayout>