Merge pull request #13 from stepstone-tech/bugfix/issue-12

Scroll to current tab on tab selection

Author: fabiozo

README.md

@@ -11,7 +11,7 @@ Quoting the [documentation](https://www.google.com/design/spec/components/steppe
 
 ## Download (from JCenter)
 ```groovy
-compile 'com.stepstone.stepper:material-stepper:1.0.1'
+compile 'com.stepstone.stepper:material-stepper:1.0.2'
 ```
 
 ## Supported steppers

gradle.properties

@@ -19,4 +19,4 @@
 
 POM_GROUP_ID=com.stepstone.stepper
 POM_ARTIFACT_ID=material-stepper
-POM_VERSION=1.0.1
+POM_VERSION=1.0.2

material-stepper/src/main/java/com/stepstone/stepper/internal/TabsContainer.java

@@ -27,6 +27,7 @@
 import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.FrameLayout;
+import android.widget.HorizontalScrollView;
 import android.widget.LinearLayout;
 
 import com.stepstone.stepper.R;
@@ -68,6 +69,10 @@ public void onTabClicked(int position) {
 
     private int mDividerWidth = StepperLayout.DEFAULT_TAB_DIVIDER_WIDTH;
 
+    private final int mContainerLateralPadding;
+
+    private HorizontalScrollView mTabsScrollView;
+
     private LinearLayout mTabsInnerContainer;
 
     private TabItemListener mListener = TabItemListener.NULL;
@@ -101,8 +106,10 @@ public TabsContainer(Context context, AttributeSet attrs, int defStyleAttr) {
 
             a.recycle();
         }
+        mContainerLateralPadding = context.getResources().getDimensionPixelOffset(R.dimen.ms_tabs_container_lateral_padding);
 
         mTabsInnerContainer = (LinearLayout) findViewById(R.id.ms_stepTabsInnerContainer);
+        mTabsScrollView = (HorizontalScrollView) findViewById(R.id.ms_stepTabsScrollView);
     }
 
     public void setUnselectedColor(@ColorInt int unselectedColor) {
@@ -146,6 +153,9 @@ public void setCurrentStep(int newStepPosition) {
             boolean done = i < newStepPosition;
             final boolean current = i == newStepPosition;
             childTab.updateState(done, current);
+            if (current) {
+                mTabsScrollView.smoothScrollTo(childTab.getLeft() - mContainerLateralPadding, 0);
+            }
         }
     }
 

material-stepper/src/main/res/layout/ms_tabs_container.xml

@@ -3,6 +3,7 @@
     xmlns:android="http://schemas.android.com/apk/res/android">
 
     <HorizontalScrollView
+        android:id="@+id/ms_stepTabsScrollView"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="center_horizontal"