Home | History | Annotate | Download | only in widget 
      1 package androidx.leanback.widget;
      2 
      3 import android.content.Context;
      4 import android.content.res.TypedArray;
      5 import android.graphics.drawable.Drawable;
      6 import android.util.AttributeSet;
      7 import android.view.View;
      8 import android.widget.ImageView;
      9 import android.widget.RelativeLayout;
     10 
     11 import androidx.leanback.R;
     12 
     13 /**
     14  * Relative layout implementation that lays out child views based on provided keyline percent(
     15  * distance of TitleView baseline from the top).
     16  *
     17  * Repositioning child views in PreDraw callback in {@link GuidanceStylist} was interfering with
     18  * fragment transition. To avoid that, we do that in the onLayout pass.
     19  */
     20 class GuidanceStylingRelativeLayout extends RelativeLayout {
     21     private float mTitleKeylinePercent;
     22 
     23     public GuidanceStylingRelativeLayout(Context context) {
     24         this(context, null);
     25     }
     26 
     27     public GuidanceStylingRelativeLayout(Context context, AttributeSet attrs) {
     28         this(context, attrs, 0);
     29     }
     30 
     31     public GuidanceStylingRelativeLayout(Context context, AttributeSet attrs, int defStyle) {
     32         super(context, attrs, defStyle);
     33         mTitleKeylinePercent = getKeyLinePercent(context);
     34     }
     35 
     36     public static float getKeyLinePercent(Context context) {
     37         TypedArray ta = context.getTheme().obtainStyledAttributes(
     38                 R.styleable.LeanbackGuidedStepTheme);
     39         float percent = ta.getFloat(R.styleable.LeanbackGuidedStepTheme_guidedStepKeyline, 40);
     40         ta.recycle();
     41         return percent;
     42     }
     43 
     44     @Override
     45     protected void onLayout(boolean changed, int l, int t, int r, int b) {
     46         super.onLayout(changed, l, t, r, b);
     47 
     48         View mTitleView = getRootView().findViewById(R.id.guidance_title);
     49         View mBreadcrumbView = getRootView().findViewById(R.id.guidance_breadcrumb);
     50         View mDescriptionView = getRootView().findViewById(
     51                 R.id.guidance_description);
     52         ImageView mIconView = getRootView().findViewById(R.id.guidance_icon);
     53         int mTitleKeylinePixels = (int) (getMeasuredHeight() * mTitleKeylinePercent / 100);
     54 
     55         if (mTitleView != null && mTitleView.getParent() == this) {
     56             int titleViewBaseline = mTitleView.getBaseline();
     57             int mBreadcrumbViewHeight = mBreadcrumbView.getMeasuredHeight();
     58             int guidanceTextContainerTop = mTitleKeylinePixels
     59                     - titleViewBaseline - mBreadcrumbViewHeight - mTitleView.getPaddingTop();
     60             int offset = guidanceTextContainerTop - mBreadcrumbView.getTop();
     61 
     62             if (mBreadcrumbView != null && mBreadcrumbView.getParent() == this) {
     63                 mBreadcrumbView.offsetTopAndBottom(offset);
     64             }
     65 
     66             mTitleView.offsetTopAndBottom(offset);
     67 
     68             if (mDescriptionView != null && mDescriptionView.getParent() == this) {
     69                 mDescriptionView.offsetTopAndBottom(offset);
     70             }
     71         }
     72 
     73         if (mIconView != null && mIconView.getParent() == this) {
     74             Drawable drawable = mIconView.getDrawable();
     75             if (drawable != null) {
     76                 mIconView.offsetTopAndBottom(
     77                         mTitleKeylinePixels - mIconView.getMeasuredHeight() / 2);
     78             }
     79         }
     80     }
     81 }
     82