1 package android.support.v17.leanback.widget; 2 3 import android.content.Context; 4 import android.content.res.TypedArray; 5 import android.graphics.Paint; 6 import android.graphics.drawable.Drawable; 7 import android.support.v17.leanback.R; 8 import android.util.AttributeSet; 9 import android.widget.ImageView; 10 import android.widget.RelativeLayout; 11 import android.widget.TextView; 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 * @hide 21 */ 22 class GuidanceStylingRelativeLayout extends RelativeLayout { 23 private float mTitleKeylinePercent; 24 GuidanceStylingRelativeLayout(Context context)25 public GuidanceStylingRelativeLayout(Context context) { 26 this(context, null); 27 } 28 GuidanceStylingRelativeLayout(Context context, AttributeSet attrs)29 public GuidanceStylingRelativeLayout(Context context, AttributeSet attrs) { 30 this(context, attrs, 0); 31 } 32 GuidanceStylingRelativeLayout(Context context, AttributeSet attrs, int defStyle)33 public GuidanceStylingRelativeLayout(Context context, AttributeSet attrs, int defStyle) { 34 super(context, attrs, defStyle); 35 init(); 36 } 37 init()38 private void init() { 39 TypedArray ta = getContext().getTheme().obtainStyledAttributes( 40 R.styleable.LeanbackGuidedStepTheme); 41 mTitleKeylinePercent = ta.getFloat(R.styleable.LeanbackGuidedStepTheme_guidedStepKeyline, 42 40); 43 ta.recycle(); 44 } 45 46 @Override onLayout(boolean changed, int l, int t, int r, int b)47 protected void onLayout(boolean changed, int l, int t, int r, int b) { 48 super.onLayout(changed, l, t, r, b); 49 50 TextView mTitleView = (TextView) getRootView().findViewById(R.id.guidance_title); 51 TextView mBreadcrumbView = (TextView) getRootView().findViewById(R.id.guidance_breadcrumb); 52 TextView mDescriptionView = (TextView) getRootView().findViewById( 53 R.id.guidance_description); 54 ImageView mIconView = (ImageView) getRootView().findViewById(R.id.guidance_icon); 55 int mTitleKeylinePixels = (int) (getMeasuredHeight() * mTitleKeylinePercent / 100); 56 57 if (mTitleView != null && mTitleView.getParent() == this) { 58 Paint textPaint = mTitleView.getPaint(); 59 int titleViewTextHeight = -textPaint.getFontMetricsInt().top; 60 int mBreadcrumbViewHeight = mBreadcrumbView.getMeasuredHeight(); 61 int guidanceTextContainerTop = mTitleKeylinePixels 62 - titleViewTextHeight - mBreadcrumbViewHeight - mTitleView.getPaddingTop(); 63 int offset = guidanceTextContainerTop - mBreadcrumbView.getTop(); 64 65 if (mBreadcrumbView != null && mBreadcrumbView.getParent() == this) { 66 mBreadcrumbView.offsetTopAndBottom(offset); 67 } 68 69 mTitleView.offsetTopAndBottom(offset); 70 71 if (mDescriptionView != null && mDescriptionView.getParent() == this) { 72 mDescriptionView.offsetTopAndBottom(offset); 73 } 74 } 75 76 if (mIconView != null && mIconView.getParent() == this) { 77 Drawable drawable = mIconView.getDrawable(); 78 if (drawable != null) { 79 mIconView.offsetTopAndBottom( 80 mTitleKeylinePixels - mIconView.getMeasuredHeight() / 2); 81 } 82 } 83 } 84 } 85