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Commit 35931974 authored by menghanli's avatar menghanli
Browse files

Create palette preview for color correction (2/n). 

Limit the preview measure for one time to avoid unnecessary
measure and draw performance.

Bug: 145968068
Test: make RunSettingsRoboTests ROBOTEST_FILTER=PaletteListViewTest
Test: make RunSettingsRoboTests2
Change-Id: Ib8ea13e511351c71babcbd1376817cea3a47cac4
parent d2fe0412

src/com/android/settings/accessibility/PaletteListPreference.java

+37 −18
Original line number Diff line number Diff line
@@ -31,6 +31,9 @@ import com.android.settingslib.widget.R; 
/** Preference that easier preview by matching name to color. */

public class PaletteListPreference extends Preference {



    private ListView mListView;

    private ViewTreeObserver.OnPreDrawListener mPreDrawListener;



    /**

     * Constructs a new PaletteListPreference with the given context's theme and the supplied

     * attribute set.
@@ -58,6 +61,7 @@ public class PaletteListPreference extends Preference { 
    public PaletteListPreference(Context context, AttributeSet attrs, int defStyleAttr) {

        super(context, attrs, defStyleAttr);

        setLayoutResource(R.layout.daltonizer_preview);

        initPreDrawListener();

    }



    @Override
@@ -65,24 +69,39 @@ public class PaletteListPreference extends Preference { 
        super.onBindViewHolder(holder);



        final View rootView = holder.itemView;

        final ListView listView = rootView.findViewById(R.id.palette_listView);

        listView.getViewTreeObserver().addOnGlobalLayoutListener(

                new ViewTreeObserver.OnGlobalLayoutListener() {

        mListView = rootView.findViewById(R.id.palette_listView);

        if (mPreDrawListener != null) {

            mListView.getViewTreeObserver().addOnPreDrawListener(mPreDrawListener);

        }

    }



    private void initPreDrawListener() {

        mPreDrawListener = new ViewTreeObserver.OnPreDrawListener() {

            @Override

                    public void onGlobalLayout() {

                        final int listViewHeight = listView.getMeasuredHeight();

                        final int listViewWidth = listView.getMeasuredWidth();

            public boolean onPreDraw() {

                if (mListView == null) {

                    return false;

                }



                final int listViewHeight = mListView.getMeasuredHeight();

                final int listViewWidth = mListView.getMeasuredWidth();



                // Removes the callback after get result of measure view.

                        listView.getViewTreeObserver().removeOnGlobalLayoutListener(this);

                final ViewTreeObserver viewTreeObserver = mListView.getViewTreeObserver();

                if (viewTreeObserver.isAlive()) {

                    viewTreeObserver.removeOnPreDrawListener(this);

                }

                mPreDrawListener = null;



                // Resets layout parameters to display whole items from listView.

                final FrameLayout.LayoutParams layoutParams =

                                (FrameLayout.LayoutParams) listView.getLayoutParams();

                        layoutParams.height = listViewHeight * listView.getAdapter().getCount();

                        (FrameLayout.LayoutParams) mListView.getLayoutParams();

                layoutParams.height = listViewHeight * mListView.getAdapter().getCount();

                layoutParams.width = listViewWidth;

                        listView.setLayoutParams(layoutParams);

                        listView.invalidateViews();

                mListView.setLayoutParams(layoutParams);



                return true;

            }

                });

        };

    }

}