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

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This commit is contained in:
Menghan Li
2020-01-16 15:12:26 +00:00
committed by Android (Google) Code Review
parent 5f964f1886 35931974eb
commit f70d04ea0a
1 changed files with 37 additions and 18 deletions
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55
src/com/android/settings/accessibility/PaletteListPreference.java
View File

@@ -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() {
@Override
public void onGlobalLayout() {
final int listViewHeight = listView.getMeasuredHeight();
final int listViewWidth = listView.getMeasuredWidth();
// Removes the callback after get result of measure view.
listView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
mListView = rootView.findViewById(R.id.palette_listView);
if (mPreDrawListener != null) {
mListView.getViewTreeObserver().addOnPreDrawListener(mPreDrawListener);
}
}
// Resets layout parameters to display whole items from listView.
final FrameLayout.LayoutParams layoutParams =
(FrameLayout.LayoutParams) listView.getLayoutParams();
layoutParams.height = listViewHeight * listView.getAdapter().getCount();
layoutParams.width = listViewWidth;
listView.setLayoutParams(layoutParams);
listView.invalidateViews();
}
});
private void initPreDrawListener() {
mPreDrawListener = new ViewTreeObserver.OnPreDrawListener() {
@Override
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.
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) mListView.getLayoutParams();
layoutParams.height = listViewHeight * mListView.getAdapter().getCount();
layoutParams.width = listViewWidth;
mListView.setLayoutParams(layoutParams);
return true;
}
};
}
}