| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.tv.menu; |
| |
| import android.content.Context; |
| import android.content.res.Resources; |
| import android.graphics.Rect; |
| import android.support.annotation.NonNull; |
| import android.util.AttributeSet; |
| import android.util.Log; |
| import android.util.TypedValue; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.LinearLayout; |
| import android.widget.TextView; |
| import com.android.tv.R; |
| import com.android.tv.menu.Menu.MenuShowReason; |
| |
| public abstract class MenuRowView extends LinearLayout { |
| private static final String TAG = "MenuRowView"; |
| private static final boolean DEBUG = false; |
| |
| private TextView mTitleView; |
| private View mContentsView; |
| |
| private final float mTitleViewAlphaDeselected; |
| private final float mTitleViewScaleSelected; |
| |
| /** |
| * The lastly focused view. It is used to keep the focus while navigating the menu rows and |
| * reset when the menu is popped up. |
| */ |
| private View mLastFocusView; |
| |
| private MenuRow mRow; |
| |
| private final OnFocusChangeListener mOnFocusChangeListener = |
| new OnFocusChangeListener() { |
| @Override |
| public void onFocusChange(View v, boolean hasFocus) { |
| onChildFocusChange(v, hasFocus); |
| } |
| }; |
| |
| /** Returns the alpha value of the title view when it's deselected. */ |
| public float getTitleViewAlphaDeselected() { |
| return mTitleViewAlphaDeselected; |
| } |
| |
| /** Returns the scale value of the title view when it's selected. */ |
| public float getTitleViewScaleSelected() { |
| return mTitleViewScaleSelected; |
| } |
| |
| public MenuRowView(Context context) { |
| this(context, null); |
| } |
| |
| public MenuRowView(Context context, AttributeSet attrs) { |
| this(context, attrs, 0); |
| } |
| |
| public MenuRowView(Context context, AttributeSet attrs, int defStyleAttr) { |
| this(context, attrs, defStyleAttr, 0); |
| } |
| |
| public MenuRowView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { |
| super(context, attrs, defStyleAttr, defStyleRes); |
| Resources res = context.getResources(); |
| TypedValue outValue = new TypedValue(); |
| res.getValue(R.dimen.menu_row_title_alpha_deselected, outValue, true); |
| mTitleViewAlphaDeselected = outValue.getFloat(); |
| float textSizeSelected = |
| res.getDimensionPixelSize(R.dimen.menu_row_title_text_size_selected); |
| float textSizeDeselected = |
| res.getDimensionPixelSize(R.dimen.menu_row_title_text_size_deselected); |
| mTitleViewScaleSelected = textSizeSelected / textSizeDeselected; |
| } |
| |
| @Override |
| protected void onFinishInflate() { |
| super.onFinishInflate(); |
| mTitleView = (TextView) findViewById(R.id.title); |
| mContentsView = findViewById(getContentsViewId()); |
| if (mContentsView.isFocusable()) { |
| mContentsView.setOnFocusChangeListener(mOnFocusChangeListener); |
| } |
| if (mContentsView instanceof ViewGroup) { |
| setOnFocusChangeListenerToChildren((ViewGroup) mContentsView); |
| } |
| // Make contents view invisible in order that the view participates in the initial layout. |
| // The visibility is set to GONE after the first layout finishes. |
| // If not, we can't see the contents view animation for the first time it is shown. |
| // TODO: Find a better way to resolve this issue. |
| mContentsView.setVisibility(INVISIBLE); |
| } |
| |
| private void setOnFocusChangeListenerToChildren(ViewGroup parent) { |
| int childCount = parent.getChildCount(); |
| for (int i = 0; i < childCount; ++i) { |
| View child = parent.getChildAt(i); |
| if (child.isFocusable()) { |
| child.setOnFocusChangeListener(mOnFocusChangeListener); |
| } |
| if (child instanceof ViewGroup) { |
| setOnFocusChangeListenerToChildren((ViewGroup) child); |
| } |
| } |
| } |
| |
| protected abstract int getContentsViewId(); |
| |
| /** Returns the title view. */ |
| public final TextView getTitleView() { |
| return mTitleView; |
| } |
| |
| /** Returns the contents view. */ |
| public final View getContentsView() { |
| return mContentsView; |
| } |
| |
| /** |
| * Initialize this view. e.g. Set the initial selection. This method is called when the main |
| * menu is visible. Subclass of {@link MenuRowView} should override this to set correct |
| * mLastFocusView. |
| * |
| * @param reason A reason why this is initialized. See {@link MenuShowReason} |
| */ |
| public void initialize(@MenuShowReason int reason) { |
| mLastFocusView = null; |
| } |
| |
| protected Menu getMenu() { |
| return mRow == null ? null : mRow.getMenu(); |
| } |
| |
| public void onBind(MenuRow row) { |
| if (DEBUG) Log.d(TAG, "onBind: row=" + row); |
| mRow = row; |
| mTitleView.setText(row.getTitle()); |
| } |
| |
| @Override |
| protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) { |
| // Expand view here so initial focused item can be shown. |
| return getInitialFocusView().requestFocus(); |
| } |
| |
| @NonNull |
| private View getInitialFocusView() { |
| if (mLastFocusView == null) { |
| return mContentsView; |
| } |
| return mLastFocusView; |
| } |
| |
| /** |
| * Sets the view which needs to have focus when this row appears. Subclasses should call this in |
| * {@link #initialize} if needed. |
| */ |
| protected void setInitialFocusView(@NonNull View v) { |
| mLastFocusView = v; |
| } |
| |
| /** |
| * Called when the focus of a child view is changed. The inherited class should override this |
| * method instead of calling {@link |
| * android.view.View#setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. |
| */ |
| protected void onChildFocusChange(View v, boolean hasFocus) { |
| if (hasFocus) { |
| mLastFocusView = v; |
| } |
| } |
| |
| /** Returns the ID of row object bound to this view. */ |
| public String getRowId() { |
| return mRow == null ? null : mRow.getId(); |
| } |
| |
| /** |
| * Called when this row is selected. |
| * |
| * @param showTitle If {@code true}, the title is not hidden immediately after the row is |
| * selected even though hideTitleWhenSelected() is {@code true}. |
| */ |
| public void onSelected(boolean showTitle) { |
| if (mRow.hideTitleWhenSelected() && !showTitle) { |
| // Title view should participate in the layout even though it is not visible. |
| mTitleView.setVisibility(INVISIBLE); |
| } else { |
| mTitleView.setVisibility(VISIBLE); |
| mTitleView.setAlpha(1.0f); |
| mTitleView.setScaleX(mTitleViewScaleSelected); |
| mTitleView.setScaleY(mTitleViewScaleSelected); |
| } |
| // Making the content view visible will cause it to set a focus item |
| // So we store mLastFocusView and reset it |
| View lastFocusView = mLastFocusView; |
| mContentsView.setVisibility(VISIBLE); |
| mLastFocusView = lastFocusView; |
| } |
| |
| /** Called when this row is deselected. */ |
| public void onDeselected() { |
| mTitleView.setVisibility(VISIBLE); |
| mTitleView.setAlpha(mTitleViewAlphaDeselected); |
| mTitleView.setScaleX(1.0f); |
| mTitleView.setScaleY(1.0f); |
| mContentsView.setVisibility(GONE); |
| } |
| |
| /** Returns the preferred height of the contents view. The top/bottom padding is excluded. */ |
| public int getPreferredContentsHeight() { |
| return mRow.getHeight(); |
| } |
| } |