xref: /frameworks/support/v7/appcompat/src/android/support/v7/internal/widget/AbsActionBarView.java

/*
 * Copyright (C) 2011 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 android.support.appcompat.widget;

import android.content.Context;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Build;
import android.support.appcompat.R;
import android.support.appcompat.view.menu.ActionMenuPresenter;
import android.support.appcompat.view.menu.ActionMenuView;
import android.text.AndroidCharacter;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

public abstract class AbsActionBarView extends ViewGroup {
  protected ActionMenuView mMenuView;
  protected ActionMenuPresenter mActionMenuPresenter;
  protected ActionBarContainer mSplitView;
  protected boolean mSplitActionBar;
  protected boolean mSplitWhenNarrow;
  protected int mContentHeight;

  private static final int FADE_DURATION = 200;

  public AbsActionBarView(Context context) {
    super(context);
  }

  public AbsActionBarView(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  public AbsActionBarView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
  }

  @Override
  protected void onConfigurationChanged(Configuration newConfig) {
    if (Build.VERSION.SDK_INT >= 8) {
      super.onConfigurationChanged(newConfig);
    }

    // Action bar can change size on configuration changes.
    // Reread the desired height from the theme-specified style.
    TypedArray a = getContext().obtainStyledAttributes(null, R.styleable.ActionBar,
        R.attr.actionBarStyle, 0);
    setContentHeight(a.getLayoutDimension(R.styleable.ActionBar_height, 0));
    a.recycle();
    if (mSplitWhenNarrow) {
      setSplitActionBar(getContext().getResources().getBoolean(
          R.bool.split_action_bar_is_narrow));
    }
    if (mActionMenuPresenter != null) {
      mActionMenuPresenter.onConfigurationChanged(newConfig);
    }
  }

  /**
   * Sets whether the bar should be split right now, no questions asked.
   * @param split true if the bar should split
   */
  public void setSplitActionBar(boolean split) {
    mSplitActionBar = split;
  }

  /**
   * Sets whether the bar should split if we enter a narrow screen configuration.
   * @param splitWhenNarrow true if the bar should check to split after a config change
   */
  public void setSplitWhenNarrow(boolean splitWhenNarrow) {
    mSplitWhenNarrow = splitWhenNarrow;
  }

  public void setContentHeight(int height) {
    mContentHeight = height;
    requestLayout();
  }

  public int getContentHeight() {
    return mContentHeight;
  }

  public void setSplitView(ActionBarContainer splitView) {
    mSplitView = splitView;
  }

  /**
   * @return Current visibility or if animating, the visibility being animated to.
   */
  public int getAnimatedVisibility() {
    return getVisibility();
  }

  public void animateToVisibility(int visibility) {
    setVisibility(visibility);
  }

  @Override
  public void setVisibility(int visibility) {
    if (visibility != getVisibility()) {
      super.setVisibility(visibility);
    }
  }

  public boolean showOverflowMenu() {
    if (mActionMenuPresenter != null) {
      return mActionMenuPresenter.showOverflowMenu();
    }
    return false;
  }

  public void postShowOverflowMenu() {
    post(new Runnable() {
      public void run() {
        showOverflowMenu();
      }
    });
  }

  public boolean hideOverflowMenu() {
    if (mActionMenuPresenter != null) {
      return mActionMenuPresenter.hideOverflowMenu();
    }
    return false;
  }

  public boolean isOverflowMenuShowing() {
    if (mActionMenuPresenter != null) {
      return mActionMenuPresenter.isOverflowMenuShowing();
    }
    return false;
  }

  public boolean isOverflowReserved() {
    return mActionMenuPresenter != null && mActionMenuPresenter.isOverflowReserved();
  }

  public void dismissPopupMenus() {
    if (mActionMenuPresenter != null) {
      mActionMenuPresenter.dismissPopupMenus();
    }
  }

  protected int measureChildView(View child, int availableWidth, int childSpecHeight,
      int spacing) {
    child.measure(MeasureSpec.makeMeasureSpec(availableWidth, MeasureSpec.AT_MOST),
        childSpecHeight);

    availableWidth -= child.getMeasuredWidth();
    availableWidth -= spacing;

    return Math.max(0, availableWidth);
  }

  protected int positionChild(View child, int x, int y, int contentHeight) {
    int childWidth = child.getMeasuredWidth();
    int childHeight = child.getMeasuredHeight();
    int childTop = y + (contentHeight - childHeight) / 2;

    child.layout(x, childTop, x + childWidth, childTop + childHeight);

    return childWidth;
  }

  protected int positionChildInverse(View child, int x, int y, int contentHeight) {
    int childWidth = child.getMeasuredWidth();
    int childHeight = child.getMeasuredHeight();
    int childTop = y + (contentHeight - childHeight) / 2;

    child.layout(x - childWidth, childTop, x, childTop + childHeight);

    return childWidth;
  }

}