Android Open Source - android-utils Divided Linear Layout

• Back to Development/utility  ↑

From Project

Back to project page android-utils.

License

The source code is released under:

Apache License

Java Source Code

package com.omegar.android.utils.components;
//from  w w  w . ja  v a2s  . c om
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;

import com.omegar.android.utils.R;

public class DividedLinearLayout extends LinearLayout {

  /**
   * Don't show any dividers.
   */
  public static final int SHOW_DIVIDER_NONE = 0;
  /**
   * Show a divider at the beginning of the group.
   */
  public static final int SHOW_DIVIDER_BEGINNING = 1;
  /**
   * Show dividers between each item in the group.
   */
  public static final int SHOW_DIVIDER_MIDDLE = 2;
  /**
   * Show a divider at the end of the group.
   */
  public static final int SHOW_DIVIDER_END = 4;

  private Drawable mDivider;
  private int mDividerWidth;
  private int mDividerHeight;
  private int mShowDividers;
  private int mDividerPadding;

  public DividedLinearLayout(Context context, AttributeSet attrs) {
    this(context, attrs, R.attr.dividedLinearLayoutStyle);
  }
  
  public DividedLinearLayout(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs);

    TypedArray a = context.obtainStyledAttributes(attrs,
        R.styleable.DividedLinearLayout, defStyle, 0);

    mShowDividers = a.getInt(R.styleable.DividedLinearLayout_showDivider,
        SHOW_DIVIDER_MIDDLE);

    Drawable drawable = a
        .getDrawable(R.styleable.DividedLinearLayout_android_divider);

    setDividerDrawable(drawable);

    mDividerPadding = a.getDimensionPixelSize(
        R.styleable.DividedLinearLayout_android_dividerPadding, 0);
    a.recycle();
  }

  /**
   * Set how dividers should be shown between items in this layout
   * 
   * @param showDividers
   *            One or more of {@link #SHOW_DIVIDER_BEGINNING},
   *            {@link #SHOW_DIVIDER_MIDDLE}, or {@link #SHOW_DIVIDER_END}, or
   *            {@link #SHOW_DIVIDER_NONE} to show no dividers.
   */
  public void setShowDividers(int showDividers) {
    if (showDividers != mShowDividers) {
      requestLayout();
      invalidate(); // XXX This is required if you are toggling a divider
              // off
    }
    mShowDividers = showDividers;
  }

  /**
   * @return A flag set indicating how dividers should be shown around items.
   * @see #setShowDividers(int)
   */
  public int getShowDividers() {
    return mShowDividers;
  }

  /**
   * Set a drawable to be used as a divider between items.
   * 
   * @param divider
   *            Drawable that will divide each item.
   * @see #setShowDividers(int)
   */
  public void setDividerDrawable(Drawable divider) {
    if (divider == mDivider) {
      return;
    }

    mDivider = divider;
    if (divider != null) {
      if (mDivider instanceof ColorDrawable) {
        mDividerHeight = 1;
        mDividerWidth = 1;
      } else {
        mDividerWidth = divider.getIntrinsicWidth();
        mDividerHeight = divider.getIntrinsicHeight();
      }
    } else {
      mDividerWidth = 0;
      mDividerHeight = 0;
    }
    setWillNotDraw(divider == null);
    requestLayout();
  }

  /**
   * Set padding displayed on both ends of dividers.
   * 
   * @param padding
   *            Padding value in pixels that will be applied to each end
   * 
   * @see #setShowDividers(int)
   * @see #setDividerDrawable(Drawable)
   * @see #getDividerPadding()
   */
  public void setDividerPadding(int padding) {
    mDividerPadding = padding;
  }

  /**
   * Get the padding size used to inset dividers in pixels
   * 
   * @see #setShowDividers(int)
   * @see #setDividerDrawable(Drawable)
   * @see #setDividerPadding(int)
   */
  public int getDividerPadding() {
    return mDividerPadding;
  }

  /**
   * Get the width of the current divider drawable.
   * 
   * @hide Used internally by framework.
   */
  public int getDividerWidth() {
    return mDividerWidth;
  }

  private void setLayoutParamsForChild(View view) {
    final int index = indexOfChild(view);
    final int orientation = getOrientation();
    final LayoutParams params = (LayoutParams) view.getLayoutParams();
    if (hasDividerBeforeChildAt(index)) {
      if (orientation == VERTICAL) {
        // Account for the divider by pushing everything up
        params.topMargin += mDividerHeight;
      } else {
        // Account for the divider by pushing everything left
        params.leftMargin = mDividerWidth;
      }
    }

    final int count = getChildCount();
    if (index == count - 1) {
      if (hasDividerBeforeChildAt(count)) {
        if (orientation == VERTICAL) {
          params.bottomMargin += mDividerHeight;
        } else {
          params.rightMargin += mDividerWidth;
        }
      }
    }
  }

  @Override
  public void addView(View child, android.view.ViewGroup.LayoutParams params) {
    super.addView(child, params);
    setLayoutParamsForChild(child);
  }

  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    if (mDivider != null) {
      if (getOrientation() == VERTICAL) {
        drawDividersVertical(canvas);
      } else {
        drawDividersHorizontal(canvas);
      }
    }
  }

  void drawDividersVertical(Canvas canvas) {
    final int count = getChildCount();
    for (int i = 0; i < count; i++) {
      final View child = getChildAt(i);

      if (child != null && child.getVisibility() != GONE) {
        if (hasDividerBeforeChildAt(i)) {
          final LayoutParams lp = (LayoutParams) child
              .getLayoutParams();
          final int top = child.getTop() - lp.topMargin/*
                                 * -
                                 * mDividerHeight
                                 */;
          drawHorizontalDivider(canvas, top);
        }
      }
    }

    if (hasDividerBeforeChildAt(count)) {
      final View child = getChildAt(count - 1);
      int bottom = 0;
      if (child == null) {
        bottom = getHeight() - getPaddingBottom() - mDividerHeight;
      } else {
        // final LayoutParams lp = (LayoutParams)
        // child.getLayoutParams();
        bottom = child.getBottom()/* + lp.bottomMargin */;
      }
      drawHorizontalDivider(canvas, bottom);
    }
  }

  void drawDividersHorizontal(Canvas canvas) {
    final int count = getChildCount();
    for (int i = 0; i < count; i++) {
      final View child = getChildAt(i);

      if (child != null && child.getVisibility() != GONE) {
        if (hasDividerBeforeChildAt(i)) {
          final LayoutParams lp = (LayoutParams) child
              .getLayoutParams();
          final int left = child.getLeft() - lp.leftMargin/*
                                   * -
                                   * mDividerWidth
                                   */;
          drawVerticalDivider(canvas, left);
        }
      }
    }

    if (hasDividerBeforeChildAt(count)) {
      final View child = getChildAt(count - 1);
      int right = 0;
      if (child == null) {
        right = getWidth() - getPaddingRight() - mDividerWidth;
      } else {
        // final LayoutParams lp = (LayoutParams)
        // child.getLayoutParams();
        right = child.getRight()/* + lp.rightMargin */;
      }
      drawVerticalDivider(canvas, right);
    }
  }

  void drawHorizontalDivider(Canvas canvas, int top) {
    mDivider.setBounds(getPaddingLeft() + mDividerPadding, top, getWidth()
        - getPaddingRight() - mDividerPadding, top + mDividerHeight);
    mDivider.draw(canvas);
  }

  void drawVerticalDivider(Canvas canvas, int left) {
    mDivider.setBounds(left, getPaddingTop() + mDividerPadding, left
        + mDividerWidth, getHeight() - getPaddingBottom()
        - mDividerPadding);
    mDivider.draw(canvas);
  }

  /**
   * Determines where to position dividers between children.
   * 
   * @param childIndex
   *            Index of child to check for preceding divider
   * @return true if there should be a divider before the child at childIndex
   * @hide Pending API consideration. Currently only used internally by the
   *       system.
   */
  protected boolean hasDividerBeforeChildAt(int childIndex) {
    if (childIndex == 0) {
      return (mShowDividers & SHOW_DIVIDER_BEGINNING) != 0;
    } else if (childIndex == getChildCount()) {
      return (mShowDividers & SHOW_DIVIDER_END) != 0;
    } else if ((mShowDividers & SHOW_DIVIDER_MIDDLE) != 0) {
      boolean hasVisibleViewBefore = false;
      for (int i = childIndex - 1; i >= 0; i--) {
        if (getChildAt(i).getVisibility() != GONE) {
          hasVisibleViewBefore = true;
          break;
        }
      }
      return hasVisibleViewBefore;
    }
    return false;
  }
}

Java Source Code List

• Back to Development/utility  ↑