package com.viewpagerindicator;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.graphics.drawable.Drawable;
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import android.view.View;
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import android.widget.LinearLayout;
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/**
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* A simple extension of a regular linear layout that supports the divider API
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* of Android 4.0+. The dividers are added adjacent to the children by changing
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* their layout params. If you need to rely on the margins which fall in the
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* same orientation as the layout you should wrap the child in a simple
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* {@link android.widget.FrameLayout} so it can receive the margin.
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*/
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class IcsLinearLayout extends LinearLayout {
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private static final int[] LL = new int[] {
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/* 0 */ android.R.attr.divider,
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/* 1 */ android.R.attr.showDividers,
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/* 2 */ android.R.attr.dividerPadding,
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};
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private static final int LL_DIVIDER = 0;
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private static final int LL_SHOW_DIVIDER = 1;
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private static final int LL_DIVIDER_PADDING = 2;
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private Drawable mDivider;
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private int mDividerWidth;
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private int mDividerHeight;
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private int mShowDividers;
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private int mDividerPadding;
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public IcsLinearLayout(Context context, int themeAttr) {
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super(context);
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TypedArray a = context.obtainStyledAttributes(null, LL, themeAttr, 0);
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setDividerDrawable(a.getDrawable(IcsLinearLayout.LL_DIVIDER));
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mDividerPadding = a.getDimensionPixelSize(LL_DIVIDER_PADDING, 0);
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mShowDividers = a.getInteger(LL_SHOW_DIVIDER, SHOW_DIVIDER_NONE);
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a.recycle();
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}
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public void setDividerDrawable(Drawable divider) {
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if (divider == mDivider) {
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return;
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}
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mDivider = divider;
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if (divider != null) {
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mDividerWidth = divider.getIntrinsicWidth();
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mDividerHeight = divider.getIntrinsicHeight();
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} else {
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mDividerWidth = 0;
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mDividerHeight = 0;
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}
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setWillNotDraw(divider == null);
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requestLayout();
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}
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@Override
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protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, int parentHeightMeasureSpec, int heightUsed) {
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final int index = indexOfChild(child);
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final int orientation = getOrientation();
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final LayoutParams params = (LayoutParams) child.getLayoutParams();
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if (hasDividerBeforeChildAt(index)) {
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if (orientation == VERTICAL) {
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//Account for the divider by pushing everything up
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params.topMargin = mDividerHeight;
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} else {
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//Account for the divider by pushing everything left
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params.leftMargin = mDividerWidth;
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}
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}
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final int count = getChildCount();
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if (index == count - 1) {
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if (hasDividerBeforeChildAt(count)) {
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if (orientation == VERTICAL) {
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params.bottomMargin = mDividerHeight;
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} else {
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params.rightMargin = mDividerWidth;
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}
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}
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}
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super.measureChildWithMargins(child, parentWidthMeasureSpec, widthUsed, parentHeightMeasureSpec, heightUsed);
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}
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@Override
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protected void onDraw(Canvas canvas) {
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if (mDivider != null) {
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if (getOrientation() == VERTICAL) {
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drawDividersVertical(canvas);
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} else {
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drawDividersHorizontal(canvas);
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}
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}
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super.onDraw(canvas);
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}
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private void drawDividersVertical(Canvas canvas) {
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final int count = getChildCount();
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for (int i = 0; i < count; i++) {
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final View child = getChildAt(i);
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if (child != null && child.getVisibility() != GONE) {
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if (hasDividerBeforeChildAt(i)) {
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final android.widget.LinearLayout.LayoutParams lp = (android.widget.LinearLayout.LayoutParams) child.getLayoutParams();
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final int top = child.getTop() - lp.topMargin/* - mDividerHeight*/;
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drawHorizontalDivider(canvas, top);
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}
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}
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}
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if (hasDividerBeforeChildAt(count)) {
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final View child = getChildAt(count - 1);
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int bottom = 0;
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if (child == null) {
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bottom = getHeight() - getPaddingBottom() - mDividerHeight;
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} else {
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//final LayoutParams lp = (LayoutParams) child.getLayoutParams();
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bottom = child.getBottom()/* + lp.bottomMargin*/;
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}
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drawHorizontalDivider(canvas, bottom);
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}
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}
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private void drawDividersHorizontal(Canvas canvas) {
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final int count = getChildCount();
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for (int i = 0; i < count; i++) {
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final View child = getChildAt(i);
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if (child != null && child.getVisibility() != GONE) {
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if (hasDividerBeforeChildAt(i)) {
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final android.widget.LinearLayout.LayoutParams lp = (android.widget.LinearLayout.LayoutParams) child.getLayoutParams();
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final int left = child.getLeft() - lp.leftMargin/* - mDividerWidth*/;
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drawVerticalDivider(canvas, left);
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}
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}
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}
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if (hasDividerBeforeChildAt(count)) {
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final View child = getChildAt(count - 1);
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int right = 0;
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if (child == null) {
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right = getWidth() - getPaddingRight() - mDividerWidth;
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} else {
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//final LayoutParams lp = (LayoutParams) child.getLayoutParams();
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right = child.getRight()/* + lp.rightMargin*/;
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}
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drawVerticalDivider(canvas, right);
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}
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}
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private void drawHorizontalDivider(Canvas canvas, int top) {
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mDivider.setBounds(getPaddingLeft() + mDividerPadding, top,
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getWidth() - getPaddingRight() - mDividerPadding, top + mDividerHeight);
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mDivider.draw(canvas);
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}
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private void drawVerticalDivider(Canvas canvas, int left) {
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mDivider.setBounds(left, getPaddingTop() + mDividerPadding,
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left + mDividerWidth, getHeight() - getPaddingBottom() - mDividerPadding);
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mDivider.draw(canvas);
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}
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private boolean hasDividerBeforeChildAt(int childIndex) {
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if (childIndex == 0 || childIndex == getChildCount()) {
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return false;
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}
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if ((mShowDividers & SHOW_DIVIDER_MIDDLE) != 0) {
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boolean hasVisibleViewBefore = false;
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for (int i = childIndex - 1; i >= 0; i--) {
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if (getChildAt(i).getVisibility() != GONE) {
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hasVisibleViewBefore = true;
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break;
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}
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}
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return hasVisibleViewBefore;
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}
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return false;
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}
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}
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