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