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package com.actionbarsherlock.internal.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;
import com.actionbarsherlock.internal.nineoldandroids.widget.NineLinearLayout;
/**
* 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.
*/
public class IcsLinearLayout extends NineLinearLayout {
private static final int[] R_styleable_LinearLayout = new int[] {
/* 0 */ android.R.attr.divider,
/* 1 */ android.R.attr.measureWithLargestChild,
/* 2 */ android.R.attr.showDividers,
/* 3 */ android.R.attr.dividerPadding,
};
private static final int LinearLayout_divider = 0;
private static final int LinearLayout_measureWithLargestChild = 1;
private static final int LinearLayout_showDividers = 2;
private static final int LinearLayout_dividerPadding = 3;
/**
* 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;
private boolean mUseLargestChild;
public IcsLinearLayout(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, /*com.android.internal.R.styleable.*/R_styleable_LinearLayout);
setDividerDrawable(a.getDrawable(/*com.android.internal.R.styleable.*/LinearLayout_divider));
mShowDividers = a.getInt(/*com.android.internal.R.styleable.*/LinearLayout_showDividers, SHOW_DIVIDER_NONE);
mDividerPadding = a.getDimensionPixelSize(/*com.android.internal.R.styleable.*/LinearLayout_dividerPadding, 0);
mUseLargestChild = a.getBoolean(/*com.android.internal.R.styleable.*/LinearLayout_measureWithLargestChild, false);
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) {
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;
}
@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);
}
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;
}
/**
* When true, all children with a weight will be considered having
* the minimum size of the largest child. If false, all children are
* measured normally.
*
* @return True to measure children with a weight using the minimum
* size of the largest child, false otherwise.
*
* @attr ref android.R.styleable#LinearLayout_measureWithLargestChild
*/
public boolean isMeasureWithLargestChildEnabled() {
return mUseLargestChild;
}
/**
* When set to true, all children with a weight will be considered having
* the minimum size of the largest child. If false, all children are
* measured normally.
*
* Disabled by default.
*
* @param enabled True to measure children with a weight using the
* minimum size of the largest child, false otherwise.
*
* @attr ref android.R.styleable#LinearLayout_measureWithLargestChild
*/
public void setMeasureWithLargestChildEnabled(boolean enabled) {
mUseLargestChild = enabled;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (mUseLargestChild) {
final int orientation = getOrientation();
switch (orientation) {
case HORIZONTAL:
useLargestChildHorizontal();
break;
case VERTICAL:
useLargestChildVertical();
break;
}
}
}
private void useLargestChildHorizontal() {
final int childCount = getChildCount();
// Find largest child width
int largestChildWidth = 0;
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
largestChildWidth = Math.max(child.getMeasuredWidth(), largestChildWidth);
}
int totalWidth = 0;
// Re-measure childs
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
if (child == null || child.getVisibility() == View.GONE) {
continue;
}
final LinearLayout.LayoutParams lp =
(LinearLayout.LayoutParams) child.getLayoutParams();
float childExtra = lp.weight;
if (childExtra > 0) {
child.measure(
MeasureSpec.makeMeasureSpec(largestChildWidth,
MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(child.getMeasuredHeight(),
MeasureSpec.EXACTLY));
totalWidth += largestChildWidth;
} else {
totalWidth += child.getMeasuredWidth();
}
totalWidth += lp.leftMargin + lp.rightMargin;
}
totalWidth += getPaddingLeft() + getPaddingRight();
setMeasuredDimension(totalWidth, getMeasuredHeight());
}
private void useLargestChildVertical() {
final int childCount = getChildCount();
// Find largest child width
int largestChildHeight = 0;
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
largestChildHeight = Math.max(child.getMeasuredHeight(), largestChildHeight);
}
int totalHeight = 0;
// Re-measure childs
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
if (child == null || child.getVisibility() == View.GONE) {
continue;
}
final LinearLayout.LayoutParams lp =
(LinearLayout.LayoutParams) child.getLayoutParams();
float childExtra = lp.weight;
if (childExtra > 0) {
child.measure(
MeasureSpec.makeMeasureSpec(child.getMeasuredWidth(),
MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(largestChildHeight,
MeasureSpec.EXACTLY));
totalHeight += largestChildHeight;
} else {
totalHeight += child.getMeasuredHeight();
}
totalHeight += lp.leftMargin + lp.rightMargin;
}
totalHeight += getPaddingLeft() + getPaddingRight();
setMeasuredDimension(getMeasuredWidth(), totalHeight);
}
}
