package com.tencent.tws.assistant.widget;
import com.tencent.tws.sharelib.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
import android.widget.LinearLayout;
public class SegmentBar extends LinearLayout {
// holds the checked id; the selection is empty by default
private int mCheckedId = -1;
// tracks children radio buttons checked state
private SegmentButton.OnCheckedChangeListener mChildOnCheckedChangeListener;
// when true, mOnCheckedChangeListener discards events
private boolean mProtectFromCheckedChange = false;
private OnCheckedChangeListener mOnCheckedChangeListener;
private PassThroughHierarchyChangeListener mPassThroughListener;
public SegmentBar(Context context) {
this(context, null);
}
public SegmentBar(Context context, AttributeSet attrs) {
this(context, attrs, R.attr.segmentBarStyle);
}
public SegmentBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// retrieve selected radio button as requested by the user in the
// XML layout file
TypedArray attributes = context.obtainStyledAttributes(attrs, R.styleable.SegmentBar, defStyle, 0);
int value = attributes.getResourceId(R.styleable.SegmentBar_checkedButton, View.NO_ID);
if (value != View.NO_ID) {
mCheckedId = value;
}
attributes.recycle();
init();
}
private void init() {
mChildOnCheckedChangeListener = new CheckedStateTracker();
mPassThroughListener = new PassThroughHierarchyChangeListener();
super.setOnHierarchyChangeListener(mPassThroughListener);
}
/**
* {@inheritDoc}
*/
@Override
public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) {
// the user listener is delegated to our pass-through listener
mPassThroughListener.mOnHierarchyChangeListener = listener;
}
/**
* {@inheritDoc}
*/
@Override
protected void onFinishInflate() {
super.onFinishInflate();
// checks the appropriate radio button as requested in the XML file
if (mCheckedId != -1) {
mProtectFromCheckedChange = true;
setCheckedStateForView(mCheckedId, true);
mProtectFromCheckedChange = false;
setCheckedId(mCheckedId);
}
updateChildBackgroundState();
}
@Override
public void addView(View child, int index, ViewGroup.LayoutParams params) {
if (child instanceof SegmentButton) {
final SegmentButton button = (SegmentButton) child;
if (button.isChecked()) {
mProtectFromCheckedChange = true;
if (mCheckedId != -1) {
setCheckedStateForView(mCheckedId, false);
}
mProtectFromCheckedChange = false;
setCheckedId(button.getId());
}
}
super.addView(child, index, params);
updateChildBackgroundState();
}
public void updateChildBackgroundState() {
int count = super.getChildCount();
if (count > 1) {
if (getOrientation() == LinearLayout.VERTICAL) {
updateChildBackgroundState(super.getChildAt(0), SegmentButton.STATE_VERTICAL_FIRST);
for (int i = 1; i < count - 1; i++) {
updateChildBackgroundState(super.getChildAt(i), SegmentButton.STATE_VERTICAL_MIDDLE);
}
updateChildBackgroundState(super.getChildAt(count - 1), SegmentButton.STATE_VERTICAL_LAST);
} else {
updateChildBackgroundState(super.getChildAt(0), SegmentButton.STATE_HORIZONTAL_FIRST);
for (int i = 1; i < count - 1; i++) {
updateChildBackgroundState(super.getChildAt(i), SegmentButton.STATE_HORIZONTAL_MIDDLE);
}
updateChildBackgroundState(super.getChildAt(count - 1), SegmentButton.STATE_HORIZONTAL_LAST);
}
} else {
if (getOrientation() == LinearLayout.VERTICAL) {
updateChildBackgroundState(super.getChildAt(0), SegmentButton.STATE_VERTICAL_SINGLE);
} else {
updateChildBackgroundState(super.getChildAt(0), SegmentButton.STATE_HORIZONTAL_SINGLE);
}
}
}
public void updateChildBackgroundState(View view, int childState) {
if (view !=null && view instanceof SegmentButton) {
((SegmentButton) view).setBackgroundState(childState);
}
}
/**
* <p>
* Sets the selection to the radio button whose identifier is passed in parameter. Using -1 as the
* selection identifier clears the selection; such an operation is equivalent to invoking
* {@link #clearCheck()}.
* </p>
*
* @param id
* the unique id of the radio button to select in this group
*
* @see #getCheckedRadioButtonId()
* @see #clearCheck()
*/
public void check(int id) {
// don't even bother
if (id != -1 && (id == mCheckedId)) {
return;
}
if (mCheckedId != -1) {
setCheckedStateForView(mCheckedId, false);
}
if (id != -1) {
setCheckedStateForView(id, true);
}
setCheckedId(id);
}
private void setCheckedId(int id) {
mCheckedId = id;
if (mOnCheckedChangeListener != null) {
mOnCheckedChangeListener.onCheckedChanged(this, mCheckedId);
}
}
private void setCheckedStateForView(int viewId, boolean checked) {
View checkedView = findViewById(viewId);
if (checkedView != null && checkedView instanceof SegmentButton) {
((SegmentButton) checkedView).setChecked(checked);
}
}
/**
* <p>
* Returns the identifier of the selected radio button in this group. Upon empty selection, the returned
* value is -1.
* </p>
*
* @return the unique id of the selected radio button in this group
*
* @see #check(int)
* @see #clearCheck()
*
* @attr ref android.R.styleable#RadioGroup_checkedButton
*/
public int getCheckedSegmentButtonId() {
return mCheckedId;
}
/**
* <p>
* Clears the selection. When the selection is cleared, no radio button in this group is selected and
* {@link #getCheckedRadioButtonId()} returns null.
* </p>
*
* @see #check(int)
* @see #getCheckedRadioButtonId()
*/
public void clearCheck() {
check(-1);
}
/**
* <p>
* Register a callback to be invoked when the checked radio button changes in this group.
* </p>
*
* @param listener
* the callback to call on checked state change
*/
public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
mOnCheckedChangeListener = listener;
}
/**
* {@inheritDoc}
*/
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new SegmentBar.LayoutParams(getContext(), attrs);
}
/**
* {@inheritDoc}
*/
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof SegmentBar.LayoutParams;
}
@Override
protected LinearLayout.LayoutParams generateDefaultLayoutParams() {
return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
}
@Override
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(event);
event.setClassName(SegmentBar.class.getName());
}
@Override
public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
super.onInitializeAccessibilityNodeInfo(info);
info.setClassName(SegmentBar.class.getName());
}
/**
* <p>
* This set of layout parameters defaults the width and the height of the children to
* {@link #WRAP_CONTENT} when they are not specified in the XML file. Otherwise, this class ussed the
* value read from the XML file.
* </p>
*
* <p>
* See {@link android.R.styleable#LinearLayout_Layout LinearLayout Attributes} for a list of all child
* view attributes that this class supports.
* </p>
*
*/
public static class LayoutParams extends LinearLayout.LayoutParams {
/**
* {@inheritDoc}
*/
public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
}
/**
* {@inheritDoc}
*/
public LayoutParams(int w, int h) {
super(w, h);
}
/**
* {@inheritDoc}
*/
public LayoutParams(int w, int h, float initWeight) {
super(w, h, initWeight);
}
/**
* {@inheritDoc}
*/
public LayoutParams(ViewGroup.LayoutParams p) {
super(p);
}
/**
* {@inheritDoc}
*/
public LayoutParams(MarginLayoutParams source) {
super(source);
}
/**
* <p>
* Fixes the child's width to {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT} and the child's
* height to {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT} when not specified in the XML
* file.
* </p>
*
* @param a
* the styled attributes set
* @param widthAttr
* the width attribute to fetch
* @param heightAttr
* the height attribute to fetch
*/
@Override
protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) {
if (a.hasValue(widthAttr)) {
width = a.getLayoutDimension(widthAttr, "layout_width");
} else {
width = WRAP_CONTENT;
}
if (a.hasValue(heightAttr)) {
height = a.getLayoutDimension(heightAttr, "layout_height");
} else {
height = WRAP_CONTENT;
}
}
}
/**
* <p>
* Interface definition for a callback to be invoked when the checked radio button changed in this group.
* </p>
*/
public interface OnCheckedChangeListener {
/**
* <p>
* Called when the checked radio button has changed. When the selection is cleared, checkedId is -1.
* </p>
*
* @param group
* the group in which the checked radio button has changed
* @param checkedId
* the unique identifier of the newly checked radio button
*/
public void onCheckedChanged(SegmentBar group, int checkedId);
}
private class CheckedStateTracker implements SegmentButton.OnCheckedChangeListener {
public void onCheckedChanged(SegmentButton buttonView, boolean isChecked) {
// prevents from infinite recursion
if (mProtectFromCheckedChange) {
return;
}
mProtectFromCheckedChange = true;
if (mCheckedId != -1) {
setCheckedStateForView(mCheckedId, false);
}
mProtectFromCheckedChange = false;
int id = buttonView.getId();
setCheckedId(id);
}
}
/**
* <p>
* A pass-through listener acts upon the events and dispatches them to another listener. This allows the
* table layout to set its own internal hierarchy change listener without preventing the user to setup
* his.
* </p>
*/
private class PassThroughHierarchyChangeListener implements ViewGroup.OnHierarchyChangeListener {
private ViewGroup.OnHierarchyChangeListener mOnHierarchyChangeListener;
/**
* {@inheritDoc}
*/
public void onChildViewAdded(View parent, View child) {
if (parent == SegmentBar.this && child instanceof SegmentButton) {
int id = child.getId();
// generates an id if it's missing
if (id == View.NO_ID) {
id = View.generateViewId();
child.setId(id);
}
((SegmentButton) child).setOnCheckedChangeWidgetListener(mChildOnCheckedChangeListener);
}
if (mOnHierarchyChangeListener != null) {
mOnHierarchyChangeListener.onChildViewAdded(parent, child);
}
}
/**
* {@inheritDoc}
*/
public void onChildViewRemoved(View parent, View child) {
if (parent == SegmentBar.this && child instanceof SegmentButton) {
((SegmentButton) child).setOnCheckedChangeWidgetListener(null);
}
if (mOnHierarchyChangeListener != null) {
mOnHierarchyChangeListener.onChildViewRemoved(parent, child);
}
}
}
}