/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.widget;
import com.android.internal.R;
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.Gravity;
import android.view.ViewDebug;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
/**
* An extension to TextView that supports the {@link android.widget.Checkable} interface.
* This is useful when used in a {@link android.widget.ListView ListView} where the it's
* {@link android.widget.ListView#setChoiceMode(int) setChoiceMode} has been set to
* something other than {@link android.widget.ListView#CHOICE_MODE_NONE CHOICE_MODE_NONE}.
*
* @attr ref android.R.styleable#CheckedTextView_checked
* @attr ref android.R.styleable#CheckedTextView_checkMark
*/
public class CheckedTextView extends TextView implements Checkable {
private boolean mChecked;
private int mCheckMarkResource;
private Drawable mCheckMarkDrawable;
private int mBasePadding;
private int mCheckMarkWidth;
private boolean mNeedRequestlayout;
private static final int[] CHECKED_STATE_SET = {
R.attr.state_checked
};
public CheckedTextView(Context context) {
this(context, null);
}
public CheckedTextView(Context context, AttributeSet attrs) {
this(context, attrs, R.attr.checkedTextViewStyle);
}
public CheckedTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.CheckedTextView, defStyle, 0);
Drawable d = a.getDrawable(R.styleable.CheckedTextView_checkMark);
if (d != null) {
setCheckMarkDrawable(d);
}
boolean checked = a.getBoolean(R.styleable.CheckedTextView_checked, false);
setChecked(checked);
a.recycle();
}
public void toggle() {
setChecked(!mChecked);
}
@ViewDebug.ExportedProperty
public boolean isChecked() {
return mChecked;
}
/**
* <p>Changes the checked state of this text view.</p>
*
* @param checked true to check the text, false to uncheck it
*/
public void setChecked(boolean checked) {
if (mChecked != checked) {
mChecked = checked;
refreshDrawableState();
notifyAccessibilityStateChanged();
}
}
/**
* Set the checkmark to a given Drawable, identified by its resourece id. This will be drawn
* when {@link #isChecked()} is true.
*
* @param resid The Drawable to use for the checkmark.
*
* @see #setCheckMarkDrawable(Drawable)
* @see #getCheckMarkDrawable()
*
* @attr ref android.R.styleable#CheckedTextView_checkMark
*/
public void setCheckMarkDrawable(int resid) {
if (resid != 0 && resid == mCheckMarkResource) {
return;
}
mCheckMarkResource = resid;
Drawable d = null;
if (mCheckMarkResource != 0) {
d = getResources().getDrawable(mCheckMarkResource);
}
setCheckMarkDrawable(d);
}
/**
* Set the checkmark to a given Drawable. This will be drawn when {@link #isChecked()} is true.
*
* @param d The Drawable to use for the checkmark.
*
* @see #setCheckMarkDrawable(int)
* @see #getCheckMarkDrawable()
*
* @attr ref android.R.styleable#CheckedTextView_checkMark
*/
public void setCheckMarkDrawable(Drawable d) {
if (mCheckMarkDrawable != null) {
mCheckMarkDrawable.setCallback(null);
unscheduleDrawable(mCheckMarkDrawable);
}
mNeedRequestlayout = (d != mCheckMarkDrawable);
if (d != null) {
d.setCallback(this);
d.setVisible(getVisibility() == VISIBLE, false);
d.setState(CHECKED_STATE_SET);
setMinHeight(d.getIntrinsicHeight());
mCheckMarkWidth = d.getIntrinsicWidth();
d.setState(getDrawableState());
} else {
mCheckMarkWidth = 0;
}
mCheckMarkDrawable = d;
// Do padding resolution. This will call internalSetPadding() and do a requestLayout() if needed.
resolvePadding();
}
/**
* Gets the checkmark drawable
*
* @return The drawable use to represent the checkmark, if any.
*
* @see #setCheckMarkDrawable(Drawable)
* @see #setCheckMarkDrawable(int)
*
* @attr ref android.R.styleable#CheckedTextView_checkMark
*/
public Drawable getCheckMarkDrawable() {
return mCheckMarkDrawable;
}
/**
* @hide
*/
@Override
protected void internalSetPadding(int left, int top, int right, int bottom) {
super.internalSetPadding(left, top, right, bottom);
setBasePadding(isLayoutRtl());
}
@Override
public void onRtlPropertiesChanged(int layoutDirection) {
super.onRtlPropertiesChanged(layoutDirection);
updatePadding();
}
private void updatePadding() {
resetPaddingToInitialValues();
int newPadding = (mCheckMarkDrawable != null) ?
mCheckMarkWidth + mBasePadding : mBasePadding;
if (isLayoutRtl()) {
mNeedRequestlayout |= (mPaddingLeft != newPadding);
mPaddingLeft = newPadding;
} else {
mNeedRequestlayout |= (mPaddingRight != newPadding);
mPaddingRight = newPadding;
}
if (mNeedRequestlayout) {
requestLayout();
mNeedRequestlayout = false;
}
}
private void setBasePadding(boolean isLayoutRtl) {
if (isLayoutRtl) {
mBasePadding = mPaddingLeft;
} else {
mBasePadding = mPaddingRight;
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
final Drawable checkMarkDrawable = mCheckMarkDrawable;
if (checkMarkDrawable != null) {
final int verticalGravity = getGravity() & Gravity.VERTICAL_GRAVITY_MASK;
final int height = checkMarkDrawable.getIntrinsicHeight();
int y = 0;
switch (verticalGravity) {
case Gravity.BOTTOM:
y = getHeight() - height;
break;
case Gravity.CENTER_VERTICAL:
y = (getHeight() - height) / 2;
break;
}
final boolean isLayoutRtl = isLayoutRtl();
final int width = getWidth();
final int top = y;
final int bottom = top + height;
final int left;
final int right;
if (isLayoutRtl) {
left = mBasePadding;
right = left + mCheckMarkWidth;
} else {
right = width - mBasePadding;
left = right - mCheckMarkWidth;
}
checkMarkDrawable.setBounds( left, top, right, bottom);
checkMarkDrawable.draw(canvas);
}
}
@Override
protected int[] onCreateDrawableState(int extraSpace) {
final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
if (isChecked()) {
mergeDrawableStates(drawableState, CHECKED_STATE_SET);
}
return drawableState;
}
@Override
protected void drawableStateChanged() {
super.drawableStateChanged();
if (mCheckMarkDrawable != null) {
int[] myDrawableState = getDrawableState();
// Set the state of the Drawable
mCheckMarkDrawable.setState(myDrawableState);
invalidate();
}
}
@Override
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(event);
event.setClassName(CheckedTextView.class.getName());
event.setChecked(mChecked);
}
@Override
public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
super.onInitializeAccessibilityNodeInfo(info);
info.setClassName(CheckedTextView.class.getName());
info.setCheckable(true);
info.setChecked(mChecked);
}
}