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Switch.java
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Switch.java
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/*
* Copyright (C) 2010 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 android.animation.ObjectAnimator;
import android.annotation.DrawableRes;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.StyleRes;
import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Insets;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.Rect;
import android.graphics.Region.Op;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.text.Layout;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.text.TextUtils;
import android.text.method.AllCapsTransformationMethod;
import android.text.method.TransformationMethod2;
import android.util.AttributeSet;
import android.util.FloatProperty;
import android.util.MathUtils;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.SoundEffectConstants;
import android.view.VelocityTracker;
import android.view.ViewConfiguration;
import android.view.ViewStructure;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
import com.android.internal.R;
/**
* A Switch is a two-state toggle switch widget that can select between two
* options. The user may drag the "thumb" back and forth to choose the selected option,
* or simply tap to toggle as if it were a checkbox. The {@link #setText(CharSequence) text}
* property controls the text displayed in the label for the switch, whereas the
* {@link #setTextOff(CharSequence) off} and {@link #setTextOn(CharSequence) on} text
* controls the text on the thumb. Similarly, the
* {@link #setTextAppearance(android.content.Context, int) textAppearance} and the related
* setTypeface() methods control the typeface and style of label text, whereas the
* {@link #setSwitchTextAppearance(android.content.Context, int) switchTextAppearance} and
* the related setSwitchTypeface() methods control that of the thumb.
*
* <p>{@link android.support.v7.widget.SwitchCompat} is a version of
* the Switch widget which runs on devices back to API 7.</p>
*
* <p>See the <a href="{@docRoot}guide/topics/ui/controls/togglebutton.html">Toggle Buttons</a>
* guide.</p>
*
* @attr ref android.R.styleable#Switch_textOn
* @attr ref android.R.styleable#Switch_textOff
* @attr ref android.R.styleable#Switch_switchMinWidth
* @attr ref android.R.styleable#Switch_switchPadding
* @attr ref android.R.styleable#Switch_switchTextAppearance
* @attr ref android.R.styleable#Switch_thumb
* @attr ref android.R.styleable#Switch_thumbTextPadding
* @attr ref android.R.styleable#Switch_track
*/
public class Switch extends CompoundButton {
private static final int THUMB_ANIMATION_DURATION = 250;
private static final int TOUCH_MODE_IDLE = 0;
private static final int TOUCH_MODE_DOWN = 1;
private static final int TOUCH_MODE_DRAGGING = 2;
// Enum for the "typeface" XML parameter.
private static final int SANS = 1;
private static final int SERIF = 2;
private static final int MONOSPACE = 3;
private Drawable mThumbDrawable;
private ColorStateList mThumbTintList = null;
private PorterDuff.Mode mThumbTintMode = null;
private boolean mHasThumbTint = false;
private boolean mHasThumbTintMode = false;
private Drawable mTrackDrawable;
private ColorStateList mTrackTintList = null;
private PorterDuff.Mode mTrackTintMode = null;
private boolean mHasTrackTint = false;
private boolean mHasTrackTintMode = false;
private int mThumbTextPadding;
private int mSwitchMinWidth;
private int mSwitchPadding;
private boolean mSplitTrack;
private CharSequence mTextOn;
private CharSequence mTextOff;
private boolean mShowText;
private int mTouchMode;
private int mTouchSlop;
private float mTouchX;
private float mTouchY;
private VelocityTracker mVelocityTracker = VelocityTracker.obtain();
private int mMinFlingVelocity;
private float mThumbPosition;
/**
* Width required to draw the switch track and thumb. Includes padding and
* optical bounds for both the track and thumb.
*/
private int mSwitchWidth;
/**
* Height required to draw the switch track and thumb. Includes padding and
* optical bounds for both the track and thumb.
*/
private int mSwitchHeight;
/**
* Width of the thumb's content region. Does not include padding or
* optical bounds.
*/
private int mThumbWidth;
/** Left bound for drawing the switch track and thumb. */
private int mSwitchLeft;
/** Top bound for drawing the switch track and thumb. */
private int mSwitchTop;
/** Right bound for drawing the switch track and thumb. */
private int mSwitchRight;
/** Bottom bound for drawing the switch track and thumb. */
private int mSwitchBottom;
private TextPaint mTextPaint;
private ColorStateList mTextColors;
private Layout mOnLayout;
private Layout mOffLayout;
private TransformationMethod2 mSwitchTransformationMethod;
private ObjectAnimator mPositionAnimator;
@SuppressWarnings("hiding")
private final Rect mTempRect = new Rect();
private static final int[] CHECKED_STATE_SET = {
R.attr.state_checked
};
/**
* Construct a new Switch with default styling.
*
* @param context The Context that will determine this widget's theming.
*/
public Switch(Context context) {
this(context, null);
}
/**
* Construct a new Switch with default styling, overriding specific style
* attributes as requested.
*
* @param context The Context that will determine this widget's theming.
* @param attrs Specification of attributes that should deviate from default styling.
*/
public Switch(Context context, AttributeSet attrs) {
this(context, attrs, com.android.internal.R.attr.switchStyle);
}
/**
* Construct a new Switch with a default style determined by the given theme attribute,
* overriding specific style attributes as requested.
*
* @param context The Context that will determine this widget's theming.
* @param attrs Specification of attributes that should deviate from the default styling.
* @param defStyleAttr An attribute in the current theme that contains a
* reference to a style resource that supplies default values for
* the view. Can be 0 to not look for defaults.
*/
public Switch(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
/**
* Construct a new Switch with a default style determined by the given theme
* attribute or style resource, overriding specific style attributes as
* requested.
*
* @param context The Context that will determine this widget's theming.
* @param attrs Specification of attributes that should deviate from the
* default styling.
* @param defStyleAttr An attribute in the current theme that contains a
* reference to a style resource that supplies default values for
* the view. Can be 0 to not look for defaults.
* @param defStyleRes A resource identifier of a style resource that
* supplies default values for the view, used only if
* defStyleAttr is 0 or can not be found in the theme. Can be 0
* to not look for defaults.
*/
public Switch(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
mTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
final Resources res = getResources();
mTextPaint.density = res.getDisplayMetrics().density;
mTextPaint.setCompatibilityScaling(res.getCompatibilityInfo().applicationScale);
final TypedArray a = context.obtainStyledAttributes(
attrs, com.android.internal.R.styleable.Switch, defStyleAttr, defStyleRes);
mThumbDrawable = a.getDrawable(com.android.internal.R.styleable.Switch_thumb);
if (mThumbDrawable != null) {
mThumbDrawable.setCallback(this);
}
mTrackDrawable = a.getDrawable(com.android.internal.R.styleable.Switch_track);
if (mTrackDrawable != null) {
mTrackDrawable.setCallback(this);
}
mTextOn = a.getText(com.android.internal.R.styleable.Switch_textOn);
mTextOff = a.getText(com.android.internal.R.styleable.Switch_textOff);
mShowText = a.getBoolean(com.android.internal.R.styleable.Switch_showText, true);
mThumbTextPadding = a.getDimensionPixelSize(
com.android.internal.R.styleable.Switch_thumbTextPadding, 0);
mSwitchMinWidth = a.getDimensionPixelSize(
com.android.internal.R.styleable.Switch_switchMinWidth, 0);
mSwitchPadding = a.getDimensionPixelSize(
com.android.internal.R.styleable.Switch_switchPadding, 0);
mSplitTrack = a.getBoolean(com.android.internal.R.styleable.Switch_splitTrack, false);
ColorStateList thumbTintList = a.getColorStateList(
com.android.internal.R.styleable.Switch_thumbTint);
if (thumbTintList != null) {
mThumbTintList = thumbTintList;
mHasThumbTint = true;
}
PorterDuff.Mode thumbTintMode = Drawable.parseTintMode(
a.getInt(com.android.internal.R.styleable.Switch_thumbTintMode, -1), null);
if (mThumbTintMode != thumbTintMode) {
mThumbTintMode = thumbTintMode;
mHasThumbTintMode = true;
}
if (mHasThumbTint || mHasThumbTintMode) {
applyThumbTint();
}
ColorStateList trackTintList = a.getColorStateList(
com.android.internal.R.styleable.Switch_trackTint);
if (trackTintList != null) {
mTrackTintList = trackTintList;
mHasTrackTint = true;
}
PorterDuff.Mode trackTintMode = Drawable.parseTintMode(
a.getInt(com.android.internal.R.styleable.Switch_trackTintMode, -1), null);
if (mTrackTintMode != trackTintMode) {
mTrackTintMode = trackTintMode;
mHasTrackTintMode = true;
}
if (mHasTrackTint || mHasTrackTintMode) {
applyTrackTint();
}
final int appearance = a.getResourceId(
com.android.internal.R.styleable.Switch_switchTextAppearance, 0);
if (appearance != 0) {
setSwitchTextAppearance(context, appearance);
}
a.recycle();
final ViewConfiguration config = ViewConfiguration.get(context);
mTouchSlop = config.getScaledTouchSlop();
mMinFlingVelocity = config.getScaledMinimumFlingVelocity();
// Refresh display with current params
refreshDrawableState();
setChecked(isChecked());
}
/**
* Sets the switch text color, size, style, hint color, and highlight color
* from the specified TextAppearance resource.
*
* @attr ref android.R.styleable#Switch_switchTextAppearance
*/
public void setSwitchTextAppearance(Context context, @StyleRes int resid) {
TypedArray appearance =
context.obtainStyledAttributes(resid,
com.android.internal.R.styleable.TextAppearance);
ColorStateList colors;
int ts;
colors = appearance.getColorStateList(com.android.internal.R.styleable.
TextAppearance_textColor);
if (colors != null) {
mTextColors = colors;
} else {
// If no color set in TextAppearance, default to the view's textColor
mTextColors = getTextColors();
}
ts = appearance.getDimensionPixelSize(com.android.internal.R.styleable.
TextAppearance_textSize, 0);
if (ts != 0) {
if (ts != mTextPaint.getTextSize()) {
mTextPaint.setTextSize(ts);
requestLayout();
}
}
int typefaceIndex, styleIndex;
typefaceIndex = appearance.getInt(com.android.internal.R.styleable.
TextAppearance_typeface, -1);
styleIndex = appearance.getInt(com.android.internal.R.styleable.
TextAppearance_textStyle, -1);
setSwitchTypefaceByIndex(typefaceIndex, styleIndex);
boolean allCaps = appearance.getBoolean(com.android.internal.R.styleable.
TextAppearance_textAllCaps, false);
if (allCaps) {
mSwitchTransformationMethod = new AllCapsTransformationMethod(getContext());
mSwitchTransformationMethod.setLengthChangesAllowed(true);
} else {
mSwitchTransformationMethod = null;
}
appearance.recycle();
}
private void setSwitchTypefaceByIndex(int typefaceIndex, int styleIndex) {
Typeface tf = null;
switch (typefaceIndex) {
case SANS:
tf = Typeface.SANS_SERIF;
break;
case SERIF:
tf = Typeface.SERIF;
break;
case MONOSPACE:
tf = Typeface.MONOSPACE;
break;
}
setSwitchTypeface(tf, styleIndex);
}
/**
* Sets the typeface and style in which the text should be displayed on the
* switch, and turns on the fake bold and italic bits in the Paint if the
* Typeface that you provided does not have all the bits in the
* style that you specified.
*/
public void setSwitchTypeface(Typeface tf, int style) {
if (style > 0) {
if (tf == null) {
tf = Typeface.defaultFromStyle(style);
} else {
tf = Typeface.create(tf, style);
}
setSwitchTypeface(tf);
// now compute what (if any) algorithmic styling is needed
int typefaceStyle = tf != null ? tf.getStyle() : 0;
int need = style & ~typefaceStyle;
mTextPaint.setFakeBoldText((need & Typeface.BOLD) != 0);
mTextPaint.setTextSkewX((need & Typeface.ITALIC) != 0 ? -0.25f : 0);
} else {
mTextPaint.setFakeBoldText(false);
mTextPaint.setTextSkewX(0);
setSwitchTypeface(tf);
}
}
/**
* Sets the typeface in which the text should be displayed on the switch.
* Note that not all Typeface families actually have bold and italic
* variants, so you may need to use
* {@link #setSwitchTypeface(Typeface, int)} to get the appearance
* that you actually want.
*
* @attr ref android.R.styleable#TextView_typeface
* @attr ref android.R.styleable#TextView_textStyle
*/
public void setSwitchTypeface(Typeface tf) {
if (mTextPaint.getTypeface() != tf) {
mTextPaint.setTypeface(tf);
requestLayout();
invalidate();
}
}
/**
* Set the amount of horizontal padding between the switch and the associated text.
*
* @param pixels Amount of padding in pixels
*
* @attr ref android.R.styleable#Switch_switchPadding
*/
public void setSwitchPadding(int pixels) {
mSwitchPadding = pixels;
requestLayout();
}
/**
* Get the amount of horizontal padding between the switch and the associated text.
*
* @return Amount of padding in pixels
*
* @attr ref android.R.styleable#Switch_switchPadding
*/
public int getSwitchPadding() {
return mSwitchPadding;
}
/**
* Set the minimum width of the switch in pixels. The switch's width will be the maximum
* of this value and its measured width as determined by the switch drawables and text used.
*
* @param pixels Minimum width of the switch in pixels
*
* @attr ref android.R.styleable#Switch_switchMinWidth
*/
public void setSwitchMinWidth(int pixels) {
mSwitchMinWidth = pixels;
requestLayout();
}
/**
* Get the minimum width of the switch in pixels. The switch's width will be the maximum
* of this value and its measured width as determined by the switch drawables and text used.
*
* @return Minimum width of the switch in pixels
*
* @attr ref android.R.styleable#Switch_switchMinWidth
*/
public int getSwitchMinWidth() {
return mSwitchMinWidth;
}
/**
* Set the horizontal padding around the text drawn on the switch itself.
*
* @param pixels Horizontal padding for switch thumb text in pixels
*
* @attr ref android.R.styleable#Switch_thumbTextPadding
*/
public void setThumbTextPadding(int pixels) {
mThumbTextPadding = pixels;
requestLayout();
}
/**
* Get the horizontal padding around the text drawn on the switch itself.
*
* @return Horizontal padding for switch thumb text in pixels
*
* @attr ref android.R.styleable#Switch_thumbTextPadding
*/
public int getThumbTextPadding() {
return mThumbTextPadding;
}
/**
* Set the drawable used for the track that the switch slides within.
*
* @param track Track drawable
*
* @attr ref android.R.styleable#Switch_track
*/
public void setTrackDrawable(Drawable track) {
if (mTrackDrawable != null) {
mTrackDrawable.setCallback(null);
}
mTrackDrawable = track;
if (track != null) {
track.setCallback(this);
}
requestLayout();
}
/**
* Set the drawable used for the track that the switch slides within.
*
* @param resId Resource ID of a track drawable
*
* @attr ref android.R.styleable#Switch_track
*/
public void setTrackResource(@DrawableRes int resId) {
setTrackDrawable(getContext().getDrawable(resId));
}
/**
* Get the drawable used for the track that the switch slides within.
*
* @return Track drawable
*
* @attr ref android.R.styleable#Switch_track
*/
public Drawable getTrackDrawable() {
return mTrackDrawable;
}
/**
* Applies a tint to the track drawable. Does not modify the current
* tint mode, which is {@link PorterDuff.Mode#SRC_IN} by default.
* <p>
* Subsequent calls to {@link #setTrackDrawable(Drawable)} will
* automatically mutate the drawable and apply the specified tint and tint
* mode using {@link Drawable#setTintList(ColorStateList)}.
*
* @param tint the tint to apply, may be {@code null} to clear tint
*
* @attr ref android.R.styleable#Switch_trackTint
* @see #getTrackTintList()
* @see Drawable#setTintList(ColorStateList)
*/
public void setTrackTintList(@Nullable ColorStateList tint) {
mTrackTintList = tint;
mHasTrackTint = true;
applyTrackTint();
}
/**
* @return the tint applied to the track drawable
* @attr ref android.R.styleable#Switch_trackTint
* @see #setTrackTintList(ColorStateList)
*/
@Nullable
public ColorStateList getTrackTintList() {
return mTrackTintList;
}
/**
* Specifies the blending mode used to apply the tint specified by
* {@link #setTrackTintList(ColorStateList)}} to the track drawable.
* The default mode is {@link PorterDuff.Mode#SRC_IN}.
*
* @param tintMode the blending mode used to apply the tint, may be
* {@code null} to clear tint
* @attr ref android.R.styleable#Switch_trackTintMode
* @see #getTrackTintMode()
* @see Drawable#setTintMode(PorterDuff.Mode)
*/
public void setTrackTintMode(@Nullable PorterDuff.Mode tintMode) {
mTrackTintMode = tintMode;
mHasTrackTintMode = true;
applyTrackTint();
}
/**
* @return the blending mode used to apply the tint to the track
* drawable
* @attr ref android.R.styleable#Switch_trackTintMode
* @see #setTrackTintMode(PorterDuff.Mode)
*/
@Nullable
public PorterDuff.Mode getTrackTintMode() {
return mTrackTintMode;
}
private void applyTrackTint() {
if (mTrackDrawable != null && (mHasTrackTint || mHasTrackTintMode)) {
mTrackDrawable = mTrackDrawable.mutate();
if (mHasTrackTint) {
mTrackDrawable.setTintList(mTrackTintList);
}
if (mHasTrackTintMode) {
mTrackDrawable.setTintMode(mTrackTintMode);
}
// The drawable (or one of its children) may not have been
// stateful before applying the tint, so let's try again.
if (mTrackDrawable.isStateful()) {
mTrackDrawable.setState(getDrawableState());
}
}
}
/**
* Set the drawable used for the switch "thumb" - the piece that the user
* can physically touch and drag along the track.
*
* @param thumb Thumb drawable
*
* @attr ref android.R.styleable#Switch_thumb
*/
public void setThumbDrawable(Drawable thumb) {
if (mThumbDrawable != null) {
mThumbDrawable.setCallback(null);
}
mThumbDrawable = thumb;
if (thumb != null) {
thumb.setCallback(this);
}
requestLayout();
}
/**
* Set the drawable used for the switch "thumb" - the piece that the user
* can physically touch and drag along the track.
*
* @param resId Resource ID of a thumb drawable
*
* @attr ref android.R.styleable#Switch_thumb
*/
public void setThumbResource(@DrawableRes int resId) {
setThumbDrawable(getContext().getDrawable(resId));
}
/**
* Get the drawable used for the switch "thumb" - the piece that the user
* can physically touch and drag along the track.
*
* @return Thumb drawable
*
* @attr ref android.R.styleable#Switch_thumb
*/
public Drawable getThumbDrawable() {
return mThumbDrawable;
}
/**
* Applies a tint to the thumb drawable. Does not modify the current
* tint mode, which is {@link PorterDuff.Mode#SRC_IN} by default.
* <p>
* Subsequent calls to {@link #setThumbDrawable(Drawable)} will
* automatically mutate the drawable and apply the specified tint and tint
* mode using {@link Drawable#setTintList(ColorStateList)}.
*
* @param tint the tint to apply, may be {@code null} to clear tint
*
* @attr ref android.R.styleable#Switch_thumbTint
* @see #getThumbTintList()
* @see Drawable#setTintList(ColorStateList)
*/
public void setThumbTintList(@Nullable ColorStateList tint) {
mThumbTintList = tint;
mHasThumbTint = true;
applyThumbTint();
}
/**
* @return the tint applied to the thumb drawable
* @attr ref android.R.styleable#Switch_thumbTint
* @see #setThumbTintList(ColorStateList)
*/
@Nullable
public ColorStateList getThumbTintList() {
return mThumbTintList;
}
/**
* Specifies the blending mode used to apply the tint specified by
* {@link #setThumbTintList(ColorStateList)}} to the thumb drawable.
* The default mode is {@link PorterDuff.Mode#SRC_IN}.
*
* @param tintMode the blending mode used to apply the tint, may be
* {@code null} to clear tint
* @attr ref android.R.styleable#Switch_thumbTintMode
* @see #getThumbTintMode()
* @see Drawable#setTintMode(PorterDuff.Mode)
*/
public void setThumbTintMode(@Nullable PorterDuff.Mode tintMode) {
mThumbTintMode = tintMode;
mHasThumbTintMode = true;
applyThumbTint();
}
/**
* @return the blending mode used to apply the tint to the thumb
* drawable
* @attr ref android.R.styleable#Switch_thumbTintMode
* @see #setThumbTintMode(PorterDuff.Mode)
*/
@Nullable
public PorterDuff.Mode getThumbTintMode() {
return mThumbTintMode;
}
private void applyThumbTint() {
if (mThumbDrawable != null && (mHasThumbTint || mHasThumbTintMode)) {
mThumbDrawable = mThumbDrawable.mutate();
if (mHasThumbTint) {
mThumbDrawable.setTintList(mThumbTintList);
}
if (mHasThumbTintMode) {
mThumbDrawable.setTintMode(mThumbTintMode);
}
// The drawable (or one of its children) may not have been
// stateful before applying the tint, so let's try again.
if (mThumbDrawable.isStateful()) {
mThumbDrawable.setState(getDrawableState());
}
}
}
/**
* Specifies whether the track should be split by the thumb. When true,
* the thumb's optical bounds will be clipped out of the track drawable,
* then the thumb will be drawn into the resulting gap.
*
* @param splitTrack Whether the track should be split by the thumb
*
* @attr ref android.R.styleable#Switch_splitTrack
*/
public void setSplitTrack(boolean splitTrack) {
mSplitTrack = splitTrack;
invalidate();
}
/**
* Returns whether the track should be split by the thumb.
*
* @attr ref android.R.styleable#Switch_splitTrack
*/
public boolean getSplitTrack() {
return mSplitTrack;
}
/**
* Returns the text displayed when the button is in the checked state.
*
* @attr ref android.R.styleable#Switch_textOn
*/
public CharSequence getTextOn() {
return mTextOn;
}
/**
* Sets the text displayed when the button is in the checked state.
*
* @attr ref android.R.styleable#Switch_textOn
*/
public void setTextOn(CharSequence textOn) {
mTextOn = textOn;
requestLayout();
}
/**
* Returns the text displayed when the button is not in the checked state.
*
* @attr ref android.R.styleable#Switch_textOff
*/
public CharSequence getTextOff() {
return mTextOff;
}
/**
* Sets the text displayed when the button is not in the checked state.
*
* @attr ref android.R.styleable#Switch_textOff
*/
public void setTextOff(CharSequence textOff) {
mTextOff = textOff;
requestLayout();
}
/**
* Sets whether the on/off text should be displayed.
*
* @param showText {@code true} to display on/off text
* @attr ref android.R.styleable#Switch_showText
*/
public void setShowText(boolean showText) {
if (mShowText != showText) {
mShowText = showText;
requestLayout();
}
}
/**
* @return whether the on/off text should be displayed
* @attr ref android.R.styleable#Switch_showText
*/
public boolean getShowText() {
return mShowText;
}
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mShowText) {
if (mOnLayout == null) {
mOnLayout = makeLayout(mTextOn);
}
if (mOffLayout == null) {
mOffLayout = makeLayout(mTextOff);
}
}
final Rect padding = mTempRect;
final int thumbWidth;
final int thumbHeight;
if (mThumbDrawable != null) {
// Cached thumb width does not include padding.
mThumbDrawable.getPadding(padding);
thumbWidth = mThumbDrawable.getIntrinsicWidth() - padding.left - padding.right;
thumbHeight = mThumbDrawable.getIntrinsicHeight();
} else {
thumbWidth = 0;
thumbHeight = 0;
}
final int maxTextWidth;
if (mShowText) {
maxTextWidth = Math.max(mOnLayout.getWidth(), mOffLayout.getWidth())
+ mThumbTextPadding * 2;
} else {
maxTextWidth = 0;
}
mThumbWidth = Math.max(maxTextWidth, thumbWidth);
final int trackHeight;
if (mTrackDrawable != null) {
mTrackDrawable.getPadding(padding);
trackHeight = mTrackDrawable.getIntrinsicHeight();
} else {
padding.setEmpty();
trackHeight = 0;
}
// Adjust left and right padding to ensure there's enough room for the
// thumb's padding (when present).
int paddingLeft = padding.left;
int paddingRight = padding.right;
if (mThumbDrawable != null) {
final Insets inset = mThumbDrawable.getOpticalInsets();
paddingLeft = Math.max(paddingLeft, inset.left);
paddingRight = Math.max(paddingRight, inset.right);
}
final int switchWidth = Math.max(mSwitchMinWidth,
2 * mThumbWidth + paddingLeft + paddingRight);
final int switchHeight = Math.max(trackHeight, thumbHeight);
mSwitchWidth = switchWidth;
mSwitchHeight = switchHeight;
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
final int measuredHeight = getMeasuredHeight();
if (measuredHeight < switchHeight) {
setMeasuredDimension(getMeasuredWidthAndState(), switchHeight);
}
}
/** @hide */
@Override
public void onPopulateAccessibilityEventInternal(AccessibilityEvent event) {
super.onPopulateAccessibilityEventInternal(event);
final CharSequence text = isChecked() ? mTextOn : mTextOff;
if (text != null) {
event.getText().add(text);
}
}
private Layout makeLayout(CharSequence text) {
final CharSequence transformed = (mSwitchTransformationMethod != null)
? mSwitchTransformationMethod.getTransformation(text, this)
: text;
int width = (int) Math.ceil(Layout.getDesiredWidth(transformed, 0,
transformed.length(), mTextPaint, getTextDirectionHeuristic()));
return new StaticLayout(transformed, mTextPaint, width,
Layout.Alignment.ALIGN_NORMAL, 1.f, 0, true);
}
/**
* @return true if (x, y) is within the target area of the switch thumb
*/
private boolean hitThumb(float x, float y) {
if (mThumbDrawable == null) {
return false;
}
// Relies on mTempRect, MUST be called first!
final int thumbOffset = getThumbOffset();
mThumbDrawable.getPadding(mTempRect);
final int thumbTop = mSwitchTop - mTouchSlop;
final int thumbLeft = mSwitchLeft + thumbOffset - mTouchSlop;
final int thumbRight = thumbLeft + mThumbWidth +
mTempRect.left + mTempRect.right + mTouchSlop;
final int thumbBottom = mSwitchBottom + mTouchSlop;
return x > thumbLeft && x < thumbRight && y > thumbTop && y < thumbBottom;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
mVelocityTracker.addMovement(ev);
final int action = ev.getActionMasked();
switch (action) {
case MotionEvent.ACTION_DOWN: {
final float x = ev.getX();
final float y = ev.getY();
if (isEnabled() && hitThumb(x, y)) {
mTouchMode = TOUCH_MODE_DOWN;
mTouchX = x;
mTouchY = y;
}
break;
}
case MotionEvent.ACTION_MOVE: {
switch (mTouchMode) {
case TOUCH_MODE_IDLE:
// Didn't target the thumb, treat normally.
break;
case TOUCH_MODE_DOWN: {
final float x = ev.getX();
final float y = ev.getY();
if (Math.abs(x - mTouchX) > mTouchSlop ||
Math.abs(y - mTouchY) > mTouchSlop) {
mTouchMode = TOUCH_MODE_DRAGGING;
getParent().requestDisallowInterceptTouchEvent(true);
mTouchX = x;
mTouchY = y;
return true;
}
break;
}
case TOUCH_MODE_DRAGGING: {
final float x = ev.getX();
final int thumbScrollRange = getThumbScrollRange();
final float thumbScrollOffset = x - mTouchX;
float dPos;
if (thumbScrollRange != 0) {
dPos = thumbScrollOffset / thumbScrollRange;
} else {
// If the thumb scroll range is empty, just use the
// movement direction to snap on or off.
dPos = thumbScrollOffset > 0 ? 1 : -1;
}
if (isLayoutRtl()) {
dPos = -dPos;
}
final float newPos = MathUtils.constrain(mThumbPosition + dPos, 0, 1);
if (newPos != mThumbPosition) {
mTouchX = x;
setThumbPosition(newPos);
}
return true;
}
}
break;
}
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL: {
if (mTouchMode == TOUCH_MODE_DRAGGING) {
stopDrag(ev);
// Allow super class to handle pressed state, etc.
super.onTouchEvent(ev);
return true;
}
mTouchMode = TOUCH_MODE_IDLE;
mVelocityTracker.clear();
break;
}
}
return super.onTouchEvent(ev);
}
private void cancelSuperTouch(MotionEvent ev) {