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ColorPickerView.java
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ColorPickerView.java
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package wang.relish.colorpicker;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ComposeShader;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Point;
import android.graphics.PorterDuff;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.Shader.TileMode;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import androidx.annotation.IntDef;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
/**
* 取色器
* <p>
* 所有注释单位为dp的全局变量,初始都是dp值,在使用之前会乘上屏幕像素(mDensity)称为px值
*
* @author Relish Wang
* @since 2017/08/02
*/
public class ColorPickerView extends View {
@IntDef({PANEL.SAT_VAL, PANEL.HUE})
@Retention(RetentionPolicy.SOURCE)
@interface PANEL {
int SAT_VAL = 0;
int HUE = 1;
}
/**
* 显示H、SV的矩形的边框粗细(单位:dp)
*/
private final static float BORDER_WIDTH = 1;
/**
* H矩形的宽度(单位:dp)
*/
private float mHuePanelWidth = 30f;
/**
* H、SV矩形间的间距(单位:dp)
*/
private float mPanelSpacing = 10f;
/**
* 当mode为MeasureSpec.UNSPECIFIED时的首选高度(单位:dp)
*/
private float mPreferredHeight = 200;
/**
* 当mode为MeasureSpec.UNSPECIFIED时的首选宽度(单位:dp)
*/
private float mPreferredWidth = mPreferredHeight + mHuePanelWidth + mPanelSpacing;
/**
* SV指示器的半径(单位:dp)
*/
private float mSVTrackerRadius = 5f;
/**
* SV指示器的半径(单位:dp)
*/
private float mHTrackerHeight = 4f;
/**
* H、SV矩形与父布局的边距(单位:dp)
*/
private float mRectOffset = 2f;
/**
* 屏幕密度
*/
private float mDensity = 1f;
/**
* 绘制SV的画笔
*/
private Paint mSatValPaint;
/**
* 绘制SV指示器的画笔
*/
private Paint mSatValTrackerPaint;
/**
* 绘制H的画笔
*/
private Paint mHuePaint;
/**
* 绘制H指示器的画笔
*/
private Paint mHueTrackerPaint;
/**
* 绘制H、SV矩形的边线的画笔
*/
private Paint mBorderPaint;
//H、V着色器
private Shader mHueShader;
private Shader mValShader;
//HSV的默认值
private float mHue = 360f;
private float mSat = 0f;
private float mVal = 0f;
/**
* 用于显示被选择H的位置的指示器的颜色
*/
private int mSliderTrackerColor = 0xff1c1c1c;
/**
* H、SV矩形的边框颜色
*/
private int mBorderColor = 0xff6E6E6E;
/**
* 记录上一次被点击的颜色板
*/
@PANEL
private int mLastTouchedPanel = PANEL.SAT_VAL;
/**
* 边距
*/
private float mDrawingOffset;
/**
* H指示器
*/
private RectF mDrawingRect;
/**
* 用于选择SV的矩形
*/
private RectF mSatValRect;
/**
* 用于选择H的矩形
*/
private RectF mHueRect;
/**
* SV指示器
*/
private Point mStartTouchPoint = null;
private OnColorChangedListener mListener;
interface OnColorChangedListener {
void onColorChanged(int color);
}
public ColorPickerView(Context context) {
this(context, null);
}
public ColorPickerView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ColorPickerView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
mDensity = getContext().getResources().getDisplayMetrics().density;//获取屏幕密度
mSVTrackerRadius *= mDensity;//灰度饱和度指示器的半径
mHTrackerHeight *= mDensity;//色相指示器高度
mRectOffset *= mDensity;//H、SV矩形与父布局的边距
mHuePanelWidth *= mDensity;//H矩形的宽度
mPanelSpacing *= mDensity;//H、SV矩形间的间距
mPreferredHeight *= mDensity;//当mode为MeasureSpec.UNSPECIFIED时的首选高度
mPreferredWidth *= mDensity;//当mode为MeasureSpec.UNSPECIFIED时的首选宽度
mDrawingOffset = calculateRequiredOffset();//计算所需位移
initPaintTools();//初始化画笔、画布
setFocusable(true);//设置可获取焦点
setFocusableInTouchMode(true);//设置在被触摸时会获取焦点
}
/**
* mSVTrackerRadius、
* mRectOffset、
* BORDER_WIDTH * mDensity
* 三者的最大值
* 的1.5倍
*
* @return 边距
*/
private float calculateRequiredOffset() {
float offset = Math.max(mSVTrackerRadius, mRectOffset);
offset = Math.max(offset, BORDER_WIDTH * mDensity);
return offset * 1.5f;
}
private void initPaintTools() {
mSatValPaint = new Paint();
mSatValTrackerPaint = new Paint();
mHuePaint = new Paint();
mHueTrackerPaint = new Paint();
mBorderPaint = new Paint();
mSatValTrackerPaint.setStyle(Style.STROKE);
mSatValTrackerPaint.setStrokeWidth(2f * mDensity);
mSatValTrackerPaint.setAntiAlias(true);
mHueTrackerPaint.setColor(mSliderTrackerColor);
mHueTrackerPaint.setStyle(Style.STROKE);
mHueTrackerPaint.setStrokeWidth(2f * mDensity);
mHueTrackerPaint.setAntiAlias(true);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int widthAllowed = MeasureSpec.getSize(widthMeasureSpec);
int heightAllowed = MeasureSpec.getSize(heightMeasureSpec);
widthAllowed = isUnspecified(widthMode) ? (int) mPreferredWidth : widthAllowed;
heightAllowed = isUnspecified(heightMode) ? (int) mPreferredHeight : heightAllowed;
int width = widthAllowed;
int height = (int) (widthAllowed - mPanelSpacing - mHuePanelWidth);
//当根据宽度计算出来的高度大于可允许的最大高度时 或 当前是横屏
if (height > heightAllowed || "landscape".equals(getTag())) {
height = heightAllowed;
width = (int) (height + mPanelSpacing + mHuePanelWidth);
}
setMeasuredDimension(width, height);
}
private static boolean isUnspecified(int mode) {
return !(mode == MeasureSpec.EXACTLY || mode == MeasureSpec.AT_MOST);
}
@Override
protected void onDraw(Canvas canvas) {
if (mDrawingRect.width() <= 0 || mDrawingRect.height() <= 0) return;
drawSatValPanel(canvas);//绘制SV选择区域
drawHuePanel(canvas);//绘制右侧H选择区域
}
/**
* 绘制S、V选择区域(矩形)
*
* @param canvas 画布
*/
private void drawSatValPanel(Canvas canvas) {
//描边(先画一个大矩形, 再在内部画一个小矩形,就可以显示出描边的效果)
mBorderPaint.setColor(mBorderColor);
canvas.drawRect(
mDrawingRect.left,
mDrawingRect.top,
mSatValRect.right + BORDER_WIDTH,
mSatValRect.bottom + BORDER_WIDTH,
mBorderPaint);
//组合着色器 = 明度线性着色器 + 饱和度线性着色器
ComposeShader mShader = generateSVShader();
mSatValPaint.setShader(mShader);
canvas.drawRect(mSatValRect, mSatValPaint);
//初始化选择器的位置
Point p = satValToPoint(mSat, mVal);
//绘制显示SV值的选择器
mSatValTrackerPaint.setColor(0xff000000);
canvas.drawCircle(p.x, p.y, mSVTrackerRadius - 1f * mDensity, mSatValTrackerPaint);
//绘制外圆
mSatValTrackerPaint.setColor(0xffdddddd);
canvas.drawCircle(p.x, p.y, mSVTrackerRadius, mSatValTrackerPaint);
}
/**
* 创建SV着色器(明度线性着色器 + 饱和度线性着色器)
*
* @return 着色器
*/
private ComposeShader generateSVShader() {
//明度线性着色器
if (mValShader == null) {
mValShader = new LinearGradient(mSatValRect.left, mSatValRect.top, mSatValRect.left, mSatValRect.bottom,
0xffffffff, 0xff000000, TileMode.CLAMP);
}
//HSV转化为RGB
int rgb = Color.HSVToColor(new float[]{mHue, 1f, 1f});
//饱和线性着色器
Shader satShader = new LinearGradient(mSatValRect.left, mSatValRect.top, mSatValRect.right, mSatValRect.top,
0xffffffff, rgb, TileMode.CLAMP);
//组合着色器 = 明度线性着色器 + 饱和度线性着色器
return new ComposeShader(mValShader, satShader, PorterDuff.Mode.MULTIPLY);
}
/**
* 绘制右侧H选择区域
*
* @param canvas 画布
*/
private void drawHuePanel(Canvas canvas) {
final RectF rect = mHueRect;
mBorderPaint.setColor(mBorderColor);
canvas.drawRect(rect.left - BORDER_WIDTH,
rect.top - BORDER_WIDTH,
rect.right + BORDER_WIDTH,
rect.bottom + BORDER_WIDTH,
mBorderPaint);
//初始化H线性着色器
if (mHueShader == null) {
int[] hue = new int[361];
int count = 0;
for (int i = hue.length - 1; i >= 0; i--, count++) {
hue[count] = Color.HSVToColor(new float[]{i, 1f, 1f});
}
mHueShader = new LinearGradient(
rect.left,
rect.top,
rect.left,
rect.bottom,
hue,
null,
TileMode.CLAMP);
mHuePaint.setShader(mHueShader);
}
canvas.drawRect(rect, mHuePaint);
float halfHTrackerHeight = mHTrackerHeight / 2;
//初始化H选择器选择条位置
Point p = hueToPoint(mHue);
RectF r = new RectF();
r.left = rect.left - mRectOffset;
r.right = rect.right + mRectOffset;
r.top = p.y - halfHTrackerHeight;
r.bottom = p.y + halfHTrackerHeight;
//绘制选择条
canvas.drawRoundRect(r, 2, 2, mHueTrackerPaint);
}
private Point hueToPoint(float hue) {
final RectF rect = mHueRect;
final float height = rect.height();
Point p = new Point();
p.y = (int) (height - (hue * height / 360f) + rect.top);
p.x = (int) rect.left;
return p;
}
private Point satValToPoint(float sat, float val) {
final float height = mSatValRect.height();
final float width = mSatValRect.width();
Point p = new Point();
p.x = (int) (sat * width + mSatValRect.left);
p.y = (int) ((1f - val) * height + mSatValRect.top);
return p;
}
private float[] pointToSatVal(float x, float y) {
final RectF rect = mSatValRect;
float[] result = new float[2];
float width = rect.width();
float height = rect.height();
if (x < rect.left) {
x = 0f;
} else if (x > rect.right) {
x = width;
} else {
x = x - rect.left;
}
if (y < rect.top) {
y = 0f;
} else if (y > rect.bottom) {
y = height;
} else {
y = y - rect.top;
}
result[0] = 1.f / width * x;
result[1] = 1.f - (1.f / height * y);
return result;
}
private float pointToHue(float y) {
final RectF rect = mHueRect;
float height = rect.height();
if (y < rect.top) {
y = 0f;
} else if (y > rect.bottom) {
y = height;
} else {
y = y - rect.top;
}
return 360f - (y * 360f / height);
}
@Override
public boolean onTrackballEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
boolean isUpdated = false;
if (event.getAction() == MotionEvent.ACTION_MOVE) {
switch (mLastTouchedPanel) {
case PANEL.SAT_VAL:
float sat, val;
sat = mSat + x / 50f;
val = mVal - y / 50f;
if (sat < 0f) {
sat = 0f;
} else if (sat > 1f) {
sat = 1f;
}
if (val < 0f) {
val = 0f;
} else if (val > 1f) {
val = 1f;
}
mSat = sat;
mVal = val;
isUpdated = true;
break;
case PANEL.HUE:
float hue = mHue - y * 10f;
if (hue < 0f) {
hue = 0f;
} else if (hue > 360f) {
hue = 360f;
}
mHue = hue;
isUpdated = true;
break;
}
}
if (isUpdated) {
if (mListener != null) {
mListener.onColorChanged(Color.HSVToColor(new float[]{mHue, mSat, mVal}));
}
invalidate();
return true;
}
return super.onTrackballEvent(event);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
boolean isUpdated = false;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mStartTouchPoint = new Point((int) event.getX(), (int) event.getY());
isUpdated = moveTrackersIfNeeded(event);
break;
case MotionEvent.ACTION_MOVE:
isUpdated = moveTrackersIfNeeded(event);
break;
case MotionEvent.ACTION_UP:
mStartTouchPoint = null;
isUpdated = moveTrackersIfNeeded(event);
break;
}
if (isUpdated) {
if (mListener != null) {
mListener.onColorChanged(Color.HSVToColor(new float[]{mHue, mSat, mVal}));
}
invalidate();
return true;
}
return super.onTouchEvent(event);
}
private boolean moveTrackersIfNeeded(MotionEvent event) {
if (mStartTouchPoint == null) return false;
boolean update = false;
int startX = mStartTouchPoint.x;
int startY = mStartTouchPoint.y;
if (mHueRect.contains(startX, startY)) {
mLastTouchedPanel = PANEL.HUE;
mHue = pointToHue(event.getY());
update = true;
} else if (mSatValRect.contains(startX, startY)) {
mLastTouchedPanel = PANEL.SAT_VAL;
float[] result = pointToSatVal(event.getX(), event.getY());
mSat = result[0];
mVal = result[1];
update = true;
}
return update;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mDrawingRect = new RectF();
mDrawingRect.left = mDrawingOffset + getPaddingLeft();
mDrawingRect.right = w - mDrawingOffset - getPaddingRight();
mDrawingRect.top = mDrawingOffset + getPaddingTop();
mDrawingRect.bottom = h - mDrawingOffset - getPaddingBottom();
//当DatePickerView的长宽改变时,重新计算SV、H矩形大小
setUpSatValRect();
setUpHueRect();
}
private void setUpSatValRect() {
final RectF dRect = mDrawingRect;
float panelSide = dRect.height() - BORDER_WIDTH * 2;
float left = dRect.left + BORDER_WIDTH;
float top = dRect.top + BORDER_WIDTH;
float bottom = top + panelSide;
float right = left + panelSide;
mSatValRect = new RectF(left, top, right, bottom);
}
private void setUpHueRect() {
final RectF dRect = mDrawingRect;
float left = dRect.right - mHuePanelWidth + BORDER_WIDTH;
float top = dRect.top + BORDER_WIDTH;
float bottom = dRect.bottom - BORDER_WIDTH;
float right = dRect.right - BORDER_WIDTH;
mHueRect = new RectF(left, top, right, bottom);
}
/**
* 设置颜色改变监听器
*
* @param listener 颜色改变监听器
*/
public void setOnColorChangedListener(OnColorChangedListener listener) {
mListener = listener;
}
/**
* 设置边框颜色
*
* @param color 边框颜色
*/
public void setBorderColor(int color) {
mBorderColor = color;
invalidate();
}
/**
* 获取边框颜色
*
* @return 边框颜色
*/
public int getBorderColor() {
return mBorderColor;
}
/**
* 获取当前颜色
*
* @return 当前颜色
*/
public int getColor() {
return Color.HSVToColor(new float[]{mHue, mSat, mVal});
}
/**
* 设置选择的颜色
*
* @param color 被选择的颜色
*/
public void setColor(int color) {
setColor(color, false);
}
/**
* 设置被选择的颜色
*
* @param color 被选择的颜色
* @param callback 是否触发OnColorChangedListener
*/
public void setColor(int color, boolean callback) {
float[] hsv = new float[3];
Color.colorToHSV(color, hsv);
mHue = hsv[0];
mSat = hsv[1];
mVal = hsv[2];
if (callback && mListener != null) {
mListener.onColorChanged(Color.HSVToColor(new float[]{mHue, mSat, mVal}));
}
invalidate();
}
/**
* ColorPickerView的padding
*
* @return padding(单位:px)
*/
public float getDrawingOffset() {
return mDrawingOffset;
}
public void setSliderTrackerColor(int color) {
mSliderTrackerColor = color;
mHueTrackerPaint.setColor(mSliderTrackerColor);
invalidate();
}
public int getSliderTrackerColor() {
return mSliderTrackerColor;
}
}