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package cn.zhaiyifan.lyrichere.prefs.colorpicker; // w ww . j a va2 s.c o m /** * Created by yifan on 6/8/14. */ 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.Align; 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; /** * Displays a color picker to the user and allow them * to select a color. A slider for the alpha channel is * also available. Enable it by setting * setAlphaSliderVisible(boolean) to true. * * @author Daniel Nilsson */ public class ColorPickerView extends View { private final static int PANEL_SAT_VAL = 0; /* * To remember which panel that has the "focus" when * processing hardware button data. */ private int mLastTouchedPanel = PANEL_SAT_VAL; private final static int PANEL_HUE = 1; private final static int PANEL_ALPHA = 2; /** * The width in pixels of the border * surrounding all color panels. */ private final static float BORDER_WIDTH_PX = 1; /** * The width in dp of the hue panel. */ private float HUE_PANEL_WIDTH = 30f; /** * The height in dp of the alpha panel */ private float ALPHA_PANEL_HEIGHT = 20f; /** * The distance in dp between the different * color panels. */ private float PANEL_SPACING = 10f; /** * The radius in dp of the color palette tracker circle. */ private float PALETTE_CIRCLE_TRACKER_RADIUS = 5f; /** * The dp which the tracker of the hue or alpha panel * will extend outside of its bounds. */ private float RECTANGLE_TRACKER_OFFSET = 2f; private float mDensity = 1f; private OnColorChangedListener mListener; private Paint mSatValPaint; private Paint mSatValTrackerPaint; private Paint mHuePaint; private Paint mHueTrackerPaint; private Paint mAlphaPaint; private Paint mAlphaTextPaint; private Paint mBorderPaint; private Shader mValShader; private Shader mSatShader; private Shader mHueShader; private Shader mAlphaShader; private int mAlpha = 0xff; private float mHue = 360f; private float mSat = 0f; private float mVal = 0f; private String mAlphaSliderText = ""; private int mSliderTrackerColor = 0xff1c1c1c; private int mBorderColor = 0xff6E6E6E; private boolean mShowAlphaPanel = false; /** * Offset from the edge we must have or else * the finger tracker will get clipped when * it is drawn outside of the view. */ private float mDrawingOffset; /* * Distance form the edges of the view * of where we are allowed to draw. */ private RectF mDrawingRect; private RectF mSatValRect; private RectF mHueRect; private RectF mAlphaRect; private AlphaPatternDrawable mAlphaPattern; private Point mStartTouchPoint = null; 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; PALETTE_CIRCLE_TRACKER_RADIUS *= mDensity; RECTANGLE_TRACKER_OFFSET *= mDensity; HUE_PANEL_WIDTH *= mDensity; ALPHA_PANEL_HEIGHT *= mDensity; PANEL_SPACING = PANEL_SPACING * mDensity; mDrawingOffset = calculateRequiredOffset(); initPaintTools(); //Needed for receiving trackball motion events. setFocusable(true); setFocusableInTouchMode(true); } private void initPaintTools() { mSatValPaint = new Paint(); mSatValTrackerPaint = new Paint(); mHuePaint = new Paint(); mHueTrackerPaint = new Paint(); mAlphaPaint = new Paint(); mAlphaTextPaint = 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); mAlphaTextPaint.setColor(0xff1c1c1c); mAlphaTextPaint.setTextSize(14f * mDensity); mAlphaTextPaint.setAntiAlias(true); mAlphaTextPaint.setTextAlign(Align.CENTER); mAlphaTextPaint.setFakeBoldText(true); } private float calculateRequiredOffset() { float offset = Math.max(PALETTE_CIRCLE_TRACKER_RADIUS, RECTANGLE_TRACKER_OFFSET); offset = Math.max(offset, BORDER_WIDTH_PX * mDensity); return offset * 1.5f; } private int[] buildHueColorArray() { 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}); } return hue; } @Override protected void onDraw(Canvas canvas) { if (mDrawingRect.width() <= 0 || mDrawingRect.height() <= 0) return; drawSatValPanel(canvas); drawHuePanel(canvas); drawAlphaPanel(canvas); } private void drawSatValPanel(Canvas canvas) { final RectF rect = mSatValRect; if (BORDER_WIDTH_PX > 0) { mBorderPaint.setColor(mBorderColor); canvas.drawRect(mDrawingRect.left, mDrawingRect.top, rect.right + BORDER_WIDTH_PX, rect.bottom + BORDER_WIDTH_PX, mBorderPaint); } if (mValShader == null) { mValShader = new LinearGradient(rect.left, rect.top, rect.left, rect.bottom, 0xffffffff, 0xff000000, TileMode.CLAMP); } int rgb = Color.HSVToColor(new float[]{mHue, 1f, 1f}); mSatShader = new LinearGradient(rect.left, rect.top, rect.right, rect.top, 0xffffffff, rgb, TileMode.CLAMP); ComposeShader mShader = new ComposeShader(mValShader, mSatShader, PorterDuff.Mode.MULTIPLY); mSatValPaint.setShader(mShader); canvas.drawRect(rect, mSatValPaint); Point p = satValToPoint(mSat, mVal); mSatValTrackerPaint.setColor(0xff000000); canvas.drawCircle(p.x, p.y, PALETTE_CIRCLE_TRACKER_RADIUS - 1f * mDensity, mSatValTrackerPaint); mSatValTrackerPaint.setColor(0xffdddddd); canvas.drawCircle(p.x, p.y, PALETTE_CIRCLE_TRACKER_RADIUS, mSatValTrackerPaint); } private void drawHuePanel(Canvas canvas) { final RectF rect = mHueRect; if (BORDER_WIDTH_PX > 0) { mBorderPaint.setColor(mBorderColor); canvas.drawRect(rect.left - BORDER_WIDTH_PX, rect.top - BORDER_WIDTH_PX, rect.right + BORDER_WIDTH_PX, rect.bottom + BORDER_WIDTH_PX, mBorderPaint); } if (mHueShader == null) { mHueShader = new LinearGradient(rect.left, rect.top, rect.left, rect.bottom, buildHueColorArray(), null, TileMode.CLAMP); mHuePaint.setShader(mHueShader); } canvas.drawRect(rect, mHuePaint); float rectHeight = 4 * mDensity / 2; Point p = hueToPoint(mHue); RectF r = new RectF(); r.left = rect.left - RECTANGLE_TRACKER_OFFSET; r.right = rect.right + RECTANGLE_TRACKER_OFFSET; r.top = p.y - rectHeight; r.bottom = p.y + rectHeight; canvas.drawRoundRect(r, 2, 2, mHueTrackerPaint); } private void drawAlphaPanel(Canvas canvas) { if (!mShowAlphaPanel || mAlphaRect == null || mAlphaPattern == null) return; final RectF rect = mAlphaRect; if (BORDER_WIDTH_PX > 0) { mBorderPaint.setColor(mBorderColor); canvas.drawRect(rect.left - BORDER_WIDTH_PX, rect.top - BORDER_WIDTH_PX, rect.right + BORDER_WIDTH_PX, rect.bottom + BORDER_WIDTH_PX, mBorderPaint); } mAlphaPattern.draw(canvas); float[] hsv = new float[]{mHue, mSat, mVal}; int color = Color.HSVToColor(hsv); int acolor = Color.HSVToColor(0, hsv); mAlphaShader = new LinearGradient(rect.left, rect.top, rect.right, rect.top, color, acolor, TileMode.CLAMP); mAlphaPaint.setShader(mAlphaShader); canvas.drawRect(rect, mAlphaPaint); if (mAlphaSliderText != null && mAlphaSliderText != "") { canvas.drawText(mAlphaSliderText, rect.centerX(), rect.centerY() + 4 * mDensity, mAlphaTextPaint); } float rectWidth = 4 * mDensity / 2; Point p = alphaToPoint(mAlpha); RectF r = new RectF(); r.left = p.x - rectWidth; r.right = p.x + rectWidth; r.top = rect.top - RECTANGLE_TRACKER_OFFSET; r.bottom = rect.bottom + RECTANGLE_TRACKER_OFFSET; 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 RectF rect = mSatValRect; final float height = rect.height(); final float width = rect.width(); Point p = new Point(); p.x = (int) (sat * width + rect.left); p.y = (int) ((1f - val) * height + rect.top); return p; } private Point alphaToPoint(int alpha) { final RectF rect = mAlphaRect; final float width = rect.width(); Point p = new Point(); p.x = (int) (width - (alpha * width / 0xff) + rect.left); p.y = (int) rect.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); } private int pointToAlpha(int x) { final RectF rect = mAlphaRect; final int width = (int) rect.width(); if (x < rect.left) { x = 0; } else if (x > rect.right) { x = width; } else { x = x - (int) rect.left; } return 0xff - (x * 0xff / width); } @Override public boolean onTrackballEvent(MotionEvent event) { float x = event.getX(); float y = event.getY(); boolean update = 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; update = true; break; case PANEL_HUE: float hue = mHue - y * 10f; if (hue < 0f) { hue = 0f; } else if (hue > 360f) { hue = 360f; } mHue = hue; update = true; break; case PANEL_ALPHA: if (!mShowAlphaPanel || mAlphaRect == null) { update = false; } else { int alpha = (int) (mAlpha - x * 10); if (alpha < 0) { alpha = 0; } else if (alpha > 0xff) { alpha = 0xff; } mAlpha = alpha; update = true; } break; } } if (update) { if (mListener != null) { mListener.onColorChanged(Color.HSVToColor(mAlpha, new float[]{mHue, mSat, mVal})); } invalidate(); return true; } return super.onTrackballEvent(event); } @Override public boolean onTouchEvent(MotionEvent event) { boolean update = false; switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mStartTouchPoint = new Point((int) event.getX(), (int) event.getY()); update = moveTrackersIfNeeded(event); break; case MotionEvent.ACTION_MOVE: update = moveTrackersIfNeeded(event); break; case MotionEvent.ACTION_UP: mStartTouchPoint = null; update = moveTrackersIfNeeded(event); break; } if (update) { if (mListener != null) { mListener.onColorChanged(Color.HSVToColor(mAlpha, 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; } else if (mAlphaRect != null && mAlphaRect.contains(startX, startY)) { mLastTouchedPanel = PANEL_ALPHA; mAlpha = pointToAlpha((int) event.getX()); update = true; } return update; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int width = 0; int height = 0; int widthMode = MeasureSpec.getMode(widthMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int widthAllowed = MeasureSpec.getSize(widthMeasureSpec); int heightAllowed = MeasureSpec.getSize(heightMeasureSpec); widthAllowed = chooseWidth(widthMode, widthAllowed); heightAllowed = chooseHeight(heightMode, heightAllowed); if (!mShowAlphaPanel) { height = (int) (widthAllowed - PANEL_SPACING - HUE_PANEL_WIDTH); //If calculated height (based on the width) is more than the allowed height. if (height > heightAllowed || getTag().equals("landscape")) { height = heightAllowed; width = (int) (height + PANEL_SPACING + HUE_PANEL_WIDTH); } else { width = widthAllowed; } } else { width = (int) (heightAllowed - ALPHA_PANEL_HEIGHT + HUE_PANEL_WIDTH); if (width > widthAllowed) { width = widthAllowed; height = (int) (widthAllowed - HUE_PANEL_WIDTH + ALPHA_PANEL_HEIGHT); } else { height = heightAllowed; } } setMeasuredDimension(width, height); } private int chooseWidth(int mode, int size) { if (mode == MeasureSpec.AT_MOST || mode == MeasureSpec.EXACTLY) { return size; } else { // (mode == MeasureSpec.UNSPECIFIED) return getPrefferedWidth(); } } private int chooseHeight(int mode, int size) { if (mode == MeasureSpec.AT_MOST || mode == MeasureSpec.EXACTLY) { return size; } else { // (mode == MeasureSpec.UNSPECIFIED) return getPrefferedHeight(); } } private int getPrefferedWidth() { int width = getPrefferedHeight(); if (mShowAlphaPanel) { width -= (PANEL_SPACING + ALPHA_PANEL_HEIGHT); } return (int) (width + HUE_PANEL_WIDTH + PANEL_SPACING); } private int getPrefferedHeight() { int height = (int) (200 * mDensity); if (mShowAlphaPanel) { height += PANEL_SPACING + ALPHA_PANEL_HEIGHT; } return height; } @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(); setUpSatValRect(); setUpHueRect(); setUpAlphaRect(); } private void setUpSatValRect() { final RectF dRect = mDrawingRect; float panelSide = dRect.height() - BORDER_WIDTH_PX * 2; if (mShowAlphaPanel) { panelSide -= PANEL_SPACING + ALPHA_PANEL_HEIGHT; } float left = dRect.left + BORDER_WIDTH_PX; float top = dRect.top + BORDER_WIDTH_PX; 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 - HUE_PANEL_WIDTH + BORDER_WIDTH_PX; float top = dRect.top + BORDER_WIDTH_PX; float bottom = dRect.bottom - BORDER_WIDTH_PX - (mShowAlphaPanel ? (PANEL_SPACING + ALPHA_PANEL_HEIGHT) : 0); float right = dRect.right - BORDER_WIDTH_PX; mHueRect = new RectF(left, top, right, bottom); } private void setUpAlphaRect() { if (!mShowAlphaPanel) return; final RectF dRect = mDrawingRect; float left = dRect.left + BORDER_WIDTH_PX; float top = dRect.bottom - ALPHA_PANEL_HEIGHT + BORDER_WIDTH_PX; float bottom = dRect.bottom - BORDER_WIDTH_PX; float right = dRect.right - BORDER_WIDTH_PX; mAlphaRect = new RectF(left, top, right, bottom); mAlphaPattern = new AlphaPatternDrawable((int) (5 * mDensity)); mAlphaPattern.setBounds( Math.round(mAlphaRect.left), Math.round(mAlphaRect.top), Math.round(mAlphaRect.right), Math.round(mAlphaRect.bottom) ); } /** * Set a OnColorChangedListener to get notified when the color * selected by the user has changed. * * @param listener */ public void setOnColorChangedListener(OnColorChangedListener listener) { mListener = listener; } /** * Get the color of the border surrounding all panels. */ public int getBorderColor() { return mBorderColor; } /** * Set the color of the border surrounding all panels. * * @param color */ public void setBorderColor(int color) { mBorderColor = color; invalidate(); } /** * Get the current color this view is showing. * * @return the current color. */ public int getColor() { return Color.HSVToColor(mAlpha, new float[]{mHue, mSat, mVal}); } /** * Set the color the view should show. * * @param color The color that should be selected. */ public void setColor(int color) { setColor(color, false); } /** * Set the color this view should show. * * @param color The color that should be selected. * @param callback If you want to get a callback to * your OnColorChangedListener. */ public void setColor(int color, boolean callback) { int alpha = Color.alpha(color); float[] hsv = new float[3]; Color.colorToHSV(color, hsv); mAlpha = alpha; mHue = hsv[0]; mSat = hsv[1]; mVal = hsv[2]; if (callback && mListener != null) { mListener.onColorChanged(Color.HSVToColor(mAlpha, new float[]{mHue, mSat, mVal})); } invalidate(); } /** * Get the drawing offset of the color picker view. * The drawing offset is the distance from the side of * a panel to the side of the view minus the padding. * Useful if you want to have your own panel below showing * the currently selected color and want to align it perfectly. * * @return The offset in pixels. */ public float getDrawingOffset() { return mDrawingOffset; } public boolean getAlphaSliderVisible() { return mShowAlphaPanel; } /** * Set if the user is allowed to adjust the alpha panel. Default is false. * If it is set to false no alpha will be set. * * @param visible */ public void setAlphaSliderVisible(boolean visible) { if (mShowAlphaPanel != visible) { mShowAlphaPanel = visible; /* * Reset all shader to force a recreation. * Otherwise they will not look right after * the size of the view has changed. */ mValShader = null; mSatShader = null; mHueShader = null; mAlphaShader = null; ; requestLayout(); } } public int getSliderTrackerColor() { return mSliderTrackerColor; } public void setSliderTrackerColor(int color) { mSliderTrackerColor = color; mHueTrackerPaint.setColor(mSliderTrackerColor); invalidate(); } /** * Set the text that should be shown in the * alpha slider. Set to null to disable text. * * @param res string resource id. */ public void setAlphaSliderText(int res) { String text = getContext().getString(res); setAlphaSliderText(text); } /** * Get the current value of the text * that will be shown in the alpha * slider. * * @return */ public String getAlphaSliderText() { return mAlphaSliderText; } /** * Set the text that should be shown in the * alpha slider. Set to null to disable text. * * @param text Text that should be shown. */ public void setAlphaSliderText(String text) { mAlphaSliderText = text; invalidate(); } public interface OnColorChangedListener { public void onColorChanged(int color); } }