/*
* Copyright (C) 2010 Daniel Nilsson
*
* 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.
*
*
*
*
* Change Log:
*
* 1.1
* - Fixed buggy measure and layout code. You can now make the view any size you want.
* - Optimization of the drawing using a bitmap cache, a lot faster!
* - Support for hardware acceleration for all but the problematic
* part of the view will still be software rendered but much faster!
* See comment in drawSatValPanel() for more info.
* - Support for declaring some variables in xml.
*/
package com.scheffsblend.iconfilters;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
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 {
public interface OnColorChangedListener {
public void onColorChanged(int newColor);
}
private final static int PANEL_SAT_VAL = 0;
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 static float mDensity = 1f;
private OnColorChangedListener mListener;
private Paint mSatValPaint;
private Paint mSatValTrackerPaint;
private Paint mHuePaint;
private Paint mHueAlphaTrackerPaint;
private Paint mAlphaPaint;
private Paint mAlphaTextPaint;
private Paint mBorderPaint;
private Shader mValShader;
private Shader mSatShader;
private Shader mHueShader;
private Shader mAlphaShader;
/*
* We cache a bitmap of the sat/val panel which is expensive to draw each time.
* We can reuse it when the user is sliding the circle picker as long as the hue isn't changed.
*/
private BitmapCache mSatValBackgroundCache;
private int mAlpha = 0xff;
private float mHue = 360f;
private float mSat = 0f;
private float mVal = 0f;
private String mAlphaSliderText = null;
private int mSliderTrackerColor = 0xFFBDBDBD;
private int mBorderColor = 0xFF6E6E6E;
private boolean mShowAlphaPanel = false;
/*
* To remember which panel that has the "focus" when
* processing hardware button data.
*/
private int mLastTouchedPanel = PANEL_SAT_VAL;
/**
* Offset from the edge we must have or else
* the finger tracker will get clipped when
* it is drawn outside of the view.
*/
private int 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(attrs);
}
private void init(AttributeSet attrs) {
//Load those if set in xml resource file.
TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.ColorPickerView);
mShowAlphaPanel = a.getBoolean(R.styleable.ColorPickerView_alphaChannelVisible, false);
mAlphaSliderText = a.getString(R.styleable.ColorPickerView_alphaChannelText);
mSliderTrackerColor = a.getColor(R.styleable.ColorPickerView_colorPickerSliderColor, 0xFFBDBDBD);
mBorderColor = a.getColor(R.styleable.ColorPickerView_colorPickerBorderColor, 0xFF6E6E6E);
a.recycle();
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();
mHueAlphaTrackerPaint = new Paint();
mAlphaPaint = new Paint();
mAlphaTextPaint = new Paint();
mBorderPaint = new Paint();
mSatValTrackerPaint.setStyle(Style.STROKE);
mSatValTrackerPaint.setStrokeWidth(2f * mDensity);
mSatValTrackerPaint.setAntiAlias(true);
mHueAlphaTrackerPaint.setColor(mSliderTrackerColor);
mHueAlphaTrackerPaint.setStyle(Style.STROKE);
mHueAlphaTrackerPaint.setStrokeWidth(2f * mDensity);
mHueAlphaTrackerPaint.setAntiAlias(true);
mAlphaTextPaint.setColor(0xff1c1c1c);
mAlphaTextPaint.setTextSize(14f * mDensity);
mAlphaTextPaint.setAntiAlias(true);
mAlphaTextPaint.setTextAlign(Align.CENTER);
mAlphaTextPaint.setFakeBoldText(true);
}
private int calculateRequiredOffset() {
float offset = Math.max(PALETTE_CIRCLE_TRACKER_RADIUS, RECTANGLE_TRACKER_OFFSET);
offset = Math.max(offset, BORDER_WIDTH_PX * mDensity);
return (int) (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) {
/*
* Draw time for this code without using bitmap cache and hardware acceleration was around 20ms.
* Now with the bitmap cache and the ability to use hardware acceleration we are down at 1ms as long as the hue isn't changed.
* If the hue is changed we the sat/val rectangle will be rendered in software and it takes around 10ms.
* But since the rest of the view will be rendered in hardware the performance gain is big!
*/
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) {
//Black gradient has either not been created or the view has been resized.
mValShader = new LinearGradient(rect.left, rect.top, rect.left, rect.bottom,
0xffffffff, 0xff000000, TileMode.CLAMP);
}
//If the hue has changed we need to recreate the cache.
if (mSatValBackgroundCache == null || mSatValBackgroundCache.value != mHue) {
if (mSatValBackgroundCache == null) {
mSatValBackgroundCache = new BitmapCache();
}
//We create our bitmap in the cache if it doesn't exist.
if (mSatValBackgroundCache.bitmap == null) {
mSatValBackgroundCache.bitmap = Bitmap.createBitmap((int) rect.width(), (int) rect.height(), Config.ARGB_8888);
}
//We create the canvas once so we can draw on our bitmap and the hold on to it.
if (mSatValBackgroundCache.canvas == null) {
mSatValBackgroundCache.canvas = new Canvas(mSatValBackgroundCache.bitmap);
}
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);
//Finally we draw on our canvas, the result will be stored in our bitmap which is already in the cache.
//Since this is drawn on a canvas not rendered on screen it will automatically not be using the hardware acceleration.
//And this was the code that wasn't supported by hardware acceleration which mean there is no need to turn it of anymore.
//The rest of the view will still be hardware accelerated!!
mSatValBackgroundCache.canvas.drawRect(0, 0, mSatValBackgroundCache.bitmap.getWidth(), mSatValBackgroundCache.bitmap.getHeight(), mSatValPaint);
//We set the hue value in our cache to which hue it was drawn with,
//then we know that if it hasn't changed we can reuse our cached bitmap.
mSatValBackgroundCache.value = mHue;
}
//We draw our bitmap from the cached, if the hue has changed
//then it was just recreated otherwise the old one will be used.
canvas.drawBitmap(mSatValBackgroundCache.bitmap, null, rect, null);
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) {
/*
* Drawn with hw acceleration, very fast.
*/
//long start = SystemClock.elapsedRealtime();
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) {
//The hue shader has either not yet been created or the view has been resized.
mHueShader = new LinearGradient(0, 0, 0, rect.height(), 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, mHueAlphaTrackerPaint);
//Log.d("mColorPicker", "Draw Time Hue: " + (SystemClock.elapsedRealtime() - start) + "ms");
}
private void drawAlphaPanel(Canvas canvas) {
/*
* Will be drawn with hw acceleration, very fast.
*/
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.equals("")) {
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, mHueAlphaTrackerPaint);
}
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 finalWidth = 0;
int finalHeight = 0;
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int widthAllowed = MeasureSpec.getSize(widthMeasureSpec);
int heightAllowed = MeasureSpec.getSize(heightMeasureSpec);
//Log.d("color-picker-view", "widthMode: " + modeToString(widthMode) + " heightMode: " + modeToString(heightMode) + " widthAllowed: " + widthAllowed + " heightAllowed: " + heightAllowed);
if (widthMode == MeasureSpec.EXACTLY || heightMode == MeasureSpec.EXACTLY) {
//A exact value has been set in either direction, we need to stay within this size.
if (widthMode == MeasureSpec.EXACTLY && heightMode != MeasureSpec.EXACTLY) {
//The with has been specified exactly, we need to adopt the height to fit.
int h = (int) (widthAllowed - PANEL_SPACING - HUE_PANEL_WIDTH);
if (mShowAlphaPanel) {
h += PANEL_SPACING + ALPHA_PANEL_HEIGHT;
}
if (h > heightAllowed) {
//We can't fit the view in this container, set the size to whatever was allowed.
finalHeight = heightAllowed;
} else {
finalHeight = h;
}
finalWidth = widthAllowed;
} else if (heightMode == MeasureSpec.EXACTLY && widthMode != MeasureSpec.EXACTLY) {
//The height has been specified exactly, we need to stay within this height and adopt the width.
int w = (int) (heightAllowed + PANEL_SPACING + HUE_PANEL_WIDTH);
if (mShowAlphaPanel) {
w -= PANEL_SPACING - ALPHA_PANEL_HEIGHT;
}
if (w > widthAllowed) {
//we can't fit within this container, set the size to whatever was allowed.
finalWidth = widthAllowed;
} else {
finalWidth = w;
}
finalHeight = heightAllowed;
} else {
//If we get here the dev has set the width and height to exact sizes. For example match_parent or 300dp.
//This will mean that the sat/val panel will not be square but it doesn't matter. It will work anyway.
//In all other senarios our goal is to make that panel square.
//We set the sizes to exactly what we were told.
finalWidth = widthAllowed;
finalHeight = heightAllowed;
}
} else {
//If no exact size has been set we try to make our view as big as possible
//within the allowed space.
//Calculate the needed with to layout the view based on the allowed height.
int widthNeeded = (int) (heightAllowed + PANEL_SPACING + HUE_PANEL_WIDTH);
//Calculate the needed height to layout the view based on the allowed width.
int heightNeeded = (int) (widthAllowed - PANEL_SPACING - HUE_PANEL_WIDTH);
if (mShowAlphaPanel) {
widthNeeded -= (PANEL_SPACING + ALPHA_PANEL_HEIGHT);
heightNeeded += PANEL_SPACING + ALPHA_PANEL_HEIGHT;
}
if (widthNeeded <= widthAllowed) {
finalWidth = widthNeeded;
finalHeight = heightAllowed;
} else if (heightNeeded <= heightAllowed) {
finalHeight = heightNeeded;
finalWidth = widthAllowed;
}
}
//Log.d("mColorPicker", "Final Size: " + finalWidth + "x" + finalHeight);
setMeasuredDimension(finalWidth, finalHeight);
}
private String modeToString(int mode) {
switch (mode) {
case MeasureSpec.AT_MOST:
return "AT MOST";
case MeasureSpec.EXACTLY:
return "EXACTLY";
case MeasureSpec.UNSPECIFIED:
return "UNSPECIFIED";
}
return "ERROR";
}
private int getPreferredWidth() {
//Our preferred width and height is 200dp for the square sat / val rectangle.
int width = (int) (200 * mDensity);
return (int) (width + HUE_PANEL_WIDTH + PANEL_SPACING);
}
private int getPreferredHeight() {
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();
//The need to be recreated because they depend on the size of the view.
mValShader = null;
mSatShader = null;
mHueShader = null;
mAlphaShader = null;
;
setUpSatValRect();
setUpHueRect();
setUpAlphaRect();
}
private void setUpSatValRect() {
//Calculate the size for the big color rectangle.
final RectF dRect = mDrawingRect;
float left = dRect.left + BORDER_WIDTH_PX;
float top = dRect.top + BORDER_WIDTH_PX;
float bottom = dRect.bottom - BORDER_WIDTH_PX;
float right = dRect.right - BORDER_WIDTH_PX - PANEL_SPACING - HUE_PANEL_WIDTH;
if (mShowAlphaPanel) {
bottom -= (ALPHA_PANEL_HEIGHT + PANEL_SPACING);
}
mSatValRect = new RectF(left, top, right, bottom);
}
private void setUpHueRect() {
//Calculate the size for the hue slider on the left.
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 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);
int red = Color.red(color);
int blue = Color.blue(color);
int green = Color.green(color);
float[] hsv = new float[3];
Color.RGBToHSV(red, green, blue, 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;
}
/**
* 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();
}
}
/**
* Set the color of the tracker slider on the hue and alpha panel.
*
* @param color
*/
public void setSliderTrackerColor(int color) {
mSliderTrackerColor = color;
mHueAlphaTrackerPaint.setColor(mSliderTrackerColor);
invalidate();
}
/**
* Get color of the tracker slider on the hue and alpha panel.
*
* @return
*/
public int getSliderTrackerColor() {
return mSliderTrackerColor;
}
/**
* Set the color of the border surrounding all panels.
*
* @param color
*/
public void setBorderColor(int color) {
mBorderColor = color;
invalidate();
}
/**
* Get the color of the border surrounding all panels.
*/
public int getBorderColor() {
return mBorderColor;
}
/**
* 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);
}
/**
* 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();
}
/**
* Get the current value of the text
* that will be shown in the alpha
* slider.
*
* @return
*/
public String getAlphaSliderText() {
return mAlphaSliderText;
}
private class BitmapCache {
public Canvas canvas;
public Bitmap bitmap;
public float value;
}
}