transdroid/app/src/main/java/net/margaritov/preference/colorpicker/ColorPickerPanelView.java

/*
 * 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.
 */

package net.margaritov.preference.colorpicker;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

/**
 * This class draws a panel which which will be filled with a color which can be set.
 * It can be used to show the currently selected color which you will get from
 * the {@link ColorPickerView}.
 * @author Daniel Nilsson
 */
public class ColorPickerPanelView extends View {

	/**
	 * The width in pixels of the border
	 * surrounding the color panel.
	 */
	private final static float BORDER_WIDTH_PX = 1;

	private float mDensity = 1f;

	private int mBorderColor = 0xff6E6E6E;
	private int mColor = 0xff000000;

	private Paint mBorderPaint;
	private Paint mColorPaint;

	private RectF mDrawingRect;
	private RectF mColorRect;

	private AlphaPatternDrawable mAlphaPattern;


	public ColorPickerPanelView(Context context) {
		this(context, null);
	}

	public ColorPickerPanelView(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
	}

	public ColorPickerPanelView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		init();
	}

	private void init() {
		mBorderPaint = new Paint();
		mColorPaint = new Paint();
		mDensity = getContext().getResources().getDisplayMetrics().density;
	}


	@Override
	protected void onDraw(Canvas canvas) {

		final RectF rect = mColorRect;

		if (BORDER_WIDTH_PX > 0) {
			mBorderPaint.setColor(mBorderColor);
			canvas.drawRect(mDrawingRect, mBorderPaint);
		}

		if (mAlphaPattern != null) {
			mAlphaPattern.draw(canvas);
		}

		mColorPaint.setColor(mColor);

		canvas.drawRect(rect, mColorPaint);
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

		int width = MeasureSpec.getSize(widthMeasureSpec);
		int height = MeasureSpec.getSize(heightMeasureSpec);

		setMeasuredDimension(width, height);
	}

	@Override
	protected void onSizeChanged(int w, int h, int oldw, int oldh) {
		super.onSizeChanged(w, h, oldw, oldh);

		mDrawingRect = new RectF();
		mDrawingRect.left = getPaddingLeft();
		mDrawingRect.right = w - getPaddingRight();
		mDrawingRect.top = getPaddingTop();
		mDrawingRect.bottom = h - getPaddingBottom();

		setUpColorRect();

	}

	private void setUpColorRect() {
		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;

		mColorRect = new RectF(left, top, right, bottom);

		mAlphaPattern = new AlphaPatternDrawable((int) (5 * mDensity));

		mAlphaPattern.setBounds(Math.round(mColorRect.left), Math.round(mColorRect.top), Math.round(mColorRect.right),
				Math.round(mColorRect.bottom));

	}

	/**
	 * Set the color that should be shown by this view.
	 * @param color
	 */
	public void setColor(int color) {
		mColor = color;
		invalidate();
	}

	/**
	 * Get the color currently show by this view.
	 * @return
	 */
	public int getColor() {
		return mColor;
	}

	/**
	 * Set the color of the border surrounding the panel.
	 * @param color
	 */
	public void setBorderColor(int color) {
		mBorderColor = color;
		invalidate();
	}

	/**
	 * Get the color of the border surrounding the panel.
	 */
	public int getBorderColor() {
		return mBorderColor;
	}

}