Back to project page android-spinnerwheel.
The source code is released under:
Apache License
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/* * android-spinnerwheel//from w ww .j a v a2 s .c o m * https://github.com/ai212983/android-spinnerwheel * * based on * * Android Wheel Control. * https://code.google.com/p/android-wheel/ * * Copyright 2011 Yuri Kanivets * * 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 antistatic.spinnerwheel; import android.content.Context; import android.content.res.TypedArray; import android.graphics.*; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.ViewGroup.LayoutParams; import android.widget.LinearLayout; /** * Spinner wheel vertical view. * * @author Yuri Kanivets * @author Dimitri Fedorov */ public class WheelVerticalView extends AbstractWheelView { private static int itemID = -1; @SuppressWarnings("unused") private final String LOG_TAG = WheelVerticalView.class.getName() + " #" + (++itemID); /** * The height of the selection divider. */ protected int mSelectionDividerHeight; // Cached item height private int mItemHeight = 0; //-------------------------------------------------------------------------- // // Constructors // //-------------------------------------------------------------------------- /** * Create a new wheel vertical view. * * @param context The application environment. */ public WheelVerticalView(Context context) { this(context, null); } /** * Create a new wheel vertical view. * * @param context The application environment. * @param attrs A collection of attributes. */ public WheelVerticalView(Context context, AttributeSet attrs) { this(context, attrs, R.attr.abstractWheelViewStyle); } /** * Create a new wheel vertical view. * * @param context the application environment. * @param attrs a collection of attributes. * @param defStyle The default style to apply to this view. */ public WheelVerticalView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } //-------------------------------------------------------------------------- // // Initiating assets and setter for selector paint // //-------------------------------------------------------------------------- @Override protected void initAttributes(AttributeSet attrs, int defStyle) { super.initAttributes(attrs, defStyle); TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.WheelVerticalView, defStyle, 0); mSelectionDividerHeight = a.getDimensionPixelSize(R.styleable.WheelVerticalView_selectionDividerHeight, DEF_SELECTION_DIVIDER_SIZE); a.recycle(); } @Override public void setSelectorPaintCoeff(float coeff) { LinearGradient shader; int h = getMeasuredHeight(); int ih = getItemDimension(); float p1 = (1 - ih/(float) h)/2; float p2 = (1 + ih/(float) h)/2; float z = mItemsDimmedAlpha * (1 - coeff); float c1f = z + 255 * coeff; if (mVisibleItems == 2) { int c1 = Math.round( c1f ) << 24; int c2 = Math.round( z ) << 24; int[] colors = {c2, c1, 0xff000000, 0xff000000, c1, c2}; float[] positions = { 0, p1, p1, p2, p2, 1}; shader = new LinearGradient(0, 0, 0, h, colors, positions, Shader.TileMode.CLAMP); } else { float p3 = (1 - ih*3/(float) h)/2; float p4 = (1 + ih*3/(float) h)/2; float s = 255 * p3/p1; float c3f = s * coeff ; // here goes some optimized stuff float c2f = z + c3f; int c1 = Math.round( c1f ) << 24; int c2 = Math.round( c2f ) << 24; int c3 = Math.round( c3f ) << 24; int[] colors = {0, c3, c2, c1, 0xff000000, 0xff000000, c1, c2, c3, 0}; float[] positions = {0, p3, p3, p1, p1, p2, p2, p4, p4, 1}; shader = new LinearGradient(0, 0, 0, h, colors, positions, Shader.TileMode.CLAMP); } mSelectorWheelPaint.setShader(shader); invalidate(); } //-------------------------------------------------------------------------- // // Scroller-specific methods // //-------------------------------------------------------------------------- @Override protected WheelScroller createScroller(WheelScroller.ScrollingListener scrollingListener) { return new WheelVerticalScroller(getContext(), scrollingListener); } @Override protected float getMotionEventPosition(MotionEvent event) { return event.getY(); } //-------------------------------------------------------------------------- // // Base measurements // //-------------------------------------------------------------------------- @Override protected int getBaseDimension() { return getHeight(); } /** * Returns height of the spinnerwheel * @return the item height */ @Override protected int getItemDimension() { if (mItemHeight != 0) { return mItemHeight; } if (mItemsLayout != null && mItemsLayout.getChildAt(0) != null) { mItemHeight = mItemsLayout.getChildAt(0).getMeasuredHeight(); return mItemHeight; } return getBaseDimension() / mVisibleItems; } //-------------------------------------------------------------------------- // // Layout creation and measurement operations // //-------------------------------------------------------------------------- /** * Creates item layout if necessary */ @Override protected void createItemsLayout() { if (mItemsLayout == null) { mItemsLayout = new LinearLayout(getContext()); mItemsLayout.setOrientation(LinearLayout.VERTICAL); } } @Override protected void doItemsLayout() { mItemsLayout.layout(0, 0, getMeasuredWidth() - 2 * mItemsPadding, getMeasuredHeight()); } @Override protected void measureLayout() { mItemsLayout.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); mItemsLayout.measure( MeasureSpec.makeMeasureSpec(getWidth() - 2 * mItemsPadding, MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED) ); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int widthMode = MeasureSpec.getMode(widthMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int widthSize = MeasureSpec.getSize(widthMeasureSpec); int heightSize = MeasureSpec.getSize(heightMeasureSpec); rebuildItems(); // rebuilding before measuring int width = calculateLayoutWidth(widthSize, widthMode); int height; if (heightMode == MeasureSpec.EXACTLY) { height = heightSize; } else { height = Math.max( getItemDimension() * (mVisibleItems - mItemOffsetPercent / 100), getSuggestedMinimumHeight() ); if (heightMode == MeasureSpec.AT_MOST) { height = Math.min(height, heightSize); } } setMeasuredDimension(width, height); } /** * Calculates control width * @param widthSize the input layout width * @param mode the layout mode * @return the calculated control width */ private int calculateLayoutWidth(int widthSize, int mode) { mItemsLayout.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); mItemsLayout.measure( MeasureSpec.makeMeasureSpec(widthSize, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED) ); int width = mItemsLayout.getMeasuredWidth(); if (mode == MeasureSpec.EXACTLY) { width = widthSize; } else { width += 2 * mItemsPadding; // Check against our minimum width width = Math.max(width, getSuggestedMinimumWidth()); if (mode == MeasureSpec.AT_MOST && widthSize < width) { width = widthSize; } } // forcing recalculating mItemsLayout.measure( MeasureSpec.makeMeasureSpec(width - 2 * mItemsPadding, MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED) ); return width; } //-------------------------------------------------------------------------- // // Drawing items // //-------------------------------------------------------------------------- @Override protected void drawItems(Canvas canvas) { canvas.save(); int w = getMeasuredWidth(); int h = getMeasuredHeight(); int ih = getItemDimension(); // resetting intermediate bitmap and recreating canvases mSpinBitmap.eraseColor(0); Canvas c = new Canvas(mSpinBitmap); Canvas cSpin = new Canvas(mSpinBitmap); int top = (mCurrentItemIdx - mFirstItemIdx) * ih + (ih - getHeight()) / 2; c.translate(mItemsPadding, - top + mScrollingOffset); mItemsLayout.draw(c); mSeparatorsBitmap.eraseColor(0); Canvas cSeparators = new Canvas(mSeparatorsBitmap); if (mSelectionDivider != null) { // draw the top divider int topOfTopDivider = (getHeight() - ih - mSelectionDividerHeight) / 2; int bottomOfTopDivider = topOfTopDivider + mSelectionDividerHeight; mSelectionDivider.setBounds(0, topOfTopDivider, w, bottomOfTopDivider); mSelectionDivider.draw(cSeparators); // draw the bottom divider int topOfBottomDivider = topOfTopDivider + ih; int bottomOfBottomDivider = bottomOfTopDivider + ih; mSelectionDivider.setBounds(0, topOfBottomDivider, w, bottomOfBottomDivider); mSelectionDivider.draw(cSeparators); } cSpin.drawRect(0, 0, w, h, mSelectorWheelPaint); cSeparators.drawRect(0, 0, w, h, mSeparatorsPaint); canvas.drawBitmap(mSpinBitmap, 0, 0, null); canvas.drawBitmap(mSeparatorsBitmap, 0, 0, null); canvas.restore(); } }