| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * 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 com.android.calculator2; |
| |
| import android.content.Context; |
| import android.content.res.TypedArray; |
| import android.util.AttributeSet; |
| import android.view.View; |
| import android.view.ViewGroup; |
| |
| /** |
| * A layout that places children in an evenly distributed grid based on the specified |
| * {@link android.R.attr#columnCount} and {@link android.R.attr#rowCount} attributes. |
| */ |
| public class CalculatorPadLayout extends ViewGroup { |
| |
| private int mRowCount; |
| private int mColumnCount; |
| |
| public CalculatorPadLayout(Context context) { |
| this(context, null); |
| } |
| |
| public CalculatorPadLayout(Context context, AttributeSet attrs) { |
| this(context, attrs, 0); |
| } |
| |
| public CalculatorPadLayout(Context context, AttributeSet attrs, int defStyle) { |
| super(context, attrs, defStyle); |
| |
| final TypedArray a = context.obtainStyledAttributes(attrs, |
| new int[] { android.R.attr.rowCount, android.R.attr.columnCount }, defStyle, 0); |
| mRowCount = a.getInt(0, 1); |
| mColumnCount = a.getInt(1, 1); |
| |
| a.recycle(); |
| } |
| |
| @Override |
| public boolean shouldDelayChildPressedState() { |
| return false; |
| } |
| |
| @Override |
| protected void onLayout(boolean changed, int left, int top, int right, int bottom) { |
| final int paddingLeft = getPaddingLeft(); |
| final int paddingRight = getPaddingRight(); |
| final int paddingTop = getPaddingTop(); |
| final int paddingBottom = getPaddingBottom(); |
| |
| final boolean isRTL = getLayoutDirection() == LAYOUT_DIRECTION_RTL; |
| final int columnWidth = |
| Math.round((float) (right - left - paddingLeft - paddingRight)) / mColumnCount; |
| final int rowHeight = |
| Math.round((float) (bottom - top - paddingTop - paddingBottom)) / mRowCount; |
| |
| int rowIndex = 0, columnIndex = 0; |
| for (int childIndex = 0; childIndex < getChildCount(); ++childIndex) { |
| final View childView = getChildAt(childIndex); |
| if (childView.getVisibility() == View.GONE) { |
| continue; |
| } |
| |
| final MarginLayoutParams lp = (MarginLayoutParams) childView.getLayoutParams(); |
| |
| final int childTop = paddingTop + lp.topMargin + rowIndex * rowHeight; |
| final int childBottom = childTop - lp.topMargin - lp.bottomMargin + rowHeight; |
| final int childLeft = paddingLeft + lp.leftMargin + |
| (isRTL ? (mColumnCount - 1) - columnIndex : columnIndex) * columnWidth; |
| final int childRight = childLeft - lp.leftMargin - lp.rightMargin + columnWidth; |
| |
| final int childWidth = childRight - childLeft; |
| final int childHeight = childBottom - childTop; |
| if (childWidth != childView.getMeasuredWidth() || |
| childHeight != childView.getMeasuredHeight()) { |
| childView.measure( |
| MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.EXACTLY), |
| MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.EXACTLY)); |
| } |
| childView.layout(childLeft, childTop, childRight, childBottom); |
| |
| rowIndex = (rowIndex + (columnIndex + 1) / mColumnCount) % mRowCount; |
| columnIndex = (columnIndex + 1) % mColumnCount; |
| } |
| } |
| |
| @Override |
| public LayoutParams generateLayoutParams(AttributeSet attrs) { |
| return new MarginLayoutParams(getContext(), attrs); |
| } |
| |
| @Override |
| protected LayoutParams generateDefaultLayoutParams() { |
| return new MarginLayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); |
| } |
| |
| @Override |
| protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { |
| return new MarginLayoutParams(p); |
| } |
| |
| @Override |
| protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { |
| return p instanceof MarginLayoutParams; |
| } |
| } |