120 lines
3.8 KiB
Java
120 lines
3.8 KiB
Java
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.fixedgridlayout;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.util.AttributeSet;
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import android.util.SparseIntArray;
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import android.view.Gravity;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.ViewDebug;
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/**
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* A layout that arranges its children in a grid. The size of the
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* cells is set by the {@link #setCellSize} method and the
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* android:cell_width and android:cell_height attributes in XML.
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* The number of rows and columns is determined at runtime. Each
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* cell contains exactly one view, and they flow in the natural
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* child order (the order in which they were added, or the index
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* in {@link #addViewAt}. Views can not span multiple cells.
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*/
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public class FixedGridLayout extends ViewGroup {
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int mCellWidth;
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int mCellHeight;
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public FixedGridLayout(Context context) {
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super(context);
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}
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public FixedGridLayout(Context context, AttributeSet attrs) {
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super(context, attrs);
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// Read the resource attributes.
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TypedArray a = context.obtainStyledAttributes(
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attrs, R.styleable.FixedGridLayout);
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mCellWidth = a.getDimensionPixelSize(
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R.styleable.FixedGridLayout_cellWidth, -1);
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mCellHeight = a.getDimensionPixelSize(
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R.styleable.FixedGridLayout_cellHeight, -1);
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a.recycle();
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}
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public void setCellWidth(int px) {
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mCellWidth = px;
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requestLayout();
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}
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public void setCellHeight(int px) {
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mCellHeight = px;
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requestLayout();
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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int cellWidthSpec = MeasureSpec.makeMeasureSpec(mCellWidth,
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MeasureSpec.AT_MOST);
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int cellHeightSpec = MeasureSpec.makeMeasureSpec(mCellHeight,
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MeasureSpec.AT_MOST);
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int count = getChildCount();
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for (int index=0; index<count; index++) {
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final View child = getChildAt(index);
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child.measure(cellWidthSpec, cellHeightSpec);
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}
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// Use the size our parents gave us
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setMeasuredDimension(resolveSize(mCellWidth*count, widthMeasureSpec),
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resolveSize(mCellHeight*count, heightMeasureSpec));
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}
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@Override
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protected void onLayout(boolean changed, int l, int t, int r, int b) {
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int cellWidth = mCellWidth;
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int cellHeight = mCellHeight;
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int columns = (r - l) / cellWidth;
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if (columns < 0) {
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columns = 1;
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}
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int x = 0;
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int y = 0;
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int i = 0;
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int count = getChildCount();
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for (int index=0; index<count; index++) {
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final View child = getChildAt(index);
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int w = child.getMeasuredWidth();
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int h = child.getMeasuredHeight();
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int left = x + ((cellWidth-w)/2);
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int top = y + ((cellHeight-h)/2);
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child.layout(left, top, left+w, top+h);
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if (i >= (columns-1)) {
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// advance to next row
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i = 0;
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x = 0;
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y += cellHeight;
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} else {
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i++;
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x += cellWidth;
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}
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}
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}
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}
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