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Diffstat (limited to 'org_apg/src/org/apg/ui/widget/DashboardLayout.java')
| -rw-r--r-- | org_apg/src/org/apg/ui/widget/DashboardLayout.java | 186 |
1 files changed, 0 insertions, 186 deletions
diff --git a/org_apg/src/org/apg/ui/widget/DashboardLayout.java b/org_apg/src/org/apg/ui/widget/DashboardLayout.java deleted file mode 100644 index 8cd97ca05..000000000 --- a/org_apg/src/org/apg/ui/widget/DashboardLayout.java +++ /dev/null @@ -1,186 +0,0 @@ -/* - * Copyright 2011 Google Inc. - * - * 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 org.apg.ui.widget; - -import android.content.Context; -import android.util.AttributeSet; -import android.view.View; -import android.view.ViewGroup; - -/** - * Custom layout that arranges children in a grid-like manner, optimizing for even horizontal and - * vertical whitespace. - */ -public class DashboardLayout extends ViewGroup { - private static final int UNEVEN_GRID_PENALTY_MULTIPLIER = 10; - - private int mMaxChildWidth = 0; - private int mMaxChildHeight = 0; - - public DashboardLayout(Context context) { - super(context, null); - } - - public DashboardLayout(Context context, AttributeSet attrs) { - super(context, attrs, 0); - } - - public DashboardLayout(Context context, AttributeSet attrs, int defStyle) { - super(context, attrs, defStyle); - } - - @Override - protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { - mMaxChildWidth = 0; - mMaxChildHeight = 0; - - // Measure once to find the maximum child size. - - int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec( - MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.AT_MOST); - int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( - MeasureSpec.getSize(heightMeasureSpec), MeasureSpec.AT_MOST); - - final int count = getChildCount(); - for (int i = 0; i < count; i++) { - final View child = getChildAt(i); - if (child.getVisibility() == GONE) { - continue; - } - - child.measure(childWidthMeasureSpec, childHeightMeasureSpec); - - mMaxChildWidth = Math.max(mMaxChildWidth, child.getMeasuredWidth()); - mMaxChildHeight = Math.max(mMaxChildHeight, child.getMeasuredHeight()); - } - - // Measure again for each child to be exactly the same size. - - childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(mMaxChildWidth, MeasureSpec.EXACTLY); - childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(mMaxChildHeight, MeasureSpec.EXACTLY); - - for (int i = 0; i < count; i++) { - final View child = getChildAt(i); - if (child.getVisibility() == GONE) { - continue; - } - - child.measure(childWidthMeasureSpec, childHeightMeasureSpec); - } - - setMeasuredDimension(resolveSize(mMaxChildWidth, widthMeasureSpec), - resolveSize(mMaxChildHeight, heightMeasureSpec)); - } - - @Override - protected void onLayout(boolean changed, int l, int t, int r, int b) { - int width = r - l; - int height = b - t; - - final int count = getChildCount(); - - // Calculate the number of visible children. - int visibleCount = 0; - for (int i = 0; i < count; i++) { - final View child = getChildAt(i); - if (child.getVisibility() == GONE) { - continue; - } - ++visibleCount; - } - - if (visibleCount == 0) { - return; - } - - // Calculate what number of rows and columns will optimize for even horizontal and - // vertical whitespace between items. Start with a 1 x N grid, then try 2 x N, and so on. - int bestSpaceDifference = Integer.MAX_VALUE; - int spaceDifference; - - // Horizontal and vertical space between items - int hSpace = 0; - int vSpace = 0; - - int cols = 1; - int rows; - - while (true) { - rows = (visibleCount - 1) / cols + 1; - - hSpace = ((width - mMaxChildWidth * cols) / (cols + 1)); - vSpace = ((height - mMaxChildHeight * rows) / (rows + 1)); - - spaceDifference = Math.abs(vSpace - hSpace); - if (rows * cols != visibleCount) { - spaceDifference *= UNEVEN_GRID_PENALTY_MULTIPLIER; - } else if (rows * mMaxChildHeight > height || cols * mMaxChildWidth > width) { - spaceDifference *= UNEVEN_GRID_PENALTY_MULTIPLIER; - } - - if (spaceDifference < bestSpaceDifference) { - // Found a better whitespace squareness/ratio - bestSpaceDifference = spaceDifference; - - // If we found a better whitespace squareness and there's only 1 row, this is - // the best we can do. - if (rows == 1) { - break; - } - } else { - // This is a worse whitespace ratio, use the previous value of cols and exit. - --cols; - rows = (visibleCount - 1) / cols + 1; - hSpace = ((width - mMaxChildWidth * cols) / (cols + 1)); - vSpace = ((height - mMaxChildHeight * rows) / (rows + 1)); - break; - } - - ++cols; - } - - // Lay out children based on calculated best-fit number of rows and cols. - - // If we chose a layout that has negative horizontal or vertical space, force it to zero. - hSpace = Math.max(0, hSpace); - vSpace = Math.max(0, vSpace); - - // Re-use width/height variables to be child width/height. - width = (width - hSpace * (cols + 1)) / cols; - height = (height - vSpace * (rows + 1)) / rows; - - int left, top; - int col, row; - int visibleIndex = 0; - for (int i = 0; i < count; i++) { - final View child = getChildAt(i); - if (child.getVisibility() == GONE) { - continue; - } - - row = visibleIndex / cols; - col = visibleIndex % cols; - - left = hSpace * (col + 1) + width * col; - top = vSpace * (row + 1) + height * row; - - child.layout(left, top, (hSpace == 0 && col == cols - 1) ? r : (left + width), - (vSpace == 0 && row == rows - 1) ? b : (top + height)); - ++visibleIndex; - } - } -}
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