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Diffstat (limited to 'tuner/src/com/android/tv/tuner/layout/ScaledLayout.java')
-rw-r--r--tuner/src/com/android/tv/tuner/layout/ScaledLayout.java290
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diff --git a/tuner/src/com/android/tv/tuner/layout/ScaledLayout.java b/tuner/src/com/android/tv/tuner/layout/ScaledLayout.java
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+++ b/tuner/src/com/android/tv/tuner/layout/ScaledLayout.java
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+/*
+ * Copyright (C) 2015 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.tv.tuner.layout;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Point;
+import android.graphics.Rect;
+import android.hardware.display.DisplayManager;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.Display;
+import android.view.View;
+import android.view.ViewGroup;
+import com.android.tv.tuner.R;
+import java.util.Arrays;
+import java.util.Comparator;
+
+/** A layout that scales its children using the given percentage value. */
+public class ScaledLayout extends ViewGroup {
+ private static final String TAG = "ScaledLayout";
+ private static final boolean DEBUG = false;
+ private static final Comparator<Rect> mRectTopLeftSorter =
+ new Comparator<Rect>() {
+ @Override
+ public int compare(Rect lhs, Rect rhs) {
+ if (lhs.top != rhs.top) {
+ return lhs.top - rhs.top;
+ } else {
+ return lhs.left - rhs.left;
+ }
+ }
+ };
+
+ private Rect[] mRectArray;
+ private final int mMaxWidth;
+ private final int mMaxHeight;
+
+ public ScaledLayout(Context context) {
+ this(context, null);
+ }
+
+ public ScaledLayout(Context context, AttributeSet attrs) {
+ this(context, attrs, 0);
+ }
+
+ public ScaledLayout(Context context, AttributeSet attrs, int defStyle) {
+ super(context, attrs, defStyle);
+ Point size = new Point();
+ DisplayManager displayManager =
+ (DisplayManager) getContext().getSystemService(Context.DISPLAY_SERVICE);
+ Display display = displayManager.getDisplay(Display.DEFAULT_DISPLAY);
+ display.getRealSize(size);
+ mMaxWidth = size.x;
+ mMaxHeight = size.y;
+ }
+
+ /**
+ * ScaledLayoutParams stores the four scale factors. <br>
+ * Vertical coordinate system: ({@code scaleStartRow} * 100) % ~ ({@code scaleEndRow} * 100) %
+ * Horizontal coordinate system: ({@code scaleStartCol} * 100) % ~ ({@code scaleEndCol} * 100) %
+ * <br>
+ * In XML, for example,
+ *
+ * <pre>{@code
+ * <View
+ * app:layout_scaleStartRow="0.1"
+ * app:layout_scaleEndRow="0.5"
+ * app:layout_scaleStartCol="0.4"
+ * app:layout_scaleEndCol="1" />
+ * }</pre>
+ */
+ public static class ScaledLayoutParams extends ViewGroup.LayoutParams {
+ public static final float SCALE_UNSPECIFIED = -1;
+ public final float scaleStartRow;
+ public final float scaleEndRow;
+ public final float scaleStartCol;
+ public final float scaleEndCol;
+
+ public ScaledLayoutParams(
+ float scaleStartRow, float scaleEndRow, float scaleStartCol, float scaleEndCol) {
+ super(MATCH_PARENT, MATCH_PARENT);
+ this.scaleStartRow = scaleStartRow;
+ this.scaleEndRow = scaleEndRow;
+ this.scaleStartCol = scaleStartCol;
+ this.scaleEndCol = scaleEndCol;
+ }
+
+ public ScaledLayoutParams(Context context, AttributeSet attrs) {
+ super(MATCH_PARENT, MATCH_PARENT);
+ TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.utScaledLayout);
+ scaleStartRow =
+ array.getFloat(
+ R.styleable.utScaledLayout_layout_scaleStartRow, SCALE_UNSPECIFIED);
+ scaleEndRow =
+ array.getFloat(
+ R.styleable.utScaledLayout_layout_scaleEndRow, SCALE_UNSPECIFIED);
+ scaleStartCol =
+ array.getFloat(
+ R.styleable.utScaledLayout_layout_scaleStartCol, SCALE_UNSPECIFIED);
+ scaleEndCol =
+ array.getFloat(
+ R.styleable.utScaledLayout_layout_scaleEndCol, SCALE_UNSPECIFIED);
+ array.recycle();
+ }
+ }
+
+ @Override
+ public LayoutParams generateLayoutParams(AttributeSet attrs) {
+ return new ScaledLayoutParams(getContext(), attrs);
+ }
+
+ @Override
+ protected boolean checkLayoutParams(LayoutParams p) {
+ return (p instanceof ScaledLayoutParams);
+ }
+
+ @Override
+ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+ int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);
+ int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec);
+ int width = widthSpecSize - getPaddingLeft() - getPaddingRight();
+ int height = heightSpecSize - getPaddingTop() - getPaddingBottom();
+ if (DEBUG) {
+ Log.d(TAG, String.format("onMeasure width: %d, height: %d", width, height));
+ }
+ int count = getChildCount();
+ mRectArray = new Rect[count];
+ for (int i = 0; i < count; ++i) {
+ View child = getChildAt(i);
+ ViewGroup.LayoutParams params = child.getLayoutParams();
+ float scaleStartRow, scaleEndRow, scaleStartCol, scaleEndCol;
+ if (!(params instanceof ScaledLayoutParams)) {
+ throw new RuntimeException(
+ "A child of ScaledLayout cannot have the UNSPECIFIED scale factors");
+ }
+ scaleStartRow = ((ScaledLayoutParams) params).scaleStartRow;
+ scaleEndRow = ((ScaledLayoutParams) params).scaleEndRow;
+ scaleStartCol = ((ScaledLayoutParams) params).scaleStartCol;
+ scaleEndCol = ((ScaledLayoutParams) params).scaleEndCol;
+ if (scaleStartRow < 0 || scaleStartRow > 1) {
+ throw new RuntimeException(
+ "A child of ScaledLayout should have a range of "
+ + "scaleStartRow between 0 and 1");
+ }
+ if (scaleEndRow < scaleStartRow || scaleStartRow > 1) {
+ throw new RuntimeException(
+ "A child of ScaledLayout should have a range of "
+ + "scaleEndRow between scaleStartRow and 1");
+ }
+ if (scaleEndCol < 0 || scaleEndCol > 1) {
+ throw new RuntimeException(
+ "A child of ScaledLayout should have a range of "
+ + "scaleStartCol between 0 and 1");
+ }
+ if (scaleEndCol < scaleStartCol || scaleEndCol > 1) {
+ throw new RuntimeException(
+ "A child of ScaledLayout should have a range of "
+ + "scaleEndCol between scaleStartCol and 1");
+ }
+ if (DEBUG) {
+ Log.d(
+ TAG,
+ String.format(
+ "onMeasure child scaleStartRow: %f scaleEndRow: %f "
+ + "scaleStartCol: %f scaleEndCol: %f",
+ scaleStartRow, scaleEndRow, scaleStartCol, scaleEndCol));
+ }
+ mRectArray[i] =
+ new Rect(
+ (int) (scaleStartCol * width),
+ (int) (scaleStartRow * height),
+ (int) (scaleEndCol * width),
+ (int) (scaleEndRow * height));
+ int scaleWidth = (int) (width * (scaleEndCol - scaleStartCol));
+ int childWidthSpec =
+ MeasureSpec.makeMeasureSpec(
+ scaleWidth > mMaxWidth ? mMaxWidth : scaleWidth, MeasureSpec.EXACTLY);
+ int childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
+ child.measure(childWidthSpec, childHeightSpec);
+
+ // If the height of the measured child view is bigger than the height of the calculated
+ // region by the given ScaleLayoutParams, the height of the region should be increased
+ // to fit the size of the child view.
+ if (child.getMeasuredHeight() > mRectArray[i].height()) {
+ int overflowedHeight = child.getMeasuredHeight() - mRectArray[i].height();
+ overflowedHeight = (overflowedHeight + 1) / 2;
+ mRectArray[i].bottom += overflowedHeight;
+ mRectArray[i].top -= overflowedHeight;
+ if (mRectArray[i].top < 0) {
+ mRectArray[i].bottom -= mRectArray[i].top;
+ mRectArray[i].top = 0;
+ }
+ if (mRectArray[i].bottom > height) {
+ mRectArray[i].top -= mRectArray[i].bottom - height;
+ mRectArray[i].bottom = height;
+ }
+ }
+ int scaleHeight = (int) (height * (scaleEndRow - scaleStartRow));
+ childHeightSpec =
+ MeasureSpec.makeMeasureSpec(
+ scaleHeight > mMaxHeight ? mMaxHeight : scaleHeight,
+ MeasureSpec.EXACTLY);
+ child.measure(childWidthSpec, childHeightSpec);
+ }
+
+ // Avoid overlapping rectangles.
+ // Step 1. Sort rectangles by position (top-left).
+ int visibleRectCount = 0;
+ int[] visibleRectGroup = new int[count];
+ Rect[] visibleRectArray = new Rect[count];
+ for (int i = 0; i < count; ++i) {
+ if (getChildAt(i).getVisibility() == View.VISIBLE) {
+ visibleRectGroup[visibleRectCount] = visibleRectCount;
+ visibleRectArray[visibleRectCount] = mRectArray[i];
+ ++visibleRectCount;
+ }
+ }
+ Arrays.sort(visibleRectArray, 0, visibleRectCount, mRectTopLeftSorter);
+
+ // Step 2. Move down if there are overlapping rectangles.
+ for (int i = 0; i < visibleRectCount - 1; ++i) {
+ for (int j = i + 1; j < visibleRectCount; ++j) {
+ if (Rect.intersects(visibleRectArray[i], visibleRectArray[j])) {
+ visibleRectGroup[j] = visibleRectGroup[i];
+ visibleRectArray[j].set(
+ visibleRectArray[j].left,
+ visibleRectArray[i].bottom,
+ visibleRectArray[j].right,
+ visibleRectArray[i].bottom + visibleRectArray[j].height());
+ }
+ }
+ }
+
+ // Step 3. Move up if there is any overflowed rectangle.
+ for (int i = visibleRectCount - 1; i >= 0; --i) {
+ if (visibleRectArray[i].bottom > height) {
+ int overflowedHeight = visibleRectArray[i].bottom - height;
+ for (int j = 0; j <= i; ++j) {
+ if (visibleRectGroup[i] == visibleRectGroup[j]) {
+ visibleRectArray[j].set(
+ visibleRectArray[j].left,
+ visibleRectArray[j].top - overflowedHeight,
+ visibleRectArray[j].right,
+ visibleRectArray[j].bottom - overflowedHeight);
+ }
+ }
+ }
+ }
+ setMeasuredDimension(widthSpecSize, heightSpecSize);
+ }
+
+ @Override
+ protected void onLayout(boolean changed, int l, int t, int r, int b) {
+ int paddingLeft = getPaddingLeft();
+ int paddingTop = getPaddingTop();
+ int count = getChildCount();
+ for (int i = 0; i < count; ++i) {
+ View child = getChildAt(i);
+ if (child.getVisibility() != GONE) {
+ int childLeft = paddingLeft + mRectArray[i].left;
+ int childTop = paddingTop + mRectArray[i].top;
+ int childBottom = paddingLeft + mRectArray[i].bottom;
+ int childRight = paddingTop + mRectArray[i].right;
+ if (DEBUG) {
+ Log.d(
+ TAG,
+ String.format(
+ "layoutChild bottom: %d left: %d right: %d top: %d",
+ childBottom, childLeft, childRight, childTop));
+ }
+ child.layout(childLeft, childTop, childRight, childBottom);
+ }
+ }
+ }
+}
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