src/com/android/tv/tuner/layout/ScaledLayout.java - platform/packages/apps/TV - Git at Google

 /*
  * 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);
             }
         }
     }
 }
	/*
	* 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);
	}
	}
	}
	}