Merge "Move caption view from Settings into framework" into klp-dev (a052d5a7) · Commits · e / os / android_frameworks_base

core/java/com/android/internal/widget/SubtitleView.java

0 → 100644

+365 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2013 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.internal.widget;

		import android.content.ContentResolver;
		import android.content.Context;
		import android.content.res.Resources.Theme;
		import android.content.res.Resources;
		import android.content.res.TypedArray;
		import android.graphics.Canvas;
		import android.graphics.Color;
		import android.graphics.Paint;
		import android.graphics.Paint.Join;
		import android.graphics.Paint.Style;
		import android.graphics.RectF;
		import android.graphics.Typeface;
		import android.text.Layout.Alignment;
		import android.text.StaticLayout;
		import android.text.TextPaint;
		import android.text.TextUtils;
		import android.util.AttributeSet;
		import android.util.DisplayMetrics;
		import android.util.TypedValue;
		import android.view.View;
		import android.view.accessibility.CaptioningManager.CaptionStyle;

		public class SubtitleView extends View {
		// Ratio of inner padding to font size.
		private static final float INNER_PADDING_RATIO = 0.125f;

		// Styled dimensions.
		private final float mCornerRadius;
		private final float mOutlineWidth;
		private final float mShadowRadius;
		private final float mShadowOffsetX;
		private final float mShadowOffsetY;

		/** Temporary rectangle used for computing line bounds. */
		private final RectF mLineBounds = new RectF();

		/** Temporary array used for computing line wrapping. */
		private float[] mTextWidths;

		/** Reusable string builder used for holding text. */
		private final StringBuilder mText = new StringBuilder();
		private final StringBuilder mBreakText = new StringBuilder();

		private TextPaint mPaint;

		private int mForegroundColor;
		private int mBackgroundColor;
		private int mEdgeColor;
		private int mEdgeType;

		private boolean mHasMeasurements;
		private int mLastMeasuredWidth;
		private StaticLayout mLayout;

		private float mSpacingMult = 1;
		private float mSpacingAdd = 0;
		private int mInnerPaddingX = 0;

		public SubtitleView(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
		}

		public SubtitleView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs);

		final Theme theme = context.getTheme();
		final TypedArray a = theme.obtainStyledAttributes(
		attrs, android.R.styleable.TextView, defStyle, 0);

		CharSequence text = "";
		int textSize = 15;

		final int n = a.getIndexCount();
		for (int i = 0; i < n; i++) {
		int attr = a.getIndex(i);

		switch (attr) {
		case android.R.styleable.TextView_text:
		text = a.getText(attr);
		break;
		case android.R.styleable.TextView_lineSpacingExtra:
		mSpacingAdd = a.getDimensionPixelSize(attr, (int) mSpacingAdd);
		break;
		case android.R.styleable.TextView_lineSpacingMultiplier:
		mSpacingMult = a.getFloat(attr, mSpacingMult);
		break;
		case android.R.styleable.TextAppearance_textSize:
		textSize = a.getDimensionPixelSize(attr, textSize);
		break;
		}
		}

		// Set up density-dependent properties.
		// TODO: Move these to a default style.
		final Resources res = getContext().getResources();
		final DisplayMetrics m = res.getDisplayMetrics();
		mCornerRadius = res.getDimension(com.android.internal.R.dimen.subtitle_corner_radius);
		mOutlineWidth = res.getDimension(com.android.internal.R.dimen.subtitle_outline_width);
		mShadowRadius = res.getDimension(com.android.internal.R.dimen.subtitle_shadow_radius);
		mShadowOffsetX = res.getDimension(com.android.internal.R.dimen.subtitle_shadow_offset);
		mShadowOffsetY = mShadowOffsetX;

		final TextPaint paint = new TextPaint();
		paint.setAntiAlias(true);
		paint.setSubpixelText(true);

		mPaint = paint;

		setText(text);
		setTextSize(textSize);
		}

		public void setText(int resId) {
		final CharSequence text = getContext().getText(resId);
		setText(text);
		}

		public void setText(CharSequence text) {
		mText.setLength(0);
		mText.append(text);

		mHasMeasurements = false;

		requestLayout();
		}

		public void setForegroundColor(int color) {
		mForegroundColor = color;

		invalidate();
		}

		@Override
		public void setBackgroundColor(int color) {
		mBackgroundColor = color;

		invalidate();
		}

		public void setEdgeType(int edgeType) {
		mEdgeType = edgeType;

		invalidate();
		}

		public void setEdgeColor(int color) {
		mEdgeColor = color;

		invalidate();
		}

		public void setTextSize(float size) {
		final DisplayMetrics metrics = getContext().getResources().getDisplayMetrics();
		final float pixels = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, size, metrics);
		if (mPaint.getTextSize() != size) {
		mHasMeasurements = false;
		mInnerPaddingX = (int) (size * INNER_PADDING_RATIO + 0.5f);
		mPaint.setTextSize(size);

		requestLayout();
		}
		}

		public void setTypeface(Typeface typeface) {
		if (mPaint.getTypeface() != typeface) {
		mHasMeasurements = false;
		mPaint.setTypeface(typeface);

		requestLayout();
		}
		}

		@Override
		protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		final int widthSpec = MeasureSpec.getSize(widthMeasureSpec);

		if (computeMeasurements(widthSpec)) {
		final StaticLayout layout = mLayout;

		// Account for padding.
		final int paddingX = mPaddingLeft + mPaddingRight + mInnerPaddingX * 2;
		final int width = layout.getWidth() + paddingX;
		final int height = layout.getHeight() + mPaddingTop + mPaddingBottom;
		setMeasuredDimension(width, height);
		} else {
		setMeasuredDimension(MEASURED_STATE_TOO_SMALL, MEASURED_STATE_TOO_SMALL);
		}
		}

		@Override
		public void onLayout(boolean changed, int l, int t, int r, int b) {
		final int width = r - l;

		computeMeasurements(width);
		}

		private boolean computeMeasurements(int maxWidth) {
		if (mHasMeasurements && maxWidth == mLastMeasuredWidth) {
		return true;
		}

		// Account for padding.
		final int paddingX = mPaddingLeft + mPaddingRight + mInnerPaddingX;
		maxWidth -= paddingX;

		if (maxWidth <= 0) {
		return false;
		}

		final TextPaint paint = mPaint;
		final CharSequence text = mText;
		final int textLength = text.length();
		if (mTextWidths == null \|\| mTextWidths.length < textLength) {
		mTextWidths = new float[textLength];
		}

		final float[] textWidths = mTextWidths;
		paint.getTextWidths(text, 0, textLength, textWidths);

		// Compute total length.
		float runLength = 0;
		for (int i = 0; i < textLength; i++) {
		runLength += textWidths[i];
		}

		final int lineCount = (int) (runLength / maxWidth) + 1;
		final int lineLength = (int) (runLength / lineCount);

		// Build line break buffer.
		final StringBuilder breakText = mBreakText;
		breakText.setLength(0);

		int line = 0;
		int lastBreak = 0;
		int maxRunLength = 0;
		runLength = 0;
		for (int i = 0; i < textLength; i++) {
		if (runLength > lineLength) {
		final CharSequence sequence = text.subSequence(lastBreak, i);
		final int trimmedLength = TextUtils.getTrimmedLength(sequence);
		breakText.append(sequence, 0, trimmedLength);
		breakText.append('\n');
		lastBreak = i;
		runLength = 0;
		}

		runLength += textWidths[i];

		if (runLength > maxRunLength) {
		maxRunLength = (int) Math.ceil(runLength);
		}
		}
		breakText.append(text.subSequence(lastBreak, textLength));

		mHasMeasurements = true;
		mLastMeasuredWidth = maxWidth;

		mLayout = new StaticLayout(breakText, paint, maxRunLength, Alignment.ALIGN_LEFT,
		mSpacingMult, mSpacingAdd, true);

		return true;
		}

		public void setStyle(int styleId) {
		final Context context = mContext;
		final ContentResolver cr = context.getContentResolver();
		final CaptionStyle style;
		if (styleId == CaptionStyle.PRESET_CUSTOM) {
		style = CaptionStyle.getCustomStyle(cr);
		} else {
		style = CaptionStyle.PRESETS[styleId];
		}

		mForegroundColor = style.foregroundColor;
		mBackgroundColor = style.backgroundColor;
		mEdgeType = style.edgeType;
		mEdgeColor = style.edgeColor;
		mHasMeasurements = false;

		final Typeface typeface = style.getTypeface();
		setTypeface(typeface);

		requestLayout();
		}

		@Override
		protected void onDraw(Canvas c) {
		final StaticLayout layout = mLayout;
		if (layout == null) {
		return;
		}

		final int saveCount = c.save();
		final int innerPaddingX = mInnerPaddingX;
		c.translate(mPaddingLeft + innerPaddingX, mPaddingTop);

		final RectF bounds = mLineBounds;
		final int lineCount = layout.getLineCount();
		final Paint paint = layout.getPaint();
		paint.setShadowLayer(0, 0, 0, 0);

		final int backgroundColor = mBackgroundColor;
		if (Color.alpha(backgroundColor) > 0) {
		paint.setColor(backgroundColor);
		paint.setStyle(Style.FILL);

		final float cornerRadius = mCornerRadius;
		float previousBottom = layout.getLineTop(0);

		for (int i = 0; i < lineCount; i++) {
		bounds.left = layout.getLineLeft(i) - innerPaddingX;
		bounds.right = layout.getLineRight(i) + innerPaddingX;
		bounds.top = previousBottom;
		bounds.bottom = layout.getLineBottom(i);

		previousBottom = bounds.bottom;

		c.drawRoundRect(bounds, cornerRadius, cornerRadius, paint);
		}
		}

		final int edgeType = mEdgeType;
		if (edgeType == CaptionStyle.EDGE_TYPE_OUTLINE) {
		paint.setColor(mEdgeColor);
		paint.setStyle(Style.FILL_AND_STROKE);
		paint.setStrokeJoin(Join.ROUND);
		paint.setStrokeWidth(mOutlineWidth);

		for (int i = 0; i < lineCount; i++) {
		layout.drawText(c, i, i);
		}
		}

		if (edgeType == CaptionStyle.EDGE_TYPE_DROP_SHADOW) {
		paint.setShadowLayer(mShadowRadius, mShadowOffsetX, mShadowOffsetY, mEdgeColor);
		}

		paint.setColor(mForegroundColor);
		paint.setStyle(Style.FILL);

		for (int i = 0; i < lineCount; i++) {
		layout.drawText(c, i, i);
		}

		c.restoreToCount(saveCount);
		}
		}

core/res/res/values/dimens.xml

+12 −0

Original line number	Diff line number	Diff line
		@@ -344,4 +344,16 @@
		security mode. -->
		<dimen name="kg_small_widget_height">160dp</dimen>

		<!-- Rounded corner radius for video subtitles. -->
		<dimen name="subtitle_corner_radius">2dp</dimen>

		<!-- Shadow radius for video subtitles. -->
		<dimen name="subtitle_shadow_radius">2dp</dimen>

		<!-- Shadow offset for video subtitles. -->
		<dimen name="subtitle_shadow_offset">2dp</dimen>

		<!-- Outline width for video subtitles. -->
		<dimen name="subtitle_outline_width">2dp</dimen>

		</resources>

core/res/res/values/symbols.xml

+5 −0

Original line number	Diff line number	Diff line
		@@ -1661,4 +1661,9 @@
		<java-symbol type="attr" name="actionModeWebSearchDrawable" />
		<java-symbol type="string" name="websearch" />

		<!-- From SubtitleView -->
		<java-symbol type="dimen" name="subtitle_corner_radius" />
		<java-symbol type="dimen" name="subtitle_shadow_radius" />
		<java-symbol type="dimen" name="subtitle_shadow_offset" />
		<java-symbol type="dimen" name="subtitle_outline_width" />
		</resources>