Add default implementation for LineBackgroundSpan (003f7371) · Commits · e / os / android_frameworks_base

api/current.txt

+10 −0

Original line number	Diff line number	Diff line
		@@ -44894,6 +44894,16 @@ package android.text.style {
		method public abstract void drawBackground(android.graphics.Canvas, android.graphics.Paint, int, int, int, int, int, java.lang.CharSequence, int, int, int);
		}

		public static class LineBackgroundSpan.Standard implements android.text.style.LineBackgroundSpan android.text.ParcelableSpan {
		ctor public LineBackgroundSpan.Standard(int);
		ctor public LineBackgroundSpan.Standard(android.os.Parcel);
		method public int describeContents();
		method public void drawBackground(android.graphics.Canvas, android.graphics.Paint, int, int, int, int, int, java.lang.CharSequence, int, int, int);
		method public final int getColor();
		method public int getSpanTypeId();
		method public void writeToParcel(android.os.Parcel, int);
		}

		public abstract interface LineHeightSpan implements android.text.style.ParagraphStyle android.text.style.WrapTogetherSpan {
		method public abstract void chooseHeight(java.lang.CharSequence, int, int, int, int, android.graphics.Paint.FontMetricsInt);
		}

core/java/android/text/TextUtils.java

+8 −1

Original line number	Diff line number	Diff line
		@@ -42,6 +42,7 @@ import android.text.style.CharacterStyle;
		import android.text.style.EasyEditSpan;
		import android.text.style.ForegroundColorSpan;
		import android.text.style.LeadingMarginSpan;
		import android.text.style.LineBackgroundSpan;
		import android.text.style.LocaleSpan;
		import android.text.style.ParagraphStyle;
		import android.text.style.QuoteSpan;
		@@ -687,7 +688,9 @@ public class TextUtils {
		/** @hide */
		public static final int ACCESSIBILITY_URL_SPAN = 26;
		/** @hide */
		public static final int LAST_SPAN = ACCESSIBILITY_URL_SPAN;
		public static final int LINE_BACKGROUND_SPAN = 27;
		/** @hide */
		public static final int LAST_SPAN = LINE_BACKGROUND_SPAN;

		/**
		* Flatten a CharSequence and whatever styles can be copied across processes
		@@ -878,6 +881,10 @@ public class TextUtils {
		readSpan(p, sp, new AccessibilityURLSpan(p));
		break;

		case LINE_BACKGROUND_SPAN:
		readSpan(p, sp, new LineBackgroundSpan.Standard(p));
		break;

		default:
		throw new RuntimeException("bogus span encoding " + kind);
		}

core/java/android/text/style/LineBackgroundSpan.java

+102 −7

Original line number	Diff line number	Diff line
		@@ -16,15 +16,110 @@

		package android.text.style;

		import android.annotation.ColorInt;
		import android.annotation.NonNull;
		import android.annotation.Px;
		import android.graphics.Canvas;
		import android.graphics.Paint;
		import android.os.Parcel;
		import android.text.ParcelableSpan;
		import android.text.TextUtils;

		public interface LineBackgroundSpan
		extends ParagraphStyle
		/**
		* Used to change the background of lines where the span is attached to.
		*/
		public interface LineBackgroundSpan extends ParagraphStyle
		{
		public void drawBackground(Canvas c, Paint p,
		int left, int right,
		int top, int baseline, int bottom,
		CharSequence text, int start, int end,
		int lnum);
		/**
		* Draw the background on the canvas.
		*
		* @param canvas canvas on which the span should be rendered
		* @param paint paint used to draw text, which should be left unchanged on exit
		* @param left left position of the line relative to input canvas, in pixels
		* @param right right position of the line relative to input canvas, in pixels
		* @param top top position of the line relative to input canvas, in pixels
		* @param baseline baseline of the text relative to input canvas, in pixels
		* @param bottom bottom position of the line relative to input canvas, in pixels
		* @param text current text
		* @param start start character index of the line
		* @param end end character index of the line
		* @param lineNumber line number in the current text layout
		*/
		void drawBackground(@NonNull Canvas canvas, @NonNull Paint paint,
		@Px int left, @Px int right,
		@Px int top, @Px int baseline, @Px int bottom,
		@NonNull CharSequence text, int start, int end,
		int lineNumber);
		/**
		* Default implementation of the {@link LineBackgroundSpan}, which changes the background
		* color of the lines to which the span is attached.
		*/
		class Standard implements LineBackgroundSpan, ParcelableSpan {

		private final int mColor;

		/**
		* Constructor taking a color integer.
		*
		* @param color Color integer that defines the background color.
		*/
		public Standard(@ColorInt int color) {
		mColor = color;
		}

		/**
		* Creates a {@link LineBackgroundSpan.Standard} from a parcel
		*/
		public Standard(@NonNull Parcel src) {
		mColor = src.readInt();
		}

		@Override
		public int getSpanTypeId() {
		return getSpanTypeIdInternal();
		}

		/** @hide */
		@Override
		public int getSpanTypeIdInternal() {
		return TextUtils.LINE_BACKGROUND_SPAN;
		}

		@Override
		public int describeContents() {
		return 0;
		}

		@Override
		public void writeToParcel(@NonNull Parcel dest, int flags) {
		writeToParcelInternal(dest, flags);
		}

		/** @hide */
		@Override
		public void writeToParcelInternal(@NonNull Parcel dest, int flags) {
		dest.writeInt(mColor);
		}

		/**
		* @return the color of this span.
		* @see Standard#Standard(int)
		*/
		@ColorInt
		public final int getColor() {
		return mColor;
		}

		@Override
		public void drawBackground(@NonNull Canvas canvas, @NonNull Paint paint,
		@Px int left, @Px int right,
		@Px int top, @Px int baseline, @Px int bottom,
		@NonNull CharSequence text, int start, int end,
		int lineNumber) {
		final int originColor = paint.getColor();
		paint.setColor(mColor);
		canvas.drawRect(left, right, top, bottom, paint);
		paint.setColor(originColor);
		}
		}
		}