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Android Reference

Layout


android.text

Class Layout

    • Nested Class Summary

      Nested Classes
      Modifier and Type Class and Description
      static class Layout.Alignment
      static class Layout.Directions
      Stores information about bidirectional (left-to-right or right-to-left) text within the layout of a line.
    • Constructor Summary

      Constructors
      Modifier Constructor and Description
      protected Layout(CharSequence text, TextPaint paint, int width, Layout.Alignment align, float spacingMult, float spacingAdd)
      Subclasses of Layout use this constructor to set the display text, width, and other standard properties.
      protected Layout(CharSequence text, TextPaint paint, int width, Layout.Alignment align, TextDirectionHeuristic textDir, float spacingMult, float spacingAdd)
      Subclasses of Layout use this constructor to set the display text, width, and other standard properties.
    • Method Summary

      Methods
      Modifier and Type Method and Description
      void draw(Canvas c)
      Draw this Layout on the specified Canvas.
      void draw(Canvas canvas, Path highlight, Paint highlightPaint, int cursorOffsetVertical)
      Draw this Layout on the specified canvas, with the highlight path drawn between the background and the text.
      void drawBackground(Canvas canvas, Path highlight, Paint highlightPaint, int cursorOffsetVertical, int firstLine, int lastLine)
      void drawText(Canvas canvas, int firstLine, int lastLine)
      Layout.Alignment getAlignment()
      Return the base alignment of this layout.
      abstract int getBottomPadding()
      Returns the number of extra pixels of descent padding in the bottom line of the Layout.
      void getCursorPath(int point, Path dest, CharSequence editingBuffer)
      Fills in the specified Path with a representation of a cursor at the specified offset.
      static float getDesiredWidth(CharSequence source, int start, int end, TextPaint paint)
      Return how wide a layout must be in order to display the specified text slice with one line per paragraph.
      static float getDesiredWidth(CharSequence source, TextPaint paint)
      Return how wide a layout must be in order to display the specified text with one line per paragraph.
      abstract int getEllipsisCount(int line)
      Returns the number of characters to be ellipsized away, or 0 if no ellipsis is to take place.
      abstract int getEllipsisStart(int line)
      Return the offset of the first character to be ellipsized away, relative to the start of the line.
      int getEllipsizedWidth()
      Return the width to which this Layout is ellipsizing, or getWidth() if it is not doing anything special.
      int getHeight()
      Return the total height of this layout.
      int getLineAscent(int line)
      Get the ascent of the text on the specified line.
      int getLineBaseline(int line)
      Return the vertical position of the baseline of the specified line.
      int getLineBottom(int line)
      Return the vertical position of the bottom of the specified line.
      int getLineBounds(int line, Rect bounds)
      Return the baseline for the specified line (0…getLineCount() - 1) If bounds is not null, return the top, left, right, bottom extents of the specified line in it.
      abstract boolean getLineContainsTab(int line)
      Returns whether the specified line contains one or more characters that need to be handled specially, like tabs or emoji.
      abstract int getLineCount()
      Return the number of lines of text in this layout.
      abstract int getLineDescent(int line)
      Return the descent of the specified line(0…getLineCount() - 1).
      abstract Layout.Directions getLineDirections(int line)
      Returns the directional run information for the specified line.
      int getLineEnd(int line)
      Return the text offset after the last character on the specified line.
      int getLineForOffset(int offset)
      Get the line number on which the specified text offset appears.
      int getLineForVertical(int vertical)
      Get the line number corresponding to the specified vertical position.
      float getLineLeft(int line)
      Get the leftmost position that should be exposed for horizontal scrolling on the specified line.
      float getLineMax(int line)
      Gets the unsigned horizontal extent of the specified line, including leading margin indent, but excluding trailing whitespace.
      long getLineRangeForDraw(Canvas canvas)
      float getLineRight(int line)
      Get the rightmost position that should be exposed for horizontal scrolling on the specified line.
      abstract int getLineStart(int line)
      Return the text offset of the beginning of the specified line ( 0…getLineCount()).
      abstract int getLineTop(int line)
      Return the vertical position of the top of the specified line (0…getLineCount()).
      int getLineVisibleEnd(int line)
      Return the text offset after the last visible character (so whitespace is not counted) on the specified line.
      float getLineWidth(int line)
      Gets the unsigned horizontal extent of the specified line, including leading margin indent and trailing whitespace.
      int getOffsetForHorizontal(int line, float horiz)
      Get the character offset on the specified line whose position is closest to the specified horizontal position.
      int getOffsetToLeftOf(int offset)
      int getOffsetToRightOf(int offset)
      TextPaint getPaint()
      Return the base Paint properties for this layout.
      Layout.Alignment getParagraphAlignment(int line)
      Get the alignment of the specified paragraph, taking into account markup attached to it.
      abstract int getParagraphDirection(int line)
      Returns the primary directionality of the paragraph containing the specified line, either 1 for left-to-right lines, or -1 for right-to-left lines (see DIR_LEFT_TO_RIGHT, DIR_RIGHT_TO_LEFT).
      int getParagraphLeft(int line)
      Get the left edge of the specified paragraph, inset by left margins.
      int getParagraphRight(int line)
      Get the right edge of the specified paragraph, inset by right margins.
      float getPrimaryHorizontal(int offset)
      Get the primary horizontal position for the specified text offset.
      float getSecondaryHorizontal(int offset)
      Get the secondary horizontal position for the specified text offset.
      void getSelectionPath(int start, int end, Path dest)
      Fills in the specified Path with a representation of a highlight between the specified offsets.
      float getSpacingAdd()
      Return the number of units of leading that are added to each line.
      float getSpacingMultiplier()
      Return what the text height is multiplied by to get the line height.
      CharSequence getText()
      Return the text that is displayed by this Layout.
      TextDirectionHeuristic getTextDirectionHeuristic()
      Return the heuristic used to determine paragraph text direction.
      abstract int getTopPadding()
      Returns the (negative) number of extra pixels of ascent padding in the top line of the Layout.
      int getWidth()
      Return the width of this layout.
      void increaseWidthTo(int wid)
      Increase the width of this layout to the specified width.
      boolean isLevelBoundary(int offset)
      Returns true if the character at offset and the preceding character are at different run levels (and thus there's a split caret).
      boolean isRtlCharAt(int offset)
      Returns true if the character at offset is right to left (RTL).
      protected boolean isSpanned()
    • Constructor Detail

      • Layout

        protected Layout(CharSequence text,
              TextPaint paint,
              int width,
              Layout.Alignment align,
              float spacingMult,
              float spacingAdd)
        Subclasses of Layout use this constructor to set the display text, width, and other standard properties.
        Parameters:
        text - the text to render
        paint - the default paint for the layout. Styles can override various attributes of the paint.
        width - the wrapping width for the text.
        align - whether to left, right, or center the text. Styles can override the alignment.
        spacingMult - factor by which to scale the font size to get the default line spacing
        spacingAdd - amount to add to the default line spacing
      • Layout

        protected Layout(CharSequence text,
              TextPaint paint,
              int width,
              Layout.Alignment align,
              TextDirectionHeuristic textDir,
              float spacingMult,
              float spacingAdd)
        Subclasses of Layout use this constructor to set the display text, width, and other standard properties.
        Parameters:
        text - the text to render
        paint - the default paint for the layout. Styles can override various attributes of the paint.
        width - the wrapping width for the text.
        align - whether to left, right, or center the text. Styles can override the alignment.
        spacingMult - factor by which to scale the font size to get the default line spacing
        spacingAdd - amount to add to the default line spacing
    • Method Detail

      • getDesiredWidth

        public static float getDesiredWidth(CharSequence source,
                            TextPaint paint)
        Return how wide a layout must be in order to display the specified text with one line per paragraph.
      • getDesiredWidth

        public static float getDesiredWidth(CharSequence source,
                            int start,
                            int end,
                            TextPaint paint)
        Return how wide a layout must be in order to display the specified text slice with one line per paragraph.
      • draw

        public void draw(Canvas c)
        Draw this Layout on the specified Canvas.
      • draw

        public void draw(Canvas canvas,
                Path highlight,
                Paint highlightPaint,
                int cursorOffsetVertical)
        Draw this Layout on the specified canvas, with the highlight path drawn between the background and the text.
        Parameters:
        canvas - the canvas
        highlight - the path of the highlight or cursor; can be null
        highlightPaint - the paint for the highlight
        cursorOffsetVertical - the amount to temporarily translate the canvas while rendering the highlight
      • drawText

        public void drawText(Canvas canvas,
                    int firstLine,
                    int lastLine)
      • drawBackground

        public void drawBackground(Canvas canvas,
                          Path highlight,
                          Paint highlightPaint,
                          int cursorOffsetVertical,
                          int firstLine,
                          int lastLine)
      • getLineRangeForDraw

        public long getLineRangeForDraw(Canvas canvas)
        Parameters:
        canvas -
        Returns:
        The range of lines that need to be drawn, possibly empty.
      • getText

        public final CharSequence getText()
        Return the text that is displayed by this Layout.
      • getPaint

        public final TextPaint getPaint()
        Return the base Paint properties for this layout. Do NOT change the paint, which may result in funny drawing for this layout.
      • getWidth

        public final int getWidth()
        Return the width of this layout.
      • getEllipsizedWidth

        public int getEllipsizedWidth()
        Return the width to which this Layout is ellipsizing, or getWidth() if it is not doing anything special.
      • increaseWidthTo

        public final void increaseWidthTo(int wid)
        Increase the width of this layout to the specified width. Be careful to use this only when you know it is appropriate— it does not cause the text to reflow to use the full new width.
      • getHeight

        public int getHeight()
        Return the total height of this layout.
      • getAlignment

        public final Layout.Alignment getAlignment()
        Return the base alignment of this layout.
      • getSpacingMultiplier

        public final float getSpacingMultiplier()
        Return what the text height is multiplied by to get the line height.
      • getSpacingAdd

        public final float getSpacingAdd()
        Return the number of units of leading that are added to each line.
      • getTextDirectionHeuristic

        public final TextDirectionHeuristic getTextDirectionHeuristic()
        Return the heuristic used to determine paragraph text direction.
      • getLineCount

        public abstract int getLineCount()
        Return the number of lines of text in this layout.
      • getLineBounds

        public int getLineBounds(int line,
                        Rect bounds)
        Return the baseline for the specified line (0…getLineCount() - 1) If bounds is not null, return the top, left, right, bottom extents of the specified line in it.
        Parameters:
        line - which line to examine (0..getLineCount() - 1)
        bounds - Optional. If not null, it returns the extent of the line
        Returns:
        the Y-coordinate of the baseline
      • getLineTop

        public abstract int getLineTop(int line)
        Return the vertical position of the top of the specified line (0…getLineCount()). If the specified line is equal to the line count, returns the bottom of the last line.
      • getLineDescent

        public abstract int getLineDescent(int line)
        Return the descent of the specified line(0…getLineCount() - 1).
      • getLineStart

        public abstract int getLineStart(int line)
        Return the text offset of the beginning of the specified line ( 0…getLineCount()). If the specified line is equal to the line count, returns the length of the text.
      • getParagraphDirection

        public abstract int getParagraphDirection(int line)
        Returns the primary directionality of the paragraph containing the specified line, either 1 for left-to-right lines, or -1 for right-to-left lines (see DIR_LEFT_TO_RIGHT, DIR_RIGHT_TO_LEFT).
      • getLineContainsTab

        public abstract boolean getLineContainsTab(int line)
        Returns whether the specified line contains one or more characters that need to be handled specially, like tabs or emoji.
      • getLineDirections

        public abstract Layout.Directions getLineDirections(int line)
        Returns the directional run information for the specified line. The array alternates counts of characters in left-to-right and right-to-left segments of the line.

        NOTE: this is inadequate to support bidirectional text, and will change.

      • getTopPadding

        public abstract int getTopPadding()
        Returns the (negative) number of extra pixels of ascent padding in the top line of the Layout.
      • getBottomPadding

        public abstract int getBottomPadding()
        Returns the number of extra pixels of descent padding in the bottom line of the Layout.
      • isLevelBoundary

        public boolean isLevelBoundary(int offset)
        Returns true if the character at offset and the preceding character are at different run levels (and thus there's a split caret).
        Parameters:
        offset - the offset
        Returns:
        true if at a level boundary
      • isRtlCharAt

        public boolean isRtlCharAt(int offset)
        Returns true if the character at offset is right to left (RTL).
        Parameters:
        offset - the offset
        Returns:
        true if the character is RTL, false if it is LTR
      • getPrimaryHorizontal

        public float getPrimaryHorizontal(int offset)
        Get the primary horizontal position for the specified text offset. This is the location where a new character would be inserted in the paragraph's primary direction.
      • getSecondaryHorizontal

        public float getSecondaryHorizontal(int offset)
        Get the secondary horizontal position for the specified text offset. This is the location where a new character would be inserted in the direction other than the paragraph's primary direction.
      • getLineLeft

        public float getLineLeft(int line)
        Get the leftmost position that should be exposed for horizontal scrolling on the specified line.
      • getLineRight

        public float getLineRight(int line)
        Get the rightmost position that should be exposed for horizontal scrolling on the specified line.
      • getLineMax

        public float getLineMax(int line)
        Gets the unsigned horizontal extent of the specified line, including leading margin indent, but excluding trailing whitespace.
      • getLineWidth

        public float getLineWidth(int line)
        Gets the unsigned horizontal extent of the specified line, including leading margin indent and trailing whitespace.
      • getLineForVertical

        public int getLineForVertical(int vertical)
        Get the line number corresponding to the specified vertical position. If you ask for a position above 0, you get 0; if you ask for a position below the bottom of the text, you get the last line.
      • getLineForOffset

        public int getLineForOffset(int offset)
        Get the line number on which the specified text offset appears. If you ask for a position before 0, you get 0; if you ask for a position beyond the end of the text, you get the last line.
      • getOffsetForHorizontal

        public int getOffsetForHorizontal(int line,
                                 float horiz)
        Get the character offset on the specified line whose position is closest to the specified horizontal position.
      • getLineEnd

        public final int getLineEnd(int line)
        Return the text offset after the last character on the specified line.
      • getLineVisibleEnd

        public int getLineVisibleEnd(int line)
        Return the text offset after the last visible character (so whitespace is not counted) on the specified line.
      • getLineBottom

        public final int getLineBottom(int line)
        Return the vertical position of the bottom of the specified line.
      • getLineBaseline

        public final int getLineBaseline(int line)
        Return the vertical position of the baseline of the specified line.
      • getLineAscent

        public final int getLineAscent(int line)
        Get the ascent of the text on the specified line. The return value is negative to match the Paint.ascent() convention.
      • getOffsetToLeftOf

        public int getOffsetToLeftOf(int offset)
      • getOffsetToRightOf

        public int getOffsetToRightOf(int offset)
      • getCursorPath

        public void getCursorPath(int point,
                         Path dest,
                         CharSequence editingBuffer)
        Fills in the specified Path with a representation of a cursor at the specified offset. This will often be a vertical line but can be multiple discontinuous lines in text with multiple directionalities.
      • getSelectionPath

        public void getSelectionPath(int start,
                            int end,
                            Path dest)
        Fills in the specified Path with a representation of a highlight between the specified offsets. This will often be a rectangle or a potentially discontinuous set of rectangles. If the start and end are the same, the returned path is empty.
      • getParagraphAlignment

        public final Layout.Alignment getParagraphAlignment(int line)
        Get the alignment of the specified paragraph, taking into account markup attached to it.
      • getParagraphLeft

        public final int getParagraphLeft(int line)
        Get the left edge of the specified paragraph, inset by left margins.
      • getParagraphRight

        public final int getParagraphRight(int line)
        Get the right edge of the specified paragraph, inset by right margins.
      • isSpanned

        protected final boolean isSpanned()
      • getEllipsisStart

        public abstract int getEllipsisStart(int line)
        Return the offset of the first character to be ellipsized away, relative to the start of the line. (So 0 if the beginning of the line is ellipsized, not getLineStart().)
      • getEllipsisCount

        public abstract int getEllipsisCount(int line)
        Returns the number of characters to be ellipsized away, or 0 if no ellipsis is to take place.


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