Java Layout.getLineEnd方法代碼示例

import android.text.Layout; //導入方法依賴的package包/類
@Override
protected void onDraw(Canvas canvas) {
    TextPaint paint = getPaint();
    paint.setColor(getCurrentTextColor());
    paint.drawableState = getDrawableState();

    String text = getText().toString();

    float lineY = 0;
    lineY += getTextSize() * 1f;

    final Layout layout = getLayout();
    final float desiredLineWidth = getMeasuredWidth();

    for (int i = 0, lineCount = layout.getLineCount(); i < lineCount; i++) {
        int lineStart = layout.getLineStart(i);
        int lineEnd = layout.getLineEnd(i);
        String line = text.substring(lineStart, lineEnd);

        if (needScale(line) && i < lineCount - 1) {
            drawScaledText(line, canvas, lineY, desiredLineWidth, paint);
        } else {
            canvas.drawText(line, 0, lineY, paint);
        }

        lineY += getLineHeight();
    }
}
 

import android.text.Layout; //導入方法依賴的package包/類
/**
 * Find the number of lines of text which must be shown in order to display the character at
 * a given index.
 */
private int getLineForIndex(int index) {
    Layout layout = getLayout();
    int endLine = 0;
    while (endLine < layout.getLineCount() && layout.getLineEnd(endLine) < index) {
        endLine++;
    }
    // Since endLine is an index, add 1 to get the number of lines.
    return endLine + 1;
}
 

import android.text.Layout; //導入方法依賴的package包/類
/**
 * @return the line above current cursor
 */
@Nullable
private CharSequence getPrevLine(Editable editable, Layout layout, int currentLine) {
    if (currentLine - 1 < 0) return null;
    int lineStart = layout.getLineStart(currentLine - 1);
    int lineEnd = layout.getLineEnd(currentLine - 1);
    return editable.subSequence(lineStart, lineEnd);
}
 

import android.text.Layout; //導入方法依賴的package包/類
@Nullable
protected CharSequence getNextLine(Editable editable, Layout layout, int currentLine) {
    if (currentLine + 1 > layout.getLineCount() - 1) return null;
    int lineStart = layout.getLineStart(currentLine + 1);
    int lineEnd = layout.getLineEnd(currentLine + 1);
    return editable.subSequence(lineStart, lineEnd);
}
 

import android.text.Layout; //導入方法依賴的package包/類
/**
 * Gets the lineInfo from the index of the letter in the text
 */
public static int getLineFromIndex(int index, int lineCount, Layout layout) {
    int line;
    int currentIndex = 0;

    for (line = 0; line < lineCount; line++) {
        currentIndex += layout.getLineEnd(line) - layout.getLineStart(line);
        if (currentIndex > index) {
            break;
        }
    }
    return line;
}
 

import android.text.Layout; //導入方法依賴的package包/類
/**
 * move cursor to lineInfo
 *
 * @param line - lineInfo in editor, start at 0
 */
public void goToLine(int line) {
    Layout layout = getLayout();
    line = Math.min(line - 1, getLineCount() - 1);
    line = Math.max(0, line);
    if (layout != null) {
        int index = layout.getLineEnd(line);
        setSelection(index);
    }
}
 

import android.text.Layout; //導入方法依賴的package包/類
/**
 * Gets the lineInfo from the index of the letter in the text
 */
public static int getLineFromIndex(int index, int lineCount, Layout layout) {
    int line;
    int currentIndex = 0;

    for (line = 0; line < lineCount; line++) {
        currentIndex += layout.getLineEnd(line) - layout.getLineStart(line);
        if (currentIndex >= index) {
            break;
        }
    }
    return line;
}
 

import android.text.Layout; //導入方法依賴的package包/類
private void adjustEllipsizeEndText(Layout layout) {
    try {
        final CharSequence originText = getText();
        if(TextUtils.isEmpty(originText)){
            return;
        }
        final CharSequence restSuffixText = originText.subSequence(
                originText.length() - mEllipsizeIndex, originText.length());

        final int width = layout.getWidth() - getPaddingLeft() - getPaddingRight();
        final int maxLineCount = computeMaxLineCount(layout);
        final int lastLineWidth = (int) layout.getLineWidth(maxLineCount - 1);
        final int mLastCharacterIndex = layout.getLineEnd(maxLineCount - 1);

        final int suffixWidth = (int) (Layout.getDesiredWidth(mEllipsizeText, getPaint()) +
                Layout.getDesiredWidth(restSuffixText, getPaint())) + 1;

        if (lastLineWidth + suffixWidth > width) {
            final int widthDiff = lastLineWidth + suffixWidth - width;

            final int removedCharacterCount = computeRemovedEllipsizeEndCharacterCount(widthDiff,
                    originText.subSequence(0, mLastCharacterIndex));

            setText(originText.subSequence(0, mLastCharacterIndex - removedCharacterCount));
            append(mEllipsizeText);
            append(restSuffixText);
        } else {
            setText(originText.subSequence(0, mLastCharacterIndex));
            append(mEllipsizeText);
            append(restSuffixText);
        }
    }catch (IndexOutOfBoundsException e){

    }
}
 

import android.text.Layout; //導入方法依賴的package包/類
/**
 * Gets the line from the index of the letter in the text
 *
 * @param index
 * @param lineCount
 * @param layout
 * @return
 */
public static int getLineFromIndex(int index, int lineCount, Layout layout) {
    int line;
    int currentIndex = 0;

    for (line = 0; line < lineCount; line++) {
        currentIndex += layout.getLineEnd(line) - layout.getLineStart(line);
        if (currentIndex > index) {
            break;
        }
    }

    return line;
}
 

import android.text.Layout; //導入方法依賴的package包/類
/**
 * 重繪文字，兩端對齊
 *
 * @param canvas
 */
private void drawTextWithJustify(Canvas canvas) {
    // 文字畫筆
    TextPaint textPaint = getPaint();
    textPaint.setColor(getCurrentTextColor());
    textPaint.drawableState = getDrawableState();

    String text_str = getText().toString();
    // 當前所在行的Y向偏移
    int currentLineOffsetY = getPaddingTop();
    currentLineOffsetY += getTextSize();

    Layout layout = getLayout();

    //循環每一行,繪製文字
    for (int i = 0; i < layout.getLineCount(); i++) {
        int lineStart = layout.getLineStart(i);
        int lineEnd = layout.getLineEnd(i);
        //獲取到TextView每行中的內容
        String line_str = text_str.substring(lineStart, lineEnd);
        // 獲取每行字符串的寬度(不包括字符間距)
        float desiredWidth = StaticLayout.getDesiredWidth(text_str, lineStart, lineEnd, getPaint());

        if (isLineNeedJustify(line_str)) {
            //最後一行不需要重繪
            if (i == layout.getLineCount() - 1) {
                canvas.drawText(line_str, getPaddingLeft(), currentLineOffsetY, textPaint);
            } else {
                drawJustifyTextForLine(canvas, line_str, desiredWidth, currentLineOffsetY);
            }
        } else {
            canvas.drawText(line_str, getPaddingLeft(), currentLineOffsetY, textPaint);
        }
        //更新行Y向偏移
        currentLineOffsetY += getLineHeight();
    }
}
 

import android.text.Layout; //導入方法依賴的package包/類
/**
 * 計算字符距離控件左側的位移
 *
 * @param line       字符所在行
 * @param charOffset 字符偏移量
 */
private float calculatorCharPositionToLeft(int line, int charOffset) {

    String text_str = getText().toString();


    Layout layout = getLayout();
    int lineStart = layout.getLineStart(line);
    int lineEnd = layout.getLineEnd(line);

    String line_str = text_str.substring(lineStart, lineEnd);

    if (line_str.equals("\n"))
        return getPaddingLeft();
    // 最左側
    if (lineStart == charOffset)
        return getPaddingLeft();
    // 最右側
    if (charOffset == lineEnd - 1)
        return mViewTextWidth + getPaddingLeft();

    float desiredWidth = StaticLayout.getDesiredWidth(text_str, lineStart, lineEnd, getPaint());

    // 中間位置
    // 計算相鄰字符之間需要填充的寬度
    // (TextView內容的實際寬度 - 該行字符串的寬度)/（字符個數-1）
    float insert_blank = (mViewTextWidth - desiredWidth) / (line_str.length() - 1);
    // 計算當前字符左側所有字符的寬度
    float allLeftCharWidth = StaticLayout.getDesiredWidth(text_str.substring(lineStart, charOffset), getPaint());

    // 相鄰字符之間需要填充的寬度 + 當前字符左側所有字符的寬度
    return insert_blank * (charOffset - lineStart) + allLeftCharWidth + getPaddingLeft();

}
 

import android.text.Layout; //導入方法依賴的package包/類
public void updateHasNewLineArray(int lineCount, Layout layout, String text) {
    boolean[] hasNewLineArray = new boolean[lineCount];
    toCountLinesArray = new boolean[lineCount];
    realLines = new int[lineCount];
    if (TextUtils.isEmpty(text)) {
        toCountLinesArray[0] = false;
        realLines[0] = 0;
        return;
    }

    if (lineCount == 0) return;

    int i;

    // for every lineInfo on the edittext
    for (i = 0; i < lineCount; i++) {
        // check if this lineInfo contains "\n"
        if (layout.getLineEnd(i) == 0) {
            hasNewLineArray[i] = false;
        } else {
            hasNewLineArray[i] = text.charAt(layout.getLineEnd(i) - 1) == '\n';
        }
        // if true
        if (hasNewLineArray[i]) {
            int j = i - 1;
            while (j >= 0 && !hasNewLineArray[j]) {
                j--;
            }
            toCountLinesArray[j + 1] = true;

        }
    }

    toCountLinesArray[lineCount - 1] = true;

    int realLine = 0;
    for (i = 0; i < toCountLinesArray.length; i++) {
        realLines[i] = realLine;
        if (toCountLinesArray[i]) {
            realLine++;
        }
    }
}
 

import android.text.Layout; //導入方法依賴的package包/類
private boolean action(int what, TextView widget, Spannable buffer) {
    Layout layout = widget.getLayout();
    int padding = widget.getTotalPaddingTop() + widget.getTotalPaddingBottom();
    int areatop = widget.getScrollY();
    int areabot = (widget.getHeight() + areatop) - padding;
    int linetop = layout.getLineForVertical(areatop);
    int linebot = layout.getLineForVertical(areabot);
    int first = layout.getLineStart(linetop);
    int last = layout.getLineEnd(linebot);
    MyURLSpan[] candidates = (MyURLSpan[]) buffer.getSpans(first, last, MyURLSpan.class);
    int a = Selection.getSelectionStart(buffer);
    int b = Selection.getSelectionEnd(buffer);
    int selStart = Math.min(a, b);
    int selEnd = Math.max(a, b);
    if (selStart < 0 && buffer.getSpanStart(FROM_BELOW) >= 0) {
        selEnd = buffer.length();
        selStart = selEnd;
    }
    if (selStart > last) {
        selEnd = ActivityChooserViewAdapter.MAX_ACTIVITY_COUNT_UNLIMITED;
        selStart = ActivityChooserViewAdapter.MAX_ACTIVITY_COUNT_UNLIMITED;
    }
    if (selEnd < first) {
        selEnd = -1;
        selStart = -1;
    }
    int beststart;
    int bestend;
    int i;
    switch (what) {
        case 1:
            if (selStart != selEnd) {
                MyURLSpan[] link = (MyURLSpan[]) buffer.getSpans(selStart, selEnd, MyURLSpan
                        .class);
                if (link.length == 1) {
                    link[0].onClick(widget);
                    break;
                }
                return false;
            }
            return false;
        case 2:
            beststart = -1;
            bestend = -1;
            for (i = 0; i < candidates.length; i++) {
                int end = buffer.getSpanEnd(candidates[i]);
                if ((end < selEnd || selStart == selEnd) && end > bestend) {
                    beststart = buffer.getSpanStart(candidates[i]);
                    bestend = end;
                }
            }
            if (beststart >= 0) {
                Selection.setSelection(buffer, bestend, beststart);
                return true;
            }
            break;
        case 3:
            beststart = ActivityChooserViewAdapter.MAX_ACTIVITY_COUNT_UNLIMITED;
            bestend = ActivityChooserViewAdapter.MAX_ACTIVITY_COUNT_UNLIMITED;
            for (i = 0; i < candidates.length; i++) {
                int start = buffer.getSpanStart(candidates[i]);
                if ((start > selStart || selStart == selEnd) && start < beststart) {
                    beststart = start;
                    bestend = buffer.getSpanEnd(candidates[i]);
                }
            }
            if (bestend < Integer.MAX_VALUE) {
                Selection.setSelection(buffer, beststart, bestend);
                return true;
            }
            break;
    }
    return false;
}