Java Code Examples for android.text.StaticLayout#getDesiredWidth()

private void drawScaledText(Canvas canvas, String line, float lineWidth, TextPaint paint, float top) {
    float x = mMarginLeft;

    if (isFirstLineOfParagraph(line)) {
        canvas.drawText(indent, x, top, paint);
        float bw = StaticLayout.getDesiredWidth(indent, paint);
        x += bw;
        line = line.substring(readBookControl.getIndent());
    }
    int gapCount = line.length() - 1;
    int i = 0;
    float d = ((mDisplayWidth - (mMarginLeft + mMarginRight)) - lineWidth) / gapCount;
    for (; i < line.length(); i++) {
        String c = String.valueOf(line.charAt(i));
        float cw = StaticLayout.getDesiredWidth(c, paint);
        canvas.drawText(c, x, top, paint);
        x += cw + d;
    }

}
 

private void drawScaledText(Canvas canvas, String line, float lineWidth, TextPaint paint, float top) {
    float x = mMarginLeft;
    if (isFirstLineOfParagraph(line)) {
        String blanks = StringUtils.halfToFull("  ");
        canvas.drawText(blanks, x, top, paint);
        float bw = StaticLayout.getDesiredWidth(blanks, paint);
        x += bw;
        line = line.substring(2);
    }

    final int lineLength = line.length();
    final int gapCount = lineLength - 1;
    final float d = ((mDisplayWidth - (mMarginLeft + mMarginRight)) - lineWidth) / gapCount;
    for (int i = 0; i < lineLength; i++) {
        String c = String.valueOf(line.charAt(i));
        float cw = StaticLayout.getDesiredWidth(c, paint);
        canvas.drawText(c, x, top, paint);
        x += cw + d;
    }
}
 

@Override
protected void onDraw(Canvas canvas) {
    TextPaint paint = getPaint();
    paint.setColor(getCurrentTextColor());
    paint.drawableState = getDrawableState();
    mViewWidth = getMeasuredWidth();
    String text = (String) getText();
    mLineY = 0;
    mLineY += getTextSize();
    Layout layout = getLayout();
    for (int i = 0; i < layout.getLineCount(); i++) {
        int lineStart = layout.getLineStart(i);
        int lineEnd = layout.getLineEnd(i);
        String line = text.substring(lineStart, lineEnd);

        float width = StaticLayout.getDesiredWidth(text, lineStart, lineEnd, getPaint());
        if (needScale(line)) {
            drawScaledText(canvas, lineStart, line, width);
        } else {
            canvas.drawText(line, 0, mLineY, paint);
        }

        mLineY += getLineHeight();
    }
}
 

private void drawScaledText(Canvas canvas, int lineStart, String line, float lineWidth) {
    float x = 0;
    if (isFirstLineOfParagraph(lineStart, line)) {
        String blanks = "  ";
        canvas.drawText(blanks, x, mLineY, getPaint());
        float bw = StaticLayout.getDesiredWidth(blanks, getPaint());
        x += bw;

        line = line.substring(3);
    }

    float d = (mViewWidth - lineWidth) / line.length() - 1;
    for (int i = 0; i < line.length(); i++) {
        String c = String.valueOf(line.charAt(i));
        float cw = StaticLayout.getDesiredWidth(c, getPaint());
        canvas.drawText(c, x, mLineY, getPaint());
        x += cw + d;
    }
}
 

private void drawScaledText(Canvas canvas, String line, float lineWidth, TextPaint paint, float top,int y,List<TxtLine> txtLists) {
    float x = mMarginLeft;

    if (isFirstLineOfParagraph(line)) {
        canvas.drawText(indent, x, top, paint);
        float bw = StaticLayout.getDesiredWidth(indent, paint);
        x += bw;
        line = line.substring(readBookControl.getIndent());
    }
    int gapCount = line.length() - 1;
    int i = 0;

    TxtLine txtList = new TxtLine();//每一行pzl
    txtList.CharsData = new ArrayList<TxtChar>();//pzl

    float d = ((mDisplayWidth - (mMarginLeft + mMarginRight)) - lineWidth) / gapCount;
    for (; i < line.length(); i++) {
        String c = String.valueOf(line.charAt(i));
        float cw = StaticLayout.getDesiredWidth(c, paint);
        canvas.drawText(c, x, top, paint);
        //pzl
        TxtChar txtChar = new TxtChar();
        txtChar.chardata = line.charAt(i);
        if(i==0) txtChar.charWidth = cw + d/2;
        if(i==gapCount) txtChar.charWidth = cw + d/2;
        txtChar.charWidth = cw + d;
        ;//字宽
        //txtChar.Index = y;//每页每个字的位置
        txtList.CharsData.add(txtChar);
        //pzl
        x += cw + d;
    }
    txtLists.set(y, txtList);//pzl

}
 

private void drawScaledText(Canvas canvas, String line, float lineWidth, TextPaint paint, float top, int y, List<TxtLine> txtLists) {
    float x = mMarginLeft;

    if (isFirstLineOfParagraph(line)) {
        canvas.drawText(indent, x, top, paint);
        float bw = StaticLayout.getDesiredWidth(indent, paint);
        x += bw;
        line = line.substring(readBookControl.getIndent());
    }
    int gapCount = line.length() - 1;
    int i = 0;

    TxtLine txtList = new TxtLine();//每一行pzl
    txtList.setCharsData(new ArrayList<>());//pzl

    float d = ((mDisplayWidth - (mMarginLeft + mMarginRight)) - lineWidth) / gapCount;
    for (; i < line.length(); i++) {
        String c = String.valueOf(line.charAt(i));
        float cw = StaticLayout.getDesiredWidth(c, paint);
        canvas.drawText(c, x, top, paint);
        //pzl
        TxtChar txtChar = new TxtChar();
        txtChar.setChardata(line.charAt(i));
        if (i == 0) txtChar.setCharWidth(cw + d / 2);
        if (i == gapCount) txtChar.setCharWidth(cw + d / 2);
        txtChar.setCharWidth(cw + d);
        ;//字宽
        //txtChar.Index = y;//每页每个字的位置
        txtList.getCharsData().add(txtChar);
        //pzl
        x += cw + d;
    }
    if (txtLists != null) {
        txtLists.set(y, txtList);//pzl
    }
}
 

private void drawUnitText(Canvas c) {
    if (null != mUnitText && !TextUtils.isEmpty(mUnitText)) {
        mUnitTextPaint.setColor(mUnitColor);
        mUnitTextPaint.setTextSize(mUnitSize);
        float startX = getWidth() - getPaddingRight() - StaticLayout.getDesiredWidth(mUnitText, 0, mUnitText.length(), mUnitTextPaint);
        Paint.FontMetrics fontMetrics = mUnitTextPaint.getFontMetrics();
        float startY = getVerticalSpace() / 2 + mUnitSize / 2 - fontMetrics.descent / 2;
        c.drawText(mUnitText, startX, startY, mUnitTextPaint);
    }
}
 

private void drawScaledText(final String line, final Canvas canvas, final float y, final float desiredLineWidth, final TextPaint paint) {
    String[] words = line.split(" ");

    float lineWidthWithoutSpaces = StaticLayout.getDesiredWidth(line.replace(" ", ""), getPaint());
    float spacing = (desiredLineWidth - lineWidthWithoutSpaces) / (words.length - 1);

    float x = 0;
    for (String word : words) {
        float cw = StaticLayout.getDesiredWidth(word, paint);
        canvas.drawText(word, x, y, paint);
        x += cw + spacing;
    }
}
 

/**
 * 重绘文字，两端对齐
 *
 * @param canvas
 */
private void drawTextWithJustify(Canvas canvas) {
    // 文字画笔
    TextPaint textPaint = getPaint();
    textPaint.setColor(getCurrentTextColor());
    textPaint.drawableState = getDrawableState();

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

    Layout layout = getLayout();

    //循环每一行,绘制文字
    for (int i = 0; i < layout.getLineCount(); i++) {
        int lineStart = layout.getLineStart(i);
        int lineEnd = layout.getLineEnd(i);
        //获取到TextView每行中的内容
        String line_str = text_str.substring(lineStart, lineEnd);
        // 获取每行字符串的宽度(不包括字符间距)
        float desiredWidth = StaticLayout.getDesiredWidth(text_str, lineStart, lineEnd, getPaint());

        if (isLineNeedJustify(line_str)) {
            //最后一行不需要重绘
            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();
    }
}
 

/**
 * 计算字符距离控件左侧的位移
 *
 * @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();
    // 最左侧
    if (lineStart == charOffset)
        return getPaddingLeft();
    // 最右侧
    if (charOffset == lineEnd - 1)
        return mViewTextWidth + getPaddingLeft();

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

    // 中间位置
    // 计算相邻字符之间需要填充的宽度
    // (TextView内容的实际宽度 - 该行字符串的宽度)/（字符个数-1）
    float insert_blank = (mViewTextWidth - desiredWidth) / (line_str.length() - 1);
    // 计算当前字符左侧所有字符的宽度
    float allLeftCharWidth = StaticLayout.getDesiredWidth(text_str.substring(lineStart, charOffset), getPaint());

    // 相邻字符之间需要填充的宽度 + 当前字符左侧所有字符的宽度
    return insert_blank * (charOffset - lineStart) + allLeftCharWidth + getPaddingLeft();

}
 

@Override
protected void onDraw(Canvas canvas) {
	TextPaint paint = getPaint();
	paint.setColor(getCurrentTextColor());
	paint.drawableState = getDrawableState();
	mViewWidth = getMeasuredWidth();
	String text = getText().toString();
	mLineY = 0;
	mLineY += getTextSize();
	Layout layout = getLayout();

	// layout.getLayout()在4.4.3出现NullPointerException
	if (layout == null) {
		return;
	}

	Paint.FontMetrics fm = paint.getFontMetrics();

	int textHeight = (int) (Math.ceil(fm.descent - fm.ascent));
	textHeight = (int) (textHeight * layout.getSpacingMultiplier() + layout
			.getSpacingAdd());

	for (int i = 0; i < layout.getLineCount(); i++) {
		int lineStart = layout.getLineStart(i);
		int lineEnd = layout.getLineEnd(i);
		float width = StaticLayout.getDesiredWidth(text, lineStart,
				lineEnd, getPaint());
		String line = text.substring(lineStart, lineEnd);
		if (needScale(line)) {
			drawScaledText(canvas, lineStart, line, width);
		} else {
			canvas.drawText(line, 0, mLineY, paint);
		}
		mLineY += textHeight;
	}
}
 

@Override
protected void onDraw(Canvas canvas) {
    TextPaint paint = getPaint();
    paint.setColor(getCurrentTextColor());
    paint.drawableState = getDrawableState();
    mViewWidth = getMeasuredWidth();
    String text = getText().toString();
    mLineY = 0;
    mLineY += getTextSize();
    Layout layout = getLayout();

    // layout.getLayout()在4.4.3出现NullPointerException
    if (layout == null) {
        return;
    }

    Paint.FontMetrics fm = paint.getFontMetrics();

    int textHeight = (int) (Math.ceil(fm.descent - fm.ascent));
    textHeight = (int) (textHeight * layout.getSpacingMultiplier() + layout
            .getSpacingAdd());
    //解决了最后一行文字间距过大的问题
    for (int i = 0; i < layout.getLineCount(); i++) {
        int lineStart = layout.getLineStart(i);
        int lineEnd = layout.getLineEnd(i);
        float width = StaticLayout.getDesiredWidth(text, lineStart,
                lineEnd, getPaint());
        String line = text.substring(lineStart, lineEnd);

        if (i < layout.getLineCount() - 1) {
            if (needScale(line)) {
                drawScaledText(canvas, lineStart, line, width);
            } else {
                canvas.drawText(line, 0, mLineY, paint);
            }
        } else {
            canvas.drawText(line, 0, mLineY, paint);
        }
        mLineY += textHeight;
    }
}
 

@Override
    public boolean drawChild(Canvas canvas, View child, long drawingTime) {
        // resize the text size if text can not be shown completely
        if (child instanceof TextView) {
            String data = ((TextView) child).getText().toString();
            if (((TextView) child).getTextSize() == mTextSize) {
                float finalTextSize = mTextSize;
                float dataStringW = StaticLayout.getDesiredWidth(data, 0, data.length(), ((TextView) child).getPaint());
                if (getHorizontalSpace() > 0 && dataStringW * 1.1f > getHorizontalSpace()) {
                    finalTextSize = getHorizontalSpace() / dataStringW / 1.1f * mTextSize;
                }
                ((TextView) child).setTextSize(TypedValue.COMPLEX_UNIT_PX, finalTextSize);
            }
        }

        // scale child X Y
        int centerY = getVerticalSpace() / 2;
        int childCenterY = child.getTop() + child.getHeight() / 2;
        float factor = (centerY - childCenterY) * 1f / centerY;
        float alphaFactor = 1 - 0.7f * Math.abs(factor);
        child.setAlpha(alphaFactor * alphaFactor * alphaFactor);
        float scaleFactor = 1 - 0.3f * Math.abs(factor);
        child.setScaleX(scaleFactor);
        child.setScaleY(scaleFactor);

        // rotateX calculate rotate radius
        float rotateRadius = 2.0f * centerY / (float) Math.PI;
        float rad = (centerY - childCenterY) * 1f / rotateRadius;
        float offsetZ = rotateRadius * (1 - (float) Math.cos(rad));
        float rotateDeg = rad * 180 / (float) Math.PI;
        // offset Y for item rotate
        float offsetY = centerY - childCenterY - rotateRadius * (float) Math.sin(rad) * 1.3f;
        child.setTranslationY(offsetY);

        // for most of all devices, the childview would be rotated around X-axis perfectly by calling
        // view's setRotationX(). But, this would not work on huawei devices. so for the compatibility
        // here we resolve this compatibility-bug through another way by using Camera;

//  ViewCompat.setZ(child, -offsetZ);
//  child.setRotationX(rotateDeg);

        canvas.save();
        mCamera.save();
        mCamera.translate(0, 0, offsetZ);
        mCamera.rotateX(rotateDeg);
        mCamera.getMatrix(mMatrix);
        mCamera.restore();
        mMatrix.preTranslate(-child.getWidth() / 2, -childCenterY);
        mMatrix.postTranslate(child.getWidth() / 2, childCenterY);
        canvas.concat(mMatrix);
        boolean result = super.drawChild(canvas, child, drawingTime);
        canvas.restore();
        return result;

//        // parent centerY ,item centerY
//        int centerY = (getHeight() - getPaddingTop() - getPaddingBottom()) / 2;
//        int childCenterY = child.getTop() + child.getHeight() / 2;
//        // alpha
//        float factor = (centerY - childCenterY) * 1f / centerY;
//        float currentFactor = 1 - 0.7f * Math.abs(factor);
//        child.setAlpha(currentFactor * currentFactor * currentFactor);
//
//        // rotate radius
//        float rotateRadius = 2.5f * centerY / (float) Math.PI;
//        // deg
//        float rad = (centerY - childCenterY) * 1f / rotateRadius;
//        float rotateDeg = rad * 180 / (float) Math.PI;
//        // for camera
//        float offsetZ = rotateRadius * (1 - (float) Math.cos(rad));
//        canvas.save();
//        // offset Y for item rotate
//        float offsetY = centerY - childCenterY - rotateRadius * (float) Math.sin(rad);
//        canvas.translate(0, offsetY);
//        mCamera.save();
//        mCamera.translate(0, 0, offsetZ);
//        mCamera.rotateX(rotateDeg);
//        mCamera.getMatrix(mMatrix);
//        mCamera.restore();
//        mMatrix.preTranslate(-child.getWidth() / 2, -childCenterY);
//        mMatrix.postTranslate(child.getWidth() / 2, childCenterY);
//        canvas.concat(mMatrix);
//        super.drawChild(canvas, child, drawingTime);
//        canvas.restore();
//        return true;
    }
 

@Override
protected void onDraw(Canvas canvas) {
    TextPaint paint = getPaint();
    paint.setColor(getCurrentTextColor());
    // 返回绘制状态的资源ID数组表示视图的当前状态
    paint.drawableState = getDrawableState();
    // 对View上的内容进行测量后得到的View内容占据的宽度
    // 前提是你必须在父布局的onLayout()方法或者此View的onDraw()方法里调用measure(0,0);
    // 否则你得到的结果和getWidth()得到的结果一样。
    mViewWidth = getMeasuredWidth();
    // 获取文本
    String text = getText().toString();
    mLineY = 0;
    mLineY += getTextSize();
    // 获取用于显示当前文本的布局
    Layout layout = getLayout();

    if (layout == null) {
        return;
    }

    Paint.FontMetrics fm = paint.getFontMetrics();

    int textHeight = (int) (Math.ceil(fm.descent - fm.ascent));
    textHeight = (int) (textHeight * layout.getSpacingMultiplier() + layout.getSpacingAdd());

    for (int i = 0; i < layout.getLineCount(); i++) {
        // 返回文本中的指定行开头的偏移
        int lineStart = layout.getLineStart(i);
        // 返回文本中的指定行最后一个字符的偏移
        int lineEnd = layout.getLineEnd(i);
        float width = StaticLayout.getDesiredWidth(text, lineStart, lineEnd, getPaint());
        String line = text.substring(lineStart, lineEnd);

        if (line.equals("")) {
            break;
        }

        if (i < layout.getLineCount() - 1) {
            if (needScale(line)) {
                drawScaledText(canvas, lineStart, line, width);
            } else {
                canvas.drawText(line, 0, mLineY, paint);
            }
        } else {
            canvas.drawText(line, 0, mLineY, paint);
        }

        // 增加行高
        mLineY += textHeight;
    }
}