Java Layout.getLineForOffset方法代码示例

import android.text.Layout; //导入方法依赖的package包/类
private float[] getScreenCoordsForPos(int line, int pos)
{
	LayoutManager manager = getLayoutManager();
	ViewHolder holder = findViewHolderForAdapterPosition(line);
	if(holder == null)
	{
		if(getChildCount() > 0 && getChildAdapterPosition(getChildAt(getChildCount() - 1)) < line)
			return new float[]{getWidth() / 2, getHeight(), 0};
		return new float[]{getWidth() / 2, 0, 0};
	}
	View view = manager.findViewByPosition(findViewHolderForAdapterPosition(line).getLayoutPosition());
	if(view == null)
		return new float[]{0, 0, 0};
	Layout layout = ((TextView)view).getLayout();
	float x = layout.getPrimaryHorizontal(pos);
	int ln = layout.getLineForOffset(pos);
	float y = (float)(layout.getLineTop(ln) + layout.getLineBottom(ln)) / 2;
	float screenX = x + view.getLeft() + getScrollX();
	float screenY = y + view.getTop() + getScrollY();
	if(screenY < 0)
		screenY = 0;
	if(screenY > getBottom())
		screenY = getBottom();
	return new float[]{screenX, screenY, layout.getLineBottom(ln) - y};
}
 

import android.text.Layout; //导入方法依赖的package包/类
protected void onPopupChangePosition() {
    try {
        Layout layout = getLayout();
        if (layout != null) {
            int pos = getSelectionStart();
            int line = layout.getLineForOffset(pos);
            int baseline = layout.getLineBaseline(line);
            int ascent = layout.getLineAscent(line);

            float x = layout.getPrimaryHorizontal(pos);
            float y = baseline + ascent;

            int offsetHorizontal = (int) x + mLeftPadding;
            setDropDownHorizontalOffset(offsetHorizontal);

            int heightVisible = getHeightVisible();
            int offsetVertical = (int) ((y + mCharHeight) - getScrollY());

            int tmp = offsetVertical + getDropDownHeight() + mCharHeight;
            if (tmp < heightVisible) {
                tmp = offsetVertical + mCharHeight / 2;
                setDropDownVerticalOffset(tmp);
            } else {
                tmp = offsetVertical - getDropDownHeight() - mCharHeight;
                setDropDownVerticalOffset(tmp);
            }
        }
    } catch (Exception ignored) {
        //nothing
    }
}
 

import android.text.Layout; //导入方法依赖的package包/类
public void updatePosition() {

		if ( storedPosition == -1 && this.storedPercentage == -1d ) {
			return;  //Hopefully come back later
		}

		if ( childView.getText().length() == 0 ) {
			return;
		}

		if ( storedPercentage != -1d ) {
			this.storedPosition = (int) (this.childView.getText().length() * storedPercentage);
			this.storedPercentage = -1d;
		}

		Layout layout = this.childView.getLayout();

		if ( layout != null ) {
			int pos = Math.max(0, this.storedPosition);
			int line = layout.getLineForOffset(pos);

			if ( line > 0 ) {
				int newPos = layout.getLineBottom(line -1);
				bookView.scrollTo(0, newPos);
			} else {
				bookView.scrollTo(0, 0);
			}
		}						 
	}
 

import android.text.Layout; //导入方法依赖的package包/类
@Override
public void onPopupChangePosition() {
    try {
        Layout layout = getLayout();
        if (layout != null) {
            int pos = getSelectionStart();
            int line = layout.getLineForOffset(pos);
            int baseline = layout.getLineBaseline(line);
            int ascent = layout.getLineAscent(line);

            float x = layout.getPrimaryHorizontal(pos);
            float y = baseline + ascent;

            int offsetHorizontal = (int) x + mLinePadding;
            setDropDownHorizontalOffset(offsetHorizontal);

            int heightVisible = getHeightVisible();
            int offsetVertical = 0;
            if (verticalScroll != null) {
                offsetVertical = (int) ((y + mCharHeight) - verticalScroll.getScrollY());
            } else {
                offsetVertical = (int) ((y + mCharHeight) - getScrollY());
            }

            int tmp = offsetVertical + getDropDownHeight() + mCharHeight;
            if (tmp < heightVisible) {
                tmp = offsetVertical + mCharHeight / 2;
                setDropDownVerticalOffset(tmp);
            } else {
                tmp = offsetVertical - getDropDownHeight() - mCharHeight;
                setDropDownVerticalOffset(tmp);
            }
        }
    } catch (Exception ignored) {
    }
}
 

import android.text.Layout; //导入方法依赖的package包/类
/**
 * 获取光标所在行数，对应段落
 *
 * @return 光标所在行数 0，1，2，3
 */
private int getCurrentCursorLine() {
    int selectionStart = getSelectionStart();
    Layout layout = getLayout();
    if (selectionStart != -1) {
        return layout.getLineForOffset(selectionStart);
    }
    return -1;
}
 

import android.text.Layout; //导入方法依赖的package包/类
private static boolean isEndOfLineOffset(Layout layout, int offset) {
    return offset > 0 && layout.getLineForOffset(offset) == layout.getLineForOffset(offset - 1) + 1;
}