Java View.isLayoutRequested方法代码示例

import android.view.View; //导入方法依赖的package包/类
/**
   * Get the position rect for the given child. If the child has currently requested layout
   * or has a visibility of GONE.
 *
 * @param child child view to check
   * @param transform true to include transformation in the output rect, false to
   *                        only account for the base position
 * @param out rect to set to the output values
 */
void getChildRect(View child, boolean transform, Rect out) {
  if (child.isLayoutRequested() || child.getVisibility() == View.GONE) {
    out.setEmpty();
    return;
  }
  if (transform) {
    getDescendantRect(child, out);
  } else {
    out.set(child.getLeft(), child.getTop(), child.getRight(), child.getBottom());
  }
}
 

import android.view.View; //导入方法依赖的package包/类
private void processLayoutRequest() {
  mIsLayoutRequested = false;
  for (int i = 0, childCount = getChildCount(); i != childCount; ++i) {
    View child = getChildAt(i);
    if (!child.isLayoutRequested()) {
      continue;
    }

    child.measure(
      MeasureSpec.makeMeasureSpec(child.getWidth(), MeasureSpec.EXACTLY),
      MeasureSpec.makeMeasureSpec(child.getHeight(), MeasureSpec.EXACTLY));
    child.layout(child.getLeft(), child.getTop(), child.getRight(), child.getBottom());
  }
}
 

import android.view.View; //导入方法依赖的package包/类
private void ensurePinnedHeaderLayout(View header, boolean forceLayout) {
    if (header.isLayoutRequested() || forceLayout) {
        int widthSpec = MeasureSpec.makeMeasureSpec(getMeasuredWidth(), MeasureSpec.EXACTLY);
        int heightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
        try {
            header.measure(widthSpec, heightSpec);
        } catch (Exception e) {
            FileLog.e("tmessages", e);
        }
        header.layout(0, 0, header.getMeasuredWidth(), header.getMeasuredHeight());
    }
}
 

import android.view.View; //导入方法依赖的package包/类
private int measureScrollBar(int position, float selectPercent, boolean needChange) {
    if (scrollBar == null)
        return 0;
    View view = scrollBar.getSlideView();
    if (view.isLayoutRequested() || needChange) {
        View selectV = linearLayoutManager.findViewByPosition(position);
        View unSelectV = linearLayoutManager.findViewByPosition(position + 1);
        if (selectV != null) {
            int tabWidth = (int) (selectV.getWidth() * (1 - selectPercent) + (unSelectV == null ? 0 : unSelectV.getWidth() * selectPercent));
            int width = scrollBar.getWidth(tabWidth);
            int height = scrollBar.getHeight(getHeight());
            view.measure(width, height);
            view.layout(0, 0, width, height);
            return tabWidth;
        }
    }
    return scrollBar.getSlideView().getWidth();
}
 

import android.view.View; //导入方法依赖的package包/类
private int measureScrollBar(int position, float selectPercent, boolean needChange) {
    if (scrollBar == null)
        return 0;
    View view = scrollBar.getSlideView();
    if (view.isLayoutRequested() || needChange) {
        View selectV = getItemOutView(position);
        View unSelectV;
        if (position + 1 < mAdapter.getCount()) {
            unSelectV = getItemOutView(position + 1);
        } else {
            unSelectV = getItemOutView(0);
        }
        if (selectV != null) {
            int tabWidth = (int) (selectV.getWidth() * (1 - selectPercent) + (unSelectV == null ? 0 : unSelectV.getWidth() * selectPercent));
            int width = scrollBar.getWidth(tabWidth);
            int height = scrollBar.getHeight(getHeight());
            view.measure(width, height);
            view.layout(0, 0, width, height);
            return tabWidth;
        }
    }
    return scrollBar.getSlideView().getWidth();
}
 

import android.view.View; //导入方法依赖的package包/类
/**
 * 
 */
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    
    int height = MeasureSpec.getSize(heightMeasureSpec);
    int width = MeasureSpec.getSize(widthMeasureSpec);

    int heightMode = MeasureSpec.getMode(heightMeasureSpec);

    final View child = getChildAt(0);
    if (child == null) {
        setMeasuredDimension(0, width);
        return;
    }

    if (child.isLayoutRequested()) {
        // Always let child be as tall as it wants.
        measureChild(child, widthMeasureSpec,
                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
    }

    if (heightMode == MeasureSpec.UNSPECIFIED) {
        ViewGroup.LayoutParams lp = getLayoutParams();

        if (lp.height > 0) {
            height = lp.height;
        } else {
            height = child.getMeasuredHeight();
        }
    }

    setMeasuredDimension(width, height);
}
 

import android.view.View; //导入方法依赖的package包/类
/**
 *
 */
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

    int height = MeasureSpec.getSize(heightMeasureSpec);
    int width = MeasureSpec.getSize(widthMeasureSpec);

    int heightMode = MeasureSpec.getMode(heightMeasureSpec);

    final View child = getChildAt(0);
    if (child == null) {
        setMeasuredDimension(0, width);
        return;
    }

    if (child.isLayoutRequested()) {
        // Always let child be as tall as it wants.
        measureChild(child, widthMeasureSpec,
                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
    }

    if (heightMode == MeasureSpec.UNSPECIFIED) {
        LayoutParams lp = getLayoutParams();

        if (lp.height > 0) {
            height = lp.height;
        } else {
            height = child.getMeasuredHeight();
        }
    }

    setMeasuredDimension(width, height);
}
 

import android.view.View; //导入方法依赖的package包/类
@TargetApi(11)
private void setupChild(View child, int position, int x, boolean flowDown, int childrenTop, boolean selected, boolean recycled) {
    boolean isSelected = selected && shouldShowSelector();
    boolean updateChildSelected = isSelected != child.isSelected();
    int mode = this.mTouchMode;
    boolean isPressed = mode > 0 && mode < 3 && this.mMotionPosition == position;
    boolean updateChildPressed = isPressed != child.isPressed();
    boolean needToMeasure = !recycled || updateChildSelected || child.isLayoutRequested();
    LayoutParams p = (LayoutParams) child.getLayoutParams();
    if (p == null) {
        p = (LayoutParams) generateDefaultLayoutParams();
    }
    p.viewType = this.mAdapter.getItemViewType(position);
    if ((!recycled || p.forceAdd) && !(p.recycledHeaderFooter && p.viewType == -2)) {
        p.forceAdd = false;
        if (p.viewType == -2) {
            p.recycledHeaderFooter = true;
        }
        addViewInLayout(child, flowDown ? -1 : 0, p, true);
    } else {
        attachViewToParent(child, flowDown ? -1 : 0, p);
    }
    if (updateChildSelected) {
        child.setSelected(isSelected);
    }
    if (updateChildPressed) {
        child.setPressed(isPressed);
    }
    if (!(this.mChoiceMode == 0 || this.mCheckStates == null)) {
        if (child instanceof Checkable) {
            ((Checkable) child).setChecked(((Boolean) this.mCheckStates.get(position, Boolean.valueOf(false))).booleanValue());
        } else if (VERSION.SDK_INT >= 11) {
            child.setActivated(((Boolean) this.mCheckStates.get(position, Boolean.valueOf(false))).booleanValue());
        }
    }
    if (needToMeasure) {
        int childWidthSpec;
        int childHeightSpec = ViewGroup.getChildMeasureSpec(this.mHeightMeasureSpec, this.mListPadding.top + this.mListPadding.bottom, p.height);
        int lpWidth = p.width;
        if (lpWidth > 0) {
            childWidthSpec = MeasureSpec.makeMeasureSpec(lpWidth, 1073741824);
        } else {
            childWidthSpec = MeasureSpec.makeMeasureSpec(0, 0);
        }
        child.measure(childWidthSpec, childHeightSpec);
    } else {
        cleanupLayoutState(child);
    }
    int w = child.getMeasuredWidth();
    int h = child.getMeasuredHeight();
    int childLeft = flowDown ? x : x - w;
    if (needToMeasure) {
        child.layout(childLeft, childrenTop, childLeft + w, childrenTop + h);
    } else {
        child.offsetLeftAndRight(childLeft - child.getLeft());
        child.offsetTopAndBottom(childrenTop - child.getTop());
    }
    if (this.mCachingStarted && !child.isDrawingCacheEnabled()) {
        child.setDrawingCacheEnabled(true);
    }
    if (VERSION.SDK_INT >= 11 && recycled && ((LayoutParams) child.getLayoutParams()).scrappedFromPosition != position) {
        child.jumpDrawablesToCurrentState();
    }
}
 

import android.view.View; //导入方法依赖的package包/类
private void ensurePinnedHeaderLayout(View header, boolean forceLayout) {
    if (header.isLayoutRequested() || forceLayout) {
        ViewGroup.LayoutParams layoutParams = header.getLayoutParams();
        int heightSpec = MeasureSpec.makeMeasureSpec(layoutParams.height, MeasureSpec.EXACTLY);
        int widthSpec = MeasureSpec.makeMeasureSpec(layoutParams.width, MeasureSpec.EXACTLY);
        try {
            header.measure(widthSpec, heightSpec);
        } catch (Exception e) {
            FileLog.e("tmessages", e);
        }
        header.layout(0, 0, header.getMeasuredWidth(), header.getMeasuredHeight());
    }
}
 

import android.view.View; //导入方法依赖的package包/类
private void setupChild(View child, int position, int y, boolean flowDown, int childrenLeft,
                        boolean selected, boolean recycled) {
    boolean isSelected = selected && shouldShowSelector();
    boolean updateChildSelected = isSelected != child.isSelected();
    int mode = this.mTouchMode;
    boolean isPressed = mode > 0 && mode < 3 && this.mMotionPosition == position;
    boolean updateChildPressed = isPressed != child.isPressed();
    boolean needToMeasure = !recycled || updateChildSelected || child.isLayoutRequested();
    ViewGroup.LayoutParams p = (LayoutParams) child.getLayoutParams();
    if (p == null) {
        ViewGroup.LayoutParams layoutParams = new LayoutParams(-1, -2, 0);
    }
    p.viewType = this.mAdapter.getItemViewType(position);
    p.scrappedFromPosition = position;
    if ((!recycled || p.forceAdd) && !(p.recycledHeaderFooter && p.viewType == -2)) {
        p.forceAdd = false;
        if (p.viewType == -2) {
            p.recycledHeaderFooter = true;
        }
        addViewInLayout(child, flowDown ? -1 : 0, p, true);
    } else {
        attachViewToParent(child, flowDown ? -1 : 0, p);
    }
    if (updateChildSelected) {
        child.setSelected(isSelected);
    }
    if (updateChildPressed) {
        child.setPressed(isPressed);
    }
    if (needToMeasure) {
        int childHeightSpec;
        int childWidthSpec = ViewGroup.getChildMeasureSpec(this.mWidthMeasureSpec, this
                .mListPadding.left + this.mListPadding.right, p.width);
        int lpHeight = p.height;
        if (lpHeight > 0) {
            childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, 1073741824);
        } else {
            childHeightSpec = MeasureSpec.makeMeasureSpec(0, 0);
        }
        onMeasureChild(child, position, childWidthSpec, childHeightSpec);
    } else {
        cleanupLayoutState(child);
    }
    int w = child.getMeasuredWidth();
    int h = child.getMeasuredHeight();
    int childTop = flowDown ? y : y - h;
    if (needToMeasure) {
        onLayoutChild(child, position, childrenLeft, childTop, childrenLeft + w, childTop + h);
    } else {
        onOffsetChild(child, position, childrenLeft - child.getLeft(), childTop - child
                .getTop());
    }
    if (this.mCachingStarted && !child.isDrawingCacheEnabled()) {
        child.setDrawingCacheEnabled(true);
    }
}
 

import android.view.View; //导入方法依赖的package包/类
private void ensurePinnedHeaderLayout(View header) {
    if (header.isLayoutRequested()) {
        int heightSpec;
        int widthSpec = MeasureSpec.makeMeasureSpec(getMeasuredWidth(), this.mWidthMode);
        LayoutParams layoutParams = header.getLayoutParams();
        if (layoutParams == null || layoutParams.height <= 0) {
            heightSpec = MeasureSpec.makeMeasureSpec(0, 0);
        } else {
            heightSpec = MeasureSpec.makeMeasureSpec(layoutParams.height, 1073741824);
        }
        header.measure(widthSpec, heightSpec);
        header.layout(0, 0, header.getMeasuredWidth(), header.getMeasuredHeight());
    }
}
 

import android.view.View; //导入方法依赖的package包/类
void getChildRect(View child, boolean transform, Rect out) {
    if (child.isLayoutRequested() || child.getVisibility() == 8) {
        out.set(0, 0, 0, 0);
    } else if (transform) {
        getDescendantRect(child, out);
    } else {
        out.set(child.getLeft(), child.getTop(), child.getRight(), child.getBottom());
    }
}
 

import android.view.View; //导入方法依赖的package包/类
private void prepareContent() {
	if (mAnimating) {
		return;
	}

	// Something changed in the content, we need to honor the layout request
	// before creating the cached bitmap
	final View content = mContent;
	if (content.isLayoutRequested()) {

		if (mVertical) {
			final int handleHeight = mHandleHeight;
			int height = getBottom() - getTop() - handleHeight - mTopOffset;
			content.measure(MeasureSpec.makeMeasureSpec(getRight()
					- getLeft(), MeasureSpec.EXACTLY), MeasureSpec
					.makeMeasureSpec(height, MeasureSpec.AT_MOST));

			if (mInvert)
				content.layout(0, mTopOffset, content.getMeasuredWidth(),
						mTopOffset + content.getMeasuredHeight());
			else
				content.layout(
						0,
						mTopOffset + handleHeight,
						content.getMeasuredWidth(),
						mTopOffset + handleHeight
								+ content.getMeasuredHeight());

		} else {

			final int handleWidth = mHandle.getWidth();
			int width = getRight() - getLeft() - handleWidth - mTopOffset;
			content.measure(MeasureSpec.makeMeasureSpec(width,
					MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(
					getBottom() - getTop(), MeasureSpec.EXACTLY));

			if (mInvert)
				content.layout(mTopOffset, 0,
						mTopOffset + content.getMeasuredWidth(),
						content.getMeasuredHeight());
			else
				content.layout(handleWidth + mTopOffset, 0, mTopOffset
						+ handleWidth + content.getMeasuredWidth(),
						content.getMeasuredHeight());
		}
	}
	// Try only once... we should really loop but it's not a big deal
	// if the draw was cancelled, it will only be temporary anyway
	content.getViewTreeObserver().dispatchOnPreDraw();
	content.buildDrawingCache();

	content.setVisibility(View.GONE);
}
 

import android.view.View; //导入方法依赖的package包/类
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
private void makeAndAddView(View child, int index) {

    FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) child.getLayoutParams();
    addViewInLayout(child, 0, lp, true);

    final boolean needToMeasure = child.isLayoutRequested();
    if (needToMeasure) {
        int childWidthSpec = getChildMeasureSpec(getWidthMeasureSpec(),
                getPaddingLeft() + getPaddingRight() + lp.leftMargin + lp.rightMargin,
                lp.width);
        int childHeightSpec = getChildMeasureSpec(getHeightMeasureSpec(),
                getPaddingTop() + getPaddingBottom() + lp.topMargin + lp.bottomMargin,
                lp.height);
        child.measure(childWidthSpec, childHeightSpec);
    } else {
        cleanupLayoutState(child);
    }

    int w = child.getMeasuredWidth();
    int h = child.getMeasuredHeight();

    int gravity = lp.gravity;
    if (gravity == -1) {
        gravity = Gravity.TOP | Gravity.START;
    }

    int layoutDirection = 0;
    if (Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN)
        layoutDirection = getLayoutDirection();
    final int absoluteGravity = Gravity.getAbsoluteGravity(gravity, layoutDirection);
    final int verticalGravity = gravity & Gravity.VERTICAL_GRAVITY_MASK;

    int childLeft;
    int childTop;
    switch (absoluteGravity & Gravity.HORIZONTAL_GRAVITY_MASK) {
        case Gravity.CENTER_HORIZONTAL:
            childLeft = (getWidth() + getPaddingLeft() - getPaddingRight()  - w) / 2 +
                    lp.leftMargin - lp.rightMargin;
            break;
        case Gravity.END:
            childLeft = getWidth() + getPaddingRight() - w - lp.rightMargin;
            break;
        case Gravity.START:
        default:
            childLeft = getPaddingLeft() + lp.leftMargin;
            break;
    }
    switch (verticalGravity) {
        case Gravity.CENTER_VERTICAL:
            childTop = (getHeight() + getPaddingTop() - getPaddingBottom()  - h) / 2 +
                    lp.topMargin - lp.bottomMargin;
            break;
        case Gravity.BOTTOM:
            childTop = getHeight() - getPaddingBottom() - h - lp.bottomMargin;
            break;
        case Gravity.TOP:
        default:
            childTop = getPaddingTop() + lp.topMargin;
            break;
    }
    child.layout(childLeft, childTop, childLeft + w, childTop + h);
    // 缩放层叠效果
    adjustChildView(child, index);
}
 

import android.view.View; //导入方法依赖的package包/类
/**
 * RecyclerView internally does its own View measurement caching which should help with
 * WRAP_CONTENT.
 * <p>
 * Use this method if the View is not yet measured and you need to decide whether to
 * measure this View or not.
 */
boolean shouldMeasureChild(View child, int widthSpec, int heightSpec, LayoutParams lp) {
    return child.isLayoutRequested()
            || !mMeasurementCacheEnabled
            || !isMeasurementUpToDate(child.getWidth(), widthSpec, lp.width)
            || !isMeasurementUpToDate(child.getHeight(), heightSpec, lp.height);
}