android.support.v7.widget.OrientationHelper#getTotalSpace ( )源码实例Demo

下面列出了android.support.v7.widget.OrientationHelper#getTotalSpace ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。

源代码1 项目： MangoBloggerAndroidApp 文件： GravitySnapHelper.java

private View findEndView(RecyclerView.LayoutManager layoutManager,
                         OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        int lastChild = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();

        if (lastChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(lastChild);

        float visibleWidth;

        if (mIsRtlHorizontal) {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        }

        // If we're at the start of the list, we shouldn't snap
        // to avoid having the first item not completely visible.
        boolean startOfList = ((LinearLayoutManager) layoutManager)
                .findFirstCompletelyVisibleItemPosition() == 0;

        if (visibleWidth > 0.5f && !startOfList) {
            return child;
        } else if (mSnapLastItemEnabled && startOfList) {
            return child;
        } else if (startOfList) {
            return null;
        } else {
            // If the child wasn't returned, we need to return the previous view
            return layoutManager.findViewByPosition(lastChild - 1);
        }
    }
    return null;
}

源代码2 项目： date_picker_converter 文件： GravitySnapHelper.java

private View findEndView(RecyclerView.LayoutManager layoutManager,
                         OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        int lastChild = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();

        if (lastChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(lastChild);

        float visibleWidth;

        if (isRtlHorizontal) {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        }

        // If we're at the start of the list, we shouldn't snap
        // to avoid having the first item not completely visible.
        boolean startOfList = ((LinearLayoutManager) layoutManager)
                .findFirstCompletelyVisibleItemPosition() == 0;

        if (visibleWidth > 0.5f && !startOfList) {
            return child;
        } else if (startOfList) {
            return null;
        } else {
            // If the child wasn't returned, we need to return the previous view
            return layoutManager.findViewByPosition(lastChild - 1);
        }
    }
    return null;
}

源代码3 项目： YCScrollPager 文件： ScrollPageHelper.java

@Nullable
private View findStartView(RecyclerView.LayoutManager layoutManager,
                           @NonNull OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
        boolean reverseLayout = linearLayoutManager.getReverseLayout();
        int firstChild = reverseLayout ? linearLayoutManager.findLastVisibleItemPosition()
                : linearLayoutManager.findFirstVisibleItemPosition();
        int offset = 1;

        if (layoutManager instanceof GridLayoutManager) {
            offset += ((GridLayoutManager) layoutManager).getSpanCount() - 1;
        }

        if (firstChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(firstChild);

        float visibleWidth;
        if (isRtlHorizontal) {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        }
        boolean endOfList;
        if (!reverseLayout) {
            endOfList = ((LinearLayoutManager) layoutManager)
                    .findLastCompletelyVisibleItemPosition()
                    == layoutManager.getItemCount() - 1;
        } else {
            endOfList = ((LinearLayoutManager) layoutManager)
                    .findFirstCompletelyVisibleItemPosition()
                    == 0;
        }

        if (visibleWidth > 0.5f && !endOfList) {
            return child;
        } else if (snapLastItem && endOfList) {
            return child;
        } else if (endOfList) {
            return null;
        } else {
            return reverseLayout ? layoutManager.findViewByPosition(firstChild - offset)
                    : layoutManager.findViewByPosition(firstChild + offset);
        }
    }

    return null;
}

源代码4 项目： YCScrollPager 文件： ScrollPageHelper.java

@Nullable
private View findEndView(RecyclerView.LayoutManager layoutManager,
                         @NonNull OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
        boolean reverseLayout = linearLayoutManager.getReverseLayout();
        int lastChild = reverseLayout ? linearLayoutManager.findFirstVisibleItemPosition()
                : linearLayoutManager.findLastVisibleItemPosition();
        int offset = 1;

        if (layoutManager instanceof GridLayoutManager) {
            offset += ((GridLayoutManager) layoutManager).getSpanCount() - 1;
        }

        if (lastChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(lastChild);

        float visibleWidth;

        if (isRtlHorizontal) {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        }

        boolean startOfList;
        if (!reverseLayout) {
            startOfList = ((LinearLayoutManager) layoutManager)
                    .findFirstCompletelyVisibleItemPosition() == 0;
        } else {
            startOfList = ((LinearLayoutManager) layoutManager)
                    .findLastCompletelyVisibleItemPosition()
                    == layoutManager.getItemCount() - 1;
        }

        if (visibleWidth > 0.5f && !startOfList) {
            return child;
        } else if (snapLastItem && startOfList) {
            return child;
        } else if (startOfList) {
            return null;
        } else {
            return reverseLayout ? layoutManager.findViewByPosition(lastChild + offset)
                    : layoutManager.findViewByPosition(lastChild - offset);
        }
    }
    return null;
}

源代码5 项目： Orin 文件： GravityDelegate.java

/**
 * Returns the first view that we should snap to.
 *
 * @param layoutManager the recyclerview's layout manager
 * @param helper        orientation helper to calculate view sizes
 * @return the first view in the LayoutManager to snap to
 */
private View findStartView(RecyclerView.LayoutManager layoutManager,
                           OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        int firstChild = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();
        int offset = 1;

        if (layoutManager instanceof GridLayoutManager) {
            offset += ((GridLayoutManager) layoutManager).getSpanCount() - 1;
        }

        if (firstChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(firstChild);

        float visibleWidth;

        // We should return the child if it's visible width
        // is greater than 0.5 of it's total width.
        // In a RTL configuration, we need to check the start point and in LTR the end point
        if (isRtlHorizontal) {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        }

        // If we're at the end of the list, we shouldn't snap
        // to avoid having the last item not completely visible.
        boolean endOfList = ((LinearLayoutManager) layoutManager)
                .findLastCompletelyVisibleItemPosition()
                == layoutManager.getItemCount() - 1;

        if (visibleWidth > 0.5f && !endOfList) {
            return child;
        } else if (snapLastItem && endOfList) {
            return child;
        } else if (endOfList) {
            return null;
        } else {
            // If the child wasn't returned, we need to return
            // the next view close to the start.
            return layoutManager.findViewByPosition(firstChild + offset);
        }
    }

    return null;
}

源代码6 项目： Orin 文件： GravityDelegate.java

private View findEndView(RecyclerView.LayoutManager layoutManager,
                         OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        int lastChild = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
        int offset = 1;

        if (layoutManager instanceof GridLayoutManager) {
            offset += ((GridLayoutManager) layoutManager).getSpanCount() - 1;
        }

        if (lastChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(lastChild);

        float visibleWidth;

        if (isRtlHorizontal) {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        }

        // If we're at the start of the list, we shouldn't snap
        // to avoid having the first item not completely visible.
        boolean startOfList = ((LinearLayoutManager) layoutManager)
                .findFirstCompletelyVisibleItemPosition() == 0;

        if (visibleWidth > 0.5f && !startOfList) {
            return child;
        } else if (snapLastItem && startOfList) {
            return child;
        } else if (startOfList) {
            return null;
        } else {
            // If the child wasn't returned, we need to return the previous view
            return layoutManager.findViewByPosition(lastChild - offset);
        }
    }
    return null;
}

源代码7 项目： YCBanner 文件： ScrollPageHelper.java

@Nullable
private View findStartView(RecyclerView.LayoutManager layoutManager,
                           @NonNull OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
        boolean reverseLayout = linearLayoutManager.getReverseLayout();
        int firstChild = reverseLayout ? linearLayoutManager.findLastVisibleItemPosition()
                : linearLayoutManager.findFirstVisibleItemPosition();
        int offset = 1;

        if (layoutManager instanceof GridLayoutManager) {
            offset += ((GridLayoutManager) layoutManager).getSpanCount() - 1;
        }

        if (firstChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(firstChild);

        float visibleWidth;
        if (isRtlHorizontal) {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        }
        boolean endOfList;
        if (!reverseLayout) {
            endOfList = ((LinearLayoutManager) layoutManager)
                    .findLastCompletelyVisibleItemPosition()
                    == layoutManager.getItemCount() - 1;
        } else {
            endOfList = ((LinearLayoutManager) layoutManager)
                    .findFirstCompletelyVisibleItemPosition()
                    == 0;
        }

        if (visibleWidth > 0.5f && !endOfList) {
            return child;
        } else if (snapLastItem && endOfList) {
            return child;
        } else if (endOfList) {
            return null;
        } else {
            return reverseLayout ? layoutManager.findViewByPosition(firstChild - offset)
                    : layoutManager.findViewByPosition(firstChild + offset);
        }
    }

    return null;
}

源代码8 项目： YCBanner 文件： ScrollPageHelper.java

@Nullable
private View findEndView(RecyclerView.LayoutManager layoutManager,
                         @NonNull OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
        boolean reverseLayout = linearLayoutManager.getReverseLayout();
        int lastChild = reverseLayout ? linearLayoutManager.findFirstVisibleItemPosition()
                : linearLayoutManager.findLastVisibleItemPosition();
        int offset = 1;

        if (layoutManager instanceof GridLayoutManager) {
            offset += ((GridLayoutManager) layoutManager).getSpanCount() - 1;
        }

        if (lastChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(lastChild);

        float visibleWidth;

        if (isRtlHorizontal) {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        }

        boolean startOfList;
        if (!reverseLayout) {
            startOfList = ((LinearLayoutManager) layoutManager)
                    .findFirstCompletelyVisibleItemPosition() == 0;
        } else {
            startOfList = ((LinearLayoutManager) layoutManager)
                    .findLastCompletelyVisibleItemPosition()
                    == layoutManager.getItemCount() - 1;
        }

        if (visibleWidth > 0.5f && !startOfList) {
            return child;
        } else if (snapLastItem && startOfList) {
            return child;
        } else if (startOfList) {
            return null;
        } else {
            return reverseLayout ? layoutManager.findViewByPosition(lastChild + offset)
                    : layoutManager.findViewByPosition(lastChild - offset);
        }
    }
    return null;
}

源代码9 项目： MangoBloggerAndroidApp 文件： GravitySnapHelper.java

/**
 * Returns the first view that we should snap to.
 *
 * @param layoutManager the recyclerview's layout manager
 * @param helper        orientation helper to calculate view sizes
 * @return the first view in the LayoutManager to snap to
 */
private View findStartView(RecyclerView.LayoutManager layoutManager,
                           OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        int firstChild = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();

        if (firstChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(firstChild);

        float visibleWidth;

        // We should return the child if it's visible width
        // is greater than 0.5 of it's total width.
        // In a RTL configuration, we need to check the start point and in LTR the end point
        if (mIsRtlHorizontal) {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        }

        // If we're at the end of the list, we shouldn't snap
        // to avoid having the last item not completely visible.
        boolean endOfList = ((LinearLayoutManager) layoutManager)
                .findLastCompletelyVisibleItemPosition()
                == layoutManager.getItemCount() - 1;

        if (visibleWidth > 0.5f && !endOfList) {
            return child;
        } else if (mSnapLastItemEnabled && endOfList) {
            return child;
        } else if (endOfList) {
            return null;
        } else {
            // If the child wasn't returned, we need to return
            // the next view close to the start.
            return layoutManager.findViewByPosition(firstChild + 1);
        }
    }

    return null;
}

源代码10 项目： YCRefreshView 文件： ScrollPageHelper.java

@Nullable
private View findStartView(RecyclerView.LayoutManager layoutManager,
                           @NonNull OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
        boolean reverseLayout = linearLayoutManager.getReverseLayout();
        int firstChild = reverseLayout ? linearLayoutManager.findLastVisibleItemPosition()
                : linearLayoutManager.findFirstVisibleItemPosition();
        int offset = 1;

        if (layoutManager instanceof GridLayoutManager) {
            offset += ((GridLayoutManager) layoutManager).getSpanCount() - 1;
        }

        if (firstChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(firstChild);

        float visibleWidth;
        if (isRtlHorizontal) {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        }
        boolean endOfList;
        if (!reverseLayout) {
            endOfList = ((LinearLayoutManager) layoutManager)
                    .findLastCompletelyVisibleItemPosition()
                    == layoutManager.getItemCount() - 1;
        } else {
            endOfList = ((LinearLayoutManager) layoutManager)
                    .findFirstCompletelyVisibleItemPosition()
                    == 0;
        }

        if (visibleWidth > 0.5f && !endOfList) {
            return child;
        } else if (snapLastItem && endOfList) {
            return child;
        } else if (endOfList) {
            return null;
        } else {
            return reverseLayout ? layoutManager.findViewByPosition(firstChild - offset)
                    : layoutManager.findViewByPosition(firstChild + offset);
        }
    }

    return null;
}

源代码11 项目： YCRefreshView 文件： ScrollPageHelper.java

@Nullable
private View findEndView(RecyclerView.LayoutManager layoutManager,
                         @NonNull OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
        boolean reverseLayout = linearLayoutManager.getReverseLayout();
        int lastChild = reverseLayout ? linearLayoutManager.findFirstVisibleItemPosition()
                : linearLayoutManager.findLastVisibleItemPosition();
        int offset = 1;

        if (layoutManager instanceof GridLayoutManager) {
            offset += ((GridLayoutManager) layoutManager).getSpanCount() - 1;
        }

        if (lastChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(lastChild);

        float visibleWidth;

        if (isRtlHorizontal) {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        }

        boolean startOfList;
        if (!reverseLayout) {
            startOfList = ((LinearLayoutManager) layoutManager)
                    .findFirstCompletelyVisibleItemPosition() == 0;
        } else {
            startOfList = ((LinearLayoutManager) layoutManager)
                    .findLastCompletelyVisibleItemPosition()
                    == layoutManager.getItemCount() - 1;
        }

        if (visibleWidth > 0.5f && !startOfList) {
            return child;
        } else if (snapLastItem && startOfList) {
            return child;
        } else if (startOfList) {
            return null;
        } else {
            return reverseLayout ? layoutManager.findViewByPosition(lastChild + offset)
                    : layoutManager.findViewByPosition(lastChild - offset);
        }
    }
    return null;
}

源代码12 项目： date_picker_converter 文件： GravitySnapHelper.java

/**
 * Returns the first view that we should snap to.
 *
 * @param layoutManager the recyclerview's layout manager
 * @param helper        orientation helper to calculate view sizes
 * @return the first view in the LayoutManager to snap to
 */
private View findStartView(RecyclerView.LayoutManager layoutManager,
                           OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        int firstChild = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();

        if (firstChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(firstChild);

        float visibleWidth;

        // We should return the child if it's visible width
        // is greater than 0.5 of it's total width.
        // In a RTL configuration, we need to check the start point and in LTR the end point
        if (isRtlHorizontal) {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        }

        // If we're at the end of the list, we shouldn't snap
        // to avoid having the last item not completely visible.
        boolean endOfList = ((LinearLayoutManager) layoutManager)
                .findLastCompletelyVisibleItemPosition()
                == layoutManager.getItemCount() - 1;

        if (visibleWidth > 0.5f && !endOfList) {
            return child;
        } else if (endOfList) {
            return null;
        } else {
            // If the child wasn't returned, we need to return
            // the next view close to the start.
            return layoutManager.findViewByPosition(firstChild + 1);
        }
    }

    return null;
}

源代码13 项目： SuntimesWidget 文件： GravitySnapHelper.java

/**
 * Returns the first view that we should snap to.
 *
 * @param layoutManager the RecyclerView's LayoutManager
 * @param helper        orientation helper to calculate view sizes
 * @param gravity       gravity to find the closest view
 * @return the first view in the LayoutManager to snap to, or null if we shouldn't snap to any
 */
@Nullable
private View findView(@NonNull RecyclerView.LayoutManager layoutManager,
                      @NonNull OrientationHelper helper,
                      int gravity,
                      boolean checkEdgeOfList) {

    if (layoutManager.getChildCount() == 0 || !(layoutManager instanceof LinearLayoutManager)) {
        return null;
    }

    final LinearLayoutManager lm = (LinearLayoutManager) layoutManager;

    // If we're at an edge of the list, we shouldn't snap
    // to avoid having the last item not completely visible.
    if (checkEdgeOfList && (isAtEdgeOfList(lm) && !snapLastItem)) {
        return null;
    }

    View edgeView = null;
    int distanceToTarget = Integer.MAX_VALUE;
    final int center;
    if (layoutManager.getClipToPadding()) {
        center = helper.getStartAfterPadding() + helper.getTotalSpace() / 2;
    } else {
        center = helper.getEnd() / 2;
    }

    final boolean snapToStart = (gravity == Gravity.START && !isRtl)
            || (gravity == Gravity.END && isRtl);

    final boolean snapToEnd = (gravity == Gravity.START && isRtl)
            || (gravity == Gravity.END && !isRtl);

    for (int i = 0; i < lm.getChildCount(); i++) {
        View currentView = lm.getChildAt(i);
        int currentViewDistance;
        if (snapToStart) {
            if (!snapToPadding) {
                currentViewDistance = Math.abs(helper.getDecoratedStart(currentView));
            } else {
                currentViewDistance = Math.abs(helper.getStartAfterPadding()
                        - helper.getDecoratedStart(currentView));
            }
        } else if (snapToEnd) {
            if (!snapToPadding) {
                currentViewDistance = Math.abs(helper.getDecoratedEnd(currentView)
                        - helper.getEnd());
            } else {
                currentViewDistance = Math.abs(helper.getEndAfterPadding()
                        - helper.getDecoratedEnd(currentView));
            }
        } else {
            currentViewDistance = Math.abs(helper.getDecoratedStart(currentView)
                    + (helper.getDecoratedMeasurement(currentView) / 2) - center);
        }
        if (currentViewDistance < distanceToTarget) {
            distanceToTarget = currentViewDistance;
            edgeView = currentView;
        }
    }
    return edgeView;
}

方法所在类

android.support.v7.widget.OrientationHelper