Java Code Examples for android.view.View#FOCUS_FORWARD

The following examples show how to use android.view.View#FOCUS_FORWARD . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: ScrollViewer.java    From AirFree-Client with GNU General Public License v3.0 6 votes vote down vote up
/**
 * When looking for focus in children of a scroll view, need to be a little
 * more careful not to give focus to something that is scrolled off screen.
 *
 * This is more expensive than the default {@link ViewGroup}
 * implementation, otherwise this behavior might have been made the default.
 */
@Override
protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
 // convert from forward / backward notation to up / down / left / right
 // (ugh).
 if (direction == View.FOCUS_FORWARD) {
	 direction = View.FOCUS_DOWN;
 } else if (direction == View.FOCUS_BACKWARD) {
	 direction = View.FOCUS_UP;
 }

 final View nextFocus = previouslyFocusedRect == null ?
		 FocusFinder.getInstance().findNextFocus(this, null, direction) :
			 FocusFinder.getInstance().findNextFocusFromRect(this,
					 previouslyFocusedRect, direction);

		 if (nextFocus == null) {
			 return false;
		 }

		 return nextFocus.requestFocus(direction, previouslyFocusedRect);
}
 
Example 2
Source File: TwoDScrollView.java    From java-n-IDE-for-Android with Apache License 2.0 6 votes vote down vote up
/**
 * When looking for focus in children of a scroll view, need to be a little
 * more careful not to give focus to something that is scrolled off screen.
 * <p/>
 * This is more expensive than the default {@link android.view.ViewGroup}
 * implementation, otherwise this behavior might have been made the default.
 */
@Override
protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
    // convert from forward / backward notation to up / down / left / right
    // (ugh).
    if (direction == View.FOCUS_FORWARD) {
        direction = View.FOCUS_DOWN;
    } else if (direction == View.FOCUS_BACKWARD) {
        direction = View.FOCUS_UP;
    }

    final View nextFocus = previouslyFocusedRect == null ?
            FocusFinder.getInstance().findNextFocus(this, null, direction) :
            FocusFinder.getInstance().findNextFocusFromRect(this,
                    previouslyFocusedRect, direction);

    if (nextFocus == null) {
        return false;
    }

    return nextFocus.requestFocus(direction, previouslyFocusedRect);
}
 
Example 3
Source File: TwoDScrollView.java    From imsdk-android with MIT License 6 votes vote down vote up
/**
 * When looking for focus in children of a scroll view, need to be a little
 * more careful not to give focus to something that is scrolled off screen.
 * <p/>
 * This is more expensive than the default {@link android.view.ViewGroup}
 * implementation, otherwise this behavior might have been made the default.
 */
@Override
protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
    // convert from forward / backward notation to up / down / left / right
    // (ugh).
    if (direction == View.FOCUS_FORWARD) {
        direction = View.FOCUS_DOWN;
    } else if (direction == View.FOCUS_BACKWARD) {
        direction = View.FOCUS_UP;
    }

    final View nextFocus = previouslyFocusedRect == null ?
            FocusFinder.getInstance().findNextFocus(this, null, direction) :
            FocusFinder.getInstance().findNextFocusFromRect(this,
                    previouslyFocusedRect, direction);

    if (nextFocus == null) {
        return false;
    }

    return nextFocus.requestFocus(direction, previouslyFocusedRect);
}
 
Example 4
Source File: TwoDScrollView.java    From intra42 with Apache License 2.0 5 votes vote down vote up
/**
 * When looking for focus in children of a scroll view, need to be a little more careful not to
 * give focus to something that is scrolled off screen.
 *
 * <p>This is more expensive than the default {@link ViewGroup} implementation,
 * otherwise this behavior might have been made the default.</p>
 */
@Override
protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
    // convert from forward / backward notation to up / down / left / right
    if (direction == View.FOCUS_FORWARD) {
        direction = View.FOCUS_DOWN;
    } else if (direction == View.FOCUS_BACKWARD) {
        direction = View.FOCUS_UP;
    }

    View nextFocus = previouslyFocusedRect == null ? FocusFinder.getInstance().findNextFocus(this, null, direction) :
            FocusFinder.getInstance().findNextFocusFromRect(this, previouslyFocusedRect, direction);
    return nextFocus != null && nextFocus.requestFocus(direction, previouslyFocusedRect);
}
 
Example 5
Source File: AccessibilityNodeInfo.java    From android_9.0.0_r45 with Apache License 2.0 5 votes vote down vote up
private void enforceValidFocusDirection(int direction) {
    switch (direction) {
        case View.FOCUS_DOWN:
        case View.FOCUS_UP:
        case View.FOCUS_LEFT:
        case View.FOCUS_RIGHT:
        case View.FOCUS_FORWARD:
        case View.FOCUS_BACKWARD:
            return;
        default:
            throw new IllegalArgumentException("Unknown direction: " + direction);
    }
}
 
Example 6
Source File: StaggeredGridLayoutManager.java    From Telegram-FOSS with GNU General Public License v2.0 5 votes vote down vote up
/**
 * Converts a focusDirection to orientation.
 *
 * @param focusDirection One of {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN},
 *                       {@link View#FOCUS_LEFT}, {@link View#FOCUS_RIGHT},
 *                       {@link View#FOCUS_BACKWARD}, {@link View#FOCUS_FORWARD}
 *                       or 0 for not applicable
 * @return {@link LayoutState#LAYOUT_START} or {@link LayoutState#LAYOUT_END} if focus direction
 * is applicable to current state, {@link LayoutState#INVALID_LAYOUT} otherwise.
 */
private int convertFocusDirectionToLayoutDirection(int focusDirection) {
    switch (focusDirection) {
        case View.FOCUS_BACKWARD:
            if (mOrientation == VERTICAL) {
                return LayoutState.LAYOUT_START;
            } else if (isLayoutRTL()) {
                return LayoutState.LAYOUT_END;
            } else {
                return LayoutState.LAYOUT_START;
            }
        case View.FOCUS_FORWARD:
            if (mOrientation == VERTICAL) {
                return LayoutState.LAYOUT_END;
            } else if (isLayoutRTL()) {
                return LayoutState.LAYOUT_START;
            } else {
                return LayoutState.LAYOUT_END;
            }
        case View.FOCUS_UP:
            return mOrientation == VERTICAL ? LayoutState.LAYOUT_START
                    : LayoutState.INVALID_LAYOUT;
        case View.FOCUS_DOWN:
            return mOrientation == VERTICAL ? LayoutState.LAYOUT_END
                    : LayoutState.INVALID_LAYOUT;
        case View.FOCUS_LEFT:
            return mOrientation == HORIZONTAL ? LayoutState.LAYOUT_START
                    : LayoutState.INVALID_LAYOUT;
        case View.FOCUS_RIGHT:
            return mOrientation == HORIZONTAL ? LayoutState.LAYOUT_END
                    : LayoutState.INVALID_LAYOUT;
        default:
            if (DEBUG) {
                Log.d(TAG, "Unknown focus request:" + focusDirection);
            }
            return LayoutState.INVALID_LAYOUT;
    }

}
 
Example 7
Source File: LinearLayoutManager.java    From RecyclerViewLib with Apache License 2.0 5 votes vote down vote up
/**
 * Converts a focusDirection to orientation.
 *
 * @param focusDirection One of {@link android.view.View#FOCUS_UP}, {@link android.view.View#FOCUS_DOWN},
 *                       {@link android.view.View#FOCUS_LEFT}, {@link android.view.View#FOCUS_RIGHT},
 *                       {@link android.view.View#FOCUS_BACKWARD}, {@link android.view.View#FOCUS_FORWARD}
 *                       or 0 for not applicable
 * @return {@link com.twotoasters.android.support.v7.widget.LinearLayoutManager.RenderState#LAYOUT_START} or {@link com.twotoasters.android.support.v7.widget.LinearLayoutManager.RenderState#LAYOUT_END} if focus direction
 * is applicable to current state, {@link com.twotoasters.android.support.v7.widget.LinearLayoutManager.RenderState#INVALID_LAYOUT} otherwise.
 */
private int convertFocusDirectionToLayoutDirection(int focusDirection) {
    switch (focusDirection) {
        case View.FOCUS_BACKWARD:
            return RenderState.LAYOUT_START;
        case View.FOCUS_FORWARD:
            return RenderState.LAYOUT_END;
        case View.FOCUS_UP:
            return mOrientation == VERTICAL ? RenderState.LAYOUT_START
                    : RenderState.INVALID_LAYOUT;
        case View.FOCUS_DOWN:
            return mOrientation == VERTICAL ? RenderState.LAYOUT_END
                    : RenderState.INVALID_LAYOUT;
        case View.FOCUS_LEFT:
            return mOrientation == HORIZONTAL ? RenderState.LAYOUT_START
                    : RenderState.INVALID_LAYOUT;
        case View.FOCUS_RIGHT:
            return mOrientation == HORIZONTAL ? RenderState.LAYOUT_END
                    : RenderState.INVALID_LAYOUT;
        default:
            if (DEBUG) {
                Log.d(TAG, "Unknown focus request:" + focusDirection);
            }
            return RenderState.INVALID_LAYOUT;
    }

}
 
Example 8
Source File: NestedScrollView.java    From AndroidAnimationExercise with Apache License 2.0 5 votes vote down vote up
/**
 * When looking for focus in children of a scroll view, need to be a little
 * more careful not to give focus to something that is scrolled off screen.
 *
 * This is more expensive than the default {@link ViewGroup}
 * implementation, otherwise this behavior might have been made the default.
 */
@Override
protected boolean onRequestFocusInDescendants(int direction,
                                              Rect previouslyFocusedRect) {

    // convert from forward / backward notation to up / down / left / right
    // (ugh).
    if (direction == View.FOCUS_FORWARD) {
        direction = View.FOCUS_DOWN;
    } else if (direction == View.FOCUS_BACKWARD) {
        direction = View.FOCUS_UP;
    }

    final View nextFocus = previouslyFocusedRect == null
            ? FocusFinder.getInstance().findNextFocus(this, null, direction)
            : FocusFinder.getInstance().findNextFocusFromRect(
            this, previouslyFocusedRect, direction);

    if (nextFocus == null) {
        return false;
    }

    if (isOffScreen(nextFocus)) {
        return false;
    }

    return nextFocus.requestFocus(direction, previouslyFocusedRect);
}
 
Example 9
Source File: ExposeLinearLayoutManagerEx.java    From vlayout with MIT License 5 votes vote down vote up
/**
 * Converts a focusDirection to orientation.
 *
 * @param focusDirection One of {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN},
 *                       {@link View#FOCUS_LEFT}, {@link View#FOCUS_RIGHT},
 *                       {@link View#FOCUS_BACKWARD}, {@link View#FOCUS_FORWARD}
 *                       or 0 for not applicable
 * @return {@link LayoutState#LAYOUT_START} or {@link LayoutState#LAYOUT_END} if focus direction
 * is applicable to current state, {@link LayoutState#INVALID_LAYOUT} otherwise.
 */
private int convertFocusDirectionToLayoutDirectionExpose(int focusDirection) {
    int orientation = getOrientation();
    switch (focusDirection) {
        case View.FOCUS_BACKWARD:
            return LayoutState.LAYOUT_START;
        case View.FOCUS_FORWARD:
            return LayoutState.LAYOUT_END;
        case View.FOCUS_UP:
            return orientation == VERTICAL ? LayoutState.LAYOUT_START
                    : LayoutState.INVALID_LAYOUT;
        case View.FOCUS_DOWN:
            return orientation == VERTICAL ? LayoutState.LAYOUT_END
                    : LayoutState.INVALID_LAYOUT;
        case View.FOCUS_LEFT:
            return orientation == HORIZONTAL ? LayoutState.LAYOUT_START
                    : LayoutState.INVALID_LAYOUT;
        case View.FOCUS_RIGHT:
            return orientation == HORIZONTAL ? LayoutState.LAYOUT_END
                    : LayoutState.INVALID_LAYOUT;
        default:
            if (DEBUG) {
                Log.d(TAG, "Unknown focus request:" + focusDirection);
            }
            return LayoutState.INVALID_LAYOUT;
    }

}
 
Example 10
Source File: ChatLinearLayoutManager.java    From actor-platform with GNU Affero General Public License v3.0 5 votes vote down vote up
/**
 * Converts a focusDirection to orientation.
 *
 * @param focusDirection One of {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN},
 *                       {@link View#FOCUS_LEFT}, {@link View#FOCUS_RIGHT},
 *                       {@link View#FOCUS_BACKWARD}, {@link View#FOCUS_FORWARD}
 *                       or 0 for not applicable
 * @return {@link LayoutState#LAYOUT_START} or {@link LayoutState#LAYOUT_END} if focus direction
 * is applicable to current state, {@link LayoutState#INVALID_LAYOUT} otherwise.
 */
private int convertFocusDirectionToLayoutDirection(int focusDirection) {
    switch (focusDirection) {
        case View.FOCUS_BACKWARD:
            return LayoutState.LAYOUT_START;
        case View.FOCUS_FORWARD:
            return LayoutState.LAYOUT_END;
        case View.FOCUS_UP:
            return mOrientation == VERTICAL ? LayoutState.LAYOUT_START
                    : LayoutState.INVALID_LAYOUT;
        case View.FOCUS_DOWN:
            return mOrientation == VERTICAL ? LayoutState.LAYOUT_END
                    : LayoutState.INVALID_LAYOUT;
        case View.FOCUS_LEFT:
            return mOrientation == HORIZONTAL ? LayoutState.LAYOUT_START
                    : LayoutState.INVALID_LAYOUT;
        case View.FOCUS_RIGHT:
            return mOrientation == HORIZONTAL ? LayoutState.LAYOUT_END
                    : LayoutState.INVALID_LAYOUT;
        default:
            if (DEBUG) {
                Log.d(TAG, "Unknown focus request:" + focusDirection);
            }
            return LayoutState.INVALID_LAYOUT;
    }

}
 
Example 11
Source File: LinearLayoutManager.java    From ExRecyclerViewLibrary with Apache License 2.0 5 votes vote down vote up
/**
 * Converts a focusDirection to orientation.
 *
 * @param focusDirection One of {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN},
 *                       {@link View#FOCUS_LEFT}, {@link View#FOCUS_RIGHT},
 *                       {@link View#FOCUS_BACKWARD}, {@link View#FOCUS_FORWARD}
 *                       or 0 for not applicable
 * @return {@link RenderState#LAYOUT_START} or {@link RenderState#LAYOUT_END} if focus direction
 * is applicable to current state, {@link RenderState#INVALID_LAYOUT} otherwise.
 */
private int convertFocusDirectionToLayoutDirection(int focusDirection) {
    switch (focusDirection) {
        case View.FOCUS_BACKWARD:
            return RenderState.LAYOUT_START;
        case View.FOCUS_FORWARD:
            return RenderState.LAYOUT_END;
        case View.FOCUS_UP:
            return mOrientation == VERTICAL ? RenderState.LAYOUT_START
                    : RenderState.INVALID_LAYOUT;
        case View.FOCUS_DOWN:
            return mOrientation == VERTICAL ? RenderState.LAYOUT_END
                    : RenderState.INVALID_LAYOUT;
        case View.FOCUS_LEFT:
            return mOrientation == HORIZONTAL ? RenderState.LAYOUT_START
                    : RenderState.INVALID_LAYOUT;
        case View.FOCUS_RIGHT:
            return mOrientation == HORIZONTAL ? RenderState.LAYOUT_END
                    : RenderState.INVALID_LAYOUT;
        default:
            if (DEBUG) {
                Log.d(TAG, "Unknown focus request:" + focusDirection);
            }
            return RenderState.INVALID_LAYOUT;
    }

}
 
Example 12
Source File: LinearLayoutManager.java    From TelePlus-Android with GNU General Public License v2.0 5 votes vote down vote up
/**
 * Converts a focusDirection to orientation.
 *
 * @param focusDirection One of {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN},
 *                       {@link View#FOCUS_LEFT}, {@link View#FOCUS_RIGHT},
 *                       {@link View#FOCUS_BACKWARD}, {@link View#FOCUS_FORWARD}
 *                       or 0 for not applicable
 * @return {@link LayoutState#LAYOUT_START} or {@link LayoutState#LAYOUT_END} if focus direction
 * is applicable to current state, {@link LayoutState#INVALID_LAYOUT} otherwise.
 */
int convertFocusDirectionToLayoutDirection(int focusDirection) {
    switch (focusDirection) {
        case View.FOCUS_BACKWARD:
            if (mOrientation == VERTICAL) {
                return LayoutState.LAYOUT_START;
            } else if (isLayoutRTL()) {
                return LayoutState.LAYOUT_END;
            } else {
                return LayoutState.LAYOUT_START;
            }
        case View.FOCUS_FORWARD:
            if (mOrientation == VERTICAL) {
                return LayoutState.LAYOUT_END;
            } else if (isLayoutRTL()) {
                return LayoutState.LAYOUT_START;
            } else {
                return LayoutState.LAYOUT_END;
            }
        case View.FOCUS_UP:
            return mOrientation == VERTICAL ? LayoutState.LAYOUT_START
                    : LayoutState.INVALID_LAYOUT;
        case View.FOCUS_DOWN:
            return mOrientation == VERTICAL ? LayoutState.LAYOUT_END
                    : LayoutState.INVALID_LAYOUT;
        case View.FOCUS_LEFT:
            return mOrientation == HORIZONTAL ? LayoutState.LAYOUT_START
                    : LayoutState.INVALID_LAYOUT;
        case View.FOCUS_RIGHT:
            return mOrientation == HORIZONTAL ? LayoutState.LAYOUT_END
                    : LayoutState.INVALID_LAYOUT;
        default:
            if (DEBUG) {
                Log.d(TAG, "Unknown focus request:" + focusDirection);
            }
            return LayoutState.INVALID_LAYOUT;
    }

}
 
Example 13
Source File: ScrollView.java    From android_9.0.0_r45 with Apache License 2.0 5 votes vote down vote up
/**
 * When looking for focus in children of a scroll view, need to be a little
 * more careful not to give focus to something that is scrolled off screen.
 *
 * This is more expensive than the default {@link android.view.ViewGroup}
 * implementation, otherwise this behavior might have been made the default.
 */
@Override
protected boolean onRequestFocusInDescendants(int direction,
        Rect previouslyFocusedRect) {

    // convert from forward / backward notation to up / down / left / right
    // (ugh).
    if (direction == View.FOCUS_FORWARD) {
        direction = View.FOCUS_DOWN;
    } else if (direction == View.FOCUS_BACKWARD) {
        direction = View.FOCUS_UP;
    }

    final View nextFocus = previouslyFocusedRect == null ?
            FocusFinder.getInstance().findNextFocus(this, null, direction) :
            FocusFinder.getInstance().findNextFocusFromRect(this,
                    previouslyFocusedRect, direction);

    if (nextFocus == null) {
        return false;
    }

    if (isOffScreen(nextFocus)) {
        return false;
    }

    return nextFocus.requestFocus(direction, previouslyFocusedRect);
}
 
Example 14
Source File: HorizontalScrollView.java    From android_9.0.0_r45 with Apache License 2.0 5 votes vote down vote up
/**
 * When looking for focus in children of a scroll view, need to be a little
 * more careful not to give focus to something that is scrolled off screen.
 *
 * This is more expensive than the default {@link android.view.ViewGroup}
 * implementation, otherwise this behavior might have been made the default.
 */
@Override
protected boolean onRequestFocusInDescendants(int direction,
        Rect previouslyFocusedRect) {

    // convert from forward / backward notation to up / down / left / right
    // (ugh).
    if (direction == View.FOCUS_FORWARD) {
        direction = View.FOCUS_RIGHT;
    } else if (direction == View.FOCUS_BACKWARD) {
        direction = View.FOCUS_LEFT;
    }

    final View nextFocus = previouslyFocusedRect == null ?
            FocusFinder.getInstance().findNextFocus(this, null, direction) :
            FocusFinder.getInstance().findNextFocusFromRect(this,
                    previouslyFocusedRect, direction);

    if (nextFocus == null) {
        return false;
    }

    if (isOffScreen(nextFocus)) {
        return false;
    }

    return nextFocus.requestFocus(direction, previouslyFocusedRect);
}
 
Example 15
Source File: GridLayoutManager.java    From TvRecyclerView with Apache License 2.0 5 votes vote down vote up
private boolean gridOnRequestFocusInDescendantsUnaligned(RecyclerView recyclerView,
                                                         int direction, Rect previouslyFocusedRect) {
    // focus to view not overlapping padding area to avoid scrolling in gaining focus
    int index;
    int increment;
    int end;
    int count = getChildCount();
    if ((direction & View.FOCUS_FORWARD) != 0) {
        index = 0;
        increment = 1;
        end = count;
    } else {
        index = count - 1;
        increment = -1;
        end = -1;
    }
    int left = getPaddingLow();
    int right = getClientSize() + left;
    for (int i = index; i != end; i += increment) {
        View child = getChildAt(i);
        if (child.getVisibility() == View.VISIBLE) {
            if (getViewMin(child) >= left && getViewMax(child) <= right) {
                if (child.requestFocus(direction, previouslyFocusedRect)) {
                    return true;
                }
            }
        }
    }
    return false;
}
 
Example 16
Source File: ZrcAbsListView.java    From ZrcListView with MIT License 4 votes vote down vote up
static int getDistance(Rect source, Rect dest, int direction) {
	int sX, sY;
	int dX, dY;
	switch (direction) {
	case View.FOCUS_RIGHT:
		sX = source.right;
		sY = source.top + source.height() / 2;
		dX = dest.left;
		dY = dest.top + dest.height() / 2;
		break;
	case View.FOCUS_DOWN:
		sX = source.left + source.width() / 2;
		sY = source.bottom;
		dX = dest.left + dest.width() / 2;
		dY = dest.top;
		break;
	case View.FOCUS_LEFT:
		sX = source.left;
		sY = source.top + source.height() / 2;
		dX = dest.right;
		dY = dest.top + dest.height() / 2;
		break;
	case View.FOCUS_UP:
		sX = source.left + source.width() / 2;
		sY = source.top;
		dX = dest.left + dest.width() / 2;
		dY = dest.bottom;
		break;
	case View.FOCUS_FORWARD:
	case View.FOCUS_BACKWARD:
		sX = source.right + source.width() / 2;
		sY = source.top + source.height() / 2;
		dX = dest.left + dest.width() / 2;
		dY = dest.top + dest.height() / 2;
		break;
	default:
		throw new IllegalArgumentException("direction must be one of "
				+ "{FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, "
				+ "FOCUS_FORWARD, FOCUS_BACKWARD}.");
	}
	int deltaX = dX - sX;
	int deltaY = dY - sY;
	return deltaY * deltaY + deltaX * deltaX;
}
 
Example 17
Source File: TwoWayGridView.java    From recent-images with MIT License 4 votes vote down vote up
/**
 * Is childIndex a candidate for next focus given the direction the focus
 * change is coming from?
 * @param childIndex The index to check.
 * @param direction The direction, one of
 *        {FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT}
 * @return Whether childIndex is a candidate.
 */
@Override
protected boolean isCandidateSelection(int childIndex, int direction) {
	final int count = getChildCount();
	final int invertedIndex = count - 1 - childIndex;
	final int numRows = mNumRows;

	int columnStart;
	int columnEnd;

	if (!mStackFromBottom) {
		columnStart = childIndex - (childIndex % numRows);
		columnEnd = Math.max(columnStart + numRows - 1, count);
	} else {
		columnEnd = count - 1 - (invertedIndex - (invertedIndex % numRows));
		columnStart = Math.max(0, columnEnd - numRows + 1);
	}

	switch (direction) {
	case View.FOCUS_RIGHT:
		// coming from left, selection is only valid if it is on left
		// edge
		return childIndex == columnStart;
	case View.FOCUS_DOWN:
		// coming from top; only valid if in top row
		return columnStart == 0;
	case View.FOCUS_LEFT:
		// coming from right, must be on right edge
		return childIndex == columnStart;
	case View.FOCUS_UP:
		// coming from bottom, need to be in last row
		return columnStart == count - 1;
	case View.FOCUS_FORWARD:
		// coming from top-left, need to be first in top row
		return childIndex == columnStart && columnStart == 0;
	case View.FOCUS_BACKWARD:
		// coming from bottom-right, need to be last in bottom row
		return childIndex == columnEnd && columnEnd == count - 1;
	default:
		throw new IllegalArgumentException("direction must be one of "
				+ "{FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, "
				+ "FOCUS_FORWARD, FOCUS_BACKWARD}.");

	}
}
 
Example 18
Source File: TwoWayGridView.java    From recent-images with MIT License 4 votes vote down vote up
/**
 * Is childIndex a candidate for next focus given the direction the focus
 * change is coming from?
 * @param childIndex The index to check.
 * @param direction The direction, one of
 *        {FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT}
 * @return Whether childIndex is a candidate.
 */
@Override
protected boolean isCandidateSelection(int childIndex, int direction) {
	final int count = getChildCount();
	final int invertedIndex = count - 1 - childIndex;

	int rowStart;
	int rowEnd;

	if (!mStackFromBottom) {
		rowStart = childIndex - (childIndex % mNumColumns);
		rowEnd = Math.max(rowStart + mNumColumns - 1, count);
	} else {
		rowEnd = count - 1 - (invertedIndex - (invertedIndex % mNumColumns));
		rowStart = Math.max(0, rowEnd - mNumColumns + 1);
	}

	switch (direction) {
	case View.FOCUS_RIGHT:
		// coming from left, selection is only valid if it is on left
		// edge
		return childIndex == rowStart;
	case View.FOCUS_DOWN:
		// coming from top; only valid if in top row
		return rowStart == 0;
	case View.FOCUS_LEFT:
		// coming from right, must be on right edge
		return childIndex == rowEnd;
	case View.FOCUS_UP:
		// coming from bottom, need to be in last row
		return rowEnd == count - 1;
	case View.FOCUS_FORWARD:
		// coming from top-left, need to be first in top row
		return childIndex == rowStart && rowStart == 0;
	case View.FOCUS_BACKWARD:
		// coming from bottom-right, need to be last in bottom row
		return childIndex == rowEnd && rowEnd == count - 1;
	default:
		throw new IllegalArgumentException("direction must be one of "
		  + "{FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, "
		  + "FOCUS_FORWARD, FOCUS_BACKWARD}");
	}
}
 
Example 19
Source File: GridView.java    From android_9.0.0_r45 with Apache License 2.0 4 votes vote down vote up
/**
 * Is childIndex a candidate for next focus given the direction the focus
 * change is coming from?
 * @param childIndex The index to check.
 * @param direction The direction, one of
 *        {FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, FOCUS_BACKWARD}
 * @return Whether childIndex is a candidate.
 */
private boolean isCandidateSelection(int childIndex, int direction) {
    final int count = getChildCount();
    final int invertedIndex = count - 1 - childIndex;

    int rowStart;
    int rowEnd;

    if (!mStackFromBottom) {
        rowStart = childIndex - (childIndex % mNumColumns);
        rowEnd = Math.min(rowStart + mNumColumns - 1, count);
    } else {
        rowEnd = count - 1 - (invertedIndex - (invertedIndex % mNumColumns));
        rowStart = Math.max(0, rowEnd - mNumColumns + 1);
    }

    switch (direction) {
        case View.FOCUS_RIGHT:
            // coming from left, selection is only valid if it is on left
            // edge
            return childIndex == rowStart;
        case View.FOCUS_DOWN:
            // coming from top; only valid if in top row
            return rowStart == 0;
        case View.FOCUS_LEFT:
            // coming from right, must be on right edge
            return childIndex == rowEnd;
        case View.FOCUS_UP:
            // coming from bottom, need to be in last row
            return rowEnd == count - 1;
        case View.FOCUS_FORWARD:
            // coming from top-left, need to be first in top row
            return childIndex == rowStart && rowStart == 0;
        case View.FOCUS_BACKWARD:
            // coming from bottom-right, need to be last in bottom row
            return childIndex == rowEnd && rowEnd == count - 1;
        default:
            throw new IllegalArgumentException("direction must be one of "
                    + "{FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, "
                    + "FOCUS_FORWARD, FOCUS_BACKWARD}.");
    }
}
 
Example 20
Source File: ZrcAbsListView.java    From AndroidStudyDemo with GNU General Public License v2.0 4 votes vote down vote up
static int getDistance(Rect source, Rect dest, int direction) {
    int sX, sY;
    int dX, dY;
    switch (direction) {
    case View.FOCUS_RIGHT:
        sX = source.right;
        sY = source.top + source.height() / 2;
        dX = dest.left;
        dY = dest.top + dest.height() / 2;
        break;
    case View.FOCUS_DOWN:
        sX = source.left + source.width() / 2;
        sY = source.bottom;
        dX = dest.left + dest.width() / 2;
        dY = dest.top;
        break;
    case View.FOCUS_LEFT:
        sX = source.left;
        sY = source.top + source.height() / 2;
        dX = dest.right;
        dY = dest.top + dest.height() / 2;
        break;
    case View.FOCUS_UP:
        sX = source.left + source.width() / 2;
        sY = source.top;
        dX = dest.left + dest.width() / 2;
        dY = dest.bottom;
        break;
    case View.FOCUS_FORWARD:
    case View.FOCUS_BACKWARD:
        sX = source.right + source.width() / 2;
        sY = source.top + source.height() / 2;
        dX = dest.left + dest.width() / 2;
        dY = dest.top + dest.height() / 2;
        break;
    default:
        throw new IllegalArgumentException("direction must be one of "
                + "{FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, " +
                "FOCUS_FORWARD, FOCUS_BACKWARD}.");
    }
    int deltaX = dX - sX;
    int deltaY = dY - sY;
    return deltaY * deltaY + deltaX * deltaX;
}