/**

* 包含了方法和标准的常量用来设置UI的超时、大小和距离

*/

public class ViewConfiguration {

    // 设定水平滚动条的宽度和垂直滚动条的高度，单位是像素px

    private static final int SCROLL_BAR_SIZE = ;

    //定义滚动条逐渐消失的时间，单位是毫秒

    private static final int SCROLL_BAR_FADE_DURATION = ;

    // 默认的滚动条多少秒之后消失，单位是毫秒

    private static final int SCROLL_BAR_DEFAULT_DELAY = ;

    // 定义边缘地方褪色的长度

    private static final int FADING_EDGE_LENGTH = ;

    //定义子控件按下状态的持续事件

    private static final int PRESSED_STATE_DURATION = ;

    //定义一个按下状态转变成长按状态的转变时间

    private static final int LONG_PRESS_TIMEOUT = ;

    //定义用户在按住适当按钮，弹出全局的对话框的持续时间

    private static final int GLOBAL_ACTIONS_KEY_TIMEOUT = ;

    //定义一个touch事件中是点击事件还是一个滑动事件所需的时间，如果用户在这个时间之内滑动，那么就认为是一个点击事件

    private static final int TAP_TIMEOUT = ;

    /**

     * Defines the duration in milliseconds we will wait to see if a touch event

     * is a jump tap. If the user does not complete the jump tap within this interval, it is

     * considered to be a tap.

     */

    //定义一个touch事件时候是一个点击事件。如果用户在这个时间内没有完成这个点击，那么就认为是一个点击事件

    private static final int JUMP_TAP_TIMEOUT = ;

    //定义双击事件的间隔时间

    private static final int DOUBLE_TAP_TIMEOUT = ;

    //定义一个缩放控制反馈到用户界面的时间

    private static final int ZOOM_CONTROLS_TIMEOUT = ;

    /**

     * Inset in pixels to look for touchable content when the user touches the edge of the screen

     */

    private static final int EDGE_SLOP = ;

    /**

     * Distance a touch can wander before we think the user is scrolling in pixels

     */

    private static final int TOUCH_SLOP = ;

    /**

     * Distance a touch can wander before we think the user is attempting a paged scroll

     * (in dips)

     */

    private static final int PAGING_TOUCH_SLOP = TOUCH_SLOP * ;

    /**

     * Distance between the first touch and second touch to still be considered a double tap

     */

    private static final int DOUBLE_TAP_SLOP = ;

    /**

     * Distance a touch needs to be outside of a window's bounds for it to

     * count as outside for purposes of dismissing the window.

     */

    private static final int WINDOW_TOUCH_SLOP = ;

   //用来初始化fling的最小速度，单位是每秒多少像素

    private static final int MINIMUM_FLING_VELOCITY = ;

    //用来初始化fling的最大速度，单位是每秒多少像素

    private static final int MAXIMUM_FLING_VELOCITY = ;

    //视图绘图缓存的最大尺寸，以字节表示。在ARGB888格式下，这个尺寸应至少等于屏幕的大小

    @Deprecated

    private static final int MAXIMUM_DRAWING_CACHE_SIZE =  *  * ; // HVGA screen, ARGB8888

    //flings和scrolls摩擦力度大小的系数

    private static float SCROLL_FRICTION = 0.015f;

    /**

     * Max distance to over scroll for edge effects

     */

    private static final int OVERSCROLL_DISTANCE = ;

    /**

     * Max distance to over fling for edge effects

     */

    private static final int OVERFLING_DISTANCE = ;

}