mechanismwhen we touch the Android phone screen with our fingers, we create a touch event, but how does the touch event get distributed at the bottom? I really don't know, it involves the knowledge of the operation of the hardware (mobile screen), that is, the Linux kernel knowledge, I did not understand this aspect, so we may go to the top to analyze, we know that Android is responsible for interacting with the user, One of the four components closely related to user action is activity, so we
element's focus obj.select () selects the text contents of the specified element selected Is the user input content, the contents of the DIV is not an event object, when an event occurs, some detailed information about the event that occurs with the current object will be temporarily saved to a specified place-event object, for us to call in the need. Aircraft-black Box The event object must be used in a function called by an event to have a content event function: The function called by the ev
Native JavaScript compatibility: Currentstyle, ScrollTop, event, and binding event IE binding events for the attachevent/detachevent and so on compatibility test examples, interested friends can refer to ha
1. Get the Width,border color of the style sheet CSS (not between rows) is mainly ie6-7 support Currentstyle, standard browser support getComputedStyle;Instances: Encapsulating functions
Copy Code code as follows:
function GetStyle (obj,name) {
if (obj.currentstyle) {
return obj.curre
1. Get the Width,border color of the style sheet CSS (not between rows) is mainly ie6-7 support Currentstyle, standard browser support getComputedStyle;
Instances: Encapsulating functions
Copy Code code as follows:
function GetStyle (obj,name) {
if (Obj.currentstyle) {
return Obj.currentstyle[name];
}
else{
Return getComputedStyle (Obj,false) [name];
}
}
Call: GetStyle (' color ');
2. Get the scrolling distance
DOCUMENT.BODY.SCROLLTOP applies to standard b
= container.getchildat (0);
Mcontentview = Container.getchildat (1);
3. Specify the width of the content and menu layout//3.1 Menu width = width of the screen-the width mmenuview.getlayoutparams () on the right side of the custom. Width = mmenuwidth;
3.2 width of the content = width of the screen mcontentview.getlayoutparams (). Width = Getscreenwidth (); @Override public boolean ontouchevent (motionevent ev) {//Handle finger fast sliding if (mge
the ev_watcher struct can be considered as the base class for all ev_type structures, which contains the same fields in all Ev_type.
These structures are defined in the code as follows, and I have restored some of the macros for ease of understanding. Only partial macros are restored, not all, because these macros embody the idea of the author designing these structures.
Related macros
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This macro defines all parts of the Ev_type beginning
#define Ev_watcher
variables have the following meanings:
FD: Event-related device handle. The most important is the socket file handle between Rilj and RILCPersist: Indicates that the current event needs to be persisted and cannot be removed from watch_tableFunc: handler function for the current eventParam: Parameters When invoking the current event handler functionNext, before we look at the specific process, let's take a look at what functions are required to process the event:[CPP] The initialization of the v
this article is to customize a viewgroup, wrapped around the original ListView, and placed on this particular interface. Since event distribution is performed at a level, we can override the dispatchtouchevent method of this outer layer of custom ViewGroup to implement an event distribution mechanism that controls all child view This allows us to implement the response mechanism of the touch events we want in this particular interface.Write a custom framelayout called interceptorframelayout, ov
First, Touch incident analysis***************************************************************************************************************Event Distribution: Public boolean dispatchtouchevent (motionevent ev)When the Touch event occurs, the Dispatchtouchevent (motionevent ev) method of the Activity passes the event to the outermost layer by tunneling (passing from the root element down to the topmost chi
is agreed.(3) When changes occur, manage these actual changes.(4) To ensure that the potential cost overruns do not exceed the authorized project stage funds and overall funds.(5) Supervise the implementation of the cost (performance) to find deviations from the cost benchmark.(6) Accurately record all the deviations of the cost benchmark.(7) Prevent erroneous, inappropriate or unapproved changes from being included in the cost or Resource Usage report.(8) Notify the project stakeholders of cha
); if (Ngx_event_timer_mutex = = NULL) { return ngx_error; } #endif return NGX_OK;}Timeout detection for timed eventsWhen a time-out detection is required for an event, it is only necessary to add the event to the timer red-black tree, which is ngx_event_add_timerby the function and removes an event from the timer red-black tree by the function Ngx_event_del_ Timer implementation. The following functions are defined in the file src/event/ngx_event_timer.h :/* Remove event from ti
) { /* fatal */ exit(2); } }}
3. disable the socket that is not used. Disable the channel [0] handle of the current worker and the Channel [1] Handle of other workers. The current worker uses the channel [0] Handle of other workers to send messages, use the channel [1] handle of the current worker to listen for readable events:
Src/OS/Unix/ngx_process_cycle.cfor (n = 0; n
4. Listen for readable events in the Channel [1] handle of the current worker:
if (ngx_ad
, all the events of the component must be handled by ourselves. In this case, we also need to handle the event. therefore: because of the two situations mentioned above, we have to handle the event on our own.
2. with the motivation to process events, we need to understand how the android system handles complex events. the android system provides three related methods for all events. The following uses Touch events as an example to describe.
The three methods are:
DispatchTouchEvent (MotionEvent
Android development-touch Event Processing MechanismAndroid touch message transmission mechanismEach user touch (onClick, onLongClick, onScroll, etc .) it is composed of one ACTION_DOWN + n ACTION_MOVE + 1 ACTION_UP. A user must first have an ACTION_DOWN response when touching the user, and there must be an ACTION_UP when touching the user. (Of course, if it is intercepted on the way, it may not exist !) So how does View distribute messages and intercept messages?1. View and its subclass have tw
course, this is compatible, Standard browser with Ev.target,ie browser with Event.srcelement, at this time just get the position of the current node, do not know what node name, here we use nodename to get exactly what tag name, this return is a uppercase, we need to turn to lowercase to do comparison (habit problem):Window.onload = function () {var Oul = document.getElementById ("Ul1");Oul.onclick = function (EV) {var
action occurs, the event is first passed to the current activity, and the event is dispatched by the activity's dispatchtouchevent. The specific work is done by the window within the activity. Window passes the event to Decorview,decorview, which is typically the underlying container of the current interface, which is the parent container of the view set by Setcontentview, through Activity.getwindow (). Getdecorview () can be obtained. We start with an analysis of the dispatchtouchevent of acti
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