当使用同一窗口上的另一个控件时，是否可以重绘自定义NSView？ [英] Can I redraw a custom NSView while another control on the same window is being used?

问题描述

在程序中，我正在执行大量的数据处理，并希望能够绘制一个自定义的NSView来直观地表示这个过程。

In a program I am working on I am performing a large amount of data crunching, and want to be able draw a custom NSView to represent the process visually.

通过使用GCD（使用dispatch_sync作为需要保存的顺序），在主线程上处理数据处理：

The data crunching is processed off the main thread by using GCD (using dispatch_sync as the order needs to be preserved):

for (int i=0; i<iterations; i++) {

    dispatch_sync(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        // Add a data crunching task to the queue!
    });
}

当处理开始时，我初始化一个定时器，自定义显示以定期重绘（此计时器在所有处理任务完成后失效）：

When the processing is started I initialise a timer, which is used to ask the custom display to redraw at regular intervals (this timer is invalidated once all of the processing tasks are completed):

-(void)onTick:(NSTimer *)timer {

    [_customView setNeedsDisplay:YES];
    // Update some other UI object (labels etc.)    
}

我有这个工作按预期，但是我注意到现在的唯一问题是，如果我做一些事情像点击并按住同一个窗口上的按钮，或开始拖动滑块，而进程正在进行，重新绘制自定义视图阻止，直到我放开鼠标！

I have this working as expected, however the only problem I notice now is that if I do something like click and hold on a button on the same window, or begin dragging a slider while the process is going on, the redrawing of the custom view is prevented until I let go of the mouse!

有没有办法，我可以防止这种情况发生，最好不要将所有的控制移动到一个单独的窗口！ p>

Is there any way I can prevent this from happening, preferably without moving all of the controls onto a separate window!

推荐答案

yip的定时器是在runloop上，而在拖放/跟踪模式下，它不会被触发，因为runloop is not advanced共同模式

yip the timer is on the runloop and while in the drag drop / tracking mode it doesnt get fired because the runloop isnt advanced for the common mode

将其添加到所需的模式：

add it to the modes needed:

NSRunLoop *runloop = [NSRunLoop currentRunLoop];
NSTimer *timer = [NSTimer timerWithTimeInterval:0.1 target:self selector:@selector(myTimerAction:) userInfo:nil repeats:YES];
[runloop addTimer:timer forMode:NSRunLoopCommonModes];
[runloop addTimer:timer forMode: NSEventTrackingRunLoopMode];

编辑：runloop基本上是apple的while循环，用于向应用程序分派ANY事件。并根据所谓的模式过滤其分派的事件。

edit: the runloop is basically apple's while loop for dispatch ANY event to an app. and it filters the events it dispatches based on so called modes.

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