keydown 没有被调用-尊龙凯时

问题描述

我有一个名为 surfaceview 的自定义 nsview.它是 nswindow 的 contentview，它处理鼠标点击和绘图等基本事件.但不管我做什么，它不处理 keydown 功能.我已经覆盖了acceptsfirstresponder，但没有任何反应.

i have a custom nsview called surfaceview. it is the contentview of a nswindow and it handles basic events like mouse click and drawing. but don't matters what i do, it does not handle the keydown function. i've already override the acceptsfirstresponder but nothing happens.

如果重要，我会使用自定义 nsevent 循环运行应用程序，如下所示:

if it matters, i run the application using a custom nsevent loop, shown below:

nsdictionary* info = [[nsbundle mainbundle] infodictionary];
nsstring* mainnibname = [info objectforkey:@"n**ainnibfile"];
nsapplication* app = [nsapplication sharedapplication];
nsnib* mainnib = [[nsnib alloc] initwithnibnamed:mainnibname bundle:[nsbundle mainbundle]];
[mainnib instantiatenibwithowner:app toplevelobjects:nil];
[app finishlaunching];
while(true)
{   
    nsevent* event = [app nexteventmatchingmask:nsanyeventmask untildate:[nsdate date] inmode:nsdefaultrunloopmode dequeue:yes];
    [app sendevent:event];
    // some code is execute here every frame to do some tasks...
    usleep(5000);
}

这是 surfaceview 代码:

here's the surfaceview code:

@interface surfaceview : nsview
{
    panel* panel;
}
@property (nonatomic) panel* panel;
- (void)drawrect:(nsrect)dirtyrect;
- (bool)isflipped;
- (void)mousedown:(nsevent *)theevent;
- (void)mousedragged:(nsevent *)theevent;
- (void)mouseup:(nsevent *)theevent;
- (void)keydown:(nsevent *)theevent;
- (bool)acceptsfirstresponder;
- (bool)becomefirstresponder;
@end

--

@implementation surfaceview
@synthesize panel;
- (bool)acceptsfirstresponder
{
    return yes;
};
- (void)keydown:(nsevent *)theevent
{
    // this function is never called
};
...
@end

这是我创建视图的方式:

here's how i create the view:

nswindow* window = [[nswindow alloc] initwithcontentrect:n**akerect(left, top, wide, tall) stylemask:nsborderlesswindowmask | nsclosablewindowmask | n**iniaturizablewindowmask backing:nsbackingstorebuffered defer:no];
...
[window makekeyandorderfront:nil];
surfaceview* mainview = [surfaceview alloc];
[mainview initwithframe:n**akerect(0, 0, wide, tall)];
mainview.panel = panel;
[window setcontentview:mainview];
[window setinitialfirstresponder:mainview];
[window setnextresponder:mainview];
[window makefirstresponder:mainview];

推荐答案

我发现是什么阻止了 keydown 事件被调用.它是 nsborderlesswindowmask 掩码，它防止窗口成为键和主窗口.所以我创建了一个名为 nswindow 的子类 borderlesswindow:

i found out what was preventing the keydown event from being called. it was the nsborderlesswindowmask mask, it prevents the window from become the key and main window. so i have created a subclass of nswindow called borderlesswindow:

@interface borderlesswindow : nswindow
{
}
@end
@implementation borderlesswindow
- (bool)canbecomekeywindow
{
    return yes;
}
- (bool)canbecomemainwindow
{
    return yes;
}
@end