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我目前正在嘗試以編程方式創建一個簡單的可可NSWindow,而不是使用接口生成器(我有我的理由這樣做)。這是一個快速測試:NSOpenGLView drawRect不會被調用
int main(int argc, char** argv){
NSWindow *mainwin;
CocoaGLView *mainview;
NSRect scr_frame;
unsigned int style_mask;
NSAutoreleasePool *pool =[[NSAutoreleasePool alloc] init];
[NSApplication sharedApplication];
scr_frame= NSMakeRect(100, 100, 400, 400);
style_mask=NSClosableWindowMask|NSMiniaturizableWindowMask|
NSResizableWindowMask|NSTitledWindowMask;
scr_frame=[NSWindow contentRectForFrameRect:scr_frame
styleMask:style_mask];
mainwin=[[NSWindow alloc]
initWithContentRect:scr_frame
styleMask:style_mask
backing:NSBackingStoreBuffered
defer:NO];
[mainwin makeKeyAndOrderFront:nil];
[mainwin setTitle:@"Visible screen window"];
mainview=[[CocoaGLView alloc] initWithFrame:scr_frame];
[mainwin setContentView:mainview];
[mainview display];
[mainwin setReleasedWhenClosed:YES];
[pool drain];
[NSApp run];
return 0;
}
CocoaGLView從NSOpenGLView衍生,看起來像這樣:
@interface CocoaGLView : NSOpenGLView {
//some stuff
}
- (id) initWithFrame: (NSRect) frameRect;
- (void)setFrameSize:(NSSize) aSize;
- (void)drawRect:(NSRect) aRect;
@end
它通常工作。我可以看到窗戶。我甚至可以看到我在CocoaGLViews drawRect函數內繪製的openGL事物,但那個函數不幸只能被調用一次,我錯過了什麼?