当我使用 NSOpenGLView 创建基于文档的 Xcode 项目时，我遇到了一个奇怪的问题。该应用程序适用于单个文档，响应鼠标点击。当您选择文件/新建打开第二个文档时，顶部会出现一个新的前窗口，但鼠标单击会发送到前一个（背景）对象。您可以移动新窗口，点击仍会发送到前一个对象。但是，如果您调整新窗口的大小或在前一个窗口中来回单击，则一切正常。所以问题似乎是新的（前）窗口没有成为活动上下文。你能提出一个解决方案吗？我已将 Xcode 4.4 代码 (44kb) 放在http://www.mccauslandcenter.sc.edu/CRNL/sw/GLdoc.zip。
- 创建一个新的基于文档的应用程序
- 将 MyOpenGLView.m 和 MyOpenGLView.h 文件添加到项目中
- 对于 Targets/BuildPhases，将 OpenGL.framework 添加到“Link Binary With Libraries”
- 对于 Targets/BuildPhases，将 MyOpenGLView.m 添加到“Compile Sources”
- 在界面生成器中 a.) 选择 Document's Window 并在属性检查器中关闭“One shot” b.) 从对象库中添加一个 OpenGL 视图 c.) 使用身份检查器，将新创建的 NSOpenGLView 的类设置为 MyOpenGLView
- 运行项目
----开始我的OpenGLView.h
#import <Cocoa/Cocoa.h>
#import <GLUT/GLUT.h>
@interface MyOpenGLView : NSOpenGLView
{
NSTimer* timer; //animation timer
NSPoint mouseloc;
NSPoint screenSize;
int hourglassSize;
BOOL updateGL;
}
@end
----START MyOpenGLView.m
// document based OpenGL application inspired by http://www.alecjacobson.com/weblog/?p=2110
#import "MyOpenGLView.h"
@implementation MyOpenGLView
-(void)prepareOpenGL
{
//NSLog(@"preparing");
}
- (void)reshape
{
//NSLog(@"reshaping");
NSRect rectView = [self bounds];
screenSize.x = rectView.size.width;
screenSize.y = rectView.size.height;
}
void enter2D (int width, int height) //Enter2D = reshapeGL
{
glDisable(GL_DEPTH_TEST);
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, width, 0, height,-1,1); //map view to match pixel size, e.g. gluOrtho2D(0, width, 0, height);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glEnable (GL_BLEND); //allow transparent objects
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
void drawTriangle (int sz, int left, int bottom)
{
glLoadIdentity ();
glTranslatef(left,bottom,0.0f);
glBegin(GL_TRIANGLES);
glVertex3f( sz/2, sz, 0.0f);// Top
glVertex3f(0.0,0.0, 0.0); // Bottom Left
glVertex3f( sz,0.0f, 0.0f); // Bottom Right
glEnd(); // Finished Drawing The Triangle
}
void drawHourGlass (int sz, NSPoint center)
{
glLoadIdentity ();
glTranslatef(center.x,center.y,0.0f);
glBegin(GL_TRIANGLES); //lower triangle
glVertex3f( 0.0, 0.0, 0.0f); // Top
glVertex3f(-sz,-sz, 0.0);// Bottom Left
glVertex3f( sz,-sz, 0.0f);// Bottom Right
glEnd();
glBegin(GL_TRIANGLES); //upper triangle
glVertex3f( 0.0, 0.0, 0.0f); // bottom
glVertex3f(-sz,sz, 0.0);// Top Left
glVertex3f( sz,sz, 0.0f);// Top Right
glEnd();
}
-(void)drawRect:(NSRect)rect
{
updateGL = FALSE;
//NSLog(@" %f %f",rect.size.width,rect.size.height);
enter2D(screenSize.x,screenSize.y);
glClearColor(0.8,0.9,1,1); //background - blue sky
glClear(GL_COLOR_BUFFER_BIT);
glColor4f(0.6,0.3,0.1,1.0); //mountains - brown opaque
drawTriangle(100,10,0);
drawTriangle(70,80,0);
glColor4f(0.1,0.1,0.1,0.7); //crosshair - gray, slightly translucent
drawHourGlass (hourglassSize, mouseloc);
glFlush(); // Flush all OpenGL calls
}
- (void)mouseDown:(NSEvent *)event
{
mouseloc = [self convertPoint:[event locationInWindow] fromView:nil];
updateGL = TRUE;
}
int constrain (int size)
{
if (size < 5)
return 5;
else if (size > 50)
return 50;
else
return size;
}
- (void) magnifyWithEvent:(NSEvent *)event;
{
if ([event magnification] > 0)
hourglassSize = hourglassSize + 5;
else
hourglassSize = hourglassSize - 5;
hourglassSize = constrain(hourglassSize);
updateGL = TRUE;
}
- (void)scrollWheel:(NSEvent *)event
{
if (event.deltaY < 0)
hourglassSize = hourglassSize + 5;
if (event.deltaY > 0)
hourglassSize = hourglassSize - 5;
hourglassSize = constrain(hourglassSize);
updateGL = TRUE;
}
- (void)animationTimer:(NSTimer *)timer
{
if (updateGL == TRUE)
[self drawRect:[self bounds]];
}
-(BOOL)acceptsFirstResponder { return YES; }
-(BOOL)becomeFirstResponder { return YES; }
-(BOOL)resignFirstResponder { return YES; }
- (void) awakeFromNib
{
// [[self window] setAcceptsMouseMovedEvents:YES];
mouseloc.x = 30;
mouseloc.y = 40;
hourglassSize = 30;
timer = [NSTimer timerWithTimeInterval:(1.0f/60.0f) target:self selector:@selector(animationTimer:) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
// ensure timer fires during resize
[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSEventTrackingRunLoopMode];
updateGL = TRUE;
}
@end