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Here is a possible way to match java canvas and cocoa nsview
I use that technique in gl4java's MAC OS X
(JDK 1.4.1) implementation.
1. we need to find location of the canvas relative to the top frame
maybe there is a shorter way I'd be very graceful if somebody can show me that shorter way.
Component component = c;//canvas
Point globalLocation = component.getLocation();
while(!(component instanceof Frame) && component != null){
component = component.getParent();
if(component != null && !(component instanceof Frame)){
globalLocation.x+=component.getLocation().x;
globalLocation.y+=component.getLocation().y;
}
}
if(component instanceof Frame){
Frame frame = (Frame)component;
Insets insets = frame.getInsets();
if(insets != null){
globalLocation.y -= (insets.top + insets.bottom);
globalLocation.x -= (insets.left + insets.right);
}
}
so after that manipulation we have relative coordinate of our canvas to the top frame.
2. now we have to find NSView with the same location and size in the contentView view hierarchy
(contentView could be obtained from JAWT via cocoaViewRef)
NSView *findAppropriateView(NSView *contentView,NSRect needRect)
{
NSView *finalView = NULL;
NSRect contentViewBound = [contentView bounds];
int titleHeight = contentViewBound.origin.y;
NSRect viewRect = NSOffsetRect (needRect , 0 , titleHeight);
finalView = findSubView(contentView,contentView,viewRect);
return finalView;
}
NSView *findSubView(NSView *contentView,NSView *view,NSRect viewRect){
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSView *retView = nil;
NSArray *subviews = [view subviews];
int i=0;
if(subviews != NULL){
int count = [subviews count];
for(i = 0; i < count; i++){
id object = [subviews objectAtIndex:i];
if ( [object isKindOfClass:[NSView class]] ){
NSView *subView = (NSView *)object;
if([[subView subviews] count] == 0){
NSRect subViewRect = [contentView convertRect : [subView frame] fromView : [subView superview]];
if(NSEqualRects(subViewRect,viewRect)){
retView = subView;
}
}else{
retView=findSubView(contentView,subView,viewRect);
}
if(retView != nil) break;
}
}
}
[pool release];
return retView;
}
NSRect GetViewRect(JNIEnv *env,jobject component,int xoffset,int yoffset)
{
NSRect viewRect;
Rect compBound;
GetComponentBounds(env, component,&compBound);
OffsetRect(&compBound, xoffset - compBound.left, yoffset - compBound.top);
viewRect = NSMakeRect(compBound.left,compBound.top,compBound.right - compBound.left,compBound.bottom - compBound.top);
return viewRect;
}
void GetComponentBounds(JNIEnv *env, jobject component,Rect *rect){
if(env == NULL || component == NULL) return;
rect->left = rect->top = rect->right = rect->bottom = 0;
jclass clazz = (*env)->GetObjectClass(env,component);
if(clazz == NULL) return;
jmethodID mID = (*env)->GetMethodID(env,clazz,"getBounds",JRISigMethod(JRISigNoArgs) JRISigClass("java/awt/Rectangle"));
if(mID == 0) return;
jobject rectangle = (*env)->CallObjectMethod(env,component,mID);
if(rectangle != NULL){
int width = 0,height = 0;
jclass rclazz = (*env)->GetObjectClass(env,rectangle);
if(rclazz == NULL) return;
jfieldID fieldID = (*env)->GetFieldID(env,rclazz,"x",JRISigInt);
if(fieldID != NULL){
rect->left = (short)(*env)->GetIntField(env,rectangle,fieldID);
}
fieldID = (*env)->GetFieldID(env,rclazz,"y",JRISigInt);
if(fieldID != NULL){
rect->top = (short)(*env)->GetIntField(env,rectangle,fieldID);
}
fieldID = (*env)->GetFieldID(env,rclazz,"width",JRISigInt);
if(fieldID != NULL){
width = (short)(*env)->GetIntField(env,rectangle,fieldID);
}
fieldID = (*env)->GetFieldID(env,rclazz,"height",JRISigInt);
if(fieldID != NULL){
height = (short)(*env)->GetIntField(env,rectangle,fieldID);
}
rect->right = rect->left + width;
rect->bottom = rect->top + height;
}
}
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