int main (int argc, const char * argv[]) { uint32_t displayCount; CGGetActiveDisplayList(0, NULL, &displayCount); if (displayCount != 2) { fprintf(stderr, "Error: expected exactly 2 displays, %d found\n", displayCount); exit(1); } CGDirectDisplayID activeDisplays[displayCount]; CGGetActiveDisplayList(displayCount, activeDisplays, &displayCount); const int32_t xTranslation = -CGRectGetMinX(CGDisplayBounds(activeDisplays[1])); CGDisplayConfigRef config; CGBeginDisplayConfiguration(&config); CGConfigureDisplayFadeEffect(config, 0.2, 0.2, 0, 0, 0); for (int i = 0; i < displayCount; ++i) { CGDirectDisplayID display = activeDisplays[i]; CGRect displayBounds = CGDisplayBounds(display); CGConfigureDisplayOrigin(config, display, CGRectGetMinX(displayBounds) + xTranslation, CGRectGetMinY(displayBounds)); } CGCompleteDisplayConfiguration(config, kCGConfigurePermanently); return 0; }
void setMainDisplay(CGDirectDisplayID targetDisplay) { int deltaX, deltaY, flag; CGDisplayErr dErr; CGDisplayCount displayCount, i; CGDirectDisplayID mainDisplay; CGDisplayCount maxDisplays = MAX_DISPLAYS; CGDirectDisplayID onlineDisplays[MAX_DISPLAYS]; CGDisplayConfigRef config; mainDisplay = CGMainDisplayID(); if (mainDisplay == targetDisplay) { exit(0); } dErr = CGGetOnlineDisplayList(maxDisplays, onlineDisplays, &displayCount); if (dErr != kCGErrorSuccess) { fprintf(stderr, "CGGetOnlineDisplayList: error %d.\n", dErr); exit(1); } flag = 0; for (i = 0; i < displayCount; i++) { CGDirectDisplayID dID = onlineDisplays[i]; if (dID == targetDisplay) { flag = 1; } } if (flag == 0) { fprintf(stderr, "No such display ID: %10p.\n", targetDisplay); exit(1); } deltaX = -CGRectGetMinX (CGDisplayBounds (targetDisplay)); deltaY = -CGRectGetMinY (CGDisplayBounds (targetDisplay)); CGBeginDisplayConfiguration (&config); for (i = 0; i < displayCount; i++) { CGDirectDisplayID dID = onlineDisplays[i]; CGConfigureDisplayOrigin (config, dID, CGRectGetMinX (CGDisplayBounds (dID)) + deltaX, CGRectGetMinY (CGDisplayBounds (dID)) + deltaY ); } CGCompleteDisplayConfiguration (config, kCGConfigureForSession); exit(0); }