GHOST_WindowViewCocoa.hh

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/* SPDX-FileCopyrightText: 2001-2002 NaN Holding BV. All rights reserved.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
/* The Carbon API is still needed to check if the Input Source (Input Method or IME) is valid. */
#ifdef WITH_INPUT_IME
#  import <Carbon/Carbon.h>
#endif
 
/* NSView subclass for drawing and handling input.
 *
 * COCOA_VIEW_BASE_CLASS will be either NSView or NSOpenGLView depending if
 * we use a Metal or OpenGL layer for drawing in the view. We use macros
 * to defined classes for each case, so we don't have to duplicate code as
 * Objective-C does not have multiple inheritance. */
 
// We need to subclass it in order to give Cocoa the feeling key events are trapped
@interface COCOA_VIEW_CLASS : COCOA_VIEW_BASE_CLASS <NSTextInputClient>
{
  bool composing;
  NSString *composing_text;
 
#ifdef WITH_INPUT_IME
  struct {
    GHOST_ImeStateFlagCocoa state_flag;
    NSRect candidate_window_position;
 
    /* Event data. */
    GHOST_TEventImeData event;
    std::string combined_result;
  } ime;
#endif
}
 
@property(nonatomic, readonly, assign) GHOST_SystemCocoa *systemCocoa;
@property(nonatomic, readonly, assign) GHOST_WindowCocoa *windowCocoa;
 
- (instancetype)initWithSystemCocoa:(GHOST_SystemCocoa *)sysCocoa
                        windowCocoa:(GHOST_WindowCocoa *)winCocoa
                              frame:(NSRect)frameRect;
 
#ifdef WITH_INPUT_IME
- (void)beginIME:(int32_t)x y:(int32_t)y w:(int32_t)w h:(int32_t)h completed:(bool)completed;
 
- (void)endIME;
#endif
 
@end
 
@implementation COCOA_VIEW_CLASS
 
@synthesize systemCocoa = system_cocoa_;
@synthesize windowCocoa = window_cocoa_;
 
- (instancetype)initWithSystemCocoa:(GHOST_SystemCocoa *)sysCocoa
                        windowCocoa:(GHOST_WindowCocoa *)winCocoa
                              frame:(NSRect)frameRect
{
  self = [super init];
 
  if (self) {
    system_cocoa_ = sysCocoa;
    window_cocoa_ = winCocoa;
 
    composing = false;
    composing_text = nil;
 
#ifdef WITH_INPUT_IME
    ime.state_flag = 0;
    ime.candidate_window_position = NSZeroRect;
    ime.event.cursor_position = -1;
    ime.event.target_start = -1;
    ime.event.target_end = -1;
 
    /* Register a function to be executed when Input Method is changed using
     * "Control + Space" or language-specific keys (such as "EISU / KANA" key for Japanese). */
    @autoreleasepool {
      NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
      [center addObserver:self
                 selector:@selector(ImeDidChangeCallback:)
                     name:NSTextInputContextKeyboardSelectionDidChangeNotification
                   object:nil];
    }
#endif
  }
 
  return self;
}
 
- (BOOL)acceptsFirstResponder
{
  return YES;
}
 
- (BOOL)acceptsFirstMouse:(NSEvent *)event
{
  return YES;
}
 
// The trick to prevent Cocoa from complaining (beeping)
- (void)keyDown:(NSEvent *)event
{
#ifdef WITH_INPUT_IME
  [self checkKeyCodeIsControlChar:event];
  const bool ime_process = [self isProcessedByIme];
#else
  const bool ime_process = false;
#endif
 
  if (!ime_process) {
    system_cocoa_->handleKeyEvent(event);
  }
 
  /* Start or continue composing? */
  if ([[event characters] length] == 0 || [[event charactersIgnoringModifiers] length] == 0 ||
      composing || ime_process)
  {
    composing = YES;
 
    /* Interpret event to call insertText. */
    @autoreleasepool {
      [self interpretKeyEvents:[NSArray arrayWithObject:event]]; /* Calls insertText. */
    }
 
#ifdef WITH_INPUT_IME
    // For Korean input, control characters are also processed by handleKeyEvent.
    const int controlCharForKorean = (GHOST_IME_COMPOSITION_EVENT | GHOST_IME_RESULT_EVENT |
                                      GHOST_IME_KEY_CONTROL_CHAR);
    if (((ime.state_flag & controlCharForKorean) == controlCharForKorean)) {
      system_cocoa_->handleKeyEvent(event);
    }
 
    ime.state_flag &= ~(GHOST_IME_COMPOSITION_EVENT | GHOST_IME_RESULT_EVENT);
 
    ime.combined_result.clear();
#endif
 
    return;
  }
}
 
#define HANDLE_KEY_EVENT(eventType) \
  -(void)eventType : (NSEvent *)event \
  { \
    system_cocoa_->handleKeyEvent(event); \
  }
 
#define HANDLE_MOUSE_EVENT(eventType) \
  -(void)eventType : (NSEvent *)event \
  { \
    system_cocoa_->handleMouseEvent(event); \
  }
 
#define HANDLE_TABLET_EVENT(eventType) \
  -(void)eventType : (NSEvent *)event \
  { \
    system_cocoa_->handleMouseEvent(event); \
  }
 
HANDLE_KEY_EVENT(keyUp)
HANDLE_KEY_EVENT(flagsChanged)
 
HANDLE_MOUSE_EVENT(mouseDown)
HANDLE_MOUSE_EVENT(mouseUp)
HANDLE_MOUSE_EVENT(rightMouseDown)
HANDLE_MOUSE_EVENT(rightMouseUp)
HANDLE_MOUSE_EVENT(mouseMoved)
HANDLE_MOUSE_EVENT(mouseDragged)
HANDLE_MOUSE_EVENT(rightMouseDragged)
HANDLE_MOUSE_EVENT(scrollWheel)
HANDLE_MOUSE_EVENT(otherMouseDown)
HANDLE_MOUSE_EVENT(otherMouseUp)
HANDLE_MOUSE_EVENT(otherMouseDragged)
HANDLE_MOUSE_EVENT(magnifyWithEvent)
HANDLE_MOUSE_EVENT(smartMagnifyWithEvent)
HANDLE_MOUSE_EVENT(rotateWithEvent)
 
HANDLE_TABLET_EVENT(tabletPoint)
HANDLE_TABLET_EVENT(tabletProximity)
 
- (BOOL)isOpaque
{
  return YES;
}
 
- (void)drawRect:(NSRect)rect
{
  if ([self inLiveResize]) {
    /* Don't redraw while in live resize */
  }
  else {
    [super drawRect:rect];
    system_cocoa_->handleWindowEvent(GHOST_kEventWindowUpdate, window_cocoa_);
 
    /* For some cases like entering full-screen we need to redraw immediately
     * so our window does not show blank during the animation */
    if (window_cocoa_->getImmediateDraw()) {
      system_cocoa_->dispatchEvents();
    }
  }
}
 
/* Text input. */
 
- (void)composing_free
{
  composing = NO;
 
  if (composing_text) {
    [composing_text release];
    composing_text = nil;
  }
}
 
// Processes the Result String sent from the Input Method.
- (void)insertText:(id)chars replacementRange:(NSRange)replacementRange
{
  [self composing_free];
 
#ifdef WITH_INPUT_IME
  if (ime.state_flag & GHOST_IME_ENABLED) {
    if (!(ime.state_flag & GHOST_IME_COMPOSING)) {
      [self processImeEvent:GHOST_kEventImeCompositionStart];
    }
 
    /* For Chinese and Korean input, insertText may be executed twice with a single keyDown. */
    if (ime.state_flag & GHOST_IME_RESULT_EVENT) {
      ime.combined_result += [self convertNSString:chars];
    }
    else {
      ime.combined_result = [self convertNSString:chars];
    }
 
    [self setImeResult:ime.combined_result];
 
    /* For Korean input, both "Result Event" and "Composition Event"
     * can occur in a single keyDown. */
    if (![self ime_did_composition]) {
      [self processImeEvent:GHOST_kEventImeComposition];
    }
    ime.state_flag |= GHOST_IME_RESULT_EVENT;
 
    [self processImeEvent:GHOST_kEventImeCompositionEnd];
    ime.state_flag &= ~GHOST_IME_COMPOSING;
  }
#endif
}
 
/* Processes the Composition String sent from the Input Method. */
- (void)setMarkedText:(id)chars
        selectedRange:(NSRange)range
     replacementRange:(NSRange)replacementRange
{
  [self composing_free];
 
  if ([chars length] == 0) {
#ifdef WITH_INPUT_IME
    /* Processes when the last Composition String is deleted. */
    if (ime.state_flag & GHOST_IME_COMPOSING) {
      [self setImeResult:std::string()];
      [self processImeEvent:GHOST_kEventImeComposition];
      [self processImeEvent:GHOST_kEventImeCompositionEnd];
      ime.state_flag &= ~GHOST_IME_COMPOSING;
    }
#endif
 
    return;
  }
 
  /* Start composing. */
  composing = YES;
  composing_text = [chars copy];
 
  /* Chars of markedText by Input Method is an instance of NSAttributedString */
  if ([chars isKindOfClass:[NSAttributedString class]]) {
    composing_text = [[chars string] copy];
  }
 
  /* If empty, cancel. */
  if ([composing_text length] == 0) {
    [self composing_free];
  }
 
#ifdef WITH_INPUT_IME
  if (ime.state_flag & GHOST_IME_ENABLED) {
    if (!(ime.state_flag & GHOST_IME_COMPOSING)) {
      ime.state_flag |= GHOST_IME_COMPOSING;
      [self processImeEvent:GHOST_kEventImeCompositionStart];
    }
 
    [self setImeComposition:composing_text selectedRange:range];
 
    /* For Korean input, setMarkedText may be executed twice with a single keyDown. */
    if (![self ime_did_composition]) {
      ime.state_flag |= GHOST_IME_COMPOSITION_EVENT;
      [self processImeEvent:GHOST_kEventImeComposition];
    }
  }
#endif
}
 
- (void)unmarkText
{
  [self composing_free];
}
 
- (BOOL)hasMarkedText
{
  return (composing) ? YES : NO;
}
 
- (void)doCommandBySelector:(SEL)selector
{
}
 
- (BOOL)isComposing
{
  return composing;
}
 
- (NSAttributedString *)attributedSubstringForProposedRange:(NSRange)range
                                                actualRange:(NSRangePointer)actualRange
{
  return [[[NSAttributedString alloc] init] autorelease];
}
 
- (NSRange)markedRange
{
  unsigned int length = (composing_text) ? [composing_text length] : 0;
 
  if (composing) {
    return NSMakeRange(0, length);
  }
 
  return NSMakeRange(NSNotFound, 0);
}
 
- (NSRange)selectedRange
{
  unsigned int length = (composing_text) ? [composing_text length] : 0;
  return NSMakeRange(0, length);
}
 
// Specify the position where the Chinese and Japanese candidate windows are displayed.
- (NSRect)firstRectForCharacterRange:(NSRange)range actualRange:(NSRangePointer)actualRange
{
#ifdef WITH_INPUT_IME
  if (ime.state_flag & GHOST_IME_ENABLED) {
    return ime.candidate_window_position;
  }
#endif
  return NSZeroRect;
}
 
- (NSUInteger)characterIndexForPoint:(NSPoint)point
{
  return NSNotFound;
}
 
- (NSArray *)validAttributesForMarkedText
{
  return [NSArray array];
}
 
#ifdef WITH_INPUT_IME
- (void)checkImeEnabled
{
  ime.state_flag &= ~GHOST_IME_ENABLED;
 
  if (ime.state_flag & GHOST_IME_INPUT_FOCUSED) {
    /* Since there are no functions in Cocoa API,
     * we will use the functions in the Carbon API. */
    TISInputSourceRef currentKeyboardInputSource = TISCopyCurrentKeyboardInputSource();
    bool ime_enabled = !CFBooleanGetValue((CFBooleanRef)TISGetInputSourceProperty(
        currentKeyboardInputSource, kTISPropertyInputSourceIsASCIICapable));
    CFRelease(currentKeyboardInputSource);
 
    if (ime_enabled) {
      ime.state_flag |= GHOST_IME_ENABLED;
      return;
    }
  }
  return;
}
 
- (void)ImeDidChangeCallback:(NSNotification *)notification
{
  [self checkImeEnabled];
}
 
- (void)setImeCandidateWinPos:(int32_t)x y:(int32_t)y w:(int32_t)w h:(int32_t)h
{
  int32_t outX, outY;
  window_cocoa_->clientToScreen(x, y, outX, outY);
  ime.candidate_window_position = NSMakeRect((CGFloat)outX, (CGFloat)outY, (CGFloat)w, (CGFloat)h);
}
 
- (void)beginIME:(int32_t)x y:(int32_t)y w:(int32_t)w h:(int32_t)h completed:(bool)completed
{
  ime.state_flag |= GHOST_IME_INPUT_FOCUSED;
  [self checkImeEnabled];
  [self setImeCandidateWinPos:x y:y w:w h:h];
}
 
- (void)endIME
{
  ime.state_flag = 0;
  ime.event.result.clear();
  ime.event.composite.clear();
 
  [self unmarkText];
  @autoreleasepool {
    [[NSTextInputContext currentInputContext] discardMarkedText];
  }
}
 
- (void)processImeEvent:(GHOST_TEventType)imeEventType
{
  GHOST_Event *event = new GHOST_EventIME(
      system_cocoa_->getMilliSeconds(), imeEventType, window_cocoa_, &ime.event);
  system_cocoa_->pushEvent(event);
}
 
- (std::string)convertNSString:(NSString *)inString
{
  @autoreleasepool {
    std::string str(inString.UTF8String);
    return str;
  }
}
 
- (void)setImeComposition:(NSString *)inString selectedRange:(NSRange)range
{
  ime.event.composite = [self convertNSString:inString];
 
  /* For Korean input, both "Result Event" and "Composition Event" can occur in a single keyDown.
   */
  if (!(ime.state_flag & GHOST_IME_RESULT_EVENT)) {
    ime.event.result.clear();
  }
 
  /* The target string is equivalent to the string in selectedRange of setMarkedText.
   * The cursor is displayed at the beginning of the target string. */
  @autoreleasepool {
    char *front_string = (char *)[[inString substringWithRange:NSMakeRange(0, range.location)]
        UTF8String];
    char *selected_string = (char *)[[inString substringWithRange:range] UTF8String];
    ime.event.cursor_position = strlen(front_string);
    ime.event.target_start = ime.event.cursor_position;
    ime.event.target_end = ime.event.target_start + strlen(selected_string);
  }
}
 
- (void)setImeResult:(std::string)result
{
  ime.event.result = result;
  ime.event.composite.clear();
  ime.event.cursor_position = -1;
  ime.event.target_start = -1;
  ime.event.target_end = -1;
}
 
- (void)checkKeyCodeIsControlChar:(NSEvent *)event
{
  ime.state_flag &= ~GHOST_IME_KEY_CONTROL_CHAR;
 
  /* Don't use IME for command and ctrl key combinations, these are shortcuts. */
  if (event.modifierFlags & (NSEventModifierFlagCommand | NSEventModifierFlagControl)) {
    ime.state_flag |= GHOST_IME_KEY_CONTROL_CHAR;
    return;
  }
 
  /* Don't use IME for these control keys. */
  switch (event.keyCode) {
    case kVK_ANSI_KeypadEnter:
    case kVK_ANSI_KeypadClear:
    case kVK_F1:
    case kVK_F2:
    case kVK_F3:
    case kVK_F4:
    case kVK_F5:
    case kVK_F6:
    case kVK_F7:
    case kVK_F8:
    case kVK_F9:
    case kVK_F10:
    case kVK_F11:
    case kVK_F12:
    case kVK_F13:
    case kVK_F14:
    case kVK_F15:
    case kVK_F16:
    case kVK_F17:
    case kVK_F18:
    case kVK_F19:
    case kVK_F20:
    case kVK_UpArrow:
    case kVK_DownArrow:
    case kVK_LeftArrow:
    case kVK_RightArrow:
    case kVK_Return:
    case kVK_Delete:
    case kVK_ForwardDelete:
    case kVK_Escape:
    case kVK_Tab:
    case kVK_Home:
    case kVK_End:
    case kVK_PageUp:
    case kVK_PageDown:
    case kVK_VolumeUp:
    case kVK_VolumeDown:
    case kVK_Mute:
      ime.state_flag |= GHOST_IME_KEY_CONTROL_CHAR;
      return;
  }
}
 
- (bool)ime_did_composition
{
  return (ime.state_flag & GHOST_IME_COMPOSITION_EVENT) ||
         (ime.state_flag & GHOST_IME_RESULT_EVENT);
}
 
/* Even if IME is enabled, when not composing, control characters
 * (such as arrow, enter, delete) are handled by handleKeyEvent. */
- (bool)isProcessedByIme
{
  return (
      (ime.state_flag & GHOST_IME_ENABLED) &&
      ((ime.state_flag & GHOST_IME_COMPOSING) || !(ime.state_flag & GHOST_IME_KEY_CONTROL_CHAR)));
}
#endif /* WITH_INPUT_IME */
 
@end