WindowController.mm

/*
 Copyright (C) 2015 Apple Inc. All Rights Reserved.
 See LICENSE.txt for this sample’s licensing information
 
 Abstract:
 Window controller subclass.
 */

#import "WindowController.h"
#import "FullscreenWindow.h"
#import "ViewBase.h"

@interface WindowController ()

// Fullscreen window
@property(strong) FullscreenWindow *fullscreenWindow;

// Non-Fullscreen window (also the initial window)
@property(strong) NSWindow* standardWindow;

@end

@implementation WindowController
{
    bool CommandKeyPressed;
}

- (instancetype)initWithWindow:(NSWindow *)window
{
    self = [super initWithWindow:window];

    if (self)
    {
        // Initialize to nil since it indicates app is not fullscreen
        _fullscreenWindow = nil;
    }

    CommandKeyPressed = false;

    return self;
}

- (void)windowDidLoad
{
    [super windowDidLoad];

    NSWindow* window = self.window;

    // Force dark appearance to match the application UI
    window.appearance = [NSAppearance appearanceNamed:NSAppearanceNameDarkAqua];

    // Make the titlebar transparent so it blends with the window background
    window.titlebarAppearsTransparent = YES;

    // Set window background color matching ImGuiColors::TitleBg (~0.07, 0.08, 0.11)
    window.backgroundColor = [NSColor colorWithRed:0.07 green:0.08 blue:0.11 alpha:1.0];

    // Hide the title text (the app name is shown in the content area)
    window.titleVisibility = NSWindowTitleHidden;
}

- (void) goFullscreen
{
    // If app is already fullscreen...
    if([self fullscreenWindow])
    {
        //...don't do anything
        return;
    }

    ViewBase* view = (ViewBase*)self.window.contentView;

    // We must stop the display link while
    // switching the windows to make sure
    // that render commands are not issued
    // from another thread
    [view stopDisplayLink];

    // Allocate a new fullscreen window
    [self setFullscreenWindow: [[FullscreenWindow alloc] init]];

    [[self fullscreenWindow] setAcceptsMouseMovedEvents:YES];

    // Resize the view to screensize
    NSRect viewRect = [[self fullscreenWindow] frame];

    // Set the view to the size of the fullscreen window
    [self.window.contentView setFrameSize: viewRect.size];

    // Set the view in the fullscreen window
    [[self fullscreenWindow] setContentView:self.window.contentView];

    [self setStandardWindow:[self window]];

    // Hide non-fullscreen window so it doesn't show up when switching out
    // of this app (i.e. with CMD-TAB)
    [[self standardWindow] orderOut:self];

    // Set controller to the fullscreen window so that all input will go to
    // this controller (self)
    [self setWindow:[self fullscreenWindow]];

    // Show the window and make it the key window for input
    [[self fullscreenWindow] makeKeyAndOrderFront:self];

    // Restore display link
    [view startDisplayLink];
}

- (void) goWindow
{
    // If controller doesn't have a full screen window...
    if([self fullscreenWindow] == nil)
    {
        //...app is already windowed so don't do anything
        return;
    }

    ViewBase* view = (ViewBase*)self.window.contentView;

    // We must stop the display link while
    // switching the windows to make sure
    // that render commands are not issued
    // from another thread
    [view stopDisplayLink];

    // Get the rectangle of the original window
    NSRect viewRect = [[self standardWindow] frame];
    
    // Set the view rect to the new size
    [self.window.contentView setFrame:viewRect];

    // Hide fullscreen window
    [[self fullscreenWindow] orderOut:self];

    // Set controller to the standard window so that all input will go to
    // this controller (self)
    [self setWindow:[self standardWindow]];

    // Set the content of the original window to the view
    [[self window] setContentView: [self fullscreenWindow].contentView];

    // Show the window and make it the key window for input
    [[self window] makeKeyAndOrderFront:self];

    // Ensure we set fullscreen Window to nil so our checks for 
    // windowed vs. fullscreen mode elsewhere are correct
    [self setFullscreenWindow: nil];

    // Restore display link
    [view startDisplayLink];
}


- (void) keyDown:(NSEvent *)event
{
    unichar c = [[event charactersIgnoringModifiers] characterAtIndex:0];

    switch (c)
    {
        // Handle [ESC] key
        case 27:
            if([self fullscreenWindow] != nil)
            {
                [self goWindow];
            }
            return;

        // Have Command+f or Command+Enter toggle fullscreen
        case 13:
        case 'f':
            if (CommandKeyPressed)
            {
                if([self fullscreenWindow] == nil)
                {
                    [self goFullscreen];
                }
                else
                {
                    [self goWindow];
                }
            }
            return;
    }

    // Allow other character to be handled (or not and beep)
    //[super keyDown:event];
}

// Informs the receiver that the user has pressed or released a
// modifier key (Shift, Control, and so on)
- (void)flagsChanged:(NSEvent *)event
{
    auto modifierFlags = [event modifierFlags];
    CommandKeyPressed = modifierFlags & NSEventModifierFlagCommand;

    [super flagsChanged:event];
}

@end