JUCE/modules/juce_gui_basics/native/juce_mac_MouseCursor.mm

/*
  ==============================================================================

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

#if JUCE_MAC

//==============================================================================
namespace MouseCursorHelpers
{
    static NSCursor* fromNSImage (NSImage* im, NSPoint hotspot)
    {
        NSCursor* c = [[NSCursor alloc] initWithImage: im
                                              hotSpot: hotspot];
        [im release];
        return c;
    }

    static void* fromHIServices (const char* filename)
    {
        JUCE_AUTORELEASEPOOL
        {
            auto cursorPath = String ("/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/"
                                      "HIServices.framework/Versions/A/Resources/cursors/")
                                  + filename;

            NSImage* originalImage = [[NSImage alloc] initByReferencingFile: juceStringToNS (cursorPath + "/cursor.pdf")];
            NSSize originalSize = [originalImage size];
            NSImage* resultImage   = [[NSImage alloc] initWithSize: originalSize];

            for (int scale = 1; scale <= 4; ++scale)
            {
                NSAffineTransform* scaleTransform = [NSAffineTransform transform];
                [scaleTransform scaleBy: (float) scale];

                if (CGImageRef rasterCGImage = [originalImage CGImageForProposedRect: nil
                                                                             context: nil
                                                                               hints: [NSDictionary dictionaryWithObjectsAndKeys:
                                                                                         NSImageHintCTM, scaleTransform, nil]])
                {
                    NSBitmapImageRep* imageRep = [[NSBitmapImageRep alloc] initWithCGImage: rasterCGImage];
                    [imageRep setSize: originalSize];

                    [resultImage addRepresentation: imageRep];
                    [imageRep release];
                }
                else
                {
                    return nil;
                }
            }

            [originalImage release];

            NSDictionary* info = [NSDictionary dictionaryWithContentsOfFile: juceStringToNS (cursorPath + "/info.plist")];

            auto hotspotX = (float) [[info valueForKey: nsStringLiteral ("hotx")] doubleValue];
            auto hotspotY = (float) [[info valueForKey: nsStringLiteral ("hoty")] doubleValue];

            return fromNSImage (resultImage, NSMakePoint (hotspotX, hotspotY));
        }
    }
}

void* CustomMouseCursorInfo::create() const
{
    return MouseCursorHelpers::fromNSImage (imageToNSImage (image, scaleFactor),
                                            NSMakePoint (hotspot.x, hotspot.y));
}

void* MouseCursor::createStandardMouseCursor (MouseCursor::StandardCursorType type)
{
    JUCE_AUTORELEASEPOOL
    {
        NSCursor* c = nil;

        switch (type)
        {
            case NormalCursor:
            case ParentCursor:          c = [NSCursor arrowCursor]; break;
            case NoCursor:              return CustomMouseCursorInfo (Image (Image::ARGB, 8, 8, true), {}).create();
            case DraggingHandCursor:    c = [NSCursor openHandCursor]; break;
            case WaitCursor:            c = [NSCursor arrowCursor]; break; // avoid this on the mac, let the OS provide the beachball
            case IBeamCursor:           c = [NSCursor IBeamCursor]; break;
            case PointingHandCursor:    c = [NSCursor pointingHandCursor]; break;
            case LeftEdgeResizeCursor:  c = [NSCursor resizeLeftCursor]; break;
            case RightEdgeResizeCursor: c = [NSCursor resizeRightCursor]; break;
            case CrosshairCursor:       c = [NSCursor crosshairCursor]; break;

            case CopyingCursor:
            {
                c = [NSCursor dragCopyCursor];
                break;
            }

            case UpDownResizeCursor:
            case TopEdgeResizeCursor:
            case BottomEdgeResizeCursor:
                if (void* m = MouseCursorHelpers::fromHIServices ("resizenorthsouth"))
                    return m;

                c = [NSCursor resizeUpDownCursor];
                break;

            case LeftRightResizeCursor:
                if (void* m = MouseCursorHelpers::fromHIServices ("resizeeastwest"))
                    return m;

                c = [NSCursor resizeLeftRightCursor];
                break;

            case TopLeftCornerResizeCursor:
            case BottomRightCornerResizeCursor:
                return MouseCursorHelpers::fromHIServices ("resizenorthwestsoutheast");

            case TopRightCornerResizeCursor:
            case BottomLeftCornerResizeCursor:
                return MouseCursorHelpers::fromHIServices ("resizenortheastsouthwest");

            case UpDownLeftRightResizeCursor:
                return MouseCursorHelpers::fromHIServices ("move");

            case NumStandardCursorTypes:
            default:
                jassertfalse;
                break;
        }

        [c retain];
        return c;
    }
}

void MouseCursor::deleteMouseCursor (void* const cursorHandle, const bool /*isStandard*/)
{
    [((NSCursor*) cursorHandle) release];
}

void MouseCursor::showInWindow (ComponentPeer*) const
{
    auto c = (NSCursor*) getHandle();

    if (c == nil)
        c = [NSCursor arrowCursor];

    [c set];
}

#else

void* CustomMouseCursorInfo::create() const                                              { return nullptr; }
void* MouseCursor::createStandardMouseCursor (MouseCursor::StandardCursorType)           { return nullptr; }
void MouseCursor::deleteMouseCursor (void*, bool)                                        {}
void MouseCursor::showInWindow (ComponentPeer*) const                                    {}

#endif

} // namespace juce