// Package gtk was automatically generated by github.com/bnema/puregotk DO NOT EDIT
package gtk

import (
	"structs"
	"unsafe"

	"github.com/ebitengine/purego"

	"github.com/bnema/puregotk/pkg/core"
	"github.com/bnema/puregotk/v4/glib"
	"github.com/bnema/puregotk/v4/gobject"
	"github.com/bnema/puregotk/v4/gobject/types"
)

type GestureZoomClass struct {
	_ structs.HostLayout
}

func (x *GestureZoomClass) GoPointer() uintptr {
	return uintptr(unsafe.Pointer(x))
}

// Recognizes 2-finger pinch/zoom gestures.
//
// Whenever the distance between both tracked sequences changes, the
// [signal@Gtk.GestureZoom::scale-changed] signal is emitted to report
// the scale factor.
type GestureZoom struct {
	Gesture
}

var xGestureZoomGLibType func() types.GType

func GestureZoomGLibType() types.GType {
	return xGestureZoomGLibType()
}

func GestureZoomNewFromInternalPtr(ptr uintptr) *GestureZoom {
	cls := &GestureZoom{}
	cls.Ptr = ptr
	return cls
}

var xNewGestureZoom func() uintptr

// Returns a newly created `GtkGesture` that recognizes
// pinch/zoom gestures.
func NewGestureZoom() *GestureZoom {
	var cls *GestureZoom

	cret := xNewGestureZoom()

	if cret == 0 {
		return nil
	}
	cls = &GestureZoom{}
	cls.Ptr = cret
	return cls
}

var xGestureZoomGetScaleDelta func(uintptr) float64

// Gets the scale delta.
//
// If @gesture is active, this function returns the zooming
// difference since the gesture was recognized (hence the
// starting point is considered 1:1). If @gesture is not
// active, 1 is returned.
func (x *GestureZoom) GetScaleDelta() float64 {

	cret := xGestureZoomGetScaleDelta(x.GoPointer())
	return cret
}

func (c *GestureZoom) GoPointer() uintptr {
	if c == nil {
		return 0
	}
	return c.Ptr
}

func (c *GestureZoom) SetGoPointer(ptr uintptr) {
	c.Ptr = ptr
}

// Emitted whenever the distance between both tracked sequences changes.
func (x *GestureZoom) ConnectScaleChanged(cb *func(GestureZoom, float64)) uint {
	cbPtr := uintptr(unsafe.Pointer(cb))
	if cbRefPtr, ok := glib.GetCallback(cbPtr); ok {
		handlerID := gobject.SignalConnect(x.GoPointer(), "scale-changed", cbRefPtr)
		glib.SaveHandlerMapping(handlerID, cbPtr)
		return handlerID
	}

	fcb := func(clsPtr uintptr, ScaleVarp float64) {
		fa := GestureZoom{}
		fa.Ptr = clsPtr
		cbFn := *cb

		cbFn(fa, ScaleVarp)

	}
	cbRefPtr := purego.NewCallback(fcb)
	glib.SaveCallbackWithClosure(cbPtr, cbRefPtr, cb)
	handlerID := gobject.SignalConnect(x.GoPointer(), "scale-changed", cbRefPtr)
	glib.SaveHandlerMapping(handlerID, cbPtr)
	return handlerID
}

func init() {
	core.SetPackageName("GTK", "gtk4")
	core.SetSharedLibraries("GTK", []string{"libgtk-4.so.1"})
	var libs []uintptr
	for _, libPath := range core.GetPaths("GTK") {
		lib, err := purego.Dlopen(libPath, purego.RTLD_NOW|purego.RTLD_GLOBAL)
		if err != nil {
			panic(err)
		}
		libs = append(libs, lib)
	}

	core.PuregoSafeRegister(&xGestureZoomGLibType, libs, "gtk_gesture_zoom_get_type")

	core.PuregoSafeRegister(&xNewGestureZoom, libs, "gtk_gesture_zoom_new")

	core.PuregoSafeRegister(&xGestureZoomGetScaleDelta, libs, "gtk_gesture_zoom_get_scale_delta")

}