Add Stepper (#5)

README.md

@@ -6,6 +6,7 @@
 >
 > #### Changes to original
 >
+> - 2024-05-22 [#5](https://github.com/roblillack/gocoa/pull/5): Add NSStepper
 > - 2024-05-22 [#4](https://github.com/roblillack/gocoa/pull/4): Add text alignment options to textfields
 > - 2024-05-22 [#3](https://github.com/roblillack/gocoa/pull/3): Add support for `OnChange` callbacks for textfields
 > - 2024-05-22 [#1](https://github.com/roblillack/gocoa/pull/1): Add support for removing controls (based on work by @phaus)

stepper.go

@@ -0,0 +1,77 @@
+package gocoa
+
+// #cgo CFLAGS: -x objective-c
+// #cgo LDFLAGS: -framework Cocoa
+// #import "stepper.h"
+import "C"
+
+type Stepper struct {
+	ptr C.StepperPtr
+	id  int
+	cb  func(value float64)
+}
+
+var steppers []*Stepper
+
+//export onStepperValueChanged
+func onStepperValueChanged(id C.int) {
+	stepper := getStepper(id)
+	if stepper != nil && stepper.cb != nil {
+		stepper.cb(stepper.Value())
+	}
+}
+
+func getStepper(id C.int) *Stepper {
+	stepperID := int(id)
+	if stepperID < len(steppers) {
+		return steppers[stepperID]
+	}
+
+	return nil
+}
+
+func NewStepper(x int, y int, width int, height int) *Stepper {
+	stepperID := len(steppers)
+	stepperPtr := C.Stepper_New(C.int(stepperID), C.int(x), C.int(y), C.int(width), C.int(height))
+
+	stepper := &Stepper{
+		ptr: stepperPtr,
+		id:  stepperID,
+	}
+	steppers = append(steppers, stepper)
+	return stepper
+}
+
+func (stepper *Stepper) SetMaxValue(val float64) {
+	C.Stepper_SetMaxValue(stepper.ptr, C.double(val))
+}
+
+func (stepper *Stepper) SetMinValue(val float64) {
+	C.Stepper_SetMinValue(stepper.ptr, C.double(val))
+}
+
+func (stepper *Stepper) SetIncrement(val float64) {
+	C.Stepper_SetIncrement(stepper.ptr, C.double(val))
+}
+
+func (stepper *Stepper) SetValue(val float64) {
+	C.Stepper_SetValue(stepper.ptr, C.double(val))
+}
+
+func (stepper *Stepper) SetValueWraps(val bool) {
+	C.Stepper_SetValueWraps(stepper.ptr, C.bool(val))
+}
+
+func (stepper *Stepper) Value() float64 {
+	return float64(C.Stepper_Value(stepper.ptr))
+}
+
+func (stepper *Stepper) OnStepperValueChanged(fn func(value float64)) {
+	stepper.cb = fn
+}
+
+// Remove removes a Slider from the parent view again.
+func (stepper *Stepper) Remove() {
+	C.Stepper_Remove(stepper.ptr)
+	steppers[stepper.id] = nil
+}

stepper.h

@@ -0,0 +1,20 @@
+#import <Cocoa/Cocoa.h>
+
+@interface StepperHandler : NSObject
+
+@property(assign) int goStepperId;
+- (void)stepperValueChanged:(id)sender;
+
+@end
+
+typedef void *StepperPtr;
+
+StepperPtr Stepper_New(int goStepperId, int x, int y, int w, int h);
+void Stepper_SetMaxValue(StepperPtr StepperPtr, double val);
+void Stepper_SetMinValue(StepperPtr StepperPtr, double val);
+void Stepper_SetIncrement(StepperPtr StepperPtr, double val);
+void Stepper_SetValue(StepperPtr StepperPtr, double val);
+double Stepper_Value(StepperPtr StepperPtr);
+void Stepper_Remove(StepperPtr StepperPtr);
+bool Stepper_ValueWraps(StepperPtr StepperPtr);
+void Stepper_SetValueWraps(StepperPtr StepperPtr, bool wraps);

stepper.m

@@ -0,0 +1,61 @@
+#import "stepper.h"
+#include "_cgo_export.h"
+
+@implementation StepperHandler
+- (void)stepperValueChanged:(id)sender {
+  onStepperValueChanged([self goStepperId]);
+}
+@end
+
+StepperPtr Stepper_New(int goStepperId, int x, int y, int w, int h) {
+  id nsStepper =
+      [[[NSStepper alloc] initWithFrame:NSMakeRect(x, y, w, h)] autorelease];
+
+  StepperHandler *handler = [[StepperHandler alloc] init];
+  [handler setGoStepperId:goStepperId];
+  [handler autorelease];
+  [nsStepper setTarget:handler];
+  [nsStepper setAction:@selector(stepperValueChanged:)];
+
+  return (StepperPtr)nsStepper;
+}
+
+void Stepper_SetMaxValue(StepperPtr StepperPtr, double val) {
+  NSStepper *stepper = (NSStepper *)StepperPtr;
+  [stepper setMaxValue:val];
+}
+
+void Stepper_SetMinValue(StepperPtr StepperPtr, double val) {
+  NSStepper *stepper = (NSStepper *)StepperPtr;
+  [stepper setMinValue:val];
+}
+
+void Stepper_SetIncrement(StepperPtr StepperPtr, double val) {
+  NSStepper *stepper = (NSStepper *)StepperPtr;
+  [stepper setIncrement:val];
+}
+
+void Stepper_SetValue(StepperPtr StepperPtr, double val) {
+  NSStepper *stepper = (NSStepper *)StepperPtr;
+  [stepper setDoubleValue:val];
+}
+
+bool Stepper_ValueWraps(StepperPtr StepperPtr) {
+  NSStepper *stepper = (NSStepper *)StepperPtr;
+  return stepper.valueWraps;
+}
+
+void Stepper_SetValueWraps(StepperPtr StepperPtr, bool wraps) {
+  NSStepper *stepper = (NSStepper *)StepperPtr;
+  [stepper setValueWraps:wraps];
+}
+
+double Stepper_Value(StepperPtr StepperPtr) {
+  NSStepper *stepper = (NSStepper *)StepperPtr;
+  return stepper.doubleValue;
+}
+
+void Stepper_Remove(StepperPtr StepperPtr) {
+  NSStepper *stepper = (NSStepper *)StepperPtr;
+  [stepper removeFromSuperview];
+}

window.go

@@ -126,6 +126,10 @@ func (wnd *Window) AddSlider(slider *Slider) {
 	C.Window_AddSlider(wnd.winPtr, slider.sliderPtr)
 }
 
+func (wnd *Window) AddStepper(stepper *Stepper) {
+	C.Window_AddStepper(wnd.winPtr, stepper.ptr)
+}
+
 func (wnd *Window) AddComboBox(comboBox *ComboBox) {
 	C.Window_AddComboBox(wnd.winPtr, comboBox.comboBoxPtr)
 }

window.h

@@ -8,6 +8,7 @@
 #include "textfield.h"
 #include "progressIndicator.h"
 #include "slider.h"
+#include "stepper.h"
 
 void* Window_New(int goWindowID, int x, int y, int width, int height, const char* title);
 void* Centered_Window_New(int goWindowID, int width, int height, const char* title);
@@ -23,6 +24,7 @@ void Window_AddTextField(void *wndPtr, TextFieldPtr tfPtr);
 void Window_AddProgressIndicator(void *wndPtr, ProgressIndicatorPtr progressIndicatorPtr);
 void Window_AddImageView(void *wndPtr, ImageViewPtr imageViewPtr);
 void Window_AddSlider(void *wndPtr, SliderPtr sliderPtr);
+void Window_AddStepper(void *wndPtr, StepperPtr ptr);
 void Window_AddComboBox(void *wndPtr, ComboBoxPtr comboBoxPtr);
 void Window_Update(void *wndPtr);
 void Window_SetTitle(void *wndPtr, const char* title);

window.m

@@ -125,6 +125,13 @@ void Window_AddSlider(void *wndPtr, SliderPtr sliderPtr)
     [[window contentView] addSubview:slider];
 }
 
+void Window_AddStepper(void *wndPtr, StepperPtr ptr)
+{
+    NSStepper* stepper = (NSStepper*)ptr;
+    NSWindow* window = (NSWindow*)wndPtr;
+    [[window contentView] addSubview:stepper];
+}
+
 void Window_AddComboBox(void *wndPtr, ComboBoxPtr comboBoxPtr)
 {
     NSComboBox* comboBox = (NSComboBox*)comboBoxPtr;