andlabs-ui/redo/controls_unix.go

// +build !windows,!darwin

// 7 july 2014

package ui

import (
	"unsafe"
)

// #include "gtk_unix.h"
// extern void buttonClicked(GtkButton *, gpointer);
import "C"

type widgetbase struct {
	widget	*C.GtkWidget
	parentw	*window
	floating	bool
}

func newWidget(w *C.GtkWidget) *widgetbase {
	return &widgetbase{
		widget:	w,
	}
}

// these few methods are embedded by all the various Controls since they all will do the same thing

func (w *widgetbase) unparent() {
	if w.parentw != nil {
		// add another reference so it doesn't get removed by accident
		C.g_object_ref(C.gpointer(unsafe.Pointer(w.widget)))
		// we unref this in parent() below
		w.floating = true
		C.gtk_container_remove(w.parentw.layoutc, w.widget)
		w.parentw = nil
	}
}

func (w *widgetbase) parent(win *window) {
	C.gtk_container_add(win.layoutc, w.widget)
	w.parentw = win
	// was previously parented; unref our saved ref
	if w.floating {
		C.g_object_unref(C.gpointer(unsafe.Pointer(w.widget)))
		w.floating = false
	}
}

type button struct {
	*widgetbase
	button		*C.GtkButton
	clicked		*event
}

func newButton(text string) *button {
	ctext := togstr(text)
	defer freegstr(ctext)
	widget := C.gtk_button_new_with_label(ctext)
	b := &button{
		widgetbase:	newWidget(widget),
		button:		(*C.GtkButton)(unsafe.Pointer(widget)),
		clicked:		newEvent(),
	}
	g_signal_connect(
		C.gpointer(unsafe.Pointer(b.button)),
		"clicked",
		C.GCallback(C.buttonClicked),
		C.gpointer(unsafe.Pointer(b)))
	return b
}

func (b *button) OnClicked(e func()) {
	b.clicked.set(e)
}

//export buttonClicked
func buttonClicked(bwid *C.GtkButton, data C.gpointer) {
	b := (*button)(unsafe.Pointer(data))
	b.clicked.fire()
	println("button clicked")
}

func (b *button) Text() string {
	return fromgstr(C.gtk_button_get_label(b.button))
}

func (b *button) SetText(text string) {
	ctext := togstr(text)
	defer freegstr(ctext)
	C.gtk_button_set_label(b.button, ctext)
}