Implemented uiButton on GTK+. All we need to do is get it to show up...

new/button_unix.c

@@ -0,0 +1,56 @@
+// 7 april 2015
+#include "uipriv_unix.h"
+
+struct button {
+	uiControl *c;
+	void (*onClicked)(uiControl *, void *);
+	void *onClickedData;
+};
+
+#define B(x) ((struct button *) (x))
+
+static void onClicked(GtkButton *b, gpointer data)
+{
+	(*(B(data)->onClicked))(B(data)->c, B(data)->onClickedData);
+}
+
+static void defaultOnClicked(uiControl *c, void *data)
+{
+	// do nothing
+}
+
+// TODO destruction
+uiControl *uiNewButton(const char *text)
+{
+	struct button *b;
+	GParameter props[1];
+	GtkWidget *widget;
+
+	b = g_new0(struct button, 1);
+
+	props[0].name = "label";
+	g_value_init(&(props[0].value), G_TYPE_STRING);
+	g_value_set_string(&(props[0].value), text);
+	b->c = uiUnixNewControl(GTK_TYPE_BUTTON,
+		1, props,
+		FALSE, FALSE, FALSE, b);
+	g_value_unset(&(props[0].value));		// thanks to gregier in irc.gimp.net/#gtk+
+
+	widget = GTK_WIDGET(uiControlHandle(b->c));
+	g_signal_connect(widget, "clicked", G_CALLBACK(onClicked), b);
+
+	b->onClicked = defaultOnClicked;
+
+	return b->c;
+}
+
+// TODO text
+
+void uiButtonOnClicked(uiControl *c, void (*f)(uiControl *, void *), void *data)
+{
+	struct button *b;
+
+	b = (struct button *) uiUnixControlData(c);
+	b->onClicked = f;
+	b->onClickedData = data;
+}

new/button_windows.c

@@ -33,6 +33,7 @@ static void defaultOnClicked(uiControl *c, void *data)
 	// do nothing
 }
 
+// TODO destruction
 uiControl *uiNewButton(const char *text)
 {
 	struct button *b;

new/container_unix.c

@@ -39,6 +39,7 @@ static void uiContainer_size_allocate(GtkWidget *widget, GtkAllocation *allocati
 
 	gtk_widget_set_allocation(widget, allocation);
 	c = uiContainer(widget)->child;
+	if (c != NULL)
 		(*(c->resize))(c, allocation->x, allocation->y, allocation->width, allocation->height, &d);
 }